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simulator-mips.cc
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// Copyright 2011 the V8 project authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include <limits.h>
#include <stdarg.h>
#include <stdlib.h>
#include <cmath>
#include "src/v8.h"
#if V8_TARGET_ARCH_MIPS
#include "src/assembler.h"
#include "src/disasm.h"
#include "src/globals.h" // Need the BitCast.
#include "src/mips/constants-mips.h"
#include "src/mips/simulator-mips.h"
// Only build the simulator if not compiling for real MIPS hardware.
#if defined(USE_SIMULATOR)
namespace v8 {
namespace internal {
// Utils functions.
bool HaveSameSign(int32_t a, int32_t b) {
return ((a ^ b) >= 0);
}
uint32_t get_fcsr_condition_bit(uint32_t cc) {
if (cc == 0) {
return 23;
} else {
return 24 + cc;
}
}
// This macro provides a platform independent use of sscanf. The reason for
// SScanF not being implemented in a platform independent was through
// ::v8::internal::OS in the same way as SNPrintF is that the Windows C Run-Time
// Library does not provide vsscanf.
#define SScanF sscanf // NOLINT
// The MipsDebugger class is used by the simulator while debugging simulated
// code.
class MipsDebugger {
public:
explicit MipsDebugger(Simulator* sim) : sim_(sim) { }
~MipsDebugger();
void Stop(Instruction* instr);
void Debug();
// Print all registers with a nice formatting.
void PrintAllRegs();
void PrintAllRegsIncludingFPU();
private:
// We set the breakpoint code to 0xfffff to easily recognize it.
static const Instr kBreakpointInstr = SPECIAL | BREAK | 0xfffff << 6;
static const Instr kNopInstr = 0x0;
Simulator* sim_;
int32_t GetRegisterValue(int regnum);
int32_t GetFPURegisterValueInt(int regnum);
int64_t GetFPURegisterValueLong(int regnum);
float GetFPURegisterValueFloat(int regnum);
double GetFPURegisterValueDouble(int regnum);
bool GetValue(const char* desc, int32_t* value);
// Set or delete a breakpoint. Returns true if successful.
bool SetBreakpoint(Instruction* breakpc);
bool DeleteBreakpoint(Instruction* breakpc);
// Undo and redo all breakpoints. This is needed to bracket disassembly and
// execution to skip past breakpoints when run from the debugger.
void UndoBreakpoints();
void RedoBreakpoints();
};
MipsDebugger::~MipsDebugger() {
}
#ifdef GENERATED_CODE_COVERAGE
static FILE* coverage_log = NULL;
static void InitializeCoverage() {
char* file_name = getenv("V8_GENERATED_CODE_COVERAGE_LOG");
if (file_name != NULL) {
coverage_log = fopen(file_name, "aw+");
}
}
void MipsDebugger::Stop(Instruction* instr) {
// Get the stop code.
uint32_t code = instr->Bits(25, 6);
// Retrieve the encoded address, which comes just after this stop.
char** msg_address =
reinterpret_cast<char**>(sim_->get_pc() + Instr::kInstrSize);
char* msg = *msg_address;
ASSERT(msg != NULL);
// Update this stop description.
if (!watched_stops_[code].desc) {
watched_stops_[code].desc = msg;
}
if (strlen(msg) > 0) {
if (coverage_log != NULL) {
fprintf(coverage_log, "%s\n", str);
fflush(coverage_log);
}
// Overwrite the instruction and address with nops.
instr->SetInstructionBits(kNopInstr);
reinterpret_cast<Instr*>(msg_address)->SetInstructionBits(kNopInstr);
}
sim_->set_pc(sim_->get_pc() + 2 * Instruction::kInstructionSize);
}
#else // GENERATED_CODE_COVERAGE
#define UNSUPPORTED() printf("Unsupported instruction.\n");
static void InitializeCoverage() {}
void MipsDebugger::Stop(Instruction* instr) {
// Get the stop code.
uint32_t code = instr->Bits(25, 6);
// Retrieve the encoded address, which comes just after this stop.
char* msg = *reinterpret_cast<char**>(sim_->get_pc() +
Instruction::kInstrSize);
// Update this stop description.
