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mark arm thread-pointer-loading inline asm as volatile

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this builds on commits a603a75a72 and
0ba35d69c0 to ensure that a compiler
cannot conclude that it's valid to reorder the asm to a point before
the thread pointer is set up, or to treat the inline function as if it
were declared with attribute((const)).

other archs already use volatile asm for thread pointer loading.
This commit is contained in:
Rich Felker 2015-10-15 12:04:48 -04:00
parent 11da520c7a
commit 74483c5955
1 changed files with 3 additions and 3 deletions
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6
arch/arm/pthread_arch.h
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@ -4,7 +4,7 @@
static inline pthread_t __pthread_self()
{
char *p;
__asm__( "mrc p15,0,%0,c13,c0,3" : "=r"(p) );
__asm__ __volatile__ ( "mrc p15,0,%0,c13,c0,3" : "=r"(p) );
return (void *)(p+8-sizeof(struct pthread));
}
@ -14,10 +14,10 @@ static inline pthread_t __pthread_self()
{
#ifdef __clang__
char *p;
__asm__( "bl __a_gettp\n\tmov %0,r0" : "=r"(p) : : "cc", "r0", "lr" );
__asm__ __volatile__ ( "bl __a_gettp\n\tmov %0,r0" : "=r"(p) : : "cc", "r0", "lr" );
#else
register char *p __asm__("r0");
__asm__( "bl __a_gettp" : "=r"(p) : : "cc", "lr" );
__asm__ __volatile__ ( "bl __a_gettp" : "=r"(p) : : "cc", "lr" );
#endif
return (void *)(p+8-sizeof(struct pthread));
}