| //===-- EmulateInstructionARM.cpp -------------------------------*- C++ -*-===// |
| // |
| // The LLVM Compiler Infrastructure |
| // |
| // This file is distributed under the University of Illinois Open Source |
| // License. See LICENSE.TXT for details. |
| // |
| //===----------------------------------------------------------------------===// |
| |
| #include <stdlib.h> |
| |
| #include "EmulateInstructionARM.h" |
| #include "lldb/Core/ArchSpec.h" |
| #include "lldb/Core/ConstString.h" |
| |
| #include "Plugins/Process/Utility/ARMDefines.h" |
| #include "Plugins/Process/Utility/ARMUtils.h" |
| #include "Utility/ARM_DWARF_Registers.h" |
| |
| #include "llvm/Support/MathExtras.h" // for SignExtend32 template function |
| // and CountTrailingZeros_32 function |
| |
| using namespace lldb; |
| using namespace lldb_private; |
| |
| // Convenient macro definitions. |
| #define APSR_C Bit32(m_inst_cpsr, CPSR_C) |
| #define APSR_V Bit32(m_inst_cpsr, CPSR_V) |
| |
| #define AlignPC(pc_val) (pc_val & 0xFFFFFFFC) |
| |
| //---------------------------------------------------------------------- |
| // |
| // ITSession implementation |
| // |
| //---------------------------------------------------------------------- |
| |
| // A8.6.50 |
| // Valid return values are {1, 2, 3, 4}, with 0 signifying an error condition. |
| static unsigned short CountITSize(unsigned ITMask) { |
| // First count the trailing zeros of the IT mask. |
| unsigned TZ = llvm::CountTrailingZeros_32(ITMask); |
| if (TZ > 3) |
| { |
| printf("Encoding error: IT Mask '0000'\n"); |
| return 0; |
| } |
| return (4 - TZ); |
| } |
| |
| // Init ITState. Note that at least one bit is always 1 in mask. |
| bool ITSession::InitIT(unsigned short bits7_0) |
| { |
| ITCounter = CountITSize(Bits32(bits7_0, 3, 0)); |
| if (ITCounter == 0) |
| return false; |
| |
| // A8.6.50 IT |
| unsigned short FirstCond = Bits32(bits7_0, 7, 4); |
| if (FirstCond == 0xF) |
| { |
| printf("Encoding error: IT FirstCond '1111'\n"); |
| return false; |
| } |
| if (FirstCond == 0xE && ITCounter != 1) |
| { |
| printf("Encoding error: IT FirstCond '1110' && Mask != '1000'\n"); |
| return false; |
| } |
| |
| ITState = bits7_0; |
| return true; |
| } |
| |
| // Update ITState if necessary. |
| void ITSession::ITAdvance() |
| { |
| assert(ITCounter); |
| --ITCounter; |
| if (ITCounter == 0) |
| ITState = 0; |
| else |
| { |
| unsigned short NewITState4_0 = Bits32(ITState, 4, 0) << 1; |
| SetBits32(ITState, 4, 0, NewITState4_0); |
| } |
| } |
| |
| // Return true if we're inside an IT Block. |
| bool ITSession::InITBlock() |
| { |
| return ITCounter != 0; |
| } |
| |
| // Return true if we're the last instruction inside an IT Block. |
| bool ITSession::LastInITBlock() |
| { |
| return ITCounter == 1; |
| } |
| |
| // Get condition bits for the current thumb instruction. |
| uint32_t ITSession::GetCond() |
| { |
| if (InITBlock()) |
| return Bits32(ITState, 7, 4); |
| else |
| return COND_AL; |
| } |
| |
| // ARM constants used during decoding |
| #define REG_RD 0 |
| #define LDM_REGLIST 1 |
| #define SP_REG 13 |
| #define LR_REG 14 |
| #define PC_REG 15 |
| #define PC_REGLIST_BIT 0x8000 |
| |
| #define ARMv4 (1u << 0) |
| #define ARMv4T (1u << 1) |
| #define ARMv5T (1u << 2) |
| #define ARMv5TE (1u << 3) |
| #define ARMv5TEJ (1u << 4) |
| #define ARMv6 (1u << 5) |
| #define ARMv6K (1u << 6) |
| #define ARMv6T2 (1u << 7) |
| #define ARMv7 (1u << 8) |
| #define ARMv8 (1u << 9) |
| #define ARMvAll (0xffffffffu) |
| |
| #define ARMV4T_ABOVE (ARMv4T|ARMv5T|ARMv5TE|ARMv5TEJ|ARMv6|ARMv6K|ARMv6T2|ARMv7|ARMv8) |
| #define ARMV5_ABOVE (ARMv5T|ARMv5TE|ARMv5TEJ|ARMv6|ARMv6K|ARMv6T2|ARMv7|ARMv8) |
| #define ARMV6T2_ABOVE (ARMv6T2|ARMv7|ARMv8) |
| |
| //---------------------------------------------------------------------- |
| // |
| // EmulateInstructionARM implementation |
| // |
| //---------------------------------------------------------------------- |
| |
| void |
| EmulateInstructionARM::Initialize () |
| { |
| } |
| |
| void |
| EmulateInstructionARM::Terminate () |
| { |
| } |
| |
| // Write "bits (32) UNKNOWN" to memory address "address". Helper function for many ARM instructions. |
| bool |
| EmulateInstructionARM::WriteBits32UnknownToMemory (addr_t address) |
| { |
| EmulateInstruction::Context context; |
| context.type = EmulateInstruction::eContextWriteMemoryRandomBits; |
| context.SetNoArgs (); |
| |
| uint32_t random_data = rand (); |
| const uint32_t addr_byte_size = GetAddressByteSize(); |
| |
| if (!MemAWrite (context, address, random_data, addr_byte_size)) |
| return false; |
| |
| return true; |
| } |
| |
| // Write "bits (32) UNKNOWN" to register n. Helper function for many ARM instructions. |
| bool |
| EmulateInstructionARM::WriteBits32Unknown (int n) |
| { |
| EmulateInstruction::Context context; |
| context.type = EmulateInstruction::eContextWriteRegisterRandomBits; |
| context.SetNoArgs (); |
| |
| bool success; |
| uint32_t data = ReadRegisterUnsigned (eRegisterKindDWARF, dwarf_r0 + n, 0, &success); |
| |
| if (!success) |
| return false; |
| |
| if (!WriteRegisterUnsigned (context, eRegisterKindDWARF, dwarf_r0 + n, data)) |
| return false; |
| |
| return true; |
| } |
| |
| // Push Multiple Registers stores multiple registers to the stack, storing to |
| // consecutive memory locations ending just below the address in SP, and updates |
| // SP to point to the start of the stored data. |
| bool |
| EmulateInstructionARM::EmulatePUSH (ARMEncoding encoding) |
| { |
| #if 0 |
| // ARM pseudo code... |
| if (ConditionPassed()) |
| { |
| EncodingSpecificOperations(); |
| NullCheckIfThumbEE(13); |
| address = SP - 4*BitCount(registers); |
| |
| for (i = 0 to 14) |
| { |
| if (registers<i> == ’1’) |
| { |
| if i == 13 && i != LowestSetBit(registers) // Only possible for encoding A1 |
| MemA[address,4] = bits(32) UNKNOWN; |
| else |
| MemA[address,4] = R[i]; |
| address = address + 4; |
| } |
| } |
| |
| if (registers<15> == ’1’) // Only possible for encoding A1 or A2 |
| MemA[address,4] = PCStoreValue(); |
| |
| SP = SP - 4*BitCount(registers); |
| } |
| #endif |
| |
| bool success = false; |
| const uint32_t opcode = OpcodeAsUnsigned (&success); |
| if (!success) |
| return false; |
| |
| if (ConditionPassed()) |
| { |
| const uint32_t addr_byte_size = GetAddressByteSize(); |
| const addr_t sp = ReadCoreReg (SP_REG, &success); |
| if (!success) |
| return false; |
| uint32_t registers = 0; |
| uint32_t Rt; // the source register |
| switch (encoding) { |
| case eEncodingT1: |
| registers = Bits32(opcode, 7, 0); |
| // The M bit represents LR. |
| if (Bit32(opcode, 8)) |
| registers |= (1u << 14); |
| // if BitCount(registers) < 1 then UNPREDICTABLE; |
| if (BitCount(registers) < 1) |
| return false; |
| break; |
| case eEncodingT2: |
| // Ignore bits 15 & 13. |
| registers = Bits32(opcode, 15, 0) & ~0xa000; |
| // if BitCount(registers) < 2 then UNPREDICTABLE; |
| if (BitCount(registers) < 2) |
| return false; |
| break; |
| case eEncodingT3: |
| Rt = Bits32(opcode, 15, 12); |
| // if BadReg(t) then UNPREDICTABLE; |
| if (BadReg(Rt)) |
| return false; |
| registers = (1u << Rt); |
| break; |
| case eEncodingA1: |
| registers = Bits32(opcode, 15, 0); |
| // Instead of return false, let's handle the following case as well, |
| // which amounts to pushing one reg onto the full descending stacks. |
| // if BitCount(register_list) < 2 then SEE STMDB / STMFD; |
| break; |
| case eEncodingA2: |
| Rt = Bits32(opcode, 15, 12); |
| // if t == 13 then UNPREDICTABLE; |
| if (Rt == dwarf_sp) |
| return false; |
| registers = (1u << Rt); |
| break; |
| default: |
| return false; |
| } |
| addr_t sp_offset = addr_byte_size * BitCount (registers); |
| addr_t addr = sp - sp_offset; |
| uint32_t i; |
| |
| EmulateInstruction::Context context; |
| context.type = EmulateInstruction::eContextPushRegisterOnStack; |
| Register dwarf_reg; |
| dwarf_reg.SetRegister (eRegisterKindDWARF, 0); |
| for (i=0; i<15; ++i) |
| { |
| if (BitIsSet (registers, i)) |
| { |
| dwarf_reg.num = dwarf_r0 + i; |
| context.SetRegisterPlusOffset (dwarf_reg, addr - sp); |
| uint32_t reg_value = ReadCoreReg(i, &success); |
| if (!success) |
| return false; |
| if (!MemAWrite (context, addr, reg_value, addr_byte_size)) |
| return false; |
| addr += addr_byte_size; |
| } |
| } |
| |
| if (BitIsSet (registers, 15)) |
| { |
| dwarf_reg.num = dwarf_pc; |
| context.SetRegisterPlusOffset (dwarf_reg, addr - sp); |
| const uint32_t pc = ReadCoreReg(PC_REG, &success); |
| if (!success) |
| return false; |
| if (!MemAWrite (context, addr, pc, addr_byte_size)) |
| return false; |
| } |
| |
| context.type = EmulateInstruction::eContextAdjustStackPointer; |
| context.SetImmediateSigned (-sp_offset); |
| |
| if (!WriteRegisterUnsigned (context, eRegisterKindGeneric, LLDB_REGNUM_GENERIC_SP, sp - sp_offset)) |
| return false; |
| } |
| return true; |
| } |
| |
| // Pop Multiple Registers loads multiple registers from the stack, loading from |
| // consecutive memory locations staring at the address in SP, and updates |
| // SP to point just above the loaded data. |
| bool |
| EmulateInstructionARM::EmulatePOP (ARMEncoding encoding) |
| { |
| #if 0 |
| // ARM pseudo code... |
| if (ConditionPassed()) |
| { |
| EncodingSpecificOperations(); NullCheckIfThumbEE(13); |
| address = SP; |
| for i = 0 to 14 |
| if registers<i> == ‘1’ then |
| R[i} = if UnalignedAllowed then MemU[address,4] else MemA[address,4]; address = address + 4; |
| if registers<15> == ‘1’ then |
| if UnalignedAllowed then |
| LoadWritePC(MemU[address,4]); |
| else |
| LoadWritePC(MemA[address,4]); |
| if registers<13> == ‘0’ then SP = SP + 4*BitCount(registers); |
| if registers<13> == ‘1’ then SP = bits(32) UNKNOWN; |
| } |
| #endif |
| |
| bool success = false; |
| const uint32_t opcode = OpcodeAsUnsigned (&success); |
| if (!success) |
| return false; |
| |
| if (ConditionPassed()) |
| { |
| const uint32_t addr_byte_size = GetAddressByteSize(); |
| const addr_t sp = ReadCoreReg (SP_REG, &success); |
| if (!success) |
| return false; |
| uint32_t registers = 0; |
| uint32_t Rt; // the destination register |
| switch (encoding) { |
| case eEncodingT1: |
| registers = Bits32(opcode, 7, 0); |
| // The P bit represents PC. |
| if (Bit32(opcode, 8)) |
| registers |= (1u << 15); |
| // if BitCount(registers) < 1 then UNPREDICTABLE; |
| if (BitCount(registers) < 1) |
| return false; |
| break; |
| case eEncodingT2: |
| // Ignore bit 13. |
| registers = Bits32(opcode, 15, 0) & ~0x2000; |
| // if BitCount(registers) < 2 || (P == '1' && M == '1') then UNPREDICTABLE; |
| if (BitCount(registers) < 2 || (Bit32(opcode, 15) && Bit32(opcode, 14))) |
| return false; |
| // if registers<15> == '1' && InITBlock() && !LastInITBlock() then UNPREDICTABLE; |
| if (BitIsSet(registers, 15) && InITBlock() && !LastInITBlock()) |
| return false; |
| break; |
| case eEncodingT3: |
| Rt = Bits32(opcode, 15, 12); |
| // if t == 13 || (t == 15 && InITBlock() && !LastInITBlock()) then UNPREDICTABLE; |
| if (Rt == 13) |
| return false; |
| if (Rt == 15 && InITBlock() && !LastInITBlock()) |
| return false; |
| registers = (1u << Rt); |
| break; |
| case eEncodingA1: |
| registers = Bits32(opcode, 15, 0); |
| // Instead of return false, let's handle the following case as well, |
| // which amounts to popping one reg from the full descending stacks. |
| // if BitCount(register_list) < 2 then SEE LDM / LDMIA / LDMFD; |
| |
| // if registers<13> == ‘1’ && ArchVersion() >= 7 then UNPREDICTABLE; |
| if (BitIsSet(opcode, 13) && ArchVersion() >= ARMv7) |
| return false; |
| break; |
| case eEncodingA2: |
| Rt = Bits32(opcode, 15, 12); |
| // if t == 13 then UNPREDICTABLE; |
| if (Rt == dwarf_sp) |
| return false; |
| registers = (1u << Rt); |
| break; |
| default: |
| return false; |
| } |
| addr_t sp_offset = addr_byte_size * BitCount (registers); |
| addr_t addr = sp; |
| uint32_t i, data; |
| |
| EmulateInstruction::Context context; |
| context.type = EmulateInstruction::eContextPopRegisterOffStack; |
| Register dwarf_reg; |
| dwarf_reg.SetRegister (eRegisterKindDWARF, 0); |
| for (i=0; i<15; ++i) |
| { |
| if (BitIsSet (registers, i)) |
| { |
| dwarf_reg.num = dwarf_r0 + i; |
| context.SetRegisterPlusOffset (dwarf_reg, addr - sp); |
| data = MemARead(context, addr, 4, 0, &success); |
| if (!success) |
| return false; |
| if (!WriteRegisterUnsigned(context, eRegisterKindDWARF, dwarf_reg.num, data)) |
| return false; |
| addr += addr_byte_size; |
| } |
| } |
| |
| if (BitIsSet (registers, 15)) |
| { |
| dwarf_reg.num = dwarf_pc; |
| context.SetRegisterPlusOffset (dwarf_reg, addr - sp); |
| data = MemARead(context, addr, 4, 0, &success); |
| if (!success) |
| return false; |
| // In ARMv5T and above, this is an interworking branch. |
| if (!LoadWritePC(context, data)) |
| return false; |
| addr += addr_byte_size; |
| } |
| |
| context.type = EmulateInstruction::eContextAdjustStackPointer; |
| context.SetImmediateSigned (sp_offset); |
| |
| if (!WriteRegisterUnsigned (context, eRegisterKindGeneric, LLDB_REGNUM_GENERIC_SP, sp + sp_offset)) |
| return false; |
| } |
| return true; |
| } |
| |
| // Set r7 or ip to point to saved value residing within the stack. |
| // ADD (SP plus immediate) |
| bool |
| EmulateInstructionARM::EmulateADDRdSPImm (ARMEncoding encoding) |
| { |
| #if 0 |
| // ARM pseudo code... |
| if (ConditionPassed()) |
| { |
| EncodingSpecificOperations(); |
| (result, carry, overflow) = AddWithCarry(SP, imm32, ‘0’); |
| if d == 15 then |
| ALUWritePC(result); // setflags is always FALSE here |
| else |
| R[d] = result; |
| if setflags then |
| APSR.N = result<31>; |
| APSR.Z = IsZeroBit(result); |
| APSR.C = carry; |
| APSR.V = overflow; |
| } |
| #endif |
| |
| bool success = false; |
| const uint32_t opcode = OpcodeAsUnsigned (&success); |
| if (!success) |
| return false; |
| |
| if (ConditionPassed()) |
| { |
| const addr_t sp = ReadCoreReg (SP_REG, &success); |
| if (!success) |
| return false; |
| uint32_t Rd; // the destination register |
| uint32_t imm32; |
| switch (encoding) { |
| case eEncodingT1: |
| Rd = 7; |
| imm32 = Bits32(opcode, 7, 0) << 2; // imm32 = ZeroExtend(imm8:'00', 32) |
| break; |
| case eEncodingA1: |
| Rd = Bits32(opcode, 15, 12); |
| imm32 = ARMExpandImm(opcode); // imm32 = ARMExpandImm(imm12) |
| break; |
| default: |
| return false; |
| } |
| addr_t sp_offset = imm32; |
| addr_t addr = sp + sp_offset; // a pointer to the stack area |
| |
| EmulateInstruction::Context context; |
| context.type = EmulateInstruction::eContextRegisterPlusOffset; |
| Register sp_reg; |
| sp_reg.SetRegister (eRegisterKindGeneric, LLDB_REGNUM_GENERIC_SP); |
| context.SetRegisterPlusOffset (sp_reg, sp_offset); |
| |
| if (!WriteRegisterUnsigned (context, eRegisterKindDWARF, dwarf_r0 + Rd, addr)) |
| return false; |
| } |
| return true; |
| } |
| |
| // Set r7 or ip to the current stack pointer. |
| // MOV (register) |
| bool |
| EmulateInstructionARM::EmulateMOVRdSP (ARMEncoding encoding) |
| { |
| #if 0 |
| // ARM pseudo code... |
| if (ConditionPassed()) |
| { |
| EncodingSpecificOperations(); |
| result = R[m]; |
| if d == 15 then |
| ALUWritePC(result); // setflags is always FALSE here |
| else |
| R[d] = result; |
| if setflags then |
| APSR.N = result<31>; |
| APSR.Z = IsZeroBit(result); |
| // APSR.C unchanged |
| // APSR.V unchanged |
| } |
| #endif |
| |
| bool success = false; |
| //const uint32_t opcode = OpcodeAsUnsigned (&success); |
| //if (!success) |
| // return false; |
| |
| if (ConditionPassed()) |
| { |
| const addr_t sp = ReadCoreReg (SP_REG, &success); |
| if (!success) |
| return false; |
| uint32_t Rd; // the destination register |
| switch (encoding) { |
| case eEncodingT1: |
| Rd = 7; |
| break; |
| case eEncodingA1: |
| Rd = 12; |
| break; |
| default: |
| return false; |
| } |
| |
| EmulateInstruction::Context context; |
| context.type = EmulateInstruction::eContextRegisterPlusOffset; |
| Register sp_reg; |
| sp_reg.SetRegister (eRegisterKindGeneric, LLDB_REGNUM_GENERIC_SP); |
| context.SetRegisterPlusOffset (sp_reg, 0); |
| |
| if (!WriteRegisterUnsigned (context, eRegisterKindDWARF, dwarf_r0 + Rd, sp)) |
| return false; |
| } |
| return true; |
| } |
| |
| // Move from high register (r8-r15) to low register (r0-r7). |
| // MOV (register) |
| bool |
| EmulateInstructionARM::EmulateMOVLowHigh (ARMEncoding encoding) |
| { |
| return EmulateMOVRdRm (encoding); |
| } |
| |
| // Move from register to register. |
| // MOV (register) |
| bool |
| EmulateInstructionARM::EmulateMOVRdRm (ARMEncoding encoding) |
| { |
| #if 0 |
| // ARM pseudo code... |
| if (ConditionPassed()) |
| { |
| EncodingSpecificOperations(); |
| result = R[m]; |
| if d == 15 then |
| ALUWritePC(result); // setflags is always FALSE here |
| else |
| R[d] = result; |
| if setflags then |
| APSR.N = result<31>; |
| APSR.Z = IsZeroBit(result); |
| // APSR.C unchanged |
| // APSR.V unchanged |
| } |
| #endif |
| |
| bool success = false; |
| const uint32_t opcode = OpcodeAsUnsigned (&success); |
| if (!success) |
| return false; |
| |
| if (ConditionPassed()) |
| { |
| uint32_t Rm; // the source register |
| uint32_t Rd; // the destination register |
| bool setflags; |
| switch (encoding) { |
| case eEncodingT1: |
| Rd = Bit32(opcode, 7) << 3 | Bits32(opcode, 2, 0); |
| Rm = Bits32(opcode, 6, 3); |
| setflags = false; |
| if (Rd == 15 && InITBlock() && !LastInITBlock()) |
| return false; |
| break; |
| case eEncodingT2: |
| Rd = Bits32(opcode, 2, 0); |
| Rm = Bits32(opcode, 5, 3); |
| setflags = true; |
| if (InITBlock()) |
| return false; |
| break; |
| case eEncodingT3: |
| Rd = Bits32(opcode, 11, 8); |
| Rm = Bits32(opcode, 3, 0); |
| setflags = BitIsSet(opcode, 20); |
| // if setflags && (BadReg(d) || BadReg(m)) then UNPREDICTABLE; |
| if (setflags && (BadReg(Rd) || BadReg(Rm))) |
| return false; |
| // if !setflags && (d == 15 || m == 15 || (d == 13 && m == 13)) then UNPREDICTABLE; |
| if (!setflags && (Rd == 15 || Rm == 15 || (Rd == 13 && Rm == 13))) |
| return false; |
| break; |
| default: |
| return false; |
| } |
| uint32_t result = ReadCoreReg(Rm, &success); |
| if (!success) |
| return false; |
| |
| // The context specifies that Rm is to be moved into Rd. |
| EmulateInstruction::Context context; |
| context.type = EmulateInstruction::eContextRegisterPlusOffset; |
| Register dwarf_reg; |
| dwarf_reg.SetRegister (eRegisterKindDWARF, dwarf_r0 + Rm); |
| context.SetRegisterPlusOffset (dwarf_reg, 0); |
| |
| if (!WriteCoreRegOptionalFlags(context, result, Rd, setflags)) |
| return false; |
| } |
| return true; |
| } |
| |
| // Move (immediate) writes an immediate value to the destination register. It |
| // can optionally update the condition flags based on the value. |
| // MOV (immediate) |
| bool |
| EmulateInstructionARM::EmulateMOVRdImm (ARMEncoding encoding) |
| { |
| #if 0 |
| // ARM pseudo code... |
| if (ConditionPassed()) |
| { |
| EncodingSpecificOperations(); |
| result = imm32; |
| if d == 15 then // Can only occur for ARM encoding |
| ALUWritePC(result); // setflags is always FALSE here |
| else |
| R[d] = result; |
| if setflags then |
| APSR.N = result<31>; |
| APSR.Z = IsZeroBit(result); |
| APSR.C = carry; |
| // APSR.V unchanged |
| } |
| #endif |
| bool success = false; |
| const uint32_t opcode = OpcodeAsUnsigned (&success); |
| if (!success) |
| return false; |
| |
| if (ConditionPassed()) |
| { |
| uint32_t Rd; // the destination register |
| uint32_t imm32; // the immediate value to be written to Rd |
| uint32_t carry; // the carry bit after ThumbExpandImm_C or ARMExpandImm_C. |
| bool setflags; |
| switch (encoding) { |
| case eEncodingT1: |
| Rd = Bits32(opcode, 10, 8); |
| setflags = !InITBlock(); |
| imm32 = Bits32(opcode, 7, 0); // imm32 = ZeroExtend(imm8, 32) |
| carry = APSR_C; |
| break; |
| case eEncodingT2: |
| Rd = Bits32(opcode, 11, 8); |
| setflags = BitIsSet(opcode, 20); |
| imm32 = ThumbExpandImm_C(opcode, APSR_C, carry); |
| if (BadReg(Rd)) |
| return false; |
| break; |
| default: |
| return false; |
| } |
| uint32_t result = imm32; |
| |
| // The context specifies that an immediate is to be moved into Rd. |
| EmulateInstruction::Context context; |
| context.type = EmulateInstruction::eContextImmediate; |
| context.SetNoArgs (); |
| |
| if (!WriteCoreRegOptionalFlags(context, result, Rd, setflags, carry)) |
| return false; |
| } |
| return true; |
| } |
| |
| // Bitwise NOT (immediate) writes the bitwise inverse of an immediate value to the destination register. |
| // It can optionally update the condition flags based on the value. |
| bool |
| EmulateInstructionARM::EmulateMVNImm (ARMEncoding encoding) |
| { |
| #if 0 |
| // ARM pseudo code... |
| if (ConditionPassed()) |
| { |
| EncodingSpecificOperations(); |
| result = NOT(imm32); |
| if d == 15 then // Can only occur for ARM encoding |
| ALUWritePC(result); // setflags is always FALSE here |
| else |
| R[d] = result; |
| if setflags then |
| APSR.N = result<31>; |
| APSR.Z = IsZeroBit(result); |
| APSR.C = carry; |
| // APSR.V unchanged |
| } |
| #endif |
| bool success = false; |
| const uint32_t opcode = OpcodeAsUnsigned (&success); |
| if (!success) |
| return false; |
| |
| if (ConditionPassed()) |
| { |
| uint32_t Rd; // the destination register |
| uint32_t imm32; // the output after ThumbExpandImm_C or ARMExpandImm_C |
| uint32_t carry; // the carry bit after ThumbExpandImm_C or ARMExpandImm_C |
| bool setflags; |
| switch (encoding) { |
| case eEncodingT1: |
| Rd = Bits32(opcode, 11, 8); |
| setflags = BitIsSet(opcode, 20); |
| imm32 = ThumbExpandImm_C(opcode, APSR_C, carry); |
| break; |
| case eEncodingA1: |
| Rd = Bits32(opcode, 15, 12); |
| setflags = BitIsSet(opcode, 20); |
| imm32 = ARMExpandImm_C(opcode, APSR_C, carry); |
| // if Rd == '1111' && S == '1' then SEE SUBS PC, LR and related instructions; |
| // TODO: Emulate SUBS PC, LR and related instructions. |
| if (Rd == 15 && setflags) |
| return false; |
| break; |
| default: |
| return false; |
| } |
| uint32_t result = ~imm32; |
| |
| // The context specifies that an immediate is to be moved into Rd. |
| EmulateInstruction::Context context; |
| context.type = EmulateInstruction::eContextImmediate; |
| context.SetNoArgs (); |
| |
| if (!WriteCoreRegOptionalFlags(context, result, Rd, setflags, carry)) |
| return false; |
| } |
| return true; |
| } |
| |
| // Bitwise NOT (register) writes the bitwise inverse of a register value to the destination register. |
| // It can optionally update the condition flags based on the result. |
| bool |
| EmulateInstructionARM::EmulateMVNReg (ARMEncoding encoding) |
| { |
| #if 0 |
| // ARM pseudo code... |
| if (ConditionPassed()) |
| { |
| EncodingSpecificOperations(); |
| (shifted, carry) = Shift_C(R[m], shift_t, shift_n, APSR.C); |
| result = NOT(shifted); |
| if d == 15 then // Can only occur for ARM encoding |
| ALUWritePC(result); // setflags is always FALSE here |
| else |
| R[d] = result; |
| if setflags then |
| APSR.N = result<31>; |
| APSR.Z = IsZeroBit(result); |
| APSR.C = carry; |
| // APSR.V unchanged |
| } |
| #endif |
| |
| bool success = false; |
| const uint32_t opcode = OpcodeAsUnsigned (&success); |
| if (!success) |
| return false; |
| |
| if (ConditionPassed()) |
| { |
| uint32_t Rm; // the source register |
| uint32_t Rd; // the destination register |
| ARM_ShifterType shift_t; |
| uint32_t shift_n; // the shift applied to the value read from Rm |
| bool setflags; |
| uint32_t carry; // the carry bit after the shift operation |
| switch (encoding) { |
| case eEncodingT1: |
| Rd = Bits32(opcode, 2, 0); |
| Rm = Bits32(opcode, 5, 3); |
| setflags = !InITBlock(); |
| shift_t = SRType_LSL; |
| shift_n = 0; |
| if (InITBlock()) |
| return false; |
| break; |
| case eEncodingT2: |
| Rd = Bits32(opcode, 11, 8); |
| Rm = Bits32(opcode, 3, 0); |
| setflags = BitIsSet(opcode, 20); |
| shift_n = DecodeImmShiftThumb(opcode, shift_t); |
| // if (BadReg(d) || BadReg(m)) then UNPREDICTABLE; |
| if (BadReg(Rd) || BadReg(Rm)) |
| return false; |
| break; |
| case eEncodingA1: |
| Rd = Bits32(opcode, 15, 12); |
| Rm = Bits32(opcode, 3, 0); |
| setflags = BitIsSet(opcode, 20); |
| shift_n = DecodeImmShiftARM(opcode, shift_t); |
| break; |
| default: |
| return false; |
| } |
| uint32_t value = ReadCoreReg(Rm, &success); |
| if (!success) |
| return false; |
| |
| uint32_t shifted = Shift_C(value, shift_t, shift_n, APSR_C, carry); |
| uint32_t result = ~shifted; |
| |
| // The context specifies that an immediate is to be moved into Rd. |
| EmulateInstruction::Context context; |
| context.type = EmulateInstruction::eContextImmediate; |
| context.SetNoArgs (); |
| |
| if (!WriteCoreRegOptionalFlags(context, result, Rd, setflags, carry)) |
| return false; |
| } |
| return true; |
| } |
| |
| // PC relative immediate load into register, possibly followed by ADD (SP plus register). |
| // LDR (literal) |
| bool |
| EmulateInstructionARM::EmulateLDRRtPCRelative (ARMEncoding encoding) |
| { |
| #if 0 |
| // ARM pseudo code... |
| if (ConditionPassed()) |
| { |
| EncodingSpecificOperations(); NullCheckIfThumbEE(15); |
| base = Align(PC,4); |
| address = if add then (base + imm32) else (base - imm32); |
| data = MemU[address,4]; |
| if t == 15 then |
| if address<1:0> == ‘00’ then LoadWritePC(data); else UNPREDICTABLE; |
| elsif UnalignedSupport() || address<1:0> = ‘00’ then |
| R[t] = data; |
| else // Can only apply before ARMv7 |
| if CurrentInstrSet() == InstrSet_ARM then |
| R[t] = ROR(data, 8*UInt(address<1:0>)); |
| else |
| R[t] = bits(32) UNKNOWN; |
| } |
| #endif |
| |
| bool success = false; |
| const uint32_t opcode = OpcodeAsUnsigned (&success); |
| if (!success) |
| return false; |
| |
| if (ConditionPassed()) |
| { |
| const uint32_t pc = ReadCoreReg(PC_REG, &success); |
| if (!success) |
| return false; |
| |
| // PC relative immediate load context |
| EmulateInstruction::Context context; |
| context.type = EmulateInstruction::eContextRegisterPlusOffset; |
| Register pc_reg; |
| pc_reg.SetRegister (eRegisterKindGeneric, LLDB_REGNUM_GENERIC_PC); |
| context.SetRegisterPlusOffset (pc_reg, 0); |
| |
| uint32_t Rt; // the destination register |
| uint32_t imm32; // immediate offset from the PC |
| bool add; // +imm32 or -imm32? |
| addr_t base; // the base address |
| addr_t address; // the PC relative address |
| uint32_t data; // the literal data value from the PC relative load |
| switch (encoding) { |
| case eEncodingT1: |
| Rt = Bits32(opcode, 10, 8); |
| imm32 = Bits32(opcode, 7, 0) << 2; // imm32 = ZeroExtend(imm8:'00', 32); |
| add = true; |
| break; |
| case eEncodingT2: |
| Rt = Bits32(opcode, 15, 12); |
| imm32 = Bits32(opcode, 11, 0) << 2; // imm32 = ZeroExtend(imm12, 32); |
| add = BitIsSet(opcode, 23); |
| if (Rt == 15 && InITBlock() && !LastInITBlock()) |
| return false; |
| break; |
| default: |
| return false; |
| } |
| |
| base = Align(pc, 4); |
| if (add) |
| address = base + imm32; |
| else |
| address = base - imm32; |
| |
| context.SetRegisterPlusOffset(pc_reg, address - base); |
| data = MemURead(context, address, 4, 0, &success); |
| if (!success) |
| return false; |
| |
| if (Rt == 15) |
| { |
| if (Bits32(address, 1, 0) == 0) |
| { |
| // In ARMv5T and above, this is an interworking branch. |
| if (!LoadWritePC(context, data)) |
| return false; |
| } |
| else |
| return false; |
| } |
| else if (UnalignedSupport() || Bits32(address, 1, 0) == 0) |
| { |
| if (!WriteRegisterUnsigned (context, eRegisterKindDWARF, dwarf_r0 + Rt, data)) |
| return false; |
| } |
| else // We don't handle ARM for now. |
| return false; |
| |
| if (!WriteRegisterUnsigned (context, eRegisterKindDWARF, dwarf_r0 + Rt, data)) |
| return false; |
| } |
| return true; |
| } |
| |
| // An add operation to adjust the SP. |
| // ADD (SP plus immediate) |
| bool |
| EmulateInstructionARM::EmulateADDSPImm (ARMEncoding encoding) |
| { |
| #if 0 |
| // ARM pseudo code... |
| if (ConditionPassed()) |
| { |
| EncodingSpecificOperations(); |
| (result, carry, overflow) = AddWithCarry(SP, imm32, ‘0’); |
| if d == 15 then // Can only occur for ARM encoding |
| ALUWritePC(result); // setflags is always FALSE here |
| else |
| R[d] = result; |
| if setflags then |
| APSR.N = result<31>; |
| APSR.Z = IsZeroBit(result); |
| APSR.C = carry; |
| APSR.V = overflow; |
| } |
| #endif |
| |
| bool success = false; |
| const uint32_t opcode = OpcodeAsUnsigned (&success); |
| if (!success) |
| return false; |
| |
| if (ConditionPassed()) |
| { |
| const addr_t sp = ReadCoreReg (SP_REG, &success); |
| if (!success) |
| return false; |
| uint32_t imm32; // the immediate operand |
| switch (encoding) { |
| case eEncodingT2: |
| imm32 = ThumbImmScaled(opcode); // imm32 = ZeroExtend(imm7:'00', 32) |
