Atmosphere/stratosphere/libstratosphere/source/on_crash.cpp

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/*
* Copyright (c) 2018-2019 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 <mutex>
#include <switch.h>
#include <stratosphere.hpp>
WEAK sts::ncm::TitleId __stratosphere_title_id = sts::ncm::TitleId::Invalid;
extern "C" {
void WEAK __libstratosphere_exception_handler(AtmosphereFatalErrorContext *ctx);
/* Redefine abort, so that it triggers these handlers. */
void abort();
};
static inline u64 GetPc() {
u64 pc;
__asm__ __volatile__ ("adr %[pc], ." : [pc]"=&r"(pc) :: );
return pc;
}
struct StackFrame {
u64 fp;
u64 lr;
};
void StratosphereCrashHandler(ThreadExceptionDump *ctx) {
AtmosphereFatalErrorContext ams_ctx;
/* Convert thread dump to atmosphere dump. */
{
ams_ctx.magic = AtmosphereFatalErrorMagic;
ams_ctx.error_desc = ctx->error_desc;
ams_ctx.title_id = static_cast<u64>(__stratosphere_title_id);
for (size_t i = 0; i < AtmosphereFatalErrorNumGprs; i++) {
ams_ctx.gprs[i] = ctx->cpu_gprs[i].x;
}
if (ams_ctx.error_desc == DATA_ABORT_ERROR_DESC &&
ams_ctx.gprs[2] == STD_ABORT_ADDR_MAGIC &&
ams_ctx.gprs[3] == STD_ABORT_VALUE_MAGIC) {
/* Detect std::abort(). */
ams_ctx.error_desc = STD_ABORT_ERROR_DESC;
}
ams_ctx.fp = ctx->fp.x;
ams_ctx.lr = ctx->lr.x;
ams_ctx.sp = ctx->sp.x;
ams_ctx.pc = ctx->pc.x;
ams_ctx.pstate = ctx->pstate;
ams_ctx.afsr0 = ctx->afsr0;
ams_ctx.afsr1 = ctx->afsr1;
ams_ctx.far = ctx->far.x;
ams_ctx.report_identifier = armGetSystemTick();
/* Grab module base. */
{
MemoryInfo mem_info;
u32 page_info;
if (R_SUCCEEDED(svcQueryMemory(&mem_info, &page_info, GetPc()))) {
ams_ctx.module_base = mem_info.addr;
} else {
ams_ctx.module_base = 0;
}
}
ams_ctx.stack_trace_size = 0;
u64 cur_fp = ams_ctx.fp;
for (size_t i = 0; i < AMS_FATAL_ERROR_MAX_STACKTRACE; i++) {
/* Validate current frame. */
if (cur_fp == 0 || (cur_fp & 0xF)) {
break;
}
/* Read a new frame. */
StackFrame cur_frame;
MemoryInfo mem_info;
u32 page_info;
if (R_SUCCEEDED(svcQueryMemory(&mem_info, &page_info, cur_fp)) && (mem_info.perm & Perm_R) == Perm_R) {
std::memcpy(&cur_frame, reinterpret_cast<void *>(cur_fp), sizeof(cur_frame));
} else {
break;
}
/* Advance to the next frame. */
ams_ctx.stack_trace[ams_ctx.stack_trace_size++] = cur_frame.lr;
cur_fp = cur_frame.fp;
}
/* Clear unused parts of stack trace. */
for (size_t i = ams_ctx.stack_trace_size; i < AMS_FATAL_ERROR_MAX_STACKTRACE; i++) {
ams_ctx.stack_trace[i] = 0;
}
/* Grab up to 0x100 of stack. */
{
MemoryInfo mem_info;
u32 page_info;
if (R_SUCCEEDED(svcQueryMemory(&mem_info, &page_info, ams_ctx.sp)) && (mem_info.perm & Perm_R) == Perm_R) {
size_t copy_size = std::min(static_cast<size_t>(AMS_FATAL_ERROR_MAX_STACKDUMP), static_cast<size_t>(mem_info.addr + mem_info.size - ams_ctx.sp));
ams_ctx.stack_dump_size = copy_size;
std::memcpy(ams_ctx.stack_dump, reinterpret_cast<void *>(ams_ctx.sp), copy_size);
} else {
ams_ctx.stack_dump_size = 0;
}
}
}
/* Just call the user exception handler. */
__libstratosphere_exception_handler(&ams_ctx);
}
/* Default exception handler behavior. */
void WEAK __libstratosphere_exception_handler(AtmosphereFatalErrorContext *ctx) {
R_ASSERT(bpcAmsInitialize());
R_ASSERT(bpcAmsRebootToFatalError(ctx));
bpcAmsExit();
while (1) { }
}
/* Custom abort handler, so that std::abort will trigger these. */
void abort() {
/* Just perform a data abort. */
register u64 addr __asm__("x2") = STD_ABORT_ADDR_MAGIC;
register u64 val __asm__("x3") = STD_ABORT_VALUE_MAGIC;
while (true) {
__asm__ __volatile__ (
"str %[val], [%[addr]]"
:
: [val]"r"(val), [addr]"r"(addr)
);
}
}