Made the EmulateInstruction class into a plug-in interface and moved the
source files around into the places they need to go.
git-svn-id: https://llvm.org/svn/llvm-project/llvdb/trunk@124631 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/source/Plugins/Instruction/ARM/EmulateInstructionARM.cpp b/source/Plugins/Instruction/ARM/EmulateInstructionARM.cpp
new file mode 100644
index 0000000..3022a77
--- /dev/null
+++ b/source/Plugins/Instruction/ARM/EmulateInstructionARM.cpp
@@ -0,0 +1,1245 @@
+//===-- 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 "EmulateInstructionARM.h"
+#include "lldb/Core/ConstString.h"
+
+#include "ARMDefines.h"
+#include "ARMUtils.h"
+#include "ARM_DWARF_Registers.h"
+
+using namespace lldb;
+using namespace lldb_private;
+
+// ARM constants used during decoding
+#define REG_RD 0
+#define LDM_REGLIST 1
+#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)
+
+typedef enum
+{
+ eEncodingA1,
+ eEncodingA2,
+ eEncodingA3,
+ eEncodingA4,
+ eEncodingA5,
+ eEncodingT1,
+ eEncodingT2,
+ eEncodingT3,
+ eEncodingT4,
+ eEncodingT5,
+} ARMEncoding;
+
+typedef enum
+{
+ eSize16,
+ eSize32
+} ARMInstrSize;
+
+// Typedef for the callback function used during the emulation.
+// Pass along (ARMEncoding)encoding as the callback data.
+typedef bool (*EmulateCallback) (EmulateInstructionARM *emulator, ARMEncoding encoding);
+
+typedef struct
+{
+ uint32_t mask;
+ uint32_t value;
+ uint32_t variants;
+ ARMEncoding encoding;
+ ARMInstrSize size;
+ EmulateCallback callback;
+ const char *name;
+} ARMOpcode;
+
+// 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.
+static bool
+emulate_push (EmulateInstructionARM *emulator, 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 = emulator->OpcodeAsUnsigned (&success);
+ if (!success)
+ return false;
+
+ if (emulator->ConditionPassed())
+ {
+ const uint32_t addr_byte_size = emulator->GetAddressByteSize();
+ const addr_t sp = emulator->ReadRegisterUnsigned (eRegisterKindGeneric, LLDB_REGNUM_GENERIC_SP, 0, &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 (Bits32(opcode, 8, 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 = { EmulateInstruction::eContextPushRegisterOnStack, eRegisterKindDWARF, 0, 0 };
+ for (i=0; i<15; ++i)
+ {
+ if (BitIsSet (registers, 1u << i))
+ {
+ context.arg1 = dwarf_r0 + i; // arg1 in the context is the DWARF register number
+ context.arg2 = addr - sp; // arg2 in the context is the stack pointer offset
+ uint32_t reg_value = emulator->ReadRegisterUnsigned(eRegisterKindDWARF, context.arg1, 0, &success);
+ if (!success)
+ return false;
+ if (!emulator->WriteMemoryUnsigned (context, addr, reg_value, addr_byte_size))
+ return false;
+ addr += addr_byte_size;
+ }
+ }
+
+ if (BitIsSet (registers, 1u << 15))
+ {
+ context.arg1 = dwarf_pc; // arg1 in the context is the DWARF register number
+ context.arg2 = addr - sp; // arg2 in the context is the stack pointer offset
+ const uint32_t pc = emulator->ReadRegisterUnsigned(eRegisterKindGeneric, LLDB_REGNUM_GENERIC_PC, 0, &success);
+ if (!success)
+ return false;
+ if (!emulator->WriteMemoryUnsigned (context, addr, pc + 8, addr_byte_size))
+ return false;
+ }
+
+ context.type = EmulateInstruction::eContextAdjustStackPointer;
+ context.arg0 = eRegisterKindGeneric;
+ context.arg1 = LLDB_REGNUM_GENERIC_SP;
+ context.arg2 = -sp_offset;
+
+ if (!emulator->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.
