mirror of
https://github.com/Atmosphere-NX/Atmosphere.git
synced 2024-12-25 11:46:05 +00:00
430 lines
18 KiB
C++
430 lines
18 KiB
C++
/*
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* Copyright (c) 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 <stratosphere.hpp>
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#include "creport_modules.hpp"
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#include "creport_utils.hpp"
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namespace ams::creport {
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namespace {
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/* Convenience definitions/types. */
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constexpr size_t ModulePathLengthMax = 0x200;
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constexpr u8 GnuSignature[4] = {'G', 'N', 'U', 0};
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struct ModulePath {
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u32 zero;
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s32 path_length;
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char path[ModulePathLengthMax];
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};
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static_assert(sizeof(ModulePath) == 0x208, "ModulePath definition!");
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struct RoDataStart {
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union {
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u64 deprecated_rwdata_offset;
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ModulePath module_path;
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};
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};
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static_assert(sizeof(RoDataStart) == sizeof(ModulePath), "RoDataStart definition!");
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/* Globals. */
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u8 g_last_rodata_pages[2 * os::MemoryPageSize];
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}
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void ModuleList::SaveToFile(ScopedFile &file) {
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file.WriteFormat(" Number of Modules: %02zu\n", m_num_modules);
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for (size_t i = 0; i < m_num_modules; i++) {
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const auto& module = m_modules[i];
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file.WriteFormat(" Module %02zu:\n", i);
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file.WriteFormat(" Address: %016lx-%016lx\n", module.start_address, module.end_address);
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if (std::strcmp(m_modules[i].name, "") != 0) {
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file.WriteFormat(" Name: %s\n", module.name);
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}
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file.DumpMemory(" Module Id: ", module.module_id, sizeof(module.module_id));
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}
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}
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void ModuleList::FindModulesFromThreadInfo(os::NativeHandle debug_handle, const ThreadInfo &thread, bool is_64_bit) {
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/* Set the debug handle, for access in other member functions. */
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m_debug_handle = debug_handle;
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/* Try to add the thread's PC. */
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this->TryAddModule(thread.GetPC(), is_64_bit);
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/* Try to add the thread's LR. */
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this->TryAddModule(thread.GetLR(), is_64_bit);
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/* Try to add all the addresses in the thread's stacktrace. */
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for (size_t i = 0; i < thread.GetStackTraceSize(); i++) {
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this->TryAddModule(thread.GetStackTrace(i), is_64_bit);
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}
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}
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void ModuleList::TryAddModule(uintptr_t guess, bool is_64_bit) {
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/* Try to locate module from guess. */
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uintptr_t base_address = 0;
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if (!this->TryFindModule(std::addressof(base_address), guess, is_64_bit)) {
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return;
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}
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/* Check whether we already have this module. */
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for (size_t i = 0; i < m_num_modules; i++) {
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if (m_modules[i].start_address <= base_address && base_address < m_modules[i].end_address) {
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return;
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}
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}
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/* Add all contiguous modules. */
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uintptr_t cur_address = base_address;
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while (m_num_modules < ModuleCountMax) {
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/* Get the region extents. */
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svc::MemoryInfo mi;
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svc::PageInfo pi;
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if (R_FAILED(svc::QueryDebugProcessMemory(std::addressof(mi), std::addressof(pi), m_debug_handle, cur_address))) {
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break;
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}
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/* Parse module. */
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if (mi.permission == svc::MemoryPermission_ReadExecute) {
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auto& module = m_modules[m_num_modules++];
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module.start_address = mi.base_address;
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module.end_address = mi.base_address + mi.size;
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GetModuleName(module.name, module.start_address, module.end_address);
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GetModuleId(module.module_id, module.end_address);
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/* Default to no symbol table. */
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module.has_sym_table = false;
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if (std::strcmp(module.name, "") == 0) {