| break; |
| default: |
| return false; |
| } |
| addr_t sp_offset = imm32; |
| addr_t addr = sp + sp_offset; // the adjusted stack pointer value |
| |
| EmulateInstruction::Context context; |
| context.type = EmulateInstruction::eContextAdjustStackPointer; |
| context.SetImmediateSigned (sp_offset); |
| |
| if (!WriteRegisterUnsigned (context, eRegisterKindGeneric, LLDB_REGNUM_GENERIC_SP, addr)) |
| return false; |
| } |
| return true; |
| } |
| |
| // An add operation to adjust the SP. |
| // ADD (SP plus register) |
| bool |
| EmulateInstructionARM::EmulateADDSPRm (ARMEncoding encoding) |
| { |
| #if 0 |
| // ARM pseudo code... |
| if (ConditionPassed()) |
| { |
| EncodingSpecificOperations(); |
| shifted = Shift(R[m], shift_t, shift_n, APSR.C); |
| (result, carry, overflow) = AddWithCarry(SP, shifted, ‘0’); |
| if d == 15 then |
| ALUWritePC(result); // setflags is always FALSE here |
| else |
| R[d] = result; |
| if setflags then |
| APSR.N = result<31>; |
| APSR.Z = IsZeroBit(result); |
| APSR.C = carry; |
| APSR.V = overflow; |
| } |
| #endif |
| |
| bool success = false; |
| const uint32_t opcode = OpcodeAsUnsigned (&success); |
| if (!success) |
| return false; |
| |
| if (ConditionPassed()) |
| { |
| const addr_t sp = ReadCoreReg (SP_REG, &success); |
| if (!success) |
| return false; |
| uint32_t Rm; // the second operand |
| switch (encoding) { |
| case eEncodingT2: |
| Rm = Bits32(opcode, 6, 3); |
| break; |
| default: |
| return false; |
| } |
| int32_t reg_value = ReadCoreReg(Rm, &success); |
| if (!success) |
| return false; |
| |
| addr_t addr = (int32_t)sp + reg_value; // the adjusted stack pointer value |
| |
| EmulateInstruction::Context context; |
| context.type = EmulateInstruction::eContextAdjustStackPointer; |
| context.SetImmediateSigned (reg_value); |
| |
| if (!WriteRegisterUnsigned (context, eRegisterKindGeneric, LLDB_REGNUM_GENERIC_SP, addr)) |
| return false; |
| } |
| return true; |
| } |
| |
| // Branch with Link and Exchange Instruction Sets (immediate) calls a subroutine |
| // at a PC-relative address, and changes instruction set from ARM to Thumb, or |
| // from Thumb to ARM. |
| // BLX (immediate) |
| bool |
| EmulateInstructionARM::EmulateBLXImmediate (ARMEncoding encoding) |
| { |
| #if 0 |
| // ARM pseudo code... |
| if (ConditionPassed()) |
| { |
| EncodingSpecificOperations(); |
| if CurrentInstrSet() == InstrSet_ARM then |
| LR = PC - 4; |
| else |
| LR = PC<31:1> : '1'; |
| if targetInstrSet == InstrSet_ARM then |
| targetAddress = Align(PC,4) + imm32; |
| else |
| targetAddress = PC + imm32; |
| SelectInstrSet(targetInstrSet); |
| BranchWritePC(targetAddress); |
| } |
| #endif |
| |
| bool success = false; |
| const uint32_t opcode = OpcodeAsUnsigned (&success); |
| if (!success) |
| return false; |
| |
| if (ConditionPassed()) |
| { |
| EmulateInstruction::Context context; |
| context.type = EmulateInstruction::eContextRelativeBranchImmediate; |
| const uint32_t pc = ReadCoreReg(PC_REG, &success); |
| if (!success) |
| return false; |
| addr_t lr; // next instruction address |
| addr_t target; // target address |
| int32_t imm32; // PC-relative offset |
| switch (encoding) { |
| case eEncodingT1: |
| { |
| lr = pc | 1u; // return address |
| uint32_t S = Bit32(opcode, 26); |
| uint32_t imm10 = Bits32(opcode, 25, 16); |
| uint32_t J1 = Bit32(opcode, 13); |
| uint32_t J2 = Bit32(opcode, 11); |
| uint32_t imm11 = Bits32(opcode, 10, 0); |
| uint32_t I1 = !(J1 ^ S); |
| uint32_t I2 = !(J2 ^ S); |
| uint32_t imm25 = (S << 24) | (I1 << 23) | (I2 << 22) | (imm10 << 12) | (imm11 << 1); |
| imm32 = llvm::SignExtend32<25>(imm25); |
| target = pc + imm32; |
| context.SetModeAndImmediateSigned (eModeThumb, 4 + imm32); |
| if (InITBlock() && !LastInITBlock()) |
| return false; |
| break; |
| } |
| case eEncodingT2: |
| { |
| lr = pc | 1u; // return address |
| uint32_t S = Bit32(opcode, 26); |
| uint32_t imm10H = Bits32(opcode, 25, 16); |
| uint32_t J1 = Bit32(opcode, 13); |
| uint32_t J2 = Bit32(opcode, 11); |
| uint32_t imm10L = Bits32(opcode, 10, 1); |
| uint32_t I1 = !(J1 ^ S); |
| uint32_t I2 = !(J2 ^ S); |
| uint32_t imm25 = (S << 24) | (I1 << 23) | (I2 << 22) | (imm10H << 12) | (imm10L << 2); |
| imm32 = llvm::SignExtend32<25>(imm25); |
| target = Align(pc, 4) + imm32; |
| context.SetModeAndImmediateSigned (eModeARM, 4 + imm32); |
| if (InITBlock() && !LastInITBlock()) |
| return false; |
| break; |
| } |
| case eEncodingA1: |
| lr = pc + 4; // return address |
| imm32 = llvm::SignExtend32<26>(Bits32(opcode, 23, 0) << 2); |
| target = Align(pc, 4) + imm32; |
| context.SetModeAndImmediateSigned (eModeARM, 8 + imm32); |
| break; |
| case eEncodingA2: |
| lr = pc + 4; // return address |
| imm32 = llvm::SignExtend32<26>(Bits32(opcode, 23, 0) << 2 | Bits32(opcode, 24, 24) << 1); |
| target = pc + imm32; |
| context.SetModeAndImmediateSigned (eModeThumb, 8 + imm32); |
| break; |
| default: |
| return false; |
| } |
| if (!WriteRegisterUnsigned (context, eRegisterKindGeneric, LLDB_REGNUM_GENERIC_RA, lr)) |
| return false; |
| if (!BranchWritePC(context, target)) |
| return false; |
| } |
| return true; |
| } |
| |
| // Branch with Link and Exchange (register) calls a subroutine at an address and |
| // instruction set specified by a register. |
| // BLX (register) |
| bool |
| EmulateInstructionARM::EmulateBLXRm (ARMEncoding encoding) |
| { |
| #if 0 |
| // ARM pseudo code... |
| if (ConditionPassed()) |
| { |
| EncodingSpecificOperations(); |
| target = R[m]; |
| if CurrentInstrSet() == InstrSet_ARM then |
| next_instr_addr = PC - 4; |
| LR = next_instr_addr; |
| else |
| next_instr_addr = PC - 2; |
| LR = next_instr_addr<31:1> : ‘1’; |
| BXWritePC(target); |
| } |
| #endif |
| |
| bool success = false; |
| const uint32_t opcode = OpcodeAsUnsigned (&success); |
| if (!success) |
| return false; |
| |
| if (ConditionPassed()) |
| { |
| EmulateInstruction::Context context; |
| context.type = EmulateInstruction::eContextAbsoluteBranchRegister; |
| const uint32_t pc = ReadCoreReg(PC_REG, &success); |
| addr_t lr; // next instruction address |
| if (!success) |
| return false; |
| uint32_t Rm; // the register with the target address |
| switch (encoding) { |
| case eEncodingT1: |
| lr = (pc - 2) | 1u; // return address |
| Rm = Bits32(opcode, 6, 3); |
| // if m == 15 then UNPREDICTABLE; |
| if (Rm == 15) |
| return false; |
| if (InITBlock() && !LastInITBlock()) |
| return false; |
| break; |
| case eEncodingA1: |
| lr = pc - 4; // return address |
| Rm = Bits32(opcode, 3, 0); |
| // if m == 15 then UNPREDICTABLE; |
| if (Rm == 15) |
| return false; |
| break; |
| default: |
| return false; |
| } |
| addr_t target = ReadCoreReg (Rm, &success); |
| if (!success) |
| return false; |
| Register dwarf_reg; |
| dwarf_reg.SetRegister (eRegisterKindDWARF, dwarf_r0 + Rm); |
| context.SetRegister (dwarf_reg); |
| if (!WriteRegisterUnsigned (context, eRegisterKindGeneric, LLDB_REGNUM_GENERIC_RA, lr)) |
| return false; |
| if (!BXWritePC(context, target)) |
| return false; |
| } |
| return true; |
| } |
| |
| // Branch and Exchange causes a branch to an address and instruction set specified by a register. |
| // BX |
| bool |
| EmulateInstructionARM::EmulateBXRm (ARMEncoding encoding) |
| { |
| #if 0 |
| // ARM pseudo code... |
| if (ConditionPassed()) |
| { |
| EncodingSpecificOperations(); |
| BXWritePC(R[m]); |
| } |
| #endif |
| |
| bool success = false; |
| const uint32_t opcode = OpcodeAsUnsigned (&success); |
| if (!success) |
| return false; |
| |
| if (ConditionPassed()) |
| { |
| EmulateInstruction::Context context; |
| context.type = EmulateInstruction::eContextAbsoluteBranchRegister; |
| uint32_t Rm; // the register with the target address |
| switch (encoding) { |
| case eEncodingT1: |
| Rm = Bits32(opcode, 6, 3); |
| if (InITBlock() && !LastInITBlock()) |
| return false; |
| break; |
| case eEncodingA1: |
| Rm = Bits32(opcode, 3, 0); |
| break; |
| default: |
| return false; |
| } |
| addr_t target = ReadCoreReg (Rm, &success); |
| if (!success) |
| return false; |
| |
| Register dwarf_reg; |
| dwarf_reg.SetRegister (eRegisterKindDWARF, dwarf_r0 + Rm); |
| context.SetRegister (dwarf_reg); |
| if (!BXWritePC(context, target)) |
| return false; |
| } |
| return true; |
| } |
| |
| // Set r7 to point to some ip offset. |
| // SUB (immediate) |
| bool |
| EmulateInstructionARM::EmulateSUBR7IPImm (ARMEncoding encoding) |
| { |
| #if 0 |
| // ARM pseudo code... |
| if (ConditionPassed()) |
| { |
| EncodingSpecificOperations(); |
| (result, carry, overflow) = AddWithCarry(SP, NOT(imm32), ‘1’); |
| if d == 15 then // Can only occur for ARM encoding |
| ALUWritePC(result); // setflags is always FALSE here |
| else |
| R[d] = result; |
| if setflags then |
| APSR.N = result<31>; |
| APSR.Z = IsZeroBit(result); |
| APSR.C = carry; |
| APSR.V = overflow; |
| } |
| #endif |
| |
| bool success = false; |
| const uint32_t opcode = OpcodeAsUnsigned (&success); |
| if (!success) |
| return false; |
| |
| if (ConditionPassed()) |
| { |
| const addr_t ip = ReadCoreReg (12, &success); |
| if (!success) |
| return false; |
| uint32_t imm32; |
| switch (encoding) { |
| case eEncodingA1: |
| imm32 = ARMExpandImm(opcode); // imm32 = ARMExpandImm(imm12) |
| break; |
| default: |
| return false; |
| } |
| addr_t ip_offset = imm32; |
| addr_t addr = ip - ip_offset; // the adjusted ip value |
| |
| EmulateInstruction::Context context; |
| context.type = EmulateInstruction::eContextRegisterPlusOffset; |
| Register dwarf_reg; |
| dwarf_reg.SetRegister (eRegisterKindDWARF, dwarf_r12); |
| context.SetRegisterPlusOffset (dwarf_reg, -ip_offset); |
| |
| if (!WriteRegisterUnsigned (context, eRegisterKindDWARF, dwarf_r7, addr)) |
| return false; |
| } |
| return true; |
| } |
| |
| // Set ip to point to some stack offset. |
| // SUB (SP minus immediate) |
| bool |
| EmulateInstructionARM::EmulateSUBIPSPImm (ARMEncoding encoding) |
| { |
| #if 0 |
| // ARM pseudo code... |
| if (ConditionPassed()) |
| { |
| EncodingSpecificOperations(); |
| (result, carry, overflow) = AddWithCarry(SP, NOT(imm32), ‘1’); |
| if d == 15 then // Can only occur for ARM encoding |
| ALUWritePC(result); // setflags is always FALSE here |
| else |
| R[d] = result; |
| if setflags then |
| APSR.N = result<31>; |
| APSR.Z = IsZeroBit(result); |
| APSR.C = carry; |
| APSR.V = overflow; |
| } |
| #endif |
| |
| bool success = false; |
| const uint32_t opcode = OpcodeAsUnsigned (&success); |
| if (!success) |
| return false; |
| |
| if (ConditionPassed()) |
| { |
| const addr_t sp = ReadCoreReg (SP_REG, &success); |
| if (!success) |
| return false; |
| uint32_t imm32; |
| switch (encoding) { |
| case eEncodingA1: |
| imm32 = ARMExpandImm(opcode); // imm32 = ARMExpandImm(imm12) |
| break; |
| default: |
| return false; |
| } |
| addr_t sp_offset = imm32; |
| addr_t addr = sp - sp_offset; // the adjusted stack pointer value |
| |
| EmulateInstruction::Context context; |
| context.type = EmulateInstruction::eContextRegisterPlusOffset; |
| Register dwarf_reg; |
| dwarf_reg.SetRegister (eRegisterKindGeneric, LLDB_REGNUM_GENERIC_SP); |
| context.SetRegisterPlusOffset (dwarf_reg, -sp_offset); |
| |
| if (!WriteRegisterUnsigned (context, eRegisterKindDWARF, dwarf_r12, addr)) |
| return false; |
| } |
| return true; |
| } |
| |
| // A sub operation to adjust the SP -- allocate space for local storage. |
| bool |
| EmulateInstructionARM::EmulateSUBSPImm (ARMEncoding encoding) |
| { |
| #if 0 |
| // ARM pseudo code... |
| if (ConditionPassed()) |
| { |
| EncodingSpecificOperations(); |
| (result, carry, overflow) = AddWithCarry(SP, NOT(imm32), ‘1’); |
| if d == 15 then // Can only occur for ARM encoding |
| ALUWritePC(result); // setflags is always FALSE here |
| else |
| R[d] = result; |
| if setflags then |
| APSR.N = result<31>; |
| APSR.Z = IsZeroBit(result); |
| APSR.C = carry; |
| APSR.V = overflow; |
| } |
| #endif |
| |
| bool success = false; |
| const uint32_t opcode = OpcodeAsUnsigned (&success); |
| if (!success) |
| return false; |
| |
| if (ConditionPassed()) |
| { |
| const addr_t sp = ReadCoreReg (SP_REG, &success); |
| if (!success) |
| return false; |
| uint32_t imm32; |
| switch (encoding) { |
| case eEncodingT1: |
| imm32 = ThumbImmScaled(opcode); // imm32 = ZeroExtend(imm7:'00', 32) |
| break; |
| case eEncodingT2: |
| imm32 = ThumbExpandImm(opcode); // imm32 = ThumbExpandImm(i:imm3:imm8) |
| break; |
| case eEncodingT3: |
| imm32 = ThumbImm12(opcode); // imm32 = ZeroExtend(i:imm3:imm8, 32) |
| break; |
| case eEncodingA1: |
| imm32 = ARMExpandImm(opcode); // imm32 = ARMExpandImm(imm12) |
| break; |
| default: |
| return false; |
| } |
| addr_t sp_offset = imm32; |
| addr_t addr = sp - sp_offset; // the adjusted stack pointer value |
| |
| EmulateInstruction::Context context; |
| context.type = EmulateInstruction::eContextAdjustStackPointer; |
| context.SetImmediateSigned (-sp_offset); |
| |
| if (!WriteRegisterUnsigned (context, eRegisterKindGeneric, LLDB_REGNUM_GENERIC_SP, addr)) |
| return false; |
| } |
| return true; |
| } |
| |
| // A store operation to the stack that also updates the SP. |
| bool |
| EmulateInstructionARM::EmulateSTRRtSP (ARMEncoding encoding) |
| { |
| #if 0 |
| // ARM pseudo code... |
| if (ConditionPassed()) |
| { |
| EncodingSpecificOperations(); |
| offset_addr = if add then (R[n] + imm32) else (R[n] - imm32); |
| address = if index then offset_addr else R[n]; |
| MemU[address,4] = if t == 15 then PCStoreValue() else R[t]; |
| if wback then R[n] = offset_addr; |
| } |
| #endif |
| |
| bool success = false; |
| const uint32_t opcode = OpcodeAsUnsigned (&success); |
| if (!success) |
| return false; |
| |
| if (ConditionPassed()) |
| { |
| const uint32_t addr_byte_size = GetAddressByteSize(); |
| const addr_t sp = ReadCoreReg (SP_REG, &success); |
| if (!success) |
| return false; |
| uint32_t Rt; // the source register |
| uint32_t imm12; |
| switch (encoding) { |
| case eEncodingA1: |
| Rt = Bits32(opcode, 15, 12); |
| imm12 = Bits32(opcode, 11, 0); |
| break; |
| default: |
| return false; |
| } |
| addr_t sp_offset = imm12; |
| addr_t addr = sp - sp_offset; |
| |
| EmulateInstruction::Context context; |
| context.type = EmulateInstruction::eContextPushRegisterOnStack; |
| Register dwarf_reg; |
| dwarf_reg.SetRegister (eRegisterKindDWARF, 0); |
| if (Rt != 15) |
| { |
| dwarf_reg.num = dwarf_r0 + Rt; |
| context.SetRegisterPlusOffset (dwarf_reg, addr - sp); |
| uint32_t reg_value = ReadCoreReg(Rt, &success); |
| if (!success) |
| return false; |
| if (!MemUWrite (context, addr, reg_value, addr_byte_size)) |
| return false; |
| } |
| else |
| { |
| dwarf_reg.num = dwarf_pc; |
| context.SetRegisterPlusOffset (dwarf_reg, addr - sp); |
| const uint32_t pc = ReadCoreReg(PC_REG, &success); |
| if (!success) |
| return false; |
| if (!MemUWrite (context, addr, pc + 8, addr_byte_size)) |
| return false; |
| } |
| |
| context.type = EmulateInstruction::eContextAdjustStackPointer; |
| context.SetImmediateSigned (-sp_offset); |
| |
| if (!WriteRegisterUnsigned (context, eRegisterKindGeneric, LLDB_REGNUM_GENERIC_SP, sp - sp_offset)) |
| return false; |
| } |
| return true; |
| } |
| |
| // Vector Push stores multiple extension registers to the stack. |
| // It also updates SP to point to the start of the stored data. |
| bool |
| EmulateInstructionARM::EmulateVPUSH (ARMEncoding encoding) |
| { |
| #if 0 |
| // ARM pseudo code... |
| if (ConditionPassed()) |
| { |
| EncodingSpecificOperations(); CheckVFPEnabled(TRUE); NullCheckIfThumbEE(13); |
| address = SP - imm32; |
| SP = SP - imm32; |
| if single_regs then |
| for r = 0 to regs-1 |
| MemA[address,4] = S[d+r]; address = address+4; |
| else |
| for r = 0 to regs-1 |
| // Store as two word-aligned words in the correct order for current endianness. |
| MemA[address,4] = if BigEndian() then D[d+r]<63:32> else D[d+r]<31:0>; |
| MemA[address+4,4] = if BigEndian() then D[d+r]<31:0> else D[d+r]<63:32>; |
| address = address+8; |
| } |
| #endif |
| |
| bool success = false; |
| const uint32_t opcode = OpcodeAsUnsigned (&success); |
| if (!success) |
| return false; |
| |
| if (ConditionPassed()) |
| { |
| const uint32_t addr_byte_size = GetAddressByteSize(); |
| const addr_t sp = ReadCoreReg (SP_REG, &success); |
| if (!success) |
| return false; |
| bool single_regs; |
| uint32_t d; // UInt(D:Vd) or UInt(Vd:D) starting register |
| uint32_t imm32; // stack offset |
| uint32_t regs; // number of registers |
| switch (encoding) { |
| case eEncodingT1: |
| case eEncodingA1: |
| single_regs = false; |
| d = Bit32(opcode, 22) << 4 | Bits32(opcode, 15, 12); |
| imm32 = Bits32(opcode, 7, 0) * addr_byte_size; |
| // If UInt(imm8) is odd, see "FSTMX". |
| regs = Bits32(opcode, 7, 0) / 2; |
| // if regs == 0 || regs > 16 || (d+regs) > 32 then UNPREDICTABLE; |
| if (regs == 0 || regs > 16 || (d + regs) > 32) |
| return false; |
| break; |
| case eEncodingT2: |
| case eEncodingA2: |
| single_regs = true; |
| d = Bits32(opcode, 15, 12) << 1 | Bit32(opcode, 22); |
| imm32 = Bits32(opcode, 7, 0) * addr_byte_size; |
| regs = Bits32(opcode, 7, 0); |
| // if regs == 0 || regs > 16 || (d+regs) > 32 then UNPREDICTABLE; |
| if (regs == 0 || regs > 16 || (d + regs) > 32) |
| return false; |
| break; |
| default: |
| return false; |
| } |
| uint32_t start_reg = single_regs ? dwarf_s0 : dwarf_d0; |
| uint32_t reg_byte_size = single_regs ? addr_byte_size : addr_byte_size * 2; |
| addr_t sp_offset = imm32; |
| addr_t addr = sp - sp_offset; |
| uint32_t i; |
| |
| EmulateInstruction::Context context; |
| context.type = EmulateInstruction::eContextPushRegisterOnStack; |
| Register dwarf_reg; |
| dwarf_reg.SetRegister (eRegisterKindDWARF, 0); |
| for (i=d; i<regs; ++i) |
| { |
| dwarf_reg.num = start_reg + i; |
| context.SetRegisterPlusOffset ( dwarf_reg, addr - sp); |
| // uint64_t to accommodate 64-bit registers. |
| uint64_t reg_value = ReadRegisterUnsigned(eRegisterKindDWARF, dwarf_reg.num, 0, &success); |
| if (!success) |
| return false; |
| if (!MemAWrite (context, addr, reg_value, reg_byte_size)) |
| return false; |
| addr += reg_byte_size; |
| } |
| |
| context.type = EmulateInstruction::eContextAdjustStackPointer; |
| context.SetImmediateSigned (-sp_offset); |
| |
| if (!WriteRegisterUnsigned (context, eRegisterKindGeneric, LLDB_REGNUM_GENERIC_SP, sp - sp_offset)) |
| return false; |
| } |
| return true; |
| } |
| |
| // Vector Pop loads multiple extension registers from the stack. |
| // It also updates SP to point just above the loaded data. |
| bool |
| EmulateInstructionARM::EmulateVPOP (ARMEncoding encoding) |
| { |
| #if 0 |
| // ARM pseudo code... |
| if (ConditionPassed()) |
| { |
| EncodingSpecificOperations(); CheckVFPEnabled(TRUE); NullCheckIfThumbEE(13); |
| address = SP; |
| SP = SP + imm32; |
| if single_regs then |
| for r = 0 to regs-1 |
| S[d+r] = MemA[address,4]; address = address+4; |
| else |
| for r = 0 to regs-1 |
| word1 = MemA[address,4]; word2 = MemA[address+4,4]; address = address+8; |
| // Combine the word-aligned words in the correct order for current endianness. |
| D[d+r] = if BigEndian() then word1:word2 else word2:word1; |
| } |
| #endif |
| |
| bool success = false; |
| const uint32_t opcode = OpcodeAsUnsigned (&success); |
| if (!success) |
| return false; |
| |
| if (ConditionPassed()) |
| { |
| const uint32_t addr_byte_size = GetAddressByteSize(); |
| const addr_t sp = ReadCoreReg (SP_REG, &success); |
| if (!success) |
| return false; |
| bool single_regs; |
| uint32_t d; // UInt(D:Vd) or UInt(Vd:D) starting register |
| uint32_t imm32; // stack offset |
| uint32_t regs; // number of registers |
| switch (encoding) { |
| case eEncodingT1: |
| case eEncodingA1: |
| single_regs = false; |
| d = Bit32(opcode, 22) << 4 | Bits32(opcode, 15, 12); |
| imm32 = Bits32(opcode, 7, 0) * addr_byte_size; |
| // If UInt(imm8) is odd, see "FLDMX". |
| regs = Bits32(opcode, 7, 0) / 2; |
| // if regs == 0 || regs > 16 || (d+regs) > 32 then UNPREDICTABLE; |
| if (regs == 0 || regs > 16 || (d + regs) > 32) |
| return false; |
| break; |
| case eEncodingT2: |
| case eEncodingA2: |
| single_regs = true; |
| d = Bits32(opcode, 15, 12) << 1 | Bit32(opcode, 22); |
| imm32 = Bits32(opcode, 7, 0) * addr_byte_size; |
| regs = Bits32(opcode, 7, 0); |
| // if regs == 0 || regs > 16 || (d+regs) > 32 then UNPREDICTABLE; |
| if (regs == 0 || regs > 16 || (d + regs) > 32) |
| return false; |
| break; |
| default: |
| return false; |
| } |
| uint32_t start_reg = single_regs ? dwarf_s0 : dwarf_d0; |
| uint32_t reg_byte_size = single_regs ? addr_byte_size : addr_byte_size * 2; |
| addr_t sp_offset = imm32; |
| addr_t addr = sp; |
| uint32_t i; |
| uint64_t data; // uint64_t to accomodate 64-bit registers. |
| |
| EmulateInstruction::Context context; |
| context.type = EmulateInstruction::eContextPopRegisterOffStack; |
| Register dwarf_reg; |
| dwarf_reg.SetRegister (eRegisterKindDWARF, 0); |
| for (i=d; i<regs; ++i) |
| { |
| dwarf_reg.num = start_reg + i; |
| context.SetRegisterPlusOffset (dwarf_reg, addr - sp); |
| data = MemARead(context, addr, reg_byte_size, 0, &success); |
| if (!success) |
| return false; |
| if (!WriteRegisterUnsigned(context, eRegisterKindDWARF, dwarf_reg.num, data)) |
| return false; |
| addr += reg_byte_size; |
| } |
| |
| context.type = EmulateInstruction::eContextAdjustStackPointer; |
| context.SetImmediateSigned (sp_offset); |
| |
| if (!WriteRegisterUnsigned (context, eRegisterKindGeneric, LLDB_REGNUM_GENERIC_SP, sp + sp_offset)) |
| return false; |
| } |
| return true; |
| } |
| |
| // SVC (previously SWI) |
| bool |
| EmulateInstructionARM::EmulateSVC (ARMEncoding encoding) |
| { |
| #if 0 |
| // ARM pseudo code... |
| if (ConditionPassed()) |
| { |
| EncodingSpecificOperations(); |
| CallSupervisor(); |
| } |
| #endif |
| |
| bool success = false; |
| const uint32_t opcode = OpcodeAsUnsigned (&success); |
| if (!success) |
| return false; |
| |
| if (ConditionPassed()) |
| { |
| const uint32_t pc = ReadCoreReg(PC_REG, &success); |
| addr_t lr; // next instruction address |
| if (!success) |
| return false; |
| uint32_t imm32; // the immediate constant |
| uint32_t mode; // ARM or Thumb mode |
| switch (encoding) { |
| case eEncodingT1: |
| lr = (pc + 2) | 1u; // return address |
| imm32 = Bits32(opcode, 7, 0); |
| mode = eModeThumb; |
| break; |
| case eEncodingA1: |
| lr = pc + 4; // return address |
| imm32 = Bits32(opcode, 23, 0); |
| mode = eModeARM; |
| break; |
| default: |
| return false; |
| } |
| |
| EmulateInstruction::Context context; |
| context.type = EmulateInstruction::eContextSupervisorCall; |
| context.SetModeAndImmediate (mode, imm32); |
| if (!WriteRegisterUnsigned (context, eRegisterKindGeneric, LLDB_REGNUM_GENERIC_RA, lr)) |
| return false; |
| } |
| return true; |
| } |
| |
| // If Then makes up to four following instructions (the IT block) conditional. |
| bool |
| EmulateInstructionARM::EmulateIT (ARMEncoding encoding) |
| { |
| #if 0 |
| // ARM pseudo code... |
| EncodingSpecificOperations(); |
| ITSTATE.IT<7:0> = firstcond:mask; |
| #endif |
| |
| bool success = false; |
| const uint32_t opcode = OpcodeAsUnsigned (&success); |
| if (!success) |
| return false; |
| |
| m_it_session.InitIT(Bits32(opcode, 7, 0)); |
| return true; |
| } |
| |
| // Branch causes a branch to a target address. |
| bool |
| EmulateInstructionARM::EmulateB (ARMEncoding encoding) |
| { |
| #if 0 |
| // ARM pseudo code... |
| if (ConditionPassed()) |
| { |
| EncodingSpecificOperations(); |
| BranchWritePC(PC + imm32); |
| } |
| #endif |
| |
| bool success = false; |
| const uint32_t opcode = OpcodeAsUnsigned (&success); |
| if (!success) |
| return false; |
| |
| if (ConditionPassed()) |
| { |
| EmulateInstruction::Context context; |
| context.type = EmulateInstruction::eContextRelativeBranchImmediate; |
| const uint32_t pc = ReadCoreReg(PC_REG, &success); |
| if (!success) |
| return false; |
| addr_t target; // target address |
| int32_t imm32; // PC-relative offset |
| switch (encoding) { |
| case eEncodingT1: |
| // The 'cond' field is handled in EmulateInstructionARM::CurrentCond(). |
| imm32 = llvm::SignExtend32<9>(Bits32(opcode, 7, 0) << 1); |
| target = pc + imm32; |
| context.SetModeAndImmediateSigned (eModeThumb, 4 + imm32); |
| break; |
| case eEncodingT2: |
| imm32 = llvm::SignExtend32<12>(Bits32(opcode, 10, 0)); |
| target = pc + imm32; |
| context.SetModeAndImmediateSigned (eModeThumb, 4 + imm32); |
| break; |
| case eEncodingT3: |
| // The 'cond' field is handled in EmulateInstructionARM::CurrentCond(). |
| { |
| uint32_t S = Bit32(opcode, 26); |
| uint32_t imm6 = Bits32(opcode, 21, 16); |
| uint32_t J1 = Bit32(opcode, 13); |
| uint32_t J2 = Bit32(opcode, 11); |
| uint32_t imm11 = Bits32(opcode, 10, 0); |
| uint32_t imm21 = (S << 20) | (J2 << 19) | (J1 << 18) | (imm6 << 12) | (imm11 << 1); |
| imm32 = llvm::SignExtend32<21>(imm21); |
| target = pc + imm32; |
| context.SetModeAndImmediateSigned (eModeThumb, 4 + imm32); |
| break; |
| } |
| case eEncodingT4: |
| { |
| uint32_t S = Bit32(opcode, 26); |
| uint32_t imm10 = Bits32(opcode, 25, 16); |
| uint32_t J1 = Bit32(opcode, 13); |
| uint32_t J2 = Bit32(opcode, 11); |
| uint32_t imm11 = Bits32(opcode, 10, 0); |
| uint32_t I1 = !(J1 ^ S); |
| uint32_t I2 = !(J2 ^ S); |
| uint32_t imm25 = (S << 24) | (I1 << 23) | (I2 << 22) | (imm10 << 12) | (imm11 << 1); |
| imm32 = llvm::SignExtend32<25>(imm25); |
| target = pc + imm32; |
| context.SetModeAndImmediateSigned (eModeThumb, 4 + imm32); |
| break; |
| } |
| case eEncodingA1: |
| imm32 = llvm::SignExtend32<26>(Bits32(opcode, 23, 0) << 2); |
| target = pc + imm32; |
| context.SetModeAndImmediateSigned (eModeARM, 8 + imm32); |
| break; |
| default: |
| return false; |
| } |
| if (!BranchWritePC(context, target)) |
| return false; |
| } |
| return true; |
| } |
| |
| // Compare and Branch on Nonzero and Compare and Branch on Zero compare the value in a register with |
| // zero and conditionally branch forward a constant value. They do not affect the condition flags. |
| // CBNZ, CBZ |
| bool |
| EmulateInstructionARM::EmulateCB (ARMEncoding encoding) |
| { |
| #if 0 |
| // ARM pseudo code... |
| EncodingSpecificOperations(); |
| if nonzero ^ IsZero(R[n]) then |
| BranchWritePC(PC + imm32); |
| #endif |
| |
| bool success = false; |
| const uint32_t opcode = OpcodeAsUnsigned (&success); |
| if (!success) |
| return false; |
| |
| // Read the register value from the operand register Rn. |
| uint32_t reg_val = ReadCoreReg(Bits32(opcode, 2, 0), &success); |
| if (!success) |
| return false; |
| |
| EmulateInstruction::Context context; |
| context.type = EmulateInstruction::eContextRelativeBranchImmediate; |
| const uint32_t pc = ReadCoreReg(PC_REG, &success); |
| if (!success) |
| return false; |
| |
| addr_t target; // target address |
| uint32_t imm32; // PC-relative offset to branch forward |
| bool nonzero; |
| switch (encoding) { |
| case eEncodingT1: |
| imm32 = Bit32(opcode, 9) << 6 | Bits32(opcode, 7, 3) << 1; |
| nonzero = BitIsSet(opcode, 11); |
| target = pc + imm32; |
| context.SetModeAndImmediateSigned (eModeThumb, 4 + imm32); |
| break; |
| default: |
| return false; |
| } |
| if (nonzero ^ (reg_val == 0)) |
| if (!BranchWritePC(context, target)) |
| return false; |
| |
| return true; |
| } |
| |
| // Table Branch Byte causes a PC-relative forward branch using a table of single byte offsets. |
| // A base register provides a pointer to the table, and a second register supplies an index into the table. |
| // The branch length is twice the value of the byte returned from the table. |
| // |
| // Table Branch Halfword causes a PC-relative forward branch using a table of single halfword offsets. |
| // A base register provides a pointer to the table, and a second register supplies an index into the table. |
| // The branch length is twice the value of the halfword returned from the table. |
| // TBB, TBH |
| bool |
| EmulateInstructionARM::EmulateTB (ARMEncoding encoding) |
| { |
| #if 0 |
| // ARM pseudo code... |
| EncodingSpecificOperations(); NullCheckIfThumbEE(n); |
| if is_tbh then |
| halfwords = UInt(MemU[R[n]+LSL(R[m],1), 2]); |
| else |
| halfwords = UInt(MemU[R[n]+R[m], 1]); |
| BranchWritePC(PC + 2*halfwords); |
| #endif |
| |
| bool success = false; |
| const uint32_t opcode = OpcodeAsUnsigned (&success); |
| if (!success) |
| return false; |
| |
| uint32_t Rn; // the base register which contains the address of the table of branch lengths |
| uint32_t Rm; // the index register which contains an integer pointing to a byte/halfword in the table |
| bool is_tbh; // true if table branch halfword |
| switch (encoding) { |
| case eEncodingT1: |
| Rn = Bits32(opcode, 19, 16); |
