diff options
Diffstat (limited to 'linuxthreads/sysdeps/powerpc/powerpc64/pt-machine.h')
| -rw-r--r-- | linuxthreads/sysdeps/powerpc/powerpc64/pt-machine.h | 44 |
1 files changed, 44 insertions, 0 deletions
diff --git a/linuxthreads/sysdeps/powerpc/powerpc64/pt-machine.h b/linuxthreads/sysdeps/powerpc/powerpc64/pt-machine.h index ac3149581b..562e69fa18 100644 --- a/linuxthreads/sysdeps/powerpc/powerpc64/pt-machine.h +++ b/linuxthreads/sysdeps/powerpc/powerpc64/pt-machine.h @@ -30,6 +30,7 @@ extern long int testandset (int *spinlock); extern int __compare_and_swap (long int *p, long int oldval, long int newval); +extern int __compare_and_swap32 (int *p, int oldval, int newval); /* For multiprocessor systems, we want to ensure all memory accesses are completed before we reset a lock. On other systems, we still @@ -118,6 +119,49 @@ __compare_and_swap_with_release_semantics (long int *p, return (int)(ret == 0); } +PT_EI int +__compare_and_swap32 (int *p, int oldval, int newval) +{ + int ret; + + __asm__ __volatile__ ( + "0: lwarx %0,0,%1 ;" + " xor. %0,%3,%0;" + " bne 1f;" + " stwcx. %2,0,%1;" + " bne- 0b;" + "1: " + : "=&r"(ret) + : "r"(p), "r"(newval), "r"(oldval) + : "cr0", "memory"); + /* This version of __compare_and_swap is to be used when acquiring + a lock, so we don't need to worry about whether other memory + operations have completed, but we do need to be sure that any loads + after this point really occur after we have acquired the lock. */ + __asm__ __volatile__ ("isync" : : : "memory"); + return (int)(ret == 0); +} + +PT_EI int +__compare_and_swap32_with_release_semantics (long int *p, + long int oldval, long int newval) +{ + long int ret; + + MEMORY_BARRIER (); + __asm__ __volatile__ ( + "0: lwarx %0,0,%1 ;" + " xor. %0,%3,%0;" + " bne 1f;" + " stwcx. %2,0,%1;" + " bne- 0b;" + "1: " + : "=&r"(ret) + : "r"(p), "r"(newval), "r"(oldval) + : "cr0", "memory"); + return (int)(ret == 0); +} + PT_EI long int testandset (int *p) { |