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Atmosphere/stratosphere/creport/source/creport_crash_report.cpp

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/*
* Copyright (c) 2018-2020 Atmosphère-NX
*
* This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU General Public License,
* version 2, as published by the Free Software Foundation.
*
* This program is distributed in the hope it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <sys/stat.h>
#include <sys/types.h>
#include "creport_crash_report.hpp"
#include "creport_utils.hpp"
namespace ams::creport {
namespace {
/* Convenience definitions. */
constexpr size_t DyingMessageAddressOffset = 0x1C0;
static_assert(DyingMessageAddressOffset == OFFSETOF(ams::svc::aarch64::ProcessLocalRegion, dying_message_region_address));
static_assert(DyingMessageAddressOffset == OFFSETOF(ams::svc::aarch32::ProcessLocalRegion, dying_message_region_address));
/* Helper functions. */
bool TryGetCurrentTimestamp(u64 *out) {
/* Clear output. */
*out = 0;
/* Check if we have time service. */
{
bool has_time_service = false;
if (R_FAILED(sm::HasService(&has_time_service, sm::ServiceName::Encode("time:s"))) || !has_time_service) {
return false;
}
}
/* Try to get the current time. */
{
sm::ScopedServiceHolder<timeInitialize, timeExit> time_holder;
return time_holder && R_SUCCEEDED(timeGetCurrentTime(TimeType_LocalSystemClock, out));
}
}
void TryCreateReportDirectories() {
mkdir("sdmc:/atmosphere", S_IRWXU);
mkdir("sdmc:/atmosphere/crash_reports", S_IRWXU);
mkdir("sdmc:/atmosphere/crash_reports/dumps", S_IRWXU);
mkdir("sdmc:/atmosphere/fatal_reports", S_IRWXU);
mkdir("sdmc:/atmosphere/fatal_reports/dumps", S_IRWXU);
}
constexpr const char *GetDebugExceptionString(const svc::DebugException type) {
switch (type) {
case svc::DebugException_UndefinedInstruction:
return "Undefined Instruction";
case svc::DebugException_InstructionAbort:
return "Instruction Abort";
case svc::DebugException_DataAbort:
return "Data Abort";
case svc::DebugException_AlignmentFault:
return "Alignment Fault";
case svc::DebugException_DebuggerAttached:
return "Debugger Attached";
case svc::DebugException_BreakPoint:
return "Break Point";
case svc::DebugException_UserBreak:
return "User Break";
case svc::DebugException_DebuggerBreak:
return "Debugger Break";
case svc::DebugException_UndefinedSystemCall:
return "Undefined System Call";
case svc::DebugException_MemorySystemError:
return "System Memory Error";
default:
return "Unknown";
}
}
}
void CrashReport::BuildReport(os::ProcessId process_id, bool has_extra_info) {
this->has_extra_info = has_extra_info;
if (this->OpenProcess(process_id)) {
ON_SCOPE_EXIT { this->Close(); };
/* Parse info from the crashed process. */
this->ProcessExceptions();
this->module_list.FindModulesFromThreadInfo(this->debug_handle, this->crashed_thread);
this->thread_list.ReadFromProcess(this->debug_handle, this->thread_tls_map, this->Is64Bit());
/* Associate module list to threads. */
this->crashed_thread.SetModuleList(&this->module_list);
this->thread_list.SetModuleList(&this->module_list);
/* Process dying message for applications. */
if (this->IsApplication()) {
this->ProcessDyingMessage();
}
/* Nintendo's creport finds extra modules by looking at all threads if application, */
/* but there's no reason for us not to always go looking. */
for (size_t i = 0; i < this->thread_list.GetThreadCount(); i++) {
this->module_list.FindModulesFromThreadInfo(this->debug_handle, this->thread_list.GetThreadInfo(i));
}
/* Nintendo's creport saves the report to erpt here, but we'll save to SD card later. */
}
}
void CrashReport::GetFatalContext(::FatalCpuContext *_out) const {
static_assert(sizeof(*_out) == sizeof(ams::fatal::CpuContext));
ams::fatal::CpuContext *out = reinterpret_cast<ams::fatal::CpuContext *>(_out);
std::memset(out, 0, sizeof(*out));
/* TODO: Support generating 32-bit fatal contexts? */
out->architecture = fatal::CpuContext::Architecture_Aarch64;
out->type = static_cast<u32>(this->exception_info.type);
for (size_t i = 0; i < fatal::aarch64::RegisterName_FP; i++) {
out->aarch64_ctx.SetRegisterValue(static_cast<fatal::aarch64::RegisterName>(i), this->crashed_thread.GetGeneralPurposeRegister(i));
}
