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UserspaceEmulator: Symbolicate disassembly output :^)

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Since we have the ELF executable handy, we can actually symbolicate the
disassembly trace output really easily. Very cool! :^)
This commit is contained in:
Andreas Kling 2020-07-11 17:18:07 +02:00
parent dc66d70369
commit 0f63d8c9b4
3 changed files with 31 additions and 10 deletions
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31
DevTools/UserspaceEmulator/Emulator.cpp
View file

@ -92,8 +92,9 @@ private:
u8* m_data { nullptr };
};
Emulator::Emulator()
: m_cpu(*this)
Emulator::Emulator(NonnullRefPtr<ELF::Loader> elf)
: m_elf(move(elf))
, m_cpu(*this)
{
setup_stack();
}
@ -110,9 +111,9 @@ void Emulator::setup_stack()
m_cpu.push32(0);
}
bool Emulator::load_elf(const ELF::Loader& elf)
bool Emulator::load_elf()
{
elf.image().for_each_program_header([&](const ELF::Image::ProgramHeader& program_header) {
m_elf->image().for_each_program_header([&](const ELF::Image::ProgramHeader& program_header) {
if (program_header.type() != PT_LOAD)
return;
auto region = make<SimpleRegion>(program_header.vaddr().get(), program_header.size_in_memory());
@ -120,16 +121,34 @@ bool Emulator::load_elf(const ELF::Loader& elf)
mmu().add_region(move(region));
});
m_cpu.set_eip(elf.image().entry().get());
m_cpu.set_eip(m_elf->image().entry().get());
return true;
}
class ELFSymbolProvider final : public X86::SymbolProvider {
public:
ELFSymbolProvider(ELF::Loader& loader)
: m_loader(loader)
{
}
virtual String symbolicate(FlatPtr address, u32* offset = nullptr) const
{
return m_loader.symbolicate(address, offset);
}
private:
ELF::Loader& m_loader;
};
int Emulator::exec()
{
ELFSymbolProvider symbol_provider(*m_elf);
while (!m_shutdown) {
auto base_eip = m_cpu.eip();
auto insn = X86::Instruction::from_stream(m_cpu, true, true);
out() << (const void*)base_eip << " \033[33;1m" << insn.to_string(base_eip) << "\033[0m";
out() << (const void*)base_eip << " \033[33;1m" << insn.to_string(base_eip, &symbol_provider) << "\033[0m";
(m_cpu.*insn.handler())(insn);
m_cpu.dump();

6
DevTools/UserspaceEmulator/Emulator.h
View file

@ -37,9 +37,9 @@ namespace UserspaceEmulator {
class Emulator {
public:
Emulator();
explicit Emulator(NonnullRefPtr<ELF::Loader>);
bool load_elf(const ELF::Loader&);
bool load_elf();
int exec();
u32 virt_syscall(u32 function, u32 arg1, u32 arg2, u32 arg3);
@ -47,6 +47,8 @@ public:
SoftMMU& mmu() { return m_mmu; }
private:
NonnullRefPtr<ELF::Loader> m_elf;
SoftMMU m_mmu;
SoftCPU m_cpu;

4
DevTools/UserspaceEmulator/main.cpp
View file

@ -47,8 +47,8 @@ int main(int argc, char** argv)
auto elf = ELF::Loader::create((const u8*)mapped_file.data(), mapped_file.size());
UserspaceEmulator::Emulator emulator;
if (!emulator.load_elf(*elf))
UserspaceEmulator::Emulator emulator(move(elf));
if (!emulator.load_elf())
return 1;
return emulator.exec();