Initial version of single-cpu xv6 with page tables

1 files changed, 1 insertions, 1 deletions

diff --git a/spinlock.c b/spinlock.c
index c3ea730..54e4eb5 100644
--- a/spinlock.c
+++ b/spinlock.c
@@ -71,7 +71,7 @@ getcallerpcs(void *v, uint pcs[])
   
   ebp = (uint*)v - 2;
   for(i = 0; i < 10; i++){
-    if(ebp == 0 || ebp == (uint*)0xffffffff)
+    if(ebp == 0 || ebp < 0x100000 || ebp == (uint*)0xffffffff)
       break;
     pcs[i] = ebp[1];     // saved %eip
     ebp = (uint*)ebp[0]; // saved %ebp