| Rm = Bits32(opcode, 3, 0); |
| is_tbh = BitIsSet(opcode, 4); |
| if (Rn == 13 || BadReg(Rm)) |
| return false; |
| if (InITBlock() && !LastInITBlock()) |
| return false; |
| break; |
| default: |
| return false; |
| } |
| |
| // Read the address of the table from the operand register Rn. |
| // The PC can be used, in which case the table immediately follows this instruction. |
| uint32_t base = ReadCoreReg(Rm, &success); |
| if (!success) |
| return false; |
| |
| // the table index |
| uint32_t index = ReadCoreReg(Rm, &success); |
| if (!success) |
| return false; |
| |
| // the offsetted table address |
| addr_t addr = base + (is_tbh ? index*2 : index); |
| |
| // PC-relative offset to branch forward |
| EmulateInstruction::Context context; |
| context.type = EmulateInstruction::eContextTableBranchReadMemory; |
| uint32_t offset = MemURead(context, addr, is_tbh ? 2 : 1, 0, &success) * 2; |
| if (!success) |
| return false; |
| |
| const uint32_t pc = ReadCoreReg(PC_REG, &success); |
| if (!success) |
| return false; |
| |
| // target address |
| addr_t target = pc + offset; |
| context.type = EmulateInstruction::eContextRelativeBranchImmediate; |
| context.SetModeAndImmediateSigned (eModeThumb, 4 + offset); |
| |
| if (!BranchWritePC(context, target)) |
| return false; |
| |
| return true; |
| } |
| |
| // This instruction adds an immediate value to a register value, and writes the result to the destination |
| // register. It can optionally update the condition flags based on the result. |
| bool |
| EmulateInstructionARM::EmulateADDImmARM (ARMEncoding encoding) |
| { |
| #if 0 |
| // ARM pseudo code... |
| if ConditionPassed() then |
| EncodingSpecificOperations(); |
| (result, carry, overflow) = AddWithCarry(R[n], imm32, '0'); |
| if d == 15 then |
| ALUWritePC(result); // setflags is always FALSE here |
| else |
| R[d] = result; |
| if setflags then |
| APSR.N = result<31>; |
| APSR.Z = IsZeroBit(result); |
| APSR.C = carry; |
| APSR.V = overflow; |
| #endif |
| |
| bool success = false; |
| const uint32_t opcode = OpcodeAsUnsigned (&success); |
| if (!success) |
| return false; |
| |
| if (ConditionPassed()) |
| { |
| uint32_t Rd, Rn; |
| uint32_t imm32; // the immediate value to be added to the value obtained from Rn |
| bool setflags; |
| switch (encoding) |
| { |
| case eEncodingA1: |
| Rd = Bits32(opcode, 15, 12); |
| Rn = Bits32(opcode, 19, 16); |
| setflags = BitIsSet(opcode, 20); |
| imm32 = ARMExpandImm(opcode); // imm32 = ARMExpandImm(imm12) |
| break; |
| default: |
| return false; |
| } |
| |
| // Read the first operand. |
| uint32_t val1 = ReadCoreReg(Rn, &success); |
| if (!success) |
| return false; |
| |
| AddWithCarryResult res = AddWithCarry(val1, imm32, 0); |
| |
| EmulateInstruction::Context context; |
| context.type = EmulateInstruction::eContextImmediate; |
| context.SetNoArgs (); |
| |
| if (!WriteCoreRegOptionalFlags(context, res.result, Rd, setflags, res.carry_out, res.overflow)) |
| return false; |
| } |
| return true; |
| } |
| |
| // This instruction adds a register value and an optionally-shifted register value, and writes the result |
| // to the destination register. It can optionally update the condition flags based on the result. |
| bool |
| EmulateInstructionARM::EmulateADDReg (ARMEncoding encoding) |
| { |
| #if 0 |
| // ARM pseudo code... |
| if ConditionPassed() then |
| EncodingSpecificOperations(); |
| shifted = Shift(R[m], shift_t, shift_n, APSR.C); |
| (result, carry, overflow) = AddWithCarry(R[n], shifted, '0'); |
| if d == 15 then |
| ALUWritePC(result); // setflags is always FALSE here |
| else |
| R[d] = result; |
| if setflags then |
| APSR.N = result<31>; |
| APSR.Z = IsZeroBit(result); |
| APSR.C = carry; |
| APSR.V = overflow; |
| #endif |
| |
| bool success = false; |
| const uint32_t opcode = OpcodeAsUnsigned (&success); |
| if (!success) |
| return false; |
| |
| if (ConditionPassed()) |
| { |
| uint32_t Rd, Rn, Rm; |
| ARM_ShifterType shift_t; |
| uint32_t shift_n; // the shift applied to the value read from Rm |
| bool setflags; |
| switch (encoding) |
| { |
| case eEncodingT1: |
| Rd = Bits32(opcode, 2, 0); |
| Rn = Bits32(opcode, 5, 3); |
| Rm = Bits32(opcode, 8, 6); |
| setflags = !InITBlock(); |
| shift_t = SRType_LSL; |
| shift_n = 0; |
| break; |
| case eEncodingT2: |
| Rd = Rn = Bit32(opcode, 7) << 3 | Bits32(opcode, 2, 0); |
| Rm = Bits32(opcode, 6, 3); |
| setflags = false; |
| shift_t = SRType_LSL; |
| shift_n = 0; |
| if (Rn == 15 && Rm == 15) |
| return false; |
| if (Rd == 15 && InITBlock() && !LastInITBlock()) |
| return false; |
| break; |
| case eEncodingA1: |
| Rd = Bits32(opcode, 15, 12); |
| Rn = Bits32(opcode, 19, 16); |
| Rm = Bits32(opcode, 3, 0); |
| setflags = BitIsSet(opcode, 20); |
| shift_n = DecodeImmShiftARM(opcode, shift_t); |
| break; |
| default: |
| return false; |
| } |
| |
| // Read the first operand. |
| uint32_t val1 = ReadCoreReg(Rn, &success); |
| if (!success) |
| return false; |
| |
| // Read the second operand. |
| uint32_t val2 = ReadCoreReg(Rm, &success); |
| if (!success) |
| return false; |
| |
| uint32_t shifted = Shift(val2, shift_t, shift_n, APSR_C); |
| AddWithCarryResult res = AddWithCarry(val1, shifted, 0); |
| |
| EmulateInstruction::Context context; |
| context.type = EmulateInstruction::eContextImmediate; |
| context.SetNoArgs (); |
| |
| if (!WriteCoreRegOptionalFlags(context, res.result, Rd, setflags, res.carry_out, res.overflow)) |
| return false; |
| } |
| return true; |
| } |
| |
| // Compare Negative (immediate) adds a register value and an immediate value. |
| // It updates the condition flags based on the result, and discards the result. |
| bool |
| EmulateInstructionARM::EmulateCMNImm (ARMEncoding encoding) |
| { |
| #if 0 |
| // ARM pseudo code... |
| if ConditionPassed() then |
| EncodingSpecificOperations(); |
| (result, carry, overflow) = AddWithCarry(R[n], imm32, '0'); |
| APSR.N = result<31>; |
| APSR.Z = IsZeroBit(result); |
| APSR.C = carry; |
| APSR.V = overflow; |
| #endif |
| |
| bool success = false; |
| const uint32_t opcode = OpcodeAsUnsigned (&success); |
| if (!success) |
| return false; |
| |
| uint32_t Rn; // the first operand |
| uint32_t imm32; // the immediate value to be compared with |
| switch (encoding) { |
| case eEncodingT1: |
| Rn = Bits32(opcode, 19, 16); |
| imm32 = ThumbExpandImm(opcode); // imm32 = ThumbExpandImm(i:imm3:imm8) |
| if (Rn == 15) |
| return false; |
| break; |
| case eEncodingA1: |
| Rn = Bits32(opcode, 19, 16); |
| imm32 = ARMExpandImm(opcode); // imm32 = ARMExpandImm(imm12) |
| break; |
| default: |
| return false; |
| } |
| // Read the register value from the operand register Rn. |
| uint32_t reg_val = ReadCoreReg(Rn, &success); |
| if (!success) |
| return false; |
| |
| AddWithCarryResult res = AddWithCarry(reg_val, imm32, 0); |
| |
| EmulateInstruction::Context context; |
| context.type = EmulateInstruction::eContextImmediate; |
| context.SetNoArgs (); |
| if (!WriteFlags(context, res.result, res.carry_out, res.overflow)) |
| return false; |
| |
| return true; |
| } |
| |
| // Compare Negative (register) adds a register value and an optionally-shifted register value. |
| // It updates the condition flags based on the result, and discards the result. |
| bool |
| EmulateInstructionARM::EmulateCMNReg (ARMEncoding encoding) |
| { |
| #if 0 |
| // ARM pseudo code... |
| if ConditionPassed() then |
| EncodingSpecificOperations(); |
| shifted = Shift(R[m], shift_t, shift_n, APSR.C); |
| (result, carry, overflow) = AddWithCarry(R[n], shifted, '0'); |
| APSR.N = result<31>; |
| APSR.Z = IsZeroBit(result); |
| APSR.C = carry; |
| APSR.V = overflow; |
| #endif |
| |
| bool success = false; |
| const uint32_t opcode = OpcodeAsUnsigned (&success); |
| if (!success) |
| return false; |
| |
| uint32_t Rn; // the first operand |
| uint32_t Rm; // the second operand |
| ARM_ShifterType shift_t; |
| uint32_t shift_n; // the shift applied to the value read from Rm |
| switch (encoding) { |
| case eEncodingT1: |
| Rn = Bits32(opcode, 2, 0); |
| Rm = Bits32(opcode, 5, 3); |
| shift_t = SRType_LSL; |
| shift_n = 0; |
| break; |
| case eEncodingT2: |
| Rn = Bits32(opcode, 19, 16); |
| Rm = Bits32(opcode, 3, 0); |
| shift_n = DecodeImmShiftThumb(opcode, shift_t); |
| // if n == 15 || BadReg(m) then UNPREDICTABLE; |
| if (Rn == 15 || BadReg(Rm)) |
| return false; |
| break; |
| case eEncodingA1: |
| Rn = Bits32(opcode, 19, 16); |
| Rm = Bits32(opcode, 3, 0); |
| shift_n = DecodeImmShiftARM(opcode, shift_t); |
| break; |
| default: |
| return false; |
| } |
| // Read the register value from register Rn. |
| uint32_t val1 = ReadCoreReg(Rn, &success); |
| if (!success) |
| return false; |
| |
| // Read the register value from register Rm. |
| uint32_t val2 = ReadCoreReg(Rm, &success); |
| if (!success) |
| return false; |
| |
| uint32_t shifted = Shift(val2, shift_t, shift_n, APSR_C); |
| AddWithCarryResult res = AddWithCarry(val1, shifted, 0); |
| |
| EmulateInstruction::Context context; |
| context.type = EmulateInstruction::eContextImmediate; |
| context.SetNoArgs(); |
| if (!WriteFlags(context, res.result, res.carry_out, res.overflow)) |
| return false; |
| |
| return true; |
| } |
| |
| // Compare (immediate) subtracts an immediate value from a register value. |
| // It updates the condition flags based on the result, and discards the result. |
| bool |
| EmulateInstructionARM::EmulateCMPImm (ARMEncoding encoding) |
| { |
| #if 0 |
| // ARM pseudo code... |
| if ConditionPassed() then |
| EncodingSpecificOperations(); |
| (result, carry, overflow) = AddWithCarry(R[n], NOT(imm32), '1'); |
| APSR.N = result<31>; |
| APSR.Z = IsZeroBit(result); |
| APSR.C = carry; |
| APSR.V = overflow; |
| #endif |
| |
| bool success = false; |
| const uint32_t opcode = OpcodeAsUnsigned (&success); |
| if (!success) |
| return false; |
| |
| uint32_t Rn; // the first operand |
| uint32_t imm32; // the immediate value to be compared with |
| switch (encoding) { |
| case eEncodingT1: |
| Rn = Bits32(opcode, 10, 8); |
| imm32 = Bits32(opcode, 7, 0); |
| break; |
| case eEncodingT2: |
| Rn = Bits32(opcode, 19, 16); |
| imm32 = ThumbExpandImm(opcode); // imm32 = ThumbExpandImm(i:imm3:imm8) |
| if (Rn == 15) |
| return false; |
| break; |
| case eEncodingA1: |
| Rn = Bits32(opcode, 19, 16); |
| imm32 = ARMExpandImm(opcode); // imm32 = ARMExpandImm(imm12) |
| break; |
| default: |
| return false; |
| } |
| // Read the register value from the operand register Rn. |
| uint32_t reg_val = ReadCoreReg(Rn, &success); |
| if (!success) |
| return false; |
| |
| AddWithCarryResult res = AddWithCarry(reg_val, ~imm32, 1); |
| |
| EmulateInstruction::Context context; |
| context.type = EmulateInstruction::eContextImmediate; |
| context.SetNoArgs (); |
| if (!WriteFlags(context, res.result, res.carry_out, res.overflow)) |
| return false; |
| |
| return true; |
| } |
| |
| // Compare (register) subtracts an optionally-shifted register value from a register value. |
| // It updates the condition flags based on the result, and discards the result. |
| bool |
| EmulateInstructionARM::EmulateCMPReg (ARMEncoding encoding) |
| { |
| #if 0 |
| // ARM pseudo code... |
| if ConditionPassed() then |
| EncodingSpecificOperations(); |
| shifted = Shift(R[m], shift_t, shift_n, APSR.C); |
| (result, carry, overflow) = AddWithCarry(R[n], NOT(shifted), '1'); |
| APSR.N = result<31>; |
| APSR.Z = IsZeroBit(result); |
| APSR.C = carry; |
| APSR.V = overflow; |
| #endif |
| |
| bool success = false; |
| const uint32_t opcode = OpcodeAsUnsigned (&success); |
| if (!success) |
| return false; |
| |
| uint32_t Rn; // the first operand |
| uint32_t Rm; // the second operand |
| ARM_ShifterType shift_t; |
| uint32_t shift_n; // the shift applied to the value read from Rm |
| switch (encoding) { |
| case eEncodingT1: |
| Rn = Bits32(opcode, 2, 0); |
| Rm = Bits32(opcode, 5, 3); |
| shift_t = SRType_LSL; |
| shift_n = 0; |
| break; |
| case eEncodingT2: |
| Rn = Bit32(opcode, 7) << 3 | Bits32(opcode, 2, 0); |
| Rm = Bits32(opcode, 6, 3); |
| shift_t = SRType_LSL; |
| shift_n = 0; |
| if (Rn < 8 && Rm < 8) |
| return false; |
| if (Rn == 15 || Rm == 15) |
| return false; |
| break; |
| case eEncodingA1: |
| Rn = Bits32(opcode, 19, 16); |
| Rm = Bits32(opcode, 3, 0); |
| shift_n = DecodeImmShiftARM(opcode, shift_t); |
| break; |
| default: |
| return false; |
| } |
| // Read the register value from register Rn. |
| uint32_t val1 = ReadCoreReg(Rn, &success); |
| if (!success) |
| return false; |
| |
| // Read the register value from register Rm. |
| uint32_t val2 = ReadCoreReg(Rm, &success); |
| if (!success) |
| return false; |
| |
| uint32_t shifted = Shift(val2, shift_t, shift_n, APSR_C); |
| AddWithCarryResult res = AddWithCarry(val1, ~shifted, 1); |
| |
| EmulateInstruction::Context context; |
| context.type = EmulateInstruction::eContextImmediate; |
| context.SetNoArgs(); |
| if (!WriteFlags(context, res.result, res.carry_out, res.overflow)) |
| return false; |
| |
| return true; |
| } |
| |
| // Arithmetic Shift Right (immediate) shifts a register value right by an immediate number of bits, |
| // shifting in copies of its sign bit, and writes the result to the destination register. It can |
| // optionally update the condition flags based on the result. |
| bool |
| EmulateInstructionARM::EmulateASRImm (ARMEncoding encoding) |
| { |
| #if 0 |
| // ARM pseudo code... |
| if ConditionPassed() then |
| EncodingSpecificOperations(); |
| (result, carry) = Shift_C(R[m], SRType_ASR, shift_n, APSR.C); |
| if d == 15 then // Can only occur for ARM encoding |
| ALUWritePC(result); // setflags is always FALSE here |
| else |
| R[d] = result; |
| if setflags then |
| APSR.N = result<31>; |
| APSR.Z = IsZeroBit(result); |
| APSR.C = carry; |
| // APSR.V unchanged |
| #endif |
| |
| return EmulateShiftImm(encoding, SRType_ASR); |
| } |
| |
| // Arithmetic Shift Right (register) shifts a register value right by a variable number of bits, |
| // shifting in copies of its sign bit, and writes the result to the destination register. |
| // The variable number of bits is read from the bottom byte of a register. It can optionally update |
| // the condition flags based on the result. |
| bool |
| EmulateInstructionARM::EmulateASRReg (ARMEncoding encoding) |
| { |
| #if 0 |
| // ARM pseudo code... |
| if ConditionPassed() then |
| EncodingSpecificOperations(); |
| shift_n = UInt(R[m]<7:0>); |
| (result, carry) = Shift_C(R[m], SRType_ASR, shift_n, APSR.C); |
| R[d] = result; |
| if setflags then |
| APSR.N = result<31>; |
| APSR.Z = IsZeroBit(result); |
| APSR.C = carry; |
| // APSR.V unchanged |
| #endif |
| |
| return EmulateShiftReg(encoding, SRType_ASR); |
| } |
| |
| // Logical Shift Left (immediate) shifts a register value left by an immediate number of bits, |
| // shifting in zeros, and writes the result to the destination register. It can optionally |
| // update the condition flags based on the result. |
| bool |
| EmulateInstructionARM::EmulateLSLImm (ARMEncoding encoding) |
| { |
| #if 0 |
| // ARM pseudo code... |
| if ConditionPassed() then |
| EncodingSpecificOperations(); |
| (result, carry) = Shift_C(R[m], SRType_LSL, shift_n, APSR.C); |
| if d == 15 then // Can only occur for ARM encoding |
| ALUWritePC(result); // setflags is always FALSE here |
| else |
| R[d] = result; |
| if setflags then |
| APSR.N = result<31>; |
| APSR.Z = IsZeroBit(result); |
| APSR.C = carry; |
| // APSR.V unchanged |
| #endif |
| |
| return EmulateShiftImm(encoding, SRType_LSL); |
| } |
| |
| // Logical Shift Left (register) shifts a register value left by a variable number of bits, |
| // shifting in zeros, and writes the result to the destination register. The variable number |
| // of bits is read from the bottom byte of a register. It can optionally update the condition |
| // flags based on the result. |
| bool |
| EmulateInstructionARM::EmulateLSLReg (ARMEncoding encoding) |
| { |
| #if 0 |
| // ARM pseudo code... |
| if ConditionPassed() then |
| EncodingSpecificOperations(); |
| shift_n = UInt(R[m]<7:0>); |
| (result, carry) = Shift_C(R[m], SRType_LSL, shift_n, APSR.C); |
| R[d] = result; |
| if setflags then |
| APSR.N = result<31>; |
| APSR.Z = IsZeroBit(result); |
| APSR.C = carry; |
| // APSR.V unchanged |
| #endif |
| |
| return EmulateShiftReg(encoding, SRType_LSL); |
| } |
| |
| // Logical Shift Right (immediate) shifts a register value right by an immediate number of bits, |
| // shifting in zeros, and writes the result to the destination register. It can optionally |
| // update the condition flags based on the result. |
| bool |
| EmulateInstructionARM::EmulateLSRImm (ARMEncoding encoding) |
| { |
| #if 0 |
| // ARM pseudo code... |
| if ConditionPassed() then |
| EncodingSpecificOperations(); |
| (result, carry) = Shift_C(R[m], SRType_LSR, shift_n, APSR.C); |
| if d == 15 then // Can only occur for ARM encoding |
| ALUWritePC(result); // setflags is always FALSE here |
| else |
| R[d] = result; |
| if setflags then |
| APSR.N = result<31>; |
| APSR.Z = IsZeroBit(result); |
| APSR.C = carry; |
| // APSR.V unchanged |
| #endif |
| |
| return EmulateShiftImm(encoding, SRType_LSR); |
| } |
| |
| // Logical Shift Right (register) shifts a register value right by a variable number of bits, |
| // shifting in zeros, and writes the result to the destination register. The variable number |
| // of bits is read from the bottom byte of a register. It can optionally update the condition |
| // flags based on the result. |
| bool |
| EmulateInstructionARM::EmulateLSRReg (ARMEncoding encoding) |
| { |
| #if 0 |
| // ARM pseudo code... |
| if ConditionPassed() then |
| EncodingSpecificOperations(); |
| shift_n = UInt(R[m]<7:0>); |
| (result, carry) = Shift_C(R[m], SRType_LSR, shift_n, APSR.C); |
| R[d] = result; |
| if setflags then |
| APSR.N = result<31>; |
| APSR.Z = IsZeroBit(result); |
| APSR.C = carry; |
| // APSR.V unchanged |
| #endif |
| |
| return EmulateShiftReg(encoding, SRType_LSR); |
| } |
| |
| // Rotate Right (immediate) provides the value of the contents of a register rotated by a constant value. |
| // The bits that are rotated off the right end are inserted into the vacated bit positions on the left. |
| // It can optionally update the condition flags based on the result. |
| bool |
| EmulateInstructionARM::EmulateRORImm (ARMEncoding encoding) |
| { |
| #if 0 |
| // ARM pseudo code... |
| if ConditionPassed() then |
| EncodingSpecificOperations(); |
| (result, carry) = Shift_C(R[m], SRType_ROR, shift_n, APSR.C); |
| if d == 15 then // Can only occur for ARM encoding |
| ALUWritePC(result); // setflags is always FALSE here |
| else |
| R[d] = result; |
| if setflags then |
| APSR.N = result<31>; |
| APSR.Z = IsZeroBit(result); |
| APSR.C = carry; |
| // APSR.V unchanged |
| #endif |
| |
| return EmulateShiftImm(encoding, SRType_ROR); |
| } |
| |
| // Rotate Right (register) provides the value of the contents of a register rotated by a variable number of bits. |
| // The bits that are rotated off the right end are inserted into the vacated bit positions on the left. |
| // The variable number of bits is read from the bottom byte of a register. It can optionally update the condition |
| // flags based on the result. |
| bool |
| EmulateInstructionARM::EmulateRORReg (ARMEncoding encoding) |
| { |
| #if 0 |
| // ARM pseudo code... |
| if ConditionPassed() then |
| EncodingSpecificOperations(); |
| shift_n = UInt(R[m]<7:0>); |
| (result, carry) = Shift_C(R[m], SRType_ROR, shift_n, APSR.C); |
| R[d] = result; |
| if setflags then |
| APSR.N = result<31>; |
| APSR.Z = IsZeroBit(result); |
| APSR.C = carry; |
| // APSR.V unchanged |
| #endif |
| |
| return EmulateShiftReg(encoding, SRType_ROR); |
| } |
| |
| // Rotate Right with Extend provides the value of the contents of a register shifted right by one place, |
| // with the carry flag shifted into bit [31]. |
| // |
| // RRX can optionally update the condition flags based on the result. |
| // In that case, bit [0] is shifted into the carry flag. |
| bool |
| EmulateInstructionARM::EmulateRRX (ARMEncoding encoding) |
| { |
| #if 0 |
| // ARM pseudo code... |
| if ConditionPassed() then |
| EncodingSpecificOperations(); |
| (result, carry) = Shift_C(R[m], SRType_RRX, 1, APSR.C); |
| if d == 15 then // Can only occur for ARM encoding |
| ALUWritePC(result); // setflags is always FALSE here |
| else |
| R[d] = result; |
| if setflags then |
| APSR.N = result<31>; |
| APSR.Z = IsZeroBit(result); |
| APSR.C = carry; |
| // APSR.V unchanged |
| #endif |
| |
| return EmulateShiftImm(encoding, SRType_RRX); |
| } |
| |
| bool |
| EmulateInstructionARM::EmulateShiftImm (ARMEncoding encoding, ARM_ShifterType shift_type) |
| { |
| assert(shift_type == SRType_ASR || shift_type == SRType_LSL || shift_type == SRType_LSR); |
| |
| bool success = false; |
| const uint32_t opcode = OpcodeAsUnsigned (&success); |
| if (!success) |
| return false; |
| |
| if (ConditionPassed()) |
| { |
| uint32_t Rd; // the destination register |
| uint32_t Rm; // the first operand register |
| uint32_t imm5; // encoding for the shift amount |
| uint32_t carry; // the carry bit after the shift operation |
| bool setflags; |
| |
| // Special case handling! |
| // A8.6.139 ROR (immediate) -- Encoding T1 |
| if (shift_type == SRType_ROR && encoding == eEncodingT1) |
| { |
| // Morph the T1 encoding from the ARM Architecture Manual into T2 encoding to |
| // have the same decoding of bit fields as the other Thumb2 shift operations. |
| encoding = eEncodingT2; |
| } |
| |
| switch (encoding) { |
| case eEncodingT1: |
| // Due to the above special case handling! |
| assert(shift_type != SRType_ROR); |
| |
| Rd = Bits32(opcode, 2, 0); |
| Rm = Bits32(opcode, 5, 3); |
| setflags = !InITBlock(); |
| imm5 = Bits32(opcode, 10, 6); |
| break; |
| case eEncodingT2: |
| // A8.6.141 RRX |
| assert(shift_type != SRType_RRX); |
| |
| Rd = Bits32(opcode, 11, 8); |
| Rm = Bits32(opcode, 3, 0); |
| setflags = BitIsSet(opcode, 20); |
| imm5 = Bits32(opcode, 14, 12) << 2 | Bits32(opcode, 7, 6); |
| if (BadReg(Rd) || BadReg(Rm)) |
| return false; |
| break; |
| case eEncodingA1: |
| Rd = Bits32(opcode, 15, 12); |
| Rm = Bits32(opcode, 3, 0); |
| setflags = BitIsSet(opcode, 20); |
| imm5 = Bits32(opcode, 11, 7); |
| break; |
| default: |
| return false; |
| } |
| |
| // A8.6.139 ROR (immediate) |
| if (shift_type == SRType_ROR && imm5 == 0) |
| shift_type = SRType_RRX; |
| |
| // Get the first operand. |
| uint32_t value = ReadCoreReg (Rm, &success); |
| if (!success) |
| return false; |
| |
| // Decode the shift amount if not RRX. |
| uint32_t amt = (shift_type == SRType_RRX ? 1 : DecodeImmShift(shift_type, imm5)); |
| |
| uint32_t result = Shift_C(value, shift_type, amt, APSR_C, carry); |
| |
| // The context specifies that an immediate is to be moved into Rd. |
| EmulateInstruction::Context context; |
| context.type = EmulateInstruction::eContextImmediate; |
| context.SetNoArgs (); |
| |
| if (!WriteCoreRegOptionalFlags(context, result, Rd, setflags, carry)) |
| return false; |
| } |
| return true; |
| } |
| |
| bool |
| EmulateInstructionARM::EmulateShiftReg (ARMEncoding encoding, ARM_ShifterType shift_type) |
| { |
| assert(shift_type == SRType_ASR || shift_type == SRType_LSL || shift_type == SRType_LSR); |
| |
| bool success = false; |
| const uint32_t opcode = OpcodeAsUnsigned (&success); |
| if (!success) |
| return false; |
| |
| if (ConditionPassed()) |
| { |
| uint32_t Rd; // the destination register |
| uint32_t Rn; // the first operand register |
| uint32_t Rm; // the register whose bottom byte contains the amount to shift by |
| uint32_t carry; // the carry bit after the shift operation |
| bool setflags; |
| switch (encoding) { |
| case eEncodingT1: |
| Rd = Bits32(opcode, 2, 0); |
| Rn = Rd; |
| Rm = Bits32(opcode, 5, 3); |
| setflags = !InITBlock(); |
| break; |
| case eEncodingT2: |
| Rd = Bits32(opcode, 11, 8); |
| Rn = Bits32(opcode, 19, 16); |
| Rm = Bits32(opcode, 3, 0); |
| setflags = BitIsSet(opcode, 20); |
| if (BadReg(Rd) || BadReg(Rn) || BadReg(Rm)) |
| return false; |
| break; |
| case eEncodingA1: |
| Rd = Bits32(opcode, 15, 12); |
| Rn = Bits32(opcode, 3, 0); |
| Rm = Bits32(opcode, 11, 8); |
| setflags = BitIsSet(opcode, 20); |
| if (Rd == 15 || Rn == 15 || Rm == 15) |
| return false; |
| break; |
| default: |
| return false; |
| } |
| |
| // Get the first operand. |
| uint32_t value = ReadCoreReg (Rn, &success); |
| if (!success) |
| return false; |
| // Get the Rm register content. |
| uint32_t val = ReadCoreReg (Rm, &success); |
| if (!success) |
| return false; |
| |
| // Get the shift amount. |
| uint32_t amt = Bits32(val, 7, 0); |
| |
| uint32_t result = Shift_C(value, shift_type, amt, APSR_C, carry); |
| |
| // The context specifies that an immediate is to be moved into Rd. |
| EmulateInstruction::Context context; |
| context.type = EmulateInstruction::eContextImmediate; |
| context.SetNoArgs (); |
| |
| if (!WriteCoreRegOptionalFlags(context, result, Rd, setflags, carry)) |
| return false; |
| } |
| return true; |
| } |
| |
| // LDM loads multiple registers from consecutive memory locations, using an |
| // address from a base register. Optionally the address just above the highest of those locations |
| // can be written back to the base register. |
| bool |
| EmulateInstructionARM::EmulateLDM (ARMEncoding encoding) |
| { |
| #if 0 |
| // ARM pseudo code... |
| if ConditionPassed() |
| EncodingSpecificOperations(); NullCheckIfThumbEE (n); |
| address = R[n]; |
| |
| for i = 0 to 14 |
| if registers<i> == '1' then |
| R[i] = MemA[address, 4]; address = address + 4; |
| if registers<15> == '1' then |
| LoadWritePC (MemA[address, 4]); |
| |
| if wback && registers<n> == '0' then R[n] = R[n] + 4 * BitCount (registers); |
| if wback && registers<n> == '1' then R[n] = bits(32) UNKNOWN; // Only possible for encoding A1 |
| |
| #endif |
| |
| bool success = false; |
| const uint32_t opcode = OpcodeAsUnsigned (&success); |
| if (!success) |
| return false; |
| |
| if (ConditionPassed()) |
| { |
| uint32_t n; |
| uint32_t registers = 0; |
| bool wback; |
| const uint32_t addr_byte_size = GetAddressByteSize(); |
| switch (encoding) |
| { |
| case eEncodingT1: |
| // n = UInt(Rn); registers = ’00000000’:register_list; wback = (registers<n> == ’0’); |
| n = Bits32 (opcode, 10, 8); |
| registers = Bits32 (opcode, 7, 0); |
| registers = registers & 0x00ff; // Make sure the top 8 bits are zeros. |
| wback = BitIsClear (registers, n); |
| // if BitCount(registers) < 1 then UNPREDICTABLE; |
| if (BitCount(registers) < 1) |
| return false; |
| break; |
| case eEncodingT2: |
| // if W == ’1’ && Rn == ’1101’ then SEE POP; |
| // n = UInt(Rn); registers = P:M:’0’:register_list; wback = (W == ’1’); |
| n = Bits32 (opcode, 19, 16); |
| registers = Bits32 (opcode, 15, 0); |
| registers = registers & 0xdfff; // Make sure bit 13 is zero. |
| wback = BitIsSet (opcode, 21); |
| |
| // if n == 15 || BitCount(registers) < 2 || (P == ’1’ && M == ’1’) then UNPREDICTABLE; |
| if ((n == 15) |
| || (BitCount (registers) < 2) |
| || (BitIsSet (opcode, 14) && BitIsSet (opcode, 15))) |
| return false; |
| |
| // if registers<15> == ’1’ && InITBlock() && !LastInITBlock() then UNPREDICTABLE; |
| if (BitIsSet (registers, 15) && InITBlock() && !LastInITBlock()) |
| return false; |
| |
| // if wback && registers<n> == ’1’ then UNPREDICTABLE; |
| if (wback |
| && BitIsSet (registers, n)) |
| return false; |
| break; |
| |
| case eEncodingA1: |
| n = Bits32 (opcode, 19, 16); |
| registers = Bits32 (opcode, 15, 0); |
| wback = BitIsSet (opcode, 21); |
| if ((n == 15) |
| || (BitCount (registers) < 1)) |
| return false; |
| break; |
| default: |
| return false; |
| } |
| |
| int32_t offset = 0; |
| const addr_t base_address = ReadRegisterUnsigned (eRegisterKindDWARF, dwarf_r0 + n, 0, &success); |
| if (!success) |
| return false; |
| |
| EmulateInstruction::Context context; |
| context.type = EmulateInstruction::eContextRegisterPlusOffset; |
| Register dwarf_reg; |
| dwarf_reg.SetRegister (eRegisterKindDWARF, dwarf_r0 + n); |
| context.SetRegisterPlusOffset (dwarf_reg, offset); |
| |
| for (int i = 0; i < 14; ++i) |
| { |
| if (BitIsSet (registers, i)) |
| { |
| context.type = EmulateInstruction::eContextRegisterPlusOffset; |
| context.SetRegisterPlusOffset (dwarf_reg, offset); |
| if (wback && (n == 13)) // Pop Instruction |
| context.type = EmulateInstruction::eContextPopRegisterOffStack; |
| |
| // R[i] = MemA [address, 4]; address = address + 4; |
| uint32_t data = MemARead (context, base_address + offset, addr_byte_size, 0, &success); |
| if (!success) |
| return false; |
