mirror of
https://github.com/Atmosphere-NX/Atmosphere.git
synced 2024-11-27 14:22:17 +00:00
292 lines
12 KiB
C++
292 lines
12 KiB
C++
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/*
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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 "diag_symbol_impl.hpp"
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#include <cxxabi.h>
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extern "C" {
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void __module_offset_helper() { /* ... */ }
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}
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namespace ams::diag::impl {
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namespace {
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class CurrentExecutableHelper {
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private:
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struct SymbolInfo {
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uintptr_t address;
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const char *name;
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};
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private:
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os::NativeHandle m_file_handle;
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os::NativeHandle m_map_handle;
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void *m_file_map;
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size_t m_file_size;
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SymbolInfo *m_symbols;
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size_t m_num_symbol;
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uintptr_t m_module_address;
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size_t m_module_size;
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uintptr_t m_module_displacement;
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private:
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CurrentExecutableHelper() : m_file_handle(INVALID_HANDLE_VALUE), m_map_handle(INVALID_HANDLE_VALUE), m_file_map(nullptr), m_file_size(0), m_symbols(nullptr), m_num_symbol(0), m_module_address(0), m_module_size(0), m_module_displacement(0) {
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/* Open the current executable. */
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auto exe_handle = OpenExecutableFile();
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if (exe_handle == INVALID_HANDLE_VALUE) {
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return;
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}
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ON_SCOPE_EXIT { if (exe_handle != INVALID_HANDLE_VALUE) { ::CloseHandle(exe_handle); } };
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/* Get the exe size. */
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LARGE_INTEGER exe_size_li;
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if (::GetFileSizeEx(exe_handle, std::addressof(exe_size_li)) == 0) {
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return;
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}
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/* Check the exe size. */
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s64 exe_size = exe_size_li.QuadPart;
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if (exe_size == 0) {
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return;
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}
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/* Create a file mapping. */
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auto map_handle = ::CreateFileMappingW(exe_handle, nullptr, PAGE_READONLY, 0, 0, nullptr);
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if (map_handle == INVALID_HANDLE_VALUE) {
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return;
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}
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ON_SCOPE_EXIT { if (map_handle != INVALID_HANDLE_VALUE) { ::CloseHandle(map_handle); } };
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/* Map the file. */
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void *exe_map = ::MapViewOfFile(map_handle, FILE_MAP_READ, 0, 0, 0);
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if (exe_map == nullptr) {
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return;
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}
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ON_SCOPE_EXIT { if (exe_map != nullptr) { ::UnmapViewOfFile(exe_map); } };
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/* Get/parse the DOS header. */
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const uintptr_t exe_start = reinterpret_cast<uintptr_t>(exe_map);
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const auto *dos_header = reinterpret_cast<const IMAGE_DOS_HEADER *>(exe_start);
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if (dos_header->e_magic != IMAGE_DOS_SIGNATURE) {
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return;
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}
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/* Set up the nt headers. */
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const auto *nt32 = reinterpret_cast<const IMAGE_NT_HEADERS32 *>(exe_start + dos_header->e_lfanew);
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const auto *nt64 = reinterpret_cast<const IMAGE_NT_HEADERS64 *>(exe_start + dos_header->e_lfanew);
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if (nt32->FileHeader.Machine == IMAGE_FILE_MACHINE_AMD64 || nt32->FileHeader.Machine == IMAGE_FILE_MACHINE_IA64) {
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nt32 = nullptr;
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} else {
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nt64 = nullptr;
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}
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#define EXE_NT_HEADER(x) ((nt64 != nullptr) ? nt64->x : nt32->x)
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if (EXE_NT_HEADER(Signature) != IMAGE_NT_SIGNATURE) {
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return;
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}
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/* Check that the optional header is really present. */
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if (EXE_NT_HEADER(FileHeader.SizeOfOptionalHeader) < sizeof(IMAGE_OPTIONAL_HEADER32)) {
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return;
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}
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/* Get sections. */
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const auto *sec = nt64 != nullptr ? IMAGE_FIRST_SECTION(nt64) : IMAGE_FIRST_SECTION(nt32);
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/* Get the symbol table. */
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const auto *symtab = reinterpret_cast<const IMAGE_SYMBOL *>(exe_start + EXE_NT_HEADER(FileHeader.PointerToSymbolTable));
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const size_t nsym = EXE_NT_HEADER(FileHeader.NumberOfSymbols);
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const char *strtab = reinterpret_cast<const char *>(symtab + nsym);
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/* Find the section containing our code. */
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int text_section = -1;
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for (size_t i = 0; i < nsym; ++i) {
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if (ISFCN(symtab[i].Type)) {
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const char *name = symtab[i].N.Name.Short == 0 ? strtab + symtab[i].N.Name.Long : reinterpret_cast<const char *>(symtab[i].N.ShortName);
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if (std::strcmp(name, "__module_offset_helper") == 0) {
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AMS_ASSERT(text_section == -1);
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AMS_ASSERT(m_module_displacement == 0);
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m_module_displacement = reinterpret_cast<uintptr_t>(&__module_offset_helper) - symtab[i].Value;
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text_section = symtab[i].SectionNumber;
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AMS_ASSERT(m_module_displacement != 0);
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AMS_ASSERT(text_section != -1);
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break;
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}
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}
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}
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/* Determine the number of functions. */
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size_t funcs = 0;
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for (size_t i = 0; i < nsym; ++i) {
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if (ISFCN(symtab[i].Type) && symtab[i].SectionNumber == text_section) {
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++funcs;
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}
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}
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/* Allocate functions. */
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m_symbols = reinterpret_cast<SymbolInfo *>(std::malloc(sizeof(SymbolInfo) * funcs));
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if (m_symbols == nullptr) {
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return;
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}
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/* Set all symbols. */
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m_num_symbol = 0;
