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Commit 7c5e99c0 authored by Leszek Swirski's avatar Leszek Swirski Committed by Commit Bot
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[arm/sim] Add 'sim' gdb command and backtrace command 

Port the recent arm64 simulator debugger improvements to arm:

  * [arm64/sim] Add a 'sim' gdb command
    https://crrev.com/c/2664448
  * [arm64/sim] Add a simple backtrace debug command
    https://crrev.com/c/2666688

Change-Id: Id58a49cfe8e643be0fb6718a0a149e2c7ea0bcaa
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2844659
Commit-Queue: Leszek Swirski <leszeks@chromium.org>
Commit-Queue: Dan Elphick <delphick@chromium.org>
Auto-Submit: Leszek Swirski <leszeks@chromium.org>
Reviewed-by: 's avatarDan Elphick <delphick@chromium.org>
Cr-Commit-Position: refs/heads/master@{#74123}
parent fb51aa40
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Showing with 377 additions and 326 deletions
src/execution/arm/simulator-arm.cc
View file @ 7c5e99c0
......@@ -50,6 +50,7 @@ class ArmDebugger {
public:
explicit ArmDebugger(Simulator* sim) : sim_(sim) {}
void Debug();
bool ExecDebugCommand(ArrayUniquePtr<char> line_ptr);
private:
static const Instr kBreakpointInstr =
......@@ -191,6 +192,31 @@ void ArmDebugger::Debug() {
intptr_t last_pc = -1;
bool done = false;
// Unset breakpoint while running in the debugger shell, making it invisible
// to all commands.
UndoBreakpoint();
while (!done && !sim_->has_bad_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.begin());
last_pc = sim_->get_pc();
}
ArrayUniquePtr<char> line(ReadLine("sim> "));
done = ExecDebugCommand(std::move(line));
}
// Reinstall breakpoint to stop execution and enter the debugger shell when
// hit.
RedoBreakpoint();
}
bool ArmDebugger::ExecDebugCommand(ArrayUniquePtr<char> line_ptr) {
#define COMMAND_SIZE 63
#define ARG_SIZE 255
......@@ -207,352 +233,357 @@ void ArmDebugger::Debug() {
arg1[ARG_SIZE] = 0;
arg2[ARG_SIZE] = 0;
// Unset breakpoint while running in the debugger shell, making it invisible
// to all commands.
UndoBreakpoint();
if (line_ptr == nullptr) return true;
while (!done && !sim_->has_bad_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.begin());
last_pc = sim_->get_pc();
}
char* line = ReadLine("sim> ");
if (line == nullptr) {
break;
} else {
char* last_input = sim_->last_debugger_input();
if (strcmp(line, "\n") == 0 && last_input != nullptr) {
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)) {
sim_->InstructionDecode(reinterpret_cast<Instruction*>(sim_->get_pc()));
} 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 || (argc == 3 && strcmp(arg2, "fp") == 0)) {
int32_t value;
float svalue;
double dvalue;
if (strcmp(arg1, "all") == 0) {
for (int i = 0; i < kNumRegisters; i++) {
value = GetRegisterValue(i);
PrintF("%3s: 0x%08x %10d", RegisterName(Register::from_code(i)),
value, value);
if ((argc == 3 && strcmp(arg2, "fp") == 0) && i < 8 &&
(i % 2) == 0) {
dvalue = GetRegisterPairDoubleValue(i);
PrintF(" (%f)\n", dvalue);
} else {
PrintF("\n");
}
}
for (int i = 0; i < DwVfpRegister::SupportedRegisterCount(); i++) {
dvalue = GetVFPDoubleRegisterValue(i);
uint64_t as_words = bit_cast<uint64_t>(dvalue);
PrintF("%3s: %f 0x%08x %08x\n", VFPRegisters::Name(i, true),
dvalue, static_cast<uint32_t>(as_words >> 32),
static_cast<uint32_t>(as_words & 0xFFFFFFFF));
}
// Repeat last command by default.
const char* line = line_ptr.get();
const char* last_input = sim_->last_debugger_input();
if (strcmp(line, "\n") == 0 && (last_input != nullptr)) {
line_ptr.reset();
line = last_input;
} else {
// Update the latest command ran
sim_->set_last_debugger_input(std::move(line_ptr));
}
// 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)) {
sim_->InstructionDecode(reinterpret_cast<Instruction*>(sim_->get_pc()));
} 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.
