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yuzu/src/core/debugger/gdbstub.cpp

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// SPDX-FileCopyrightText: Copyright 2022 yuzu Emulator Project
// SPDX-License-Identifier: GPL-2.0-or-later
#include <atomic>
#include <numeric>
#include <optional>
#include <thread>
#include <boost/algorithm/string.hpp>
#include "common/hex_util.h"
#include "common/logging/log.h"
#include "common/scope_exit.h"
#include "common/settings.h"
#include "core/arm/arm_interface.h"
#include "core/core.h"
#include "core/debugger/gdbstub.h"
#include "core/debugger/gdbstub_arch.h"
#include "core/hle/kernel/k_page_table.h"
#include "core/hle/kernel/k_process.h"
#include "core/hle/kernel/k_thread.h"
#include "core/loader/loader.h"
#include "core/memory.h"
namespace Core {
constexpr char GDB_STUB_START = '$';
constexpr char GDB_STUB_END = '#';
constexpr char GDB_STUB_ACK = '+';
constexpr char GDB_STUB_NACK = '-';
constexpr char GDB_STUB_INT3 = 0x03;
constexpr int GDB_STUB_SIGTRAP = 5;
constexpr char GDB_STUB_REPLY_ERR[] = "E01";
constexpr char GDB_STUB_REPLY_OK[] = "OK";
constexpr char GDB_STUB_REPLY_EMPTY[] = "";
static u8 CalculateChecksum(std::string_view data) {
return std::accumulate(data.begin(), data.end(), u8{0},
[](u8 lhs, u8 rhs) { return static_cast<u8>(lhs + rhs); });
}
static std::string EscapeGDB(std::string_view data) {
std::string escaped;
escaped.reserve(data.size());
for (char c : data) {
switch (c) {
case '#':
escaped += "}\x03";
break;
case '$':
escaped += "}\x04";
break;
case '*':
escaped += "}\x0a";
break;
case '}':
escaped += "}\x5d";
break;
default:
escaped += c;
break;
}
}
return escaped;
}
static std::string EscapeXML(std::string_view data) {
std::string escaped;
escaped.reserve(data.size());
for (char c : data) {
switch (c) {
case '&':
escaped += "&amp;";
break;
case '"':
escaped += "&quot;";
break;
case '<':
escaped += "&lt;";
break;
case '>':
escaped += "&gt;";
break;
default:
escaped += c;
break;
}
}
return escaped;
}
GDBStub::GDBStub(DebuggerBackend& backend_, Core::System& system_)
: DebuggerFrontend(backend_), system{system_} {
if (system.ApplicationProcess()->Is64BitProcess()) {
arch = std::make_unique<GDBStubA64>();
} else {
arch = std::make_unique<GDBStubA32>();
}
}
GDBStub::~GDBStub() = default;
void GDBStub::Connected() {}
void GDBStub::ShuttingDown() {}
void GDBStub::Stopped(Kernel::KThread* thread) {
SendReply(arch->ThreadStatus(thread, GDB_STUB_SIGTRAP));
}
void GDBStub::Watchpoint(Kernel::KThread* thread, const Kernel::DebugWatchpoint& watch) {
const auto status{arch->ThreadStatus(thread, GDB_STUB_SIGTRAP)};
switch (watch.type) {
case Kernel::DebugWatchpointType::Read:
SendReply(fmt::format("{}rwatch:{:x};", status, GetInteger(watch.start_address)));
break;
case Kernel::DebugWatchpointType::Write:
SendReply(fmt::format("{}watch:{:x};", status, GetInteger(watch.start_address)));
break;
case Kernel::DebugWatchpointType::ReadOrWrite:
default:
SendReply(fmt::format("{}awatch:{:x};", status, GetInteger(watch.start_address)));
break;
}
}
std::vector<DebuggerAction> GDBStub::ClientData(std::span<const u8> data) {
std::vector<DebuggerAction> actions;
