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Merge pull request #1122 from polaris-/gdbstub

Browse source 
gdbstub implementation
This commit is contained in:
bunnei 2015-11-11 23:21:31 -05:00
commit 43bb29edc5
18 changed files with 1190 additions and 9 deletions
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3
src/citra/citra.cpp
View file

@ -23,6 +23,7 @@
#include "core/settings.h"
#include "core/system.h"
#include "core/core.h"
#include "core/gdbstub/gdbstub.h"
#include "core/loader/loader.h"
#include "citra/config.h"
@ -72,6 +73,8 @@ int main(int argc, char **argv) {
Config config;
log_filter.ParseFilterString(Settings::values.log_filter);
GDBStub::ToggleServer(Settings::values.use_gdbstub);
GDBStub::SetServerPort(static_cast<u32>(Settings::values.gdbstub_port));
EmuWindow_GLFW* emu_window = new EmuWindow_GLFW;

4
src/citra/config.cpp
View file

@ -75,6 +75,10 @@ void Config::ReadValues() {
// Miscellaneous
Settings::values.log_filter = glfw_config->Get("Miscellaneous", "log_filter", "*:Info");
// Debugging
Settings::values.use_gdbstub = glfw_config->GetBoolean("Debugging", "use_gdbstub", false);
Settings::values.gdbstub_port = glfw_config->GetInteger("Debugging", "gdbstub_port", 24689);
}
void Config::Reload() {

5
src/citra/default_ini.h
View file

@ -66,6 +66,11 @@ region_value =
# A filter which removes logs below a certain logging level.
# Examples: *:Debug Kernel.SVC:Trace Service.*:Critical
log_filter = *:Info
[Debugging]
# Port for listening to GDB connections.
use_gdbstub=false
gdbstub_port=24689
)";
}

10
src/citra_qt/config.cpp
View file

@ -62,6 +62,11 @@ void Config::ReadValues() {
qt_config->beginGroup("Miscellaneous");
Settings::values.log_filter = qt_config->value("log_filter", "*:Info").toString().toStdString();
qt_config->endGroup();
qt_config->beginGroup("Debugging");
Settings::values.use_gdbstub = qt_config->value("use_gdbstub", false).toBool();
Settings::values.gdbstub_port = qt_config->value("gdbstub_port", 24689).toInt();
qt_config->endGroup();
}
void Config::SaveValues() {
@ -97,6 +102,11 @@ void Config::SaveValues() {
qt_config->beginGroup("Miscellaneous");
qt_config->setValue("log_filter", QString::fromStdString(Settings::values.log_filter));
qt_config->endGroup();
qt_config->beginGroup("Debugging");
qt_config->setValue("use_gdbstub", Settings::values.use_gdbstub);
qt_config->setValue("gdbstub_port", Settings::values.gdbstub_port);
qt_config->endGroup();
}
void Config::Reload() {

11
src/citra_qt/main.cpp
View file

@ -44,6 +44,7 @@
#include "core/settings.h"
#include "core/system.h"
#include "core/arm/disassembler/load_symbol_map.h"
#include "core/gdbstub/gdbstub.h"
#include "core/loader/loader.h"
#include "video_core/video_core.h"
@ -143,6 +144,11 @@ GMainWindow::GMainWindow() : emu_thread(nullptr)
game_list->LoadInterfaceLayout(settings);
ui.action_Use_Gdbstub->setChecked(Settings::values.use_gdbstub);
SetGdbstubEnabled(ui.action_Use_Gdbstub->isChecked());
GDBStub::SetServerPort(static_cast<u32>(Settings::values.gdbstub_port));
ui.action_Use_Hardware_Renderer->setChecked(Settings::values.use_hw_renderer);
SetHardwareRendererEnabled(ui.action_Use_Hardware_Renderer->isChecked());
@ -175,6 +181,7 @@ GMainWindow::GMainWindow() : emu_thread(nullptr)
connect(ui.action_Stop, SIGNAL(triggered()), this, SLOT(OnStopGame()));
connect(ui.action_Use_Hardware_Renderer, SIGNAL(triggered(bool)), this, SLOT(SetHardwareRendererEnabled(bool)));
connect(ui.action_Use_Shader_JIT, SIGNAL(triggered(bool)), this, SLOT(SetShaderJITEnabled(bool)));
connect(ui.action_Use_Gdbstub, SIGNAL(triggered(bool)), this, SLOT(SetGdbstubEnabled(bool)));
connect(ui.action_Single_Window_Mode, SIGNAL(triggered(bool)), this, SLOT(ToggleWindowMode()));
connect(ui.action_Hotkeys, SIGNAL(triggered()), this, SLOT(OnOpenHotkeysDialog()));
@ -449,6 +456,10 @@ void GMainWindow::SetHardwareRendererEnabled(bool enabled) {
config.Save();
}
void GMainWindow::SetGdbstubEnabled(bool enabled) {
GDBStub::ToggleServer(enabled);
}
void GMainWindow::SetShaderJITEnabled(bool enabled) {
VideoCore::g_shader_jit_enabled = enabled;

1
src/citra_qt/main.h
View file

@ -99,6 +99,7 @@ private slots:
void OnConfigure();
void OnDisplayTitleBars(bool);
void SetHardwareRendererEnabled(bool);
void SetGdbstubEnabled(bool);
void SetShaderJITEnabled(bool);
void ToggleWindowMode();

9
src/citra_qt/main.ui
View file

@ -75,6 +75,7 @@
<addaction name="separator"/>
<addaction name="action_Use_Hardware_Renderer"/>
<addaction name="action_Use_Shader_JIT"/>
<addaction name="action_Use_Gdbstub"/>
<addaction name="action_Configure"/>
</widget>
<widget class="QMenu" name="menu_View">
@ -170,6 +171,14 @@
<string>Use Shader JIT</string>
</property>
</action>
<action name="action_Use_Gdbstub">
<property name="checkable">
<bool>true</bool>
</property>
<property name="text">
<string>Use Gdbstub</string>
</property>
</action>
<action name="action_Configure">
<property name="text">
<string>Configure ...</string>

1
src/common/logging/backend.cpp
View file

@ -29,6 +29,7 @@ namespace Log {
SUB(Debug, Emulated) \
SUB(Debug, GPU) \
SUB(Debug, Breakpoint) \
SUB(Debug, GDBStub) \
CLS(Kernel) \
SUB(Kernel, SVC) \
CLS(Service) \