return true;
} else if ((strcmp(cmd, "p") == 0) || (strcmp(cmd, "print") == 0)) {
if (argc == 2 || (argc == 3 && strcmp(arg2, "fp") == 0)) {
int32_t value;
float svalue;
double dvalue;
if (strcmp(arg1, "all") == 0) {
for (int i = 0; i < kNumRegisters; i++) {
value = GetRegisterValue(i);
PrintF("%3s: 0x%08x %10d", RegisterName(Register::from_code(i)),
value, value);
if ((argc == 3 && strcmp(arg2, "fp") == 0) && i < 8 && (i % 2) == 0) {
dvalue = GetRegisterPairDoubleValue(i);
PrintF(" (%f)\n", dvalue);
} else {
if (GetValue(arg1, &value)) {
PrintF("%s: 0x%08x %d \n", arg1, value, value);
} else if (GetVFPSingleValue(arg1, &svalue)) {
uint32_t as_word = bit_cast<uint32_t>(svalue);
PrintF("%s: %f 0x%08x\n", arg1, svalue, as_word);
} else if (GetVFPDoubleValue(arg1, &dvalue)) {
uint64_t as_words = bit_cast<uint64_t>(dvalue);
PrintF("%s: %f 0x%08x %08x\n", arg1, dvalue,
static_cast<uint32_t>(as_words >> 32),
static_cast<uint32_t>(as_words & 0xFFFFFFFF));
} else {
PrintF("%s unrecognized\n", arg1);
}
PrintF("\n");
}
}
for (int i = 0; i < DwVfpRegister::SupportedRegisterCount(); i++) {
dvalue = GetVFPDoubleRegisterValue(i);
uint64_t as_words = bit_cast<uint64_t>(dvalue);
PrintF("%3s: %f 0x%08x %08x\n", VFPRegisters::Name(i, true), dvalue,
static_cast<uint32_t>(as_words >> 32),
static_cast<uint32_t>(as_words & 0xFFFFFFFF));
}
} else {
if (GetValue(arg1, &value)) {
PrintF("%s: 0x%08x %d \n", arg1, value, value);
} else if (GetVFPSingleValue(arg1, &svalue)) {
uint32_t as_word = bit_cast<uint32_t>(svalue);
PrintF("%s: %f 0x%08x\n", arg1, svalue, as_word);
} else if (GetVFPDoubleValue(arg1, &dvalue)) {
uint64_t as_words = bit_cast<uint64_t>(dvalue);
PrintF("%s: %f 0x%08x %08x\n", arg1, dvalue,
static_cast<uint32_t>(as_words >> 32),
static_cast<uint32_t>(as_words & 0xFFFFFFFF));
} else {
PrintF("print <register>\n");
PrintF("%s unrecognized\n", arg1);
}
} else if ((strcmp(cmd, "po") == 0) ||
(strcmp(cmd, "printobject") == 0)) {
if (argc == 2) {
int32_t value;
StdoutStream os;
if (GetValue(arg1, &value)) {
Object obj(value);
os << arg1 << ": \n";
}
} else {
PrintF("print <register>\n");
}
} else if ((strcmp(cmd, "po") == 0) || (strcmp(cmd, "printobject") == 0)) {
if (argc == 2) {
int32_t value;
StdoutStream os;
if (GetValue(arg1, &value)) {
Object obj(value);
os << arg1 << ": \n";
#ifdef DEBUG
obj.Print(os);
os << "\n";
obj.Print(os);
os << "\n";
#else
os << Brief(obj) << "\n";
os << Brief(obj) << "\n";
#endif
} else {
os << arg1 << " unrecognized\n";
}
} else {
PrintF("printobject <value>\n");
}
} else if (strcmp(cmd, "stack") == 0 || strcmp(cmd, "mem") == 0 ||
strcmp(cmd, "dump") == 0) {
int32_t* cur = nullptr;
int32_t* end = nullptr;
int next_arg = 1;
if (strcmp(cmd, "stack") == 0) {
cur = reinterpret_cast<int32_t*>(sim_->get_register(Simulator::sp));
} else { // "mem"
int32_t value;
if (!GetValue(arg1, &value)) {
PrintF("%s unrecognized\n", arg1);
return false;
}
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;
bool skip_obj_print = (strcmp(cmd, "dump") == 0);
while (cur < end) {
PrintF(" 0x%08" V8PRIxPTR ": 0x%08x %10d",
reinterpret_cast<intptr_t>(cur), *cur, *cur);
Object obj(*cur);
Heap* current_heap = sim_->isolate_->heap();
if (!skip_obj_print) {
if (obj.IsSmi() ||
IsValidHeapObject(current_heap, HeapObject::cast(obj))) {
PrintF(" (");
if (obj.IsSmi()) {
PrintF("smi %d", Smi::ToInt(obj));
} else {
os << arg1 << " unrecognized\n";
}
} else {
PrintF("printobject <value>\n");
}
} else if (strcmp(cmd, "stack") == 0 || strcmp(cmd, "mem") == 0 ||
strcmp(cmd, "dump") == 0) {
int32_t* cur = nullptr;
int32_t* end = nullptr;
int next_arg = 1;
if (strcmp(cmd, "stack") == 0) {
cur = reinterpret_cast<int32_t*>(sim_->get_register(Simulator::sp));
} else { // "mem"
