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// Copyright 2010 the V8 project authors. All rights reserved.
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
// * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
// * Redistributions in binary form must reproduce the above
// copyright notice, this list of conditions and the following
// disclaimer in the documentation and/or other materials provided
// with the distribution.
// * Neither the name of Google Inc. nor the names of its
// contributors may be used to endorse or promote products derived
// from this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
// Declares a Simulator for MIPS instructions if we are not generating a native
// MIPS binary. This Simulator allows us to run and debug MIPS code generation
// on regular desktop machines.
// V8 calls into generated code by "calling" the CALL_GENERATED_CODE macro,
// which will start execution in the Simulator or forwards to the real entry
// on a MIPS HW platform.
#ifndef V8_MIPS_SIMULATOR_MIPS_H_
#define V8_MIPS_SIMULATOR_MIPS_H_
#include "allocation.h"
#if defined(__mips) && !defined(USE_SIMULATOR)
// When running without a simulator we call the entry directly.
#define CALL_GENERATED_CODE(entry, p0, p1, p2, p3, p4) \
entry(p0, p1, p2, p3, p4);
// The stack limit beyond which we will throw stack overflow errors in
// generated code. Because generated code on mips uses the C stack, we
// just use the C stack limit.
class SimulatorStack : public v8::internal::AllStatic {
public:
static inline uintptr_t JsLimitFromCLimit(uintptr_t c_limit) {
return c_limit;
}
static inline uintptr_t RegisterCTryCatch(uintptr_t try_catch_address) {
return try_catch_address;
}
static inline void UnregisterCTryCatch() { }
};
// Calculated the stack limit beyond which we will throw stack overflow errors.
// This macro must be called from a C++ method. It relies on being able to take
// the address of "this" to get a value on the current execution stack and then
// calculates the stack limit based on that value.
// NOTE: The check for overflow is not safe as there is no guarantee that the
// running thread has its stack in all memory up to address 0x00000000.
#define GENERATED_CODE_STACK_LIMIT(limit) \
(reinterpret_cast<uintptr_t>(this) >= limit ? \
reinterpret_cast<uintptr_t>(this) - limit : 0)
// Call the generated regexp code directly. The entry function pointer should
// expect seven int/pointer sized arguments and return an int.
#define CALL_GENERATED_REGEXP_CODE(entry, p0, p1, p2, p3, p4, p5, p6) \
entry(p0, p1, p2, p3, p4, p5, p6)
#define TRY_CATCH_FROM_ADDRESS(try_catch_address) \
reinterpret_cast<TryCatch*>(try_catch_address)
#else // #if !defined(__mips) || defined(USE_SIMULATOR)
// When running with the simulator transition into simulated execution at this
// point.
#define CALL_GENERATED_CODE(entry, p0, p1, p2, p3, p4) \
reinterpret_cast<Object*>(\
assembler::mips::Simulator::current()->Call(FUNCTION_ADDR(entry), 5, \
p0, p1, p2, p3, p4))
#define CALL_GENERATED_REGEXP_CODE(entry, p0, p1, p2, p3, p4, p5, p6) \
assembler::mips::Simulator::current()->Call(\
FUNCTION_ADDR(entry), 7, p0, p1, p2, p3, p4, p5, p6)
#define TRY_CATCH_FROM_ADDRESS(try_catch_address) \
try_catch_address == NULL ? \
NULL : *(reinterpret_cast<TryCatch**>(try_catch_address))
namespace assembler {
namespace mips {
class Simulator {
public:
friend class Debugger;
// Registers are declared in order. See SMRL chapter 2.
enum Register {
no_reg = -1,
zero_reg = 0,
at,
v0, v1,
a0, a1, a2, a3,
t0, t1, t2, t3, t4, t5, t6, t7,
s0, s1, s2, s3, s4, s5, s6, s7,
t8, t9,
k0, k1,
gp,
sp,
s8,
ra,
// LO, HI, and pc
LO,
HI,
pc, // pc must be the last register.
kNumSimuRegisters,
// aliases
fp = s8
};
// Coprocessor registers.
// Generated code will always use doubles. So we will only use even registers.
enum FPURegister {
f0, f1, f2, f3, f4, f5, f6, f7, f8, f9, f10, f11,
f12, f13, f14, f15, // f12 and f14 are arguments FPURegisters
f16, f17, f18, f19, f20, f21, f22, f23, f24, f25,
f26, f27, f28, f29, f30, f31,
kNumFPURegisters
};
Simulator();
~Simulator();
// The currently executing Simulator instance. Potentially there can be one
// for each native thread.
static Simulator* current();
// Accessors for register state. Reading the pc value adheres to the MIPS
// architecture specification and is off by a 8 from the currently executing
// instruction.
void set_register(int reg, int32_t value);
int32_t get_register(int reg) const;
// Same for FPURegisters
void set_fpu_register(int fpureg, int32_t value);
void set_fpu_register_double(int fpureg, double value);
int32_t get_fpu_register(int fpureg) const;
double get_fpu_register_double(int fpureg) const;
// Special case of set_register and get_register to access the raw PC value.
