mirror of
https://github.com/Atmosphere-NX/Atmosphere.git
synced 2025-05-31 23:08:22 -04:00
kern: implement thread call stack debug
This commit is contained in:
Michael Scire
parent
16e2f46aed
commit
af259eabda
11 changed files with 657 additions and 32 deletions
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@ -384,4 +384,541 @@ namespace ams::kern::arch::arm64 {
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#undef MESOSPHERE_SET_HW_WATCH_POINT
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#undef MESOSPHERE_SET_HW_BREAK_POINT
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void KDebug::PrintRegister(KThread *thread) {
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#if defined(MESOSPHERE_BUILD_FOR_DEBUGGING)
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{
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/* Treat no thread as current thread. */
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if (thread == nullptr) {
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thread = GetCurrentThreadPointer();
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}
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/* Get the exception context. */
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KExceptionContext *e_ctx = GetExceptionContext(thread);
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/* Get the owner process. */
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if (auto *process = thread->GetOwnerProcess(); process != nullptr) {
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/* Lock the owner process. */
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KScopedLightLock state_lk(process->GetStateLock());
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KScopedLightLock list_lk(process->GetListLock());
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/* Suspend all the process's threads. */
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{
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KScopedSchedulerLock sl;
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auto end = process->GetThreadList().end();
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for (auto it = process->GetThreadList().begin(); it != end; ++it) {
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if (std::addressof(*it) != GetCurrentThreadPointer()) {
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it->RequestSuspend(KThread::SuspendType_Backtrace);
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}
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}
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}
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/* Print the registers. */
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MESOSPHERE_RELEASE_LOG("Registers\n");
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if ((e_ctx->psr & 0x10) == 0) {
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/* 64-bit thread. */
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for (auto i = 0; i < 31; ++i) {
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MESOSPHERE_RELEASE_LOG(" X[%2d]: 0x%016lx\n", i, e_ctx->x[i]);
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}
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MESOSPHERE_RELEASE_LOG(" SP: 0x%016lx\n", e_ctx->sp);
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MESOSPHERE_RELEASE_LOG(" PC: 0x%016lx\n", e_ctx->pc - sizeof(u32));
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MESOSPHERE_RELEASE_LOG(" PSR: 0x%08x\n", e_ctx->psr);
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MESOSPHERE_RELEASE_LOG(" TPIDR_EL0: 0x%016lx\n", e_ctx->tpidr);
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} else {
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/* 32-bit thread. */
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for (auto i = 0; i < 13; ++i) {
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MESOSPHERE_RELEASE_LOG(" R[%2d]: 0x%08x\n", i, static_cast<u32>(e_ctx->x[i]));
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}
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MESOSPHERE_RELEASE_LOG(" SP: 0x%08x\n", static_cast<u32>(e_ctx->x[13]));
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MESOSPHERE_RELEASE_LOG(" LR: 0x%08x\n", static_cast<u32>(e_ctx->x[14]));
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MESOSPHERE_RELEASE_LOG(" PC: 0x%08x\n", static_cast<u32>(e_ctx->pc) - static_cast<u32>((e_ctx->psr & 0x20) ? sizeof(u16) : sizeof(u32)));
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MESOSPHERE_RELEASE_LOG(" PSR: 0x%08x\n", e_ctx->psr);
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MESOSPHERE_RELEASE_LOG(" TPIDR: 0x%08x\n", static_cast<u32>(e_ctx->tpidr));
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}
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/* Resume the threads that we suspended. */
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{
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KScopedSchedulerLock sl;
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auto end = process->GetThreadList().end();
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for (auto it = process->GetThreadList().begin(); it != end; ++it) {
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if (std::addressof(*it) != GetCurrentThreadPointer()) {
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it->Resume(KThread::SuspendType_Backtrace);
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}
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}
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}
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}
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}
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#else
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MESOSPHERE_UNUSED(thread);
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#endif
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}
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#if defined(MESOSPHERE_BUILD_FOR_DEBUGGING)
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namespace {
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bool IsHeapPhysicalAddress(KPhysicalAddress phys_addr) {
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const KMemoryRegion *cached = nullptr;
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return KMemoryLayout::IsHeapPhysicalAddress(cached, phys_addr);
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}
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template<typename T>
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bool ReadValue(T *out, KProcess *process, uintptr_t address) {
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KPhysicalAddress phys_addr;
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KMemoryInfo mem_info;
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ams::svc::PageInfo page_info;
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if (!util::IsAligned(address, sizeof(T))) {
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return false;
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}
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if (R_FAILED(process->GetPageTable().QueryInfo(std::addressof(mem_info), std::addressof(page_info), address))) {
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return false;
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}
