Mirrors/yuzu
1
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity Actions

kernel: fix debugger and process list lifetime

Browse source
This commit is contained in:
Liam 2024-01-02 17:12:16 -05:00
parent f2fed21c11
commit f90a022d3a
9 changed files with 160 additions and 107 deletions
Download patch file Download diff file Expand all files Collapse all files

39
src/core/debugger/debugger.cpp
View file

@ -114,7 +114,7 @@ public:
}
Kernel::KThread* GetActiveThread() override {
return state->active_thread;
return state->active_thread.GetPointerUnsafe();
}
private:
@ -147,11 +147,14 @@ private:
std::scoped_lock lk{connection_lock};
// Find the process we are going to debug.
SetDebugProcess();
// Ensure everything is stopped.
PauseEmulation();
// Set up the new frontend.
frontend = std::make_unique<GDBStub>(*this, system);
frontend = std::make_unique<GDBStub>(*this, system, debug_process.GetPointerUnsafe());
// Set the new state. This will tear down any existing state.
state = ConnectionState{
@ -194,15 +197,20 @@ private:
UpdateActiveThread();
if (state->info.type == SignalType::Watchpoint) {
frontend->Watchpoint(state->active_thread, *state->info.watchpoint);
frontend->Watchpoint(std::addressof(*state->active_thread),
*state->info.watchpoint);
} else {
frontend->Stopped(state->active_thread);
frontend->Stopped(std::addressof(*state->active_thread));
}
break;
case SignalType::ShuttingDown:
frontend->ShuttingDown();
// Release members.
state->active_thread.Reset(nullptr);
debug_process.Reset(nullptr);
// Wait for emulation to shut down gracefully now.
state->signal_pipe.close();
state->client_socket.shutdown(boost::asio::socket_base::shutdown_both);
@ -222,7 +230,7 @@ private:
stopped = true;
PauseEmulation();
UpdateActiveThread();
frontend->Stopped(state->active_thread);
frontend->Stopped(state->active_thread.GetPointerUnsafe());
break;
}
case DebuggerAction::Continue:
@ -232,7 +240,7 @@ private:
MarkResumed([&] {
state->active_thread->SetStepState(Kernel::StepState::StepPending);
state->active_thread->Resume(Kernel::SuspendType::Debug);
ResumeEmulation(state->active_thread);
ResumeEmulation(state->active_thread.GetPointerUnsafe());
});
break;
case DebuggerAction::StepThreadLocked: {
@ -255,6 +263,7 @@ private:
}
void PauseEmulation() {
Kernel::KScopedLightLock ll{debug_process->GetListLock()};
Kernel::KScopedSchedulerLock sl{system.Kernel()};
// Put all threads to sleep on next scheduler round.
@ -264,6 +273,9 @@ private:
}
void ResumeEmulation(Kernel::KThread* except = nullptr) {
Kernel::KScopedLightLock ll{debug_process->GetListLock()};
Kernel::KScopedSchedulerLock sl{system.Kernel()};
// Wake up all threads.
for (auto& thread : ThreadList()) {
if (std::addressof(thread) == except) {
@ -277,15 +289,16 @@ private:
template <typename Callback>
void MarkResumed(Callback&& cb) {
Kernel::KScopedSchedulerLock sl{system.Kernel()};
stopped = false;
cb();
}
void UpdateActiveThread() {
Kernel::KScopedLightLock ll{debug_process->GetListLock()};
auto& threads{ThreadList()};
for (auto& thread : threads) {
if (std::addressof(thread) == state->active_thread) {
if (std::addressof(thread) == state->active_thread.GetPointerUnsafe()) {
// Thread is still alive, no need to update.
return;
}
@ -293,12 +306,18 @@ private:
state->active_thread = std::addressof(threads.front());
}
private:
void SetDebugProcess() {
debug_process = std::move(system.Kernel().GetProcessList().back());
}
Kernel::KProcess::ThreadList& ThreadList() {
return system.ApplicationProcess()->GetThreadList();
return debug_process->GetThreadList();
}
private:
System& system;
Kernel::KScopedAutoObject<Kernel::KProcess> debug_process;
std::unique_ptr<DebuggerFrontend> frontend;
boost::asio::io_context io_context;
@ -310,7 +329,7 @@ private:
boost::process::async_pipe signal_pipe;
SignalInfo info;
Kernel::KThread* active_thread;
Kernel::KScopedAutoObject<Kernel::KThread> active_thread;
std::array<u8, 4096> client_data;
bool pipe_data;
};

