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More improvements to GDBStub (#653)

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* More improvements to GDBStub
- Debugging of threads should work correctly with source and assembly level stepping and modifying registers and memory, meaning threads and callstacks are fully clickable in VS.
- List of modules is available to the client, with assumption that .nro and .nso are backed up by an .elf with symbols, while deconstructed ROMs keep N names.
- Initial support for floating point registers.

* Tidy up as requested in PR feedback

* Tidy up as requested in PR feedback
This commit is contained in:
Hedges 2018-07-13 04:22:59 +01:00 committed by bunnei
parent ce23ae3ede
commit e066bc75b9
8 changed files with 176 additions and 53 deletions
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2
src/common/string_util.cpp
View file

@ -134,7 +134,7 @@ bool SplitPath(const std::string& full_path, std::string* _pPath, std::string* _
size_t dir_end = full_path.find_last_of("/"
// windows needs the : included for something like just "C:" to be considered a directory
#ifdef _WIN32
":"
"\\:"
#endif
);
if (std::string::npos == dir_end)

4
src/core/arm/unicorn/arm_unicorn.cpp
View file

@ -193,11 +193,11 @@ void ARM_Unicorn::ExecuteInstructions(int num_instructions) {
}
Kernel::Thread* thread = Kernel::GetCurrentThread();
SaveContext(thread->context);
if (last_bkpt_hit) {
if (last_bkpt_hit || (num_instructions == 1)) {
last_bkpt_hit = false;
GDBStub::Break();
GDBStub::SendTrap(thread, 5);
}
GDBStub::SendTrap(thread, 5);
}
}