current_command.insert(current_command.end(), data.begin(), data.end());
while (current_command.size() != 0) {
ProcessData(actions);
}
return actions;
}
void GDBStub::ProcessData(std::vector<DebuggerAction>& actions) {
const char c{current_command[0]};
// Acknowledgement
if (c == GDB_STUB_ACK || c == GDB_STUB_NACK) {
current_command.erase(current_command.begin());
return;
}
// Interrupt
if (c == GDB_STUB_INT3) {
LOG_INFO(Debug_GDBStub, "Received interrupt");
current_command.erase(current_command.begin());
actions.push_back(DebuggerAction::Interrupt);
SendStatus(GDB_STUB_ACK);
return;
}
// Otherwise, require the data to be the start of a command
if (c != GDB_STUB_START) {
LOG_ERROR(Debug_GDBStub, "Invalid command buffer contents: {}", current_command.data());
current_command.clear();
SendStatus(GDB_STUB_NACK);
return;
}
// Continue reading until command is complete
while (CommandEnd() == current_command.end()) {
const auto new_data{backend.ReadFromClient()};
current_command.insert(current_command.end(), new_data.begin(), new_data.end());
}
// Execute and respond to GDB
const auto command{DetachCommand()};
if (command) {
SendStatus(GDB_STUB_ACK);
ExecuteCommand(*command, actions);
} else {
SendStatus(GDB_STUB_NACK);
}
}
void GDBStub::ExecuteCommand(std::string_view packet, std::vector<DebuggerAction>& actions) {
LOG_TRACE(Debug_GDBStub, "Executing command: {}", packet);
if (packet.length() == 0) {
SendReply(GDB_STUB_REPLY_ERR);
return;
}
if (packet.starts_with("vCont")) {
HandleVCont(packet.substr(5), actions);
return;
}
std::string_view command{packet.substr(1, packet.size())};
switch (packet[0]) {
case 'H': {
Kernel::KThread* thread{nullptr};
s64 thread_id{strtoll(command.data() + 1, nullptr, 16)};
if (thread_id >= 1) {
thread = GetThreadByID(thread_id);
} else {
thread = backend.GetActiveThread();
}
if (thread) {
SendReply(GDB_STUB_REPLY_OK);
backend.SetActiveThread(thread);
} else {
SendReply(GDB_STUB_REPLY_ERR);
}
break;
}
case 'T': {
s64 thread_id{strtoll(command.data(), nullptr, 16)};
if (GetThreadByID(thread_id)) {
SendReply(GDB_STUB_REPLY_OK);
} else {
SendReply(GDB_STUB_REPLY_ERR);
}
break;
}
case 'Q':
case 'q':
HandleQuery(command);
break;
case '?':
SendReply(arch->ThreadStatus(backend.GetActiveThread(), GDB_STUB_SIGTRAP));
break;
case 'k':
LOG_INFO(Debug_GDBStub, "Shutting down emulation");
actions.push_back(DebuggerAction::ShutdownEmulation);
break;
case 'g':
SendReply(arch->ReadRegisters(backend.GetActiveThread()));
break;
case 'G':
arch->WriteRegisters(backend.GetActiveThread(), command);
SendReply(GDB_STUB_REPLY_OK);
break;
case 'p': {
const size_t reg{static_cast<size_t>(strtoll(command.data(), nullptr, 16))};
SendReply(arch->RegRead(backend.GetActiveThread(), reg));
break;
}
case 'P': {
const auto sep{std::find(command.begin(), command.end(), '=') - command.begin() + 1};
const size_t reg{static_cast<size_t>(strtoll(command.data(), nullptr, 16))};
arch->RegWrite(backend.GetActiveThread(), reg, std::string_view(command).substr(sep));
SendReply(GDB_STUB_REPLY_OK);
break;
}
case 'm': {
const auto sep{std::find(command.begin(), command.end(), ',') - command.begin() + 1};
const size_t addr{static_cast<size_t>(strtoll(command.data(), nullptr, 16))};