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if ((mem_info.GetPermission() & KMemoryPermission_UserRead) != KMemoryPermission_UserRead) {
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return false;
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}
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if (!process->GetPageTable().GetPhysicalAddress(std::addressof(phys_addr), address)) {
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return false;
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}
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if (!IsHeapPhysicalAddress(phys_addr)) {
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return false;
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}
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*out = *GetPointer<T>(process->GetPageTable().GetHeapVirtualAddress(phys_addr));
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return true;
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}
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bool GetModuleName(char *dst, size_t dst_size, KProcess *process, uintptr_t base_address) {
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/* Locate .rodata. */
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KMemoryInfo mem_info;
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ams::svc::PageInfo page_info;
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KMemoryState mem_state = KMemoryState_None;
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while (true) {
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if (R_FAILED(process->GetPageTable().QueryInfo(std::addressof(mem_info), std::addressof(page_info), base_address))) {
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return false;
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}
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if (mem_state == KMemoryState_None) {
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mem_state = mem_info.GetState();
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if (mem_state != KMemoryState_Code && mem_state != KMemoryState_AliasCode) {
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return false;
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}
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}
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if (mem_info.GetState() != mem_state) {
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return false;
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}
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if (mem_info.GetPermission() == KMemoryPermission_UserRead) {
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break;
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}
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base_address = mem_info.GetEndAddress();
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}
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/* Check that first value is 0. */
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u32 val;
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if (!ReadValue(std::addressof(val), process, base_address)) {
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return false;
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}
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if (val != 0) {
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return false;
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}
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/* Read the name length. */
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if (!ReadValue(std::addressof(val), process, base_address + sizeof(u32))) {
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return false;
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}
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if (!(0 < val && val < dst_size)) {
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return false;
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}
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const size_t name_len = val;
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/* Read the name, one character at a time. */
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for (size_t i = 0; i < name_len; ++i) {
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if (!ReadValue(dst + i, process, base_address + 2 * sizeof(u32) + i)) {
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return false;
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}
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if (!(0 < dst[i] && dst[i] <= 0x7F)) {
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return false;
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}
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}
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/* NULL-terminate. */
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dst[name_len] = 0;
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return true;
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}
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void PrintAddress(uintptr_t address) {
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MESOSPHERE_RELEASE_LOG(" %p\n", reinterpret_cast<void *>(address));
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}
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void PrintAddressWithModuleName(uintptr_t address, bool has_module_name, const char *module_name, uintptr_t base_address) {
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if (has_module_name) {
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MESOSPHERE_RELEASE_LOG(" %p [%10s + %8lx]\n", reinterpret_cast<void *>(address), module_name, address - base_address);
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} else {
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MESOSPHERE_RELEASE_LOG(" %p [%10lx + %8lx]\n", reinterpret_cast<void *>(address), base_address, address - base_address);
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}
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}
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void PrintAddressWithSymbol(uintptr_t address, bool has_module_name, const char *module_name, uintptr_t base_address, const char *symbol_name, uintptr_t func_address) {
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if (has_module_name) {
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MESOSPHERE_RELEASE_LOG(" %p [%10s + %8lx] (%s + %lx)\n", reinterpret_cast<void *>(address), module_name, address - base_address, symbol_name, address - func_address);
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} else {
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MESOSPHERE_RELEASE_LOG(" %p [%10lx + %8lx] (%s + %lx)\n", reinterpret_cast<void *>(address), base_address, address - base_address, symbol_name, address - func_address);
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}
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}
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void PrintCodeAddress(KProcess *process, uintptr_t address, bool is_lr = true) {
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/* Prepare to parse + print the address. */
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uintptr_t test_address = is_lr ? address - sizeof(u32) : address;