+static bool
+emulate_pop (EmulateInstructionARM *emulator, 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 = emulator->OpcodeAsUnsigned (&success);
+ if (!success)
+ return false;
+
+ if (emulator->ConditionPassed())
+ {
+ const uint32_t addr_byte_size = emulator->GetAddressByteSize();
+ const addr_t sp = emulator->ReadRegisterUnsigned (eRegisterKindGeneric, LLDB_REGNUM_GENERIC_SP, 0, &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 (Bits32(opcode, 8, 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 || (Bits32(opcode, 15, 15) && Bits32(opcode, 14, 14)))
+ return false;
+ break;
+ case eEncodingT3:
+ Rt = Bits32(opcode, 15, 12);
+ // if t == 13 || (t == 15 && InITBlock() && !LastInITBlock()) then UNPREDICTABLE;
+ if (Rt == dwarf_sp)
+ 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 (Bits32(opcode, 13, 13))
+ 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 = { EmulateInstruction::eContextPopRegisterOffStack, eRegisterKindDWARF, 0, 0 };
+ for (i=0; i<15; ++i)
+ {
+ if (BitIsSet (registers, 1u << i))
+ {
+ context.arg1 = dwarf_r0 + i; // arg1 in the context is the DWARF register number
+ context.arg2 = addr - sp; // arg2 in the context is the stack pointer offset
+ data = emulator->ReadMemoryUnsigned(context, addr, 4, 0, &success);
+ if (!success)
+ return false;
+ if (!emulator->WriteRegisterUnsigned(context, eRegisterKindDWARF, context.arg1, data))
+ return false;
+ addr += addr_byte_size;
+ }
+ }
+
+ if (BitIsSet (registers, 1u << 15))
+ {
+ context.arg1 = dwarf_pc; // arg1 in the context is the DWARF register number
+ context.arg2 = addr - sp; // arg2 in the context is the stack pointer offset
+ data = emulator->ReadMemoryUnsigned(context, addr, 4, 0, &success);
+ if (!success)
+ return false;
+ if (!emulator->WriteRegisterUnsigned(context, eRegisterKindGeneric, LLDB_REGNUM_GENERIC_PC, data))
+ return false;
+ addr += addr_byte_size;
+ }
+
+ context.type = EmulateInstruction::eContextAdjustStackPointer;
+ context.arg0 = eRegisterKindGeneric;
+ context.arg1 = LLDB_REGNUM_GENERIC_SP;
+ context.arg2 = sp_offset;
+
+ if (!emulator->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)
+static bool
+emulate_add_rd_sp_imm (EmulateInstructionARM *emulator, 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 = emulator->OpcodeAsUnsigned (&success);
+ if (!success)
+ return false;
+
+ if (emulator->ConditionPassed())
+ {
+ const addr_t sp = emulator->ReadRegisterUnsigned (eRegisterKindGeneric, LLDB_REGNUM_GENERIC_SP, 0, &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 = { EmulateInstruction::eContextRegisterPlusOffset,
+ eRegisterKindGeneric,
+ LLDB_REGNUM_GENERIC_SP,
+ sp_offset };
+
+ if (!emulator->WriteRegisterUnsigned (context, eRegisterKindDWARF, dwarf_r0 + Rd, addr))
+ return false;
+ }
+ return true;
+}
+
+// Set r7 or ip to the current stack pointer.
+// MOV (register)
+static bool
+emulate_mov_rd_sp (EmulateInstructionARM *emulator, 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 = emulator->OpcodeAsUnsigned (&success);
+ //if (!success)
+ // return false;
+
+ if (emulator->ConditionPassed())
+ {
+ const addr_t sp = emulator->ReadRegisterUnsigned (eRegisterKindGeneric, LLDB_REGNUM_GENERIC_SP, 0, &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 = { EmulateInstruction::eContextRegisterPlusOffset,
+ eRegisterKindGeneric,
+ LLDB_REGNUM_GENERIC_SP,
+ 0 };
+
+ if (!emulator->WriteRegisterUnsigned (context, eRegisterKindDWARF, dwarf_r0 + Rd, sp))
+ return false;
+ }
+ return true;
+}
+
+// Move from high register (r8-r15) to low register (r0-r7).