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/* Some homebrew won't have a name. Add a fake one for readability. */
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util::SNPrintf(module.name, sizeof(module.name), "[%02x%02x%02x%02x]", module.module_id[0], module.module_id[1], module.module_id[2], module.module_id[3]);
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} else {
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/* The module has a name, and so might have a symbol table. Try to add it, if it does. */
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if (is_64_bit) {
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DetectModuleSymbolTable(module);
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}
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}
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}
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/* If we're out of readable memory, we're done reading code. */
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if (mi.state == svc::MemoryState_Free || mi.state == svc::MemoryState_Inaccessible) {
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break;
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}
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/* Verify we're not getting stuck in an infinite loop. */
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if (mi.size == 0 || cur_address + mi.size <= cur_address) {
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break;
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}
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cur_address += mi.size;
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}
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}
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bool ModuleList::TryFindModule(uintptr_t *out_address, uintptr_t guess, bool is_64_bit) {
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AMS_UNUSED(is_64_bit);
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/* Query the memory region our guess falls in. */
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svc::MemoryInfo mi;
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svc::PageInfo pi;
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if (R_FAILED(svc::QueryDebugProcessMemory(std::addressof(mi), std::addressof(pi), m_debug_handle, guess))) {
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return false;
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}
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/* If we fall into a RW region, it may be rwdata. Query the region before it, which may be rodata or text. */
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if (mi.permission == svc::MemoryPermission_ReadWrite) {
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if (R_FAILED(svc::QueryDebugProcessMemory(std::addressof(mi), std::addressof(pi), m_debug_handle, mi.base_address - 4))) {
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return false;
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}
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}
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/* If we fall into an RO region, it may be rodata. Query the region before it, which should be text. */
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if (mi.permission == svc::MemoryPermission_Read) {
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if (R_FAILED(svc::QueryDebugProcessMemory(std::addressof(mi), std::addressof(pi), m_debug_handle, mi.base_address - 4))) {
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return false;
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}
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}
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/* We should, at this point, be looking at an executable region (text). */
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if (mi.permission != svc::MemoryPermission_ReadExecute) {
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return false;
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}
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/* Modules are a series of contiguous (text/rodata/rwdata) regions. */
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/* Iterate backwards until we find unmapped memory, to find the start of the set of modules loaded here. */
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while (mi.base_address > 0) {
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if (R_FAILED(svc::QueryDebugProcessMemory(std::addressof(mi), std::addressof(pi), m_debug_handle, mi.base_address - 4))) {
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return false;
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}
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if (mi.state == svc::MemoryState_Free) {
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/* We've found unmapped memory, so output the mapped memory afterwards. */
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*out_address = mi.base_address + mi.size;
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return true;
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}
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}
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/* Something weird happened here. */
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return false;
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}
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void ModuleList::GetModuleName(char *out_name, uintptr_t text_start_address, uintptr_t ro_start_address) {
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/* Clear output. */
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std::memset(out_name, 0, ModuleNameLengthMax);
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/* Read module path from process memory. */
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RoDataStart rodata_start;
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{
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svc::MemoryInfo mi;
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svc::PageInfo pi;
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/* Verify .rodata is read-only. */
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if (R_FAILED(svc::QueryDebugProcessMemory(std::addressof(mi), std::addressof(pi), m_debug_handle, ro_start_address)) || mi.permission != svc::MemoryPermission_Read) {
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return;
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}
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/* Calculate start of rwdata. */
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const u64 rw_start_address = mi.base_address + mi.size;
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/* Read start of .rodata. */
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if (R_FAILED(svc::ReadDebugProcessMemory(reinterpret_cast<uintptr_t>(std::addressof(rodata_start)), m_debug_handle, ro_start_address, sizeof(rodata_start)))) {
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return;
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}
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/* If data is valid under deprecated format, there's no name. */
