RGBCube/serenity
1
Fork 0
mirror of https://github.com/RGBCube/serenity synced 2025-07-27 01:17:35 +00:00
Code Issues Activity Actions

LibDebug: Support shared libraries

Browse source 
DebugSession now makes the loader stop after loading the libraries,
and parses the loaded libraries of the program before continuing its
execution.

DebugSession now also supports inserting a breakpoint at a given symbol
or source position.
Additionally, DebugInfo now takes the base address of its object into
consideration.
This commit is contained in:
Itamar 2021-01-06 21:49:25 +02:00 • committed by Andreas Kling
parent ca9d6d21b5
commit 4b91e7c821
6 changed files with 328 additions and 53 deletions
Download patch file Download diff file Expand all files Collapse all files

40
Userland/functrace.cpp
View file

@ -84,25 +84,27 @@ static void print_syscall(PtraceRegisters& regs, size_t depth)
static NonnullOwnPtr<HashMap<void*, X86::Instruction>> instrument_code()
{
[[maybe_unused]] auto r = demangle("foo"); // Required for linked with __cxa_demangle
auto instrumented = make<HashMap<void*, X86::Instruction>>();
g_debug_session->elf().for_each_section_of_type(SHT_PROGBITS, [&](const ELF::Image::Section& section) {
if (section.name() != ".text")
return IterationDecision::Continue;
g_debug_session->for_each_loaded_library([&](const Debug::DebugSession::LoadedLibrary& lib) {
lib.debug_info->elf().for_each_section_of_type(SHT_PROGBITS, [&](const ELF::Image::Section& section) {
if (section.name() != ".text")
return IterationDecision::Continue;
X86::SimpleInstructionStream stream((const u8*)((u32)g_debug_session->executable().data() + section.offset()), section.size());
X86::Disassembler disassembler(stream);
for (;;) {
auto offset = stream.offset();
void* instruction_address = (void*)(section.address() + offset);
auto insn = disassembler.next();
if (!insn.has_value())
break;
if (insn.value().mnemonic() == "RET" || insn.value().mnemonic() == "CALL") {
g_debug_session->insert_breakpoint(instruction_address);
instrumented->set(instruction_address, insn.value());
X86::SimpleInstructionStream stream((const u8*)((u32)lib.file.data() + section.offset()), section.size());
X86::Disassembler disassembler(stream);
for (;;) {
auto offset = stream.offset();
void* instruction_address = (void*)(section.address() + offset + lib.base_address);
auto insn = disassembler.next();
if (!insn.has_value())
break;
if (insn.value().mnemonic() == "RET" || insn.value().mnemonic() == "CALL") {
g_debug_session->insert_breakpoint(instruction_address);
instrumented->set(instruction_address, insn.value());
}
}
}
return IterationDecision::Continue;
});
return IterationDecision::Continue;
});
return instrumented;
@ -142,7 +144,7 @@ int main(int argc, char** argv)
size_t depth = 0;
bool new_function = true;
g_debug_session->run([&](Debug::DebugSession::DebugBreakReason reason, Optional<PtraceRegisters> regs) {
g_debug_session->run(Debug::DebugSession::DesiredInitialDebugeeState::Running, [&](Debug::DebugSession::DebugBreakReason reason, Optional<PtraceRegisters> regs) {
if (reason == Debug::DebugSession::DebugBreakReason::Exited) {
outln("Program exited.");
return Debug::DebugSession::DebugDecision::Detach;
@ -154,8 +156,8 @@ int main(int argc, char** argv)
}
if (new_function) {
auto function_name = g_debug_session->elf().symbolicate(regs.value().eip);
print_function_call(function_name, depth);
auto function_name = g_debug_session->symbolicate(regs.value().eip);
print_function_call(function_name.value().symbol, depth);
new_function = false;
return Debug::DebugSession::ContinueBreakAtSyscall;
}