| |
| if (!WriteRegisterUnsigned (context, eRegisterKindDWARF, dwarf_r0 + i, data)) |
| return false; |
| |
| offset += addr_byte_size; |
| } |
| } |
| |
| if (BitIsSet (registers, 15)) |
| { |
| //LoadWritePC (MemA [address, 4]); |
| context.type = EmulateInstruction::eContextRegisterPlusOffset; |
| context.SetRegisterPlusOffset (dwarf_reg, offset); |
| uint32_t data = MemARead (context, base_address + offset, addr_byte_size, 0, &success); |
| if (!success) |
| return false; |
| // In ARMv5T and above, this is an interworking branch. |
| if (!LoadWritePC(context, data)) |
| return false; |
| } |
| |
| if (wback && BitIsClear (registers, n)) |
| { |
| // R[n] = R[n] + 4 * BitCount (registers) |
| int32_t offset = addr_byte_size * BitCount (registers); |
| context.type = EmulateInstruction::eContextAdjustBaseRegister; |
| context.SetRegisterPlusOffset (dwarf_reg, offset); |
| |
| if (!WriteRegisterUnsigned (context, eRegisterKindDWARF, dwarf_r0 + n, base_address + offset)) |
| return false; |
| } |
| if (wback && BitIsSet (registers, n)) |
| // R[n] bits(32) UNKNOWN; |
| return WriteBits32Unknown (n); |
| } |
| return true; |
| } |
| |
| // LDMDA loads multiple registers from consecutive memory locations using an address from a base registers. |
| // The consecutive memorty locations end at this address and the address just below the lowest of those locations |
| // can optionally be written back tot he base registers. |
| bool |
| EmulateInstructionARM::EmulateLDMDA (ARMEncoding encoding) |
| { |
| #if 0 |
| // ARM pseudo code... |
| if ConditionPassed() then |
| EncodingSpecificOperations(); |
| address = R[n] - 4*BitCount(registers) + 4; |
| |
| for i = 0 to 14 |
| if registers<i> == ’1’ then |
| R[i] = MemA[address,4]; address = address + 4; |
| |
| if registers<15> == ’1’ then |
| LoadWritePC(MemA[address,4]); |
| |
| if wback && registers<n> == ’0’ then R[n] = R[n] - 4*BitCount(registers); |
| if wback && registers<n> == ’1’ then R[n] = bits(32) UNKNOWN; |
| #endif |
| |
| bool success = false; |
| const uint32_t opcode = OpcodeAsUnsigned (&success); |
| if (!success) |
| return false; |
| |
| if (ConditionPassed()) |
| { |
| uint32_t n; |
| uint32_t registers = 0; |
| bool wback; |
| const uint32_t addr_byte_size = GetAddressByteSize(); |
| |
| // EncodingSpecificOperations(); |
| switch (encoding) |
| { |
| case eEncodingA1: |
| // n = UInt(Rn); registers = register_list; wback = (W == ’1’); |
| n = Bits32 (opcode, 19, 16); |
| registers = Bits32 (opcode, 15, 0); |
| wback = BitIsSet (opcode, 21); |
| |
| // if n == 15 || BitCount(registers) < 1 then UNPREDICTABLE; |
| if ((n == 15) || (BitCount (registers) < 1)) |
| return false; |
| |
| break; |
| |
| default: |
| return false; |
| } |
| // address = R[n] - 4*BitCount(registers) + 4; |
| |
| int32_t offset = 0; |
| addr_t address = ReadRegisterUnsigned (eRegisterKindDWARF, dwarf_r0 + n, 0, &success); |
| |
| if (!success) |
| return false; |
| |
| address = address - (addr_byte_size * BitCount (registers)) + addr_byte_size; |
| |
| EmulateInstruction::Context context; |
| context.type = EmulateInstruction::eContextRegisterPlusOffset; |
| Register dwarf_reg; |
| dwarf_reg.SetRegister (eRegisterKindDWARF, dwarf_r0 + n); |
| context.SetRegisterPlusOffset (dwarf_reg, offset); |
| |
| // for i = 0 to 14 |
| for (int i = 0; i < 14; ++i) |
| { |
| // if registers<i> == ’1’ then |
| if (BitIsSet (registers, i)) |
| { |
| // R[i] = MemA[address,4]; address = address + 4; |
| context.SetRegisterPlusOffset (dwarf_reg, offset); |
| uint32_t data = MemARead (context, address + offset, addr_byte_size, 0, &success); |
| if (!success) |
| return false; |
| if (!WriteRegisterUnsigned (context, eRegisterKindDWARF, dwarf_r0 + i, data)) |
| return false; |
| offset += addr_byte_size; |
| } |
| } |
| |
| // if registers<15> == ’1’ then |
| // LoadWritePC(MemA[address,4]); |
| if (BitIsSet (registers, 15)) |
| { |
| context.SetRegisterPlusOffset (dwarf_reg, offset); |
| uint32_t data = MemARead (context, address + offset, addr_byte_size, 0, &success); |
| if (!success) |
| return false; |
| // In ARMv5T and above, this is an interworking branch. |
| if (!LoadWritePC(context, data)) |
| return false; |
| } |
| |
| // if wback && registers<n> == ’0’ then R[n] = R[n] - 4*BitCount(registers); |
| if (wback && BitIsClear (registers, n)) |
| { |
| addr_t addr = ReadRegisterUnsigned (eRegisterKindDWARF, dwarf_r0 + n, 0, &success); |
| if (!success) |
| return false; |
| |
| offset = (addr_byte_size * BitCount (registers)) * -1; |
| context.type = EmulateInstruction::eContextAdjustBaseRegister; |
| context.SetImmediateSigned (offset); |
| addr = addr + offset; |
| if (!WriteRegisterUnsigned (context, eRegisterKindDWARF, dwarf_r0 + n, addr)) |
| return false; |
| } |
| |
| // if wback && registers<n> == ’1’ then R[n] = bits(32) UNKNOWN; |
| if (wback && BitIsSet (registers, n)) |
| return WriteBits32Unknown (n); |
| } |
| return true; |
| } |
| |
| // LDMDB loads multiple registers from consecutive memory locations using an address from a base register. The |
| // consecutive memory lcoations end just below this address, and the address of the lowest of those locations can |
| // be optionally written back to the base register. |
| bool |
| EmulateInstructionARM::EmulateLDMDB (ARMEncoding encoding) |
| { |
| #if 0 |
| // ARM pseudo code... |
| if ConditionPassed() then |
| EncodingSpecificOperations(); NullCheckIfThumbEE(n); |
| address = R[n] - 4*BitCount(registers); |
| |
| for i = 0 to 14 |
| if registers<i> == ’1’ then |
| R[i] = MemA[address,4]; address = address + 4; |
| if registers<15> == ’1’ then |
| LoadWritePC(MemA[address,4]); |
| |
| if wback && registers<n> == ’0’ then R[n] = R[n] - 4*BitCount(registers); |
| if wback && registers<n> == ’1’ then R[n] = bits(32) UNKNOWN; // Only possible for encoding A1 |
| #endif |
| |
| bool success = false; |
| const uint32_t opcode = OpcodeAsUnsigned (&success); |
| if (!success) |
| return false; |
| |
| if (ConditionPassed()) |
| { |
| uint32_t n; |
| uint32_t registers = 0; |
| bool wback; |
| const uint32_t addr_byte_size = GetAddressByteSize(); |
| switch (encoding) |
| { |
| case eEncodingT1: |
| // n = UInt(Rn); registers = P:M:’0’:register_list; wback = (W == ’1’); |
| n = Bits32 (opcode, 19, 16); |
| registers = Bits32 (opcode, 15, 0); |
| registers = registers & 0xdfff; // Make sure bit 13 is a zero. |
| wback = BitIsSet (opcode, 21); |
| |
| // if n == 15 || BitCount(registers) < 2 || (P == ’1’ && M == ’1’) then UNPREDICTABLE; |
| if ((n == 15) |
| || (BitCount (registers) < 2) |
| || (BitIsSet (opcode, 14) && BitIsSet (opcode, 15))) |
| return false; |
| |
| // if registers<15> == ’1’ && InITBlock() && !LastInITBlock() then UNPREDICTABLE; |
| if (BitIsSet (registers, 15) && InITBlock() && !LastInITBlock()) |
| return false; |
| |
| // if wback && registers<n> == ’1’ then UNPREDICTABLE; |
| if (wback && BitIsSet (registers, n)) |
| return false; |
| |
| break; |
| |
| case eEncodingA1: |
| // n = UInt(Rn); registers = register_list; wback = (W == ’1’); |
| n = Bits32 (opcode, 19, 16); |
| registers = Bits32 (opcode, 15, 0); |
| wback = BitIsSet (opcode, 21); |
| |
| // if n == 15 || BitCount(registers) < 1 then UNPREDICTABLE; |
| if ((n == 15) || (BitCount (registers) < 1)) |
| return false; |
| |
| break; |
| |
| default: |
| return false; |
| } |
| |
| // address = R[n] - 4*BitCount(registers); |
| |
| int32_t offset = 0; |
| addr_t address = ReadRegisterUnsigned (eRegisterKindDWARF, dwarf_r0 + n, 0, &success); |
| |
| if (!success) |
| return false; |
| |
| address = address - (addr_byte_size * BitCount (registers)); |
| EmulateInstruction::Context context; |
| context.type = EmulateInstruction::eContextRegisterPlusOffset; |
| Register dwarf_reg; |
| dwarf_reg.SetRegister (eRegisterKindDWARF, dwarf_r0 + n); |
| context.SetRegisterPlusOffset (dwarf_reg, offset); |
| |
| for (int i = 0; i < 14; ++i) |
| { |
| if (BitIsSet (registers, i)) |
| { |
| // R[i] = MemA[address,4]; address = address + 4; |
| context.SetRegisterPlusOffset (dwarf_reg, offset); |
| uint32_t data = MemARead (context, address + offset, addr_byte_size, 0, &success); |
| if (!success) |
| return false; |
| |
| if (!WriteRegisterUnsigned (context, eRegisterKindDWARF, dwarf_r0 + i, data)) |
| return false; |
| |
| offset += addr_byte_size; |
| } |
| } |
| |
| // if registers<15> == ’1’ then |
| // LoadWritePC(MemA[address,4]); |
| if (BitIsSet (registers, 15)) |
| { |
| context.SetRegisterPlusOffset (dwarf_reg, offset); |
| uint32_t data = MemARead (context, address + offset, addr_byte_size, 0, &success); |
| if (!success) |
| return false; |
| // In ARMv5T and above, this is an interworking branch. |
| if (!LoadWritePC(context, data)) |
| return false; |
| } |
| |
| // if wback && registers<n> == ’0’ then R[n] = R[n] - 4*BitCount(registers); |
| if (wback && BitIsClear (registers, n)) |
| { |
| addr_t addr = ReadRegisterUnsigned (eRegisterKindDWARF, dwarf_r0 + n, 0, &success); |
| if (!success) |
| return false; |
| |
| offset = (addr_byte_size * BitCount (registers)) * -1; |
| context.type = EmulateInstruction::eContextAdjustBaseRegister; |
| context.SetImmediateSigned (offset); |
| addr = addr + offset; |
| if (!WriteRegisterUnsigned (context, eRegisterKindDWARF, dwarf_r0 + n, addr)) |
| return false; |
| } |
| |
| // if wback && registers<n> == ’1’ then R[n] = bits(32) UNKNOWN; // Only possible for encoding A1 |
| if (wback && BitIsSet (registers, n)) |
| return WriteBits32Unknown (n); |
| } |
| return true; |
| } |
| |
| // LDMIB loads multiple registers from consecutive memory locations using an address from a base register. The |
| // consecutive memory locations start just above this address, and thea ddress of the last of those locations can |
| // optinoally be written back to the base register. |
| bool |
| EmulateInstructionARM::EmulateLDMIB (ARMEncoding encoding) |
| { |
| #if 0 |
| if ConditionPassed() then |
| EncodingSpecificOperations(); |
| address = R[n] + 4; |
| |
| for i = 0 to 14 |
| if registers<i> == ’1’ then |
| R[i] = MemA[address,4]; address = address + 4; |
| if registers<15> == ’1’ then |
| LoadWritePC(MemA[address,4]); |
| |
| if wback && registers<n> == ’0’ then R[n] = R[n] + 4*BitCount(registers); |
| if wback && registers<n> == ’1’ then R[n] = bits(32) UNKNOWN; |
| #endif |
| |
| bool success = false; |
| const uint32_t opcode = OpcodeAsUnsigned (&success); |
| if (!success) |
| return false; |
| |
| if (ConditionPassed()) |
| { |
| uint32_t n; |
| uint32_t registers = 0; |
| bool wback; |
| const uint32_t addr_byte_size = GetAddressByteSize(); |
| switch (encoding) |
| { |
| case eEncodingA1: |
| // n = UInt(Rn); registers = register_list; wback = (W == ’1’); |
| n = Bits32 (opcode, 19, 16); |
| registers = Bits32 (opcode, 15, 0); |
| wback = BitIsSet (opcode, 21); |
| |
| // if n == 15 || BitCount(registers) < 1 then UNPREDICTABLE; |
| if ((n == 15) || (BitCount (registers) < 1)) |
| return false; |
| |
| break; |
| default: |
| return false; |
| } |
| // address = R[n] + 4; |
| |
| int32_t offset = 0; |
| addr_t address = ReadRegisterUnsigned (eRegisterKindDWARF, dwarf_r0 + n, 0, &success); |
| |
| if (!success) |
| return false; |
| |
| address = address + addr_byte_size; |
| |
| EmulateInstruction::Context context; |
| context.type = EmulateInstruction::eContextRegisterPlusOffset; |
| Register dwarf_reg; |
| dwarf_reg.SetRegister (eRegisterKindDWARF, dwarf_r0 + n); |
| context.SetRegisterPlusOffset (dwarf_reg, offset); |
| |
| for (int i = 0; i < 14; ++i) |
| { |
| if (BitIsSet (registers, i)) |
| { |
| // R[i] = MemA[address,4]; address = address + 4; |
| |
| context.SetRegisterPlusOffset (dwarf_reg, offset); |
| uint32_t data = MemARead (context, address + offset, addr_byte_size, 0, &success); |
| if (!success) |
| return false; |
| |
| if (!WriteRegisterUnsigned (context, eRegisterKindDWARF, dwarf_r0 + i, data)) |
| return false; |
| |
| offset += addr_byte_size; |
| } |
| } |
| |
| // if registers<15> == ’1’ then |
| // LoadWritePC(MemA[address,4]); |
| if (BitIsSet (registers, 15)) |
| { |
| context.SetRegisterPlusOffset (dwarf_reg, offset); |
| uint32_t data = MemARead (context, address + offset, addr_byte_size, 0, &success); |
| if (!success) |
| return false; |
| // In ARMv5T and above, this is an interworking branch. |
| if (!LoadWritePC(context, data)) |
| return false; |
| } |
| |
| // if wback && registers<n> == ’0’ then R[n] = R[n] + 4*BitCount(registers); |
| if (wback && BitIsClear (registers, n)) |
| { |
| addr_t addr = ReadRegisterUnsigned (eRegisterKindDWARF, dwarf_r0 + n, 0, &success); |
| if (!success) |
| return false; |
| |
| offset = addr_byte_size * BitCount (registers); |
| context.type = EmulateInstruction::eContextAdjustBaseRegister; |
| context.SetImmediateSigned (offset); |
| addr = addr + offset; |
| if (!WriteRegisterUnsigned (context, eRegisterKindDWARF, dwarf_r0 + n, addr)) |
| return false; |
| } |
| |
| // if wback && registers<n> == ’1’ then R[n] = bits(32) UNKNOWN; // Only possible for encoding A1 |
| if (wback && BitIsSet (registers, n)) |
| return WriteBits32Unknown (n); |
| } |
| return true; |
| } |
| |
| // Load Register (immediate) calculates an address from a base register value and |
| // an immediate offset, loads a word from memory, and writes to a register. |
| // LDR (immediate, Thumb) |
| bool |
| EmulateInstructionARM::EmulateLDRRtRnImm (ARMEncoding encoding) |
| { |
| #if 0 |
| // ARM pseudo code... |
| if (ConditionPassed()) |
| { |
| EncodingSpecificOperations(); NullCheckIfThumbEE(15); |
| offset_addr = if add then (R[n] + imm32) else (R[n] - imm32); |
| address = if index then offset_addr else R[n]; |
| data = MemU[address,4]; |
| if wback then R[n] = offset_addr; |
| if t == 15 then |
| if address<1:0> == '00' then LoadWritePC(data); else UNPREDICTABLE; |
| elsif UnalignedSupport() || address<1:0> = '00' then |
| R[t] = data; |
| else R[t] = bits(32) UNKNOWN; // Can only apply before ARMv7 |
| } |
| #endif |
| |
| bool success = false; |
| const uint32_t opcode = OpcodeAsUnsigned (&success); |
| if (!success) |
| return false; |
| |
| if (ConditionPassed()) |
| { |
| uint32_t Rt; // the destination register |
| uint32_t Rn; // the base register |
| uint32_t imm32; // the immediate offset used to form the address |
| addr_t offset_addr; // the offset address |
| addr_t address; // the calculated address |
| uint32_t data; // the literal data value from memory load |
| bool add, index, wback; |
| switch (encoding) { |
| case eEncodingT1: |
| Rt = Bits32(opcode, 5, 3); |
| Rn = Bits32(opcode, 2, 0); |
| imm32 = Bits32(opcode, 10, 6) << 2; // imm32 = ZeroExtend(imm5:'00', 32); |
| // index = TRUE; add = TRUE; wback = FALSE |
| add = true; |
| index = true; |
| wback = false; |
| break; |
| default: |
| return false; |
| } |
| uint32_t base = ReadRegisterUnsigned(eRegisterKindDWARF, dwarf_r0 + Rn, 0, &success); |
| if (!success) |
| return false; |
| if (add) |
| offset_addr = base + imm32; |
| else |
| offset_addr = base - imm32; |
| |
| address = (index ? offset_addr : base); |
| |
| if (wback) |
| { |
| EmulateInstruction::Context ctx; |
| ctx.type = EmulateInstruction::eContextRegisterPlusOffset; |
| Register dwarf_reg; |
| dwarf_reg.SetRegister (eRegisterKindDWARF, dwarf_r0 + Rn); |
| ctx.SetRegisterPlusOffset (dwarf_reg, (int32_t) (offset_addr - base)); |
| |
| if (!WriteRegisterUnsigned (ctx, eRegisterKindDWARF, dwarf_r0 + Rn, offset_addr)) |
| return false; |
| } |
| |
| // Prepare to write to the Rt register. |
| EmulateInstruction::Context context; |
| context.type = EmulateInstruction::eContextImmediate; |
| context.SetNoArgs (); |
| |
| // Read memory from the address. |
| data = MemURead(context, address, 4, 0, &success); |
| if (!success) |
| return false; |
| |
| if (Rt == 15) |
| { |
| if (Bits32(address, 1, 0) == 0) |
| { |
| if (!LoadWritePC(context, data)) |
| return false; |
| } |
| else |
| return false; |
| } |
| else if (UnalignedSupport() || Bits32(address, 1, 0) == 0) |
| { |
| if (!WriteRegisterUnsigned (context, eRegisterKindDWARF, dwarf_r0 + Rt, data)) |
| return false; |
| } |
| else |
| return false; |
| } |
| return true; |
| } |
| |
| // STM (Store Multiple Increment After) stores multiple registers to consecutive memory locations using an address |
| // from a base register. The consecutive memory locations start at this address, and teh address just above the last |
| // of those locations can optionally be written back to the base register. |
| bool |
| EmulateInstructionARM::EmulateSTM (ARMEncoding encoding) |
| { |
| #if 0 |
| if ConditionPassed() then |
| EncodingSpecificOperations(); NullCheckIfThumbEE(n); |
| address = R[n]; |
| |
| for i = 0 to 14 |
| if registers<i> == ’1’ then |
| if i == n && wback && i != LowestSetBit(registers) then |
| MemA[address,4] = bits(32) UNKNOWN; // Only possible for encodings T1 and A1 |
| else |
| MemA[address,4] = R[i]; |
| address = address + 4; |
| |
| if registers<15> == ’1’ then // Only possible for encoding A1 |
| MemA[address,4] = PCStoreValue(); |
| if wback then R[n] = R[n] + 4*BitCount(registers); |
| #endif |
| |
| bool success = false; |
| const uint32_t opcode = OpcodeAsUnsigned (&success); |
| if (!success) |
| return false; |
| |
| if (ConditionPassed ()) |
| { |
| uint32_t n; |
| uint32_t registers = 0; |
| bool wback; |
| const uint32_t addr_byte_size = GetAddressByteSize(); |
| |
| // EncodingSpecificOperations(); NullCheckIfThumbEE(n); |
| switch (encoding) |
| { |
| case eEncodingT1: |
| // n = UInt(Rn); registers = ’00000000’:register_list; wback = TRUE; |
| n = Bits32 (opcode, 10, 8); |
| registers = Bits32 (opcode, 7, 0); |
| registers = registers & 0x00ff; // Make sure the top 8 bits are zeros. |
| wback = true; |
| |
| // if BitCount(registers) < 1 then UNPREDICTABLE; |
| if (BitCount (registers) < 1) |
| return false; |
| |
| break; |
| |
| case eEncodingT2: |
| // n = UInt(Rn); registers = ’0’:M:’0’:register_list; wback = (W == ’1’); |
| n = Bits32 (opcode, 19, 16); |
| registers = Bits32 (opcode, 15, 0); |
| registers = registers & 0x5fff; // Make sure bits 15 & 13 are zeros. |
| wback = BitIsSet (opcode, 21); |
| |
| // if n == 15 || BitCount(registers) < 2 then UNPREDICTABLE; |
| if ((n == 15) || (BitCount (registers) < 2)) |
| return false; |
| |
| // if wback && registers<n> == ’1’ then UNPREDICTABLE; |
| if (wback && BitIsSet (registers, n)) |
| return false; |
| |
| break; |
| |
| case eEncodingA1: |
| // n = UInt(Rn); registers = register_list; wback = (W == ’1’); |
| n = Bits32 (opcode, 19, 16); |
| registers = Bits32 (opcode, 15, 0); |
| wback = BitIsSet (opcode, 21); |
| |
| // if n == 15 || BitCount(registers) < 1 then UNPREDICTABLE; |
| if ((n == 15) || (BitCount (registers) < 1)) |
| return false; |
| |
| break; |
| |
| default: |
| return false; |
| } |
| |
| // address = R[n]; |
| int32_t offset = 0; |
| const addr_t address = ReadRegisterUnsigned (eRegisterKindDWARF, dwarf_r0 + n, 0, &success); |
| if (!success) |
| return false; |
| |
| EmulateInstruction::Context context; |
| context.type = EmulateInstruction::eContextRegisterStore; |
| Register base_reg; |
| base_reg.SetRegister (eRegisterKindDWARF, dwarf_r0 + n); |
| |
| // for i = 0 to 14 |
| for (int i = 0; i < 14; ++i) |
| { |
| int lowest_set_bit = 14; |
| // if registers<i> == ’1’ then |
| if (BitIsSet (registers, i)) |
| { |
| if (i < lowest_set_bit) |
| lowest_set_bit = i; |
| // if i == n && wback && i != LowestSetBit(registers) then |
| if ((i == n) && wback && (i != lowest_set_bit)) |
| // MemA[address,4] = bits(32) UNKNOWN; // Only possible for encodings T1 and A1 |
| WriteBits32UnknownToMemory (address + offset); |
| else |
| { |
| // MemA[address,4] = R[i]; |
| uint32_t data = ReadRegisterUnsigned (eRegisterKindDWARF, dwarf_r0 + i, 0, &success); |
| if (!success) |
| return false; |
| |
| Register data_reg; |
| data_reg.SetRegister (eRegisterKindDWARF, dwarf_r0 + i); |
| context.SetRegisterToRegisterPlusOffset (data_reg, base_reg, offset); |
| if (!MemAWrite (context, address + offset, data, addr_byte_size)) |
| return false; |
| } |
| |
| // address = address + 4; |
| offset += addr_byte_size; |
| } |
| } |
| |
| // if registers<15> == ’1’ then // Only possible for encoding A1 |
| // MemA[address,4] = PCStoreValue(); |
| if (BitIsSet (registers, 15)) |
| { |
| Register pc_reg; |
| pc_reg.SetRegister (eRegisterKindDWARF, dwarf_pc); |
| context.SetRegisterPlusOffset (pc_reg, 8); |
| const uint32_t pc = ReadRegisterUnsigned(eRegisterKindGeneric, LLDB_REGNUM_GENERIC_PC, 0, &success); |
| if (!success) |
| return false; |
| |
| if (!MemAWrite (context, address + offset, pc + 8, addr_byte_size)) |
| return false; |
| } |
| |
| // if wback then R[n] = R[n] + 4*BitCount(registers); |
| if (wback) |
| { |
| offset = addr_byte_size * BitCount (registers); |
| context.type = EmulateInstruction::eContextAdjustBaseRegister; |
| context.SetImmediateSigned (offset); |
| addr_t data = address + offset; |
| if (!WriteRegisterUnsigned (context, eRegisterKindDWARF, dwarf_r0 + n, data)) |
| return false; |
| } |
| } |
| return true; |
| } |
| |
| // STMDA (Store Multiple Decrement After) stores multiple registers to consecutive memory locations using an address |
| // from a base register. The consecutive memory locations end at this address, and the address just below the lowest |
| // of those locations can optionally be written back to the base register. |
| bool |
| EmulateInstructionARM::EmulateSTMDA (ARMEncoding encoding) |
| { |
| #if 0 |
| if ConditionPassed() then |
| EncodingSpecificOperations(); |
| address = R[n] - 4*BitCount(registers) + 4; |
| |
| for i = 0 to 14 |
| if registers<i> == ’1’ then |
| if i == n && wback && i != LowestSetBit(registers) then |
| MemA[address,4] = bits(32) UNKNOWN; |
| else |
| MemA[address,4] = R[i]; |
| address = address + 4; |
| |
| if registers<15> == ’1’ then |
| MemA[address,4] = PCStoreValue(); |
| |
| if wback then R[n] = R[n] - 4*BitCount(registers); |
| #endif |
| |
| bool success = false; |
| const uint32_t opcode = OpcodeAsUnsigned (&success); |
| if (!success) |
| return false; |
| |
| if (ConditionPassed ()) |
| { |
| uint32_t n; |
| uint32_t registers = 0; |
| bool wback; |
| const uint32_t addr_byte_size = GetAddressByteSize(); |
| |
| // EncodingSpecificOperations(); |
| switch (encoding) |
| { |
| case eEncodingA1: |
| // n = UInt(Rn); registers = register_list; wback = (W == ’1’); |
| n = Bits32 (opcode, 19, 16); |
| registers = Bits32 (opcode, 15, 0); |
| wback = BitIsSet (opcode, 21); |
| |
| // if n == 15 || BitCount(registers) < 1 then UNPREDICTABLE; |
| if ((n == 15) || (BitCount (registers) < 1)) |
| return false; |
| break; |
| default: |
| return false; |
| } |
| |
| // address = R[n] - 4*BitCount(registers) + 4; |
| int32_t offset = 0; |
| addr_t address = ReadRegisterUnsigned (eRegisterKindDWARF, dwarf_r0 + n, 0, &success); |
| if (!success) |
| return false; |
| |
| address = address - (addr_byte_size * BitCount (registers)) + 4; |
| |
| EmulateInstruction::Context context; |
| context.type = EmulateInstruction::eContextRegisterStore; |
| Register base_reg; |
| base_reg.SetRegister (eRegisterKindDWARF, dwarf_r0 + n); |
| |
| // for i = 0 to 14 |
| for (int i = 0; i < 14; ++i) |
| { |
| int lowest_bit_set = 14; |
| // if registers<i> == ’1’ then |
| if (BitIsSet (registers, i)) |
| { |
| if (i < lowest_bit_set) |
| lowest_bit_set = i; |
| //if i == n && wback && i != LowestSetBit(registers) then |
| if ((i == n) && wback && (i != lowest_bit_set)) |
| // MemA[address,4] = bits(32) UNKNOWN; |
| WriteBits32UnknownToMemory (address + offset); |
| else |
| { |
| // MemA[address,4] = R[i]; |
| uint32_t data = ReadRegisterUnsigned (eRegisterKindDWARF, dwarf_r0 + i, 0, &success); |
| if (!success) |
| return false; |
| |
| Register data_reg; |
| data_reg.SetRegister (eRegisterKindDWARF, dwarf_r0 + i); |
| context.SetRegisterToRegisterPlusOffset (data_reg, base_reg, offset); |
| if (!MemAWrite (context, address + offset, data, addr_byte_size)) |
| return false; |
| } |
| |
| // address = address + 4; |
| offset += addr_byte_size; |
| } |
| } |
| |
| // if registers<15> == ’1’ then |
| // MemA[address,4] = PCStoreValue(); |
| if (BitIsSet (registers, 15)) |
| { |
| Register pc_reg; |
| pc_reg.SetRegister (eRegisterKindDWARF, dwarf_pc); |
| context.SetRegisterPlusOffset (pc_reg, 8); |
| const uint32_t pc = ReadRegisterUnsigned(eRegisterKindGeneric, LLDB_REGNUM_GENERIC_PC, 0, &success); |
| if (!success) |
| return false; |
| |
| if (!MemAWrite (context, address + offset, pc + 8, addr_byte_size)) |
| return false; |
| } |
| |
| // if wback then R[n] = R[n] - 4*BitCount(registers); |
| if (wback) |
| { |
| offset = (addr_byte_size * BitCount (registers)) * -1; |
| context.type = EmulateInstruction::eContextAdjustBaseRegister; |
| context.SetImmediateSigned (offset); |
| addr_t data = address + offset; |
| if (!WriteRegisterUnsigned (context, eRegisterKindDWARF, dwarf_r0 + n, data)) |
| return false; |
| } |
| } |
| return true; |
| } |
| |
| // STMDB (Store Multiple Decrement Before) stores multiple registers to consecutive memory locations using an address |
| // from a base register. The consecutive memory locations end just below this address, and the address of the first of |
| // those locations can optionally be written back to the base register. |
| bool |
| EmulateInstructionARM::EmulateSTMDB (ARMEncoding encoding) |
| { |
| #if 0 |
| if ConditionPassed() then |
| EncodingSpecificOperations(); NullCheckIfThumbEE(n); |
| address = R[n] - 4*BitCount(registers); |
| |
| for i = 0 to 14 |
| if registers<i> == ’1’ then |
| if i == n && wback && i != LowestSetBit(registers) then |
| MemA[address,4] = bits(32) UNKNOWN; // Only possible for encoding A1 |
| else |
| MemA[address,4] = R[i]; |
| address = address + 4; |
| |
| if registers<15> == ’1’ then // Only possible for encoding A1 |
| MemA[address,4] = PCStoreValue(); |
| |
| if wback then R[n] = R[n] - 4*BitCount(registers); |
| #endif |
| |
| |
| bool success = false; |
| const uint32_t opcode = OpcodeAsUnsigned (&success); |
| if (!success) |
| return false; |
| |
| if (ConditionPassed ()) |
| { |
| uint32_t n; |
| uint32_t registers = 0; |
| bool wback; |
| const uint32_t addr_byte_size = GetAddressByteSize(); |
| |
| // EncodingSpecificOperations(); NullCheckIfThumbEE(n); |
| switch (encoding) |
| { |
| case eEncodingT1: |
| // if W == ’1’ && Rn == ’1101’ then SEE PUSH; |
| if ((BitIsSet (opcode, 21)) && (Bits32 (opcode, 19, 16) == 13)) |
| { |
| // See PUSH |
| } |
| // n = UInt(Rn); registers = ’0’:M:’0’:register_list; wback = (W == ’1’); |
| n = Bits32 (opcode, 19, 16); |
| registers = Bits32 (opcode, 15, 0); |
| registers = registers & 0x5fff; // Make sure bits 15 & 13 are zeros. |
| wback = BitIsSet (opcode, 21); |
| // if n == 15 || BitCount(registers) < 2 then UNPREDICTABLE; |
| if ((n == 15) || BitCount (registers) < 2) |
| return false; |
| // if wback && registers<n> == ’1’ then UNPREDICTABLE; |
| if (wback && BitIsSet (registers, n)) |
| return false; |
| break; |
| |
| case eEncodingA1: |
| // if W == ’1’ && Rn == ’1101’ && BitCount(register_list) >= 2 then SEE PUSH; |
| if (BitIsSet (opcode, 21) && (Bits32 (opcode, 19, 16) == 13) && BitCount (Bits32 (opcode, 15, 0)) >= 2) |
| { |
| // See Push |
| } |
| // n = UInt(Rn); registers = register_list; wback = (W == ’1’); |
| n = Bits32 (opcode, 19, 16); |
| registers = Bits32 (opcode, 15, 0); |
| wback = BitIsSet (opcode, 21); |
| // if n == 15 || BitCount(registers) < 1 then UNPREDICTABLE; |
| if ((n == 15) || BitCount (registers) < 1) |
| return false; |
| break; |
| |
| default: |
| return false; |
| } |
| |
| // address = R[n] - 4*BitCount(registers); |
| |
| int32_t offset = 0; |
| addr_t address = ReadRegisterUnsigned (eRegisterKindDWARF, dwarf_r0 + n, 0, &success); |
| if (!success) |
| return false; |
| |
| address = address - (addr_byte_size * BitCount (registers)); |
| |
| EmulateInstruction::Context context; |
| context.type = EmulateInstruction::eContextRegisterStore; |
| Register base_reg; |
| base_reg.SetRegister (eRegisterKindDWARF, dwarf_r0 + n); |
| |
| // for i = 0 to 14 |
| for (int i = 0; i < 14; ++i) |
| { |
| uint32_t lowest_set_bit = 14; |
| // if registers<i> == ’1’ then |
| if (BitIsSet (registers, i)) |
| { |
| if (i < lowest_set_bit) |
| lowest_set_bit = i; |
| // if i == n && wback && i != LowestSetBit(registers) then |
| if ((i == n) && wback && (i != lowest_set_bit)) |
| // MemA[address,4] = bits(32) UNKNOWN; // Only possible for encoding A1 |
| WriteBits32UnknownToMemory (address + offset); |
| else |
| { |
| // MemA[address,4] = R[i]; |
