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Profiler: Load the actual kernel binary for disassembly
/boot/Kernel.debug only contains the symbol table and DWARF debug information, and has its `.text` and other PT_LOAD segments stripped out. When we try to parse its data as instructions, we get a crash from within LibX86. We now load the actual /boot/Kernel binary when we want to disassemble kernel functions.
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80b660132c
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1 changed files with 27 additions and 7 deletions
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@ -34,17 +34,36 @@ static Color color_for_percent(int percent)
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return heat_gradient().get_pixel(percent, 0);
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}
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static Optional<MappedObject> s_kernel_binary;
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static ELF::Image* try_load_kernel_binary()
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{
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if (s_kernel_binary.has_value())
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return &s_kernel_binary->elf;
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auto kernel_binary_or_error = MappedFile::map("/boot/Kernel");
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if (!kernel_binary_or_error.is_error()) {
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auto kernel_binary = kernel_binary_or_error.release_value();
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s_kernel_binary = { { kernel_binary, ELF::Image(kernel_binary->bytes()) } };
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return &s_kernel_binary->elf;
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}
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return nullptr;
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}
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DisassemblyModel::DisassemblyModel(Profile& profile, ProfileNode& node)
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: m_profile(profile)
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, m_node(node)
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{
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const ELF::Image* elf;
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FlatPtr base_address = 0;
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OwnPtr<Debug::DebugInfo> debug_info;
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const ELF::Image* elf;
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if (auto maybe_kernel_base = Symbolication::kernel_base(); maybe_kernel_base.has_value() && m_node.address() >= *maybe_kernel_base) {
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if (!g_kernel_debuginfo_object.has_value())
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return;
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elf = &g_kernel_debuginfo_object->elf;
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base_address = maybe_kernel_base.value();
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base_address = maybe_kernel_base.release_value();
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elf = try_load_kernel_binary();
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if (elf == nullptr)
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return;
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debug_info = make<Debug::DebugInfo>(g_kernel_debuginfo_object->elf, String::empty(), base_address);
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} else {
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auto& process = node.process();
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auto library_data = process.library_metadata.library_containing(node.address());
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@ -52,16 +71,17 @@ DisassemblyModel::DisassemblyModel(Profile& profile, ProfileNode& node)
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dbgln("no library data for address {:p}", node.address());
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return;
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}
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elf = &library_data->object->elf;
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base_address = library_data->base;
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elf = &library_data->object->elf;
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debug_info = make<Debug::DebugInfo>(library_data->object->elf, String::empty(), base_address);
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}
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VERIFY(elf != nullptr);
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VERIFY(debug_info != nullptr);
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FlatPtr function_address = node.address() - base_address;
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auto is_function_address = false;
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Debug::DebugInfo debug_info { *elf, {}, base_address };
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auto function = debug_info.get_containing_function(function_address);
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auto function = debug_info->get_containing_function(function_address);
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if (function.has_value()) {
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if (function_address == function->address_low)
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is_function_address = true;
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@ -107,7 +127,7 @@ DisassemblyModel::DisassemblyModel(Profile& profile, ProfileNode& node)
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u32 samples_at_this_instruction = m_node.events_per_address().get(address_in_profiled_program).value_or(0);
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float percent = ((float)samples_at_this_instruction / (float)m_node.event_count()) * 100.0f;
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m_instructions.append({ insn.value(), disassembly, instruction_bytes, address_in_profiled_program, samples_at_this_instruction, percent, debug_info.get_source_position_with_inlines(address_in_profiled_program - base_address) });
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m_instructions.append({ insn.value(), disassembly, instruction_bytes, address_in_profiled_program, samples_at_this_instruction, percent, debug_info->get_source_position_with_inlines(address_in_profiled_program - base_address) });
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offset_into_symbol += insn.value().length();
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}
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