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| author | Mole Shang <135e2@135e2.dev> | 2024-02-11 14:44:22 +0800 |
|---|---|---|
| committer | Mole Shang <135e2@135e2.dev> | 2024-02-11 16:06:15 +0800 |
| commit | 2fe04bc8faa4bf737a86c36a8017473e84814f3b (patch) | |
| tree | 2146d3dae86f21060e2e807ad364f5a949fd1c53 /kernel/printf.c | |
| parent | 5ce1f630132d8b7b35b9dc46b4a55f860eb85d5c (diff) | |
| parent | 48a5e34fcd07852b4a68825ce8e37feb6f6d04d7 (diff) | |
| download | xv6-labs-2fe04bc8faa4bf737a86c36a8017473e84814f3b.tar.gz xv6-labs-2fe04bc8faa4bf737a86c36a8017473e84814f3b.tar.bz2 xv6-labs-2fe04bc8faa4bf737a86c36a8017473e84814f3b.zip | |
Merge branch 'traps' into cow
Conflicts:
.gitignore
Makefile
conf/lab.mk
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); + } +} |