| uint32_t data = ReadRegisterUnsigned (eRegisterKindDWARF, dwarf_r0 + i, 0, &success); |
| if (!success) |
| return false; |
| |
| Register data_reg; |
| data_reg.SetRegister (eRegisterKindDWARF, dwarf_r0 + i); |
| context.SetRegisterToRegisterPlusOffset (data_reg, base_reg, offset); |
| if (!MemAWrite (context, address + offset, data, addr_byte_size)) |
| return false; |
| } |
| |
| // address = address + 4; |
| offset += addr_byte_size; |
| } |
| } |
| |
| // if registers<15> == ’1’ then // Only possible for encoding A1 |
| // MemA[address,4] = PCStoreValue(); |
| if (BitIsSet (registers, 15)) |
| { |
| Register pc_reg; |
| pc_reg.SetRegister (eRegisterKindDWARF, dwarf_pc); |
| context.SetRegisterPlusOffset (pc_reg, 8); |
| const uint32_t pc = ReadRegisterUnsigned(eRegisterKindGeneric, LLDB_REGNUM_GENERIC_PC, 0, &success); |
| if (!success) |
| return false; |
| |
| if (!MemAWrite (context, address + offset, pc + 8, addr_byte_size)) |
| return false; |
| } |
| |
| // if wback then R[n] = R[n] - 4*BitCount(registers); |
| if (wback) |
| { |
| offset = (addr_byte_size * BitCount (registers)) * -1; |
| context.type = EmulateInstruction::eContextAdjustBaseRegister; |
| context.SetImmediateSigned (offset); |
| addr_t data = address + offset; |
| if (!WriteRegisterUnsigned (context, eRegisterKindDWARF, dwarf_r0 + n, data)) |
| return false; |
| } |
| } |
| return true; |
| } |
| |
| // STMIB (Store Multiple Increment Before) stores multiple registers to consecutive memory locations using an address |
| // from a base register. The consecutive memory locations start just above this address, and the address of the last |
| // of those locations can optionally be written back to the base register. |
| bool |
| EmulateInstructionARM::EmulateSTMIB (ARMEncoding encoding) |
| { |
| #if 0 |
| if ConditionPassed() then |
| EncodingSpecificOperations(); |
| address = R[n] + 4; |
| |
| for i = 0 to 14 |
| if registers<i> == ’1’ then |
| if i == n && wback && i != LowestSetBit(registers) then |
| MemA[address,4] = bits(32) UNKNOWN; |
| else |
| MemA[address,4] = R[i]; |
| address = address + 4; |
| |
| if registers<15> == ’1’ then |
| MemA[address,4] = PCStoreValue(); |
| |
| if wback then R[n] = R[n] + 4*BitCount(registers); |
| #endif |
| |
| bool success = false; |
| const uint32_t opcode = OpcodeAsUnsigned (&success); |
| if (!success) |
| return false; |
| |
| if (ConditionPassed()) |
| { |
| uint32_t n; |
| uint32_t registers = 0; |
| bool wback; |
| const uint32_t addr_byte_size = GetAddressByteSize(); |
| |
| // EncodingSpecificOperations(); |
| switch (encoding) |
| { |
| case eEncodingA1: |
| // n = UInt(Rn); registers = register_list; wback = (W == ’1’); |
| n = Bits32 (opcode, 19, 16); |
| registers = Bits32 (opcode, 15, 0); |
| wback = BitIsSet (opcode, 21); |
| |
| // if n == 15 || BitCount(registers) < 1 then UNPREDICTABLE; |
| if ((n == 15) && (BitCount (registers) < 1)) |
| return false; |
| break; |
| default: |
| return false; |
| } |
| // address = R[n] + 4; |
| |
| int32_t offset = 0; |
| addr_t address = ReadRegisterUnsigned (eRegisterKindDWARF, dwarf_r0 + n, 0, &success); |
| if (!success) |
| return false; |
| |
| address = address + addr_byte_size; |
| |
| EmulateInstruction::Context context; |
| context.type = EmulateInstruction::eContextRegisterStore; |
| Register base_reg; |
| base_reg.SetRegister (eRegisterKindDWARF, dwarf_r0 + n); |
| |
| uint32_t lowest_set_bit = 14; |
| // for i = 0 to 14 |
| for (int i = 0; i < 14; ++i) |
| { |
| // if registers<i> == ’1’ then |
| if (BitIsSet (registers, i)) |
| { |
| if (i < lowest_set_bit) |
| lowest_set_bit = i; |
| // if i == n && wback && i != LowestSetBit(registers) then |
| if ((i == n) && wback && (i != lowest_set_bit)) |
| // MemA[address,4] = bits(32) UNKNOWN; |
| WriteBits32UnknownToMemory (address + offset); |
| // else |
| else |
| { |
| // MemA[address,4] = R[i]; |
| uint32_t data = ReadRegisterUnsigned (eRegisterKindDWARF, dwarf_r0 + i, 0, &success); |
| if (!success) |
| return false; |
| |
| Register data_reg; |
| data_reg.SetRegister (eRegisterKindDWARF, dwarf_r0 + i); |
| context.SetRegisterToRegisterPlusOffset (data_reg, base_reg, offset); |
| if (!MemAWrite (context, address + offset, data, addr_byte_size)) |
| return false; |
| } |
| |
| // address = address + 4; |
| offset += addr_byte_size; |
| } |
| } |
| |
| // if registers<15> == ’1’ then |
| // MemA[address,4] = PCStoreValue(); |
| if (BitIsSet (registers, 15)) |
| { |
| Register pc_reg; |
| pc_reg.SetRegister (eRegisterKindDWARF, dwarf_pc); |
| context.SetRegisterPlusOffset (pc_reg, 8); |
| const uint32_t pc = ReadRegisterUnsigned(eRegisterKindGeneric, LLDB_REGNUM_GENERIC_PC, 0, &success); |
| if (!success) |
| return false; |
| |
| if (!MemAWrite (context, address + offset, pc + 8, addr_byte_size)) |
| return false; |
| } |
| |
| // if wback then R[n] = R[n] + 4*BitCount(registers); |
| if (wback) |
| { |
| offset = addr_byte_size * BitCount (registers); |
| context.type = EmulateInstruction::eContextAdjustBaseRegister; |
| context.SetImmediateSigned (offset); |
| addr_t data = address + offset; |
| if (!WriteRegisterUnsigned (context, eRegisterKindDWARF, dwarf_r0 + n, data)) |
| return false; |
| } |
| } |
| return true; |
| } |
| |
| // STR (store immediate) calcualtes an address from a base register value and an immediate offset, and stores a word |
| // from a register to memory. It can use offset, post-indexed, or pre-indexed addressing. |
| bool |
| EmulateInstructionARM::EmulateSTRThumb (ARMEncoding encoding) |
| { |
| #if 0 |
| if ConditionPassed() then |
| EncodingSpecificOperations(); NullCheckIfThumbEE(n); |
| offset_addr = if add then (R[n] + imm32) else (R[n] - imm32); |
| address = if index then offset_addr else R[n]; |
| if UnalignedSupport() || address<1:0> == ’00’ then |
| MemU[address,4] = R[t]; |
| else // Can only occur before ARMv7 |
| MemU[address,4] = bits(32) UNKNOWN; |
| if wback then R[n] = offset_addr; |
| #endif |
| |
| bool success = false; |
| const uint32_t opcode = OpcodeAsUnsigned (&success); |
| if (!success) |
| return false; |
| |
| if (ConditionPassed()) |
| { |
| const uint32_t addr_byte_size = GetAddressByteSize(); |
| |
| uint32_t t; |
| uint32_t n; |
| uint32_t imm32; |
| bool index; |
| bool add; |
| bool wback; |
| // EncodingSpecificOperations (); NullCheckIfThumbEE(n); |
| switch (encoding) |
| { |
| case eEncodingT1: |
| // t = UInt(Rt); n = UInt(Rn); imm32 = ZeroExtend(imm5:’00’, 32); |
| t = Bits32 (opcode, 2, 0); |
| n = Bits32 (opcode, 5, 3); |
| imm32 = Bits32 (opcode, 10, 6) << 2; |
| |
| // index = TRUE; add = TRUE; wback = FALSE; |
| index = true; |
| add = false; |
| wback = false; |
| break; |
| |
| case eEncodingT2: |
| // t = UInt(Rt); n = 13; imm32 = ZeroExtend(imm8:’00’, 32); |
| t = Bits32 (opcode, 10, 8); |
| n = 13; |
| imm32 = Bits32 (opcode, 7, 0) << 2; |
| |
| // index = TRUE; add = TRUE; wback = FALSE; |
| index = true; |
| add = true; |
| wback = false; |
| break; |
| |
| case eEncodingT3: |
| // if Rn == ’1111’ then UNDEFINED; |
| if (Bits32 (opcode, 19, 16) == 15) |
| return false; |
| |
| // t = UInt(Rt); n = UInt(Rn); imm32 = ZeroExtend(imm12, 32); |
| t = Bits32 (opcode, 15, 12); |
| n = Bits32 (opcode, 19, 16); |
| imm32 = Bits32 (opcode, 11, 0); |
| |
| // index = TRUE; add = TRUE; wback = FALSE; |
| index = true; |
| add = true; |
| wback = false; |
| |
| // if t == 15 then UNPREDICTABLE; |
| if (t == 15) |
| return false; |
| break; |
| |
| case eEncodingT4: |
| // if P == ’1’ && U == ’1’ && W == ’0’ then SEE STRT; |
| // if Rn == ’1101’ && P == ’1’ && U == ’0’ && W == ’1’ && imm8 == ’00000100’ then SEE PUSH; |
| // if Rn == ’1111’ || (P == ’0’ && W == ’0’) then UNDEFINED; |
| if ((Bits32 (opcode, 19, 16) == 15) |
| || (BitIsClear (opcode, 10) && BitIsClear (opcode, 8))) |
| return false; |
| |
| // t = UInt(Rt); n = UInt(Rn); imm32 = ZeroExtend(imm8, 32); |
| t = Bits32 (opcode, 15, 12); |
| n = Bits32 (opcode, 19, 16); |
| imm32 = Bits32 (opcode, 7, 0); |
| |
| // index = (P == ’1’); add = (U == ’1’); wback = (W == ’1’); |
| index = BitIsSet (opcode, 10); |
| add = BitIsSet (opcode, 9); |
| wback = BitIsSet (opcode, 8); |
| |
| // if t == 15 || (wback && n == t) then UNPREDICTABLE; |
| if ((t == 15) || (wback && (n == t))) |
| return false; |
| break; |
| |
| default: |
| return false; |
| } |
| |
| addr_t offset_addr; |
| addr_t address; |
| |
| // offset_addr = if add then (R[n] + imm32) else (R[n] - imm32); |
| uint32_t base_address = ReadRegisterUnsigned (eRegisterKindDWARF, dwarf_r0 + n, 0, &success); |
| if (!success) |
| return false; |
| |
| if (add) |
| offset_addr = base_address + imm32; |
| else |
| offset_addr = base_address - imm32; |
| |
| // address = if index then offset_addr else R[n]; |
| if (index) |
| address = offset_addr; |
| else |
| address = base_address; |
| |
| EmulateInstruction::Context context; |
| context.type = eContextRegisterStore; |
| Register base_reg; |
| base_reg.SetRegister (eRegisterKindDWARF, dwarf_r0 + n); |
| |
| // if UnalignedSupport() || address<1:0> == ’00’ then |
| if (UnalignedSupport () || (BitIsClear (address, 1) && BitIsClear (address, 0))) |
| { |
| // MemU[address,4] = R[t]; |
| uint32_t data = ReadRegisterUnsigned (eRegisterKindDWARF, dwarf_r0 + t, 0, &success); |
| if (!success) |
| return false; |
| |
| Register data_reg; |
| data_reg.SetRegister (eRegisterKindDWARF, dwarf_r0 + t); |
| int32_t offset = address - base_address; |
| context.SetRegisterToRegisterPlusOffset (data_reg, base_reg, offset); |
| if (!MemUWrite (context, address, data, addr_byte_size)) |
| return false; |
| } |
| else |
| { |
| // MemU[address,4] = bits(32) UNKNOWN; |
| WriteBits32UnknownToMemory (address); |
| } |
| |
| // if wback then R[n] = offset_addr; |
| if (wback) |
| { |
| context.type = eContextRegisterLoad; |
| context.SetAddress (offset_addr); |
| if (!WriteRegisterUnsigned (context, eRegisterKindDWARF, dwarf_r0 + n, offset_addr)) |
| return false; |
| } |
| } |
| return true; |
| } |
| |
| // STR (Store Register) calculates an address from a base register value and an offset register value, stores a |
| // word from a register to memory. The offset register value can optionally be shifted. |
| bool |
| EmulateInstructionARM::EmulateSTRRegister (ARMEncoding encoding) |
| { |
| #if 0 |
| if ConditionPassed() then |
| EncodingSpecificOperations(); NullCheckIfThumbEE(n); |
| offset = Shift(R[m], shift_t, shift_n, APSR.C); |
| offset_addr = if add then (R[n] + offset) else (R[n] - offset); |
| address = if index then offset_addr else R[n]; |
| if t == 15 then // Only possible for encoding A1 |
| data = PCStoreValue(); |
| else |
| data = R[t]; |
| if UnalignedSupport() || address<1:0> == ’00’ || CurrentInstrSet() == InstrSet_ARM then |
| MemU[address,4] = data; |
| else // Can only occur before ARMv7 |
| MemU[address,4] = bits(32) UNKNOWN; |
| if wback then R[n] = offset_addr; |
| #endif |
| |
| bool success = false; |
| const uint32_t opcode = OpcodeAsUnsigned (&success); |
| if (!success) |
| return false; |
| |
| if (ConditionPassed()) |
| { |
| const uint32_t addr_byte_size = GetAddressByteSize(); |
| |
| uint32_t t; |
| uint32_t n; |
| uint32_t m; |
| ARM_ShifterType shift_t; |
| uint32_t shift_n; |
| bool index; |
| bool add; |
| bool wback; |
| |
| // EncodingSpecificOperations (); NullCheckIfThumbEE(n); |
| switch (encoding) |
| { |
| case eEncodingT1: |
| // if CurrentInstrSet() == InstrSet_ThumbEE then SEE "Modified operation in ThumbEE"; |
| // t = UInt(Rt); n = UInt(Rn); m = UInt(Rm); |
| t = Bits32 (opcode, 2, 0); |
| n = Bits32 (opcode, 5, 3); |
| m = Bits32 (opcode, 8, 6); |
| |
| // index = TRUE; add = TRUE; wback = FALSE; |
| index = true; |
| add = true; |
| wback = false; |
| |
| // (shift_t, shift_n) = (SRType_LSL, 0); |
| shift_t = SRType_LSL; |
| shift_n = 0; |
| break; |
| |
| case eEncodingT2: |
| // if Rn == ’1111’ then UNDEFINED; |
| if (Bits32 (opcode, 19, 16) == 15) |
| return false; |
| |
| // t = UInt(Rt); n = UInt(Rn); m = UInt(Rm); |
| t = Bits32 (opcode, 15, 12); |
| n = Bits32 (opcode, 19, 16); |
| m = Bits32 (opcode, 3, 0); |
| |
| // index = TRUE; add = TRUE; wback = FALSE; |
| index = true; |
| add = true; |
| wback = false; |
| |
| // (shift_t, shift_n) = (SRType_LSL, UInt(imm2)); |
| shift_t = SRType_LSL; |
| shift_n = Bits32 (opcode, 5, 4); |
| |
| // if t == 15 || BadReg(m) then UNPREDICTABLE; |
| if ((t == 15) || (BadReg (m))) |
| return false; |
| break; |
| |
| case eEncodingA1: |
| { |
| // if P == ’0’ && W == ’1’ then SEE STRT; |
| // t = UInt(Rt); n = UInt(Rn); m = UInt(Rm); |
| t = Bits32 (opcode, 15, 12); |
| n = Bits32 (opcode, 19, 16); |
| m = Bits32 (opcode, 3, 0); |
| |
| // index = (P == ’1’); add = (U == ’1’); wback = (P == ’0’) || (W == ’1’); |
| index = BitIsSet (opcode, 24); |
| add = BitIsSet (opcode, 23); |
| wback = (BitIsClear (opcode, 24) || BitIsSet (opcode, 21)); |
| |
| // (shift_t, shift_n) = DecodeImmShift(type, imm5); |
| uint32_t typ = Bits32 (opcode, 6, 5); |
| uint32_t imm5 = Bits32 (opcode, 11, 7); |
| shift_n = DecodeImmShift(typ, imm5, shift_t); |
| |
| // if m == 15 then UNPREDICTABLE; |
| if (m == 15) |
| return false; |
| |
| // if wback && (n == 15 || n == t) then UNPREDICTABLE; |
| if (wback && ((n == 15) || (n == t))) |
| return false; |
| |
| break; |
| } |
| default: |
| return false; |
| } |
| |
| addr_t offset_addr; |
| addr_t address; |
| int32_t offset = 0; |
| |
| addr_t base_address = ReadRegisterUnsigned (eRegisterKindDWARF, dwarf_r0 + n, 0, &success); |
| if (!success) |
| return false; |
| |
| uint32_t Rm_data = ReadRegisterUnsigned (eRegisterKindDWARF, dwarf_r0 + m, 0, &success); |
| if (!success) |
| return false; |
| |
| // offset = Shift(R[m], shift_t, shift_n, APSR.C); |
| offset = Shift (Rm_data, shift_t, shift_n, APSR_C); |
| |
| // offset_addr = if add then (R[n] + offset) else (R[n] - offset); |
| if (add) |
| offset_addr = base_address + offset; |
| else |
| offset_addr = base_address - offset; |
| |
| // address = if index then offset_addr else R[n]; |
| if (index) |
| address = offset_addr; |
| else |
| address = base_address; |
| |
| uint32_t data; |
| // if t == 15 then // Only possible for encoding A1 |
| if (t == 15) |
| // data = PCStoreValue(); |
| data = ReadRegisterUnsigned(eRegisterKindGeneric, LLDB_REGNUM_GENERIC_PC, 0, &success); |
| else |
| // data = R[t]; |
| data = ReadRegisterUnsigned (eRegisterKindDWARF, dwarf_r0 + t, 0, &success); |
| |
| if (!success) |
| return false; |
| |
| EmulateInstruction::Context context; |
| context.type = eContextRegisterStore; |
| |
| // if UnalignedSupport() || address<1:0> == ’00’ || CurrentInstrSet() == InstrSet_ARM then |
| if (UnalignedSupport () |
| || (BitIsClear (address, 1) && BitIsClear (address, 0)) |
| || CurrentInstrSet() == eModeARM) |
| { |
| // MemU[address,4] = data; |
| |
| Register base_reg; |
| base_reg.SetRegister (eRegisterKindDWARF, dwarf_r0 + n); |
| |
| Register data_reg; |
| data_reg.SetRegister (eRegisterKindDWARF, dwarf_r0 + t); |
| |
| context.SetRegisterToRegisterPlusOffset (data_reg, base_reg, address - base_address); |
| if (!MemUWrite (context, address, data, addr_byte_size)) |
| return false; |
| |
| } |
| else |
| // MemU[address,4] = bits(32) UNKNOWN; |
| WriteBits32UnknownToMemory (address); |
| |
| // if wback then R[n] = offset_addr; |
| if (wback) |
| { |
| context.type = eContextRegisterLoad; |
| context.SetAddress (offset_addr); |
| if (!WriteRegisterUnsigned (context, eRegisterKindDWARF, dwarf_r0 + n, offset_addr)) |
| return false; |
| } |
| |
| } |
| return true; |
| } |
| |
| bool |
| EmulateInstructionARM::EmulateSTRBThumb (ARMEncoding encoding) |
| { |
| #if 0 |
| if ConditionPassed() then |
| EncodingSpecificOperations(); NullCheckIfThumbEE(n); |
| offset_addr = if add then (R[n] + imm32) else (R[n] - imm32); |
| address = if index then offset_addr else R[n]; |
| MemU[address,1] = R[t]<7:0>; |
| if wback then R[n] = offset_addr; |
| #endif |
| |
| |
| bool success = false; |
| const uint32_t opcode = OpcodeAsUnsigned (&success); |
| if (!success) |
| return false; |
| |
| if (ConditionPassed ()) |
| { |
| uint32_t t; |
| uint32_t n; |
| uint32_t imm32; |
| bool index; |
| bool add; |
| bool wback; |
| // EncodingSpecificOperations(); NullCheckIfThumbEE(n); |
| switch (encoding) |
| { |
| case eEncodingT1: |
| // t = UInt(Rt); n = UInt(Rn); imm32 = ZeroExtend(imm5, 32); |
| t = Bits32 (opcode, 2, 0); |
| n = Bits32 (opcode, 5, 3); |
| imm32 = Bits32 (opcode, 10, 6); |
| |
| // index = TRUE; add = TRUE; wback = FALSE; |
| index = true; |
| add = true; |
| wback = false; |
| break; |
| |
| case eEncodingT2: |
| // if Rn == ’1111’ then UNDEFINED; |
| if (Bits32 (opcode, 19, 16) == 15) |
| return false; |
| |
| // t = UInt(Rt); n = UInt(Rn); imm32 = ZeroExtend(imm12, 32); |
| t = Bits32 (opcode, 15, 12); |
| n = Bits32 (opcode, 19, 16); |
| imm32 = Bits32 (opcode, 11, 0); |
| |
| // index = TRUE; add = TRUE; wback = FALSE; |
| index = true; |
| add = true; |
| wback = false; |
| |
| // if BadReg(t) then UNPREDICTABLE; |
| if (BadReg (t)) |
| return false; |
| break; |
| |
| case eEncodingT3: |
| // if P == ’1’ && U == ’1’ && W == ’0’ then SEE STRBT; |
| // if Rn == ’1111’ || (P == ’0’ && W == ’0’) then UNDEFINED; |
| if (Bits32 (opcode, 19, 16) == 15) |
| return false; |
| |
| // t = UInt(Rt); n = UInt(Rn); imm32 = ZeroExtend(imm8, 32); |
| t = Bits32 (opcode, 15, 12); |
| n = Bits32 (opcode, 19, 16); |
| imm32 = Bits32 (opcode, 7, 0); |
| |
| // index = (P == ’1’); add = (U == ’1’); wback = (W == ’1’); |
| index = BitIsSet (opcode, 10); |
| add = BitIsSet (opcode, 9); |
| wback = BitIsSet (opcode, 8); |
| |
| // if BadReg(t) || (wback && n == t) then UNPREDICTABLE |
| if ((BadReg (t)) || (wback && (n == t))) |
| return false; |
| break; |
| |
| default: |
| return false; |
| } |
| |
| addr_t offset_addr; |
| addr_t address; |
| addr_t base_address = ReadRegisterUnsigned (eRegisterKindDWARF, dwarf_r0 + n, 0, &success); |
| if (!success) |
| return false; |
| |
| // offset_addr = if add then (R[n] + imm32) else (R[n] - imm32); |
| if (add) |
| offset_addr = base_address + imm32; |
| else |
| offset_addr = base_address - imm32; |
| |
| // address = if index then offset_addr else R[n]; |
| if (index) |
| address = offset_addr; |
| else |
| address = base_address; |
| |
| // MemU[address,1] = R[t]<7:0> |
| Register base_reg; |
| base_reg.SetRegister (eRegisterKindDWARF, dwarf_r0 + n); |
| |
| Register data_reg; |
| data_reg.SetRegister (eRegisterKindDWARF, dwarf_r0 + t); |
| |
| EmulateInstruction::Context context; |
| context.type = eContextRegisterStore; |
| context.SetRegisterToRegisterPlusOffset (data_reg, base_reg, address - base_address); |
| |
| uint32_t data = ReadRegisterUnsigned (eRegisterKindDWARF, dwarf_r0 + t, 0, &success); |
| if (!success) |
| return false; |
| |
| data = Bits32 (data, 7, 0); |
| |
| if (!MemUWrite (context, address, data, 1)) |
| return false; |
| |
| // if wback then R[n] = offset_addr; |
| if (wback) |
| { |
| context.type = eContextRegisterLoad; |
| context.SetAddress (offset_addr); |
| if (!WriteRegisterUnsigned (context, eRegisterKindDWARF, dwarf_r0 + n, offset_addr)) |
| return false; |
| } |
| |
| } |
| |
| return true; |
| } |
| |
| // Add with Carry (immediate) adds an immediate value and the carry flag value to a register value, |
| // and writes the result to the destination register. It can optionally update the condition flags |
| // based on the result. |
| bool |
| EmulateInstructionARM::EmulateADCImm (ARMEncoding encoding) |
| { |
| #if 0 |
| // ARM pseudo code... |
| if ConditionPassed() then |
| EncodingSpecificOperations(); |
| (result, carry, overflow) = AddWithCarry(R[n], imm32, APSR.C); |
| if d == 15 then // Can only occur for ARM encoding |
| ALUWritePC(result); // setflags is always FALSE here |
| else |
| R[d] = result; |
| if setflags then |
| APSR.N = result<31>; |
| APSR.Z = IsZeroBit(result); |
| APSR.C = carry; |
| APSR.V = overflow; |
| #endif |
| |
| bool success = false; |
| const uint32_t opcode = OpcodeAsUnsigned (&success); |
| if (!success) |
| return false; |
| |
| if (ConditionPassed()) |
| { |
| uint32_t Rd, Rn; |
| uint32_t imm32; // the immediate value to be added to the value obtained from Rn |
| bool setflags; |
| switch (encoding) |
| { |
| case eEncodingT1: |
| Rd = Bits32(opcode, 11, 8); |
| Rn = Bits32(opcode, 19, 16); |
| setflags = BitIsSet(opcode, 20); |
| imm32 = ThumbExpandImm(opcode); // imm32 = ThumbExpandImm(i:imm3:imm8) |
| if (BadReg(Rd) || BadReg(Rn)) |
| return false; |
| break; |
| case eEncodingA1: |
| Rd = Bits32(opcode, 15, 12); |
| Rn = Bits32(opcode, 19, 16); |
| setflags = BitIsSet(opcode, 20); |
| imm32 = ARMExpandImm(opcode); // imm32 = ARMExpandImm(imm12) |
| // TODO: Emulate SUBS PC, LR and related instructions. |
| if (Rd == 15 && setflags) |
| return false; |
| break; |
| default: |
| return false; |
| } |
| |
| // Read the first operand. |
| int32_t val1 = ReadCoreReg(Rn, &success); |
| if (!success) |
| return false; |
| |
| AddWithCarryResult res = AddWithCarry(val1, imm32, APSR_C); |
| |
| EmulateInstruction::Context context; |
| context.type = EmulateInstruction::eContextImmediate; |
| context.SetNoArgs (); |
| |
| if (!WriteCoreRegOptionalFlags(context, res.result, Rd, setflags, res.carry_out, res.overflow)) |
| return false; |
| } |
| return true; |
| } |
| |
| // Add with Carry (register) adds a register value, the carry flag value, and an optionally-shifted |
| // register value, and writes the result to the destination register. It can optionally update the |
| // condition flags based on the result. |
| bool |
| EmulateInstructionARM::EmulateADCReg (ARMEncoding encoding) |
| { |
| #if 0 |
| // ARM pseudo code... |
| if ConditionPassed() then |
| EncodingSpecificOperations(); |
| shifted = Shift(R[m], shift_t, shift_n, APSR.C); |
| (result, carry, overflow) = AddWithCarry(R[n], shifted, APSR.C); |
| if d == 15 then // Can only occur for ARM encoding |
| ALUWritePC(result); // setflags is always FALSE here |
| else |
| R[d] = result; |
| if setflags then |
| APSR.N = result<31>; |
| APSR.Z = IsZeroBit(result); |
| APSR.C = carry; |
| APSR.V = overflow; |
| #endif |
| |
| bool success = false; |
| const uint32_t opcode = OpcodeAsUnsigned (&success); |
| if (!success) |
| return false; |
| |
| if (ConditionPassed()) |
| { |
| uint32_t Rd, Rn, Rm; |
| ARM_ShifterType shift_t; |
| uint32_t shift_n; // the shift applied to the value read from Rm |
| bool setflags; |
| switch (encoding) |
| { |
| case eEncodingT1: |
| Rd = Rn = Bits32(opcode, 2, 0); |
| Rm = Bits32(opcode, 5, 3); |
| setflags = !InITBlock(); |
| shift_t = SRType_LSL; |
| shift_n = 0; |
| break; |
| case eEncodingT2: |
| Rd = Bits32(opcode, 11, 8); |
| Rn = Bits32(opcode, 19, 16); |
| Rm = Bits32(opcode, 3, 0); |
| setflags = BitIsSet(opcode, 20); |
| shift_n = DecodeImmShiftThumb(opcode, shift_t); |
| if (BadReg(Rd) || BadReg(Rn) || BadReg(Rm)) |
| return false; |
| break; |
| case eEncodingA1: |
| Rd = Bits32(opcode, 15, 12); |
| Rn = Bits32(opcode, 19, 16); |
| Rm = Bits32(opcode, 3, 0); |
| setflags = BitIsSet(opcode, 20); |
| shift_n = DecodeImmShiftARM(opcode, shift_t); |
| // TODO: Emulate SUBS PC, LR and related instructions. |
| if (Rd == 15 && setflags) |
| return false; |
| break; |
| default: |
| return false; |
| } |
| |
| // Read the first operand. |
| int32_t val1 = ReadCoreReg(Rn, &success); |
| if (!success) |
| return false; |
| |
| // Read the second operand. |
| int32_t val2 = ReadCoreReg(Rm, &success); |
| if (!success) |
| return false; |
| |
| uint32_t shifted = Shift(val2, shift_t, shift_n, APSR_C); |
| AddWithCarryResult res = AddWithCarry(val1, shifted, APSR_C); |
| |
| EmulateInstruction::Context context; |
| context.type = EmulateInstruction::eContextImmediate; |
| context.SetNoArgs (); |
| |
| if (!WriteCoreRegOptionalFlags(context, res.result, Rd, setflags, res.carry_out, res.overflow)) |
| return false; |
| } |
| return true; |
| } |
| |
| // This instruction performs a bitwise AND of a register value and an immediate value, and writes the result |
| // to the destination register. It can optionally update the condition flags based on the result. |
| bool |
| EmulateInstructionARM::EmulateANDImm (ARMEncoding encoding) |
| { |
| #if 0 |
| // ARM pseudo code... |
| if ConditionPassed() then |
| EncodingSpecificOperations(); |
| result = R[n] AND imm32; |
| if d == 15 then // Can only occur for ARM encoding |
| ALUWritePC(result); // setflags is always FALSE here |
| else |
| R[d] = result; |
| if setflags then |
| APSR.N = result<31>; |
| APSR.Z = IsZeroBit(result); |
| APSR.C = carry; |
| // APSR.V unchanged |
| #endif |
| |
| bool success = false; |
| const uint32_t opcode = OpcodeAsUnsigned (&success); |
| if (!success) |
| return false; |
| |
| if (ConditionPassed()) |
| { |
| uint32_t Rd, Rn; |
| uint32_t imm32; // the immediate value to be ANDed to the value obtained from Rn |
| bool setflags; |
| uint32_t carry; // the carry bit after ARM/Thumb Expand operation |
| switch (encoding) |
| { |
| case eEncodingT1: |
| Rd = Bits32(opcode, 11, 8); |
| Rn = Bits32(opcode, 19, 16); |
| setflags = BitIsSet(opcode, 20); |
| imm32 = ThumbExpandImm_C(opcode, APSR_C, carry); // (imm32, carry) = ThumbExpandImm(i:imm3:imm8, APSR.C) |
| // if Rd == '1111' && S == '1' then SEE TST (immediate); |
| if (Rd == 15 && setflags) |
| return EmulateTSTImm(eEncodingT1); |
| if (Rd == 13 || (Rd == 15 && !setflags) || BadReg(Rn)) |
| return false; |
| break; |
| case eEncodingA1: |
| Rd = Bits32(opcode, 15, 12); |
| Rn = Bits32(opcode, 19, 16); |
| setflags = BitIsSet(opcode, 20); |
| imm32 = ARMExpandImm_C(opcode, APSR_C, carry); // (imm32, carry) = ARMExpandImm(imm12, APSR.C) |
| // TODO: Emulate SUBS PC, LR and related instructions. |
| if (Rd == 15 && setflags) |
| return false; |
| break; |
| default: |
| return false; |
| } |
| |
| // Read the first operand. |
| uint32_t val1 = ReadCoreReg(Rn, &success); |
| if (!success) |
| return false; |
| |
| uint32_t result = val1 & imm32; |
| |
| EmulateInstruction::Context context; |
| context.type = EmulateInstruction::eContextImmediate; |
| context.SetNoArgs (); |
| |
| if (!WriteCoreRegOptionalFlags(context, result, Rd, setflags, carry)) |
| return false; |
| } |
| return true; |
| } |
| |
| // This instruction performs a bitwise AND of a register value and an optionally-shifted register value, |
| // and writes the result to the destination register. It can optionally update the condition flags |
| // based on the result. |
| bool |
| EmulateInstructionARM::EmulateANDReg (ARMEncoding encoding) |
| { |
| #if 0 |
| // ARM pseudo code... |
| if ConditionPassed() then |
| EncodingSpecificOperations(); |
| (shifted, carry) = Shift_C(R[m], shift_t, shift_n, APSR.C); |
| result = R[n] AND shifted; |
| if d == 15 then // Can only occur for ARM encoding |
| ALUWritePC(result); // setflags is always FALSE here |
| else |
| R[d] = result; |
| if setflags then |
| APSR.N = result<31>; |
| APSR.Z = IsZeroBit(result); |
| APSR.C = carry; |
| // APSR.V unchanged |
| #endif |
| |
| bool success = false; |
| const uint32_t opcode = OpcodeAsUnsigned (&success); |
| if (!success) |
| return false; |
| |
| if (ConditionPassed()) |
| { |
| uint32_t Rd, Rn, Rm; |
| ARM_ShifterType shift_t; |
| uint32_t shift_n; // the shift applied to the value read from Rm |
| bool setflags; |
| uint32_t carry; |
| switch (encoding) |
| { |
| case eEncodingT1: |
| Rd = Rn = Bits32(opcode, 2, 0); |
| Rm = Bits32(opcode, 5, 3); |
| setflags = !InITBlock(); |
| shift_t = SRType_LSL; |
| shift_n = 0; |
| break; |
| case eEncodingT2: |
| Rd = Bits32(opcode, 11, 8); |
| Rn = Bits32(opcode, 19, 16); |
| Rm = Bits32(opcode, 3, 0); |
| setflags = BitIsSet(opcode, 20); |
| shift_n = DecodeImmShiftThumb(opcode, shift_t); |
| // if Rd == '1111' && S == '1' then SEE TST (register); |
| if (Rd == 15 && setflags) |
| return EmulateTSTReg(eEncodingT2); |
| if (Rd == 13 || (Rd == 15 && !setflags) || BadReg(Rn) || BadReg(Rm)) |
| return false; |
| break; |
| case eEncodingA1: |
| Rd = Bits32(opcode, 15, 12); |
| Rn = Bits32(opcode, 19, 16); |
| Rm = Bits32(opcode, 3, 0); |
| setflags = BitIsSet(opcode, 20); |
| shift_n = DecodeImmShiftARM(opcode, shift_t); |
| // TODO: Emulate SUBS PC, LR and related instructions. |
| if (Rd == 15 && setflags) |
| return false; |
| break; |
| default: |
| return false; |
| } |
| |
| // Read the first operand. |
| uint32_t val1 = ReadCoreReg(Rn, &success); |
| if (!success) |
| return false; |
| |
| // Read the second operand. |
| uint32_t val2 = ReadCoreReg(Rm, &success); |
| if (!success) |
| return false; |
| |