if (!sim_->watched_stops_[code].desc) {
sim_->watched_stops_[code].desc = msg;
}
PrintF("Simulator hit %s (%u)\n", msg, code);
sim_->set_pc(sim_->get_pc() + 2 * Instruction::kInstrSize);
Debug();
}
#endif // GENERATED_CODE_COVERAGE
int32_t MipsDebugger::GetRegisterValue(int regnum) {
if (regnum == kNumSimuRegisters) {
return sim_->get_pc();
} else {
return sim_->get_register(regnum);
}
}
int32_t MipsDebugger::GetFPURegisterValueInt(int regnum) {
if (regnum == kNumFPURegisters) {
return sim_->get_pc();
} else {
return sim_->get_fpu_register(regnum);
}
}
int64_t MipsDebugger::GetFPURegisterValueLong(int regnum) {
if (regnum == kNumFPURegisters) {
return sim_->get_pc();
} else {
return sim_->get_fpu_register_long(regnum);
}
}
float MipsDebugger::GetFPURegisterValueFloat(int regnum) {
if (regnum == kNumFPURegisters) {
return sim_->get_pc();
} else {
return sim_->get_fpu_register_float(regnum);
}
}
double MipsDebugger::GetFPURegisterValueDouble(int regnum) {
if (regnum == kNumFPURegisters) {
return sim_->get_pc();
} else {
return sim_->get_fpu_register_double(regnum);
}
}
bool MipsDebugger::GetValue(const char* desc, int32_t* value) {
int regnum = Registers::Number(desc);
int fpuregnum = FPURegisters::Number(desc);
if (regnum != kInvalidRegister) {
*value = GetRegisterValue(regnum);
return true;
} else if (fpuregnum != kInvalidFPURegister) {
*value = GetFPURegisterValueInt(fpuregnum);
return true;
} else if (strncmp(desc, "0x", 2) == 0) {
return SScanF(desc, "%x", reinterpret_cast<uint32_t*>(value)) == 1;
} else {
return SScanF(desc, "%i", value) == 1;
}
return false;
}
bool MipsDebugger::SetBreakpoint(Instruction* breakpc) {
// Check if a breakpoint can be set. If not return without any side-effects.
if (sim_->break_pc_ != NULL) {
return false;
}
// Set the breakpoint.
sim_->break_pc_ = breakpc;
sim_->break_instr_ = breakpc->InstructionBits();
// Not setting the breakpoint instruction in the code itself. It will be set
// when the debugger shell continues.
return true;
}
bool MipsDebugger::DeleteBreakpoint(Instruction* breakpc) {
if (sim_->break_pc_ != NULL) {
sim_->break_pc_->SetInstructionBits(sim_->break_instr_);
}
sim_->break_pc_ = NULL;
sim_->break_instr_ = 0;
return true;
}
void MipsDebugger::UndoBreakpoints() {
if (sim_->break_pc_ != NULL) {
sim_->break_pc_->SetInstructionBits(sim_->break_instr_);
}
}
void MipsDebugger::RedoBreakpoints() {
if (sim_->break_pc_ != NULL) {
sim_->break_pc_->SetInstructionBits(kBreakpointInstr);
}
}
void MipsDebugger::PrintAllRegs() {
#define REG_INFO(n) Registers::Name(n), GetRegisterValue(n), GetRegisterValue(n)
PrintF("\n");
// at, v0, a0.
PrintF("%3s: 0x%08x %10d\t%3s: 0x%08x %10d\t%3s: 0x%08x %10d\n",
REG_INFO(1), REG_INFO(2), REG_INFO(4));
// v1, a1.
PrintF("%26s\t%3s: 0x%08x %10d\t%3s: 0x%08x %10d\n",
"", REG_INFO(3), REG_INFO(5));
// a2.
PrintF("%26s\t%26s\t%3s: 0x%08x %10d\n", "", "", REG_INFO(6));
// a3.
PrintF("%26s\t%26s\t%3s: 0x%08x %10d\n", "", "", REG_INFO(7));
PrintF("\n");
// t0-t7, s0-s7
for (int i = 0; i < 8; i++) {
PrintF("%3s: 0x%08x %10d\t%3s: 0x%08x %10d\n",
REG_INFO(8+i), REG_INFO(16+i));
}
PrintF("\n");
// t8, k0, LO.
PrintF("%3s: 0x%08x %10d\t%3s: 0x%08x %10d\t%3s: 0x%08x %10d\n",
REG_INFO(24), REG_INFO(26), REG_INFO(32));
// t9, k1, HI.
PrintF("%3s: 0x%08x %10d\t%3s: 0x%08x %10d\t%3s: 0x%08x %10d\n",
REG_INFO(25), REG_INFO(27), REG_INFO(33));
// sp, fp, gp.