200
src/core/gdbstub/gdbstub.cpp
View file

@ -61,10 +61,16 @@ const u32 SIGTERM = 15;
const u32 MSG_WAITALL = 8;
#endif
const u32 X30_REGISTER = 30;
const u32 LR_REGISTER = 30;
const u32 SP_REGISTER = 31;
const u32 PC_REGISTER = 32;
const u32 CPSR_REGISTER = 33;
const u32 UC_ARM64_REG_Q0 = 34;
const u32 FPSCR_REGISTER = 66;
// TODO/WiP - Used while working on support for FPU
const u32 TODO_DUMMY_REG_997 = 997;
const u32 TODO_DUMMY_REG_998 = 998;
// For sample XML files see the GDB source /gdb/features
// GDB also wants the l character at the start
@ -130,6 +136,8 @@ static const char* target_xml =
</flags>
<reg name="cpsr" bitsize="32" type="cpsr_flags"/>
</feature>
<feature name="org.gnu.gdb.aarch64.fpu">
</feature>
</target>
)";
@ -144,6 +152,7 @@ static u32 latest_signal = 0;
static bool memory_break = false;
static Kernel::Thread* current_thread = nullptr;
static u32 current_core = 0;
// Binding to a port within the reserved ports range (0-1023) requires root permissions,
// so default to a port outside of that range.
@ -171,13 +180,34 @@ static std::map<u64, Breakpoint> breakpoints_execute;
static std::map<u64, Breakpoint> breakpoints_read;
static std::map<u64, Breakpoint> breakpoints_write;
struct Module {
std::string name;
PAddr beg;
PAddr end;
};
static std::vector<Module> modules;
void RegisterModule(std::string name, PAddr beg, PAddr end, bool add_elf_ext) {
Module module;
if (add_elf_ext) {
Common::SplitPath(name, nullptr, &module.name, nullptr);
module.name += ".elf";
} else {
module.name = std::move(name);
}
module.beg = beg;
module.end = end;
modules.push_back(std::move(module));
}
static Kernel::Thread* FindThreadById(int id) {
for (int core = 0; core < Core::NUM_CPU_CORES; core++) {
auto threads = Core::System::GetInstance().Scheduler(core)->GetThreadList();
for (auto thread : threads) {
for (u32 core = 0; core < Core::NUM_CPU_CORES; core++) {
const auto& threads = Core::System::GetInstance().Scheduler(core)->GetThreadList();
for (auto& thread : threads) {
if (thread->GetThreadId() == id) {
current_thread = thread.get();
return current_thread;
current_core = core;
return thread.get();
}
}
}
@ -197,6 +227,8 @@ static u64 RegRead(int id, Kernel::Thread* thread = nullptr) {
return thread->context.pc;
} else if (id == CPSR_REGISTER) {
return thread->context.cpsr;
} else if (id > CPSR_REGISTER && id < FPSCR_REGISTER) {
return thread->context.fpu_registers[id - UC_ARM64_REG_Q0][0];
} else {
return 0;
}
@ -215,6 +247,8 @@ static void RegWrite(int id, u64 val, Kernel::Thread* thread = nullptr) {
thread->context.pc = val;
} else if (id == CPSR_REGISTER) {
thread->context.cpsr = val;
} else if (id > CPSR_REGISTER && id < FPSCR_REGISTER) {
thread->context.fpu_registers[id - (CPSR_REGISTER + 1)][0] = val;
}
}
@ -534,7 +568,11 @@ static void HandleQuery() {
SendReply("T0");
} else if (strncmp(query, "Supported", strlen("Supported")) == 0) {
// PacketSize needs to be large enough for target xml
SendReply("PacketSize=2000;qXfer:features:read+");
std::string buffer = "PacketSize=2000;qXfer:features:read+;qXfer:threads:read+";
if (!modules.empty()) {
buffer += ";qXfer:libraries:read+";
}
SendReply(buffer.c_str());
} else if (strncmp(query, "Xfer:features:read:target.xml:",
strlen("Xfer:features:read:target.xml:")) == 0) {
SendReply(target_xml);
@ -543,9 +581,9 @@ static void HandleQuery() {
SendReply(buffer.c_str());
} else if (strncmp(query, "fThreadInfo", strlen("fThreadInfo")) == 0) {
std::string val = "m";
for (int core = 0; core < Core::NUM_CPU_CORES; core++) {
auto threads = Core::System::GetInstance().Scheduler(core)->GetThreadList();
for (auto thread : threads) {
for (u32 core = 0; core < Core::NUM_CPU_CORES; core++) {
const auto& threads = Core::System::GetInstance().Scheduler(core)->GetThreadList();
for (const auto& thread : threads) {
