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| author | Mole Shang <[email protected]> | 2024-02-19 14:10:32 +0800 |
|---|---|---|
| committer | Mole Shang <[email protected]> | 2024-02-19 14:36:21 +0800 |
| commit | d86118fc80267649b4791c8c0c72ebd60edf1ef2 (patch) | |
| tree | b792b617b4df80a5803a9c1164d0e3fdfe9cfe31 /kernel/printf.c | |
| parent | b20ef9d0210fd7d9403acde1857eed1b9880c0b2 (diff) | |
| parent | 0cf897cbe05fd8485162619db4244f4159d0eb52 (diff) | |
| download | xv6-labs-d86118fc80267649b4791c8c0c72ebd60edf1ef2.tar.gz xv6-labs-d86118fc80267649b4791c8c0c72ebd60edf1ef2.tar.bz2 xv6-labs-d86118fc80267649b4791c8c0c72ebd60edf1ef2.zip | |
Merge branch 'fs' into mmap
Conflicts:
.gitignore
Makefile
conf/lab.mk
kernel/defs.h
user/user.h
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); + } +} |