diff options
Diffstat (limited to 'nptl/sysdeps/x86_64')
| -rw-r--r-- | nptl/sysdeps/x86_64/tls.h | 12 |
1 files changed, 10 insertions, 2 deletions
diff --git a/nptl/sysdeps/x86_64/tls.h b/nptl/sysdeps/x86_64/tls.h index 975d20f3fa..ab13f25431 100644 --- a/nptl/sysdeps/x86_64/tls.h +++ b/nptl/sysdeps/x86_64/tls.h @@ -67,6 +67,14 @@ typedef struct /* Get the thread descriptor definition. */ # include <nptl/descr.h> +#ifndef LOCK_PREFIX +# ifdef UP +# define LOCK_PREFIX /* nothing */ +# else +# define LOCK_PREFIX "lock;" +# endif +#endif + /* This is the size of the initial TCB. */ # define TLS_INIT_TCB_SIZE sizeof (tcbhead_t) @@ -267,7 +275,7 @@ typedef struct ({ __typeof (descr->member) __ret; \ __typeof (oldval) __old = (oldval); \ if (sizeof (descr->member) == 4) \ - asm volatile (LOCK "cmpxchgl %2, %%fs:%P3" \ + asm volatile (LOCK_PREFIX "cmpxchgl %2, %%fs:%P3" \ : "=a" (__ret) \ : "0" (__old), "r" (newval), \ "i" (offsetof (struct pthread, member))); \ @@ -280,7 +288,7 @@ typedef struct /* Atomic set bit. */ #define THREAD_ATOMIC_BIT_SET(descr, member, bit) \ (void) ({ if (sizeof ((descr)->member) == 4) \ - asm volatile (LOCK "orl %1, %%fs:%P0" \ + asm volatile (LOCK_PREFIX "orl %1, %%fs:%P0" \ :: "i" (offsetof (struct pthread, member)), \ "ir" (1 << (bit))); \ else \ |