PrintF("%3s: 0x%08x %10d\t%3s: 0x%08x %10d\t%3s: 0x%08x %10d\n",
REG_INFO(29), REG_INFO(30), REG_INFO(28));
// pc.
PrintF("%3s: 0x%08x %10d\t%3s: 0x%08x %10d\n",
REG_INFO(31), REG_INFO(34));
#undef REG_INFO
#undef FPU_REG_INFO
}
void MipsDebugger::PrintAllRegsIncludingFPU() {
#define FPU_REG_INFO(n) FPURegisters::Name(n), FPURegisters::Name(n+1), \
GetFPURegisterValueInt(n+1), \
GetFPURegisterValueInt(n), \
GetFPURegisterValueDouble(n)
PrintAllRegs();
PrintF("\n\n");
// f0, f1, f2, ... f31.
PrintF("%3s,%3s: 0x%08x%08x %16.4e\n", FPU_REG_INFO(0) );
PrintF("%3s,%3s: 0x%08x%08x %16.4e\n", FPU_REG_INFO(2) );
PrintF("%3s,%3s: 0x%08x%08x %16.4e\n", FPU_REG_INFO(4) );
PrintF("%3s,%3s: 0x%08x%08x %16.4e\n", FPU_REG_INFO(6) );
PrintF("%3s,%3s: 0x%08x%08x %16.4e\n", FPU_REG_INFO(8) );
PrintF("%3s,%3s: 0x%08x%08x %16.4e\n", FPU_REG_INFO(10));
PrintF("%3s,%3s: 0x%08x%08x %16.4e\n", FPU_REG_INFO(12));
PrintF("%3s,%3s: 0x%08x%08x %16.4e\n", FPU_REG_INFO(14));
PrintF("%3s,%3s: 0x%08x%08x %16.4e\n", FPU_REG_INFO(16));
PrintF("%3s,%3s: 0x%08x%08x %16.4e\n", FPU_REG_INFO(18));
PrintF("%3s,%3s: 0x%08x%08x %16.4e\n", FPU_REG_INFO(20));
PrintF("%3s,%3s: 0x%08x%08x %16.4e\n", FPU_REG_INFO(22));
PrintF("%3s,%3s: 0x%08x%08x %16.4e\n", FPU_REG_INFO(24));
PrintF("%3s,%3s: 0x%08x%08x %16.4e\n", FPU_REG_INFO(26));
PrintF("%3s,%3s: 0x%08x%08x %16.4e\n", FPU_REG_INFO(28));
PrintF("%3s,%3s: 0x%08x%08x %16.4e\n", FPU_REG_INFO(30));
#undef REG_INFO
#undef FPU_REG_INFO
}
void MipsDebugger::Debug() {
intptr_t last_pc = -1;
bool done = false;
#define COMMAND_SIZE 63
#define ARG_SIZE 255
#define STR(a) #a
#define XSTR(a) STR(a)
char cmd[COMMAND_SIZE + 1];
char arg1[ARG_SIZE + 1];
char arg2[ARG_SIZE + 1];
char* argv[3] = { cmd, arg1, arg2 };
// Make sure to have a proper terminating character if reaching the limit.
cmd[COMMAND_SIZE] = 0;
arg1[ARG_SIZE] = 0;
arg2[ARG_SIZE] = 0;
// Undo all set breakpoints while running in the debugger shell. This will
// make them invisible to all commands.
UndoBreakpoints();
while (!done && (sim_->get_pc() != Simulator::end_sim_pc)) {
if (last_pc != sim_->get_pc()) {
disasm::NameConverter converter;
disasm::Disassembler dasm(converter);
// Use a reasonably large buffer.
v8::internal::EmbeddedVector<char, 256> buffer;
dasm.InstructionDecode(buffer,
reinterpret_cast<byte*>(sim_->get_pc()));
PrintF(" 0x%08x %s\n", sim_->get_pc(), buffer.start());
last_pc = sim_->get_pc();
}
char* line = ReadLine("sim> ");
if (line == NULL) {
break;
} else {
char* last_input = sim_->last_debugger_input();
if (strcmp(line, "\n") == 0 && last_input != NULL) {
line = last_input;
} else {
// Ownership is transferred to sim_;
sim_->set_last_debugger_input(line);
}
// Use sscanf to parse the individual parts of the command line. At the
// moment no command expects more than two parameters.
int argc = SScanF(line,
"%" XSTR(COMMAND_SIZE) "s "
"%" XSTR(ARG_SIZE) "s "
"%" XSTR(ARG_SIZE) "s",
cmd, arg1, arg2);
if ((strcmp(cmd, "si") == 0) || (strcmp(cmd, "stepi") == 0)) {
Instruction* instr = reinterpret_cast<Instruction*>(sim_->get_pc());
if (!(instr->IsTrap()) ||
instr->InstructionBits() == rtCallRedirInstr) {
sim_->InstructionDecode(
reinterpret_cast<Instruction*>(sim_->get_pc()));
} else {
// Allow si to jump over generated breakpoints.
