mirror of
https://github.com/Atmosphere-NX/Atmosphere.git
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318 lines
13 KiB
C++
318 lines
13 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 "diag_symbol_impl.hpp"
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#include <unistd.h>
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#include <mach-o/dyld.h>
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#include <mach-o/loader.h>
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#include <mach-o/nlist.h>
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#include <mach-o/stab.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <sys/param.h>
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#include <sys/mman.h>
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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_fd;
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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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const char *m_module_name;
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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_fd(-1), m_file_map(nullptr), m_file_size(0), m_symbols(nullptr), m_num_symbol(0), m_module_name(nullptr), m_module_address(0), m_module_size(0), m_module_displacement(0) {
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/* Get the current executable name. */
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char exe_path[4_KB] = {};
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GetExecutablePath(exe_path, sizeof(exe_path));
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/* Open the current executable. */
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os::NativeHandle fd;
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do {
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fd = ::open(exe_path, O_RDONLY);
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} while (fd < 0 && errno == EINTR);
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if (fd < 0) {
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return;
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}
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ON_SCOPE_EXIT { if (fd >= 0) { s32 ret; do { ret = ::close(fd); } while (ret < 0 && errno == EINTR); } };
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/* Get the file size. */
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struct stat st;
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if (fstat(fd, std::addressof(st)) < 0) {
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return;
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}
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/* Check that the file can be mapped. */
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const size_t exe_size = st.st_size;
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if (exe_size == 0) {
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return;
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}
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/* Map the executable. */
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void *exe_map = mmap(nullptr, exe_size, PROT_READ, MAP_PRIVATE, fd, 0);
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if (exe_map == MAP_FAILED) {
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return;
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}
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ON_SCOPE_EXIT { if (exe_map != nullptr) { munmap(exe_map, exe_size); } };
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/* Get the file's u32 magic. */
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const uintptr_t exe_start = reinterpret_cast<uintptr_t>(exe_map);
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const u32 magic = *reinterpret_cast<const u32 *>(exe_start);
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/* Get/parse the mach header. */
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u32 ncmds;
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bool is_64;
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if (magic == MH_MAGIC) {
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const auto *header = reinterpret_cast<const struct mach_header *>(exe_start);
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ncmds = header->ncmds;
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is_64 = false;
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} else if (magic == MH_MAGIC_64) {
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const auto *header = reinterpret_cast<const struct mach_header_64 *>(exe_start);
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ncmds = header->ncmds;
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is_64 = true;
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} else {
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return;
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}
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/* Find the symbol load command. */
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const auto *lc = reinterpret_cast<const struct load_command *>(exe_start + (is_64 ? sizeof(struct mach_header_64) : sizeof(struct mach_header)));
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for (u32 i = 0; i < ncmds; ++i) {
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/* If we encounter the symbol table, parse it. */
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if (lc->cmd == LC_SYMTAB) {
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if (is_64) {
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this->ParseSymbolTable<struct nlist_64>(exe_start, reinterpret_cast<const struct symtab_command *>(lc));
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} else {
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this->ParseSymbolTable<struct nlist>(exe_start, reinterpret_cast<const struct symtab_command *>(lc));
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}
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break;
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} else if (lc->cmd == LC_SEGMENT) {
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const auto *sc = reinterpret_cast<const struct segment_command *>(lc);
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if (std::strcmp(sc->segname, "__TEXT") == 0) {
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AMS_ASSERT(m_module_address == 0);
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m_module_address = sc->vmaddr;
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m_module_size = sc->vmsize;
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AMS_ASSERT(m_module_address != 0);
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}
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} else if (lc->cmd == LC_SEGMENT_64) {
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const auto *sc = reinterpret_cast<const struct segment_command_64 *>(lc);
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if (std::strcmp(sc->segname, "__TEXT") == 0) {
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AMS_ASSERT(m_module_address == 0);
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m_module_address = sc->vmaddr;
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m_module_size = sc->vmsize;
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AMS_ASSERT(m_module_address != 0);
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}
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}
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/* Advance to the next load command. */
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lc = reinterpret_cast<const struct load_command *>(reinterpret_cast<uintptr_t>(lc) + lc->cmdsize);
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}
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for (size_t i = 0; i < m_num_symbol; ++i) {
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if (std::strcmp(m_symbols[i].name, "___module_offset_helper") == 0) {
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m_module_displacement = reinterpret_cast<uintptr_t>(&__module_offset_helper) - m_symbols[i].address;
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break;
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}
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}
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if (m_module_address > 0 && m_module_size > 0 && m_num_symbol > 0) {
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std::swap(m_fd, fd);
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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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munmap(m_file_map, m_file_size);
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}
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if (m_fd >= 0) {
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s32 ret;
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do { ret = ::close(m_fd); } while (ret < 0 && errno == EINTR);
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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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template<typename NlistType>
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void ParseSymbolTable(uintptr_t exe_start, const struct symtab_command *c) {
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/* Check pre-conditions. */
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AMS_ASSERT(m_fd == -1);
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AMS_ASSERT(m_file_map == nullptr);
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AMS_ASSERT(m_symbols == nullptr);
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/* Get the strtab/symtab. */
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const auto *symtab = reinterpret_cast<const NlistType *>(exe_start + c->symoff);
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const char *strtab = reinterpret_cast<const char *>(exe_start + c->stroff);
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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 < c->nsyms; ++i) {
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if (symtab[i].n_type != N_FUN || symtab[i].n_sect == NO_SECT) {
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continue;
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}
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++funcs;
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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 < c->nsyms; ++i) {
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if (symtab[i].n_type != N_FUN || symtab[i].n_sect == NO_SECT) {
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continue;
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}
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m_symbols[m_num_symbol].address = symtab[i].n_value;
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m_symbols[m_num_symbol].name = strtab + symtab[i].n_un.n_strx;
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++m_num_symbol;
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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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}
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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_fd < 0) {
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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_fd < 0) {
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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 void GetExecutablePath(char *dst, size_t dst_size) {
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u32 len = dst_size;
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if (_NSGetExecutablePath(dst, std::addressof(len)) != 0) {
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dst[0] = 0;
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return;
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}
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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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