const size_t size{static_cast<size_t>(strtoll(command.data() + sep, nullptr, 16))};
if (system.ApplicationMemory().IsValidVirtualAddressRange(addr, size)) {
std::vector<u8> mem(size);
system.ApplicationMemory().ReadBlock(addr, mem.data(), size);
SendReply(Common::HexToString(mem));
} else {
SendReply(GDB_STUB_REPLY_ERR);
}
break;
}
case 'M': {
const auto size_sep{std::find(command.begin(), command.end(), ',') - command.begin() + 1};
const auto mem_sep{std::find(command.begin(), command.end(), ':') - command.begin() + 1};
const size_t addr{static_cast<size_t>(strtoll(command.data(), nullptr, 16))};
const size_t size{static_cast<size_t>(strtoll(command.data() + size_sep, nullptr, 16))};
const auto mem_substr{std::string_view(command).substr(mem_sep)};
const auto mem{Common::HexStringToVector(mem_substr, false)};
if (system.ApplicationMemory().IsValidVirtualAddressRange(addr, size)) {
system.ApplicationMemory().WriteBlock(addr, mem.data(), size);
system.InvalidateCpuInstructionCacheRange(addr, size);
SendReply(GDB_STUB_REPLY_OK);
} else {
SendReply(GDB_STUB_REPLY_ERR);
}
break;
}
case 's':
actions.push_back(DebuggerAction::StepThreadLocked);
break;
case 'C':
case 'c':
actions.push_back(DebuggerAction::Continue);
break;
case 'Z':
HandleBreakpointInsert(command);
break;
case 'z':
HandleBreakpointRemove(command);
break;
default:
SendReply(GDB_STUB_REPLY_EMPTY);
break;
}
}
enum class BreakpointType {
Software = 0,
Hardware = 1,
WriteWatch = 2,
ReadWatch = 3,
AccessWatch = 4,
};
void GDBStub::HandleBreakpointInsert(std::string_view command) {
const auto type{static_cast<BreakpointType>(strtoll(command.data(), nullptr, 16))};
const auto addr_sep{std::find(command.begin(), command.end(), ',') - command.begin() + 1};
const auto size_sep{std::find(command.begin() + addr_sep, command.end(), ',') -
command.begin() + 1};
const size_t addr{static_cast<size_t>(strtoll(command.data() + addr_sep, nullptr, 16))};
const size_t size{static_cast<size_t>(strtoll(command.data() + size_sep, nullptr, 16))};
if (!system.ApplicationMemory().IsValidVirtualAddressRange(addr, size)) {
SendReply(GDB_STUB_REPLY_ERR);
return;
}
bool success{};
switch (type) {
case BreakpointType::Software:
replaced_instructions[addr] = system.ApplicationMemory().Read32(addr);
system.ApplicationMemory().Write32(addr, arch->BreakpointInstruction());
system.InvalidateCpuInstructionCacheRange(addr, sizeof(u32));
success = true;
break;
case BreakpointType::WriteWatch:
success = system.ApplicationProcess()->InsertWatchpoint(addr, size,
Kernel::DebugWatchpointType::Write);
break;
case BreakpointType::ReadWatch:
success = system.ApplicationProcess()->InsertWatchpoint(addr, size,
Kernel::DebugWatchpointType::Read);
break;
case BreakpointType::AccessWatch:
success = system.ApplicationProcess()->InsertWatchpoint(
addr, size, Kernel::DebugWatchpointType::ReadOrWrite);
break;
case BreakpointType::Hardware:
default:
SendReply(GDB_STUB_REPLY_EMPTY);
return;
}
if (success) {
SendReply(GDB_STUB_REPLY_OK);
} else {
SendReply(GDB_STUB_REPLY_ERR);
}
}
void GDBStub::HandleBreakpointRemove(std::string_view command) {