PrintF("/!\\ Jumping over generated breakpoint.\n");
sim_->set_pc(sim_->get_pc() + Instruction::kInstrSize);
}
} else if ((strcmp(cmd, "c") == 0) || (strcmp(cmd, "cont") == 0)) {
// Execute the one instruction we broke at with breakpoints disabled.
sim_->InstructionDecode(reinterpret_cast<Instruction*>(sim_->get_pc()));
// Leave the debugger shell.
done = true;
} else if ((strcmp(cmd, "p") == 0) || (strcmp(cmd, "print") == 0)) {
if (argc == 2) {
int32_t value;
float fvalue;
if (strcmp(arg1, "all") == 0) {
PrintAllRegs();
} else if (strcmp(arg1, "allf") == 0) {
PrintAllRegsIncludingFPU();
} else {
int regnum = Registers::Number(arg1);
int fpuregnum = FPURegisters::Number(arg1);
if (regnum != kInvalidRegister) {
value = GetRegisterValue(regnum);
PrintF("%s: 0x%08x %d \n", arg1, value, value);
} else if (fpuregnum != kInvalidFPURegister) {
if (fpuregnum % 2 == 1) {
value = GetFPURegisterValueInt(fpuregnum);
fvalue = GetFPURegisterValueFloat(fpuregnum);
PrintF("%s: 0x%08x %11.4e\n", arg1, value, fvalue);
} else {
double dfvalue;
int32_t lvalue1 = GetFPURegisterValueInt(fpuregnum);
int32_t lvalue2 = GetFPURegisterValueInt(fpuregnum + 1);
dfvalue = GetFPURegisterValueDouble(fpuregnum);
PrintF("%3s,%3s: 0x%08x%08x %16.4e\n",
FPURegisters::Name(fpuregnum+1),
FPURegisters::Name(fpuregnum),
lvalue1,
lvalue2,
dfvalue);
}
} else {
PrintF("%s unrecognized\n", arg1);
}
}
} else {
if (argc == 3) {
if (strcmp(arg2, "single") == 0) {
int32_t value;
float fvalue;
int fpuregnum = FPURegisters::Number(arg1);
if (fpuregnum != kInvalidFPURegister) {
value = GetFPURegisterValueInt(fpuregnum);
fvalue = GetFPURegisterValueFloat(fpuregnum);
PrintF("%s: 0x%08x %11.4e\n", arg1, value, fvalue);
} else {
PrintF("%s unrecognized\n", arg1);
}
} else {
PrintF("print <fpu register> single\n");
}
} else {
PrintF("print <register> or print <fpu register> single\n");
}
}
} else if ((strcmp(cmd, "po") == 0)
|| (strcmp(cmd, "printobject") == 0)) {
if (argc == 2) {
int32_t value;
if (GetValue(arg1, &value)) {
Object* obj = reinterpret_cast<Object*>(value);
PrintF("%s: \n", arg1);
#ifdef DEBUG
obj->PrintLn();
#else
obj->ShortPrint();
PrintF("\n");
#endif
} else {
PrintF("%s unrecognized\n", arg1);
}
} else {
PrintF("printobject <value>\n");
}
} else if (strcmp(cmd, "stack") == 0 || strcmp(cmd, "mem") == 0) {
int32_t* cur = NULL;
int32_t* end = NULL;
int next_arg = 1;
if (strcmp(cmd, "stack") == 0) {
cur = reinterpret_cast<int32_t*>(sim_->get_register(Simulator::sp));
} else { // Command "mem".