void set_pc(int32_t value);
int32_t get_pc() const;
// Accessor to the internal simulator stack area.
uintptr_t StackLimit() const;
// Executes MIPS instructions until the PC reaches end_sim_pc.
void Execute();
// Call on program start.
static void Initialize();
// V8 generally calls into generated JS code with 5 parameters and into
// generated RegExp code with 7 parameters. This is a convenience function,
// which sets up the simulator state and grabs the result on return.
int32_t Call(byte_* entry, int argument_count, ...);
// Push an address onto the JS stack.
uintptr_t PushAddress(uintptr_t address);
// Pop an address from the JS stack.
uintptr_t PopAddress();
private:
enum special_values {
// Known bad pc value to ensure that the simulator does not execute
// without being properly setup.
bad_ra = -1,
// A pc value used to signal the simulator to stop execution. Generally
// the ra is set to this value on transition from native C code to
// simulated execution, so that the simulator can "return" to the native
// C code.
end_sim_pc = -2,
// Unpredictable value.
Unpredictable = 0xbadbeaf
};
// Unsupported instructions use Format to print an error and stop execution.
void Format(Instruction* instr, const char* format);
// Read and write memory.
inline uint32_t ReadBU(int32_t addr);
inline int32_t ReadB(int32_t addr);
inline void WriteB(int32_t addr, uint8_t value);
inline void WriteB(int32_t addr, int8_t value);
inline uint16_t ReadHU(int32_t addr, Instruction* instr);
inline int16_t ReadH(int32_t addr, Instruction* instr);
// Note: Overloaded on the sign of the value.
inline void WriteH(int32_t addr, uint16_t value, Instruction* instr);
inline void WriteH(int32_t addr, int16_t value, Instruction* instr);
inline int ReadW(int32_t addr, Instruction* instr);
inline void WriteW(int32_t addr, int value, Instruction* instr);
inline double ReadD(int32_t addr, Instruction* instr);
inline void WriteD(int32_t addr, double value, Instruction* instr);
// Operations depending on endianness.
// Get Double Higher / Lower word.
inline int32_t GetDoubleHIW(double* addr);
inline int32_t GetDoubleLOW(double* addr);
// Set Double Higher / Lower word.
inline int32_t SetDoubleHIW(double* addr);
inline int32_t SetDoubleLOW(double* addr);
// Executing is handled based on the instruction type.
void DecodeTypeRegister(Instruction* instr);
void DecodeTypeImmediate(Instruction* instr);
void DecodeTypeJump(Instruction* instr);
// Used for breakpoints and traps.
void SoftwareInterrupt(Instruction* instr);
// Executes one instruction.
void InstructionDecode(Instruction* instr);
// Execute one instruction placed in a branch delay slot.
void BranchDelayInstructionDecode(Instruction* instr) {
if (instr->IsForbiddenInBranchDelay()) {
V8_Fatal(__FILE__, __LINE__,
"Eror:Unexpected %i opcode in a branch delay slot.",
instr->OpcodeField());
}
InstructionDecode(instr);
}
enum Exception {
none,
kIntegerOverflow,
kIntegerUnderflow,
kDivideByZero,
kNumExceptions
};
int16_t exceptions[kNumExceptions];
// Exceptions.
void SignalExceptions();
// Runtime call support.
static void* RedirectExternalReference(void* external_function,
bool fp_return);
// Used for real time calls that takes two double values as arguments and
// returns a double.
void SetFpResult(double result);
// Architecture state.
// Registers.
int32_t registers_[kNumSimuRegisters];
// Coprocessor Registers.
int32_t FPUregisters_[kNumFPURegisters];
// Simulator support.
char* stack_;
bool pc_modified_;
int icount_;
static bool initialized_;
// Registered breakpoints.
Instruction* break_pc_;
Instr break_instr_;
};
} } // namespace assembler::mips
// The simulator has its own stack. Thus it has a different stack limit from
// the C-based native code. Setting the c_limit to indicate a very small
// stack cause stack overflow errors, since the simulator ignores the input.
// This is unlikely to be an issue in practice, though it might cause testing
// trouble down the line.
class SimulatorStack : public v8::internal::AllStatic {
public:
static inline uintptr_t JsLimitFromCLimit(uintptr_t c_limit) {
return assembler::mips::Simulator::current()->StackLimit();
}
static inline uintptr_t RegisterCTryCatch(uintptr_t try_catch_address) {
assembler::mips::Simulator* sim = assembler::mips::Simulator::current();
return sim->PushAddress(try_catch_address);
}
static inline void UnregisterCTryCatch() {
assembler::mips::Simulator::current()->PopAddress();
}
};
#endif // !defined(__mips) || defined(USE_SIMULATOR)
#endif // V8_MIPS_SIMULATOR_MIPS_H_