const auto type{static_cast<BreakpointType>(strtoll(command.data(), nullptr, 16))};
const auto addr_sep{std::find(command.begin(), command.end(), ',') - command.begin() + 1};
const auto size_sep{std::find(command.begin() + addr_sep, command.end(), ',') -
command.begin() + 1};
const size_t addr{static_cast<size_t>(strtoll(command.data() + addr_sep, nullptr, 16))};
const size_t size{static_cast<size_t>(strtoll(command.data() + size_sep, nullptr, 16))};
if (!system.ApplicationMemory().IsValidVirtualAddressRange(addr, size)) {
SendReply(GDB_STUB_REPLY_ERR);
return;
}
bool success{};
switch (type) {
case BreakpointType::Software: {
const auto orig_insn{replaced_instructions.find(addr)};
if (orig_insn != replaced_instructions.end()) {
system.ApplicationMemory().Write32(addr, orig_insn->second);
system.InvalidateCpuInstructionCacheRange(addr, sizeof(u32));
replaced_instructions.erase(addr);
success = true;
}
break;
}
case BreakpointType::WriteWatch:
success = system.ApplicationProcess()->RemoveWatchpoint(addr, size,
Kernel::DebugWatchpointType::Write);
break;
case BreakpointType::ReadWatch:
success = system.ApplicationProcess()->RemoveWatchpoint(addr, size,
Kernel::DebugWatchpointType::Read);
break;
case BreakpointType::AccessWatch:
success = system.ApplicationProcess()->RemoveWatchpoint(
addr, size, Kernel::DebugWatchpointType::ReadOrWrite);
break;
case BreakpointType::Hardware:
default:
SendReply(GDB_STUB_REPLY_EMPTY);
return;
}
if (success) {
SendReply(GDB_STUB_REPLY_OK);
} else {
SendReply(GDB_STUB_REPLY_ERR);
}
}
// Structure offsets are from Atmosphere
// See osdbg_thread_local_region.os.horizon.hpp and osdbg_thread_type.os.horizon.hpp
static std::optional<std::string> GetNameFromThreadType32(Core::Memory::Memory& memory,
const Kernel::KThread* thread) {
// Read thread type from TLS
const VAddr tls_thread_type{memory.Read32(thread->GetTlsAddress() + 0x1fc)};
const VAddr argument_thread_type{thread->GetArgument()};
if (argument_thread_type && tls_thread_type != argument_thread_type) {
// Probably not created by nnsdk, no name available.
return std::nullopt;
}
if (!tls_thread_type) {
return std::nullopt;
}
const u16 version{memory.Read16(tls_thread_type + 0x26)};
VAddr name_pointer{};
if (version == 1) {
name_pointer = memory.Read32(tls_thread_type + 0xe4);
} else {
name_pointer = memory.Read32(tls_thread_type + 0xe8);
}
if (!name_pointer) {
// No name provided.
return std::nullopt;
}
return memory.ReadCString(name_pointer, 256);
}
static std::optional<std::string> GetNameFromThreadType64(Core::Memory::Memory& memory,
const Kernel::KThread* thread) {
// Read thread type from TLS
const VAddr tls_thread_type{memory.Read64(thread->GetTlsAddress() + 0x1f8)};
const VAddr argument_thread_type{thread->GetArgument()};
if (argument_thread_type && tls_thread_type != argument_thread_type) {
// Probably not created by nnsdk, no name available.
return std::nullopt;
}
if (!tls_thread_type) {
return std::nullopt;
}
const u16 version{memory.Read16(tls_thread_type + 0x46)};
VAddr name_pointer{};
if (version == 1) {
name_pointer = memory.Read64(tls_thread_type + 0x1a0);
} else {
name_pointer = memory.Read64(tls_thread_type + 0x1a8);
}
if (!name_pointer) {
// No name provided.