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if (text_start_address + rodata_start.deprecated_rwdata_offset == rw_start_address) {
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return;
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}
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/* Also validate that we're looking at a valid name. */
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if (rodata_start.module_path.zero != 0 || rodata_start.module_path.path_length <= 0) {
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return;
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}
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}
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/* Start after last slash in path. */
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const char *path = rodata_start.module_path.path;
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int ofs;
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for (ofs = std::min<size_t>(rodata_start.module_path.path_length, sizeof(rodata_start.module_path.path)); ofs >= 0; ofs--) {
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if (path[ofs] == '/' || path[ofs] == '\\') {
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break;
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}
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}
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ofs++;
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/* Copy name to output. */
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const size_t name_size = std::min(ModuleNameLengthMax, std::min<size_t>(rodata_start.module_path.path_length, sizeof(rodata_start.module_path.path)) - ofs);
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std::memcpy(out_name, path + ofs, name_size);
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out_name[ModuleNameLengthMax - 1] = '\x00';
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}
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void ModuleList::GetModuleId(u8 *out, uintptr_t ro_start_address) {
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/* Clear output. */
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std::memset(out, 0, ModuleIdSize);
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/* Verify .rodata is read-only. */
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svc::MemoryInfo mi;
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svc::PageInfo pi;
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if (R_FAILED(svc::QueryDebugProcessMemory(std::addressof(mi), std::addressof(pi), m_debug_handle, ro_start_address)) || mi.permission != svc::MemoryPermission_Read) {
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return;
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}
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/* We want to read the last two pages of .rodata. */
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const size_t read_size = mi.size >= sizeof(g_last_rodata_pages) ? sizeof(g_last_rodata_pages) : (sizeof(g_last_rodata_pages) / 2);
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if (R_FAILED(svc::ReadDebugProcessMemory(reinterpret_cast<uintptr_t>(g_last_rodata_pages), m_debug_handle, mi.base_address + mi.size - read_size, read_size))) {
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return;
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}
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/* Find GNU\x00 to locate start of module id (GNU build id). */
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for (int ofs = read_size - sizeof(GnuSignature) - ModuleIdSize; ofs >= 0; ofs--) {
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if (std::memcmp(g_last_rodata_pages + ofs, GnuSignature, sizeof(GnuSignature)) == 0) {
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std::memcpy(out, g_last_rodata_pages + ofs + sizeof(GnuSignature), ModuleIdSize);
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break;
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}
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}
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}
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void ModuleList::DetectModuleSymbolTable(ModuleInfo &module) {
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/* If we already have a symbol table, no more parsing is needed. */
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if (module.has_sym_table) {
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return;
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}
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/* Declare temporaries. */
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u64 temp_64;
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u32 temp_32;
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/* Get module state. */
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svc::MemoryInfo mi;
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svc::PageInfo pi;
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if (R_FAILED(svc::QueryDebugProcessMemory(std::addressof(mi), std::addressof(pi), m_debug_handle, module.start_address))) {
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return;
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}
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const auto module_state = mi.state;
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/* Verify .rodata is read-only with same state as .text. */
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if (R_FAILED(svc::QueryDebugProcessMemory(std::addressof(mi), std::addressof(pi), m_debug_handle, module.end_address)) || mi.permission != svc::MemoryPermission_Read || mi.state != module_state) {
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return;
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}
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/* We want to find the symbol table/.dynamic. */
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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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/* Locate .dyn using rocrt::ModuleHeader. */
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{
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/* Determine the ModuleHeader offset. */
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u32 mod_offset;
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if (R_FAILED(svc::ReadDebugProcessMemory(reinterpret_cast<uintptr_t>(std::addressof(mod_offset)), m_debug_handle, module.start_address + sizeof(u32), sizeof(u32)))) {
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return;
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}
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/* Read the signature. */
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constexpr u32 SignatureFieldOffset = AMS_OFFSETOF(rocrt::ModuleHeader, signature);
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if (R_FAILED(svc::ReadDebugProcessMemory(reinterpret_cast<uintptr_t>(std::addressof(temp_32)), m_debug_handle, module.start_address + mod_offset + SignatureFieldOffset, sizeof(u32)))) {
