arch/x86_64/panic/panic.c


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#include "panic/panic.h"
#include "arch/x86_64/hal/idt.h"
#include "arch/x86_64/x86_64.h"
#include "arch/x86_64/hal/paging.h"
#include "lib/printf.h"

__attribute__((naked))
void*
__panic_get_bp(void)
{
    asm("movq %%rbp, %%rax; \
         retq"::: "memory");
}

void*
__panic_print_istate(void *state)
{
    struct int_stackframe *int_state = state;
    kprintf("RIP: %p | RSP: %p\n", int_state->int_rip, int_state->int_rsp);

    print_state(&int_state->state);
    return (void*)int_state->state.rbp;
}

void 
__panic_stack_trace(void *bp)
{
    uintmax_t *rbp = (uintmax_t*)bp;
    kprintf("\nStack trace:\n");

    while(rbp) {
        kprintf("%p:\n", rbp[1]);
        uintmax_t *next = (uintmax_t*)rbp[0];
        ptrdiff_t dist = (next - rbp);

        if((uintptr_t)next < IDENT_VIRT_BASE) break;
        if(dist > 0) {
            for(size_t i = 0; i < dist; i++) {
                kprintf("    %p\n", rbp[i]);
            }
        }

        rbp = next;
    }
}