return std::nullopt;
}
return memory.ReadCString(name_pointer, 256);
}
static std::optional<std::string> GetThreadName(Core::System& system,
const Kernel::KThread* thread) {
if (system.ApplicationProcess()->Is64BitProcess()) {
return GetNameFromThreadType64(system.ApplicationMemory(), thread);
} else {
return GetNameFromThreadType32(system.ApplicationMemory(), thread);
}
}
static std::string_view GetThreadWaitReason(const Kernel::KThread* thread) {
switch (thread->GetWaitReasonForDebugging()) {
case Kernel::ThreadWaitReasonForDebugging::Sleep:
return "Sleep";
case Kernel::ThreadWaitReasonForDebugging::IPC:
return "IPC";
case Kernel::ThreadWaitReasonForDebugging::Synchronization:
return "Synchronization";
case Kernel::ThreadWaitReasonForDebugging::ConditionVar:
return "ConditionVar";
case Kernel::ThreadWaitReasonForDebugging::Arbitration:
return "Arbitration";
case Kernel::ThreadWaitReasonForDebugging::Suspended:
return "Suspended";
default:
return "Unknown";
}
}
static std::string GetThreadState(const Kernel::KThread* thread) {
switch (thread->GetState()) {
case Kernel::ThreadState::Initialized:
return "Initialized";
case Kernel::ThreadState::Waiting:
return fmt::format("Waiting ({})", GetThreadWaitReason(thread));
case Kernel::ThreadState::Runnable:
return "Runnable";
case Kernel::ThreadState::Terminated:
return "Terminated";
default:
return "Unknown";
}
}
static std::string PaginateBuffer(std::string_view buffer, std::string_view request) {
const auto amount{request.substr(request.find(',') + 1)};
const auto offset_val{static_cast<u64>(strtoll(request.data(), nullptr, 16))};
const auto amount_val{static_cast<u64>(strtoll(amount.data(), nullptr, 16))};
if (offset_val + amount_val > buffer.size()) {
return fmt::format("l{}", buffer.substr(offset_val));
} else {
return fmt::format("m{}", buffer.substr(offset_val, amount_val));
}
}
void GDBStub::HandleQuery(std::string_view command) {
if (command.starts_with("TStatus")) {
// no tracepoint support
SendReply("T0");
} else if (command.starts_with("Supported")) {
SendReply("PacketSize=4000;qXfer:features:read+;qXfer:threads:read+;qXfer:libraries:read+;"
"vContSupported+;QStartNoAckMode+");
} else if (command.starts_with("Xfer:features:read:target.xml:")) {
const auto target_xml{arch->GetTargetXML()};
SendReply(PaginateBuffer(target_xml, command.substr(30)));
} else if (command.starts_with("Offsets")) {
Loader::AppLoader::Modules modules;
system.GetAppLoader().ReadNSOModules(modules);
const auto main = std::find_if(modules.begin(), modules.end(),
[](const auto& key) { return key.second == "main"; });
if (main != modules.end()) {
SendReply(fmt::format("TextSeg={:x}", main->first));
} else {
SendReply(fmt::format(
"TextSeg={:x}",
GetInteger(system.ApplicationProcess()->PageTable().GetCodeRegionStart())));
}
} else if (command.starts_with("Xfer:libraries:read::")) {
Loader::AppLoader::Modules modules;
system.GetAppLoader().ReadNSOModules(modules);
std::string buffer;
buffer += R"(<?xml version="1.0"?>)";
buffer += "<library-list>";
for (const auto& [base, name] : modules) {
buffer += fmt::format(R"(<library name="{}"><segment address="{:#x}"/></library>)",
EscapeXML(name), base);
}
buffer += "</library-list>";
SendReply(PaginateBuffer(buffer, command.substr(21)));
} else if (command.starts_with("fThreadInfo")) {
// beginning of list
const auto& threads = system.ApplicationProcess()->GetThreadList();
std::vector<std::string> thread_ids;