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return;
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}
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/* Check that the module signature is expected. */
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if (temp_32 != rocrt::ModuleHeaderVersion) { /* MOD0 */
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return;
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}
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/* Determine the dynamic offset. */
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constexpr u32 DynamicFieldOffset = AMS_OFFSETOF(rocrt::ModuleHeader, dynamic_offset);
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if (R_FAILED(svc::ReadDebugProcessMemory(reinterpret_cast<uintptr_t>(std::addressof(temp_32)), m_debug_handle, module.start_address + mod_offset + DynamicFieldOffset, sizeof(u32)))) {
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return;
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}
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dyn_address = module.start_address + mod_offset + temp_32;
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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 (R_FAILED(svc::ReadDebugProcessMemory(reinterpret_cast<uintptr_t>(std::addressof(temp_64)), m_debug_handle, dyn_address + ofs, sizeof(u64)))) {
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return;
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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 (R_FAILED(svc::ReadDebugProcessMemory(reinterpret_cast<uintptr_t>(std::addressof(temp_64)), m_debug_handle, dyn_address + ofs + sizeof(u64), sizeof(u64)))) {
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return;
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}
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/* Read nchain, to get the number of symbols. */
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if (R_FAILED(svc::ReadDebugProcessMemory(reinterpret_cast<uintptr_t>(std::addressof(temp_32)), m_debug_handle, module.start_address + temp_64 + sizeof(u32), sizeof(u32)))) {
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return;
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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 (R_FAILED(svc::ReadDebugProcessMemory(reinterpret_cast<uintptr_t>(std::addressof(temp_64)), m_debug_handle, dyn_address + ofs + sizeof(u64), sizeof(u64)))) {
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return;
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}
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str_tab = module.start_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 (R_FAILED(svc::ReadDebugProcessMemory(reinterpret_cast<uintptr_t>(std::addressof(temp_64)), m_debug_handle, dyn_address + ofs + sizeof(u64), sizeof(u64)))) {
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return;
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}
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sym_tab = module.start_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;
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}
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module.has_sym_table = true;
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module.sym_tab = sym_tab;
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module.str_tab = str_tab;
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module.num_sym = static_cast<u32>(num_sym);
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}
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const char *ModuleList::GetFormattedAddressString(uintptr_t address) {
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/* Print default formatted string. */
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util::SNPrintf(m_address_str_buf, sizeof(m_address_str_buf), "%016lx", address);
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/* See if the address is inside a module, for pretty-printing. */
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for (size_t i = 0; i < m_num_modules; i++) {
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const auto& module = m_modules[i];
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if (module.start_address <= address && address < module.end_address) {
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if (module.has_sym_table) {
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/* Try to locate an appropriate symbol. */
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for (size_t j = 0; j < module.num_sym; ++j) {
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/* Read symbol from the module's symbol table. */
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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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if (R_FAILED(svc::ReadDebugProcessMemory(reinterpret_cast<uintptr_t>(std::addressof(sym)), m_debug_handle, module.sym_tab + j * sizeof(sym), sizeof(sym)))) {
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break;
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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 = module.start_address + sym.st_value;
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if (func_start <= address && address < func_start + sym.st_size) {
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/* Read the symbol name. */
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const uintptr_t sym_address = module.str_tab + sym.st_name;
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char sym_name[0x80];
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if (R_FAILED(svc::ReadDebugProcessMemory(reinterpret_cast<uintptr_t>(sym_name), m_debug_handle, sym_address, sizeof(sym_name)))) {
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break;
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}
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/* Ensure null-termination. */
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sym_name[sizeof(sym_name) - 1] = '\x00';
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/* Print the symbol. */
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util::SNPrintf(m_address_str_buf, sizeof(m_address_str_buf), "%016lx (%s + 0x%lx) (%s + 0x%lx)", address, module.name, address - module.start_address, sym_name, address - func_start);
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return m_address_str_buf;
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}
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}
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}
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util::SNPrintf(m_address_str_buf, sizeof(m_address_str_buf), "%016lx (%s + 0x%lx)", address, module.name, address - module.start_address);
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return m_address_str_buf;
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}
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}
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return m_address_str_buf;
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}
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}
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