val += fmt::format("{:x}", thread->GetThreadId());
val += ",";
}
@ -554,6 +592,31 @@ static void HandleQuery() {
SendReply(val.c_str());
} else if (strncmp(query, "sThreadInfo", strlen("sThreadInfo")) == 0) {
SendReply("l");
} else if (strncmp(query, "Xfer:threads:read", strlen("Xfer:threads:read")) == 0) {
std::string buffer;
buffer += "l<?xml version=\"1.0\"?>";
buffer += "<threads>";
for (u32 core = 0; core < Core::NUM_CPU_CORES; core++) {
const auto& threads = Core::System::GetInstance().Scheduler(core)->GetThreadList();
for (const auto& thread : threads) {
buffer +=
fmt::format(R"*(<thread id="{:x}" core="{:d}" name="Thread {:x}"></thread>)*",
thread->GetThreadId(), core, thread->GetThreadId());
}
}
buffer += "</threads>";
SendReply(buffer.c_str());
} else if (strncmp(query, "Xfer:libraries:read", strlen("Xfer:libraries:read")) == 0) {
std::string buffer;
buffer += "l<?xml version=\"1.0\"?>";
buffer += "<library-list>";
for (const auto& module : modules) {
buffer +=
fmt::format(R"*("<library name = "{}"><segment address = "0x{:x}"/></library>)*",
module.name, module.beg);
}
buffer += "</library-list>";
SendReply(buffer.c_str());
} else {
SendReply("");
}
@ -561,33 +624,27 @@ static void HandleQuery() {
/// Handle set thread command from gdb client.
static void HandleSetThread() {
if (memcmp(command_buffer, "Hc", 2) == 0 || memcmp(command_buffer, "Hg", 2) == 0) {
int thread_id = -1;
if (command_buffer[2] != '-') {
thread_id = static_cast<int>(HexToInt(
command_buffer + 2,
command_length - 2 /*strlen(reinterpret_cast<char*>(command_buffer) + 2)*/));
}
if (thread_id >= 1) {
current_thread = FindThreadById(thread_id);
}
if (!current_thread) {
thread_id = 1;
current_thread = FindThreadById(thread_id);
}
if (current_thread) {
SendReply("OK");
return;
}
int thread_id = -1;
if (command_buffer[2] != '-') {
thread_id = static_cast<int>(HexToInt(command_buffer + 2, command_length - 2));
}
if (thread_id >= 1) {
current_thread = FindThreadById(thread_id);
}
if (!current_thread) {
thread_id = 1;
current_thread = FindThreadById(thread_id);
}
if (current_thread) {
SendReply("OK");
return;
}
SendReply("E01");
}
/// Handle thread alive command from gdb client.
static void HandleThreadAlive() {
int thread_id = static_cast<int>(
HexToInt(command_buffer + 1,
command_length - 1 /*strlen(reinterpret_cast<char*>(command_buffer) + 1)*/));
int thread_id = static_cast<int>(HexToInt(command_buffer + 1, command_length - 1));
if (thread_id == 0) {
thread_id = 1;
}
@ -610,16 +667,23 @@ static void SendSignal(Kernel::Thread* thread, u32 signal, bool full = true) {
latest_signal = signal;
std::string buffer;
if (full) {
buffer = fmt::format("T{:02x}{:02x}:{:016x};{:02x}:{:016x};", latest_signal, PC_REGISTER,
Common::swap64(RegRead(PC_REGISTER, thread)), SP_REGISTER,
Common::swap64(RegRead(SP_REGISTER, thread)));
} else {
buffer = fmt::format("T{:02x};", latest_signal);
if (!thread) {
full = false;
}
buffer += fmt::format("thread:{:x};", thread->GetThreadId());
std::string buffer;
if (full) {
buffer = fmt::format("T{:02x}{:02x}:{:016x};{:02x}:{:016x};{:02x}:{:016x}", latest_signal,
PC_REGISTER, Common::swap64(RegRead(PC_REGISTER, thread)), SP_REGISTER,
Common::swap64(RegRead(SP_REGISTER, thread)), LR_REGISTER,
Common::swap64(RegRead(LR_REGISTER, thread)));
} else {
buffer = fmt::format("T{:02x}", latest_signal);
}
if (thread) {
buffer += fmt::format(";thread:{:x};", thread->GetThreadId());
}
SendReply(buffer.c_str());
}
@ -711,8 +775,12 @@ static void ReadRegister() {
LongToGdbHex(reply, RegRead(id, current_thread));
} else if (id == CPSR_REGISTER) {
IntToGdbHex(reply, (u32)RegRead(id, current_thread));
} else if (id >= UC_ARM64_REG_Q0 && id < FPSCR_REGISTER) {
LongToGdbHex(reply, RegRead(id, current_thread));
} else if (id == FPSCR_REGISTER) {
LongToGdbHex(reply, RegRead(TODO_DUMMY_REG_998, current_thread));
