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/*
* Copyright (c) 2020, Luke Wilde <lukew@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include "DisassemblyModel.h"
#include <AK/MappedFile.h>
#include <AK/StringBuilder.h>
#include <LibDebug/DebugSession.h>
#include <LibELF/Image.h>
#include <LibSymbolication/Symbolication.h>
#include <LibX86/Disassembler.h>
#include <LibX86/ELFSymbolProvider.h>
#include <stdio.h>
namespace HackStudio {
DisassemblyModel::DisassemblyModel(const Debug::DebugSession& debug_session, const PtraceRegisters& regs)
{
auto lib = debug_session.library_at(regs.ip());
if (!lib)
return;
auto containing_function = lib->debug_info->get_containing_function(regs.ip() - lib->base_address);
if (!containing_function.has_value()) {
dbgln("Cannot disassemble as the containing function was not found.");
return;
}
OwnPtr<ELF::Image> kernel_elf;
const ELF::Image* elf = nullptr;
auto maybe_kernel_base = Symbolication::kernel_base();
if (maybe_kernel_base.has_value() && containing_function.value().address_low >= maybe_kernel_base.value()) {
auto file_or_error = MappedFile::map("/boot/Kernel.debug");
if (file_or_error.is_error())
return;
kernel_elf = make<ELF::Image>(file_or_error.value()->bytes());
elf = kernel_elf.ptr();
} else {
elf = &lib->debug_info->elf();
}
auto symbol = elf->find_symbol(containing_function.value().address_low);
if (!symbol.has_value())
return;
VERIFY(symbol.has_value());
auto view = symbol.value().raw_data();
X86::ELFSymbolProvider symbol_provider(*elf);
X86::SimpleInstructionStream stream((const u8*)view.characters_without_null_termination(), view.length());
X86::Disassembler disassembler(stream);
size_t offset_into_symbol = 0;
for (;;) {
auto insn = disassembler.next();
if (!insn.has_value())
break;
FlatPtr address_in_profiled_program = symbol.value().value() + offset_into_symbol;
auto disassembly = insn.value().to_string(address_in_profiled_program, &symbol_provider);
StringView instruction_bytes = view.substring_view(offset_into_symbol, insn.value().length());
m_instructions.append({ insn.value(), disassembly, instruction_bytes, address_in_profiled_program });
offset_into_symbol += insn.value().length();
}
}
DisassemblyModel::~DisassemblyModel()
{
}
int DisassemblyModel::row_count(const GUI::ModelIndex&) const
{
return m_instructions.size();
}
String DisassemblyModel::column_name(int column) const
{
switch (column) {
case Column::Address:
return "Address";
case Column::InstructionBytes:
return "Insn Bytes";
case Column::Disassembly:
return "Disassembly";
default:
VERIFY_NOT_REACHED();
return {};
}
}
GUI::Variant DisassemblyModel::data(const GUI::ModelIndex& index, GUI::ModelRole role) const
{
auto& insn = m_instructions[index.row()];
if (role == GUI::ModelRole::Display) {
if (index.column() == Column::Address)
return String::formatted("{:p}", insn.address);
if (index.column() == Column::InstructionBytes) {
StringBuilder builder;
for (auto ch : insn.bytes)
builder.appendff("{:02x} ", static_cast<unsigned char>(ch));
return builder.to_string();
}
if (index.column() == Column::Disassembly)
return insn.disassembly;
return {};
}
return {};
}
}
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