1
src/common/logging/log.h
View file

@ -43,6 +43,7 @@ enum class Class : ClassType {
Debug_Emulated, ///< Debug messages from the emulated programs
Debug_GPU, ///< GPU debugging tools
Debug_Breakpoint, ///< Logging breakpoints and watchpoints
Debug_GDBStub, ///< GDB Stub
Kernel, ///< The HLE implementation of the CTR kernel
Kernel_SVC, ///< Kernel system calls
Service, ///< HLE implementation of system services. Each major service

2
src/core/CMakeLists.txt
View file

@ -22,6 +22,7 @@ set(SRCS
file_sys/archive_systemsavedata.cpp
file_sys/disk_archive.cpp
file_sys/ivfc_archive.cpp
gdbstub/gdbstub.cpp
hle/config_mem.cpp
hle/hle.cpp
hle/applets/applet.cpp
@ -149,6 +150,7 @@ set(HEADERS
file_sys/disk_archive.h
file_sys/file_backend.h
file_sys/ivfc_archive.h
gdbstub/gdbstub.h
hle/config_mem.h
hle/function_wrappers.h
hle/hle.h

40
src/core/arm/dyncom/arm_dyncom_interpreter.cpp
View file

@ -23,6 +23,8 @@
#include "core/arm/skyeye_common/armsupp.h"
#include "core/arm/skyeye_common/vfp/vfp.h"
#include "core/gdbstub/gdbstub.h"
Common::Profiling::TimingCategory profile_execute("DynCom::Execute");
Common::Profiling::TimingCategory profile_decode("DynCom::Decode");
@ -3548,6 +3550,7 @@ static int InterpreterTranslate(ARMul_State* cpu, int& bb_start, u32 addr) {
CITRA_IGNORE_EXIT(-1);
}
inst_base = arm_instruction_trans[idx](inst, idx);
translated:
phys_addr += inst_size;
@ -3580,6 +3583,8 @@ unsigned InterpreterMainLoop(ARMul_State* cpu) {
Common::Profiling::ScopeTimer timer_execute(profile_execute);
MICROPROFILE_SCOPE(DynCom_Execute);
GDBStub::BreakpointAddress breakpoint_data;
#undef RM
#undef RS
@ -3604,15 +3609,27 @@ unsigned InterpreterMainLoop(ARMul_State* cpu) {
#define INC_PC(l) ptr += sizeof(arm_inst) + l
#define INC_PC_STUB ptr += sizeof(arm_inst)
#define GDB_BP_CHECK \
cpu->Cpsr &= ~(1 << 5); \
cpu->Cpsr |= cpu->TFlag << 5; \
if (GDBStub::g_server_enabled) { \
if (GDBStub::IsMemoryBreak() || (breakpoint_data.type != GDBStub::BreakpointType::None && PC == breakpoint_data.address)) { \
GDBStub::Break(); \
goto END; \
} \
}
// GCC and Clang have a C++ extension to support a lookup table of labels. Otherwise, fallback to a
// clunky switch statement.
#if defined __GNUC__ || defined __clang__
#define GOTO_NEXT_INST \
GDB_BP_CHECK; \
if (num_instrs >= cpu->NumInstrsToExecute) goto END; \
num_instrs++; \
goto *InstLabel[inst_base->idx]
#else
#define GOTO_NEXT_INST \
GDB_BP_CHECK; \
if (num_instrs >= cpu->NumInstrsToExecute) goto END; \
num_instrs++; \
switch(inst_base->idx) { \
@ -3903,6 +3920,11 @@ unsigned InterpreterMainLoop(ARMul_State* cpu) {
goto END;
}
// Find breakpoint if one exists within the block
if (GDBStub::g_server_enabled && GDBStub::IsConnected()) {
breakpoint_data = GDBStub::GetNextBreakpointFromAddress(cpu->Reg[15], GDBStub::BreakpointType::Execute);
}
inst_base = (arm_inst *)&inst_buf[ptr];
GOTO_NEXT_INST;
}
@ -4454,7 +4476,7 @@ unsigned InterpreterMainLoop(ARMul_State* cpu) {
ldst_inst* inst_cream = (ldst_inst*)inst_base->component;
inst_cream->get_addr(cpu, inst_cream->inst, addr);
cpu->Reg[BITS(inst_cream->inst, 12, 15)] = Memory::Read8(addr);
cpu->Reg[BITS(inst_cream->inst, 12, 15)] = cpu->ReadMemory8(addr);
if (BITS(inst_cream->inst, 12, 15) == 15) {
INC_PC(sizeof(ldst_inst));
@ -4472,7 +4494,7 @@ unsigned InterpreterMainLoop(ARMul_State* cpu) {
ldst_inst* inst_cream = (ldst_inst*)inst_base->component;
inst_cream->get_addr(cpu, inst_cream->inst, addr);
cpu->Reg[BITS(inst_cream->inst, 12, 15)] = Memory::Read8(addr);
cpu->Reg[BITS(inst_cream->inst, 12, 15)] = cpu->ReadMemory8(addr);
if (BITS(inst_cream->inst, 12, 15) == 15) {
INC_PC(sizeof(ldst_inst));
@ -4531,7 +4553,7 @@ unsigned InterpreterMainLoop(ARMul_State* cpu) {
cpu->SetExclusiveMemoryAddress(read_addr);
RD = Memory::Read8(read_addr);
RD = cpu->ReadMemory8(read_addr);
if (inst_cream->Rd == 15) {
INC_PC(sizeof(generic_arm_inst));
goto DISPATCH;
@ -4604,7 +4626,7 @@ unsigned InterpreterMainLoop(ARMul_State* cpu) {
if (inst_base->cond == ConditionCode::AL || CondPassed(cpu, inst_base->cond)) {
ldst_inst* inst_cream = (ldst_inst*)inst_base->component;
inst_cream->get_addr(cpu, inst_cream->inst, addr);
unsigned int value = Memory::Read8(addr);
unsigned int value = cpu->ReadMemory8(addr);
if (BIT(value, 7)) {
value |= 0xffffff00;
}
@ -6027,7 +6049,7 @@ unsigned InterpreterMainLoop(ARMul_State* cpu) {
ldst_inst* inst_cream = (ldst_inst*)inst_base->component;
inst_cream->get_addr(cpu, inst_cream->inst, addr);
unsigned int value = cpu->Reg[BITS(inst_cream->inst, 12, 15)] & 0xff;
Memory::Write8(addr, value);
cpu->WriteMemory8(addr, value);
}
cpu->Reg[15] += cpu->GetInstructionSize();
INC_PC(sizeof(ldst_inst));
@ -6040,7 +6062,7 @@ unsigned InterpreterMainLoop(ARMul_State* cpu) {
ldst_inst* inst_cream = (ldst_inst*)inst_base->component;
inst_cream->get_addr(cpu, inst_cream->inst, addr);
unsigned int value = cpu->Reg[BITS(inst_cream->inst, 12, 15)] & 0xff;
Memory::Write8(addr, value);
cpu->WriteMemory8(addr, value);
}
cpu->Reg[15] += cpu->GetInstructionSize();
INC_PC(sizeof(ldst_inst));
@ -6091,7 +6113,7 @@ unsigned InterpreterMainLoop(ARMul_State* cpu) {
if (cpu->IsExclusiveMemoryAccess(write_addr)) {
cpu->UnsetExclusiveMemoryAddress();
Memory::Write8(write_addr, cpu->Reg[inst_cream->Rm]);
cpu->WriteMemory8(write_addr, cpu->Reg[inst_cream->Rm]);
RD = 0;
} else {
// Failed to write due to mutex access
@ -6250,8 +6272,8 @@ unsigned InterpreterMainLoop(ARMul_State* cpu) {
if (inst_base->cond == ConditionCode::AL || CondPassed(cpu, inst_base->cond)) {
swp_inst* inst_cream = (swp_inst*)inst_base->component;
addr = RN;
unsigned int value = Memory::Read8(addr);
Memory::Write8(addr, (RM & 0xFF));
unsigned int value = cpu->ReadMemory8(addr);
cpu->WriteMemory8(addr, (RM & 0xFF));
RD = value;
}
cpu->Reg[15] += cpu->GetInstructionSize();