+// MOV (register)
+static bool
+emulate_mov_low_high (EmulateInstructionARM *emulator, 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 = emulator->OpcodeAsUnsigned (&success);
+ if (!success)
+ return false;
+
+ if (emulator->ConditionPassed())
+ {
+ uint32_t Rm; // the source register
+ uint32_t Rd; // the destination register
+ switch (encoding) {
+ case eEncodingT1:
+ Rm = Bits32(opcode, 6, 3);
+ Rd = Bits32(opcode, 2, 1); // bits(7) == 0
+ break;
+ default:
+ return false;
+ }
+ int32_t reg_value = emulator->ReadRegisterUnsigned(eRegisterKindDWARF, dwarf_r0 + Rm, 0, &success);
+ if (!success)
+ return false;
+
+ // The context specifies that Rm is to be moved into Rd.
+ EmulateInstruction::Context context = { EmulateInstruction::eContextRegisterPlusOffset,
+ eRegisterKindDWARF,
+ dwarf_r0 + Rm,
+ 0 };
+
+ if (!emulator->WriteRegisterUnsigned (context, eRegisterKindDWARF, dwarf_r0 + Rd, reg_value))
+ return false;
+ }
+ return true;
+}
+
+// PC relative immediate load into register, possibly followed by ADD (SP plus register).
+// LDR (literal)
+static bool
+emulate_ldr_rd_pc_rel (EmulateInstructionARM *emulator, 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 = emulator->OpcodeAsUnsigned (&success);
+ if (!success)
+ return false;
+
+ if (emulator->ConditionPassed())
+ {
+ const uint32_t pc = emulator->ReadRegisterUnsigned(eRegisterKindGeneric, LLDB_REGNUM_GENERIC_PC, 0, &success);
+ if (!success)
+ return false;
+
+ // PC relative immediate load context
+ EmulateInstruction::Context context = {EmulateInstruction::eContextRegisterPlusOffset,
+ eRegisterKindGeneric,
+ LLDB_REGNUM_GENERIC_PC,
+ 0};
+ uint32_t Rd; // the destination register
+ uint32_t imm32; // immediate offset from the PC
+ addr_t addr; // the PC relative address
+ uint32_t data; // the literal data value from the PC relative load
+ switch (encoding) {
+ case eEncodingT1:
+ Rd = Bits32(opcode, 10, 8);
+ imm32 = Bits32(opcode, 7, 0) << 2; // imm32 = ZeroExtend(imm8:'00', 32);
+ addr = pc + 4 + imm32;
+ context.arg2 = 4 + imm32;
+ break;
+ default:
+ return false;
+ }
+ data = emulator->ReadMemoryUnsigned(context, addr, 4, 0, &success);
+ if (!success)
+ return false;
+ if (!emulator->WriteRegisterUnsigned (context, eRegisterKindDWARF, dwarf_r0 + Rd, data))
+ return false;
+ }
+ return true;
+}
+
+// An add operation to adjust the SP.
+// ADD (SP plus immediate)
+static bool
+emulate_add_sp_imm (EmulateInstructionARM *emulator, 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 = emulator->OpcodeAsUnsigned (&success);
+ if (!success)
+ return false;
+
+ if (emulator->ConditionPassed())
+ {
+ const addr_t sp = emulator->ReadRegisterUnsigned (eRegisterKindGeneric, LLDB_REGNUM_GENERIC_SP, 0, &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 = { EmulateInstruction::eContextAdjustStackPointer,
+ eRegisterKindGeneric,
+ LLDB_REGNUM_GENERIC_SP,
+ sp_offset };
+
+ if (!emulator->WriteRegisterUnsigned (context, eRegisterKindGeneric, LLDB_REGNUM_GENERIC_SP, addr))
+ return false;
+ }
+ return true;
+}
+
+// An add operation to adjust the SP.