int32_t value;
if (!GetValue(arg1, &value)) {
PrintF("%s unrecognized\n", arg1);
continue;
obj.ShortPrint();
}
cur = reinterpret_cast<int32_t*>(value);
next_arg++;
PrintF(")");
}
}
PrintF("\n");
cur++;
}
} else if (strcmp(cmd, "disasm") == 0 || strcmp(cmd, "di") == 0) {
disasm::NameConverter converter;
disasm::Disassembler dasm(converter);
// use a reasonably large buffer
v8::internal::EmbeddedVector<char, 256> buffer;
int32_t words;
if (argc == next_arg) {
words = 10;
} else {
if (!GetValue(argv[next_arg], &words)) {
words = 10;
}
byte* prev = nullptr;
byte* cur = nullptr;
byte* end = nullptr;
if (argc == 1) {
cur = reinterpret_cast<byte*>(sim_->get_pc());
end = cur + (10 * kInstrSize);
} else if (argc == 2) {
int regnum = Registers::Number(arg1);
if (regnum != kNoRegister || 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 * kInstrSize);
}
end = cur + words;
bool skip_obj_print = (strcmp(cmd, "dump") == 0);
while (cur < end) {
PrintF(" 0x%08" V8PRIxPTR ": 0x%08x %10d",
reinterpret_cast<intptr_t>(cur), *cur, *cur);
Object obj(*cur);
Heap* current_heap = sim_->isolate_->heap();
if (!skip_obj_print) {
if (obj.IsSmi() ||
IsValidHeapObject(current_heap, HeapObject::cast(obj))) {
PrintF(" (");
if (obj.IsSmi()) {
PrintF("smi %d", Smi::ToInt(obj));
} else {
obj.ShortPrint();
}
PrintF(")");
}
}
PrintF("\n");
cur++;
} 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 * kInstrSize);
}
} else if (strcmp(cmd, "disasm") == 0 || strcmp(cmd, "di") == 0) {
disasm::NameConverter converter;
disasm::Disassembler dasm(converter);
// use a reasonably large buffer
v8::internal::EmbeddedVector<char, 256> buffer;
}
} else {
int32_t value1;
int32_t value2;
if (GetValue(arg1, &value1) && GetValue(arg2, &value2)) {
cur = reinterpret_cast<byte*>(value1);
end = cur + (value2 * kInstrSize);
}
}
byte* prev = nullptr;
byte* cur = nullptr;
byte* end = nullptr;
while (cur < end) {
prev = cur;
cur += dasm.InstructionDecode(buffer, cur);
PrintF(" 0x%08" V8PRIxPTR " %s\n", reinterpret_cast<intptr_t>(prev),
buffer.begin());
}
} 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, "backtrace") == 0 || strcmp(cmd, "bt") == 0) {
int32_t pc = sim_->get_pc();
int32_t lr = sim_->get_register(Simulator::lr);
int32_t sp = sim_->get_register(Simulator::sp);
int32_t fp = sim_->get_register(Simulator::fp);
if (argc == 1) {
cur = reinterpret_cast<byte*>(sim_->get_pc());
end = cur + (10 * kInstrSize);
} else if (argc == 2) {
int regnum = Registers::Number(arg1);
if (regnum != kNoRegister || 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 * 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 * kInstrSize);
}
int i = 0;
while (true) {
PrintF("#%d: 0x%08x (sp=0x%08x, fp=0x%08x)\n", i, pc, sp, fp);
pc = lr;
sp = fp;
if (pc == Simulator::end_sim_pc) {
break;
}
lr = *(reinterpret_cast<int32_t*>(fp) + 1);
fp = *reinterpret_cast<int32_t*>(fp);
i++;
if (i > 100) {
PrintF("Too many frames\n");
break;
}
}
} else if (strcmp(cmd, "del") == 0) {
DeleteBreakpoint();
} else if (strcmp(cmd, "flags") == 0) {
PrintF("N flag: %d; ", sim_->n_flag_);
PrintF("Z flag: %d; ", sim_->z_flag_);
PrintF("C flag: %d; ", sim_->c_flag_);
PrintF("V flag: %d\n", sim_->v_flag_);
PrintF("INVALID OP flag: %d; ", sim_->inv_op_vfp_flag_);
PrintF("DIV BY ZERO flag: %d; ", sim_->div_zero_vfp_flag_);
PrintF("OVERFLOW flag: %d; ", sim_->overflow_vfp_flag_);
PrintF("UNDERFLOW flag: %d; ", sim_->underflow_vfp_flag_);
PrintF("INEXACT flag: %d;\n", sim_->inexact_vfp_flag_);
} else if (strcmp(cmd, "stop") == 0) {
int32_t value;
intptr_t stop_pc = sim_->get_pc() - kInstrSize;
Instruction* stop_instr = reinterpret_cast<Instruction*>(stop_pc);
if ((argc == 2) && (strcmp(arg1, "unstop") == 0)) {
// Remove the current stop.