} else {
return SendReply("E01");
LongToGdbHex(reply, RegRead(TODO_DUMMY_REG_997, current_thread));
}
SendReply(reinterpret_cast<char*>(reply));
@ -729,7 +797,7 @@ static void ReadRegisters() {
LongToGdbHex(bufptr + reg * 16, RegRead(reg, current_thread));
}
bufptr += (32 * 16);
bufptr += 32 * 16;
LongToGdbHex(bufptr, RegRead(PC_REGISTER, current_thread));
@ -739,6 +807,16 @@ static void ReadRegisters() {
bufptr += 8;
for (int reg = UC_ARM64_REG_Q0; reg <= UC_ARM64_REG_Q0 + 31; reg++) {
LongToGdbHex(bufptr + reg * 16, RegRead(reg, current_thread));
}
bufptr += 32 * 32;
LongToGdbHex(bufptr, RegRead(TODO_DUMMY_REG_998, current_thread));
bufptr += 8;
SendReply(reinterpret_cast<char*>(buffer));
}
@ -759,10 +837,17 @@ static void WriteRegister() {
RegWrite(id, GdbHexToLong(buffer_ptr), current_thread);
} else if (id == CPSR_REGISTER) {
RegWrite(id, GdbHexToInt(buffer_ptr), current_thread);
} else if (id >= UC_ARM64_REG_Q0 && id < FPSCR_REGISTER) {
RegWrite(id, GdbHexToLong(buffer_ptr), current_thread);
} else if (id == FPSCR_REGISTER) {
RegWrite(TODO_DUMMY_REG_998, GdbHexToLong(buffer_ptr), current_thread);
} else {
return SendReply("E01");
RegWrite(TODO_DUMMY_REG_997, GdbHexToLong(buffer_ptr), current_thread);
}
// Update Unicorn context skipping scheduler, no running threads at this point
Core::System::GetInstance().ArmInterface(current_core).LoadContext(current_thread->context);
SendReply("OK");
}
@ -773,18 +858,25 @@ static void WriteRegisters() {
if (command_buffer[0] != 'G')
return SendReply("E01");
for (int i = 0, reg = 0; reg <= CPSR_REGISTER; i++, reg++) {
for (int i = 0, reg = 0; reg <= FPSCR_REGISTER; i++, reg++) {
if (reg <= SP_REGISTER) {
RegWrite(reg, GdbHexToLong(buffer_ptr + i * 16), current_thread);
} else if (reg == PC_REGISTER) {
RegWrite(PC_REGISTER, GdbHexToLong(buffer_ptr + i * 16), current_thread);
} else if (reg == CPSR_REGISTER) {
RegWrite(CPSR_REGISTER, GdbHexToInt(buffer_ptr + i * 16), current_thread);
} else if (reg >= UC_ARM64_REG_Q0 && reg < FPSCR_REGISTER) {
RegWrite(reg, GdbHexToLong(buffer_ptr + i * 16), current_thread);
} else if (reg == FPSCR_REGISTER) {
RegWrite(TODO_DUMMY_REG_998, GdbHexToLong(buffer_ptr + i * 16), current_thread);
} else {
UNIMPLEMENTED();
}
}
// Update Unicorn context skipping scheduler, no running threads at this point
Core::System::GetInstance().ArmInterface(current_core).LoadContext(current_thread->context);
SendReply("OK");
}
@ -806,6 +898,10 @@ static void ReadMemory() {
SendReply("E01");
}
if (addr < Memory::PROCESS_IMAGE_VADDR || addr >= Memory::MAP_REGION_VADDR_END) {
return SendReply("E00");
}
if (!Memory::IsValidVirtualAddress(addr)) {
return SendReply("E00");
}
@ -840,16 +936,18 @@ static void WriteMemory() {
}
void Break(bool is_memory_break) {
if (!halt_loop) {
halt_loop = true;
send_trap = true;
}
send_trap = true;
memory_break = is_memory_break;
}
/// Tell the CPU that it should perform a single step.
static void Step() {
if (command_length > 1) {
RegWrite(PC_REGISTER, GdbHexToLong(command_buffer + 1), current_thread);
// Update Unicorn context skipping scheduler, no running threads at this point
Core::System::GetInstance().ArmInterface(current_core).LoadContext(current_thread->context);
}
step_loop = true;
halt_loop = true;
send_trap = true;
@ -1090,6 +1188,8 @@ static void Init(u16 port) {
breakpoints_read.clear();
breakpoints_write.clear();
modules.clear();
// Start gdb server
LOG_INFO(Debug_GDBStub, "Starting GDB server on port {}...", port);
@ -1192,8 +1292,12 @@ void SetCpuStepFlag(bool is_step) {
void SendTrap(Kernel::Thread* thread, int trap) {
if (send_trap) {
if (!halt_loop || current_thread == thread) {
current_thread = thread;
SendSignal(thread, trap);
}
halt_loop = true;
send_trap = false;
SendSignal(thread, trap);
}
}
}; // namespace GDBStub