66
src/core/debugger/gdbstub.cpp
View file

@ -108,9 +108,9 @@ static std::string EscapeXML(std::string_view data) {
return escaped;
}
GDBStub::GDBStub(DebuggerBackend& backend_, Core::System& system_)
: DebuggerFrontend(backend_), system{system_} {
if (system.ApplicationProcess()->Is64Bit()) {
GDBStub::GDBStub(DebuggerBackend& backend_, Core::System& system_, Kernel::KProcess* debug_process_)
: DebuggerFrontend(backend_), system{system_}, debug_process{debug_process_} {
if (GetProcess()->Is64Bit()) {
arch = std::make_unique<GDBStubA64>();
} else {
arch = std::make_unique<GDBStubA32>();
@ -276,7 +276,7 @@ void GDBStub::ExecuteCommand(std::string_view packet, std::vector<DebuggerAction
const size_t size{static_cast<size_t>(strtoll(command.data() + sep, nullptr, 16))};
std::vector<u8> mem(size);
if (system.ApplicationMemory().ReadBlock(addr, mem.data(), size)) {
if (GetMemory().ReadBlock(addr, mem.data(), size)) {
// Restore any bytes belonging to replaced instructions.
auto it = replaced_instructions.lower_bound(addr);
for (; it != replaced_instructions.end() && it->first < addr + size; it++) {
@ -310,8 +310,8 @@ void GDBStub::ExecuteCommand(std::string_view packet, std::vector<DebuggerAction
const auto mem_substr{std::string_view(command).substr(mem_sep)};
const auto mem{Common::HexStringToVector(mem_substr, false)};
if (system.ApplicationMemory().WriteBlock(addr, mem.data(), size)) {
Core::InvalidateInstructionCacheRange(system.ApplicationProcess(), addr, size);
if (GetMemory().WriteBlock(addr, mem.data(), size)) {
Core::InvalidateInstructionCacheRange(GetProcess(), addr, size);
SendReply(GDB_STUB_REPLY_OK);
} else {
SendReply(GDB_STUB_REPLY_ERR);
@ -353,7 +353,7 @@ void GDBStub::HandleBreakpointInsert(std::string_view command) {
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)) {
if (!GetMemory().IsValidVirtualAddressRange(addr, size)) {
SendReply(GDB_STUB_REPLY_ERR);
return;
}
@ -362,22 +362,20 @@ void GDBStub::HandleBreakpointInsert(std::string_view command) {
switch (type) {
case BreakpointType::Software:
replaced_instructions[addr] = system.ApplicationMemory().Read32(addr);
system.ApplicationMemory().Write32(addr, arch->BreakpointInstruction());
Core::InvalidateInstructionCacheRange(system.ApplicationProcess(), addr, sizeof(u32));
replaced_instructions[addr] = GetMemory().Read32(addr);
GetMemory().Write32(addr, arch->BreakpointInstruction());
Core::InvalidateInstructionCacheRange(GetProcess(), addr, sizeof(u32));
success = true;
break;
case BreakpointType::WriteWatch:
success = system.ApplicationProcess()->InsertWatchpoint(addr, size,
Kernel::DebugWatchpointType::Write);
success = GetProcess()->InsertWatchpoint(addr, size, Kernel::DebugWatchpointType::Write);
break;
case BreakpointType::ReadWatch:
success = system.ApplicationProcess()->InsertWatchpoint(addr, size,
Kernel::DebugWatchpointType::Read);
success = GetProcess()->InsertWatchpoint(addr, size, Kernel::DebugWatchpointType::Read);
break;
case BreakpointType::AccessWatch:
success = system.ApplicationProcess()->InsertWatchpoint(
addr, size, Kernel::DebugWatchpointType::ReadOrWrite);
success =
GetProcess()->InsertWatchpoint(addr, size, Kernel::DebugWatchpointType::ReadOrWrite);
break;
case BreakpointType::Hardware:
default:
@ -400,7 +398,7 @@ void GDBStub::HandleBreakpointRemove(std::string_view command) {
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)) {
if (!GetMemory().IsValidVirtualAddressRange(addr, size)) {
SendReply(GDB_STUB_REPLY_ERR);
return;
}
@ -411,24 +409,22 @@ void GDBStub::HandleBreakpointRemove(std::string_view command) {
case BreakpointType::Software: {
const auto orig_insn{replaced_instructions.find(addr)};
if (orig_insn != replaced_instructions.end()) {
system.ApplicationMemory().Write32(addr, orig_insn->second);
Core::InvalidateInstructionCacheRange(system.ApplicationProcess(), addr, sizeof(u32));
GetMemory().Write32(addr, orig_insn->second);
Core::InvalidateInstructionCacheRange(GetProcess(), addr, sizeof(u32));