| uint32_t shifted = Shift_C(val2, shift_t, shift_n, APSR_C, carry); |
| uint32_t result = val1 & shifted; |
| |
| EmulateInstruction::Context context; |
| context.type = EmulateInstruction::eContextImmediate; |
| context.SetNoArgs (); |
| |
| if (!WriteCoreRegOptionalFlags(context, result, Rd, setflags, carry)) |
| return false; |
| } |
| return true; |
| } |
| |
| // LDR (immediate, ARM) calculates an address from a base register value and an immediate offset, loads a word |
| // from memory, and writes it to a register. It can use offset, post-indexed, or pre-indexed addressing. |
| bool |
| EmulateInstructionARM::EmulateLDRImmediateARM (ARMEncoding encoding) |
| { |
| #if 0 |
| if ConditionPassed() then |
| EncodingSpecificOperations(); |
| offset_addr = if add then (R[n] + imm32) else (R[n] - imm32); |
| address = if index then offset_addr else R[n]; |
| data = MemU[address,4]; |
| if wback then R[n] = offset_addr; |
| if t == 15 then |
| if address<1:0> == ’00’ then LoadWritePC(data); else UNPREDICTABLE; |
| elsif UnalignedSupport() || address<1:0> = ’00’ then |
| R[t] = data; |
| else // Can only apply before ARMv7 |
| R[t] = ROR(data, 8*UInt(address<1:0>)); |
| #endif |
| |
| bool success = false; |
| const uint32_t opcode = OpcodeAsUnsigned (&success); |
| if (!success) |
| return false; |
| |
| if (ConditionPassed ()) |
| { |
| const uint32_t addr_byte_size = GetAddressByteSize(); |
| |
| uint32_t t; |
| uint32_t n; |
| uint32_t imm32; |
| bool index; |
| bool add; |
| bool wback; |
| |
| switch (encoding) |
| { |
| case eEncodingA1: |
| // if Rn == ’1111’ then SEE LDR (literal); |
| // if P == ’0’ && W == ’1’ then SEE LDRT; |
| // if Rn == ’1101’ && P == ’0’ && U == ’1’ && W == ’0’ && imm12 == ’000000000100’ then SEE POP; |
| // t == UInt(Rt); n = UInt(Rn); imm32 = ZeroExtend(imm12, 32); |
| t = Bits32 (opcode, 15, 12); |
| n = Bits32 (opcode, 19, 16); |
| imm32 = Bits32 (opcode, 11, 0); |
| |
| // index = (P == ’1’); add = (U == ’1’); wback = (P == ’0’) || (W == ’1’); |
| index = BitIsSet (opcode, 24); |
| add = BitIsSet (opcode, 23); |
| wback = (BitIsClear (opcode, 24) || BitIsSet (opcode, 21)); |
| |
| // if wback && n == t then UNPREDICTABLE; |
| if (wback && (n == t)) |
| return false; |
| |
| break; |
| |
| default: |
| return false; |
| } |
| |
| addr_t address; |
| addr_t offset_addr; |
| addr_t base_address = ReadRegisterUnsigned (eRegisterKindDWARF, dwarf_r0 + n, 0, &success); |
| if (!success) |
| return false; |
| |
| // offset_addr = if add then (R[n] + imm32) else (R[n] - imm32); |
| if (add) |
| offset_addr = base_address + imm32; |
| else |
| offset_addr = base_address - imm32; |
| |
| // address = if index then offset_addr else R[n]; |
| if (index) |
| address = offset_addr; |
| else |
| address = base_address; |
| |
| // data = MemU[address,4]; |
| |
| Register base_reg; |
| base_reg.SetRegister (eRegisterKindDWARF, dwarf_r0 + n); |
| |
| EmulateInstruction::Context context; |
| context.type = eContextRegisterLoad; |
| context.SetRegisterPlusOffset (base_reg, address - base_address); |
| |
| uint64_t data = MemURead (context, address, addr_byte_size, 0, &success); |
| if (!success) |
| return false; |
| |
| // if wback then R[n] = offset_addr; |
| if (wback) |
| { |
| context.type = eContextAdjustBaseRegister; |
| context.SetAddress (offset_addr); |
| if (!WriteRegisterUnsigned (context, eRegisterKindDWARF, dwarf_r0 + n, offset_addr)) |
| return false; |
| } |
| |
| // if t == 15 then |
| if (t == 15) |
| { |
| // if address<1:0> == ’00’ then LoadWritePC(data); else UNPREDICTABLE; |
| if (BitIsClear (address, 1) && BitIsClear (address, 0)) |
| { |
| // LoadWritePC (data); |
| context.type = eContextRegisterLoad; |
| context.SetRegisterPlusOffset (base_reg, address - base_address); |
| LoadWritePC (context, data); |
| } |
| else |
| return false; |
| } |
| // elsif UnalignedSupport() || address<1:0> = ’00’ then |
| else if (UnalignedSupport() || (BitIsClear (address, 1) && BitIsClear (address, 0))) |
| { |
| // R[t] = data; |
| context.type = eContextRegisterLoad; |
| context.SetRegisterPlusOffset (base_reg, address - base_address); |
| if (!WriteRegisterUnsigned (context, eRegisterKindDWARF, dwarf_r0 + t, data)) |
| return false; |
| } |
| // else // Can only apply before ARMv7 |
| else |
| { |
| // R[t] = ROR(data, 8*UInt(address<1:0>)); |
| data = ROR (data, Bits32 (address, 1, 0)); |
| context.type = eContextRegisterLoad; |
| context.SetImmediate (data); |
| if (!WriteRegisterUnsigned (context, eRegisterKindDWARF, dwarf_r0 + t, data)) |
| return false; |
| } |
| |
| } |
| return true; |
| } |
| |
| // LDR (register) calculates an address from a base register value and an offset register value, loads a word |
| // from memory, and writes it to a resgister. The offset register value can optionally be shifted. |
| bool |
| EmulateInstructionARM::EmulateLDRRegister (ARMEncoding encoding) |
| { |
| #if 0 |
| if ConditionPassed() then |
| EncodingSpecificOperations(); NullCheckIfThumbEE(n); |
| offset = Shift(R[m], shift_t, shift_n, APSR.C); |
| offset_addr = if add then (R[n] + offset) else (R[n] - offset); |
| address = if index then offset_addr else R[n]; |
| data = MemU[address,4]; |
| if wback then R[n] = offset_addr; |
| if t == 15 then |
| if address<1:0> == ’00’ then LoadWritePC(data); else UNPREDICTABLE; |
| elsif UnalignedSupport() || address<1:0> = ’00’ then |
| R[t] = data; |
| else // Can only apply before ARMv7 |
| if CurrentInstrSet() == InstrSet_ARM then |
| R[t] = ROR(data, 8*UInt(address<1:0>)); |
| else |
| R[t] = bits(32) UNKNOWN; |
| #endif |
| |
| bool success = false; |
| const uint32_t opcode = OpcodeAsUnsigned (&success); |
| if (!success) |
| return false; |
| |
| if (ConditionPassed ()) |
| { |
| const uint32_t addr_byte_size = GetAddressByteSize(); |
| |
| uint32_t t; |
| uint32_t n; |
| uint32_t m; |
| bool index; |
| bool add; |
| bool wback; |
| ARM_ShifterType shift_t; |
| uint32_t shift_n; |
| |
| switch (encoding) |
| { |
| case eEncodingT1: |
| // if CurrentInstrSet() == InstrSet_ThumbEE then SEE "Modified operation in ThumbEE"; |
| // t = UInt(Rt); n = UInt(Rn); m = UInt(Rm); |
| t = Bits32 (opcode, 2, 0); |
| n = Bits32 (opcode, 5, 3); |
| m = Bits32 (opcode, 8, 6); |
| |
| // index = TRUE; add = TRUE; wback = FALSE; |
| index = true; |
| add = true; |
| wback = false; |
| |
| // (shift_t, shift_n) = (SRType_LSL, 0); |
| shift_t = SRType_LSL; |
| shift_n = 0; |
| |
| break; |
| |
| case eEncodingT2: |
| // if Rn == ’1111’ then SEE LDR (literal); |
| // t = UInt(Rt); n = UInt(Rn); m = UInt(Rm); |
| t = Bits32 (opcode, 15, 12); |
| n = Bits32 (opcode, 19, 16); |
| m = Bits32 (opcode, 3, 0); |
| |
| // index = TRUE; add = TRUE; wback = FALSE; |
| index = true; |
| add = true; |
| wback = false; |
| |
| // (shift_t, shift_n) = (SRType_LSL, UInt(imm2)); |
| shift_t = SRType_LSL; |
| shift_n = Bits32 (opcode, 5, 4); |
| |
| // if BadReg(m) then UNPREDICTABLE; |
| if (BadReg (m)) |
| return false; |
| |
| // if t == 15 && InITBlock() && !LastInITBlock() then UNPREDICTABLE; |
| if ((t == 15) && InITBlock() && !LastInITBlock()) |
| return false; |
| |
| break; |
| |
| case eEncodingA1: |
| { |
| // if P == ’0’ && W == ’1’ then SEE LDRT; |
| // t = UInt(Rt); n = UInt(Rn); m = UInt(Rm); |
| t = Bits32 (opcode, 15, 12); |
| n = Bits32 (opcode, 19, 16); |
| m = Bits32 (opcode, 3, 0); |
| |
| // index = (P == ’1’); add = (U == ’1’); wback = (P == ’0’) || (W == ’1’); |
| index = BitIsSet (opcode, 24); |
| add = BitIsSet (opcode, 23); |
| wback = (BitIsClear (opcode, 24) || BitIsSet (opcode, 21)); |
| |
| // (shift_t, shift_n) = DecodeImmShift(type, imm5); |
| uint32_t type = Bits32 (opcode, 6, 5); |
| uint32_t imm5 = Bits32 (opcode, 11, 7); |
| shift_n = DecodeImmShift (type, imm5, shift_t); |
| |
| // if m == 15 then UNPREDICTABLE; |
| if (m == 15) |
| return false; |
| |
| // if wback && (n == 15 || n == t) then UNPREDICTABLE; |
| if (wback && ((n == 15) || (n == t))) |
| return false; |
| } |
| break; |
| |
| |
| default: |
| return false; |
| } |
| |
| uint32_t Rm = ReadRegisterUnsigned (eRegisterKindDWARF, dwarf_r0 + m, 0, &success); |
| if (!success) |
| return false; |
| |
| uint32_t Rn = ReadRegisterUnsigned (eRegisterKindDWARF, dwarf_r0 + n, 0, &success); |
| if (!success) |
| return false; |
| |
| addr_t offset_addr; |
| addr_t address; |
| |
| // offset = Shift(R[m], shift_t, shift_n, APSR.C); -- Note "The APSR is an application level alias for the CPSR". |
| addr_t offset = Shift (Rm, shift_t, shift_n, Bit32 (m_inst_cpsr, CPSR_C)); |
| |
| // offset_addr = if add then (R[n] + offset) else (R[n] - offset); |
| if (add) |
| offset_addr = Rn + offset; |
| else |
| offset_addr = Rn - offset; |
| |
| // address = if index then offset_addr else R[n]; |
| if (index) |
| address = offset_addr; |
| else |
| address = Rn; |
| |
| // data = MemU[address,4]; |
| Register base_reg; |
| base_reg.SetRegister (eRegisterKindDWARF, dwarf_r0 + n); |
| |
| EmulateInstruction::Context context; |
| context.type = eContextRegisterLoad; |
| context.SetRegisterPlusOffset (base_reg, address - Rn); |
| |
| uint64_t data = MemURead (context, address, addr_byte_size, 0, &success); |
| if (!success) |
| return false; |
| |
| // if wback then R[n] = offset_addr; |
| if (wback) |
| { |
| context.type = eContextAdjustBaseRegister; |
| context.SetAddress (offset_addr); |
| if (!WriteRegisterUnsigned (context, eRegisterKindDWARF, dwarf_r0 + n, offset_addr)) |
| return false; |
| } |
| |
| // if t == 15 then |
| if (t == 15) |
| { |
| // if address<1:0> == ’00’ then LoadWritePC(data); else UNPREDICTABLE; |
| if (BitIsClear (address, 1) && BitIsClear (address, 0)) |
| { |
| context.type = eContextRegisterLoad; |
| context.SetRegisterPlusOffset (base_reg, address - Rn); |
| LoadWritePC (context, data); |
| } |
| else |
| return false; |
| } |
| // elsif UnalignedSupport() || address<1:0> = ’00’ then |
| else if (UnalignedSupport () || (BitIsClear (address, 1) && BitIsClear (address, 0))) |
| { |
| // R[t] = data; |
| context.type = eContextRegisterLoad; |
| context.SetRegisterPlusOffset (base_reg, address - Rn); |
| if (!WriteRegisterUnsigned (context, eRegisterKindDWARF, dwarf_r0 + t, data)) |
| return false; |
| } |
| else // Can only apply before ARMv7 |
| { |
| // if CurrentInstrSet() == InstrSet_ARM then |
| if (CurrentInstrSet () == eModeARM) |
| { |
| // R[t] = ROR(data, 8*UInt(address<1:0>)); |
| data = ROR (data, Bits32 (address, 1, 0)); |
| context.type = eContextRegisterLoad; |
| context.SetImmediate (data); |
| if (!WriteRegisterUnsigned (context, eRegisterKindDWARF, dwarf_r0 + t, data)) |
| return false; |
| } |
| else |
| { |
| // R[t] = bits(32) UNKNOWN; |
| WriteBits32Unknown (t); |
| } |
| } |
| } |
| return true; |
| } |
| |
| // LDRB (immediate, Thumb) |
| bool |
| EmulateInstructionARM::EmulateLDRBImmediate (ARMEncoding encoding) |
| { |
| #if 0 |
| if ConditionPassed() then |
| EncodingSpecificOperations(); NullCheckIfThumbEE(n); |
| offset_addr = if add then (R[n] + imm32) else (R[n] - imm32); |
| address = if index then offset_addr else R[n]; |
| R[t] = ZeroExtend(MemU[address,1], 32); |
| if wback then R[n] = offset_addr; |
| #endif |
| |
| bool success = false; |
| const uint32_t opcode = OpcodeAsUnsigned (&success); |
| if (!success) |
| return false; |
| |
| if (ConditionPassed ()) |
| { |
| uint32_t t; |
| uint32_t n; |
| uint32_t imm32; |
| bool index; |
| bool add; |
| bool wback; |
| |
| // EncodingSpecificOperations(); NullCheckIfThumbEE(n); |
| switch (encoding) |
| { |
| case eEncodingT1: |
| // t = UInt(Rt); n = UInt(Rn); imm32 = ZeroExtend(imm5, 32); |
| t = Bits32 (opcode, 2, 0); |
| n = Bits32 (opcode, 5, 3); |
| imm32 = Bits32 (opcode, 10, 6); |
| |
| // index = TRUE; add = TRUE; wback = FALSE; |
| index = true; |
| add = true; |
| wback= false; |
| |
| break; |
| |
| case eEncodingT2: |
| // if Rt == ’1111’ then SEE PLD; |
| // if Rn == ’1111’ then SEE LDRB (literal); |
| // t = UInt(Rt); n = UInt(Rn); imm32 = ZeroExtend(imm12, 32); |
| t = Bits32 (opcode, 15, 12); |
| n = Bits32 (opcode, 19, 16); |
| imm32 = Bits32 (opcode, 11, 0); |
| |
| // index = TRUE; add = TRUE; wback = FALSE; |
| index = true; |
| add = true; |
| wback = false; |
| |
| // if t == 13 then UNPREDICTABLE; |
| if (t == 13) |
| return false; |
| |
| break; |
| |
| case eEncodingT3: |
| // if Rt == ’1111’ && P == ’1’ && U == ’0’ && W == ’0’ then SEE PLD; |
| // if Rn == ’1111’ then SEE LDRB (literal); |
| // if P == ’1’ && U == ’1’ && W == ’0’ then SEE LDRBT; |
| // if P == ’0’ && W == ’0’ then UNDEFINED; |
| if (BitIsClear (opcode, 10) && BitIsClear (opcode, 8)) |
| return false; |
| |
| // t = UInt(Rt); n = UInt(Rn); imm32 = ZeroExtend(imm8, 32); |
| t = Bits32 (opcode, 15, 12); |
| n = Bits32 (opcode, 19, 16); |
| imm32 = Bits32 (opcode, 7, 0); |
| |
| // index = (P == ’1’); add = (U == ’1’); wback = (W == ’1’); |
| index = BitIsSet (opcode, 10); |
| add = BitIsSet (opcode, 9); |
| wback = BitIsSet (opcode, 8); |
| |
| // if BadReg(t) || (wback && n == t) then UNPREDICTABLE; |
| if (BadReg (t) || (wback && (n == t))) |
| return false; |
| |
| break; |
| |
| default: |
| return false; |
| } |
| |
| uint32_t Rn = ReadRegisterUnsigned (eRegisterKindDWARF, dwarf_r0 + n, 0, &success); |
| if (!success) |
| return false; |
| |
| addr_t address; |
| addr_t offset_addr; |
| |
| // offset_addr = if add then (R[n] + imm32) else (R[n] - imm32); |
| if (add) |
| offset_addr = Rn + imm32; |
| else |
| offset_addr = Rn - imm32; |
| |
| // address = if index then offset_addr else R[n]; |
| if (index) |
| address = offset_addr; |
| else |
| address = Rn; |
| |
| // R[t] = ZeroExtend(MemU[address,1], 32); |
| Register base_reg; |
| Register data_reg; |
| base_reg.SetRegister (eRegisterKindDWARF, dwarf_r0 + n); |
| data_reg.SetRegister (eRegisterKindDWARF, dwarf_r0 + t); |
| |
| EmulateInstruction::Context context; |
| context.type = eContextRegisterLoad; |
| context.SetRegisterToRegisterPlusOffset (data_reg, base_reg, address - Rn); |
| |
| uint64_t data = MemURead (context, address, 1, 0, &success); |
| if (!success) |
| return false; |
| |
| if (!WriteRegisterUnsigned (context, eRegisterKindDWARF, dwarf_r0 + t, data)) |
| return false; |
| |
| // if wback then R[n] = offset_addr; |
| if (wback) |
| { |
| context.type = eContextAdjustBaseRegister; |
| context.SetAddress (offset_addr); |
| if (!WriteRegisterUnsigned (context, eRegisterKindDWARF, dwarf_r0 + n, offset_addr)) |
| return false; |
| } |
| } |
| return true; |
| } |
| |
| // LDRB (literal) calculates an address from the PC value and an immediate offset, loads a byte from memory, |
| // zero-extends it to form a 32-bit word and writes it to a register. |
| bool |
| EmulateInstructionARM::EmulateLDRBLiteral (ARMEncoding encoding) |
| { |
| #if 0 |
| if ConditionPassed() then |
| EncodingSpecificOperations(); NullCheckIfThumbEE(15); |
| base = Align(PC,4); |
| address = if add then (base + imm32) else (base - imm32); |
| R[t] = ZeroExtend(MemU[address,1], 32); |
| #endif |
| |
| bool success = false; |
| const uint32_t opcode = OpcodeAsUnsigned (&success); |
| if (!success) |
| return false; |
| |
| if (ConditionPassed ()) |
| { |
| uint32_t t; |
| uint32_t imm32; |
| bool add; |
| switch (encoding) |
| { |
| case eEncodingT1: |
| // if Rt == ’1111’ then SEE PLD; |
| // t = UInt(Rt); imm32 = ZeroExtend(imm12, 32); add = (U == ’1’); |
| t = Bits32 (opcode, 15, 12); |
| imm32 = Bits32 (opcode, 11, 0); |
| add = BitIsSet (opcode, 23); |
| |
| // if t == 13 then UNPREDICTABLE; |
| if (t == 13) |
| return false; |
| |
| break; |
| |
| case eEncodingA1: |
| // t == UInt(Rt); imm32 = ZeroExtend(imm12, 32); add = (U == ’1’); |
| t = Bits32 (opcode, 15, 12); |
| imm32 = Bits32 (opcode, 11, 0); |
| add = BitIsSet (opcode, 23); |
| |
| // if t == 15 then UNPREDICTABLE; |
| if (t == 15) |
| return false; |
| break; |
| |
| default: |
| return false; |
| } |
| |
| // base = Align(PC,4); |
| uint32_t pc_val = ReadRegisterUnsigned (eRegisterKindGeneric, LLDB_REGNUM_GENERIC_PC, 0, &success); |
| if (!success) |
| return false; |
| |
| uint32_t base = AlignPC (pc_val); |
| |
| addr_t address; |
| // address = if add then (base + imm32) else (base - imm32); |
| if (add) |
| address = base + imm32; |
| else |
| address = base - imm32; |
| |
| // R[t] = ZeroExtend(MemU[address,1], 32); |
| EmulateInstruction::Context context; |
| context.type = eContextRelativeBranchImmediate; |
| context.SetImmediate (address - base); |
| |
| uint64_t data = MemURead (context, address, 1, 0, &success); |
| if (!success) |
| return false; |
| |
| if (!WriteRegisterUnsigned (context, eRegisterKindDWARF, dwarf_r0 + t, data)) |
| return false; |
| } |
| return true; |
| } |
| |
| // LDRB (register) calculates an address from a base register value and an offset rigister value, loads a byte from |
| // memory, zero-extends it to form a 32-bit word, and writes it to a register. The offset register value can |
| // optionally be shifted. |
| bool |
| EmulateInstructionARM::EmulateLDRBRegister (ARMEncoding encoding) |
| { |
| #if 0 |
| if ConditionPassed() then |
| EncodingSpecificOperations(); NullCheckIfThumbEE(n); |
| offset = Shift(R[m], shift_t, shift_n, APSR.C); |
| offset_addr = if add then (R[n] + offset) else (R[n] - offset); |
| address = if index then offset_addr else R[n]; |
| R[t] = ZeroExtend(MemU[address,1],32); |
| if wback then R[n] = offset_addr; |
| #endif |
| |
| bool success = false; |
| const uint32_t opcode = OpcodeAsUnsigned (&success); |
| if (!success) |
| return false; |
| |
| if (ConditionPassed ()) |
| { |
| uint32_t t; |
| uint32_t n; |
| uint32_t m; |
| bool index; |
| bool add; |
| bool wback; |
| ARM_ShifterType shift_t; |
| uint32_t shift_n; |
| |
| // EncodingSpecificOperations(); NullCheckIfThumbEE(n); |
| switch (encoding) |
| { |
| case eEncodingT1: |
| // t = UInt(Rt); n = UInt(Rn); m = UInt(Rm); |
| t = Bits32 (opcode, 2, 0); |
| n = Bits32 (opcode, 5, 3); |
| m = Bits32 (opcode, 8, 6); |
| |
| // index = TRUE; add = TRUE; wback = FALSE; |
| index = true; |
| add = true; |
| wback = false; |
| |
| // (shift_t, shift_n) = (SRType_LSL, 0); |
| shift_t = SRType_LSL; |
| shift_n = 0; |
| break; |
| |
| case eEncodingT2: |
| // if Rt == ’1111’ then SEE PLD; |
| // if Rn == ’1111’ then SEE LDRB (literal); |
| // t = UInt(Rt); n = UInt(Rn); m = UInt(Rm); |
| t = Bits32 (opcode, 15, 12); |
| n = Bits32 (opcode, 19, 16); |
| m = Bits32 (opcode, 3, 0); |
| |
| // index = TRUE; add = TRUE; wback = FALSE; |
| index = true; |
| add = true; |
| wback = false; |
| |
| // (shift_t, shift_n) = (SRType_LSL, UInt(imm2)); |
| shift_t = SRType_LSL; |
| shift_n = Bits32 (opcode, 5, 4); |
| |
| // if t == 13 || BadReg(m) then UNPREDICTABLE; |
| if ((t == 13) || BadReg (m)) |
| return false; |
| break; |
| |
| case eEncodingA1: |
| { |
| // if P == ’0’ && W == ’1’ then SEE LDRBT; |
| // t = UInt(Rt); n = UInt(Rn); m = UInt(Rm); |
| t = Bits32 (opcode, 15, 12); |
| n = Bits32 (opcode, 19, 16); |
| m = Bits32 (opcode, 3, 0); |
| |
| // index = (P == ’1’); add = (U == ’1’); wback = (P == ’0’) || (W == ’1’); |
| index = BitIsSet (opcode, 24); |
| add = BitIsSet (opcode, 23); |
| wback = (BitIsClear (opcode, 24) || BitIsSet (opcode, 21)); |
| |
| // (shift_t, shift_n) = DecodeImmShift(type, imm5); |
| uint32_t type = Bits32 (opcode, 6, 5); |
| uint32_t imm5 = Bits32 (opcode, 11, 7); |
| shift_n = DecodeImmShift (type, imm5, shift_t); |
| |
| // if t == 15 || m == 15 then UNPREDICTABLE; |
| if ((t == 15) || (m == 15)) |
| return false; |
| |
| // if wback && (n == 15 || n == t) then UNPREDICTABLE; |
| if (wback && ((n == 15) || (n == t))) |
| return false; |
| } |
| break; |
| |
| default: |
| return false; |
| } |
| |
| addr_t offset_addr; |
| addr_t address; |
| |
| // offset = Shift(R[m], shift_t, shift_n, APSR.C); |
| uint32_t Rm = ReadRegisterUnsigned (eRegisterKindDWARF, dwarf_r0 + m, 0, &success); |
| if (!success) |
| return false; |
| |
| addr_t offset = Shift (Rm, shift_t, shift_n, APSR_C); |
| |
| // offset_addr = if add then (R[n] + offset) else (R[n] - offset); |
| uint32_t Rn = ReadRegisterUnsigned (eRegisterKindDWARF, dwarf_r0 + n, 0, &success); |
| if (!success) |
| return false; |
| |
| if (add) |
| offset_addr = Rn + offset; |
| else |
| offset_addr = Rn - offset; |
| |
| // address = if index then offset_addr else R[n]; |
| if (index) |
| address = offset_addr; |
| else |
| address = Rn; |
| |
| // R[t] = ZeroExtend(MemU[address,1],32); |
| Register base_reg; |
| base_reg.SetRegister (eRegisterKindDWARF, dwarf_r0 + n); |
| |
| EmulateInstruction::Context context; |
| context.type = eContextRegisterLoad; |
| context.SetRegisterPlusOffset (base_reg, address - Rn); |
| |
| uint64_t data = MemURead (context, address, 1, 0, &success); |
| if (!success) |
| return false; |
| |
| if (!WriteRegisterUnsigned (context, eRegisterKindDWARF, dwarf_r0 + t, data)) |
| return false; |
| |
| // if wback then R[n] = offset_addr; |
| if (wback) |
| { |
| context.type = eContextAdjustBaseRegister; |
| context.SetAddress (offset_addr); |
| if (!WriteRegisterUnsigned (context, eRegisterKindDWARF, dwarf_r0 + n, offset_addr)) |
| return false; |
| } |
| } |
| return true; |
| } |
| |
| // Bitwise Exclusive OR (immediate) performs a bitwise exclusive OR of a register value and an immediate value, |
| // and writes the result to the destination register. It can optionally update the condition flags based on |
| // the result. |
| bool |
| EmulateInstructionARM::EmulateEORImm (ARMEncoding encoding) |
| { |
| #if 0 |
| // ARM pseudo code... |
| if ConditionPassed() then |
| EncodingSpecificOperations(); |
| result = R[n] EOR imm32; |
| if d == 15 then // Can only occur for ARM encoding |
| ALUWritePC(result); // setflags is always FALSE here |
| else |
| R[d] = result; |
| if setflags then |
| APSR.N = result<31>; |
| APSR.Z = IsZeroBit(result); |
| APSR.C = carry; |
| // APSR.V unchanged |
| #endif |
| |
| bool success = false; |
| const uint32_t opcode = OpcodeAsUnsigned (&success); |
| if (!success) |
| return false; |
| |
| if (ConditionPassed()) |
| { |
| uint32_t Rd, Rn; |
| uint32_t imm32; // the immediate value to be ORed to the value obtained from Rn |
| bool setflags; |
| uint32_t carry; // the carry bit after ARM/Thumb Expand operation |
| switch (encoding) |
| { |
| case eEncodingT1: |
| Rd = Bits32(opcode, 11, 8); |
| Rn = Bits32(opcode, 19, 16); |
| setflags = BitIsSet(opcode, 20); |
| imm32 = ThumbExpandImm_C(opcode, APSR_C, carry); // (imm32, carry) = ThumbExpandImm(i:imm3:imm8, APSR.C) |
| // if Rd == '1111' && S == '1' then SEE TEQ (immediate); |
| if (Rd == 15 && setflags) |
| return EmulateTEQImm(eEncodingT1); |
| if (Rd == 13 || (Rd == 15 && !setflags) || BadReg(Rn)) |
| return false; |
| break; |
| case eEncodingA1: |
| Rd = Bits32(opcode, 15, 12); |
| Rn = Bits32(opcode, 19, 16); |
| setflags = BitIsSet(opcode, 20); |
| imm32 = ARMExpandImm_C(opcode, APSR_C, carry); // (imm32, carry) = ARMExpandImm(imm12, APSR.C) |
| // if Rd == '1111' && S == '1' then SEE SUBS PC, LR and related instructions; |
| // TODO: Emulate SUBS PC, LR and related instructions. |
| if (Rd == 15 && setflags) |
| return false; |
| break; |
| default: |
| return false; |
| } |
| |
| // Read the first operand. |
| uint32_t val1 = ReadCoreReg(Rn, &success); |
| if (!success) |
| return false; |
| |
| uint32_t result = val1 ^ imm32; |
| |
| EmulateInstruction::Context context; |
| context.type = EmulateInstruction::eContextImmediate; |
| context.SetNoArgs (); |
| |
| if (!WriteCoreRegOptionalFlags(context, result, Rd, setflags, carry)) |
| return false; |
| } |
| return true; |
| } |
| |
| // Bitwise Exclusive OR (register) performs a bitwise exclusive OR of a register value and an |
| // optionally-shifted register value, and writes the result to the destination register. |
| // It can optionally update the condition flags based on the result. |
| bool |
| EmulateInstructionARM::EmulateEORReg (ARMEncoding encoding) |
| { |
| #if 0 |
| // ARM pseudo code... |
| if ConditionPassed() then |
| EncodingSpecificOperations(); |
| (shifted, carry) = Shift_C(R[m], shift_t, shift_n, APSR.C); |
| result = R[n] EOR shifted; |
| if d == 15 then // Can only occur for ARM encoding |
| ALUWritePC(result); // setflags is always FALSE here |
| else |
| R[d] = result; |
| if setflags then |
| APSR.N = result<31>; |
| APSR.Z = IsZeroBit(result); |
| APSR.C = carry; |
| // APSR.V unchanged |
| #endif |
| |
| bool success = false; |
| const uint32_t opcode = OpcodeAsUnsigned (&success); |
| if (!success) |
| return false; |
| |
| if (ConditionPassed()) |
| { |
| uint32_t Rd, Rn, Rm; |
| ARM_ShifterType shift_t; |
| uint32_t shift_n; // the shift applied to the value read from Rm |
| bool setflags; |
| uint32_t carry; |
| switch (encoding) |
| { |
| case eEncodingT1: |
| Rd = Rn = Bits32(opcode, 2, 0); |
| Rm = Bits32(opcode, 5, 3); |
| setflags = !InITBlock(); |
| shift_t = SRType_LSL; |
| shift_n = 0; |
| break; |
| case eEncodingT2: |
| Rd = Bits32(opcode, 11, 8); |
| Rn = Bits32(opcode, 19, 16); |
| Rm = Bits32(opcode, 3, 0); |
| setflags = BitIsSet(opcode, 20); |
| shift_n = DecodeImmShiftThumb(opcode, shift_t); |
| // if Rd == '1111' && S == '1' then SEE TEQ (register); |
| if (Rd == 15 && setflags) |
| return EmulateTEQReg(eEncodingT1); |
| if (Rd == 13 || (Rd == 15 && !setflags) || BadReg(Rn) || BadReg(Rm)) |
| return false; |
| break; |
| case eEncodingA1: |
| Rd = Bits32(opcode, 15, 12); |
| Rn = Bits32(opcode, 19, 16); |
| Rm = Bits32(opcode, 3, 0); |
| setflags = BitIsSet(opcode, 20); |
| shift_n = DecodeImmShiftARM(opcode, shift_t); |
| // if Rd == '1111' && S == '1' then SEE SUBS PC, LR and related instructions; |
| // TODO: Emulate SUBS PC, LR and related instructions. |
| if (Rd == 15 && setflags) |
| return false; |
| break; |
| default: |
| return false; |
| } |
| |
| // Read the first operand. |
| uint32_t val1 = ReadCoreReg(Rn, &success); |
| if (!success) |
| return false; |
| |
| // Read the second operand. |
| uint32_t val2 = ReadCoreReg(Rm, &success); |
| if (!success) |
| return false; |
| |
| uint32_t shifted = Shift_C(val2, shift_t, shift_n, APSR_C, carry); |
| uint32_t result = val1 ^ shifted; |
| |
| EmulateInstruction::Context context; |
| context.type = EmulateInstruction::eContextImmediate; |
| context.SetNoArgs (); |
| |
| if (!WriteCoreRegOptionalFlags(context, result, Rd, setflags, carry)) |
| return false; |
| } |
| return true; |
| } |
| |
| // Bitwise OR (immediate) performs a bitwise (inclusive) OR of a register value and an immediate value, and |
| // writes the result to the destination register. It can optionally update the condition flags based |
| // on the result. |
| bool |
| EmulateInstructionARM::EmulateORRImm (ARMEncoding encoding) |
| { |
| #if 0 |
| // ARM pseudo code... |
| if ConditionPassed() then |
| EncodingSpecificOperations(); |
| result = R[n] OR imm32; |
| if d == 15 then // Can only occur for ARM encoding |
| ALUWritePC(result); // setflags is always FALSE here |
| else |
| R[d] = result; |
| if setflags then |
| APSR.N = result<31>; |
| APSR.Z = IsZeroBit(result); |
| APSR.C = carry; |
| // APSR.V unchanged |
| #endif |
| |
| bool success = false; |
| const uint32_t opcode = OpcodeAsUnsigned (&success); |
| if (!success) |
| return false; |
| |
| if (ConditionPassed()) |
| { |
| uint32_t Rd, Rn; |
| uint32_t imm32; // the immediate value to be ORed to the value obtained from Rn |
| bool setflags; |
| uint32_t carry; // the carry bit after ARM/Thumb Expand operation |
| switch (encoding) |
| { |
| case eEncodingT1: |
| Rd = Bits32(opcode, 11, 8); |
| Rn = Bits32(opcode, 19, 16); |
| setflags = BitIsSet(opcode, 20); |
| imm32 = ThumbExpandImm_C(opcode, APSR_C, carry); // (imm32, carry) = ThumbExpandImm(i:imm3:imm8, APSR.C) |
| // if Rn == ‘1111’ then SEE MOV (immediate); |
| if (Rn == 15) |
| return EmulateMOVRdImm(eEncodingT2); |
| if (BadReg(Rd) || Rn == 13) |
| return false; |
| break; |
| case eEncodingA1: |
| Rd = Bits32(opcode, 15, 12); |
| Rn = Bits32(opcode, 19, 16); |
| setflags = BitIsSet(opcode, 20); |
| imm32 = ARMExpandImm_C(opcode, APSR_C, carry); // (imm32, carry) = ARMExpandImm(imm12, APSR.C) |
| // TODO: Emulate SUBS PC, LR and related instructions. |
| if (Rd == 15 && setflags) |
| return false; |
| break; |
| default: |
| return false; |
| } |
| |
| // Read the first operand. |
| uint32_t val1 = ReadCoreReg(Rn, &success); |
| if (!success) |
| return false; |
| |
| uint32_t result = val1 | imm32; |
| |
| EmulateInstruction::Context context; |
| context.type = EmulateInstruction::eContextImmediate; |
| context.SetNoArgs (); |
| |
| if (!WriteCoreRegOptionalFlags(context, result, Rd, setflags, carry)) |
