mirror of
https://github.com/Atmosphere-NX/Atmosphere.git
synced 2024-12-19 08:52:25 +00:00
241 lines
9.2 KiB
C++
241 lines
9.2 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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#define PACKAGE "stratosphere"
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#define PACKAGE_VERSION STRINGIFY(ATMOSPHERE_RELEASE_VERSION_MAJOR.ATMOSPHERE_RELEASE_VERSION_MINOR.ATMOSPHERE_RELEASE_VERSION_MICRO)
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#if defined(ATMOSPHERE_OS_LINUX)
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#include <bfd.h>
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#include <unistd.h>
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#include <dlfcn.h>
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#include <link.h>
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extern "C" char __init_array_start;
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#endif
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#include <cxxabi.h>
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namespace ams::diag::impl {
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namespace {
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class BfdHelper {
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private:
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bfd *m_handle;
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asymbol **m_symbol;
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size_t m_num_symbol;
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size_t m_num_func_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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private:
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BfdHelper() : m_handle(nullptr), m_symbol(nullptr), m_module_name(nullptr) {
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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 bfd. */
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bfd *b = ::bfd_openr(exe_path, 0);
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if (b == nullptr) {
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return;
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}
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auto bfd_guard = SCOPE_GUARD { ::bfd_close(b); };
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/* Check the format. */
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if (!::bfd_check_format(b, bfd_object)) {
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return;
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}
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/* Verify the file has symbols. */
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if ((bfd_get_file_flags(b) & HAS_SYMS) == 0) {
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return;
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}
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/* Read the symbols. */
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unsigned int _;
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void *symbol_table;
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s64 num_symbols = bfd_read_minisymbols(b, false, std::addressof(symbol_table), std::addressof(_));
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if (num_symbols == 0) {
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num_symbols = bfd_read_minisymbols(b, true, std::addressof(symbol_table), std::addressof(_));
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if (num_symbols < 0) {
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return;
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}
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}
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/* We successfully got the symbol table. */
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bfd_guard.Cancel();
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m_handle = b;
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m_symbol = reinterpret_cast<asymbol **>(symbol_table);
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m_num_symbol = static_cast<size_t>(num_symbols);
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/* Sort the symbol table. */
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std::sort(m_symbol + 0, m_symbol + m_num_symbol, [] (asymbol *lhs, asymbol *rhs) {
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const bool l_func = (lhs->flags & BSF_FUNCTION);
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const bool r_func = (rhs->flags & BSF_FUNCTION);
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if (l_func == r_func) {
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return bfd_asymbol_value(lhs) < bfd_asymbol_value(rhs);
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} else {
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return l_func;
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}
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});
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/* Determine number of function symbols. */
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m_num_func_symbol = 0;
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for (size_t i = 0; i < m_num_symbol; ++i) {
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if ((m_symbol[i]->flags & BSF_FUNCTION) == 0) {
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m_num_func_symbol = i;
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break;
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}
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}
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for (int i = std::strlen(exe_path) - 1; i >= 0; --i) {
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if (exe_path[i] == '/' || exe_path[i] == '\\') {
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m_module_name = strdup(exe_path + i + 1);
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break;
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}
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}
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/* Get our module base/size. */
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#if defined(ATMOSPHERE_OS_LINUX)
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{
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m_module_address = _r_debug.r_map->l_addr;
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m_module_size = reinterpret_cast<uintptr_t>(std::addressof(__init_array_start)) - m_module_address;
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}
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#endif
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}
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~BfdHelper() {
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if (m_symbol != nullptr) {
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std::free(m_symbol);
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}
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if (m_handle != nullptr) {
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::bfd_close(m_handle);
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}
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}
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public:
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static BfdHelper &GetInstance() {
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AMS_FUNCTION_LOCAL_STATIC(BfdHelper, s_bfd_helper_instance);
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return s_bfd_helper_instance;
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}
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private:
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size_t GetSymbolSizeImpl(asymbol **symbol) const {
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/* Do our best to guess. */
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const auto vma = bfd_asymbol_value(*symbol);
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if (symbol != m_symbol + m_num_func_symbol - 1) {
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return bfd_asymbol_value(*(symbol + 1)) - vma;
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} else {
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const auto *sec = (*symbol)->section;
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return (sec->vma + sec->size) - vma;
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}
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}
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std::ptrdiff_t GetSymbolAddressDisplacement(uintptr_t address) const {
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std::ptrdiff_t displacement = 0;
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if (m_module_address <= address && address < m_module_address + m_module_size) {
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displacement = m_module_address;
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}
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return displacement;
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}
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asymbol **GetBestSymbol(uintptr_t address) const {
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/* Adjust the symbol address. */
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address -= this->GetSymbolAddressDisplacement(address);
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asymbol **best_symbol = std::lower_bound(m_symbol + 0, m_symbol + m_num_func_symbol, address, [](asymbol *lhs, uintptr_t rhs) {
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return bfd_asymbol_value(lhs) < rhs;
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});
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if (best_symbol == m_symbol + m_num_func_symbol) {
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return nullptr;
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}
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if (bfd_asymbol_value(*best_symbol) != address && best_symbol > m_symbol) {
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--best_symbol;
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}
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const auto vma = bfd_asymbol_value(*best_symbol);
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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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/* Get the symbol. */
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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 = bfd_asymbol_name(*symbol);
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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 bfd_asymbol_value(*symbol) + this->GetSymbolAddressDisplacement(address);
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}
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size_t GetSymbolSize(uintptr_t address) const {
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/* Get the symbol. */
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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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#if defined(ATMOSPHERE_OS_LINUX)
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{
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if (::readlink("/proc/self/exe", dst, dst_size) == -1) {
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dst[0] = 0;
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return;
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}
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}
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#else
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#error "Unknown OS for BfdHelper GetExecutablePath"
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#endif
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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 BfdHelper::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 BfdHelper::GetInstance().GetSymbolSize(address);
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}
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}
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