35
src/core/arm/skyeye_common/armstate.cpp
View file

@ -7,6 +7,7 @@
#include "core/memory.h"
#include "core/arm/skyeye_common/armstate.h"
#include "core/arm/skyeye_common/vfp/vfp.h"
#include "core/gdbstub/gdbstub.h"
ARMul_State::ARMul_State(PrivilegeMode initial_mode)
{
@ -185,8 +186,25 @@ void ARMul_State::ResetMPCoreCP15Registers()
CP15[CP15_TLB_DEBUG_CONTROL] = 0x00000000;
}
static void CheckMemoryBreakpoint(u32 address, GDBStub::BreakpointType type)
{
if (GDBStub::g_server_enabled && GDBStub::CheckBreakpoint(address, type)) {
LOG_DEBUG(Debug, "Found memory breakpoint @ %08x", address);
GDBStub::Break(true);
}
}
u8 ARMul_State::ReadMemory8(u32 address) const
{
CheckMemoryBreakpoint(address, GDBStub::BreakpointType::Read);
return Memory::Read8(address);
}
u16 ARMul_State::ReadMemory16(u32 address) const
{
CheckMemoryBreakpoint(address, GDBStub::BreakpointType::Read);
u16 data = Memory::Read16(address);
if (InBigEndianMode())
@ -197,6 +215,8 @@ u16 ARMul_State::ReadMemory16(u32 address) const
u32 ARMul_State::ReadMemory32(u32 address) const
{
CheckMemoryBreakpoint(address, GDBStub::BreakpointType::Read);
u32 data = Memory::Read32(address);
if (InBigEndianMode())
@ -207,6 +227,8 @@ u32 ARMul_State::ReadMemory32(u32 address) const
u64 ARMul_State::ReadMemory64(u32 address) const
{
CheckMemoryBreakpoint(address, GDBStub::BreakpointType::Read);
u64 data = Memory::Read64(address);
if (InBigEndianMode())
@ -215,8 +237,17 @@ u64 ARMul_State::ReadMemory64(u32 address) const
return data;
}
void ARMul_State::WriteMemory8(u32 address, u8 data)
{
CheckMemoryBreakpoint(address, GDBStub::BreakpointType::Write);
Memory::Write8(address, data);
}
void ARMul_State::WriteMemory16(u32 address, u16 data)
{
CheckMemoryBreakpoint(address, GDBStub::BreakpointType::Write);
if (InBigEndianMode())
data = Common::swap16(data);
@ -225,6 +256,8 @@ void ARMul_State::WriteMemory16(u32 address, u16 data)
void ARMul_State::WriteMemory32(u32 address, u32 data)
{
CheckMemoryBreakpoint(address, GDBStub::BreakpointType::Write);
if (InBigEndianMode())
data = Common::swap32(data);
@ -233,6 +266,8 @@ void ARMul_State::WriteMemory32(u32 address, u32 data)
void ARMul_State::WriteMemory64(u32 address, u64 data)
{
CheckMemoryBreakpoint(address, GDBStub::BreakpointType::Write);
if (InBigEndianMode())
data = Common::swap64(data);

2
src/core/arm/skyeye_common/armstate.h
View file

@ -153,9 +153,11 @@ public:
// Reads/writes data in big/little endian format based on the
// state of the E (endian) bit in the APSR.
u8 ReadMemory8(u32 address) const;
u16 ReadMemory16(u32 address) const;
u32 ReadMemory32(u32 address) const;
u64 ReadMemory64(u32 address) const;
void WriteMemory8(u32 address, u8 data);
void WriteMemory16(u32 address, u16 data);
void WriteMemory32(u32 address, u32 data);
void WriteMemory64(u32 address, u64 data);

17
src/core/core.cpp
View file

@ -13,6 +13,8 @@
#include "core/hle/kernel/thread.h"
#include "core/hw/hw.h"
#include "core/gdbstub/gdbstub.h"
namespace Core {
ARM_Interface* g_app_core = nullptr; ///< ARM11 application core
@ -20,6 +22,21 @@ ARM_Interface* g_sys_core = nullptr; ///< ARM11 system (OS) core
/// Run the core CPU loop
void RunLoop(int tight_loop) {
if (GDBStub::g_server_enabled) {
GDBStub::HandlePacket();
// If the loop is halted and we want to step, use a tiny (1) number of instructions to execute.
// Otherwise get out of the loop function.
if (GDBStub::GetCpuHaltFlag()) {
if (GDBStub::GetCpuStepFlag()) {
GDBStub::SetCpuStepFlag(false);
tight_loop = 1;
} else {
return;
}
}
}
// If we don't have a currently active thread then don't execute instructions,
// instead advance to the next event and try to yield to the next thread
if (Kernel::GetCurrentThread() == nullptr) {