| return false; |
| } |
| return true; |
| } |
| |
| // Bitwise OR (register) performs a bitwise (inclusive) OR of a register value and an optionally-shifted register |
| // value, and writes the result to the destination register. It can optionally update the condition flags based |
| // on the result. |
| bool |
| EmulateInstructionARM::EmulateORRReg (ARMEncoding encoding) |
| { |
| #if 0 |
| // ARM pseudo code... |
| if ConditionPassed() then |
| EncodingSpecificOperations(); |
| (shifted, carry) = Shift_C(R[m], shift_t, shift_n, APSR.C); |
| result = R[n] OR shifted; |
| if d == 15 then // Can only occur for ARM encoding |
| ALUWritePC(result); // setflags is always FALSE here |
| else |
| R[d] = result; |
| if setflags then |
| APSR.N = result<31>; |
| APSR.Z = IsZeroBit(result); |
| APSR.C = carry; |
| // APSR.V unchanged |
| #endif |
| |
| bool success = false; |
| const uint32_t opcode = OpcodeAsUnsigned (&success); |
| if (!success) |
| return false; |
| |
| if (ConditionPassed()) |
| { |
| uint32_t Rd, Rn, Rm; |
| ARM_ShifterType shift_t; |
| uint32_t shift_n; // the shift applied to the value read from Rm |
| bool setflags; |
| uint32_t carry; |
| switch (encoding) |
| { |
| case eEncodingT1: |
| Rd = Rn = Bits32(opcode, 2, 0); |
| Rm = Bits32(opcode, 5, 3); |
| setflags = !InITBlock(); |
| shift_t = SRType_LSL; |
| shift_n = 0; |
| break; |
| case eEncodingT2: |
| Rd = Bits32(opcode, 11, 8); |
| Rn = Bits32(opcode, 19, 16); |
| Rm = Bits32(opcode, 3, 0); |
| setflags = BitIsSet(opcode, 20); |
| shift_n = DecodeImmShiftThumb(opcode, shift_t); |
| // if Rn == '1111' then SEE MOV (register); |
| if (Rn == 15) |
| return EmulateMOVRdRm(eEncodingT3); |
| if (BadReg(Rd) || Rn == 13 || BadReg(Rm)) |
| return false; |
| break; |
| case eEncodingA1: |
| Rd = Bits32(opcode, 15, 12); |
| Rn = Bits32(opcode, 19, 16); |
| Rm = Bits32(opcode, 3, 0); |
| setflags = BitIsSet(opcode, 20); |
| shift_n = DecodeImmShiftARM(opcode, shift_t); |
| // TODO: Emulate SUBS PC, LR and related instructions. |
| if (Rd == 15 && setflags) |
| return false; |
| break; |
| default: |
| return false; |
| } |
| |
| // Read the first operand. |
| uint32_t val1 = ReadCoreReg(Rn, &success); |
| if (!success) |
| return false; |
| |
| // Read the second operand. |
| uint32_t val2 = ReadCoreReg(Rm, &success); |
| if (!success) |
| return false; |
| |
| uint32_t shifted = Shift_C(val2, shift_t, shift_n, APSR_C, carry); |
| uint32_t result = val1 | shifted; |
| |
| EmulateInstruction::Context context; |
| context.type = EmulateInstruction::eContextImmediate; |
| context.SetNoArgs (); |
| |
| if (!WriteCoreRegOptionalFlags(context, result, Rd, setflags, carry)) |
| return false; |
| } |
| return true; |
| } |
| |
| // Reverse Subtract (immediate) subtracts a register value from an immediate value, and writes the result to |
| // the destination register. It can optionally update the condition flags based on the result. |
| bool |
| EmulateInstructionARM::EmulateRSBImm (ARMEncoding encoding) |
| { |
| #if 0 |
| // ARM pseudo code... |
| if ConditionPassed() then |
| EncodingSpecificOperations(); |
| (result, carry, overflow) = AddWithCarry(NOT(R[n]), imm32, '1'); |
| if d == 15 then // Can only occur for ARM encoding |
| ALUWritePC(result); // setflags is always FALSE here |
| else |
| R[d] = result; |
| if setflags then |
| APSR.N = result<31>; |
| APSR.Z = IsZeroBit(result); |
| APSR.C = carry; |
| APSR.V = overflow; |
| #endif |
| |
| bool success = false; |
| const uint32_t opcode = OpcodeAsUnsigned (&success); |
| if (!success) |
| return false; |
| |
| uint32_t Rd; // the destination register |
| uint32_t Rn; // the first operand |
| bool setflags; |
| uint32_t imm32; // the immediate value to be added to the value obtained from Rn |
| switch (encoding) { |
| case eEncodingT1: |
| Rd = Bits32(opcode, 2, 0); |
| Rn = Bits32(opcode, 5, 3); |
| setflags = !InITBlock(); |
| imm32 = 0; |
| break; |
| case eEncodingT2: |
| Rd = Bits32(opcode, 11, 8); |
| Rn = Bits32(opcode, 19, 16); |
| setflags = BitIsSet(opcode, 20); |
| imm32 = ThumbExpandImm(opcode); // imm32 = ThumbExpandImm(i:imm3:imm8) |
| if (BadReg(Rd) || BadReg(Rn)) |
| return false; |
| break; |
| case eEncodingA1: |
| Rd = Bits32(opcode, 15, 12); |
| Rn = Bits32(opcode, 19, 16); |
| setflags = BitIsSet(opcode, 20); |
| imm32 = ARMExpandImm(opcode); // imm32 = ARMExpandImm(imm12) |
| // if Rd == '1111' && S == '1' then SEE SUBS PC, LR and related instructions; |
| // TODO: Emulate SUBS PC, LR and related instructions. |
| if (Rd == 15 && setflags) |
| return false; |
| break; |
| default: |
| return false; |
| } |
| // Read the register value from the operand register Rn. |
| uint32_t reg_val = ReadCoreReg(Rn, &success); |
| if (!success) |
| return false; |
| |
| AddWithCarryResult res = AddWithCarry(~reg_val, imm32, 1); |
| |
| EmulateInstruction::Context context; |
| context.type = EmulateInstruction::eContextImmediate; |
| context.SetNoArgs (); |
| |
| if (!WriteCoreRegOptionalFlags(context, res.result, Rd, setflags, res.carry_out, res.overflow)) |
| return false; |
| |
| return true; |
| } |
| |
| // Reverse Subtract (register) subtracts a register value from an optionally-shifted register value, and writes the |
| // result to the destination register. It can optionally update the condition flags based on the result. |
| bool |
| EmulateInstructionARM::EmulateRSBReg (ARMEncoding encoding) |
| { |
| #if 0 |
| // ARM pseudo code... |
| if ConditionPassed() then |
| EncodingSpecificOperations(); |
| shifted = Shift(R[m], shift_t, shift_n, APSR.C); |
| (result, carry, overflow) = AddWithCarry(NOT(R[n]), shifted, '1'); |
| if d == 15 then // Can only occur for ARM encoding |
| ALUWritePC(result); // setflags is always FALSE here |
| else |
| R[d] = result; |
| if setflags then |
| APSR.N = result<31>; |
| APSR.Z = IsZeroBit(result); |
| APSR.C = carry; |
| APSR.V = overflow; |
| #endif |
| |
| bool success = false; |
| const uint32_t opcode = OpcodeAsUnsigned (&success); |
| if (!success) |
| return false; |
| |
| uint32_t Rd; // the destination register |
| uint32_t Rn; // the first operand |
| uint32_t Rm; // the second operand |
| bool setflags; |
| ARM_ShifterType shift_t; |
| uint32_t shift_n; // the shift applied to the value read from Rm |
| switch (encoding) { |
| case eEncodingT1: |
| Rd = Bits32(opcode, 11, 8); |
| Rn = Bits32(opcode, 19, 16); |
| Rm = Bits32(opcode, 3, 0); |
| setflags = BitIsSet(opcode, 20); |
| shift_n = DecodeImmShiftThumb(opcode, shift_t); |
| // if (BadReg(d) || BadReg(m)) then UNPREDICTABLE; |
| if (BadReg(Rd) || BadReg(Rn) || BadReg(Rm)) |
| return false; |
| break; |
| case eEncodingA1: |
| Rd = Bits32(opcode, 15, 12); |
| Rn = Bits32(opcode, 19, 16); |
| Rm = Bits32(opcode, 3, 0); |
| setflags = BitIsSet(opcode, 20); |
| shift_n = DecodeImmShiftARM(opcode, shift_t); |
| // if Rd == '1111' && S == '1' then SEE SUBS PC, LR and related instructions; |
| // TODO: Emulate SUBS PC, LR and related instructions. |
| if (Rd == 15 && setflags) |
| return false; |
| break; |
| default: |
| return false; |
| } |
| // Read the register value from register Rn. |
| uint32_t val1 = ReadCoreReg(Rn, &success); |
| if (!success) |
| return false; |
| |
| // Read the register value from register Rm. |
| uint32_t val2 = ReadCoreReg(Rm, &success); |
| if (!success) |
| return false; |
| |
| uint32_t shifted = Shift(val2, shift_t, shift_n, APSR_C); |
| AddWithCarryResult res = AddWithCarry(~val1, shifted, 1); |
| |
| EmulateInstruction::Context context; |
| context.type = EmulateInstruction::eContextImmediate; |
| context.SetNoArgs(); |
| if (!WriteCoreRegOptionalFlags(context, res.result, Rd, setflags, res.carry_out, res.overflow)) |
| return false; |
| |
| return true; |
| } |
| |
| // Test Equivalence (immediate) performs a bitwise exclusive OR operation on a register value and an |
| // immediate value. It updates the condition flags based on the result, and discards the result. |
| bool |
| EmulateInstructionARM::EmulateTEQImm (ARMEncoding encoding) |
| { |
| #if 0 |
| // ARM pseudo code... |
| if ConditionPassed() then |
| EncodingSpecificOperations(); |
| result = R[n] EOR imm32; |
| APSR.N = result<31>; |
| APSR.Z = IsZeroBit(result); |
| APSR.C = carry; |
| // APSR.V unchanged |
| #endif |
| |
| bool success = false; |
| const uint32_t opcode = OpcodeAsUnsigned (&success); |
| if (!success) |
| return false; |
| |
| if (ConditionPassed()) |
| { |
| uint32_t Rn; |
| uint32_t imm32; // the immediate value to be ANDed to the value obtained from Rn |
| uint32_t carry; // the carry bit after ARM/Thumb Expand operation |
| switch (encoding) |
| { |
| case eEncodingT1: |
| Rn = Bits32(opcode, 19, 16); |
| imm32 = ThumbExpandImm_C(opcode, APSR_C, carry); // (imm32, carry) = ThumbExpandImm(i:imm3:imm8, APSR.C) |
| if (BadReg(Rn)) |
| return false; |
| break; |
| case eEncodingA1: |
| Rn = Bits32(opcode, 19, 16); |
| imm32 = ARMExpandImm_C(opcode, APSR_C, carry); // (imm32, carry) = ARMExpandImm(imm12, APSR.C) |
| break; |
| default: |
| return false; |
| } |
| |
| // Read the first operand. |
| uint32_t val1 = ReadCoreReg(Rn, &success); |
| if (!success) |
| return false; |
| |
| uint32_t result = val1 ^ imm32; |
| |
| EmulateInstruction::Context context; |
| context.type = EmulateInstruction::eContextImmediate; |
| context.SetNoArgs (); |
| |
| if (!WriteFlags(context, result, carry)) |
| return false; |
| } |
| return true; |
| } |
| |
| // Test Equivalence (register) performs a bitwise exclusive OR operation on a register value and an |
| // optionally-shifted register value. It updates the condition flags based on the result, and discards |
| // the result. |
| bool |
| EmulateInstructionARM::EmulateTEQReg (ARMEncoding encoding) |
| { |
| #if 0 |
| // ARM pseudo code... |
| if ConditionPassed() then |
| EncodingSpecificOperations(); |
| (shifted, carry) = Shift_C(R[m], shift_t, shift_n, APSR.C); |
| result = R[n] EOR shifted; |
| APSR.N = result<31>; |
| APSR.Z = IsZeroBit(result); |
| APSR.C = carry; |
| // APSR.V unchanged |
| #endif |
| |
| bool success = false; |
| const uint32_t opcode = OpcodeAsUnsigned (&success); |
| if (!success) |
| return false; |
| |
| if (ConditionPassed()) |
| { |
| uint32_t Rn, Rm; |
| ARM_ShifterType shift_t; |
| uint32_t shift_n; // the shift applied to the value read from Rm |
| uint32_t carry; |
| switch (encoding) |
| { |
| case eEncodingT1: |
| Rn = Bits32(opcode, 19, 16); |
| Rm = Bits32(opcode, 3, 0); |
| shift_n = DecodeImmShiftThumb(opcode, shift_t); |
| if (BadReg(Rn) || BadReg(Rm)) |
| return false; |
| break; |
| case eEncodingA1: |
| Rn = Bits32(opcode, 19, 16); |
| Rm = Bits32(opcode, 3, 0); |
| shift_n = DecodeImmShiftARM(opcode, shift_t); |
| break; |
| default: |
| return false; |
| } |
| |
| // Read the first operand. |
| uint32_t val1 = ReadCoreReg(Rn, &success); |
| if (!success) |
| return false; |
| |
| // Read the second operand. |
| uint32_t val2 = ReadCoreReg(Rm, &success); |
| if (!success) |
| return false; |
| |
| uint32_t shifted = Shift_C(val2, shift_t, shift_n, APSR_C, carry); |
| uint32_t result = val1 ^ shifted; |
| |
| EmulateInstruction::Context context; |
| context.type = EmulateInstruction::eContextImmediate; |
| context.SetNoArgs (); |
| |
| if (!WriteFlags(context, result, carry)) |
| return false; |
| } |
| return true; |
| } |
| |
| // Test (immediate) performs a bitwise AND operation on a register value and an immediate value. |
| // It updates the condition flags based on the result, and discards the result. |
| bool |
| EmulateInstructionARM::EmulateTSTImm (ARMEncoding encoding) |
| { |
| #if 0 |
| // ARM pseudo code... |
| if ConditionPassed() then |
| EncodingSpecificOperations(); |
| result = R[n] AND imm32; |
| APSR.N = result<31>; |
| APSR.Z = IsZeroBit(result); |
| APSR.C = carry; |
| // APSR.V unchanged |
| #endif |
| |
| bool success = false; |
| const uint32_t opcode = OpcodeAsUnsigned (&success); |
| if (!success) |
| return false; |
| |
| if (ConditionPassed()) |
| { |
| uint32_t Rn; |
| uint32_t imm32; // the immediate value to be ANDed to the value obtained from Rn |
| uint32_t carry; // the carry bit after ARM/Thumb Expand operation |
| switch (encoding) |
| { |
| case eEncodingT1: |
| Rn = Bits32(opcode, 19, 16); |
| imm32 = ThumbExpandImm_C(opcode, APSR_C, carry); // (imm32, carry) = ThumbExpandImm(i:imm3:imm8, APSR.C) |
| if (BadReg(Rn)) |
| return false; |
| break; |
| case eEncodingA1: |
| Rn = Bits32(opcode, 19, 16); |
| imm32 = ARMExpandImm_C(opcode, APSR_C, carry); // (imm32, carry) = ARMExpandImm(imm12, APSR.C) |
| break; |
| default: |
| return false; |
| } |
| |
| // Read the first operand. |
| uint32_t val1 = ReadCoreReg(Rn, &success); |
| if (!success) |
| return false; |
| |
| uint32_t result = val1 & imm32; |
| |
| EmulateInstruction::Context context; |
| context.type = EmulateInstruction::eContextImmediate; |
| context.SetNoArgs (); |
| |
| if (!WriteFlags(context, result, carry)) |
| return false; |
| } |
| return true; |
| } |
| |
| // Test (register) performs a bitwise AND operation on a register value and an optionally-shifted register value. |
| // It updates the condition flags based on the result, and discards the result. |
| bool |
| EmulateInstructionARM::EmulateTSTReg (ARMEncoding encoding) |
| { |
| #if 0 |
| // ARM pseudo code... |
| if ConditionPassed() then |
| EncodingSpecificOperations(); |
| (shifted, carry) = Shift_C(R[m], shift_t, shift_n, APSR.C); |
| result = R[n] AND shifted; |
| APSR.N = result<31>; |
| APSR.Z = IsZeroBit(result); |
| APSR.C = carry; |
| // APSR.V unchanged |
| #endif |
| |
| bool success = false; |
| const uint32_t opcode = OpcodeAsUnsigned (&success); |
| if (!success) |
| return false; |
| |
| if (ConditionPassed()) |
| { |
| uint32_t Rn, Rm; |
| ARM_ShifterType shift_t; |
| uint32_t shift_n; // the shift applied to the value read from Rm |
| uint32_t carry; |
| switch (encoding) |
| { |
| case eEncodingT1: |
| Rn = Bits32(opcode, 2, 0); |
| Rm = Bits32(opcode, 5, 3); |
| shift_t = SRType_LSL; |
| shift_n = 0; |
| break; |
| case eEncodingT2: |
| Rn = Bits32(opcode, 19, 16); |
| Rm = Bits32(opcode, 3, 0); |
| shift_n = DecodeImmShiftThumb(opcode, shift_t); |
| if (BadReg(Rn) || BadReg(Rm)) |
| return false; |
| break; |
| case eEncodingA1: |
| Rn = Bits32(opcode, 19, 16); |
| Rm = Bits32(opcode, 3, 0); |
| shift_n = DecodeImmShiftARM(opcode, shift_t); |
| break; |
| default: |
| return false; |
| } |
| |
| // Read the first operand. |
| uint32_t val1 = ReadCoreReg(Rn, &success); |
| if (!success) |
| return false; |
| |
| // Read the second operand. |
| uint32_t val2 = ReadCoreReg(Rm, &success); |
| if (!success) |
| return false; |
| |
| uint32_t shifted = Shift_C(val2, shift_t, shift_n, APSR_C, carry); |
| uint32_t result = val1 & shifted; |
| |
| EmulateInstruction::Context context; |
| context.type = EmulateInstruction::eContextImmediate; |
| context.SetNoArgs (); |
| |
| if (!WriteFlags(context, result, carry)) |
| return false; |
| } |
| return true; |
| } |
| |
| EmulateInstructionARM::ARMOpcode* |
| EmulateInstructionARM::GetARMOpcodeForInstruction (const uint32_t opcode) |
| { |
| static ARMOpcode |
| g_arm_opcodes[] = |
| { |
| //---------------------------------------------------------------------- |
| // Prologue instructions |
| //---------------------------------------------------------------------- |
| |
| // push register(s) |
| { 0x0fff0000, 0x092d0000, ARMvAll, eEncodingA1, eSize32, &EmulateInstructionARM::EmulatePUSH, "push <registers>" }, |
| { 0x0fff0fff, 0x052d0004, ARMvAll, eEncodingA2, eSize32, &EmulateInstructionARM::EmulatePUSH, "push <register>" }, |
| |
| // set r7 to point to a stack offset |
| { 0x0ffff000, 0x028d7000, ARMvAll, eEncodingA1, eSize32, &EmulateInstructionARM::EmulateADDRdSPImm, "add r7, sp, #<const>" }, |
| { 0x0ffff000, 0x024c7000, ARMvAll, eEncodingA1, eSize32, &EmulateInstructionARM::EmulateSUBR7IPImm, "sub r7, ip, #<const>"}, |
| // copy the stack pointer to ip |
| { 0x0fffffff, 0x01a0c00d, ARMvAll, eEncodingA1, eSize32, &EmulateInstructionARM::EmulateMOVRdSP, "mov ip, sp" }, |
| { 0x0ffff000, 0x028dc000, ARMvAll, eEncodingA1, eSize32, &EmulateInstructionARM::EmulateADDRdSPImm, "add ip, sp, #<const>" }, |
| { 0x0ffff000, 0x024dc000, ARMvAll, eEncodingA1, eSize32, &EmulateInstructionARM::EmulateSUBIPSPImm, "sub ip, sp, #<const>"}, |
| |
| // adjust the stack pointer |
| { 0x0ffff000, 0x024dd000, ARMvAll, eEncodingA1, eSize32, &EmulateInstructionARM::EmulateSUBSPImm, "sub sp, sp, #<const>"}, |
| |
| // push one register |
| // if Rn == '1101' && imm12 == '000000000100' then SEE PUSH; |
| { 0x0fff0000, 0x052d0000, ARMvAll, eEncodingA1, eSize32, &EmulateInstructionARM::EmulateSTRRtSP, "str Rt, [sp, #-imm12]!" }, |
| |
| // vector push consecutive extension register(s) |
| { 0x0fbf0f00, 0x0d2d0b00, ARMV6T2_ABOVE, eEncodingA1, eSize32, &EmulateInstructionARM::EmulateVPUSH, "vpush.64 <list>"}, |
| { 0x0fbf0f00, 0x0d2d0a00, ARMV6T2_ABOVE, eEncodingA2, eSize32, &EmulateInstructionARM::EmulateVPUSH, "vpush.32 <list>"}, |
| |
| //---------------------------------------------------------------------- |
| // Epilogue instructions |
| //---------------------------------------------------------------------- |
| |
| { 0x0fff0000, 0x08bd0000, ARMvAll, eEncodingA1, eSize32, &EmulateInstructionARM::EmulatePOP, "pop <registers>"}, |
| { 0x0fff0fff, 0x049d0004, ARMvAll, eEncodingA2, eSize32, &EmulateInstructionARM::EmulatePOP, "pop <register>"}, |
| { 0x0fbf0f00, 0x0cbd0b00, ARMV6T2_ABOVE, eEncodingA1, eSize32, &EmulateInstructionARM::EmulateVPOP, "vpop.64 <list>"}, |
| { 0x0fbf0f00, 0x0cbd0a00, ARMV6T2_ABOVE, eEncodingA2, eSize32, &EmulateInstructionARM::EmulateVPOP, "vpop.32 <list>"}, |
| |
| //---------------------------------------------------------------------- |
| // Supervisor Call (previously Software Interrupt) |
| //---------------------------------------------------------------------- |
| { 0x0f000000, 0x0f000000, ARMvAll, eEncodingA1, eSize32, &EmulateInstructionARM::EmulateSVC, "svc #imm24"}, |
| |
| //---------------------------------------------------------------------- |
| // Branch instructions |
| //---------------------------------------------------------------------- |
| { 0x0f000000, 0x0a000000, ARMvAll, eEncodingA1, eSize32, &EmulateInstructionARM::EmulateSVC, "b #imm24"}, |
| // To resolve ambiguity, "blx <label>" should come before "bl <label>". |
| { 0xfe000000, 0xfa000000, ARMV5_ABOVE, eEncodingA2, eSize32, &EmulateInstructionARM::EmulateBLXImmediate, "blx <label>"}, |
| { 0x0f000000, 0x0b000000, ARMvAll, eEncodingA1, eSize32, &EmulateInstructionARM::EmulateBLXImmediate, "bl <label>"}, |
| { 0x0ffffff0, 0x012fff30, ARMV5_ABOVE, eEncodingA1, eSize32, &EmulateInstructionARM::EmulateBLXRm, "blx <Rm>"}, |
| // for example, "bx lr" |
| { 0x0ffffff0, 0x012fff10, ARMvAll, eEncodingA1, eSize32, &EmulateInstructionARM::EmulateBXRm, "bx <Rm>"}, |
| |
| //---------------------------------------------------------------------- |
| // Data-processing instructions |
| //---------------------------------------------------------------------- |
| // adc (immediate) |
| { 0x0fe00000, 0x02a00000, ARMvAll, eEncodingA1, eSize32, &EmulateInstructionARM::EmulateADCImm, "adc{s}<c> <Rd>, <Rn>, #const"}, |
| // adc (register) |
| { 0x0fe00010, 0x00a00000, ARMvAll, eEncodingA1, eSize32, &EmulateInstructionARM::EmulateADCReg, "adc{s}<c> <Rd>, <Rn>, <Rm> {,<shift>}"}, |
| // add (immediate) |
| { 0x0fe00000, 0x02800000, ARMvAll, eEncodingA1, eSize32, &EmulateInstructionARM::EmulateADDImmARM, "add{s}<c> <Rd>, <Rn>, #const"}, |
| // add (register) |
| { 0x0fe00010, 0x00800000, ARMvAll, eEncodingA1, eSize32, &EmulateInstructionARM::EmulateADDReg, "add{s}<c> <Rd>, <Rn>, <Rm> {,<shift>}"}, |
| // and (immediate) |
| { 0x0fe00000, 0x02000000, ARMvAll, eEncodingA1, eSize32, &EmulateInstructionARM::EmulateANDImm, "and{s}<c> <Rd>, <Rn>, #const"}, |
| // and (register) |
| { 0x0fe00010, 0x00000000, ARMvAll, eEncodingA1, eSize32, &EmulateInstructionARM::EmulateANDReg, "and{s}<c> <Rd>, <Rn>, <Rm> {,<shift>}"}, |
| // eor (immediate) |
| { 0x0fe00000, 0x02200000, ARMvAll, eEncodingA1, eSize32, &EmulateInstructionARM::EmulateEORImm, "eor{s}<c> <Rd>, <Rn>, #const"}, |
| // eor (register) |
| { 0x0fe00010, 0x00200000, ARMvAll, eEncodingA1, eSize32, &EmulateInstructionARM::EmulateEORReg, "eor{s}<c> <Rd>, <Rn>, <Rm> {,<shift>}"}, |
| // orr (immediate) |
| { 0x0fe00000, 0x03800000, ARMvAll, eEncodingA1, eSize32, &EmulateInstructionARM::EmulateORRImm, "orr{s}<c> <Rd>, <Rn>, #const"}, |
| // orr (register) |
| { 0x0fe00010, 0x01800000, ARMvAll, eEncodingA1, eSize32, &EmulateInstructionARM::EmulateORRReg, "orr{s}<c> <Rd>, <Rn>, <Rm> {,<shift>}"}, |
| // rsb (immediate) |
| { 0x0fe00000, 0x02600000, ARMvAll, eEncodingA1, eSize32, &EmulateInstructionARM::EmulateRSBImm, "rsb{s}<c> <Rd>, <Rn>, #<const>"}, |
| // rsb (register) |
| { 0x0fe00010, 0x00600000, ARMvAll, eEncodingA1, eSize32, &EmulateInstructionARM::EmulateRSBReg, "rsb{s}<c> <Rd>, <Rn>, <Rm> {,<shift>}"}, |
| // teq (immediate) |
| { 0x0ff0f000, 0x03300000, ARMvAll, eEncodingA1, eSize32, &EmulateInstructionARM::EmulateTEQImm, "teq<c> <Rn>, #const"}, |
| // teq (register) |
| { 0x0ff0f010, 0x01300000, ARMvAll, eEncodingA1, eSize32, &EmulateInstructionARM::EmulateTEQReg, "teq<c> <Rn>, <Rm> {,<shift>}"}, |
| // tst (immediate) |
| { 0x0ff0f000, 0x03100000, ARMvAll, eEncodingA1, eSize32, &EmulateInstructionARM::EmulateTSTImm, "tst<c> <Rn>, #const"}, |
| // tst (register) |
| { 0x0ff0f010, 0x01100000, ARMvAll, eEncodingA1, eSize32, &EmulateInstructionARM::EmulateTSTReg, "tst<c> <Rn>, <Rm> {,<shift>}"}, |
| |
| |
| // mvn (immediate) |
| { 0x0fef0000, 0x03e00000, ARMvAll, eEncodingA1, eSize32, &EmulateInstructionARM::EmulateMVNImm, "mvn{s}<c> <Rd>, #<const>"}, |
| // mvn (register) |
| { 0x0fef0010, 0x01e00000, ARMvAll, eEncodingA1, eSize32, &EmulateInstructionARM::EmulateMVNReg, "mvn{s}<c> <Rd>, <Rm> {,<shift>}"}, |
| // cmn (immediate) |
| { 0x0ff0f000, 0x03700000, ARMvAll, eEncodingA1, eSize32, &EmulateInstructionARM::EmulateCMNImm, "cmn<c> <Rn>, #<const>"}, |
| // cmn (register) |
| { 0x0ff0f010, 0x01700000, ARMvAll, eEncodingA1, eSize32, &EmulateInstructionARM::EmulateCMNReg, "cmn<c> <Rn>, <Rm> {,<shift>}"}, |
| // cmp (immediate) |
| { 0x0ff0f000, 0x03500000, ARMvAll, eEncodingA1, eSize32, &EmulateInstructionARM::EmulateCMPImm, "cmp<c> <Rn>, #<const>"}, |
| // cmp (register) |
| { 0x0ff0f010, 0x01500000, ARMvAll, eEncodingA1, eSize32, &EmulateInstructionARM::EmulateCMPReg, "cmp<c> <Rn>, <Rm> {,<shift>}"}, |
| // asr (immediate) |
| { 0x0fef0070, 0x01a00040, ARMvAll, eEncodingA1, eSize32, &EmulateInstructionARM::EmulateASRImm, "asr{s}<c> <Rd>, <Rm>, #imm"}, |
| // asr (register) |
| { 0x0fef00f0, 0x01a00050, ARMvAll, eEncodingA1, eSize32, &EmulateInstructionARM::EmulateASRReg, "asr{s}<c> <Rd>, <Rn>, <Rm>"}, |
| // lsl (immediate) |
| { 0x0fef0070, 0x01a00000, ARMvAll, eEncodingA1, eSize32, &EmulateInstructionARM::EmulateLSLImm, "lsl{s}<c> <Rd>, <Rm>, #imm"}, |
| // lsl (register) |
| { 0x0fef00f0, 0x01a00010, ARMvAll, eEncodingA1, eSize32, &EmulateInstructionARM::EmulateLSLReg, "lsl{s}<c> <Rd>, <Rn>, <Rm>"}, |
| // lsr (immediate) |
| { 0x0fef0070, 0x01a00020, ARMvAll, eEncodingA1, eSize32, &EmulateInstructionARM::EmulateLSRImm, "lsr{s}<c> <Rd>, <Rm>, #imm"}, |
| // lsr (register) |
| { 0x0fef00f0, 0x01a00050, ARMvAll, eEncodingA1, eSize32, &EmulateInstructionARM::EmulateLSRReg, "lsr{s}<c> <Rd>, <Rn>, <Rm>"}, |
| // rrx is a special case encoding of ror (immediate) |
| { 0x0fef0ff0, 0x01a00060, ARMvAll, eEncodingA1, eSize32, &EmulateInstructionARM::EmulateRRX, "rrx{s}<c> <Rd>, <Rm>"}, |
| // ror (immediate) |
| { 0x0fef0070, 0x01a00060, ARMvAll, eEncodingA1, eSize32, &EmulateInstructionARM::EmulateRORImm, "ror{s}<c> <Rd>, <Rm>, #imm"}, |
| // ror (register) |
| { 0x0fef00f0, 0x01a00070, ARMvAll, eEncodingA1, eSize32, &EmulateInstructionARM::EmulateRORReg, "ror{s}<c> <Rd>, <Rn>, <Rm>"}, |
| |
| //---------------------------------------------------------------------- |
| // Load instructions |
| //---------------------------------------------------------------------- |
| { 0x0fd00000, 0x08900000, ARMvAll, eEncodingA1, eSize32, &EmulateInstructionARM::EmulateLDM, "ldm<c> <Rn>{!} <registers>" }, |
| { 0x0fd00000, 0x08100000, ARMvAll, eEncodingA1, eSize32, &EmulateInstructionARM::EmulateLDMDA, "ldmda<c> <Rn>{!} <registers>" }, |
| { 0x0fd00000, 0x09100000, ARMvAll, eEncodingA1, eSize32, &EmulateInstructionARM::EmulateLDMDB, "ldmdb<c> <Rn>{!} <registers>" }, |
| { 0x0fd00000, 0x09900000, ARMvAll, eEncodingA1, eSize32, &EmulateInstructionARM::EmulateLDMIB, "ldmib<c> <Rn<{!} <registers>" }, |
| { 0x0e500000, 0x04100000, ARMvAll, eEncodingA1, eSize32, &EmulateInstructionARM::EmulateLDRImmediateARM, "ldr<c> <Rt> [<Rn> {#+/-<imm12>}]" }, |
| { 0x0e500010, 0x06100000, ARMvAll, eEncodingA1, eSize32, &EmulateInstructionARM::EmulateLDRRegister, "ldr<c> <Rt> [<Rn> +/-<Rm> {<shift>}] {!}" }, |
| { 0x0e5f0000, 0x045f0000, ARMvAll, eEncodingA1, eSize32, &EmulateInstructionARM::EmulateLDRBLiteral, "ldrb<c> <Rt>, [...]"}, |
| { 0xfe500010, 0x06500000, ARMvAll, eEncodingA1, eSize32, &EmulateInstructionARM::EmulateLDRBRegister, "ldrb<c> <Rt>, [<Rn>,+/-<Rm>{, <shift>}]{!}" }, |
| |
| //---------------------------------------------------------------------- |
| // Store instructions |
| //---------------------------------------------------------------------- |
| { 0x0fd00000, 0x08800000, ARMvAll, eEncodingA1, eSize32, &EmulateInstructionARM::EmulateSTM, "stm<c> <Rn>{!} <registers>" }, |
| { 0x0fd00000, 0x08000000, ARMvAll, eEncodingA1, eSize32, &EmulateInstructionARM::EmulateSTMDA, "stmda<c> <Rn>{!} <registers>" }, |
| { 0x0fd00000, 0x09000000, ARMvAll, eEncodingA1, eSize32, &EmulateInstructionARM::EmulateSTMDB, "stmdb<c> <Rn>{!} <registers>" }, |
| { 0x0fd00000, 0x09800000, ARMvAll, eEncodingA1, eSize32, &EmulateInstructionARM::EmulateSTMIB, "stmib<c> <Rn>{!} <registers>" }, |
| { 0x0e500010, 0x06000000, ARMvAll, eEncodingA1, eSize32, &EmulateInstructionARM::EmulateSTRRegister, "str<c> <Rt> [<Rn> +/-<Rm> {<shift>}]{!}" } |
| |
| |
| }; |
| static const size_t k_num_arm_opcodes = sizeof(g_arm_opcodes)/sizeof(ARMOpcode); |
| |
| for (size_t i=0; i<k_num_arm_opcodes; ++i) |
| { |
| if ((g_arm_opcodes[i].mask & opcode) == g_arm_opcodes[i].value) |
| return &g_arm_opcodes[i]; |
| } |
| return NULL; |
| } |
| |
| |
| EmulateInstructionARM::ARMOpcode* |
| EmulateInstructionARM::GetThumbOpcodeForInstruction (const uint32_t opcode) |
| { |
| |
| static ARMOpcode |
| g_thumb_opcodes[] = |
| { |
| //---------------------------------------------------------------------- |
| // Prologue instructions |
| //---------------------------------------------------------------------- |
| |
| // push register(s) |
| { 0xfffffe00, 0x0000b400, ARMvAll, eEncodingT1, eSize16, &EmulateInstructionARM::EmulatePUSH, "push <registers>" }, |
| { 0xffff0000, 0xe92d0000, ARMV6T2_ABOVE, eEncodingT2, eSize32, &EmulateInstructionARM::EmulatePUSH, "push.w <registers>" }, |
| { 0xffff0fff, 0xf84d0d04, ARMV6T2_ABOVE, eEncodingT3, eSize32, &EmulateInstructionARM::EmulatePUSH, "push.w <register>" }, |
| |
| // set r7 to point to a stack offset |
| { 0xffffff00, 0x0000af00, ARMvAll, eEncodingT1, eSize16, &EmulateInstructionARM::EmulateADDRdSPImm, "add r7, sp, #imm" }, |
| // copy the stack pointer to r7 |
| { 0xffffffff, 0x0000466f, ARMvAll, eEncodingT1, eSize16, &EmulateInstructionARM::EmulateMOVRdSP, "mov r7, sp" }, |
| // move from high register to low register (comes after "mov r7, sp" to resolve ambiguity) |
| { 0xffffffc0, 0x00004640, ARMvAll, eEncodingT1, eSize16, &EmulateInstructionARM::EmulateMOVLowHigh, "mov r0-r7, r8-r15" }, |
| |
| // PC-relative load into register (see also EmulateADDSPRm) |
| { 0xfffff800, 0x00004800, ARMvAll, eEncodingT1, eSize16, &EmulateInstructionARM::EmulateLDRRtPCRelative, "ldr <Rt>, [PC, #imm]"}, |
| |
| // adjust the stack pointer |
| { 0xffffff87, 0x00004485, ARMvAll, eEncodingT2, eSize16, &EmulateInstructionARM::EmulateADDSPRm, "add sp, <Rm>"}, |
| { 0xffffff80, 0x0000b080, ARMvAll, eEncodingT1, eSize16, &EmulateInstructionARM::EmulateSUBSPImm, "add sp, sp, #imm"}, |
| { 0xfbef8f00, 0xf1ad0d00, ARMV6T2_ABOVE, eEncodingT2, eSize32, &EmulateInstructionARM::EmulateSUBSPImm, "sub.w sp, sp, #<const>"}, |
| { 0xfbff8f00, 0xf2ad0d00, ARMV6T2_ABOVE, eEncodingT3, eSize32, &EmulateInstructionARM::EmulateSUBSPImm, "subw sp, sp, #imm12"}, |
| |
| // vector push consecutive extension register(s) |
| { 0xffbf0f00, 0xed2d0b00, ARMV6T2_ABOVE, eEncodingT1, eSize32, &EmulateInstructionARM::EmulateVPUSH, "vpush.64 <list>"}, |