int32_t value;
if (!GetValue(arg1, &value)) {
PrintF("%s unrecognized\n", arg1);
continue;
}
cur = reinterpret_cast<int32_t*>(value);
next_arg++;
}
int32_t words;
if (argc == next_arg) {
words = 10;
} else {
if (!GetValue(argv[next_arg], &words)) {
words = 10;
}
}
end = cur + words;
while (cur < end) {
PrintF(" 0x%08x: 0x%08x %10d",
reinterpret_cast<intptr_t>(cur), *cur, *cur);
HeapObject* obj = reinterpret_cast<HeapObject*>(*cur);
int value = *cur;
Heap* current_heap = v8::internal::Isolate::Current()->heap();
if (((value & 1) == 0) || current_heap->Contains(obj)) {
PrintF(" (");
if ((value & 1) == 0) {
PrintF("smi %d", value / 2);
} else {
obj->ShortPrint();
}
PrintF(")");
}
PrintF("\n");
cur++;
}
} else if ((strcmp(cmd, "disasm") == 0) ||
(strcmp(cmd, "dpc") == 0) ||
(strcmp(cmd, "di") == 0)) {
disasm::NameConverter converter;
disasm::Disassembler dasm(converter);
// Use a reasonably large buffer.
v8::internal::EmbeddedVector<char, 256> buffer;
byte* cur = NULL;
byte* end = NULL;
if (argc == 1) {
cur = reinterpret_cast<byte*>(sim_->get_pc());
end = cur + (10 * Instruction::kInstrSize);
} else if (argc == 2) {
int regnum = Registers::Number(arg1);
if (regnum != kInvalidRegister || strncmp(arg1, "0x", 2) == 0) {
// The argument is an address or a register name.
int32_t value;
if (GetValue(arg1, &value)) {
cur = reinterpret_cast<byte*>(value);
// Disassemble 10 instructions at <arg1>.
end = cur + (10 * Instruction::kInstrSize);
}
} else {
// The argument is the number of instructions.
int32_t value;
if (GetValue(arg1, &value)) {
cur = reinterpret_cast<byte*>(sim_->get_pc());
// Disassemble <arg1> instructions.
end = cur + (value * Instruction::kInstrSize);
}
}
} else {
int32_t value1;
int32_t value2;
if (GetValue(arg1, &value1) && GetValue(arg2, &value2)) {
cur = reinterpret_cast<byte*>(value1);
end = cur + (value2 * Instruction::kInstrSize);
}
}
while (cur < end) {
dasm.InstructionDecode(buffer, cur);
PrintF(" 0x%08x %s\n",
reinterpret_cast<intptr_t>(cur), buffer.start());
cur += Instruction::kInstrSize;
}
} else if (strcmp(cmd, "gdb") == 0) {
PrintF("relinquishing control to gdb\n");
v8::base::OS::DebugBreak();
PrintF("regaining control from gdb\n");
} else if (strcmp(cmd, "break") == 0) {
if (argc == 2) {
int32_t value;
if (GetValue(arg1, &value)) {
if (!SetBreakpoint(reinterpret_cast<Instruction*>(value))) {
PrintF("setting breakpoint failed\n");
}
} else {
PrintF("%s unrecognized\n", arg1);
}
} else {
PrintF("break <address>\n");
}
} else if (strcmp(cmd, "del") == 0) {
if (!DeleteBreakpoint(NULL)) {
PrintF("deleting breakpoint failed\n");
}
} else if (strcmp(cmd, "flags") == 0) {
PrintF("No flags on MIPS !\n");
} else if (strcmp(cmd, "stop") == 0) {
int32_t value;
intptr_t stop_pc = sim_->get_pc() -
2 * Instruction::kInstrSize;
Instruction* stop_instr = reinterpret_cast<Instruction*>(stop_pc);
Instruction* msg_address =
reinterpret_cast<Instruction*>(stop_pc +
Instruction::kInstrSize);
if ((argc == 2) && (strcmp(arg1, "unstop") == 0)) {
// Remove the current stop.
if (sim_->IsStopInstruction(stop_instr)) {
stop_instr->SetInstructionBits(kNopInstr);
msg_address->SetInstructionBits(kNopInstr);
} else {
PrintF("Not at debugger stop.\n");
}
} else if (argc == 3) {
// Print information about all/the specified breakpoint(s).
if (strcmp(arg1, "info") == 0) {
if (strcmp(arg2, "all") == 0) {
PrintF("Stop information:\n");
for (uint32_t i = kMaxWatchpointCode + 1;
i <= kMaxStopCode;
i++) {
sim_->PrintStopInfo(i);
}
} else if (GetValue(arg2, &value)) {
sim_->PrintStopInfo(value);
} else {
PrintF("Unrecognized argument.\n");
}
} else if (strcmp(arg1, "enable") == 0) {
// Enable all/the specified breakpoint(s).