8
src/core/gdbstub/gdbstub.h
View file

@ -6,6 +6,7 @@
#pragma once
#include <string>
#include "common/common_types.h"
#include "core/hle/kernel/thread.h"
@ -51,6 +52,9 @@ bool IsServerEnabled();
/// Returns true if there is an active socket connection.
bool IsConnected();
/// Register module.
void RegisterModule(std::string name, PAddr beg, PAddr end, bool add_elf_ext = true);
/**
* Signal to the gdbstub server that it should halt CPU execution.
*
@ -80,10 +84,10 @@ BreakpointAddress GetNextBreakpointFromAddress(PAddr addr, GDBStub::BreakpointTy
*/
bool CheckBreakpoint(PAddr addr, GDBStub::BreakpointType type);
// If set to true, the CPU will halt at the beginning of the next CPU loop.
/// If set to true, the CPU will halt at the beginning of the next CPU loop.
bool GetCpuHaltFlag();
// If set to true and the CPU is halted, the CPU will step one instruction.
/// If set to true and the CPU is halted, the CPU will step one instruction.
bool GetCpuStepFlag();
/**

3
src/core/loader/deconstructed_rom_directory.cpp
View file

@ -9,6 +9,7 @@
#include "common/logging/log.h"
#include "common/string_util.h"
#include "core/file_sys/romfs_factory.h"
#include "core/gdbstub/gdbstub.h"
#include "core/hle/kernel/process.h"
#include "core/hle/kernel/resource_limit.h"
#include "core/hle/service/filesystem/filesystem.h"
@ -133,6 +134,8 @@ ResultStatus AppLoader_DeconstructedRomDirectory::Load(
next_load_addr = AppLoader_NSO::LoadModule(path, load_addr);
if (next_load_addr) {
LOG_DEBUG(Loader, "loaded module {} @ 0x{:X}", module, load_addr);
// Register module with GDBStub
GDBStub::RegisterModule(module, load_addr, next_load_addr - 1, false);
} else {
next_load_addr = load_addr;
}

4
src/core/loader/nca.cpp
View file

@ -7,10 +7,12 @@
#include "common/common_funcs.h"
#include "common/file_util.h"
#include "common/logging/log.h"
#include "common/string_util.h"
#include "common/swap.h"
#include "core/core.h"
#include "core/file_sys/program_metadata.h"
#include "core/file_sys/romfs_factory.h"
#include "core/gdbstub/gdbstub.h"
#include "core/hle/kernel/process.h"
#include "core/hle/kernel/resource_limit.h"
#include "core/hle/service/filesystem/filesystem.h"
@ -259,6 +261,8 @@ ResultStatus AppLoader_NCA::Load(Kernel::SharedPtr<Kernel::Process>& process) {
next_load_addr = AppLoader_NSO::LoadModule(module, nca->GetExeFsFile(module), load_addr);
if (next_load_addr) {
LOG_DEBUG(Loader, "loaded module {} @ 0x{:X}", module, load_addr);
// Register module with GDBStub
GDBStub::RegisterModule(module, load_addr, next_load_addr - 1, false);
} else {
next_load_addr = load_addr;
}

4
src/core/loader/nro.cpp
View file

@ -9,6 +9,7 @@
#include "common/logging/log.h"
#include "common/swap.h"
#include "core/core.h"
#include "core/gdbstub/gdbstub.h"
#include "core/hle/kernel/process.h"
#include "core/hle/kernel/resource_limit.h"
#include "core/loader/nro.h"
@ -115,6 +116,9 @@ bool AppLoader_NRO::LoadNro(const std::string& path, VAddr load_base) {
codeset->memory = std::make_shared<std::vector<u8>>(std::move(program_image));
Core::CurrentProcess()->LoadModule(codeset, load_base);
// Register module with GDBStub
GDBStub::RegisterModule(codeset->name, load_base, load_base);
return true;
}

4
src/core/loader/nso.cpp
View file

@ -10,6 +10,7 @@
#include "common/logging/log.h"
#include "common/swap.h"
#include "core/core.h"
#include "core/gdbstub/gdbstub.h"
#include "core/hle/kernel/process.h"
#include "core/hle/kernel/resource_limit.h"
#include "core/loader/nso.h"
@ -147,6 +148,9 @@ VAddr AppLoader_NSO::LoadModule(const std::string& name, const std::vector<u8>&
codeset->memory = std::make_shared<std::vector<u8>>(std::move(program_image));
Core::CurrentProcess()->LoadModule(codeset, load_base);
// Register module with GDBStub
GDBStub::RegisterModule(codeset->name, load_base, load_base);
return load_base + image_size;
}