| { 0xffbf0f00, 0xed2d0a00, ARMV6T2_ABOVE, eEncodingT2, eSize32, &EmulateInstructionARM::EmulateVPUSH, "vpush.32 <list>"}, |
| |
| //---------------------------------------------------------------------- |
| // Epilogue instructions |
| //---------------------------------------------------------------------- |
| |
| { 0xffffff80, 0x0000b000, ARMvAll, eEncodingT2, eSize16, &EmulateInstructionARM::EmulateADDSPImm, "add sp, #imm"}, |
| { 0xfffffe00, 0x0000bc00, ARMvAll, eEncodingT1, eSize16, &EmulateInstructionARM::EmulatePOP, "pop <registers>"}, |
| { 0xffff0000, 0xe8bd0000, ARMV6T2_ABOVE, eEncodingT2, eSize32, &EmulateInstructionARM::EmulatePOP, "pop.w <registers>" }, |
| { 0xffff0fff, 0xf85d0d04, ARMV6T2_ABOVE, eEncodingT3, eSize32, &EmulateInstructionARM::EmulatePOP, "pop.w <register>" }, |
| { 0xffbf0f00, 0xecbd0b00, ARMV6T2_ABOVE, eEncodingT1, eSize32, &EmulateInstructionARM::EmulateVPOP, "vpop.64 <list>"}, |
| { 0xffbf0f00, 0xecbd0a00, ARMV6T2_ABOVE, eEncodingT2, eSize32, &EmulateInstructionARM::EmulateVPOP, "vpop.32 <list>"}, |
| |
| //---------------------------------------------------------------------- |
| // Supervisor Call (previously Software Interrupt) |
| //---------------------------------------------------------------------- |
| { 0xffffff00, 0x0000df00, ARMvAll, eEncodingT1, eSize16, &EmulateInstructionARM::EmulateSVC, "svc #imm8"}, |
| |
| //---------------------------------------------------------------------- |
| // If Then makes up to four following instructions conditional. |
| //---------------------------------------------------------------------- |
| { 0xffffff00, 0x0000bf00, ARMvAll, eEncodingT1, eSize16, &EmulateInstructionARM::EmulateIT, "it{<x>{<y>{<z>}}} <firstcond>"}, |
| |
| //---------------------------------------------------------------------- |
| // Branch instructions |
| //---------------------------------------------------------------------- |
| // To resolve ambiguity, "b<c> #imm8" should come after "svc #imm8". |
| { 0xfffff000, 0x0000d000, ARMvAll, eEncodingT1, eSize16, &EmulateInstructionARM::EmulateB, "b<c> #imm8 (outside IT)"}, |
| { 0xffff8000, 0x0000e000, ARMvAll, eEncodingT2, eSize16, &EmulateInstructionARM::EmulateB, "b #imm11 (outside or last in IT)"}, |
| { 0xf800d000, 0xf0008000, ARMV6T2_ABOVE, eEncodingT3, eSize32, &EmulateInstructionARM::EmulateB, "b<c>.w #imm8 (outside IT)"}, |
| { 0xf800d000, 0xf0009000, ARMV6T2_ABOVE, eEncodingT4, eSize32, &EmulateInstructionARM::EmulateB, "b.w #imm8 (outside or last in IT)"}, |
| // J1 == J2 == 1 |
| { 0xf800f800, 0xf000f800, ARMV4T_ABOVE, eEncodingT1, eSize32, &EmulateInstructionARM::EmulateBLXImmediate, "bl <label>"}, |
| // J1 == J2 == 1 |
| { 0xf800e800, 0xf000e800, ARMV5_ABOVE, eEncodingT2, eSize32, &EmulateInstructionARM::EmulateBLXImmediate, "blx <label>"}, |
| { 0xffffff87, 0x00004780, ARMV5_ABOVE, eEncodingT1, eSize16, &EmulateInstructionARM::EmulateBLXRm, "blx <Rm>"}, |
| // for example, "bx lr" |
| { 0xffffff87, 0x00004700, ARMvAll, eEncodingA1, eSize32, &EmulateInstructionARM::EmulateBXRm, "bx <Rm>"}, |
| // compare and branch |
| { 0xfffff500, 0x0000b100, ARMV6T2_ABOVE, eEncodingT1, eSize16, &EmulateInstructionARM::EmulateCB, "cb{n}z <Rn>, <label>"}, |
| // table branch byte |
| { 0xfff0fff0, 0xe8d0f000, ARMV6T2_ABOVE, eEncodingT1, eSize32, &EmulateInstructionARM::EmulateTB, "tbb<c> <Rn>, <Rm>"}, |
| // table branch halfword |
| { 0xfff0fff0, 0xe8d0f010, ARMV6T2_ABOVE, eEncodingT1, eSize32, &EmulateInstructionARM::EmulateTB, "tbh<c> <Rn>, <Rm>, lsl #1"}, |
| |
| //---------------------------------------------------------------------- |
| // Data-processing instructions |
| //---------------------------------------------------------------------- |
| // adc (immediate) |
| { 0xfbe08000, 0xf1400000, ARMV6T2_ABOVE, eEncodingT1, eSize32, &EmulateInstructionARM::EmulateADCImm, "adc{s}<c> <Rd>, <Rn>, #<const>"}, |
| // adc (register) |
| { 0xffffffc0, 0x00004140, ARMvAll, eEncodingT1, eSize16, &EmulateInstructionARM::EmulateADCReg, "adcs|adc<c> <Rdn>, <Rm>"}, |
| { 0xffe08000, 0xeb400000, ARMV6T2_ABOVE, eEncodingT2, eSize32, &EmulateInstructionARM::EmulateADCReg, "adc{s}<c>.w <Rd>, <Rn>, <Rm> {,<shift>}"}, |
| // add (register) |
| { 0xfffffe00, 0x00001800, ARMvAll, eEncodingT1, eSize16, &EmulateInstructionARM::EmulateADDReg, "adds|add<c> <Rd>, <Rn>, <Rm>"}, |
| // Make sure "add sp, <Rm>" comes before this instruction, so there's no ambiguity decoding the two. |
| { 0xffffff00, 0x00004400, ARMvAll, eEncodingT2, eSize16, &EmulateInstructionARM::EmulateADDReg, "add<c> <Rdn>, <Rm>"}, |
| // and (immediate) |
| { 0xfbe08000, 0xf0000000, ARMV6T2_ABOVE, eEncodingT1, eSize32, &EmulateInstructionARM::EmulateANDImm, "and{s}<c> <Rd>, <Rn>, #<const>"}, |
| // and (register) |
| { 0xffffffc0, 0x00004000, ARMvAll, eEncodingT1, eSize16, &EmulateInstructionARM::EmulateANDReg, "ands|and<c> <Rdn>, <Rm>"}, |
| { 0xffe08000, 0xea000000, ARMV6T2_ABOVE, eEncodingT2, eSize32, &EmulateInstructionARM::EmulateANDReg, "and{s}<c>.w <Rd>, <Rn>, <Rm> {,<shift>}"}, |
| // eor (immediate) |
| { 0xfbe08000, 0xf0800000, ARMV6T2_ABOVE, eEncodingT1, eSize32, &EmulateInstructionARM::EmulateEORImm, "eor{s}<c> <Rd>, <Rn>, #<const>"}, |
| // eor (register) |
| { 0xffffffc0, 0x00004040, ARMvAll, eEncodingT1, eSize16, &EmulateInstructionARM::EmulateEORReg, "eors|eor<c> <Rdn>, <Rm>"}, |
| { 0xffe08000, 0xea800000, ARMV6T2_ABOVE, eEncodingT2, eSize32, &EmulateInstructionARM::EmulateEORReg, "eor{s}<c>.w <Rd>, <Rn>, <Rm> {,<shift>}"}, |
| // orr (immediate) |
| { 0xfbe08000, 0xf0400000, ARMV6T2_ABOVE, eEncodingT1, eSize32, &EmulateInstructionARM::EmulateORRImm, "orr{s}<c> <Rd>, <Rn>, #<const>"}, |
| // orr (register) |
| { 0xffffffc0, 0x00004300, ARMvAll, eEncodingT1, eSize16, &EmulateInstructionARM::EmulateORRReg, "orrs|orr<c> <Rdn>, <Rm>"}, |
| { 0xffe08000, 0xea400000, ARMV6T2_ABOVE, eEncodingT2, eSize32, &EmulateInstructionARM::EmulateORRReg, "orr{s}<c>.w <Rd>, <Rn>, <Rm> {,<shift>}"}, |
| // rsb (immediate) |
| { 0xffffffc0, 0x00004240, ARMvAll, eEncodingT1, eSize16, &EmulateInstructionARM::EmulateRSBImm, "rsbs|rsb<c> <Rd>, <Rn>, #0"}, |
| { 0xfbe08000, 0xf1c00000, ARMV6T2_ABOVE, eEncodingT2, eSize32, &EmulateInstructionARM::EmulateRSBImm, "rsb{s}<c>.w <Rd>, <Rn>, #<const>"}, |
| // rsb (register) |
| { 0xffe08000, 0xea400000, ARMV6T2_ABOVE, eEncodingT1, eSize32, &EmulateInstructionARM::EmulateRSBReg, "rsb{s}<c>.w <Rd>, <Rn>, <Rm> {,<shift>}"}, |
| // teq (immediate) |
| { 0xfbf08f00, 0xf0900f00, ARMV6T2_ABOVE, eEncodingT1, eSize32, &EmulateInstructionARM::EmulateTEQImm, "teq<c> <Rn>, #<const>"}, |
| // teq (register) |
| { 0xfff08f00, 0xea900f00, ARMV6T2_ABOVE, eEncodingT1, eSize32, &EmulateInstructionARM::EmulateTEQReg, "teq<c> <Rn>, <Rm> {,<shift>}"}, |
| // tst (immediate) |
| { 0xfbf08f00, 0xf0100f00, ARMV6T2_ABOVE, eEncodingT1, eSize32, &EmulateInstructionARM::EmulateTSTImm, "tst<c> <Rn>, #<const>"}, |
| // tst (register) |
| { 0xffffffc0, 0x00004200, ARMvAll, eEncodingT1, eSize16, &EmulateInstructionARM::EmulateTSTReg, "tst<c> <Rdn>, <Rm>"}, |
| { 0xfff08f00, 0xea100f00, ARMV6T2_ABOVE, eEncodingT2, eSize32, &EmulateInstructionARM::EmulateTSTReg, "tst<c>.w <Rn>, <Rm> {,<shift>}"}, |
| |
| |
| // move from high register to high register |
| { 0xffffff00, 0x00004600, ARMvAll, eEncodingT1, eSize16, &EmulateInstructionARM::EmulateMOVRdRm, "mov<c> <Rd>, <Rm>"}, |
| // move from low register to low register |
| { 0xffffffc0, 0x00000000, ARMvAll, eEncodingT2, eSize16, &EmulateInstructionARM::EmulateMOVRdRm, "movs <Rd>, <Rm>"}, |
| // mov{s}<c>.w <Rd>, <Rm> |
| { 0xffeff0f0, 0xea4f0000, ARMV6T2_ABOVE, eEncodingT3, eSize32, &EmulateInstructionARM::EmulateMOVRdRm, "mov{s}<c>.w <Rd>, <Rm>"}, |
| // move immediate |
| { 0xfffff800, 0x00002000, ARMvAll, eEncodingT1, eSize16, &EmulateInstructionARM::EmulateMOVRdImm, "movs|mov<c> <Rd>, #imm8"}, |
| { 0xfbef8000, 0xf04f0000, ARMV6T2_ABOVE, eEncodingT2, eSize32, &EmulateInstructionARM::EmulateMOVRdImm, "mov{s}<c>.w <Rd>, #<const>"}, |
| // mvn (immediate) |
| { 0xfbef8000, 0xf06f0000, ARMV6T2_ABOVE, eEncodingT1, eSize32, &EmulateInstructionARM::EmulateMVNImm, "mvn{s} <Rd>, #<const>"}, |
| // mvn (register) |
| { 0xffffffc0, 0x000043c0, ARMvAll, eEncodingT1, eSize16, &EmulateInstructionARM::EmulateMVNReg, "mvns|mvn<c> <Rd>, <Rm>"}, |
| { 0xffef8000, 0xea6f0000, ARMV6T2_ABOVE, eEncodingT2, eSize32, &EmulateInstructionARM::EmulateMVNReg, "mvn{s}<c>.w <Rd>, <Rm> {,<shift>}"}, |
| // cmn (immediate) |
| { 0xfbf08f00, 0xf1100f00, ARMV6T2_ABOVE, eEncodingT1, eSize32, &EmulateInstructionARM::EmulateCMNImm, "cmn<c> <Rn>, #<const>"}, |
| // cmn (register) |
| { 0xffffffc0, 0x000042c0, ARMvAll, eEncodingT1, eSize16, &EmulateInstructionARM::EmulateCMNReg, "cmn<c> <Rn>, <Rm>"}, |
| { 0xfff08f00, 0xeb100f00, ARMV6T2_ABOVE, eEncodingT2, eSize32, &EmulateInstructionARM::EmulateCMNReg, "cmn<c> <Rn>, <Rm> {,<shift>}"}, |
| // cmp (immediate) |
| { 0xfffff800, 0x00002800, ARMvAll, eEncodingT1, eSize16, &EmulateInstructionARM::EmulateCMPImm, "cmp<c> <Rn>, #imm8"}, |
| { 0xfbf08f00, 0xf1b00f00, ARMV6T2_ABOVE, eEncodingT2, eSize32, &EmulateInstructionARM::EmulateCMPImm, "cmp<c>.w <Rn>, #<const>"}, |
| // cmp (register) (Rn and Rm both from r0-r7) |
| { 0xffffffc0, 0x00004280, ARMvAll, eEncodingT1, eSize16, &EmulateInstructionARM::EmulateCMPReg, "cmp<c> <Rn>, <Rm>"}, |
| // cmp (register) (Rn and Rm not both from r0-r7) |
| { 0xffffff00, 0x00004500, ARMvAll, eEncodingT2, eSize16, &EmulateInstructionARM::EmulateCMPReg, "cmp<c> <Rn>, <Rm>"}, |
| // asr (immediate) |
| { 0xfffff800, 0x00001000, ARMvAll, eEncodingT1, eSize16, &EmulateInstructionARM::EmulateASRImm, "asrs|asr<c> <Rd>, <Rm>, #imm"}, |
| { 0xffef8030, 0xea4f0020, ARMV6T2_ABOVE, eEncodingT2, eSize32, &EmulateInstructionARM::EmulateASRImm, "asr{s}<c>.w <Rd>, <Rm>, #imm"}, |
| // asr (register) |
| { 0xffffffc0, 0x00004100, ARMvAll, eEncodingT1, eSize16, &EmulateInstructionARM::EmulateASRReg, "asrs|asr<c> <Rdn>, <Rm>"}, |
| { 0xffe0f0f0, 0xfa40f000, ARMV6T2_ABOVE, eEncodingT2, eSize32, &EmulateInstructionARM::EmulateASRReg, "asr{s}<c>.w <Rd>, <Rn>, <Rm>"}, |
| // lsl (immediate) |
| { 0xfffff800, 0x00000000, ARMvAll, eEncodingT1, eSize16, &EmulateInstructionARM::EmulateLSLImm, "lsls|lsl<c> <Rd>, <Rm>, #imm"}, |
| { 0xffef8030, 0xea4f0000, ARMV6T2_ABOVE, eEncodingT2, eSize32, &EmulateInstructionARM::EmulateLSLImm, "lsl{s}<c>.w <Rd>, <Rm>, #imm"}, |
| // lsl (register) |
| { 0xffffffc0, 0x00004080, ARMvAll, eEncodingT1, eSize16, &EmulateInstructionARM::EmulateLSLReg, "lsls|lsl<c> <Rdn>, <Rm>"}, |
| { 0xffe0f0f0, 0xfa00f000, ARMV6T2_ABOVE, eEncodingT2, eSize32, &EmulateInstructionARM::EmulateLSLReg, "lsl{s}<c>.w <Rd>, <Rn>, <Rm>"}, |
| // lsr (immediate) |
| { 0xfffff800, 0x00000800, ARMvAll, eEncodingT1, eSize16, &EmulateInstructionARM::EmulateLSRImm, "lsrs|lsr<c> <Rd>, <Rm>, #imm"}, |
| { 0xffef8030, 0xea4f0010, ARMV6T2_ABOVE, eEncodingT2, eSize32, &EmulateInstructionARM::EmulateLSRImm, "lsr{s}<c>.w <Rd>, <Rm>, #imm"}, |
| // lsr (register) |
| { 0xffffffc0, 0x000040c0, ARMvAll, eEncodingT1, eSize16, &EmulateInstructionARM::EmulateLSRReg, "lsrs|lsr<c> <Rdn>, <Rm>"}, |
| { 0xffe0f0f0, 0xfa20f000, ARMV6T2_ABOVE, eEncodingT2, eSize32, &EmulateInstructionARM::EmulateLSRReg, "lsr{s}<c>.w <Rd>, <Rn>, <Rm>"}, |
| // rrx is a special case encoding of ror (immediate) |
| { 0xffeff0f0, 0xea4f0030, ARMV6T2_ABOVE, eEncodingT1, eSize32, &EmulateInstructionARM::EmulateRRX, "rrx{s}<c>.w <Rd>, <Rm>"}, |
| // ror (immediate) |
| { 0xffef8030, 0xea4f0030, ARMV6T2_ABOVE, eEncodingT1, eSize32, &EmulateInstructionARM::EmulateRORImm, "ror{s}<c>.w <Rd>, <Rm>, #imm"}, |
| // ror (register) |
| { 0xffffffc0, 0x000041c0, ARMvAll, eEncodingT1, eSize16, &EmulateInstructionARM::EmulateRORReg, "rors|ror<c> <Rdn>, <Rm>"}, |
| { 0xffe0f0f0, 0xfa60f000, ARMV6T2_ABOVE, eEncodingT2, eSize32, &EmulateInstructionARM::EmulateRORReg, "ror{s}<c>.w <Rd>, <Rn>, <Rm>"}, |
| |
| //---------------------------------------------------------------------- |
| // Load instructions |
| //---------------------------------------------------------------------- |
| { 0xfffff800, 0x0000c800, ARMV4T_ABOVE, eEncodingT1, eSize16, &EmulateInstructionARM::EmulateLDM, "ldm<c> <Rn>{!} <registers>" }, |
| { 0xffd02000, 0xe8900000, ARMV6T2_ABOVE, eEncodingT2, eSize32, &EmulateInstructionARM::EmulateLDM, "ldm<c>.w <Rn>{!} <registers>" }, |
| { 0xffd00000, 0xe9100000, ARMV6T2_ABOVE, eEncodingT1, eSize32, &EmulateInstructionARM::EmulateLDMDB, "ldmdb<c> <Rn>{!} <registers>" }, |
| { 0xfffff800, 0x00006800, ARMvAll, eEncodingT1, eSize16, &EmulateInstructionARM::EmulateLDRRtRnImm, "ldr<c> <Rt>, [<Rn>{,#imm}]"}, |
| // Thumb2 PC-relative load into register |
| { 0xff7f0000, 0xf85f0000, ARMV6T2_ABOVE, eEncodingT2, eSize32, &EmulateInstructionARM::EmulateLDRRtPCRelative, "ldr<c>.w <Rt>, [PC, +/-#imm}]"}, |
| { 0xfffffe00, 0x00005800, ARMV4T_ABOVE, eEncodingT1, eSize16, &EmulateInstructionARM::EmulateLDRRegister, "ldr<c> <Rt>, [<Rn>, <Rm>]" }, |
| { 0xfff00fc0, 0xf8500000, ARMV6T2_ABOVE, eEncodingT2, eSize32, &EmulateInstructionARM::EmulateLDRRegister, "ldr<c>.w <Rt>, [<Rn>,<Rm>{,LSL #<imm2>}]" }, |
| { 0xfffff800, 0x00007800, ARMV4T_ABOVE, eEncodingT1, eSize16, &EmulateInstructionARM::EmulateLDRBImmediate, "ldrb<c> <Rt>,[<Rn>{,#<imm5>}]" }, |
| { 0xfff00000, 0xf8900000, ARMV6T2_ABOVE, eEncodingT2, eSize32, &EmulateInstructionARM::EmulateLDRBImmediate, "ldrb<c>.w <Rt>,[<Rn>{,#<imm12>}]" }, |
| { 0xfff00800, 0xf8100800, ARMV6T2_ABOVE, eEncodingT3, eSize32, &EmulateInstructionARM::EmulateLDRBImmediate, "ldrb<c> <Rt>,[>Rn>, #+/-<imm8>]{!}" }, |
| { 0xff7f0000, 0xf81f0000, ARMV6T2_ABOVE, eEncodingT1, eSize32, &EmulateInstructionARM::EmulateLDRBLiteral, "ldrb<c> <Rt>,[...]" }, |
| { 0xfffffe00, 0x00005c00, ARMV6T2_ABOVE, eEncodingT1, eSize16, &EmulateInstructionARM::EmulateLDRBRegister, "ldrb<c> <Rt>,[<Rn>,<Rm>]" }, |
| { 0xfff00fc0, 0xf8100000, ARMV6T2_ABOVE, eEncodingT2, eSize32,&EmulateInstructionARM::EmulateLDRBRegister, "ldrb<c>.w <Rt>,[<Rn>,<Rm>{,LSL #imm2>}]" }, |
| |
| //---------------------------------------------------------------------- |
| // Store instructions |
| //---------------------------------------------------------------------- |
| { 0xfffff800, 0x0000c000, ARMV4T_ABOVE, eEncodingT1, eSize16, &EmulateInstructionARM::EmulateSTM, "stm<c> <Rn>{!} <registers>" }, |
| { 0xffd00000, 0xe8800000, ARMV6T2_ABOVE, eEncodingT2, eSize32, &EmulateInstructionARM::EmulateSTM, "stm<c>.w <Rn>{!} <registers>" }, |
| { 0xffd00000, 0xe9000000, ARMV6T2_ABOVE, eEncodingT1, eSize32, &EmulateInstructionARM::EmulateSTMDB, "stmdb<c> <Rn>{!} <registers>" }, |
| { 0xfffff800, 0x00006000, ARMV4T_ABOVE, eEncodingT1, eSize16, &EmulateInstructionARM::EmulateSTRThumb, "str<c> <Rt>, [<Rn>{,#<imm>}]" }, |
| { 0xfffff800, 0x00009000, ARMV4T_ABOVE, eEncodingT2, eSize16, &EmulateInstructionARM::EmulateSTRThumb, "str<c> <Rt>, [SP,#<imm>]" }, |
| { 0xfff00000, 0xf8c00000, ARMV6T2_ABOVE, eEncodingT3, eSize32, &EmulateInstructionARM::EmulateSTRThumb, "str<c>.w <Rt>, [<Rn>,#<imm12>]" }, |
| { 0xfff00800, 0xf8400800, ARMV6T2_ABOVE, eEncodingT4, eSize32, &EmulateInstructionARM::EmulateSTRThumb, "str<c> <Rt>, [<Rn>,#+/-<imm8>]" }, |
| { 0xfffffe00, 0x00005000, ARMV4T_ABOVE, eEncodingT1, eSize16, &EmulateInstructionARM::EmulateSTRRegister, "str<c> <Rt> ,{<Rn>, <Rm>]" }, |
| { 0xfff00fc0, 0xf8400000, ARMV6T2_ABOVE, eEncodingT2, eSize32, &EmulateInstructionARM::EmulateSTRRegister, "str<c>.w <Rt>, [<Rn>, <Rm> {lsl #imm2>}]" }, |
| { 0xfffff800, 0x00007000, ARMV4T_ABOVE, eEncodingT1, eSize16, &EmulateInstructionARM::EmulateSTRBThumb, "strb<c> <Rt>, [<Rn>, #<imm5>]" }, |
| { 0xfff00000, 0xf8800000, ARMV6T2_ABOVE, eEncodingT2, eSize32, &EmulateInstructionARM::EmulateSTRBThumb, "strb<c>.w <Rt>, [<Rn>, #<imm12>]" }, |
| { 0xfff00800, 0xf8000800, ARMV6T2_ABOVE, eEncodingT3, eSize32, &EmulateInstructionARM::EmulateSTRBThumb, "strb<c> <Rt> ,[<Rn>, #+/-<imm8>]{!}" } |
| }; |
| |
| const size_t k_num_thumb_opcodes = sizeof(g_thumb_opcodes)/sizeof(ARMOpcode); |
| for (size_t i=0; i<k_num_thumb_opcodes; ++i) |
| { |
| if ((g_thumb_opcodes[i].mask & opcode) == g_thumb_opcodes[i].value) |
| return &g_thumb_opcodes[i]; |
| } |
| return NULL; |
| } |
| |
| bool |
| EmulateInstructionARM::SetArchitecture (const ArchSpec &arch) |
| { |
| m_arm_isa = 0; |
| const char *arch_cstr = arch.AsCString (); |
| if (arch_cstr) |
| { |
| if (0 == ::strcasecmp(arch_cstr, "armv4t")) m_arm_isa = ARMv4T; |
| else if (0 == ::strcasecmp(arch_cstr, "armv4")) m_arm_isa = ARMv4; |
| else if (0 == ::strcasecmp(arch_cstr, "armv5tej")) m_arm_isa = ARMv5TEJ; |
| else if (0 == ::strcasecmp(arch_cstr, "armv5te")) m_arm_isa = ARMv5TE; |
| else if (0 == ::strcasecmp(arch_cstr, "armv5t")) m_arm_isa = ARMv5T; |
| else if (0 == ::strcasecmp(arch_cstr, "armv6k")) m_arm_isa = ARMv6K; |
| else if (0 == ::strcasecmp(arch_cstr, "armv6")) m_arm_isa = ARMv6; |
| else if (0 == ::strcasecmp(arch_cstr, "armv6t2")) m_arm_isa = ARMv6T2; |
| else if (0 == ::strcasecmp(arch_cstr, "armv7")) m_arm_isa = ARMv7; |
| else if (0 == ::strcasecmp(arch_cstr, "armv8")) m_arm_isa = ARMv8; |
| } |
| return m_arm_isa != 0; |
| } |
| |
| |
| bool |
| EmulateInstructionARM::ReadInstruction () |
| { |
| bool success = false; |
| m_inst_cpsr = ReadRegisterUnsigned (eRegisterKindGeneric, LLDB_REGNUM_GENERIC_FLAGS, 0, &success); |
| if (success) |
| { |
| addr_t pc = ReadRegisterUnsigned (eRegisterKindGeneric, LLDB_REGNUM_GENERIC_PC, LLDB_INVALID_ADDRESS, &success); |
| if (success) |
| { |
| Context read_inst_context; |
| read_inst_context.type = eContextReadOpcode; |
| read_inst_context.SetNoArgs (); |
| |
| if (m_inst_cpsr & MASK_CPSR_T) |
| { |
| m_inst_mode = eModeThumb; |
| uint32_t thumb_opcode = MemARead(read_inst_context, pc, 2, 0, &success); |
| |
| if (success) |
| { |
| if ((m_inst.opcode.inst16 & 0xe000) != 0xe000 || ((m_inst.opcode.inst16 & 0x1800u) == 0)) |
| { |
| m_inst.opcode_type = eOpcode16; |
| m_inst.opcode.inst16 = thumb_opcode; |
| } |
| else |
| { |
| m_inst.opcode_type = eOpcode32; |
| m_inst.opcode.inst32 = (thumb_opcode << 16) | MemARead(read_inst_context, pc + 2, 2, 0, &success); |
| } |
| } |
| } |
| else |
| { |
| m_inst_mode = eModeARM; |
| m_inst.opcode_type = eOpcode32; |
| m_inst.opcode.inst32 = MemARead(read_inst_context, pc, 4, 0, &success); |
| } |
| } |
| } |
| if (!success) |
| { |
| m_inst_mode = eModeInvalid; |
| m_inst_pc = LLDB_INVALID_ADDRESS; |
| } |
| return success; |
| } |
| |
| uint32_t |
| EmulateInstructionARM::ArchVersion () |
| { |
| return m_arm_isa; |
| } |
| |
| bool |
| EmulateInstructionARM::ConditionPassed () |
| { |
| if (m_inst_cpsr == 0) |
| return false; |
| |
| const uint32_t cond = CurrentCond (); |
| |
| if (cond == UINT32_MAX) |
| return false; |
| |
| bool result = false; |
| switch (UnsignedBits(cond, 3, 1)) |
| { |
| case 0: result = (m_inst_cpsr & MASK_CPSR_Z) != 0; break; |
| case 1: result = (m_inst_cpsr & MASK_CPSR_C) != 0; break; |
| case 2: result = (m_inst_cpsr & MASK_CPSR_N) != 0; break; |
| case 3: result = (m_inst_cpsr & MASK_CPSR_V) != 0; break; |
| case 4: result = ((m_inst_cpsr & MASK_CPSR_C) != 0) && ((m_inst_cpsr & MASK_CPSR_Z) == 0); break; |
| case 5: |
| { |
| bool n = (m_inst_cpsr & MASK_CPSR_N); |
| bool v = (m_inst_cpsr & MASK_CPSR_V); |
| result = n == v; |
| } |
| break; |
| case 6: |
| { |
| bool n = (m_inst_cpsr & MASK_CPSR_N); |
| bool v = (m_inst_cpsr & MASK_CPSR_V); |
| result = n == v && ((m_inst_cpsr & MASK_CPSR_Z) == 0); |
| } |
| break; |
| case 7: |
| result = true; |
| break; |
| } |
| |
| if (cond & 1) |
| result = !result; |
| return result; |
| } |
| |
| uint32_t |
| EmulateInstructionARM::CurrentCond () |
| { |
| switch (m_inst_mode) |
| { |
| default: |
| case eModeInvalid: |
| break; |
| |
| case eModeARM: |
| return UnsignedBits(m_inst.opcode.inst32, 31, 28); |
| |
| case eModeThumb: |
| // For T1 and T3 encodings of the Branch instruction, it returns the 4-bit |
| // 'cond' field of the encoding. |
| if (m_inst.opcode_type == eOpcode16 && |
| Bits32(m_inst.opcode.inst16, 15, 12) == 0x0d && |
| Bits32(m_inst.opcode.inst16, 11, 7) != 0x0f) |
| { |
| return Bits32(m_inst.opcode.inst16, 11, 7); |
| } |
| else if (m_inst.opcode_type == eOpcode32 && |
| Bits32(m_inst.opcode.inst32, 31, 27) == 0x1e && |
| Bits32(m_inst.opcode.inst32, 15, 14) == 0x02 && |
| Bits32(m_inst.opcode.inst32, 12, 12) == 0x00 && |
| Bits32(m_inst.opcode.inst32, 25, 22) <= 0x0d) |
| { |
| return Bits32(m_inst.opcode.inst32, 25, 22); |
| } |
| |
| return m_it_session.GetCond(); |
| } |
| return UINT32_MAX; // Return invalid value |
| } |
| |
| bool |
| EmulateInstructionARM::InITBlock() |
| { |
| return CurrentInstrSet() == eModeThumb && m_it_session.InITBlock(); |
| } |
| |
| bool |
| EmulateInstructionARM::LastInITBlock() |
| { |
| return CurrentInstrSet() == eModeThumb && m_it_session.LastInITBlock(); |
| } |
| |
| bool |
| EmulateInstructionARM::BranchWritePC (const Context &context, uint32_t addr) |
| { |
| addr_t target; |
| |
| // Check the current instruction set. |
| if (CurrentInstrSet() == eModeARM) |
| target = addr & 0xfffffffc; |
| else |
| target = addr & 0xfffffffe; |
| |
| if (!WriteRegisterUnsigned (context, eRegisterKindGeneric, LLDB_REGNUM_GENERIC_PC, target)) |
| return false; |
| |
| return true; |
| } |
| |
| // As a side effect, BXWritePC sets context.arg2 to eModeARM or eModeThumb by inspecting addr. |
| bool |
| EmulateInstructionARM::BXWritePC (Context &context, uint32_t addr) |
| { |
| addr_t target; |
| // If the CPSR is changed due to switching between ARM and Thumb ISETSTATE, |
| // we want to record it and issue a WriteRegister callback so the clients |
| // can track the mode changes accordingly. |
| bool cpsr_changed = false; |
| |
| if (BitIsSet(addr, 0)) |
| { |
| if (CurrentInstrSet() != eModeThumb) |
| { |
| SelectInstrSet(eModeThumb); |
| cpsr_changed = true; |
| } |
| target = addr & 0xfffffffe; |
| context.SetMode (eModeThumb); |
| } |
| else if (BitIsClear(addr, 1)) |
| { |
| if (CurrentInstrSet() != eModeARM) |
| { |
| SelectInstrSet(eModeARM); |
| cpsr_changed = true; |
| } |
| target = addr & 0xfffffffc; |
| context.SetMode (eModeARM); |
| } |
| else |
| return false; // address<1:0> == '10' => UNPREDICTABLE |
| |
| if (cpsr_changed) |
| { |
| if (!WriteRegisterUnsigned (context, eRegisterKindGeneric, LLDB_REGNUM_GENERIC_FLAGS, m_new_inst_cpsr)) |
| return false; |
| } |
| if (!WriteRegisterUnsigned (context, eRegisterKindGeneric, LLDB_REGNUM_GENERIC_PC, target)) |
| return false; |
| |
| return true; |
| } |
| |
| // Dispatches to either BXWritePC or BranchWritePC based on architecture versions. |
| bool |
| EmulateInstructionARM::LoadWritePC (Context &context, uint32_t addr) |
| { |
| if (ArchVersion() >= ARMv5T) |
| return BXWritePC(context, addr); |
| else |
| return BranchWritePC((const Context)context, addr); |
| } |
| |
| // Dispatches to either BXWritePC or BranchWritePC based on architecture versions and current instruction set. |
| bool |
| EmulateInstructionARM::ALUWritePC (Context &context, uint32_t addr) |
| { |
| if (ArchVersion() >= ARMv7 && CurrentInstrSet() == eModeARM) |
| return BXWritePC(context, addr); |
| else |
| return BranchWritePC((const Context)context, addr); |
| } |
| |
| EmulateInstructionARM::Mode |
| EmulateInstructionARM::CurrentInstrSet () |
| { |
| return m_inst_mode; |
| } |
| |
| // Set the 'T' bit of our CPSR. The m_inst_mode gets updated when the next |
| // ReadInstruction() is performed. This function has a side effect of updating |
| // the m_new_inst_cpsr member variable if necessary. |
| bool |
| EmulateInstructionARM::SelectInstrSet (Mode arm_or_thumb) |
| { |
| m_new_inst_cpsr = m_inst_cpsr; |
| switch (arm_or_thumb) |
| { |
| default: |
| return false; |
| eModeARM: |
| // Clear the T bit. |
| m_new_inst_cpsr &= ~MASK_CPSR_T; |
| break; |
| eModeThumb: |
| // Set the T bit. |
| m_new_inst_cpsr |= MASK_CPSR_T; |
| break; |
| } |
| return true; |
| } |
| |
| // This function returns TRUE if the processor currently provides support for |
| // unaligned memory accesses, or FALSE otherwise. This is always TRUE in ARMv7, |
| // controllable by the SCTLR.U bit in ARMv6, and always FALSE before ARMv6. |
| bool |
| EmulateInstructionARM::UnalignedSupport() |
| { |
| return (ArchVersion() >= ARMv7); |
| } |
| |
| // The main addition and subtraction instructions can produce status information |
| // about both unsigned carry and signed overflow conditions. This status |
| // information can be used to synthesize multi-word additions and subtractions. |
| EmulateInstructionARM::AddWithCarryResult |
| EmulateInstructionARM::AddWithCarry (uint32_t x, uint32_t y, uint8_t carry_in) |
| { |
| uint32_t result; |
| uint8_t carry_out; |
| uint8_t overflow; |
| |
| uint64_t unsigned_sum = x + y + carry_in; |
| int64_t signed_sum = (int32_t)x + (int32_t)y + (int32_t)carry_in; |
| |
| result = UnsignedBits(unsigned_sum, 31, 0); |
| carry_out = (result == unsigned_sum ? 0 : 1); |
| overflow = ((int32_t)result == signed_sum ? 0 : 1); |
| |
| AddWithCarryResult res = { result, carry_out, overflow }; |
| return res; |
| } |
| |
| uint32_t |
| EmulateInstructionARM::ReadCoreReg(uint32_t num, bool *success) |
| { |
| uint32_t reg_kind, reg_num; |
| switch (num) |
| { |
| case SP_REG: |
| reg_kind = eRegisterKindGeneric; |
| reg_num = LLDB_REGNUM_GENERIC_SP; |
| break; |
| case LR_REG: |
| reg_kind = eRegisterKindGeneric; |
| reg_num = LLDB_REGNUM_GENERIC_RA; |
| break; |
| case PC_REG: |
| reg_kind = eRegisterKindGeneric; |
| reg_num = LLDB_REGNUM_GENERIC_PC; |
| break; |
| default: |
| if (0 <= num && num < SP_REG) |
| { |
| reg_kind = eRegisterKindDWARF; |
| reg_num = dwarf_r0 + num; |
| } |
| else |
| { |
| assert(0 && "Invalid register number"); |
| *success = false; |
| return ~0u; |
| } |
| break; |
| } |
| |
| // Read our register. |
| uint32_t val = ReadRegisterUnsigned (reg_kind, reg_num, 0, success); |
| |
| // When executing an ARM instruction , PC reads as the address of the current |
| // instruction plus 8. |
| // When executing a Thumb instruction , PC reads as the address of the current |
| // instruction plus 4. |
| if (num == 15) |
| { |
| if (CurrentInstrSet() == eModeARM) |
| val += 8; |
| else |
| val += 4; |
| } |
| |
| return val; |
| } |
| |
| // Write the result to the ARM core register Rd, and optionally update the |
| // condition flags based on the result. |
| // |
| // This helper method tries to encapsulate the following pseudocode from the |
| // ARM Architecture Reference Manual: |
| // |
| // if d == 15 then // Can only occur for encoding A1 |
| // ALUWritePC(result); // setflags is always FALSE here |
| // else |
| // R[d] = result; |
| // if setflags then |
| // APSR.N = result<31>; |
| // APSR.Z = IsZeroBit(result); |
| // APSR.C = carry; |
| // // APSR.V unchanged |
| // |
| // In the above case, the API client does not pass in the overflow arg, which |
| // defaults to ~0u. |
| bool |
| EmulateInstructionARM::WriteCoreRegOptionalFlags (Context &context, |
| const uint32_t result, |
| const uint32_t Rd, |
| bool setflags, |
| const uint32_t carry, |
| const uint32_t overflow) |
| { |
| if (Rd == 15) |
| { |
| if (!ALUWritePC (context, result)) |
| return false; |
| } |
| else |
| { |
| if (!WriteRegisterUnsigned (context, eRegisterKindDWARF, dwarf_r0 + Rd, result)) |
| return false; |
| if (setflags) |
| return WriteFlags (context, result, carry, overflow); |
| } |
| return true; |
| } |
| |
| // This helper method tries to encapsulate the following pseudocode from the |
| // ARM Architecture Reference Manual: |
| // |
| // APSR.N = result<31>; |
| // APSR.Z = IsZeroBit(result); |
| // APSR.C = carry; |
| // APSR.V = overflow |
| // |
| // Default arguments can be specified for carry and overflow parameters, which means |
| // not to update the respective flags. |
| bool |
| EmulateInstructionARM::WriteFlags (Context &context, |
| const uint32_t result, |
| const uint32_t carry, |
| const uint32_t overflow) |
| { |
| m_new_inst_cpsr = m_inst_cpsr; |
| SetBit32(m_new_inst_cpsr, CPSR_N, Bit32(result, CPSR_N)); |
| SetBit32(m_new_inst_cpsr, CPSR_Z, result == 0 ? 1 : 0); |
| if (carry != ~0u) |
| SetBit32(m_new_inst_cpsr, CPSR_C, carry); |
| if (overflow != ~0u) |
| SetBit32(m_new_inst_cpsr, CPSR_V, overflow); |
| if (m_new_inst_cpsr != m_inst_cpsr) |
| { |
| if (!WriteRegisterUnsigned (context, eRegisterKindGeneric, LLDB_REGNUM_GENERIC_FLAGS, m_new_inst_cpsr)) |
| return false; |
| } |
| return true; |
| } |
| |
| bool |
| EmulateInstructionARM::EvaluateInstruction () |
| { |
| // Advance the ITSTATE bits to their values for the next instruction. |
| if (m_inst_mode == eModeThumb && m_it_session.InITBlock()) |
| m_it_session.ITAdvance(); |
| |
| return false; |
| } |