+// ADD (SP plus register)
+static bool
+emulate_add_sp_rm (EmulateInstructionARM *emulator, 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 = emulator->OpcodeAsUnsigned (&success);
+ if (!success)
+ return false;
+
+ if (emulator->ConditionPassed())
+ {
+ const addr_t sp = emulator->ReadRegisterUnsigned (eRegisterKindGeneric, LLDB_REGNUM_GENERIC_SP, 0, &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 = emulator->ReadRegisterUnsigned(eRegisterKindDWARF, dwarf_r0 + Rm, 0, &success);
+ if (!success)
+ return false;
+
+ addr_t addr = (int32_t)sp + reg_value; // the adjusted stack pointer value
+
+ EmulateInstruction::Context context = { EmulateInstruction::eContextAdjustStackPointer,
+ eRegisterKindGeneric,
+ LLDB_REGNUM_GENERIC_SP,
+ reg_value };
+
+ if (!emulator->WriteRegisterUnsigned (context, eRegisterKindGeneric, LLDB_REGNUM_GENERIC_SP, addr))
+ return false;
+ }
+ return true;
+}
+
+// Set r7 to point to some ip offset.
+// SUB (immediate)
+static bool
+emulate_sub_r7_ip_imm (EmulateInstructionARM *emulator, 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 = emulator->OpcodeAsUnsigned (&success);
+ if (!success)
+ return false;
+
+ if (emulator->ConditionPassed())
+ {
+ const addr_t ip = emulator->ReadRegisterUnsigned (eRegisterKindDWARF, dwarf_r12, 0, &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 = { EmulateInstruction::eContextRegisterPlusOffset,
+ eRegisterKindDWARF,
+ dwarf_r12,
+ -ip_offset };
+
+ if (!emulator->WriteRegisterUnsigned (context, eRegisterKindDWARF, dwarf_r7, addr))
+ return false;
+ }
+ return true;
+}
+
+// Set ip to point to some stack offset.
+// SUB (SP minus immediate)
+static bool
+emulate_sub_ip_sp_imm (EmulateInstructionARM *emulator, 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 = emulator->OpcodeAsUnsigned (&success);
+ if (!success)
+ return false;
+
+ if (emulator->ConditionPassed())
+ {
+ const addr_t sp = emulator->ReadRegisterUnsigned (eRegisterKindGeneric, LLDB_REGNUM_GENERIC_SP, 0, &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 = { EmulateInstruction::eContextRegisterPlusOffset,
+ eRegisterKindGeneric,
+ LLDB_REGNUM_GENERIC_SP,
+ -sp_offset };
+
+ if (!emulator->WriteRegisterUnsigned (context, eRegisterKindDWARF, dwarf_r12, addr))
+ return false;
+ }
+ return true;
+}
+
+// A sub operation to adjust the SP -- allocate space for local storage.
+static bool
+emulate_sub_sp_imm (EmulateInstructionARM *emulator, 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 = emulator->OpcodeAsUnsigned (&success);
+ if (!success)
+ return false;
+
+ if (emulator->ConditionPassed())
+ {
+ const addr_t sp = emulator->ReadRegisterUnsigned (eRegisterKindGeneric, LLDB_REGNUM_GENERIC_SP, 0, &success);
+ if (!success)
+ return false;
+ uint32_t imm32;
+ switch (encoding) {
+ case eEncodingT1:
+ imm32 = ThumbImmScaled(opcode); // imm32 = ZeroExtend(imm7:'00', 32)
+ 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 = { EmulateInstruction::eContextAdjustStackPointer,
+ eRegisterKindGeneric,
+ LLDB_REGNUM_GENERIC_SP,
+ -sp_offset };
+
+ if (!emulator->WriteRegisterUnsigned (context, eRegisterKindGeneric, LLDB_REGNUM_GENERIC_SP, addr))
+ return false;
+ }
+ return true;
+}
+
+// A store operation to the stack that also updates the SP.