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uintptr_t base_address = address;
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uintptr_t dyn_address = 0;
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uintptr_t sym_tab = 0;
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uintptr_t str_tab = 0;
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size_t num_sym = 0;
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u64 temp_64;
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u32 temp_32;
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/* Locate the start of .text. */
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KMemoryInfo mem_info;
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ams::svc::PageInfo page_info;
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KMemoryState mem_state = KMemoryState_None;
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while (true) {
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if (R_FAILED(process->GetPageTable().QueryInfo(std::addressof(mem_info), std::addressof(page_info), base_address))) {
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return PrintAddress(address);
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}
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if (mem_state == KMemoryState_None) {
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mem_state = mem_info.GetState();
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if (mem_state != KMemoryState_Code && mem_state != KMemoryState_AliasCode) {
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return PrintAddress(address);
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}
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} else if (mem_info.GetState() != mem_state) {
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return PrintAddress(address);
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}
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if (mem_info.GetPermission() != KMemoryPermission_UserReadExecute) {
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return PrintAddress(address);
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}
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base_address = mem_info.GetAddress();
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if (R_FAILED(process->GetPageTable().QueryInfo(std::addressof(mem_info), std::addressof(page_info), base_address - 1))) {
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return PrintAddress(address);
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}
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if (mem_info.GetState() != mem_state) {
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break;
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}
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if (mem_info.GetPermission() != KMemoryPermission_UserReadExecute) {
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break;
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}
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}
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/* Read the first instruction. */
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if (!ReadValue(std::addressof(temp_32), process, base_address)) {
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return PrintAddress(address);
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}
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/* Get the module name. */
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char module_name[0x20];
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const bool has_module_name = GetModuleName(module_name, sizeof(module_name), process, base_address);
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/* If the process is 32-bit, just print the module. */
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if (!process->Is64Bit()) {
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return PrintAddressWithModuleName(address, has_module_name, module_name, base_address);
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}
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if (temp_32 == 0) {
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/* Module is dynamically loaded by rtld. */
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u32 mod_offset;
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if (!ReadValue(std::addressof(mod_offset), process, base_address + sizeof(u32))) {
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return PrintAddressWithModuleName(address, has_module_name, module_name, base_address);
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}
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if (!ReadValue(std::addressof(temp_32), process, base_address + mod_offset)) {
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return PrintAddressWithModuleName(address, has_module_name, module_name, base_address);
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}
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if (temp_32 != 0x30444F4D) { /* MOD0 */
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return PrintAddressWithModuleName(address, has_module_name, module_name, base_address);
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}
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if (!ReadValue(std::addressof(temp_32), process, base_address + mod_offset + sizeof(u32))) {
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return PrintAddressWithModuleName(address, has_module_name, module_name, base_address);
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}
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dyn_address = base_address + mod_offset + temp_32;
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} else if (temp_32 == 0x14000002) {
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/* Module embeds rtld. */
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if (!ReadValue(std::addressof(temp_32), process, base_address + 0x5C)) {
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return PrintAddressWithModuleName(address, has_module_name, module_name, base_address);
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}
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if (temp_32 != 0x94000002) { /* MOD0 */
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return PrintAddressWithModuleName(address, has_module_name, module_name, base_address);
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}
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if (!ReadValue(std::addressof(temp_32), process, base_address + 0x60)) {
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return PrintAddressWithModuleName(address, has_module_name, module_name, base_address);
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}
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dyn_address = base_address + 0x60 + temp_32;
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} else {
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return PrintAddressWithModuleName(address, has_module_name, module_name, base_address);
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}
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/* Locate tables inside .dyn. */
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for (size_t ofs = 0; /* ... */; ofs += 0x10) {
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/* Read the DynamicTag. */