for (const auto& thread : threads) {
thread_ids.push_back(fmt::format("{:x}", thread->GetThreadId()));
}
SendReply(fmt::format("m{}", fmt::join(thread_ids, ",")));
} else if (command.starts_with("sThreadInfo")) {
// end of list
SendReply("l");
} else if (command.starts_with("Xfer:threads:read::")) {
std::string buffer;
buffer += R"(<?xml version="1.0"?>)";
buffer += "<threads>";
const auto& threads = system.ApplicationProcess()->GetThreadList();
for (const auto* thread : threads) {
auto thread_name{GetThreadName(system, thread)};
if (!thread_name) {
thread_name = fmt::format("Thread {:d}", thread->GetThreadId());
}
buffer += fmt::format(R"(<thread id="{:x}" core="{:d}" name="{}">{}</thread>)",
thread->GetThreadId(), thread->GetActiveCore(),
EscapeXML(*thread_name), GetThreadState(thread));
}
buffer += "</threads>";
SendReply(PaginateBuffer(buffer, command.substr(19)));
} else if (command.starts_with("Attached")) {
SendReply("0");
} else if (command.starts_with("StartNoAckMode")) {
no_ack = true;
SendReply(GDB_STUB_REPLY_OK);
} else if (command.starts_with("Rcmd,")) {
HandleRcmd(Common::HexStringToVector(command.substr(5), false));
} else {
SendReply(GDB_STUB_REPLY_EMPTY);
}
}
void GDBStub::HandleVCont(std::string_view command, std::vector<DebuggerAction>& actions) {
if (command == "?") {
// Continuing and stepping are supported
// (signal is ignored, but required for GDB to use vCont)
SendReply("vCont;c;C;s;S");
return;
}
Kernel::KThread* stepped_thread{nullptr};
bool lock_execution{true};
std::vector<std::string> entries;
boost::split(entries, command.substr(1), boost::is_any_of(";"));
for (const auto& thread_action : entries) {
std::vector<std::string> parts;
boost::split(parts, thread_action, boost::is_any_of(":"));
if (parts.size() == 1 && (parts[0] == "c" || parts[0].starts_with("C"))) {
lock_execution = false;
}
if (parts.size() == 2 && (parts[0] == "s" || parts[0].starts_with("S"))) {
stepped_thread = GetThreadByID(strtoll(parts[1].data(), nullptr, 16));
}
}
if (stepped_thread) {
backend.SetActiveThread(stepped_thread);
actions.push_back(lock_execution ? DebuggerAction::StepThreadLocked
: DebuggerAction::StepThreadUnlocked);
} else {
actions.push_back(DebuggerAction::Continue);
}
}
constexpr std::array<std::pair<const char*, Kernel::Svc::MemoryState>, 22> MemoryStateNames{{
{"----- Free -----", Kernel::Svc::MemoryState::Free},
{"Io ", Kernel::Svc::MemoryState::Io},
{"Static ", Kernel::Svc::MemoryState::Static},
{"Code ", Kernel::Svc::MemoryState::Code},
{"CodeData ", Kernel::Svc::MemoryState::CodeData},
{"Normal ", Kernel::Svc::MemoryState::Normal},
{"Shared ", Kernel::Svc::MemoryState::Shared},
{"AliasCode ", Kernel::Svc::MemoryState::AliasCode},
{"AliasCodeData ", Kernel::Svc::MemoryState::AliasCodeData},
{"Ipc ", Kernel::Svc::MemoryState::Ipc},
{"Stack ", Kernel::Svc::MemoryState::Stack},
{"ThreadLocal ", Kernel::Svc::MemoryState::ThreadLocal},
{"Transfered ", Kernel::Svc::MemoryState::Transfered},
{"SharedTransfered", Kernel::Svc::MemoryState::SharedTransfered},
{"SharedCode ", Kernel::Svc::MemoryState::SharedCode},
{"Inaccessible ", Kernel::Svc::MemoryState::Inaccessible},
{"NonSecureIpc ", Kernel::Svc::MemoryState::NonSecureIpc},
{"NonDeviceIpc ", Kernel::Svc::MemoryState::NonDeviceIpc},
{"Kernel ", Kernel::Svc::MemoryState::Kernel},
{"GeneratedCode ", Kernel::Svc::MemoryState::GeneratedCode},
{"CodeOut ", Kernel::Svc::MemoryState::CodeOut},