if (strcmp(arg2, "all") == 0) {
for (uint32_t i = kMaxWatchpointCode + 1;
i <= kMaxStopCode;
i++) {
sim_->EnableStop(i);
}
} else if (GetValue(arg2, &value)) {
sim_->EnableStop(value);
} else {
PrintF("Unrecognized argument.\n");
}
} else if (strcmp(arg1, "disable") == 0) {
// Disable all/the specified breakpoint(s).
if (strcmp(arg2, "all") == 0) {
for (uint32_t i = kMaxWatchpointCode + 1;
i <= kMaxStopCode;
i++) {
sim_->DisableStop(i);
}
} else if (GetValue(arg2, &value)) {
sim_->DisableStop(value);
} else {
PrintF("Unrecognized argument.\n");
}
}
} else {
PrintF("Wrong usage. Use help command for more information.\n");
}
} else if ((strcmp(cmd, "stat") == 0) || (strcmp(cmd, "st") == 0)) {
// Print registers and disassemble.
PrintAllRegs();
PrintF("\n");
disasm::NameConverter converter;
disasm::Disassembler dasm(converter);
// Use a reasonably large buffer.
v8::internal::EmbeddedVector<char, 256> buffer;
byte* cur = NULL;
byte* end = NULL;
if (argc == 1) {
cur = reinterpret_cast<byte*>(sim_->get_pc());
end = cur + (10 * Instruction::kInstrSize);
} else if (argc == 2) {
int32_t value;
if (GetValue(arg1, &value)) {
cur = reinterpret_cast<byte*>(value);
// no length parameter passed, assume 10 instructions
end = cur + (10 * Instruction::kInstrSize);
}
} else {
int32_t value1;
int32_t value2;
if (GetValue(arg1, &value1) && GetValue(arg2, &value2)) {
cur = reinterpret_cast<byte*>(value1);
end = cur + (value2 * Instruction::kInstrSize);
}
}
while (cur < end) {
dasm.InstructionDecode(buffer, cur);
PrintF(" 0x%08x %s\n",
reinterpret_cast<intptr_t>(cur), buffer.start());
cur += Instruction::kInstrSize;
}
} else if ((strcmp(cmd, "h") == 0) || (strcmp(cmd, "help") == 0)) {
PrintF("cont\n");
PrintF(" continue execution (alias 'c')\n");
PrintF("stepi\n");
PrintF(" step one instruction (alias 'si')\n");
PrintF("print <register>\n");
PrintF(" print register content (alias 'p')\n");
PrintF(" use register name 'all' to print all registers\n");
PrintF("printobject <register>\n");
PrintF(" print an object from a register (alias 'po')\n");
PrintF("stack [<words>]\n");
PrintF(" dump stack content, default dump 10 words)\n");
PrintF("mem <address> [<words>]\n");
PrintF(" dump memory content, default dump 10 words)\n");
PrintF("flags\n");
PrintF(" print flags\n");
PrintF("disasm [<instructions>]\n");
PrintF("disasm [<address/register>]\n");
PrintF("disasm [[<address/register>] <instructions>]\n");
PrintF(" disassemble code, default is 10 instructions\n");
PrintF(" from pc (alias 'di')\n");
PrintF("gdb\n");
PrintF(" enter gdb\n");
PrintF("break <address>\n");
PrintF(" set a break point on the address\n");
PrintF("del\n");
PrintF(" delete the breakpoint\n");
PrintF("stop feature:\n");
PrintF(" Description:\n");
PrintF(" Stops are debug instructions inserted by\n");
PrintF(" the Assembler::stop() function.\n");
PrintF(" When hitting a stop, the Simulator will\n");
PrintF(" stop and and give control to the Debugger.\n");
PrintF(" All stop codes are watched:\n");
PrintF(" - They can be enabled / disabled: the Simulator\n");
PrintF(" will / won't stop when hitting them.\n");
PrintF(" - The Simulator keeps track of how many times they \n");
PrintF(" are met. (See the info command.) Going over a\n");
PrintF(" disabled stop still increases its counter. \n");
PrintF(" Commands:\n");
PrintF(" stop info all/<code> : print infos about number <code>\n");
PrintF(" or all stop(s).\n");
PrintF(" stop enable/disable all/<code> : enables / disables\n");
PrintF(" all or number <code> stop(s)\n");
PrintF(" stop unstop\n");
PrintF(" ignore the stop instruction at the current location\n");
PrintF(" from now on\n");
} else {
PrintF("Unknown command: %s\n", cmd);
}
}
}
// Add all the breakpoints back to stop execution and enter the debugger
// shell when hit.