955
src/core/gdbstub/gdbstub.cpp Normal file
View file

@ -0,0 +1,955 @@
// Copyright 2013 Dolphin Emulator Project
// Licensed under GPLv2+
// Refer to the license.txt file included.
// Originally written by Sven Peter <sven@fail0verflow.com> for anergistic.
#include <algorithm>
#include <climits>
#include <csignal>
#include <cstdarg>
#include <cstdio>
#include <cstring>
#include <fcntl.h>
#include <map>
#include <numeric>
#ifdef _MSC_VER
#include <WinSock2.h>
#include <ws2tcpip.h>
#include <common/x64/abi.h>
#include <io.h>
#include <iphlpapi.h>
#define SHUT_RDWR 2
#else
#include <unistd.h>
#include <sys/select.h>
#include <sys/socket.h>
#include <sys/un.h>
#include <netinet/in.h>
#endif
#include "common/logging/log.h"
#include "common/string_util.h"
#include "core/core.h"
#include "core/memory.h"
#include "core/arm/arm_interface.h"
#include "core/gdbstub/gdbstub.h"
const int GDB_BUFFER_SIZE = 10000;
const char GDB_STUB_START = '$';
const char GDB_STUB_END = '#';
const char GDB_STUB_ACK = '+';
const char GDB_STUB_NACK = '-';
#ifndef SIGTRAP
const u32 SIGTRAP = 5;
#endif
#ifndef SIGTERM
const u32 SIGTERM = 15;
#endif
#ifndef MSG_WAITALL
const u32 MSG_WAITALL = 8;
#endif
const u32 R0_REGISTER = 0;
const u32 R15_REGISTER = 15;
const u32 CSPR_REGISTER = 25;
const u32 FPSCR_REGISTER = 58;
const u32 MAX_REGISTERS = 90;
namespace GDBStub {
static int gdbserver_socket = -1;
static u8 command_buffer[GDB_BUFFER_SIZE];
static u32 command_length;
static u32 latest_signal = 0;
static bool step_break = false;
static bool memory_break = false;
// Binding to a port within the reserved ports range (0-1023) requires root permissions,
// so default to a port outside of that range.
static u16 gdbstub_port = 24689;
static bool halt_loop = true;
static bool step_loop = false;
std::atomic<bool> g_server_enabled(false);
#ifdef _WIN32
WSADATA InitData;
#endif
struct Breakpoint {
bool active;
PAddr addr;
u32 len;
};
static std::map<u32, Breakpoint> breakpoints_execute;
static std::map<u32, Breakpoint> breakpoints_read;
static std::map<u32, Breakpoint> breakpoints_write;
/**
* Turns hex string character into the equivalent byte.
*
* @param hex Input hex character to be turned into byte.
*/
static u8 HexCharToValue(u8 hex) {
if (hex >= '0' && hex <= '9') {
return hex - '0';
} else if (hex >= 'a' && hex <= 'f') {
return hex - 'a' + 0xA;
} else if (hex >= 'A' && hex <= 'F') {
return hex - 'A' + 0xA;
}
LOG_ERROR(Debug_GDBStub, "Invalid nibble: %c (%02x)\n", hex, hex);
return 0;
}
/**
* Turn nibble of byte into hex string character.
*
* @param n Nibble to be turned into hex character.
*/
static u8 NibbleToHex(u8 n) {
n &= 0xF;
if (n < 0xA) {
return '0' + n;
} else {
return 'A' + n - 0xA;
}
}
/**
* Converts input hex string characters into an array of equivalent of u8 bytes.
*
* @param dest Pointer to buffer to store u8 bytes.
* @param src Pointer to array of output hex string characters.
* @param len Length of src array.
*/
static u32 HexToInt(u8* src, u32 len) {
u32 output = 0;
while (len-- > 0) {
output = (output << 4) | HexCharToValue(src[0]);
src++;
}
return output;
}
/**
* Converts input array of u8 bytes into their equivalent hex string characters.
*
* @param dest Pointer to buffer to store output hex string characters.
* @param src Pointer to array of u8 bytes.
* @param len Length of src array.
*/
static void MemToGdbHex(u8* dest, u8* src, u32 len) {
while (len-- > 0) {
u8 tmp = *src++;
*dest++ = NibbleToHex(tmp >> 4);
*dest++ = NibbleToHex(tmp);
}
}
/**
* Converts input gdb-formatted hex string characters into an array of equivalent of u8 bytes.
*
* @param dest Pointer to buffer to store u8 bytes.
* @param src Pointer to array of output hex string characters.
* @param len Length of src array.
*/
static void GdbHexToMem(u8* dest, u8* src, u32 len) {
while (len-- > 0) {
*dest++ = (HexCharToValue(src[0]) << 4) | HexCharToValue(src[1]);
src += 2;
}
}
/**
* Convert a u32 into a gdb-formatted hex string.
*
* @param dest Pointer to buffer to store output hex string characters.
*/
static void IntToGdbHex(u8* dest, u32 v) {
for (int i = 0; i < 8; i += 2) {
dest[i + 1] = NibbleToHex(v >> (4 * i));
dest[i] = NibbleToHex(v >> (4 * (i + 1)));
}
}
/**
* Convert a gdb-formatted hex string into a u32.
*
* @param src Pointer to hex string.
*/
static u32 GdbHexToInt(u8* src) {
u32 output = 0;
for (int i = 0; i < 8; i += 2) {
output = (output << 4) | HexCharToValue(src[7 - i - 1]);
output = (output << 4) | HexCharToValue(src[7 - i]);
}
return output;
}
/// Read a byte from the gdb client.
static u8 ReadByte() {
u8 c;
size_t received_size = recv(gdbserver_socket, reinterpret_cast<char*>(&c), 1, MSG_WAITALL);
if (received_size != 1) {
LOG_ERROR(Debug_GDBStub, "recv failed : %ld", received_size);
Shutdown();
}
return c;
}
/// Calculate the checksum of the current command buffer.
static u8 CalculateChecksum(u8 *buffer, u32 length) {
return static_cast<u8>(std::accumulate(buffer, buffer + length, 0, std::plus<u8>()));
}
/**
* Get the list of breakpoints for a given breakpoint type.
*
* @param type Type of breakpoint list.
*/
static std::map<u32, Breakpoint>& GetBreakpointList(BreakpointType type) {
switch (type) {
case BreakpointType::Execute:
return breakpoints_execute;
case BreakpointType::Read:
return breakpoints_read;
case BreakpointType::Write:
return breakpoints_write;
default:
return breakpoints_read;
}
}
/**
* Remove the breakpoint from the given address of the specified type.
*
* @param type Type of breakpoint.
* @param addr Address of breakpoint.
*/
static void RemoveBreakpoint(BreakpointType type, PAddr addr) {
