powerpc: Fix missing barriers in atomic_exchange_and_add_{acq,rel}

On powerpc, atomic_exchange_and_add is implemented without any
barriers.  This patchs adds the missing instruction and memory barrier
for acquire and release semanthics.

1 files changed, 6 insertions, 0 deletions

diff --git a/sysdeps/powerpc/powerpc32/bits/atomic.h b/sysdeps/powerpc/powerpc32/bits/atomic.h
index 117b5a0775..e2a1bf46c7 100644
--- a/sysdeps/powerpc/powerpc32/bits/atomic.h
+++ b/sysdeps/powerpc/powerpc32/bits/atomic.h
@@ -98,6 +98,12 @@
 #define __arch_atomic_exchange_and_add_64(mem, value) \
     ({ abort (); (*mem) = (value); })
 
+#define __arch_atomic_exchange_and_add_64_acq(mem, value) \
+    ({ abort (); (*mem) = (value); })
+
+#define __arch_atomic_exchange_and_add_64_rel(mem, value) \
+    ({ abort (); (*mem) = (value); })
+
 #define __arch_atomic_increment_val_64(mem) \
     ({ abort (); (*mem)++; })