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authorJoseph Myers <joseph@codesourcery.com>2015-01-28 18:40:35 +0000
committerJoseph Myers <joseph@codesourcery.com>2015-01-28 18:40:35 +0000
commitdf34134284b46cdd8ffd39551b858652d465ca08 (patch)
tree91e7bd10f7499210ccc911381ed82558b4e2dfe8
parentd4d0ecb24474928b9dfcce6c3f09694fab2400b6 (diff)
Disable 64-bit atomics for MIPS n32.
This patch disables use of 64-bit atomics for MIPS n32 to fix the problems with unaligned semaphores. Before 64-bit atomics are used for anything for which such alignment issues do not arise, and before the addition of any new ILP32 ports with 64-bit semaphores for which the ABI can be set to have the greater alignment (AARCH64?), a better approach will need to be established that allows architectures to declare their 64-bit atomics availability accurately, without doing so causing inappropriate use of such atomics on unaligned semaphores. Tested for MIPS n32 that this fixes the nptl/tst-sem3 failure. * sysdeps/mips/bits/atomic.h [_MIPS_SIM == _ABIN32] (__HAVE_64B_ATOMICS): Define to 0.
-rw-r--r--ChangeLog5
-rw-r--r--sysdeps/mips/bits/atomic.h2
2 files changed, 6 insertions, 1 deletions
diff --git a/ChangeLog b/ChangeLog
index 52f8c11867..1a7d519039 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+2015-01-28 Joseph Myers <joseph@codesourcery.com>
+
+ * sysdeps/mips/bits/atomic.h [_MIPS_SIM == _ABIN32]
+ (__HAVE_64B_ATOMICS): Define to 0.
+
2015-01-28 Adhemerval Zanellla <azanella@linux.vnet.ibm.com>
[BZ #17885]
diff --git a/sysdeps/mips/bits/atomic.h b/sysdeps/mips/bits/atomic.h
index ddcb0391a6..a39188160b 100644
--- a/sysdeps/mips/bits/atomic.h
+++ b/sysdeps/mips/bits/atomic.h
@@ -44,7 +44,7 @@ typedef uintmax_t uatomic_max_t;
#define MIPS_PUSH_MIPS2
#endif
-#if _MIPS_SIM == _ABIO32
+#if _MIPS_SIM == _ABIO32 || _MIPS_SIM == _ABIN32
#define __HAVE_64B_ATOMICS 0
#else
#define __HAVE_64B_ATOMICS 1