out->aarch64_ctx.SetRegisterValue(fatal::aarch64::RegisterName_FP, this->crashed_thread.GetFP());
out->aarch64_ctx.SetRegisterValue(fatal::aarch64::RegisterName_LR, this->crashed_thread.GetLR());
out->aarch64_ctx.SetRegisterValue(fatal::aarch64::RegisterName_SP, this->crashed_thread.GetSP());
out->aarch64_ctx.SetRegisterValue(fatal::aarch64::RegisterName_PC, this->crashed_thread.GetPC());
out->aarch64_ctx.stack_trace_size = this->crashed_thread.GetStackTraceSize();
for (size_t i = 0; i < out->aarch64_ctx.stack_trace_size; i++) {
out->aarch64_ctx.stack_trace[i] = this->crashed_thread.GetStackTrace(i);
}
if (this->module_list.GetModuleCount()) {
out->aarch64_ctx.SetBaseAddress(this->module_list.GetModuleStartAddress(0));
}
/* For ams fatal, which doesn't use afsr0, pass program_id instead. */
out->aarch64_ctx.SetProgramIdForAtmosphere(ncm::ProgramId{this->process_info.program_id});
}
void CrashReport::ProcessExceptions() {
/* Loop all debug events. */
svc::DebugEventInfo d;
while (R_SUCCEEDED(svcGetDebugEvent(reinterpret_cast<u8 *>(&d), this->debug_handle))) {
switch (d.type) {
case svc::DebugEvent_AttachProcess:
this->HandleDebugEventInfoAttachProcess(d);
break;
case svc::DebugEvent_AttachThread:
this->HandleDebugEventInfoAttachThread(d);
break;
case svc::DebugEvent_Exception:
this->HandleDebugEventInfoException(d);
break;
case svc::DebugEvent_ExitProcess:
case svc::DebugEvent_ExitThread:
break;
}
}
/* Parse crashed thread info. */
this->crashed_thread.ReadFromProcess(this->debug_handle, this->thread_tls_map, this->crashed_thread_id, this->Is64Bit());
}
void CrashReport::HandleDebugEventInfoAttachProcess(const svc::DebugEventInfo &d) {
this->process_info = d.info.attach_process;
/* On 5.0.0+, we want to parse out a dying message from application crashes. */
if (hos::GetVersion() < hos::Version_500 || !IsApplication()) {
return;
}
/* Parse out user data. */
const u64 address = this->process_info.user_exception_context_address + DyingMessageAddressOffset;
u64 userdata_address = 0;
u64 userdata_size = 0;
/* Read userdata address. */
if (R_FAILED(svcReadDebugProcessMemory(&userdata_address, this->debug_handle, address, sizeof(userdata_address)))) {
return;
}
/* Validate userdata address. */
if (userdata_address == 0 || userdata_address & 0xFFF) {
return;
}
/* Read userdata size. */
if (R_FAILED(svcReadDebugProcessMemory(&userdata_size, this->debug_handle, address + sizeof(userdata_address), sizeof(userdata_size)))) {
return;
}
/* Cap userdata size. */
userdata_size = std::min(size_t(userdata_size), sizeof(this->dying_message));
this->dying_message_address = userdata_address;
this->dying_message_size = userdata_size;
}
void CrashReport::HandleDebugEventInfoAttachThread(const svc::DebugEventInfo &d) {
/* Save info on the thread's TLS address for later. */
this->thread_tls_map[d.info.attach_thread.thread_id] = d.info.attach_thread.tls_address;
}
void CrashReport::HandleDebugEventInfoException(const svc::DebugEventInfo &d) {
switch (d.info.exception.type) {
case svc::DebugException_UndefinedInstruction:
this->result = ResultUndefinedInstruction();
break;
case svc::DebugException_InstructionAbort:
this->result = ResultInstructionAbort();
break;
case svc::DebugException_DataAbort:
this->result = ResultDataAbort();
break;
case svc::DebugException_AlignmentFault:
this->result = ResultAlignmentFault();
break;
case svc::DebugException_UserBreak:
this->result = ResultUserBreak();
/* Try to parse out the user break result. */
if (hos::GetVersion() >= hos::Version_500) {
svcReadDebugProcessMemory(&this->result, this->debug_handle, d.info.exception.specific.user_break.address, sizeof(this->result));
}
break;
case svc::DebugException_UndefinedSystemCall:
this->result = ResultUndefinedSystemCall();
break;
case svc::DebugException_MemorySystemError:
this->result = ResultMemorySystemError();
break;
case svc::DebugException_DebuggerAttached:
case svc::DebugException_BreakPoint:
case svc::DebugException_DebuggerBreak:
return;
}
/* Save exception info. */
this->exception_info = d.info.exception;
this->crashed_thread_id = d.thread_id;
}
void CrashReport::ProcessDyingMessage() {
/* Dying message is only stored starting in 5.0.0. */
if (hos::GetVersion() < hos::Version_500) {
return;
}
/* Validate address/size. */