{"Coverage ", Kernel::Svc::MemoryState::Coverage},
}};
static constexpr const char* GetMemoryStateName(Kernel::Svc::MemoryState state) {
for (size_t i = 0; i < MemoryStateNames.size(); i++) {
if (std::get<1>(MemoryStateNames[i]) == state) {
return std::get<0>(MemoryStateNames[i]);
}
}
return "Unknown ";
}
static constexpr const char* GetMemoryPermissionString(const Kernel::Svc::MemoryInfo& info) {
if (info.state == Kernel::Svc::MemoryState::Free) {
return " ";
}
switch (info.permission) {
case Kernel::Svc::MemoryPermission::ReadExecute:
return "r-x";
case Kernel::Svc::MemoryPermission::Read:
return "r--";
case Kernel::Svc::MemoryPermission::ReadWrite:
return "rw-";
default:
return "---";
}
}
static VAddr GetModuleEnd(Kernel::KPageTable& page_table, VAddr base) {
Kernel::Svc::MemoryInfo mem_info;
VAddr cur_addr{base};
// Expect: r-x Code (.text)
mem_info = page_table.QueryInfo(cur_addr).GetSvcMemoryInfo();
cur_addr = mem_info.base_address + mem_info.size;
if (mem_info.state != Kernel::Svc::MemoryState::Code ||
mem_info.permission != Kernel::Svc::MemoryPermission::ReadExecute) {
return cur_addr - 1;
}
// Expect: r-- Code (.rodata)
mem_info = page_table.QueryInfo(cur_addr).GetSvcMemoryInfo();
cur_addr = mem_info.base_address + mem_info.size;
if (mem_info.state != Kernel::Svc::MemoryState::Code ||
mem_info.permission != Kernel::Svc::MemoryPermission::Read) {
return cur_addr - 1;
}
// Expect: rw- CodeData (.data)
mem_info = page_table.QueryInfo(cur_addr).GetSvcMemoryInfo();
cur_addr = mem_info.base_address + mem_info.size;
return cur_addr - 1;
}
void GDBStub::HandleRcmd(const std::vector<u8>& command) {
std::string_view command_str{reinterpret_cast<const char*>(&command[0]), command.size()};
std::string reply;
auto* process = system.ApplicationProcess();
auto& page_table = process->PageTable();
const char* commands = "Commands:\n"
" get fastmem\n"
" get info\n"
" get mappings\n";
if (command_str == "get fastmem") {
if (Settings::IsFastmemEnabled()) {
const auto& impl = page_table.PageTableImpl();
const auto region = reinterpret_cast<uintptr_t>(impl.fastmem_arena);
const auto region_bits = impl.current_address_space_width_in_bits;
const auto region_size = 1ULL << region_bits;
reply = fmt::format("Region bits: {}\n"
"Host address: {:#x} - {:#x}\n",
region_bits, region, region + region_size - 1);
} else {
reply = "Fastmem is not enabled.\n";
}
} else if (command_str == "get info") {
Loader::AppLoader::Modules modules;
system.GetAppLoader().ReadNSOModules(modules);
reply = fmt::format("Process: {:#x} ({})\n"
"Program Id: {:#018x}\n",
process->GetProcessId(), process->GetName(), process->GetProgramId());
reply += fmt::format("Layout:\n"
" Alias: {:#012x} - {:#012x}\n"
" Heap: {:#012x} - {:#012x}\n"
" Aslr: {:#012x} - {:#012x}\n"
" Stack: {:#012x} - {:#012x}\n"
"Modules:\n",
GetInteger(page_table.GetAliasRegionStart()),
GetInteger(page_table.GetAliasRegionEnd()),
GetInteger(page_table.GetHeapRegionStart()),
GetInteger(page_table.GetHeapRegionEnd()),
GetInteger(page_table.GetAliasCodeRegionStart()),
GetInteger(page_table.GetAliasCodeRegionEnd()),
GetInteger(page_table.GetStackRegionStart()),
GetInteger(page_table.GetStackRegionEnd()));
for (const auto& [vaddr, name] : modules) {
reply += fmt::format(" {:#012x} - {:#012x} {}\n", vaddr,
GetModuleEnd(page_table, vaddr), name);
}
} else if (command_str == "get mappings") {
reply = "Mappings:\n";
VAddr cur_addr = 0;
while (true) {
