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Diffstat (limited to 'libpthread/linuxthreads/sysdeps/arm/pt-machine.h')
-rw-r--r--libpthread/linuxthreads/sysdeps/arm/pt-machine.h34
1 files changed, 9 insertions, 25 deletions
diff --git a/libpthread/linuxthreads/sysdeps/arm/pt-machine.h b/libpthread/linuxthreads/sysdeps/arm/pt-machine.h
index fc17e9bc7..b00b10495 100644
--- a/libpthread/linuxthreads/sysdeps/arm/pt-machine.h
+++ b/libpthread/linuxthreads/sysdeps/arm/pt-machine.h
@@ -29,35 +29,19 @@
#endif
#if defined(__thumb2__)
-PT_EI long int ldrex(int *spinlock)
-{
- long int ret;
- __asm__ __volatile__(
- "ldrex %0, [%1]\n"
- : "=r"(ret)
- : "r"(spinlock) : "memory");
- return ret;
-}
-
-PT_EI long int strex(int val, int *spinlock)
-{
- long int ret;
- __asm__ __volatile__(
- "strex %0, %1, [%2]\n"
- : "=r"(ret)
- : "r" (val), "r"(spinlock) : "memory");
- return ret;
-}
-
/* Spinlock implementation; required. */
PT_EI long int
testandset (int *spinlock)
{
- register unsigned int ret;
-
- do {
- ret = ldrex(spinlock);
- } while (strex(1, spinlock));
+ unsigned int ret, tmp, val = 1;
+
+ __asm__ __volatile__ (
+"0: ldrex %0, [%2] \n"
+" strex %1, %3, [%2] \n"
+" cmp %1, #0 \n"
+" bne 0b"
+ : "=&r" (ret), "=&r" (tmp)
+ : "r" (spinlock), "r" (val) : "memory", "cc");
return ret;
}