diff --git a/nemu/src/utils/elf-parser.c b/nemu/src/utils/elf-parser.c
index 9fe75d8..0f5c26c 100644
--- a/nemu/src/utils/elf-parser.c
+++ b/nemu/src/utils/elf-parser.c
@@ -17,13 +17,13 @@ static int cmp_func_t(const void *a, const void *b) {
 }
 
 func_t *get_func(vaddr_t addr) {
-  int l = 0, r = func_table_len - 1;
+  int l = 0, r = func_table_len;
   while(l < r) {
     int mid = l + (r - l) / 2;
-    if(func_table[mid].start <= addr)  l = mid ;
-    else r = mid - 1;
+    if(func_table[mid].start <= addr)  l = mid + 1;
+    else r = mid;
   }
-  return &func_table[l-1];
+  return &func_table[r-1];
 }
 
 void init_elf(const char *path) {