std::map<u32, Breakpoint>& p = GetBreakpointList(type);
auto bp = p.find(addr);
if (bp != p.end()) {
LOG_DEBUG(Debug_GDBStub, "gdb: removed a breakpoint: %08x bytes at %08x of type %d\n", bp->second.len, bp->second.addr, type);
p.erase(addr);
}
}
BreakpointAddress GetNextBreakpointFromAddress(PAddr addr, BreakpointType type) {
std::map<u32, Breakpoint>& p = GetBreakpointList(type);
auto next_breakpoint = p.lower_bound(addr);
BreakpointAddress breakpoint;
if (next_breakpoint != p.end()) {
breakpoint.address = next_breakpoint->first;
breakpoint.type = type;
} else {
breakpoint.address = 0;
breakpoint.type = BreakpointType::None;
}
return breakpoint;
}
bool CheckBreakpoint(PAddr addr, BreakpointType type) {
if (!IsConnected()) {
return false;
}
std::map<u32, Breakpoint>& p = GetBreakpointList(type);
auto bp = p.find(addr);
if (bp != p.end()) {
u32 len = bp->second.len;
// IDA Pro defaults to 4-byte breakpoints for all non-hardware breakpoints
// no matter if it's a 4-byte or 2-byte instruction. When you execute a
// Thumb instruction with a 4-byte breakpoint set, it will set a breakpoint on
// two instructions instead of the single instruction you placed the breakpoint
// on. So, as a way to make sure that execution breakpoints are only breaking
// on the instruction that was specified, set the length of an execution
// breakpoint to 1. This should be fine since the CPU should never begin executing
// an instruction anywhere except the beginning of the instruction.
if (type == BreakpointType::Execute) {
len = 1;
}
if (bp->second.active && (addr >= bp->second.addr && addr < bp->second.addr + len)) {
LOG_DEBUG(Debug_GDBStub, "Found breakpoint type %d @ %08x, range: %08x - %08x (%d bytes)\n", type, addr, bp->second.addr, bp->second.addr + len, len);
return true;
}
}
return false;
}
/**
* Send packet to gdb client.
*
* @param packet Packet to be sent to client.
*/
static void SendPacket(const char packet) {
size_t sent_size = send(gdbserver_socket, &packet, 1, 0);
if (sent_size != 1) {
LOG_ERROR(Debug_GDBStub, "send failed");
}
}
/**
* Send reply to gdb client.
*
* @param reply Reply to be sent to client.
*/
static void SendReply(const char* reply) {
if (!IsConnected()) {
return;
}
memset(command_buffer, 0, sizeof(command_buffer));
command_length = strlen(reply);
if (command_length + 4 > sizeof(command_buffer)) {
LOG_ERROR(Debug_GDBStub, "command_buffer overflow in SendReply");
return;
}
memcpy(command_buffer + 1, reply, command_length);
u8 checksum = CalculateChecksum(command_buffer, command_length + 1);
command_buffer[0] = GDB_STUB_START;
command_buffer[command_length + 1] = GDB_STUB_END;
command_buffer[command_length + 2] = NibbleToHex(checksum >> 4);
command_buffer[command_length + 3] = NibbleToHex(checksum);
u8* ptr = command_buffer;
u32 left = command_length + 4;
while (left > 0) {
int sent_size = send(gdbserver_socket, reinterpret_cast<char*>(ptr), left, 0);
if (sent_size < 0) {
LOG_ERROR(Debug_GDBStub, "gdb: send failed");
return Shutdown();
}
left -= sent_size;
ptr += sent_size;
}
}
/// Handle query command from gdb client.
static void HandleQuery() {
LOG_DEBUG(Debug_GDBStub, "gdb: query '%s'\n", command_buffer + 1);
if (!strcmp(reinterpret_cast<const char*>(command_buffer + 1), "TStatus")) {
SendReply("T0");
} else {
SendReply("");
}
}
/// Handle set thread command from gdb client.
static void HandleSetThread() {
if (memcmp(command_buffer, "Hg0", 3) == 0 ||
memcmp(command_buffer, "Hc-1", 4) == 0 ||
memcmp(command_buffer, "Hc0", 4) == 0 ||
memcmp(command_buffer, "Hc1", 4) == 0) {
return SendReply("OK");
}
SendReply("E01");
}
/**
* Send signal packet to client.
*
* @param signal Signal to be sent to client.
*/
void SendSignal(u32 signal) {
if (gdbserver_socket == -1) {
return;
}
latest_signal = signal;
std::string buffer = Common::StringFromFormat("T%02x%02x:%08x;%02x:%08x;", latest_signal, 15, htonl(Core::g_app_core->GetPC()), 13, htonl(Core::g_app_core->GetReg(13)));
LOG_DEBUG(Debug_GDBStub, "Response: %s", buffer.c_str());
SendReply(buffer.c_str());
}
/// Read command from gdb client.
static void ReadCommand() {
command_length = 0;
memset(command_buffer, 0, sizeof(command_buffer));
u8 c = ReadByte();
if (c == '+') {
//ignore ack
return;
} else if (c == 0x03) {
LOG_INFO(Debug_GDBStub, "gdb: found break command\n");
halt_loop = true;
SendSignal(SIGTRAP);
return;
} else if (c != GDB_STUB_START) {
LOG_DEBUG(Debug_GDBStub, "gdb: read invalid byte %02x\n", c);
return;
}
while ((c = ReadByte()) != GDB_STUB_END) {
if (command_length >= sizeof(command_buffer)) {
LOG_ERROR(Debug_GDBStub, "gdb: command_buffer overflow\n");
SendPacket(GDB_STUB_NACK);
return;
}
command_buffer[command_length++] = c;
}
u8 checksum_received = HexCharToValue(ReadByte()) << 4;
checksum_received |= HexCharToValue(ReadByte());
u8 checksum_calculated = CalculateChecksum(command_buffer, command_length);
if (checksum_received != checksum_calculated) {
LOG_ERROR(Debug_GDBStub, "gdb: invalid checksum: calculated %02x and read %02x for $%s# (length: %d)\n",
checksum_calculated, checksum_received, command_buffer, command_length);
command_length = 0;
SendPacket(GDB_STUB_NACK);
return;
}
SendPacket(GDB_STUB_ACK);
}
/// Check if there is data to be read from the gdb client.
static bool IsDataAvailable() {
if (!IsConnected()) {
return false;
}
fd_set fd_socket;
FD_ZERO(&fd_socket);
FD_SET(gdbserver_socket, &fd_socket);
struct timeval t;
t.tv_sec = 0;
t.tv_usec = 0;
if (select(gdbserver_socket + 1, &fd_socket, nullptr, nullptr, &t) < 0) {
LOG_ERROR(Debug_GDBStub, "select failed");
return false;
}
return FD_ISSET(gdbserver_socket, &fd_socket);
}
/// Send requested register to gdb client.