+static bool
+emulate_str_rt_sp (EmulateInstructionARM *emulator, 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 = emulator->OpcodeAsUnsigned (&success);
+ if (!success)
+ return false;
+
+ if (emulator->ConditionPassed())
+ {
+ const uint32_t addr_byte_size = emulator->GetAddressByteSize();
+ const addr_t sp = emulator->ReadRegisterUnsigned (eRegisterKindGeneric, LLDB_REGNUM_GENERIC_SP, 0, &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 = { EmulateInstruction::eContextPushRegisterOnStack, eRegisterKindDWARF, 0, 0 };
+ if (Rt != 15)
+ {
+ context.arg1 = dwarf_r0 + Rt; // arg1 in the context is the DWARF register number
+ context.arg2 = addr - sp; // arg2 in the context is the stack pointer offset
+ uint32_t reg_value = emulator->ReadRegisterUnsigned(eRegisterKindDWARF, context.arg1, 0, &success);
+ if (!success)
+ return false;
+ if (!emulator->WriteMemoryUnsigned (context, addr, reg_value, addr_byte_size))
+ return false;
+ }
+ else
+ {
+ context.arg1 = dwarf_pc; // arg1 in the context is the DWARF register number
+ context.arg2 = addr - sp; // arg2 in the context is the stack pointer offset
+ const uint32_t pc = emulator->ReadRegisterUnsigned(eRegisterKindGeneric, LLDB_REGNUM_GENERIC_PC, 0, &success);
+ if (!success)
+ return false;
+ if (!emulator->WriteMemoryUnsigned (context, addr, pc + 8, addr_byte_size))
+ return false;
+ }
+
+ context.type = EmulateInstruction::eContextAdjustStackPointer;
+ context.arg0 = eRegisterKindGeneric;
+ context.arg1 = LLDB_REGNUM_GENERIC_SP;
+ context.arg2 = -sp_offset;
+
+ if (!emulator->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.
+static bool
+emulate_vpush (EmulateInstructionARM *emulator, 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 = emulator->OpcodeAsUnsigned (&success);
+ if (!success)
+ return false;
+
+ if (emulator->ConditionPassed())
+ {
+ const uint32_t addr_byte_size = emulator->GetAddressByteSize();
+ const addr_t sp = emulator->ReadRegisterUnsigned (eRegisterKindGeneric, LLDB_REGNUM_GENERIC_SP, 0, &success);
+ if (!success)
+ return false;
+ bool single_regs;
+ uint32_t d; // 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 = Bits32(opcode, 15, 12) << 1 | Bits32(opcode, 22, 22);
+ 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 | Bits32(opcode, 22, 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 = { EmulateInstruction::eContextPushRegisterOnStack, eRegisterKindDWARF, 0, 0 };
+ for (i=d; i<regs; ++i)
+ {
+ context.arg1 = start_reg + i; // arg1 in the context is the DWARF register number
+ context.arg2 = addr - sp; // arg2 in the context is the stack pointer offset
+ // uint64_t to accommodate 64-bit registers.