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if (!ReadValue(std::addressof(temp_64), process, dyn_address + ofs)) {
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return PrintAddressWithModuleName(address, has_module_name, module_name, base_address);
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}
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if (temp_64 == 0) {
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/* We're done parsing .dyn. */
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break;
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} else if (temp_64 == 4) {
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/* We found DT_HASH */
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if (!ReadValue(std::addressof(temp_64), process, dyn_address + ofs + sizeof(u64))) {
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return PrintAddressWithModuleName(address, has_module_name, module_name, base_address);
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}
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/* Read nchain, to get the number of symbols. */
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if (!ReadValue(std::addressof(temp_32), process, base_address + temp_64 + sizeof(u32))) {
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return PrintAddressWithModuleName(address, has_module_name, module_name, base_address);
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}
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num_sym = temp_32;
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} else if (temp_64 == 5) {
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/* We found DT_STRTAB */
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if (!ReadValue(std::addressof(temp_64), process, dyn_address + ofs + sizeof(u64))) {
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return PrintAddressWithModuleName(address, has_module_name, module_name, base_address);
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}
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str_tab = base_address + temp_64;
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} else if (temp_64 == 6) {
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/* We found DT_SYMTAB */
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if (!ReadValue(std::addressof(temp_64), process, dyn_address + ofs + sizeof(u64))) {
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return PrintAddressWithModuleName(address, has_module_name, module_name, base_address);
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}
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sym_tab = base_address + temp_64;
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}
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}
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/* Check that we found all the tables. */
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if (!(sym_tab != 0 && str_tab != 0 && num_sym != 0)) {
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return PrintAddressWithModuleName(address, has_module_name, module_name, base_address);
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}
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/* Try to locate an appropriate symbol. */
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for (size_t i = 0; i < num_sym; ++i) {
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/* Read the symbol from userspace. */
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struct {
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u32 st_name;
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u8 st_info;
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u8 st_other;
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u16 st_shndx;
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u64 st_value;
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u64 st_size;
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} sym;
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{
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u64 x[sizeof(sym) / sizeof(u64)];
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for (size_t j = 0; j < util::size(x); ++j) {
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if (!ReadValue(x + j, process, sym_tab + sizeof(sym) * i + sizeof(u64) * j)) {
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return PrintAddressWithModuleName(address, has_module_name, module_name, base_address);
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}
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}
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std::memcpy(std::addressof(sym), x, sizeof(sym));
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}
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/* Check the symbol is valid/STT_FUNC. */
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if (sym.st_shndx == 0 || ((sym.st_shndx & 0xFF00) == 0xFF00)) {
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continue;
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}
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if ((sym.st_info & 0xF) != 2) {
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continue;
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}
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/* Check the address. */
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const uintptr_t func_start = base_address + sym.st_value;
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if (func_start <= test_address && test_address < func_start + sym.st_size) {
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/* Read the symbol name. */
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const uintptr_t sym_address = str_tab + sym.st_name;
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char sym_name[0x80];
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sym_name[util::size(sym_name) - 1] = 0;
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for (size_t j = 0; j < util::size(sym_name) - 1; ++j) {
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if (!ReadValue(sym_name + j, process, sym_address + j)) {
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return PrintAddressWithModuleName(address, has_module_name, module_name, base_address);
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}
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if (sym_name[j] == 0) {
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break;
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}
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}
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/* Print the symbol. */
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return PrintAddressWithSymbol(address, has_module_name, module_name, base_address, sym_name, func_start);
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}
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}
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/* Fall back to printing the module. */
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return PrintAddressWithModuleName(address, has_module_name, module_name, base_address);
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}
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}
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#endif