replaced_instructions.erase(addr);
success = true;
}
break;
}
case BreakpointType::WriteWatch:
success = system.ApplicationProcess()->RemoveWatchpoint(addr, size,
Kernel::DebugWatchpointType::Write);
success = GetProcess()->RemoveWatchpoint(addr, size, Kernel::DebugWatchpointType::Write);
break;
case BreakpointType::ReadWatch:
success = system.ApplicationProcess()->RemoveWatchpoint(addr, size,
Kernel::DebugWatchpointType::Read);
success = GetProcess()->RemoveWatchpoint(addr, size, Kernel::DebugWatchpointType::Read);
break;
case BreakpointType::AccessWatch:
success = system.ApplicationProcess()->RemoveWatchpoint(
addr, size, Kernel::DebugWatchpointType::ReadOrWrite);
success =
GetProcess()->RemoveWatchpoint(addr, size, Kernel::DebugWatchpointType::ReadOrWrite);
break;
case BreakpointType::Hardware:
default:
@ -466,10 +462,10 @@ void GDBStub::HandleQuery(std::string_view command) {
const auto target_xml{arch->GetTargetXML()};
SendReply(PaginateBuffer(target_xml, command.substr(30)));
} else if (command.starts_with("Offsets")) {
const auto main_offset = Core::FindMainModuleEntrypoint(system.ApplicationProcess());
const auto main_offset = Core::FindMainModuleEntrypoint(GetProcess());
SendReply(fmt::format("TextSeg={:x}", GetInteger(main_offset)));
} else if (command.starts_with("Xfer:libraries:read::")) {
auto modules = Core::FindModules(system.ApplicationProcess());
auto modules = Core::FindModules(GetProcess());
std::string buffer;
buffer += R"(<?xml version="1.0"?>)";
@ -483,7 +479,7 @@ void GDBStub::HandleQuery(std::string_view command) {
SendReply(PaginateBuffer(buffer, command.substr(21)));
} else if (command.starts_with("fThreadInfo")) {
// beginning of list
const auto& threads = system.ApplicationProcess()->GetThreadList();
const auto& threads = GetProcess()->GetThreadList();
std::vector<std::string> thread_ids;
for (const auto& thread : threads) {
thread_ids.push_back(fmt::format("{:x}", thread.GetThreadId()));
@ -497,7 +493,7 @@ void GDBStub::HandleQuery(std::string_view command) {
buffer += R"(<?xml version="1.0"?>)";
buffer += "<threads>";
const auto& threads = system.ApplicationProcess()->GetThreadList();
const auto& threads = GetProcess()->GetThreadList();
for (const auto& thread : threads) {
auto thread_name{Core::GetThreadName(&thread)};
if (!thread_name) {
@ -613,7 +609,7 @@ 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* process = GetProcess();
auto& page_table = process->GetPageTable();
const char* commands = "Commands:\n"
@ -714,7 +710,7 @@ void GDBStub::HandleRcmd(const std::vector<u8>& command) {
}
Kernel::KThread* GDBStub::GetThreadByID(u64 thread_id) {
auto& threads{system.ApplicationProcess()->GetThreadList()};
auto& threads{GetProcess()->GetThreadList()};
for (auto& thread : threads) {
if (thread.GetThreadId() == thread_id) {
return std::addressof(thread);
@ -783,4 +779,12 @@ void GDBStub::SendStatus(char status) {
backend.WriteToClient(buf);
}
Kernel::KProcess* GDBStub::GetProcess() {
return debug_process;
}
Core::Memory::Memory& GDBStub::GetMemory() {
return GetProcess()->GetMemory();
}
} // namespace Core

15
src/core/debugger/gdbstub.h
View file

@ -12,13 +12,22 @@
#include "core/debugger/debugger_interface.h"
#include "core/debugger/gdbstub_arch.h"
namespace Kernel {
class KProcess;
}
namespace Core::Memory {
class Memory;
}
namespace Core {
class System;
class GDBStub : public DebuggerFrontend {
public:
explicit GDBStub(DebuggerBackend& backend, Core::System& system);
explicit GDBStub(DebuggerBackend& backend, Core::System& system,
Kernel::KProcess* debug_process);
~GDBStub() override;
void Connected() override;
@ -42,8 +51,12 @@ private:
void SendReply(std::string_view data);
void SendStatus(char status);
Kernel::KProcess* GetProcess();
Core::Memory::Memory& GetMemory();
private:
Core::System& system;
Kernel::KProcess* debug_process;
std::unique_ptr<GDBStubArch> arch;
std::vector<char> current_command;
std::map<VAddr, u32> replaced_instructions;