+ uint64_t reg_value = emulator->ReadRegisterUnsigned(eRegisterKindDWARF, context.arg1, 0, &success);
+ if (!success)
+ return false;
+ if (!emulator->WriteMemoryUnsigned (context, addr, reg_value, reg_byte_size))
+ return false;
+ addr += reg_byte_size;
+ }
+
+ context.type = EmulateInstruction::eContextAdjustStackPointer;
+ context.arg0 = eRegisterKindGeneric;
+ context.arg1 = LLDB_REGNUM_GENERIC_SP;
+ context.arg2 = -sp_offset;
+
+ if (!emulator->WriteRegisterUnsigned (context, eRegisterKindGeneric, LLDB_REGNUM_GENERIC_SP, sp - sp_offset))
+ return false;
+ }
+ return true;
+}
+
+static ARMOpcode g_arm_opcodes[] =
+{
+ ///////////////////////////
+ // Prologue instructions //
+ ///////////////////////////
+
+ // push register(s)
+ { 0x0fff0000, 0x092d0000, ARMvAll, eEncodingA1, eSize32, emulate_push, "push <registers>" },
+ { 0x0fff0fff, 0x052d0004, ARMvAll, eEncodingA2, eSize32, emulate_push, "push <register>" },
+
+ // set r7 to point to a stack offset
+ { 0x0ffff000, 0x028d7000, ARMvAll, eEncodingA1, eSize32, emulate_add_rd_sp_imm, "add r7, sp, #<const>" },
+ { 0x0ffff000, 0x024c7000, ARMvAll, eEncodingA1, eSize32, emulate_sub_r7_ip_imm, "sub r7, ip, #<const>"},
+ // set ip to point to a stack offset
+ { 0x0fffffff, 0x01a0c00d, ARMvAll, eEncodingA1, eSize32, emulate_mov_rd_sp, "mov ip, sp" },
+ { 0x0ffff000, 0x028dc000, ARMvAll, eEncodingA1, eSize32, emulate_add_rd_sp_imm, "add ip, sp, #<const>" },
+ { 0x0ffff000, 0x024dc000, ARMvAll, eEncodingA1, eSize32, emulate_sub_ip_sp_imm, "sub ip, sp, #<const>"},
+
+ // adjust the stack pointer
+ { 0x0ffff000, 0x024dd000, ARMvAll, eEncodingA1, eSize32, emulate_sub_sp_imm, "sub sp, sp, #<const>"},
+
+ // push one register
+ // if Rn == '1101' && imm12 == '000000000100' then SEE PUSH;
+ { 0x0fff0000, 0x052d0000, ARMvAll, eEncodingA1, eSize32, emulate_str_rt_sp, "str Rt, [sp, #-imm12]!" },
+
+ // vector push consecutive extension register(s)
+ { 0x0fbf0f00, 0x0d2d0b00, ARMv6T2|ARMv7, eEncodingA1, eSize32, emulate_vpush, "vpush.64 <list>"},
+ { 0x0fbf0f00, 0x0d2d0a00, ARMv6T2|ARMv7, eEncodingA2, eSize32, emulate_vpush, "vpush.32 <list>"},
+
+ ///////////////////////////
+ // Epilogue instructions //
+ ///////////////////////////
+
+ { 0x0fff0000, 0x08bd0000, ARMvAll, eEncodingA1, eSize32, emulate_pop, "pop <registers>"},
+ { 0x0fff0fff, 0x049d0004, ARMvAll, eEncodingA2, eSize32, emulate_pop, "pop <register>"}
+};
+
+static ARMOpcode g_thumb_opcodes[] =
+{
+ ///////////////////////////
+ // Prologue instructions //
+ ///////////////////////////
+
+ // push register(s)
+ { 0xfffffe00, 0x0000b400, ARMvAll, eEncodingT1, eSize16, emulate_push, "push <registers>" },
+ { 0xffff0000, 0xe92d0000, ARMv6T2|ARMv7, eEncodingT2, eSize32, emulate_push, "push.w <registers>" },
+ { 0xffff0fff, 0xf84d0d04, ARMv6T2|ARMv7, eEncodingT3, eSize32, emulate_push, "push.w <register>" },
+ // move from high register to low register
+ { 0xffffffc0, 0x00004640, ARMvAll, eEncodingT1, eSize16, emulate_mov_low_high, "mov r0-r7, r8-r15" },