RedoBreakpoints();
#undef COMMAND_SIZE
#undef ARG_SIZE
#undef STR
#undef XSTR
}
static bool ICacheMatch(void* one, void* two) {
ASSERT((reinterpret_cast<intptr_t>(one) & CachePage::kPageMask) == 0);
ASSERT((reinterpret_cast<intptr_t>(two) & CachePage::kPageMask) == 0);
return one == two;
}
static uint32_t ICacheHash(void* key) {
return static_cast<uint32_t>(reinterpret_cast<uintptr_t>(key)) >> 2;
}
static bool AllOnOnePage(uintptr_t start, int size) {
intptr_t start_page = (start & ~CachePage::kPageMask);
intptr_t end_page = ((start + size) & ~CachePage::kPageMask);
return start_page == end_page;
}
void Simulator::set_last_debugger_input(char* input) {
DeleteArray(last_debugger_input_);
last_debugger_input_ = input;
}
void Simulator::FlushICache(v8::internal::HashMap* i_cache,
void* start_addr,
size_t size) {
intptr_t start = reinterpret_cast<intptr_t>(start_addr);
int intra_line = (start & CachePage::kLineMask);
start -= intra_line;
size += intra_line;
size = ((size - 1) | CachePage::kLineMask) + 1;
int offset = (start & CachePage::kPageMask);
while (!AllOnOnePage(start, size - 1)) {
int bytes_to_flush = CachePage::kPageSize - offset;
FlushOnePage(i_cache, start, bytes_to_flush);
start += bytes_to_flush;
size -= bytes_to_flush;
ASSERT_EQ(0, start & CachePage::kPageMask);
offset = 0;
}
if (size != 0) {
FlushOnePage(i_cache, start, size);
}
}
CachePage* Simulator::GetCachePage(v8::internal::HashMap* i_cache, void* page) {
v8::internal::HashMap::Entry* entry = i_cache->Lookup(page,
ICacheHash(page),
true);
if (entry->value == NULL) {
CachePage* new_page = new CachePage();
entry->value = new_page;
}
return reinterpret_cast<CachePage*>(entry->value);
}
// Flush from start up to and not including start + size.
void Simulator::FlushOnePage(v8::internal::HashMap* i_cache,
intptr_t start,
int size) {
ASSERT(size <= CachePage::kPageSize);
ASSERT(AllOnOnePage(start, size - 1));
ASSERT((start & CachePage::kLineMask) == 0);
ASSERT((size & CachePage::kLineMask) == 0);
void* page = reinterpret_cast<void*>(start & (~CachePage::kPageMask));
int offset = (start & CachePage::kPageMask);
CachePage* cache_page = GetCachePage(i_cache, page);
char* valid_bytemap = cache_page->ValidityByte(offset);
memset(valid_bytemap, CachePage::LINE_INVALID, size >> CachePage::kLineShift);
}
void Simulator::CheckICache(v8::internal::HashMap* i_cache,
Instruction* instr) {
intptr_t address = reinterpret_cast<intptr_t>(instr);
void* page = reinterpret_cast<void*>(address & (~CachePage::kPageMask));
void* line = reinterpret_cast<void*>(address & (~CachePage::kLineMask));
int offset = (address & CachePage::kPageMask);
CachePage* cache_page = GetCachePage(i_cache, page);
char* cache_valid_byte = cache_page->ValidityByte(offset);
bool cache_hit = (*cache_valid_byte == CachePage::LINE_VALID);
char* cached_line = cache_page->CachedData(offset & ~CachePage::kLineMask);
if (cache_hit) {
// Check that the data in memory matches the contents of the I-cache.
CHECK_EQ(0, memcmp(reinterpret_cast<void*>(instr),
cache_page->CachedData(offset),
Instruction::kInstrSize));
} else {
// Cache miss. Load memory into the cache.
memcpy(cached_line, line, CachePage::kLineLength);
*cache_valid_byte = CachePage::LINE_VALID;
}
}
void Simulator::Initialize(Isolate* isolate) {
if (isolate->simulator_initialized()) return;
isolate->set_simulator_initialized(true);
::v8::internal::ExternalReference::set_redirector(isolate,
&RedirectExternalReference);
}
Simulator::Simulator(Isolate* isolate) : isolate_(isolate) {
i_cache_ = isolate_->simulator_i_cache();
if (i_cache_ == NULL) {
i_cache_ = new v8::internal::HashMap(&ICacheMatch);
isolate_->set_simulator_i_cache(i_cache_);
}
Initialize(isolate);
// Set up simulator support first. Some of this information is needed to
// setup the architecture state.
stack_ = reinterpret_cast<char*>(malloc(stack_size_));
pc_modified_ = false;
icount_ = 0;
break_count_ = 0;
break_pc_ = NULL;
break_instr_ = 0;
// Set up architecture state.
