dynamic: Save original instructions only once

Don't save instructions if they are already present in the code hmap. Signed-off-by: Clément Guidi <[email protected]>
namhyung · Aug 29, 2023 · 68993aa · 68993aa
1 parent ccb8e5a
commit 68993aa
Showing 1 changed file with 3 additions and 0 deletions.
diff --git a/libmcount/dynamic.c b/libmcount/dynamic.c
@@ -105,6 +105,9 @@ void mcount_save_code(struct mcount_disasm_info *info, unsigned call_size, void
 	struct mcount_orig_insn *orig;
 	int patch_size;
 
+	if (hashmap_get(code_hmap, (void *)info->addr + call_size))
+		return;
+
 	if (unlikely(info->modified)) {
 		/* it needs to save original instructions as well */
 		int orig_size = ALIGN(info->orig_size, 16);