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for (size_t i = 0; i < nsym; ++i) {
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if (ISFCN(symtab[i].Type) && symtab[i].SectionNumber == text_section) {
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m_symbols[m_num_symbol].address = symtab[i].Value;
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m_symbols[m_num_symbol].name = symtab[i].N.Name.Short == 0 ? strtab + symtab[i].N.Name.Long : reinterpret_cast<const char *>(symtab[i].N.ShortName);
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++m_num_symbol;
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}
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}
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AMS_ASSERT(m_num_symbol == funcs);
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/* Sort the symbols. */
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std::sort(m_symbols + 0, m_symbols + m_num_symbol, [] (const SymbolInfo &lhs, const SymbolInfo &rhs) {
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return lhs.address < rhs.address;
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});
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m_module_address = 0;
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m_module_size = sec[text_section - 1].Misc.VirtualSize;
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if (m_module_displacement != 0 && m_module_size > 0 && m_num_symbol > 0) {
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std::swap(m_file_handle, exe_handle);
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std::swap(m_map_handle, map_handle);
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std::swap(m_file_map, exe_map);
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m_file_size = exe_size;
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}
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}
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~CurrentExecutableHelper() {
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if (m_file_map != nullptr) {
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::UnmapViewOfFile(m_file_map);
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}
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if (m_map_handle != nullptr) {
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::CloseHandle(m_map_handle);
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}
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if (m_file_handle != nullptr) {
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::CloseHandle(m_file_handle);
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}
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}
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public:
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static CurrentExecutableHelper &GetInstance() {
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AMS_FUNCTION_LOCAL_STATIC(CurrentExecutableHelper, s_current_executable_helper_instance);
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return s_current_executable_helper_instance;
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}
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private:
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size_t GetSymbolSizeImpl(const SymbolInfo *symbol) const {
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/* Do our best to guess. */
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if (symbol != m_symbols + m_num_symbol - 1) {
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return (symbol + 1)->address - symbol->address;
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} else if (m_module_address + m_module_size >= symbol->address) {
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return m_module_address + m_module_size - symbol->address;
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} else {
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return 0;
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}
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}
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const SymbolInfo *GetBestSymbol(uintptr_t address) const {
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address -= m_module_displacement;
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const SymbolInfo *best_symbol = std::lower_bound(m_symbols + 0, m_symbols + m_num_symbol, address, [](const SymbolInfo &lhs, uintptr_t rhs) {
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return lhs.address < rhs;
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});
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if (best_symbol == m_symbols + m_num_symbol) {
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return nullptr;
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}
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if (best_symbol->address != address && best_symbol > m_symbols) {
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--best_symbol;
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}
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const auto vma = best_symbol->address;
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const auto end = vma + this->GetSymbolSizeImpl(best_symbol);
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if (vma <= address && address < end) {
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return best_symbol;
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} else {
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return nullptr;
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}
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}
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public:
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uintptr_t GetSymbolName(char *dst, size_t dst_size, uintptr_t address) const {
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if (m_file_handle == INVALID_HANDLE_VALUE) {
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return 0;
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}
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/* Get the symbol. */
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const auto *symbol = this->GetBestSymbol(address);
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if (symbol == nullptr) {
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return 0;
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}
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/* Print the symbol. */
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const char *name = symbol->name;
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int cpp_name_status = 0;
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if (char *demangled = abi::__cxa_demangle(name, nullptr, 0, std::addressof(cpp_name_status)); cpp_name_status == 0) {
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AMS_ASSERT(demangled != nullptr);
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util::TSNPrintf(dst, dst_size, "%s", demangled);
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std::free(demangled);
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} else {
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util::TSNPrintf(dst, dst_size, "%s", name);
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}
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return symbol->address + m_module_displacement;
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}
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size_t GetSymbolSize(uintptr_t address) const {
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if (m_file_handle == INVALID_HANDLE_VALUE) {
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return 0;
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}
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/* Get the symbol. */
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const auto *symbol = this->GetBestSymbol(address);
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if (symbol == nullptr) {
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return 0;
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}
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return this->GetSymbolSizeImpl(symbol);
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}
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private:
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static os::NativeHandle OpenExecutableFile() {
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/* Get the module file name. */
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wchar_t module_file_name[0x1000];
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if (::GetModuleFileNameW(0, module_file_name, util::size(module_file_name)) == 0) {
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return INVALID_HANDLE_VALUE;
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}
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return ::CreateFileW(module_file_name, GENERIC_READ, FILE_SHARE_READ, nullptr, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, nullptr);
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}
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};
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}
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uintptr_t GetSymbolNameImpl(char *dst, size_t dst_size, uintptr_t address) {
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return CurrentExecutableHelper::GetInstance().GetSymbolName(dst, dst_size, address);
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}
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size_t GetSymbolSizeImpl(uintptr_t address) {
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return CurrentExecutableHelper::GetInstance().GetSymbolSize(address);
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}
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}
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