diff options
author | Mole Shang <[email protected]> | 2024-02-13 19:39:56 +0800 |
---|---|---|
committer | Mole Shang <[email protected]> | 2024-02-13 19:39:56 +0800 |
commit | 89ef6f717ed4b3e702e5f6f906f58fe1ea27d366 (patch) | |
tree | 760cce316675479a6cca77551438e8d2cc5fe9ae /kernel/printf.c | |
parent | cfae93475dfb4cb5cfe264f4c029136e1447c262 (diff) | |
parent | 4a6593f1a6f666c618d303a4858c4c6d31b41c63 (diff) | |
download | xv6-labs-89ef6f717ed4b3e702e5f6f906f58fe1ea27d366.tar.gz xv6-labs-89ef6f717ed4b3e702e5f6f906f58fe1ea27d366.tar.bz2 xv6-labs-89ef6f717ed4b3e702e5f6f906f58fe1ea27d366.zip |
Merge branch 'cow' into net
Conflicts:
.gitignore
Makefile
conf/lab.mk
kernel/defs.h
kernel/syscall.c
kernel/vm.c
user/pingpong.c
user/user.h
user/usys.pl
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); + } +} |