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LibELF: Add a find_symbol() API that finds a Symbol for an address
Also add ELFImage::Symbol::raw_data() to get a StringView containing the entire symbol contents.
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4 changed files with 60 additions and 1 deletions
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@ -151,6 +151,56 @@ char* ELFLoader::symbol_ptr(const char* name)
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return found_ptr;
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}
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#ifndef KERNEL
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Optional<ELFImage::Symbol> ELFLoader::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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#ifdef KERNEL
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if (!m_sorted_symbols_region) {
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m_sorted_symbols_region = MM.allocate_kernel_region(PAGE_ROUND_UP(m_symbol_count * sizeof(SortedSymbol)), "Sorted symbols", Kernel::Region::Access::Read | Kernel::Region::Access::Write);
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sorted_symbols = (SortedSymbol*)m_sorted_symbols_region->vaddr().as_ptr();
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size_t index = 0;
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m_image.for_each_symbol([&](auto& symbol) {
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sorted_symbols[index++] = { symbol.value(), symbol.name() };
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return IterationDecision::Continue;
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});
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quick_sort(sorted_symbols, sorted_symbols + m_symbol_count, [](auto& a, auto& b) {
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return a.address < b.address;
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});
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} else {
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sorted_symbols = (SortedSymbol*)m_sorted_symbols_region->vaddr().as_ptr();
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}
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#else
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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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#endif
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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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#endif
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String ELFLoader::symbolicate(u32 address, u32* out_offset) const
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{
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if (!m_symbol_count) {
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@ -178,7 +228,7 @@ String ELFLoader::symbolicate(u32 address, u32* out_offset) const
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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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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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