static void ReadRegister() {
static u8 reply[64];
memset(reply, 0, sizeof(reply));
u32 id = HexCharToValue(command_buffer[1]);
if (command_buffer[2] != '\0') {
id <<= 4;
id |= HexCharToValue(command_buffer[2]);
}
if (id >= R0_REGISTER && id <= R15_REGISTER) {
IntToGdbHex(reply, Core::g_app_core->GetReg(id));
} else if (id == CSPR_REGISTER) {
IntToGdbHex(reply, Core::g_app_core->GetCPSR());
} else if (id > CSPR_REGISTER && id < FPSCR_REGISTER) {
IntToGdbHex(reply, Core::g_app_core->GetVFPReg(id - CSPR_REGISTER - 1)); // VFP registers should start at 26, so one after CSPR_REGISTER
} else if (id == FPSCR_REGISTER) {
IntToGdbHex(reply, Core::g_app_core->GetVFPSystemReg(VFP_FPSCR)); // Get FPSCR
IntToGdbHex(reply + 8, 0);
} else {
return SendReply("E01");
}
SendReply(reinterpret_cast<char*>(reply));
}
/// Send all registers to the gdb client.
static void ReadRegisters() {
static u8 buffer[GDB_BUFFER_SIZE - 4];
memset(buffer, 0, sizeof(buffer));
u8* bufptr = buffer;
for (int i = 0, reg = 0; i <= MAX_REGISTERS; i++, reg++) {
if (i <= R15_REGISTER) {
IntToGdbHex(bufptr + i * CHAR_BIT, Core::g_app_core->GetReg(reg));
} else if (i == CSPR_REGISTER) {
IntToGdbHex(bufptr + i * CHAR_BIT, Core::g_app_core->GetCPSR());
} else if (i < CSPR_REGISTER) {
IntToGdbHex(bufptr + i * CHAR_BIT, 0);
IntToGdbHex(bufptr + (i + 1) * CHAR_BIT, 0);
i++; // These registers seem to be all 64bit instead of 32bit, so skip two instead of one
reg++;
} else if (i > CSPR_REGISTER && i < MAX_REGISTERS) {
IntToGdbHex(bufptr + i * CHAR_BIT, Core::g_app_core->GetVFPReg(reg - CSPR_REGISTER - 1));
IntToGdbHex(bufptr + (i + 1) * CHAR_BIT, 0);
i++;
} else if (i == MAX_REGISTERS) {
IntToGdbHex(bufptr + i * CHAR_BIT, Core::g_app_core->GetVFPSystemReg(VFP_FPSCR));
}
}
SendReply(reinterpret_cast<char*>(buffer));
}
/// Modify data of register specified by gdb client.
static void WriteRegister() {
u8* buffer_ptr = command_buffer + 3;
u32 id = HexCharToValue(command_buffer[1]);
if (command_buffer[2] != '=') {
++buffer_ptr;
id <<= 4;
id |= HexCharToValue(command_buffer[2]);
}
if (id >= R0_REGISTER && id <= R15_REGISTER) {
Core::g_app_core->SetReg(id, GdbHexToInt(buffer_ptr));
} else if (id == CSPR_REGISTER) {
Core::g_app_core->SetCPSR(GdbHexToInt(buffer_ptr));
} else if (id > CSPR_REGISTER && id < FPSCR_REGISTER) {
Core::g_app_core->SetVFPReg(id - CSPR_REGISTER - 1, GdbHexToInt(buffer_ptr));
} else if (id == FPSCR_REGISTER) {
Core::g_app_core->SetVFPSystemReg(VFP_FPSCR, GdbHexToInt(buffer_ptr));
} else {
return SendReply("E01");
}
SendReply("OK");
}
/// Modify all registers with data received from the client.
static void WriteRegisters() {
u8* buffer_ptr = command_buffer + 1;
if (command_buffer[0] != 'G')
return SendReply("E01");
for (int i = 0, reg = 0; i <= MAX_REGISTERS; i++, reg++) {
if (i <= R15_REGISTER) {
Core::g_app_core->SetReg(reg, GdbHexToInt(buffer_ptr + i * CHAR_BIT));
} else if (i == CSPR_REGISTER) {
Core::g_app_core->SetCPSR(GdbHexToInt(buffer_ptr + i * CHAR_BIT));
} else if (i < CSPR_REGISTER) {
i++; // These registers seem to be all 64bit instead of 32bit, so skip two instead of one
reg++;
} else if (i > CSPR_REGISTER && i < MAX_REGISTERS) {
Core::g_app_core->SetVFPReg(reg - CSPR_REGISTER - 1, GdbHexToInt(buffer_ptr + i * CHAR_BIT));
i++; // Skip padding
} else if (i == MAX_REGISTERS) {
Core::g_app_core->SetVFPSystemReg(VFP_FPSCR, GdbHexToInt(buffer_ptr + i * CHAR_BIT));
}
}
SendReply("OK");
}
/// Read location in memory specified by gdb client.
static void ReadMemory() {
static u8 reply[GDB_BUFFER_SIZE - 4];
auto start_offset = command_buffer+1;
auto addr_pos = std::find(start_offset, command_buffer+command_length, ',');
PAddr addr = HexToInt(start_offset, addr_pos - start_offset);
start_offset = addr_pos+1;
u32 len = HexToInt(start_offset, (command_buffer + command_length) - start_offset);
LOG_DEBUG(Debug_GDBStub, "gdb: addr: %08x len: %08x\n", addr, len);
if (len * 2 > sizeof(reply)) {
SendReply("E01");
}
u8* data = Memory::GetPointer(addr);
if (!data) {
return SendReply("E0");
}
MemToGdbHex(reply, data, len);
reply[len * 2] = '\0';
SendReply(reinterpret_cast<char*>(reply));
}
/// Modify location in memory with data received from the gdb client.
static void WriteMemory() {
auto start_offset = command_buffer+1;
auto addr_pos = std::find(start_offset, command_buffer+command_length, ',');
PAddr addr = HexToInt(start_offset, addr_pos - start_offset);
start_offset = addr_pos+1;
auto len_pos = std::find(start_offset, command_buffer+command_length, ':');
u32 len = HexToInt(start_offset, len_pos - start_offset);
u8* dst = Memory::GetPointer(addr);
if (!dst) {
return SendReply("E00");
}
GdbHexToMem(dst, len_pos + 1, len);
SendReply("OK");
}
void Break(bool is_memory_break) {
if (!halt_loop) {
halt_loop = true;
SendSignal(SIGTRAP);
}
memory_break = is_memory_break;
}
/// Tell the CPU that it should perform a single step.
static void Step() {
step_loop = true;
halt_loop = true;
step_break = true;
SendSignal(SIGTRAP);
}
bool IsMemoryBreak() {
if (IsConnected()) {
return false;
}
return memory_break;
}
/// Tell the CPU to continue executing.
static void Continue() {
memory_break = false;
step_break = false;
step_loop = false;
halt_loop = false;
}
/**
* Commit breakpoint to list of breakpoints.
*
* @param type Type of breakpoint.
* @param addr Address of breakpoint.
* @param len Length of breakpoint.
*/
bool CommitBreakpoint(BreakpointType type, PAddr addr, u32 len) {
std::map<u32, Breakpoint>& p = GetBreakpointList(type);
Breakpoint breakpoint;
breakpoint.active = true;
breakpoint.addr = addr;
breakpoint.len = len;