if (stop_instr->IsStop()) {
SetInstructionBitsInCodeSpace(stop_instr, kNopInstr,
sim_->isolate_->heap());
} 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 = 0; i < sim_->kNumOfWatchedStops; i++) {
sim_->PrintStopInfo(i);
}
} else if (GetValue(arg2, &value)) {
sim_->PrintStopInfo(value);
} else {
int32_t value1;
int32_t value2;
if (GetValue(arg1, &value1) && GetValue(arg2, &value2)) {
cur = reinterpret_cast<byte*>(value1);
end = cur + (value2 * kInstrSize);
}
PrintF("Unrecognized argument.\n");
}
while (cur < end) {
prev = cur;
cur += dasm.InstructionDecode(buffer, cur);
PrintF(" 0x%08" V8PRIxPTR " %s\n", reinterpret_cast<intptr_t>(prev),
buffer.begin());
}
} 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 if (strcmp(arg1, "enable") == 0) {
// Enable all/the specified breakpoint(s).
if (strcmp(arg2, "all") == 0) {
for (uint32_t i = 0; i < sim_->kNumOfWatchedStops; i++) {
sim_->EnableStop(i);
}
} else if (GetValue(arg2, &value)) {
sim_->EnableStop(value);
} else {
PrintF("break <address>\n");
PrintF("Unrecognized argument.\n");
}
} else if (strcmp(cmd, "del") == 0) {
DeleteBreakpoint();
} else if (strcmp(cmd, "flags") == 0) {
PrintF("N flag: %d; ", sim_->n_flag_);
PrintF("Z flag: %d; ", sim_->z_flag_);
PrintF("C flag: %d; ", sim_->c_flag_);
PrintF("V flag: %d\n", sim_->v_flag_);
PrintF("INVALID OP flag: %d; ", sim_->inv_op_vfp_flag_);
PrintF("DIV BY ZERO flag: %d; ", sim_->div_zero_vfp_flag_);
PrintF("OVERFLOW flag: %d; ", sim_->overflow_vfp_flag_);
PrintF("UNDERFLOW flag: %d; ", sim_->underflow_vfp_flag_);
PrintF("INEXACT flag: %d;\n", sim_->inexact_vfp_flag_);
} else if (strcmp(cmd, "stop") == 0) {
int32_t value;
intptr_t stop_pc = sim_->get_pc() - kInstrSize;
Instruction* stop_instr = reinterpret_cast<Instruction*>(stop_pc);
if ((argc == 2) && (strcmp(arg1, "unstop") == 0)) {
// Remove the current stop.