// All registers are initialized to zero to start with.
for (int i = 0; i < kNumSimuRegisters; i++) {
registers_[i] = 0;
}
for (int i = 0; i < kNumFPURegisters; i++) {
FPUregisters_[i] = 0;
}
FCSR_ = 0;
// The sp is initialized to point to the bottom (high address) of the
// allocated stack area. To be safe in potential stack underflows we leave
// some buffer below.
registers_[sp] = reinterpret_cast<int32_t>(stack_) + stack_size_ - 64;
// The ra and pc are initialized to a known bad value that will cause an
// access violation if the simulator ever tries to execute it.
registers_[pc] = bad_ra;
registers_[ra] = bad_ra;
InitializeCoverage();
for (int i = 0; i < kNumExceptions; i++) {
exceptions[i] = 0;
}
last_debugger_input_ = NULL;
}
Simulator::~Simulator() {
}
// When the generated code calls an external reference we need to catch that in
// the simulator. The external reference will be a function compiled for the
// host architecture. We need to call that function instead of trying to
// execute it with the simulator. We do that by redirecting the external
// reference to a swi (software-interrupt) instruction that is handled by
// the simulator. We write the original destination of the jump just at a known
// offset from the swi instruction so the simulator knows what to call.
class Redirection {
public:
Redirection(void* external_function, ExternalReference::Type type)
: external_function_(external_function),
swi_instruction_(rtCallRedirInstr),
type_(type),
next_(NULL) {
Isolate* isolate = Isolate::Current();
next_ = isolate->simulator_redirection();
Simulator::current(isolate)->
FlushICache(isolate->simulator_i_cache(),
reinterpret_cast<void*>(&swi_instruction_),
Instruction::kInstrSize);
isolate->set_simulator_redirection(this);
}
void* address_of_swi_instruction() {
return reinterpret_cast<void*>(&swi_instruction_);
}
void* external_function() { return external_function_; }
ExternalReference::Type type() { return type_; }
static Redirection* Get(void* external_function,
ExternalReference::Type type) {
Isolate* isolate = Isolate::Current();
Redirection* current = isolate->simulator_redirection();
for (; current != NULL; current = current->next_) {
if (current->external_function_ == external_function) return current;
}
return new Redirection(external_function, type);
}
static Redirection* FromSwiInstruction(Instruction* swi_instruction) {
char* addr_of_swi = reinterpret_cast<char*>(swi_instruction);
char* addr_of_redirection =
addr_of_swi - OFFSET_OF(Redirection, swi_instruction_);
return reinterpret_cast<Redirection*>(addr_of_redirection);
}
static void* ReverseRedirection(int32_t reg) {
Redirection* redirection = FromSwiInstruction(
reinterpret_cast<Instruction*>(reinterpret_cast<void*>(reg)));
return redirection->external_function();
}
private:
void* external_function_;
uint32_t swi_instruction_;
ExternalReference::Type type_;
Redirection* next_;
};
void* Simulator::RedirectExternalReference(void* external_function,
ExternalReference::Type type) {
Redirection* redirection = Redirection::Get(external_function, type);
return redirection->address_of_swi_instruction();
}
// Get the active Simulator for the current thread.
Simulator* Simulator::current(Isolate* isolate) {
v8::internal::Isolate::PerIsolateThreadData* isolate_data =
isolate->FindOrAllocatePerThreadDataForThisThread();
ASSERT(isolate_data != NULL);
ASSERT(isolate_data != NULL);
Simulator* sim = isolate_data->simulator();
if (sim == NULL) {
// TODO(146): delete the simulator object when a thread/isolate goes away.
sim = new Simulator(isolate);
isolate_data->set_simulator(sim);
}
return sim;
}
// Sets the register in the architecture state. It will also deal with updating
// Simulator internal state for special registers such as PC.
void Simulator::set_register(int reg, int32_t value) {
ASSERT((reg >= 0) && (reg < kNumSimuRegisters));
if (reg == pc) {
pc_modified_ = true;
}