p.insert({ addr, breakpoint });
LOG_DEBUG(Debug_GDBStub, "gdb: added %d breakpoint: %08x bytes at %08x\n", type, breakpoint.len, breakpoint.addr);
return true;
}
/// Handle add breakpoint command from gdb client.
static void AddBreakpoint() {
BreakpointType type;
u8 type_id = HexCharToValue(command_buffer[1]);
switch (type_id) {
case 0:
case 1:
type = BreakpointType::Execute;
break;
case 2:
type = BreakpointType::Write;
break;
case 3:
type = BreakpointType::Read;
break;
case 4:
type = BreakpointType::Access;
break;
default:
return SendReply("E01");
}
auto start_offset = command_buffer+3;
auto addr_pos = std::find(start_offset, command_buffer+command_length, ',');
PAddr addr = HexToInt(start_offset, addr_pos - start_offset);
start_offset = addr_pos+1;
u32 len = HexToInt(start_offset, (command_buffer + command_length) - start_offset);
if (type == BreakpointType::Access) {
// Access is made up of Read and Write types, so add both breakpoints
type = BreakpointType::Read;
if (!CommitBreakpoint(type, addr, len)) {
return SendReply("E02");
}
type = BreakpointType::Write;
}
if (!CommitBreakpoint(type, addr, len)) {
return SendReply("E02");
}
SendReply("OK");
}
/// Handle remove breakpoint command from gdb client.
static void RemoveBreakpoint() {
BreakpointType type;
u8 type_id = HexCharToValue(command_buffer[1]);
switch (type_id) {
case 0:
case 1:
type = BreakpointType::Execute;
break;
case 2:
type = BreakpointType::Write;
break;
case 3:
type = BreakpointType::Read;
break;
case 4:
type = BreakpointType::Access;
break;
default:
return SendReply("E01");
}
auto start_offset = command_buffer+3;
auto addr_pos = std::find(start_offset, command_buffer+command_length, ',');
PAddr addr = HexToInt(start_offset, addr_pos - start_offset);
start_offset = addr_pos+1;
u32 len = HexToInt(start_offset, (command_buffer + command_length) - start_offset);
if (type == BreakpointType::Access) {
// Access is made up of Read and Write types, so add both breakpoints
type = BreakpointType::Read;
RemoveBreakpoint(type, addr);
type = BreakpointType::Write;
}
RemoveBreakpoint(type, addr);
SendReply("OK");
}
void HandlePacket() {
if (!IsConnected()) {
return;
}
if (!IsDataAvailable()) {
return;
}
ReadCommand();
if (command_length == 0) {
return;
}
LOG_DEBUG(Debug_GDBStub, "Packet: %s", command_buffer);
switch (command_buffer[0]) {
case 'q':
HandleQuery();
break;
case 'H':
HandleSetThread();
break;
case '?':
SendSignal(latest_signal);
break;
case 'k':
Shutdown();
LOG_INFO(Debug_GDBStub, "killed by gdb");
return;
case 'g':
ReadRegisters();
break;
case 'G':
WriteRegisters();
break;
case 'p':
ReadRegister();
break;
case 'P':
WriteRegister();
break;
case 'm':
ReadMemory();
break;
case 'M':
WriteMemory();
break;
case 's':
Step();
return;
case 'C':
case 'c':
Continue();
return;
case 'z':
RemoveBreakpoint();
break;
case 'Z':
AddBreakpoint();
break;
default:
SendReply("");
break;
}
}
void SetServerPort(u16 port) {
gdbstub_port = port;
}
void ToggleServer(bool status) {
if (status) {
g_server_enabled = status;
// Start server
if (!IsConnected() && Core::g_sys_core != nullptr) {
Init();
}
}
else {
// Stop server
if (IsConnected()) {
Shutdown();
}
g_server_enabled = status;
}
}
void Init(u16 port) {
if (!g_server_enabled) {
// Set the halt loop to false in case the user enabled the gdbstub mid-execution.
// This way the CPU can still execute normally.
halt_loop = false;
step_loop = false;
return;
}
// Setup initial gdbstub status
halt_loop = true;
step_loop = false;
breakpoints_execute.clear();
breakpoints_read.clear();
breakpoints_write.clear();
// Start gdb server
LOG_INFO(Debug_GDBStub, "Starting GDB server on port %d...", port);
sockaddr_in saddr_server = {};
saddr_server.sin_family = AF_INET;
saddr_server.sin_port = htons(port);
saddr_server.sin_addr.s_addr = INADDR_ANY;
#ifdef _WIN32
WSAStartup(MAKEWORD(2, 2), &InitData);
#endif
int tmpsock = socket(PF_INET, SOCK_STREAM, 0);
if (tmpsock == -1) {
LOG_ERROR(Debug_GDBStub, "Failed to create gdb socket");
}
const sockaddr* server_addr = reinterpret_cast<const sockaddr*>(&saddr_server);
socklen_t server_addrlen = sizeof(saddr_server);
if (bind(tmpsock, server_addr, server_addrlen) < 0) {
LOG_ERROR(Debug_GDBStub, "Failed to bind gdb socket");
}
if (listen(tmpsock, 1) < 0) {
LOG_ERROR(Debug_GDBStub, "Failed to listen to gdb socket");
}
// Wait for gdb to connect
LOG_INFO(Debug_GDBStub, "Waiting for gdb to connect...\n");
sockaddr_in saddr_client;
sockaddr* client_addr = reinterpret_cast<sockaddr*>(&saddr_client);
socklen_t client_addrlen = sizeof(saddr_client);
gdbserver_socket = accept(tmpsock, client_addr, &client_addrlen);
if (gdbserver_socket < 0) {
// In the case that we couldn't start the server for whatever reason, just start CPU execution like normal.
halt_loop = false;
step_loop = false;
LOG_ERROR(Debug_GDBStub, "Failed to accept gdb client");
}
else {
LOG_INFO(Debug_GDBStub, "Client connected.\n");
saddr_client.sin_addr.s_addr = ntohl(saddr_client.sin_addr.s_addr);
}
// Clean up temporary socket if it's still alive at this point.
if (tmpsock != -1) {
shutdown(tmpsock, SHUT_RDWR);
}
}
void Init() {
Init(gdbstub_port);
}
void Shutdown() {
if (!g_server_enabled) {
return;
}
LOG_INFO(Debug_GDBStub, "Stopping GDB ...");
if (gdbserver_socket != -1) {
shutdown(gdbserver_socket, SHUT_RDWR);
gdbserver_socket = -1;
}
#ifdef _WIN32
WSACleanup();
#endif
LOG_INFO(Debug_GDBStub, "GDB stopped.");
}
bool IsConnected() {
return g_server_enabled && gdbserver_socket != -1;
}
bool GetCpuHaltFlag() {
return halt_loop;
}
bool GetCpuStepFlag() {
return step_loop;
}
void SetCpuStepFlag(bool is_step) {
step_loop = is_step;
}
};

