mirror of
https://github.com/Atmosphere-NX/Atmosphere.git
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266 lines
11 KiB
C++
266 lines
11 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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u32 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: %zu\n", this->num_modules);
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for (size_t i = 0; i < this->num_modules; i++) {
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const auto& module = this->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(this->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(" Build Id: ", &module.build_id[0], sizeof(module.build_id));
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}
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}
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void ModuleList::FindModulesFromThreadInfo(os::NativeHandle debug_handle, const ThreadInfo &thread) {
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/* Set the debug handle, for access in other member functions. */
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this->debug_handle = debug_handle;
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/* Try to add the thread's PC. */
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this->TryAddModule(thread.GetPC());
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/* Try to add the thread's LR. */
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this->TryAddModule(thread.GetLR());
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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));
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}
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}
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void ModuleList::TryAddModule(uintptr_t guess) {
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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(&base_address, guess)) {
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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 < this->num_modules; i++) {
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if (this->modules[i].start_address <= base_address && base_address < this->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 (this->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(&mi, &pi, this->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 = this->modules[this->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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GetModuleBuildId(module.build_id, module.end_address);
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/* Some homebrew won't have a name. Add a fake one for readability. */
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if (std::strcmp(module.name, "") == 0) {
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util::SNPrintf(module.name, sizeof(module.name), "[%02x%02x%02x%02x]", module.build_id[0], module.build_id[1], module.build_id[2], module.build_id[3]);
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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) {
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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(&mi, &pi, this->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(&mi, &pi, 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(&mi, &pi, 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(&mi, &pi, 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(&mi, &pi, this->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)), this->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 != strnlen(rodata_start.module_path.path, sizeof(rodata_start.module_path.path))) {
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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 = rodata_start.module_path.path_length; 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, sizeof(rodata_start.module_path.path) - ofs);
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std::strncpy(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::GetModuleBuildId(u8 *out_build_id, uintptr_t ro_start_address) {
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/* Clear output. */
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std::memset(out_build_id, 0, ModuleBuildIdLength);
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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(&mi, &pi, this->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), this->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 build id. */
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for (int ofs = read_size - sizeof(GnuSignature) - ModuleBuildIdLength; 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_build_id, g_last_rodata_pages + ofs + sizeof(GnuSignature), ModuleBuildIdLength);
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break;
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}
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}
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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(this->address_str_buf, sizeof(this->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 < this->num_modules; i++) {
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const auto& module = this->modules[i];
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if (module.start_address <= address && address < module.end_address) {
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util::SNPrintf(this->address_str_buf, sizeof(this->address_str_buf), "%016lx (%s + 0x%lx)", address, module.name, address - module.start_address);
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break;
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}
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}
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return this->address_str_buf;
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}
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}
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