summaryrefslogtreecommitdiff
path: root/kernel/printf.c
diff options
context:
space:
mode:
authorMole Shang <[email protected]>2024-02-16 10:20:27 +0800
committerMole Shang <[email protected]>2024-02-16 10:20:27 +0800
commita98c56a811142e5ede3332a7a444cca45f628769 (patch)
treec93ff7090da7b6ef911932be283818c2f6a03784 /kernel/printf.c
parent0d65be5d1d880afafbf08c2adb605cf9f72216e2 (diff)
parent99015f3a985b2fd051606636743a2a2969b216e8 (diff)
downloadxv6-labs-a98c56a811142e5ede3332a7a444cca45f628769.tar.gz
xv6-labs-a98c56a811142e5ede3332a7a444cca45f628769.tar.bz2
xv6-labs-a98c56a811142e5ede3332a7a444cca45f628769.zip
Merge branch 'lock' into thread
Conflicts: .gitignore Makefile conf/lab.mk
Diffstat (limited to 'kernel/printf.c')
-rw-r--r--kernel/printf.c17
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);
+ }
+}