94
src/core/gdbstub/gdbstub.h Normal file
View file

@ -0,0 +1,94 @@
// Copyright 2013 Dolphin Emulator Project
// Licensed under GPLv2+
// Refer to the license.txt file included.
// Originally written by Sven Peter <sven@fail0verflow.com> for anergistic.
#pragma once
#include <atomic>
namespace GDBStub {
/// Breakpoint Method
enum class BreakpointType {
None, ///< None
Execute, ///< Execution Breakpoint
Read, ///< Read Breakpoint
Write, ///< Write Breakpoint
Access ///< Access (R/W) Breakpoint
};
struct BreakpointAddress {
PAddr address;
BreakpointType type;
};
/// If set to false, the server will never be started and no gdbstub-related functions will be executed.
extern std::atomic<bool> g_server_enabled;
/**
* Set the port the gdbstub should use to listen for connections.
*
* @param port Port to listen for connection
*/
void SetServerPort(u16 port);
/**
* Set the g_server_enabled flag and start or stop the server if possible.
*
* @param status Set the server to enabled or disabled.
*/
void ToggleServer(bool status);
/// Start the gdbstub server.
void Init();
/// Stop gdbstub server.
void Shutdown();
/// Returns true if there is an active socket connection.
bool IsConnected();
/**
* Signal to the gdbstub server that it should halt CPU execution.
*
* @param is_memory_break If true, the break resulted from a memory breakpoint.
*/
void Break(bool is_memory_break = false);
/// Determine if there was a memory breakpoint.
bool IsMemoryBreak();
/// Read and handle packet from gdb client.
void HandlePacket();
/**
* Get the nearest breakpoint of the specified type at the given address.
*
* @param addr Address to search from.
* @param type Type of breakpoint.
*/
BreakpointAddress GetNextBreakpointFromAddress(u32 addr, GDBStub::BreakpointType type);
/**
* Check if a breakpoint of the specified type exists at the given address.
*
* @param addr Address of breakpoint.
* @param type Type of breakpoint.
*/
bool CheckBreakpoint(u32 addr, GDBStub::BreakpointType type);
// 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.
bool GetCpuStepFlag();
/**
* When set to true, the CPU will step one instruction when the CPU is halted next.
*
* @param is_step
*/
void SetCpuStepFlag(bool is_step);
}

5
src/core/settings.h
View file

@ -6,6 +6,7 @@
#include <string>
#include <array>
#include <common/file_util.h>
namespace Settings {
@ -60,6 +61,10 @@ struct Values {
float bg_blue;
std::string log_filter;
// Debugging
bool use_gdbstub;
u16 gdbstub_port;
} extern values;
}

4
src/core/system.cpp
View file

@ -12,6 +12,8 @@
#include "video_core/video_core.h"
#include "core/gdbstub/gdbstub.h"
namespace System {
void Init(EmuWindow* emu_window) {
@ -22,9 +24,11 @@ void Init(EmuWindow* emu_window) {
Kernel::Init();
HLE::Init();
VideoCore::Init(emu_window);
GDBStub::Init();
}
void Shutdown() {
GDBStub::Shutdown();
VideoCore::Shutdown();
HLE::Shutdown();
Kernel::Shutdown();