if (stop_instr->IsStop()) {
SetInstructionBitsInCodeSpace(stop_instr, kNopInstr,
sim_->isolate_->heap());
} 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 = 0; i < sim_->kNumOfWatchedStops; 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 = 0; i < sim_->kNumOfWatchedStops; 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 = 0; i < sim_->kNumOfWatchedStops; i++) {
sim_->DisableStop(i);
}
} else if (GetValue(arg2, &value)) {
sim_->DisableStop(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 = 0; i < sim_->kNumOfWatchedStops; i++) {
sim_->DisableStop(i);
}
} else if (GetValue(arg2, &value)) {
sim_->DisableStop(value);
} else {
PrintF("Wrong usage. Use help command for more information.\n");
PrintF("Unrecognized argument.\n");
}
} else if ((strcmp(cmd, "t") == 0) || strcmp(cmd, "trace") == 0) {
::v8::internal::FLAG_trace_sim = !::v8::internal::FLAG_trace_sim;
PrintF("Trace of executed instructions is %s\n",
::v8::internal::FLAG_trace_sim ? "on" : "off");
} 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(" add argument 'fp' to print register pair double values\n");
PrintF("printobject <register>\n");
PrintF(" print an object from a register (alias 'po')\n");
PrintF("flags\n");
PrintF(" print flags\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("dump [<words>]\n");
PrintF(
" dump memory content without pretty printing JS objects, default "
"dump 10 words)\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("trace (alias 't')\n");
PrintF(" toogle the tracing of all executed statements\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 give control to the ArmDebugger.\n");
PrintF(" The first %d stop codes are watched:\n",
Simulator::kNumOfWatchedStops);
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);
}
} else {
PrintF("Wrong usage. Use help command for more information.\n");
}
} else if ((strcmp(cmd, "t") == 0) || strcmp(cmd, "trace") == 0) {
::v8::internal::FLAG_trace_sim = !::v8::internal::FLAG_trace_sim;
PrintF("Trace of executed instructions is %s\n",
::v8::internal::FLAG_trace_sim ? "on" : "off");
} 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(" add argument 'fp' to print register pair double values\n");
PrintF("printobject <register>\n");
PrintF(" print an object from a register (alias 'po')\n");
PrintF("flags\n");
PrintF(" print flags\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("dump [<words>]\n");
PrintF(
" dump memory content without pretty printing JS objects, default "
"dump 10 words)\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("backtrace / bt\n");
PrintF(" Walk the frame pointers, dumping the pc/sp/fp for each frame.\n");
PrintF("del\n");
PrintF(" delete the breakpoint\n");
PrintF("trace (alias 't')\n");
PrintF(" toogle the tracing of all executed statements\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 give control to the ArmDebugger.\n");
PrintF(" The first %d stop codes are watched:\n",
Simulator::kNumOfWatchedStops);
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);
}
// Reinstall breakpoint to stop execution and enter the debugger shell when
// hit.
RedoBreakpoint();
return false;
#undef COMMAND_SIZE
#undef ARG_SIZE
......@@ -577,11 +608,6 @@ static bool AllOnOnePage(uintptr_t start, int size) {
return start_page == end_page;
}
void Simulator::set_last_debugger_input(char* input) {
DeleteArray(last_debugger_input_);
last_debugger_input_ = input;
}
void Simulator::SetRedirectInstruction(Instruction* instruction) {
instruction->SetInstructionBits(al | (0xF * B24) | kCallRtRedirected);
}
......@@ -6499,4 +6525,26 @@ void Simulator::GlobalMonitor::RemoveProcessor(Processor* processor) {
} // namespace internal
} // namespace v8
//
// The following functions are used by our gdb macros.
//
V8_EXPORT_PRIVATE extern bool _v8_internal_Simulator_ExecDebugCommand(
const char* command) {
i::Isolate* isolate = i::Isolate::Current();
if (!isolate) {
fprintf(stderr, "No V8 Isolate found\n");
return false;
}
i::Simulator* simulator = i::Simulator::current(isolate);
if (!simulator) {
fprintf(stderr, "No Arm simulator found\n");
return false;
}
// Copy the command so that the simulator can take ownership of it.
size_t len = strlen(command);
i::ArrayUniquePtr<char> command_copy(i::NewArray<char>(len + 1));
i::MemCopy(command_copy.get(), command, len + 1);
return i::ArmDebugger(simulator).ExecDebugCommand(std::move(command_copy));
}
#endif // USE_SIMULATOR
src/execution/arm/simulator-arm.h
View file @ 7c5e99c0
......@@ -77,6 +77,7 @@ class Simulator : public SimulatorBase {
r14,
r15,
num_registers,
fp = 11,
sp = 13,
lr = 14,
pc = 15,
......@@ -255,8 +256,10 @@ class Simulator : public SimulatorBase {
uintptr_t PopAddress();
// Debugger input.
void set_last_debugger_input(char* input);
char* last_debugger_input() { return last_debugger_input_; }
void set_last_debugger_input(ArrayUniquePtr<char> input) {
last_debugger_input_ = std::move(input);
}
const char* last_debugger_input() { return last_debugger_input_.get(); }
// Redirection support.
static void SetRedirectInstruction(Instruction* instruction);
......@@ -468,7 +471,7 @@ class Simulator : public SimulatorBase {
int icount_;
// Debugger input.
char* last_debugger_input_;
ArrayUniquePtr<char> last_debugger_input_;
// Registered breakpoints.
Instruction* break_pc_;
......
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