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Kernel+LibCoreDump: Implement more x86_64 coredump functionality

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This commit is contained in:
Gunnar Beutner 2021-06-29 17:48:01 +02:00 • committed by Andreas Kling
parent d3127efc01
commit 2016354c12
4 changed files with 38 additions and 18 deletions
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42
Userland/Libraries/LibCoreDump/Backtrace.cpp
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@ -43,6 +43,10 @@ static const ELFObjectInfo* object_info_for_region(const ELF::Core::MemoryRegion
return nullptr;
auto image = make<ELF::Image>(file_or_error.value()->bytes());
#if !ARCH(I386)
// FIXME: Fix LibDebug
return nullptr;
#endif
auto info = make<ELFObjectInfo>(file_or_error.release_value(), make<Debug::DebugInfo>(move(image)));
auto* info_ptr = info.ptr();
s_debug_info_cache.set(path, move(info));
@ -52,30 +56,33 @@ static const ELFObjectInfo* object_info_for_region(const ELF::Core::MemoryRegion
Backtrace::Backtrace(const Reader& coredump, const ELF::Core::ThreadInfo& thread_info)
: m_thread_info(move(thread_info))
{
FlatPtr* bp;
FlatPtr* ip;
#if ARCH(I386)
uint32_t* ebp = (uint32_t*)m_thread_info.regs.ebp;
uint32_t* eip = (uint32_t*)m_thread_info.regs.eip;
bp = (FlatPtr*)m_thread_info.regs.ebp;
ip = (FlatPtr*)m_thread_info.regs.eip;
#else
bp = (FlatPtr*)m_thread_info.regs.rbp;
ip = (FlatPtr*)m_thread_info.regs.rip;
#endif
bool first_frame = true;
while (ebp && eip) {
while (bp && ip) {
// We use eip - 1 because the return address from a function frame
// is the instruction that comes after the 'call' instruction.
// However, because the first frame represents the faulting
// instruction rather than the return address we don't subtract
// 1 there.
VERIFY((FlatPtr)eip > 0);
add_entry(coredump, (FlatPtr)eip - (first_frame ? 0 : 1));
VERIFY((FlatPtr)ip > 0);
add_entry(coredump, (FlatPtr)ip - (first_frame ? 0 : 1));
first_frame = false;
auto next_eip = coredump.peek_memory((FlatPtr)(ebp + 1));
auto next_ebp = coredump.peek_memory((FlatPtr)(ebp));
if (!next_eip.has_value() || !next_ebp.has_value())
auto next_ip = coredump.peek_memory((FlatPtr)(bp + 1));
auto next_bp = coredump.peek_memory((FlatPtr)(bp));
if (!next_ip.has_value() || !next_bp.has_value())
break;
eip = (uint32_t*)next_eip.value();
ebp = (uint32_t*)next_ebp.value();
ip = (FlatPtr*)next_ip.value();
bp = (FlatPtr*)next_bp.value();
}
#else
(void)coredump;
TODO();
#endif
}
Backtrace::~Backtrace()
@ -96,9 +103,14 @@ void Backtrace::add_entry(const Reader& coredump, FlatPtr eip)
if (!object_info)
return;
#if ARCH(I386)
auto function_name = object_info->debug_info->elf().symbolicate(eip - region->region_start);
auto source_position = object_info->debug_info->get_source_position_with_inlines(eip - region->region_start);
#else
// FIXME: Fix symbolication.
auto function_name = "";
Debug::DebugInfo::SourcePositionWithInlines source_position;
#endif
m_entries.append({ eip, object_name, function_name, source_position });
}