diff options
Diffstat (limited to 'kernel/printf.c')
-rw-r--r-- | kernel/printf.c | 17 |
1 files changed, 17 insertions, 0 deletions
diff --git a/kernel/printf.c b/kernel/printf.c index 1a50203..509c1c5 100644 --- a/kernel/printf.c +++ b/kernel/printf.c @@ -122,6 +122,8 @@ panic(char *s) printf("panic: "); printf(s); printf("\n"); + backtrace(); + panicked = 1; // freeze uart output from other CPUs for(;;) ; @@ -133,3 +135,18 @@ printfinit(void) initlock(&pr.lock, "pr"); pr.locking = 1; } + +void +backtrace(void) +{ + uint64 fp = r_fp(); + printf("backtrace:\n"); + uint64 stackpg = PGROUNDDOWN(fp); + // Whereever fp points to should always live in the stack page + while(PGROUNDDOWN(fp) == stackpg){ + // print the return addr (stored in fp-8) + printf("%p\n", *(uint64 *)(fp-8)); + // load previous (upper stack) fp + fp = *(uint64 *)(fp-16); + } +} |