mirrors/ladybird
1
0
Fork 0
mirror of https://github.com/LadybirdBrowser/ladybird.git synced 2025-01-23 09:46:04 -05:00
Code Issues Projects Releases Packages Wiki Activity

Kernel: Implement capturing stack traces on x86_64

Browse source
This commit is contained in:
Gunnar Beutner 2021-06-29 10:47:31 +02:00 • committed by Andreas Kling
parent 6dde7dac8f
commit 0b82c583e0
Notes: sideshowbarker 2024-07-18 11:20:09 +09:00
1 changed files with 14 additions and 8 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

22
Kernel/Arch/x86/common/Processor.cpp
View file

@ -408,12 +408,12 @@ const DescriptorTablePointer& Processor::get_gdtr()
Vector<FlatPtr> Processor::capture_stack_trace(Thread& thread, size_t max_frames)
{
FlatPtr frame_ptr = 0, eip = 0;
FlatPtr frame_ptr = 0, ip = 0;
Vector<FlatPtr, 32> stack_trace;
auto walk_stack = [&](FlatPtr stack_ptr) {
static constexpr size_t max_stack_frames = 4096;
stack_trace.append(eip);
stack_trace.append(ip);
size_t count = 1;
while (stack_ptr && stack_trace.size() < max_stack_frames) {
FlatPtr retaddr;
@ -440,7 +440,7 @@ Vector<FlatPtr> Processor::capture_stack_trace(Thread& thread, size_t max_frames
};
auto capture_current_thread = [&]() {
frame_ptr = (FlatPtr)__builtin_frame_address(0);
eip = (FlatPtr)__builtin_return_address(0);
ip = (FlatPtr)__builtin_return_address(0);
walk_stack(frame_ptr);
};
@ -496,10 +496,15 @@ Vector<FlatPtr> Processor::capture_stack_trace(Thread& thread, size_t max_frames
// pushed the callee-saved registers, and the last of them happens
// to be ebp.
ProcessPagingScope paging_scope(thread.process());
#if ARCH(I386)
auto& regs = thread.regs();
u32* stack_top;
stack_top = reinterpret_cast<u32*>(regs.esp);
FlatPtr* stack_top;
FlatPtr sp;
#if ARCH(I386)
sp = regs.esp;
#else
sp = regs.rsp;
#endif
stack_top = reinterpret_cast<FlatPtr*>(sp);
if (is_user_range(VirtualAddress(stack_top), sizeof(FlatPtr))) {
if (!copy_from_user(&frame_ptr, &((FlatPtr*)stack_top)[0]))
frame_ptr = 0;
@ -508,9 +513,10 @@ Vector<FlatPtr> Processor::capture_stack_trace(Thread& thread, size_t max_frames
if (!safe_memcpy(&frame_ptr, &((FlatPtr*)stack_top)[0], sizeof(FlatPtr), fault_at))
frame_ptr = 0;
}
eip = regs.eip;
#if ARCH(I386)
ip = regs.eip;
#else
TODO();
ip = regs.rip;
#endif
// TODO: We need to leave the scheduler lock here, but we also
// need to prevent the target thread from being run while