+
+ // set r7 to point to a stack offset
+ { 0xffffff00, 0x0000af00, ARMvAll, eEncodingT1, eSize16, emulate_add_rd_sp_imm, "add r7, sp, #imm" },
+ { 0xffffffff, 0x0000466f, ARMvAll, eEncodingT1, eSize16, emulate_mov_rd_sp, "mov r7, sp" },
+
+ // PC relative load into register (see also emulate_add_sp_rm)
+ { 0xfffff800, 0x00004800, ARMvAll, eEncodingT1, eSize16, emulate_ldr_rd_pc_rel, "ldr <Rd>, [PC, #imm]"},
+
+ // adjust the stack pointer
+ { 0xffffff87, 0x00004485, ARMvAll, eEncodingT2, eSize16, emulate_add_sp_rm, "add sp, <Rm>"},
+ { 0xffffff80, 0x0000b080, ARMvAll, eEncodingT1, eSize16, emulate_sub_sp_imm, "add sp, sp, #imm"},
+ { 0xfbef8f00, 0xf1ad0d00, ARMv6T2|ARMv7, eEncodingT2, eSize32, emulate_sub_sp_imm, "sub.w sp, sp, #<const>"},
+ { 0xfbff8f00, 0xf2ad0d00, ARMv6T2|ARMv7, eEncodingT3, eSize32, emulate_sub_sp_imm, "subw sp, sp, #imm12"},
+
+ // vector push consecutive extension register(s)
+ { 0xffbf0f00, 0xed2d0b00, ARMv6T2|ARMv7, eEncodingT1, eSize32, emulate_vpush, "vpush.64 <list>"},
+ { 0xffbf0f00, 0xed2d0a00, ARMv6T2|ARMv7, eEncodingT2, eSize32, emulate_vpush, "vpush.32 <list>"},
+
+ ///////////////////////////
+ // Epilogue instructions //
+ ///////////////////////////
+
+ { 0xffffff80, 0x0000b000, ARMvAll, eEncodingT2, eSize16, emulate_add_sp_imm, "add sp, #imm"},
+ { 0xfffffe00, 0x0000bc00, ARMvAll, eEncodingT1, eSize16, emulate_pop, "pop <registers>"},
+ { 0xffff0000, 0xe8bd0000, ARMv6T2|ARMv7, eEncodingT2, eSize32, emulate_pop, "pop.w <registers>" },
+ { 0xffff0fff, 0xf85d0d04, ARMv6T2|ARMv7, eEncodingT3, eSize32, emulate_pop, "pop.w <register>" }
+};
+
+static const size_t k_num_arm_opcodes = sizeof(g_arm_opcodes)/sizeof(ARMOpcode);
+static const size_t k_num_thumb_opcodes = sizeof(g_thumb_opcodes)/sizeof(ARMOpcode);
+
+bool
+EmulateInstructionARM::SetTargetTriple (const ConstString &triple)
+{
+ m_arm_isa = 0;
+ const char *triple_cstr = triple.GetCString();
+ if (triple_cstr)
+ {
+ const char *dash = ::strchr (triple_cstr, '-');
+ if (dash)
+ {
+ std::string arch (triple_cstr, dash);
+ const char *arch_cstr = arch.c_str();
+ if (strcasecmp(arch_cstr, "armv4t") == 0)
+ m_arm_isa = ARMv4T;
+ else if (strcasecmp(arch_cstr, "armv4") == 0)
+ m_arm_isa = ARMv4;
+ else if (strcasecmp(arch_cstr, "armv5tej") == 0)
+ m_arm_isa = ARMv5TEJ;
+ else if (strcasecmp(arch_cstr, "armv5te") == 0)
+ m_arm_isa = ARMv5TE;
+ else if (strcasecmp(arch_cstr, "armv5t") == 0)
+ m_arm_isa = ARMv5T;
+ else if (strcasecmp(arch_cstr, "armv6k") == 0)
+ m_arm_isa = ARMv6K;
+ else if (strcasecmp(arch_cstr, "armv6") == 0)
+ m_arm_isa = ARMv6;
+ else if (strcasecmp(arch_cstr, "armv6t2") == 0)
+ m_arm_isa = ARMv6T2;
+ else if (strcasecmp(arch_cstr, "armv7") == 0)
+ m_arm_isa = ARMv7;
+ else if (strcasecmp(arch_cstr, "armv8") == 0)
+ 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 = {eContextReadOpcode, 0, 0};
+ if (m_inst_cpsr & MASK_CPSR_T)
+ {
+ m_inst_mode = eModeThumb;
+ uint32_t thumb_opcode = ReadMemoryUnsigned(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) | ReadMemoryUnsigned(read_inst_context, pc + 2, 2, 0, &success);