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void KDebug::PrintBacktrace(KThread *thread) {
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#if defined(MESOSPHERE_BUILD_FOR_DEBUGGING)
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{
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/* Treat no thread as current thread. */
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if (thread == nullptr) {
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thread = GetCurrentThreadPointer();
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}
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/* Get the exception context. */
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KExceptionContext *e_ctx = GetExceptionContext(thread);
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/* Get the owner process. */
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if (auto *process = thread->GetOwnerProcess(); process != nullptr) {
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/* Lock the owner process. */
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KScopedLightLock state_lk(process->GetStateLock());
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KScopedLightLock list_lk(process->GetListLock());
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/* Suspend all the process's threads. */
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{
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KScopedSchedulerLock sl;
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auto end = process->GetThreadList().end();
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for (auto it = process->GetThreadList().begin(); it != end; ++it) {
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if (std::addressof(*it) != GetCurrentThreadPointer()) {
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it->RequestSuspend(KThread::SuspendType_Backtrace);
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}
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}
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}
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/* Print the backtrace. */
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MESOSPHERE_RELEASE_LOG("User Backtrace\n");
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if ((e_ctx->psr & 0x10) == 0) {
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/* 64-bit thread. */
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PrintCodeAddress(process, e_ctx->pc, false);
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PrintCodeAddress(process, e_ctx->x[30]);
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/* Walk the stack frames. */
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uintptr_t fp = static_cast<uintptr_t>(e_ctx->x[29]);
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for (auto i = 0; i < 0x20 && fp != 0 && util::IsAligned(fp, 0x10); ++i) {
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/* Read the next frame. */
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struct {
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u64 fp;
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u64 lr;
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} stack_frame;
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{
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KMemoryInfo mem_info;
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ams::svc::PageInfo page_info;
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KPhysicalAddress phys_addr;
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if (R_FAILED(process->GetPageTable().QueryInfo(std::addressof(mem_info), std::addressof(page_info), fp))) {
|
||||
break;
|
||||
}
|
||||
if ((mem_info.GetState() & KMemoryState_FlagReferenceCounted) == 0) {
|
||||
break;
|
||||
}
|
||||
if ((mem_info.GetAttribute() & KMemoryAttribute_Uncached) != 0) {
|
||||
break;
|
||||
}
|
||||
if ((mem_info.GetPermission() & KMemoryPermission_UserRead) != KMemoryPermission_UserRead) {
|
||||
break;
|
||||
}
|
||||
if (!process->GetPageTable().GetPhysicalAddress(std::addressof(phys_addr), fp)) {
|
||||
break;
|
||||
}
|
||||
if (!IsHeapPhysicalAddress(phys_addr)) {
|
||||
break;
|
||||
}
|
||||
|
||||
u64 *frame_ptr = GetPointer<u64>(process->GetPageTable().GetHeapVirtualAddress(phys_addr));
|
||||
stack_frame.fp = frame_ptr[0];
|
||||
stack_frame.lr = frame_ptr[1];
|
||||
}
|
||||
|
||||
/* Print and advance. */
|
||||
PrintCodeAddress(process, stack_frame.lr);
|
||||
fp = stack_frame.fp;
|
||||
}
|
||||
} else {
|
||||
/* 32-bit thread. */
|
||||
PrintCodeAddress(process, e_ctx->pc, false);
|
||||
PrintCodeAddress(process, e_ctx->x[14]);
|
||||
|
||||
/* Walk the stack frames. */
|
||||
uintptr_t fp = static_cast<uintptr_t>(e_ctx->x[11]);
|
||||
for (auto i = 0; i < 0x20 && fp != 0 && util::IsAligned(fp, 4); ++i) {
|
||||
/* Read the next frame. */
|
||||
struct {
|
||||
u32 fp;
|
||||
u32 lr;
|
||||
} stack_frame;
|
||||
{
|
||||
KMemoryInfo mem_info;
|
||||
ams::svc::PageInfo page_info;
|
||||
KPhysicalAddress phys_addr;
|
||||
|
||||
/* Read FP */
|
||||
if (R_FAILED(process->GetPageTable().QueryInfo(std::addressof(mem_info), std::addressof(page_info), fp))) {
|
||||
break;
|
||||
}
|
||||
if ((mem_info.GetState() & KMemoryState_FlagReferenceCounted) == 0) {
|
||||
break;
|
||||
}
|
||||
if ((mem_info.GetAttribute() & KMemoryAttribute_Uncached) != 0) {
|
||||
break;
|
||||
}
|
||||
if ((mem_info.GetPermission() & KMemoryPermission_UserRead) != KMemoryPermission_UserRead) {
|
||||
break;
|
||||
}
|
||||
if (!process->GetPageTable().GetPhysicalAddress(std::addressof(phys_addr), fp)) {
|
||||
break;
|
||||
}
|
||||
if (!IsHeapPhysicalAddress(phys_addr)) {
|
||||
break;
|
||||
}
|
||||
|
||||
stack_frame.fp = *GetPointer<u32>(process->GetPageTable().GetHeapVirtualAddress(phys_addr));
|
||||
|
||||
/* Read LR. */
|
||||
uintptr_t lr_ptr = (e_ctx->x[13] <= stack_frame.fp && stack_frame.fp < e_ctx->x[13] + PageSize) ? fp + 4 : fp - 4;
|
||||
if (R_FAILED(process->GetPageTable().QueryInfo(std::addressof(mem_info), std::addressof(page_info), lr_ptr))) {
|
||||
break;
|
||||
}
|
||||
if ((mem_info.GetState() & KMemoryState_FlagReferenceCounted) == 0) {
|
||||
break;
|
||||
}
|
||||
if ((mem_info.GetAttribute() & KMemoryAttribute_Uncached) != 0) {
|
||||
break;
|
||||
}
|
||||
if ((mem_info.GetPermission() & KMemoryPermission_UserRead) != KMemoryPermission_UserRead) {
|
||||
break;
|
||||
}
|
||||
if (!process->GetPageTable().GetPhysicalAddress(std::addressof(phys_addr), lr_ptr)) {
|
||||
break;
|
||||
}
|
||||
if (!IsHeapPhysicalAddress(phys_addr)) {
|
||||
break;
|
||||
}
|
||||
|
||||
stack_frame.lr = *GetPointer<u32>(process->GetPageTable().GetHeapVirtualAddress(phys_addr));
|
||||
}
|
||||
|
||||
/* Print and advance. */
|
||||
PrintCodeAddress(process, stack_frame.lr);
|
||||
fp = stack_frame.fp;
|
||||
}
|
||||
}
|
||||
|
||||
/* Resume the threads that we suspended. */
|
||||
{
|
||||
KScopedSchedulerLock sl;
|
||||
|
||||
auto end = process->GetThreadList().end();
|
||||
for (auto it = process->GetThreadList().begin(); it != end; ++it) {
|
||||
if (std::addressof(*it) != GetCurrentThreadPointer()) {
|
||||
it->Resume(KThread::SuspendType_Backtrace);
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
#else
|
||||
MESOSPHERE_UNUSED(thread);
|
||||
#endif
|
||||
}
|
||||
|
||||
}
|
||||
|
|
|
|||
Loading…
Add table
Add a link
Reference in a new issue