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https://github.com/RGBCube/serenity
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7551a66f73
It was really weird that ELF loading was performed by the ELF::Loader class instead of just being done by the kernel itself. This patch moves all the layout logic from ELF::Loader over to sys$execve(). The kernel no longer cares about ELF::Loader and instead only uses an ELF::Image as an interpreting wrapper around executables.
128 lines
4.2 KiB
C++
128 lines
4.2 KiB
C++
/*
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* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice, this
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* list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "Loader.h"
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#include <AK/Demangle.h>
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#include <AK/Memory.h>
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#include <AK/QuickSort.h>
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//#define Loader_DEBUG
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namespace ELF {
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Loader::Loader(const u8* buffer, size_t size, String&&, bool verbose_logging)
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: m_image(buffer, size, verbose_logging)
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{
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if (m_image.is_valid())
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m_symbol_count = m_image.symbol_count();
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}
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Loader::~Loader()
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{
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}
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#ifndef KERNEL
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Optional<Image::Symbol> Loader::find_symbol(u32 address, u32* out_offset) const
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{
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if (!m_symbol_count)
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return {};
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SortedSymbol* sorted_symbols = nullptr;
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if (m_sorted_symbols.is_empty()) {
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m_sorted_symbols.ensure_capacity(m_symbol_count);
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m_image.for_each_symbol([this](auto& symbol) {
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m_sorted_symbols.append({ symbol.value(), symbol.name(), {}, symbol });
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return IterationDecision::Continue;
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});
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quick_sort(m_sorted_symbols, [](auto& a, auto& b) {
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return a.address < b.address;
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});
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}
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sorted_symbols = m_sorted_symbols.data();
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for (size_t i = 0; i < m_symbol_count; ++i) {
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if (sorted_symbols[i].address > address) {
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if (i == 0)
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return {};
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auto& symbol = sorted_symbols[i - 1];
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if (out_offset)
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*out_offset = address - symbol.address;
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return symbol.symbol;
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}
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}
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return {};
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}
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String Loader::symbolicate(u32 address, u32* out_offset) const
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{
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if (!m_symbol_count) {
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if (out_offset)
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*out_offset = 0;
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return "??";
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}
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SortedSymbol* sorted_symbols = nullptr;
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if (m_sorted_symbols.is_empty()) {
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m_sorted_symbols.ensure_capacity(m_symbol_count);
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m_image.for_each_symbol([this](auto& symbol) {
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m_sorted_symbols.append({ symbol.value(), symbol.name(), {}, {} });
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return IterationDecision::Continue;
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});
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quick_sort(m_sorted_symbols, [](auto& a, auto& b) {
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return a.address < b.address;
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});
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}
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sorted_symbols = m_sorted_symbols.data();
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for (size_t i = 0; i < m_symbol_count; ++i) {
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if (sorted_symbols[i].address > address) {
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if (i == 0) {
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if (out_offset)
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*out_offset = 0;
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return "!!";
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}
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auto& symbol = sorted_symbols[i - 1];
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auto& demangled_name = symbol.demangled_name;
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if (demangled_name.is_null()) {
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demangled_name = demangle(symbol.name);
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}
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if (out_offset) {
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*out_offset = address - symbol.address;
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return demangled_name;
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}
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return String::format("%s +%u", demangled_name.characters(), address - symbol.address);
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}
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}
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if (out_offset)
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*out_offset = 0;
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return "??";
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}
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#endif
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} // end namespace ELF
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