diff options
| -rw-r--r-- | libc/misc/internals/__uClibc_main.c | 15 |
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(); } |