using MemoryAttribute = Kernel::Svc::MemoryAttribute;
auto mem_info = page_table.QueryInfo(cur_addr).GetSvcMemoryInfo();
if (mem_info.state != Kernel::Svc::MemoryState::Inaccessible ||
mem_info.base_address + mem_info.size - 1 != std::numeric_limits<u64>::max()) {
const char* state = GetMemoryStateName(mem_info.state);
const char* perm = GetMemoryPermissionString(mem_info);
const char l = True(mem_info.attribute & MemoryAttribute::Locked) ? 'L' : '-';
const char i = True(mem_info.attribute & MemoryAttribute::IpcLocked) ? 'I' : '-';
const char d = True(mem_info.attribute & MemoryAttribute::DeviceShared) ? 'D' : '-';
const char u = True(mem_info.attribute & MemoryAttribute::Uncached) ? 'U' : '-';
reply +=
fmt::format(" {:#012x} - {:#012x} {} {} {}{}{}{} [{}, {}]\n",
mem_info.base_address, mem_info.base_address + mem_info.size - 1,
perm, state, l, i, d, u, mem_info.ipc_count, mem_info.device_count);
}
const uintptr_t next_address = mem_info.base_address + mem_info.size;
if (next_address <= cur_addr) {
break;
}
cur_addr = next_address;
}
} else if (command_str == "help") {
reply = commands;
} else {
reply = "Unknown command.\n";
reply += commands;
}
std::span<const u8> reply_span{reinterpret_cast<u8*>(&reply.front()), reply.size()};
SendReply(Common::HexToString(reply_span, false));
}
Kernel::KThread* GDBStub::GetThreadByID(u64 thread_id) {
const auto& threads{system.ApplicationProcess()->GetThreadList()};
for (auto* thread : threads) {
if (thread->GetThreadId() == thread_id) {
return thread;
}
}
return nullptr;
}
std::vector<char>::const_iterator GDBStub::CommandEnd() const {
// Find the end marker
const auto end{std::find(current_command.begin(), current_command.end(), GDB_STUB_END)};
// Require the checksum to be present
return std::min(end + 2, current_command.end());
}
std::optional<std::string> GDBStub::DetachCommand() {
// Slice the string part from the beginning to the end marker
const auto end{CommandEnd()};
// Extract possible command data
std::string data(current_command.data(), end - current_command.begin() + 1);
// Shift over the remaining contents
current_command.erase(current_command.begin(), end + 1);
// Validate received command
if (data[0] != GDB_STUB_START) {
LOG_ERROR(Debug_GDBStub, "Invalid start data: {}", data[0]);
return std::nullopt;
}
u8 calculated = CalculateChecksum(std::string_view(data).substr(1, data.size() - 4));
u8 received = static_cast<u8>(strtoll(data.data() + data.size() - 2, nullptr, 16));
// Verify checksum
if (calculated != received) {
LOG_ERROR(Debug_GDBStub, "Checksum mismatch: calculated {:02x}, received {:02x}",
calculated, received);
return std::nullopt;
}
return data.substr(1, data.size() - 4);
}
void GDBStub::SendReply(std::string_view data) {
const auto escaped{EscapeGDB(data)};
const auto output{fmt::format("{}{}{}{:02x}", GDB_STUB_START, escaped, GDB_STUB_END,
CalculateChecksum(escaped))};
LOG_TRACE(Debug_GDBStub, "Writing reply: {}", output);
// C++ string support is complete rubbish
const u8* output_begin = reinterpret_cast<const u8*>(output.data());
const u8* output_end = output_begin + output.size();
backend.WriteToClient(std::span<const u8>(output_begin, output_end));
}
void GDBStub::SendStatus(char status) {
if (no_ack) {
return;
}
std::array<u8, 1> buf = {static_cast<u8>(status)};
LOG_TRACE(Debug_GDBStub, "Writing status: {}", status);
backend.WriteToClient(buf);
}
} // namespace Core
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