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-rw-r--r--libc/misc/internals/__uClibc_main.c15
1 files changed, 13 insertions, 2 deletions
diff --git a/libc/misc/internals/__uClibc_main.c b/libc/misc/internals/__uClibc_main.c
index f9e12446b..4ee44439f 100644
--- a/libc/misc/internals/__uClibc_main.c
+++ b/libc/misc/internals/__uClibc_main.c
@@ -105,6 +105,17 @@ _pthread_cleanup_pop_restore(struct _pthread_cleanup_buffer *__buffer,
#endif /* !SHARED */
+/* Defeat compiler optimization which assumes function addresses are never NULL */
+static __always_inline int not_null_ptr(const void *p)
+{
+ const void *q;
+ asm (""
+ : "=r" (q) /* output */
+ : "0" (p) /* input */
+ );
+ return q != 0;
+}
+
/*
* Prototypes.
*/
@@ -254,7 +265,7 @@ void __uClibc_init(void)
#ifdef __UCLIBC_HAS_LOCALE__
/* Initialize the global locale structure. */
- if (likely(_locale_init!=NULL))
+ if (likely(not_null_ptr(_locale_init)))
_locale_init();
#endif
@@ -264,7 +275,7 @@ void __uClibc_init(void)
* Thus we get a nice size savings because the stdio functions
* won't be pulled into the final static binary unless used.
*/
- if (likely(_stdio_init != NULL))
+ if (likely(not_null_ptr(_stdio_init)))
_stdio_init();
}