+ }
+ }
+ }
+ else
+ {
+ m_inst_mode = eModeARM;
+ m_inst.opcode_type = eOpcode32;
+ m_inst.opcode.inst32 = ReadMemoryUnsigned(read_inst_context, pc, 4, 0, &success);
+ }
+ }
+ }
+ if (!success)
+ {
+ m_inst_mode = eModeInvalid;
+ m_inst_pc = LLDB_INVALID_ADDRESS;
+ }
+ return success;
+}
+
+uint32_t
+EmulateInstructionARM::CurrentCond ()
+{
+ switch (m_inst_mode)
+ {
+ default:
+ case eModeInvalid:
+ break;
+
+ case eModeARM:
+ return UnsignedBits(m_inst.opcode.inst32, 31, 28);
+
+ case eModeThumb:
+ return 0x0000000Eu; // Return always for now, we need to handl IT instructions later
+ }
+ return UINT32_MAX; // Return invalid value
+}
+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;
+}
+
+
+bool
+EmulateInstructionARM::EvaluateInstruction ()
+{
+ return false;
+}
diff --git a/source/Plugins/Instruction/ARM/EmulateInstructionARM.h b/source/Plugins/Instruction/ARM/EmulateInstructionARM.h
new file mode 100644
index 0000000..acb755a
--- /dev/null
+++ b/source/Plugins/Instruction/ARM/EmulateInstructionARM.h
@@ -0,0 +1,109 @@
+//===-- lldb_EmulateInstructionARM.h ------------------------------------*- C++ -*-===//
+//
+// The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef lldb_EmulateInstructionARM_h_
+#define lldb_EmulateInstructionARM_h_
+
+#include "lldb/Core/EmulateInstruction.h"
+#include "lldb/Core/Error.h"
+
+namespace lldb_private {
+
+class EmulateInstructionARM : public EmulateInstruction
+{
+public:
+
+ virtual const char *
+ GetPluginName()
+ {
+ return "EmulateInstructionARM";
+ }
+
+ virtual const char *
+ GetShortPluginName()
+ {
+ return "lldb.emulate-instruction.arm";
+ }
+
+ virtual uint32_t
+ GetPluginVersion()
+ {
+ return 1;
+ }
+
+ virtual void
+ GetPluginCommandHelp (const char *command, Stream *strm)
+ {
+ }
+
+ virtual lldb_private::Error
+ ExecutePluginCommand (Args &command, Stream *strm)
+ {
+ Error error;
+ error.SetErrorString("no plug-in commands are supported");
+ return error;
+ }
+
+ virtual Log *
+ EnablePluginLogging (Stream *strm, Args &command)
+ {
+ return NULL;
+ }
+
+ enum Mode
+ {
+ eModeInvalid,
+ eModeARM,
+ eModeThumb
+ };
+
+ EmulateInstructionARM (void *baton,
+ ReadMemory read_mem_callback,
+ WriteMemory write_mem_callback,
+ ReadRegister read_reg_callback,
+ WriteRegister write_reg_callback) :
+ EmulateInstruction (lldb::eByteOrderLittle, // Byte order for ARM
+ 4, // Address size in byte
+ baton,
+ read_mem_callback,
+ write_mem_callback,
+ read_reg_callback,
+ write_reg_callback),
+ m_arm_isa (0),
+ m_inst_mode (eModeInvalid),
+ m_inst_cpsr (0)
+ {
+ }
+
+
+ virtual bool
+ SetTargetTriple (const ConstString &triple);
+
+ virtual bool
+ ReadInstruction ();
+
+ virtual bool
+ EvaluateInstruction ();
+
+ bool
+ ConditionPassed ();
+
+ uint32_t
+ CurrentCond ();
+
+protected:
+ uint32_t m_arm_isa;
+ Mode m_inst_mode;
+ uint32_t m_inst_cpsr;
+
+};
+
+} // namespace lldb_private
+
+#endif // lldb_EmulateInstructionARM_h_