diff options
| author | Danny Holman <dholman@gymli.org> | 2024-06-24 02:07:27 -0500 |
|---|---|---|
| committer | Danny Holman <dholman@gymli.org> | 2024-06-24 02:07:27 -0500 |
| commit | b09100f8b79b77f613f5d68fd661e3cbaf1f5c86 (patch) | |
| tree | 25c053e2b2a39e9ca356d57428bb5b045d7d42a9 /arch | |
| parent | 5e376ab1287be429c021907fa719ce42173b1df2 (diff) | |
arch: i386: add a function that walks the stack
Add a function that will walk the stack and save the return addresses
into an array. This will allow the kernel to print out stack traces
during a panic or on demand inside a debugger.
Signed-off-by: Danny Holman <dholman@gymli.org>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/i386/kernel/stack_trace.s | 31 | ||||
| -rw-r--r-- | arch/i386/make.config | 1 |
2 files changed, 32 insertions, 0 deletions
diff --git a/arch/i386/kernel/stack_trace.s b/arch/i386/kernel/stack_trace.s new file mode 100644 index 0000000..fbd77ed --- /dev/null +++ b/arch/i386/kernel/stack_trace.s @@ -0,0 +1,31 @@ +.section .text + +.global walk_stack +.type walk_stack, @function +walk_stack: + pushl %ebp + movl %esp, %ebp + + pushl %edi + movl -4(%ebp), %edi + pushl %ebx + movl -8(%ebp), %ebx + + xorl %eax, %eax + movl 8(%esp), %ebx + movl 16(%esp), %edi + movl 20(%esp), %ecx +walk: + testl %ebx, %ebx + jz done + movl 4(%ebx), %edx + movl 0(%ebx), %ebx + movl %edx, (%edi) + addl $4, %edi + inc %eax + loop walk +done: + popl %ebx + popl %edi + popl %ebp + ret diff --git a/arch/i386/make.config b/arch/i386/make.config index 82d0733..557f01a 100644 --- a/arch/i386/make.config +++ b/arch/i386/make.config @@ -7,6 +7,7 @@ KERNEL_ARCH_OBJS=$(ARCHDIR)/boot/boot.o \ $(ARCHDIR)/kernel/idt.o \ $(ARCHDIR)/kernel/gdt.o \ $(ARCHDIR)/kernel/isr.o \ + $(ARCHDIR)/kernel/stack_trace.o \ $(ARCHDIR)/kernel/multiboot.o \ $(ARCHDIR)/kernel/serial.o \ $(ARCHDIR)/kernel/pic.o \ |