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panic: print backtrace on panic

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Panics currently lack backtraces, which are a very useful thing to
have. Make the profiling backtrace function generic and print backtraces
using it.
This commit is contained in:
Matheus
2026-10-08 22:14:46 -03:00
parent 9b8c81a2cf
commit 91ec85d8ca
4 changed files with 99 additions and 24 deletions
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kernel-src/lib/panic.c
+23
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@@ -3,6 +3,18 @@
#include <arch/smp.h>
#include <printf.h>
#include <kernel/interrupt.h>
#include <arch/backtrace.h>
static bool paniced = false;
static bool step_backtrace(void *, void *ip) {
printf("%p\n", ip);
return true;
}
static void print_backtrace(context_t *context, void *) {
arch_get_backtrace(context, step_backtrace, NULL);
}
__attribute__((noreturn)) void _panic(char *msg, context_t *ctx) {
interrupt_set(false);
@@ -17,5 +29,16 @@ __attribute__((noreturn)) void _panic(char *msg, context_t *ctx) {
if (ctx)
PRINT_CTX(ctx);
if (!paniced) {
paniced = true;
printf("backtrace:\n");
if (ctx == NULL)
arch_context_saveandcall(print_backtrace, NULL, NULL);
else
print_backtrace(ctx, NULL);
} else {
printf("!! DOUBLE PANIC !!\n");
}
for (;;);
}