mirror of
https://github.com/Atmosphere-NX/Atmosphere
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268 lines
10 KiB
C++
268 lines
10 KiB
C++
/*
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* Copyright (c) 2018-2019 Atmosphère-NX
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms and conditions of the GNU General Public License,
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* version 2, as published by the Free Software Foundation.
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*
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* This program is distributed in the hope it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <unordered_map>
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#include "fatal_debug.hpp"
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#include "fatal_config.hpp"
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namespace sts::fatal::srv {
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namespace {
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constexpr u32 SvcSendSyncRequestInstruction = 0xD4000421;
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struct StackFrame {
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u64 fp;
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u64 lr;
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};
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bool IsThreadFatalCaller(u32 error_code, u32 debug_handle, u64 thread_id, u64 thread_tls_addr, ThreadContext *thread_ctx) {
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/* Verify that the thread is running or waiting. */
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{
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u64 _;
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u32 _thread_state;
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if (R_FAILED(svcGetDebugThreadParam(&_, &_thread_state, debug_handle, thread_id, DebugThreadParam_State))) {
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return false;
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}
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const svc::ThreadState thread_state = static_cast<svc::ThreadState>(_thread_state);
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if (thread_state != svc::ThreadState::Waiting && thread_state != svc::ThreadState::Running) {
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return false;
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}
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}
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/* Get the thread context. */
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if (R_FAILED(svcGetDebugThreadContext(thread_ctx, debug_handle, thread_id, svc::ThreadContextFlag_All))) {
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return false;
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}
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/* Try to read the current instruction. */
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u32 insn;
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if (R_FAILED(svcReadDebugProcessMemory(&insn, debug_handle, thread_ctx->pc.x, sizeof(insn)))) {
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return false;
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}
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/* If the instruction isn't svcSendSyncRequest, it's not the fatal caller. */
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if (insn != SvcSendSyncRequestInstruction) {
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return false;
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}
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/* Read in the fatal caller's TLS. */
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u8 thread_tls[0x100];
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if (R_FAILED(svcReadDebugProcessMemory(thread_tls, debug_handle, thread_tls_addr, sizeof(thread_tls)))) {
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return false;
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}
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/* HACK: We want to parse the command the fatal caller sent. */
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/* The easiest way to do this is to copy their TLS over ours, and parse ours. */
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std::memcpy(armGetTls(), thread_tls, sizeof(thread_tls));
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{
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IpcParsedCommand r;
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if (R_FAILED(ipcParse(&r))) {
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return false;
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}
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/* Fatal command takes in a PID, only one buffer max. */
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if (!r.HasPid || r.NumStatics || r.NumStaticsOut || r.NumHandles) {
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return false;
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}
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struct {
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u32 magic;
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u32 version;
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u64 cmd_id;
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u32 err_code;
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} *raw = (decltype(raw))(r.Raw);
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if (raw->magic != SFCI_MAGIC) {
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return false;
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}
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if (raw->cmd_id > 2) {
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return false;
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}
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if (raw->cmd_id != 2 && r.NumBuffers) {
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return false;
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}
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if (raw->err_code != error_code) {
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return false;
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}
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}
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/* We found our caller. */
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return true;
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}
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bool TryGuessBaseAddress(u64 *out_base_address, u32 debug_handle, u64 guess) {
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MemoryInfo mi;
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u32 pi;
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if (R_FAILED(svcQueryDebugProcessMemory(&mi, &pi, debug_handle, guess)) || mi.perm != Perm_Rx) {
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return false;
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}
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/* Iterate backwards until we find the memory before the code region. */
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while (mi.addr > 0) {
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if (R_FAILED(svcQueryDebugProcessMemory(&mi, &pi, debug_handle, guess))) {
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return false;
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}
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if (mi.type == MemType_Unmapped) {
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/* Code region will be at the end of the unmapped region preceding it. */
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*out_base_address = mi.addr + mi.size;
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return true;
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}
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guess = mi.addr - 4;
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}
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return false;
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}
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u64 GetBaseAddress(const ThrowContext *throw_ctx, const ThreadContext *thread_ctx, u32 debug_handle) {
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u64 base_address = 0;
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if (TryGuessBaseAddress(&base_address, debug_handle, thread_ctx->pc.x)) {
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return base_address;
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}
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if (TryGuessBaseAddress(&base_address, debug_handle, thread_ctx->lr)) {
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return base_address;
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}
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for (size_t i = 0; i < throw_ctx->cpu_ctx.aarch64_ctx.stack_trace_size; i++) {