if (this->dying_message_address == 0 || this->dying_message_address & 0xFFF) {
return;
}
if (this->dying_message_size > sizeof(this->dying_message)) {
return;
}
/* Validate that the current report isn't garbage. */
if (!IsOpen() || !IsComplete()) {
return;
}
/* Read the dying message. */
svcReadDebugProcessMemory(this->dying_message, this->debug_handle, this->dying_message_address, this->dying_message_size);
}
void CrashReport::SaveReport() {
/* Try to ensure path exists. */
TryCreateReportDirectories();
/* Get a timestamp. */
u64 timestamp;
if (!TryGetCurrentTimestamp(&timestamp)) {
timestamp = svcGetSystemTick();
}
/* Save files. */
{
char file_path[FS_MAX_PATH];
/* Save crash report. */
std::snprintf(file_path, sizeof(file_path), "sdmc:/atmosphere/crash_reports/%011lu_%016lx.log", timestamp, this->process_info.program_id);
FILE *fp = fopen(file_path, "w");
if (fp != nullptr) {
this->SaveToFile(fp);
fclose(fp);
fp = nullptr;
}
/* Dump threads. */
std::snprintf(file_path, sizeof(file_path), "sdmc:/atmosphere/crash_reports/dumps/%011lu_%016lx_thread_info.bin", timestamp, this->process_info.program_id);
fp = fopen(file_path, "wb");
if (fp != nullptr) {
this->thread_list.DumpBinary(fp, this->crashed_thread.GetThreadId());
fclose(fp);
fp = nullptr;
}
}
}
void CrashReport::SaveToFile(FILE *f_report) {
fprintf(f_report, "Atmosphère Crash Report (v1.4):\n");
fprintf(f_report, "Result: 0x%X (2%03d-%04d)\n\n", this->result.GetValue(), this->result.GetModule(), this->result.GetDescription());
/* Process Info. */
char name_buf[0x10] = {};
static_assert(sizeof(name_buf) >= sizeof(this->process_info.name), "buffer overflow!");
std::memcpy(name_buf, this->process_info.name, sizeof(this->process_info.name));
fprintf(f_report, "Process Info:\n");
fprintf(f_report, " Process Name: %s\n", name_buf);
fprintf(f_report, " Program ID: %016lx\n", this->process_info.program_id);
fprintf(f_report, " Process ID: %016lx\n", this->process_info.process_id);
fprintf(f_report, " Process Flags: %08x\n", this->process_info.flags);
if (hos::GetVersion() >= hos::Version_500) {
fprintf(f_report, " User Exception Address: %s\n", this->module_list.GetFormattedAddressString(this->process_info.user_exception_context_address));
}
/* Exception Info. */
fprintf(f_report, "Exception Info:\n");
fprintf(f_report, " Type: %s\n", GetDebugExceptionString(this->exception_info.type));
fprintf(f_report, " Address: %s\n", this->module_list.GetFormattedAddressString(this->exception_info.address));
switch (this->exception_info.type) {
case svc::DebugException_UndefinedInstruction:
fprintf(f_report, " Opcode: %08x\n", this->exception_info.specific.undefined_instruction.insn);
break;
case svc::DebugException_DataAbort:
case svc::DebugException_AlignmentFault:
if (this->exception_info.specific.raw != this->exception_info.address) {
fprintf(f_report, " Fault Address: %s\n", this->module_list.GetFormattedAddressString(this->exception_info.specific.raw));
}
break;
case svc::DebugException_UndefinedSystemCall:
fprintf(f_report, " Svc Id: 0x%02x\n", this->exception_info.specific.undefined_system_call.id);
break;
case svc::DebugException_UserBreak:
fprintf(f_report, " Break Reason: 0x%x\n", this->exception_info.specific.user_break.break_reason);
fprintf(f_report, " Break Address: %s\n", this->module_list.GetFormattedAddressString(this->exception_info.specific.user_break.address));
fprintf(f_report, " Break Size: 0x%lx\n", this->exception_info.specific.user_break.size);
break;
default:
break;
}
/* Crashed Thread Info. */
fprintf(f_report, "Crashed Thread Info:\n");
this->crashed_thread.SaveToFile(f_report);
/* Dying Message. */
if (hos::GetVersion() >= hos::Version_500 && this->dying_message_size != 0) {
fprintf(f_report, "Dying Message Info:\n");
fprintf(f_report, " Address: 0x%s\n", this->module_list.GetFormattedAddressString(this->dying_message_address));
fprintf(f_report, " Size: 0x%016lx\n", this->dying_message_size);
DumpMemoryHexToFile(f_report, " Dying Message: ", this->dying_message, this->dying_message_size);
}
/* Module Info. */
fprintf(f_report, "Module Info:\n");
this->module_list.SaveToFile(f_report);
/* Thread Info. */
fprintf(f_report, "\nThread Report:\n");
this->thread_list.SaveToFile(f_report);
}
}
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