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Merge pull request #8410 from liamwhite/thread-names

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gdbstub: Support reading guest thread names
This commit is contained in:
Mai M 2022-06-02 16:34:41 -04:00 committed by GitHub
commit 5c0a31e29f
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GPG key ID: 4AEE18F83AFDEB23
4 changed files with 172 additions and 14 deletions
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171
src/core/debugger/gdbstub.cpp
View file

@ -34,6 +34,65 @@ 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.CurrentProcess()->Is64BitProcess()) {
@ -255,6 +314,80 @@ void GDBStub::ExecuteCommand(std::string_view packet, std::vector<DebuggerAction
}
}
// 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.CurrentProcess()->Is64BitProcess()) {
return GetNameFromThreadType64(system.Memory(), thread);
} else {
return GetNameFromThreadType32(system.Memory(), thread);
}
}
static std::string_view GetThreadWaitReason(const Kernel::KThread* thread) {
switch (thread->GetWaitReasonForDebugging()) {
case Kernel::ThreadWaitReasonForDebugging::Sleep:
@ -332,20 +465,36 @@ void GDBStub::HandleQuery(std::string_view command) {
} else if (command.starts_with("sThreadInfo")) {
// end of list
SendReply("l");
} else if (command.starts_with("Xfer:threads:read")) {
} else if (command.starts_with("Xfer:threads:read::")) {
std::string buffer;
buffer += R"(l<?xml version="1.0"?>)";
buffer += R"(<?xml version="1.0"?>)";
buffer += "<threads>";
const auto& threads = system.GlobalSchedulerContext().GetThreadList();
for (const auto& thread : threads) {
buffer += fmt::format(R"(<thread id="{:x}" core="{:d}" name="Thread {:d}">{}</thread>)",
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(),
thread->GetThreadID(), GetThreadState(thread));
EscapeXML(*thread_name), GetThreadState(thread));
}
buffer += "</threads>";
SendReply(buffer);
const auto offset{command.substr(19)};
const auto amount{command.substr(command.find(',') + 1)};
const auto offset_val{static_cast<u64>(strtoll(offset.data(), nullptr, 16))};
const auto amount_val{static_cast<u64>(strtoll(amount.data(), nullptr, 16))};
if (offset_val + amount_val > buffer.size()) {
SendReply("l" + buffer.substr(offset_val));
} else {
SendReply("m" + buffer.substr(offset_val, amount_val));
}
} else if (command.starts_with("Attached")) {
SendReply("0");
} else if (command.starts_with("StartNoAckMode")) {
@ -438,14 +587,10 @@ std::optional<std::string> GDBStub::DetachCommand() {
return data.substr(1, data.size() - 4);
}
u8 GDBStub::CalculateChecksum(std::string_view data) {
return std::accumulate(data.begin(), data.end(), u8{0},
[](u8 lhs, u8 rhs) { return static_cast<u8>(lhs + rhs); });
}
void GDBStub::SendReply(std::string_view data) {
const auto output{
fmt::format("{}{}{}{:02x}", GDB_STUB_START, data, GDB_STUB_END, CalculateChecksum(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

1
src/core/debugger/gdbstub.h
View file

@ -34,7 +34,6 @@ private:
std::optional<std::string> DetachCommand();
Kernel::KThread* GetThreadByID(u64 thread_id);
static u8 CalculateChecksum(std::string_view data);
void SendReply(std::string_view data);
void SendStatus(char status);

4
src/core/hle/kernel/k_thread.cpp
View file

@ -198,6 +198,10 @@ ResultCode KThread::Initialize(KThreadFunction func, uintptr_t arg, VAddr user_s
resource_limit_release_hint = false;
cpu_time = 0;
// Set debug context.
stack_top = user_stack_top;
argument = arg;
// Clear our stack parameters.
std::memset(static_cast<void*>(std::addressof(GetStackParameters())), 0,
sizeof(StackParameters));

10
src/core/hle/kernel/k_thread.h
View file

@ -660,6 +660,14 @@ public:
void IfDummyThreadTryWait();
void IfDummyThreadEndWait();
[[nodiscard]] uintptr_t GetArgument() const {
return argument;
}
[[nodiscard]] VAddr GetUserStackTop() const {
return stack_top;
}
private:
static constexpr size_t PriorityInheritanceCountMax = 10;
union SyncObjectBuffer {
@ -791,6 +799,8 @@ private:
std::vector<KSynchronizationObject*> wait_objects_for_debugging;
VAddr mutex_wait_address_for_debugging{};
ThreadWaitReasonForDebugging wait_reason_for_debugging{};
uintptr_t argument;
VAddr stack_top;
public:
using ConditionVariableThreadTreeType = ConditionVariableThreadTree;