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if (TryGuessBaseAddress(&base_address, debug_handle, throw_ctx->cpu_ctx.aarch64_ctx.stack_trace[i])) {
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return base_address;
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}
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}
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return base_address;
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}
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}
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void TryCollectDebugInformation(ThrowContext *ctx, u64 process_id) {
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/* Try to debug the process. This may fail, if we called into ourself. */
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AutoHandle debug_handle;
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if (R_FAILED(svcDebugActiveProcess(debug_handle.GetPointer(), process_id))) {
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return;
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}
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/* First things first, check if process is 64 bits, and get list of thread infos. */
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std::unordered_map<u64, u64> thread_id_to_tls;
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{
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bool got_attach_process = false;
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svc::DebugEventInfo d;
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while (R_SUCCEEDED(svcGetDebugEvent(reinterpret_cast<u8 *>(&d), debug_handle.Get()))) {
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switch (d.type) {
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case svc::DebugEventType::AttachProcess:
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ctx->cpu_ctx.architecture = (d.info.attach_process.flags & 1) ? CpuContext::Architecture_Aarch64 : CpuContext::Architecture_Aarch32;
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std::memcpy(ctx->proc_name, d.info.attach_process.name, sizeof(d.info.attach_process.name));
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got_attach_process = true;
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break;
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case svc::DebugEventType::AttachThread:
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thread_id_to_tls[d.info.attach_thread.thread_id] = d.info.attach_thread.tls_address;
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break;
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case svc::DebugEventType::Exception:
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case svc::DebugEventType::ExitProcess:
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case svc::DebugEventType::ExitThread:
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break;
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}
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}
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if (!got_attach_process) {
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return;
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}
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}
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/* TODO: Try to collect information on 32-bit fatals. This shouldn't really matter for any real use case. */
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if (ctx->cpu_ctx.architecture == CpuContext::Architecture_Aarch32) {
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return;
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}
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/* Welcome to hell. Here, we try to identify which thread called into fatal. */
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bool found_fatal_caller = false;
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u64 thread_id = 0;
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ThreadContext thread_ctx;
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{
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/* We start by trying to get a list of threads. */
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u32 thread_count;
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u64 thread_ids[0x60];
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if (R_FAILED(svcGetThreadList(&thread_count, thread_ids, 0x60, debug_handle.Get()))) {
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return;
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}
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/* We need to locate the thread that's called fatal. */
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for (u32 i = 0; i < thread_count; i++) {
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const u64 cur_thread_id = thread_ids[i];
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if (thread_id_to_tls.find(cur_thread_id) == thread_id_to_tls.end()) {
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continue;
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}
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if (IsThreadFatalCaller(ctx->error_code, debug_handle.Get(), cur_thread_id, thread_id_to_tls[cur_thread_id], &thread_ctx)) {
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thread_id = cur_thread_id;
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found_fatal_caller = true;
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break;
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}
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}
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if (!found_fatal_caller) {
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return;
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}
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}
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if (R_FAILED(svcGetDebugThreadContext(&thread_ctx, debug_handle.Get(), thread_id, svc::ThreadContextFlag_All))) {
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return;
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}
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/* Set register states. */
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ctx->cpu_ctx.aarch64_ctx.SetRegisterValue(aarch64::RegisterName_FP, thread_ctx.fp);
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ctx->cpu_ctx.aarch64_ctx.SetRegisterValue(aarch64::RegisterName_LR, thread_ctx.lr);
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ctx->cpu_ctx.aarch64_ctx.SetRegisterValue(aarch64::RegisterName_SP, thread_ctx.sp);
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ctx->cpu_ctx.aarch64_ctx.SetRegisterValue(aarch64::RegisterName_PC, thread_ctx.pc.x);
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/* Parse a stack trace. */
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u64 cur_fp = thread_ctx.fp;
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ctx->cpu_ctx.aarch64_ctx.stack_trace_size = 0;
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for (unsigned int i = 0; i < aarch64::CpuContext::MaxStackTraceDepth; i++) {
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/* Validate the current frame. */
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if (cur_fp == 0 || (cur_fp & 0xF)) {
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break;
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}
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/* Read a new frame. */
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StackFrame cur_frame = {};
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if (R_FAILED(svcReadDebugProcessMemory(&cur_frame, debug_handle.Get(), cur_fp, sizeof(StackFrame)))) {
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break;
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}
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/* Advance to the next frame. */
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ctx->cpu_ctx.aarch64_ctx.stack_trace[ctx->cpu_ctx.aarch64_ctx.stack_trace_size++] = cur_frame.lr;
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cur_fp = cur_frame.fp;
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}
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/* Try to read up to 0x100 of stack. */
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for (size_t sz = 0x100; sz > 0; sz -= 0x10) {
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if (R_SUCCEEDED(svcReadDebugProcessMemory(ctx->stack_dump, debug_handle.Get(), thread_ctx.sp, sz))) {
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ctx->stack_dump_size = sz;
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break;
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}
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}
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/* Parse the base address. */
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ctx->cpu_ctx.aarch64_ctx.SetBaseAddress(GetBaseAddress(ctx, &thread_ctx, debug_handle.Get()));
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}
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}
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