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55 lines
1.3 KiB
C
55 lines
1.3 KiB
C
/* Copyright (C) 2021,2022 fef <owo@fef.moe>. All rights reserved. */
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#include <gay/kprintf.h>
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#include <gay/ktrace.h>
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#include <gay/linker.h>
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/*
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* i386 stack frame layout:
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*
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* 12(%ebp) ...
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* 8(%ebp) argument 1 (if applicable)
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* 4(%ebp) caller %eip (after the call instruction, pushed by hardware)
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* ------------------------------------------------------------
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* (%ebp) caller %ebp (pushed in callee prologue)
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* -4(%ebp) local variable 1
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* -8(%ebp) local variable 2
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* -12(%ebp) ...
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*/
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__naked void ktrace_print(void)
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{
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__asm__ volatile(
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" pushl %ebp \n"
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" call ktrace_print_from \n"
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" ret \n"
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);
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}
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void ktrace_print_from(void *frame)
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{
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void **ebp = (void **)frame;
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kprintf("Stack trace:\n");
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/* XXX Rather than spitting out raw addresses, parse the kernel image's
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* ELF sections to figure out what the address actually belongs to */
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while (ebp >= (void **)image_start && ebp < (void **)image_end) {
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/* arch/x86/boot/setup32.S pushes two `nil's as the initial stack frame */
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if (ebp[1] == nil)
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break;
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/* caller return address is immediately above the stack frame */
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kprintf(" %p\n", ebp[1]);
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if (ebp[1] >= isr_start && ebp[1] < isr_end)
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break;
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ebp = *ebp;
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}
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}
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__naked void *ktrace_return_addr(void)
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{
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__asm__ volatile(
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" movl 4(%ebp), %eax \n"
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" ret \n"
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);
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}
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