S/390: Add support for STT_GNU_IFUNC symbols.

Add support for STT_GNU_IFUNC symbols and the new R_390_IRELATIVE
relocation.  Provide optimized version of memcpy, memset, and memcmp
for z10 and z196.

1 files changed, 64 insertions, 0 deletions

diff --git a/sysdeps/s390/s390-64/memcmp.S b/sysdeps/s390/s390-64/memcmp.S
new file mode 100644
index 0000000000..e0b62e3a45
--- /dev/null
+++ b/sysdeps/s390/s390-64/memcmp.S
@@ -0,0 +1,64 @@
+/* memcmp - compare two memory blocks.  64 bit S/390 version.
+   Copyright (C) 2012 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <http://www.gnu.org/licenses/>.  */
+
+
+#include "sysdep.h"
+#include "asm-syntax.h"
+
+/* INPUT PARAMETERS
+     %r2 = address of first memory area
+     %r3 = address of second memory area
+     %r4 = number of bytes to compare.  */
+
+       .text
+#ifdef USE_MULTIARCH
+ENTRY(memcmp_z900)
+#else
+ENTRY(memcmp)
+#endif
+	.machine "z900"
+        ltgr    %r4,%r4
+        je      .L_Z900_4
+        aghi    %r4,-1
+        srlg    %r1,%r4,8
+        ltgr    %r1,%r1
+        jne     .L_Z900_12
+.L_Z900_3:
+        larl    %r1,.L_Z900_15
+        ex      %r4,0(%r1)
+.L_Z900_4:
+        ipm     %r2
+        sllg    %r2,%r2,34
+        srag    %r2,%r2,62
+        br      %r14
+.L_Z900_12:
+        clc     0(256,%r3),0(%r2)
+        jne     .L_Z900_4
+        la      %r3,256(%r3)
+        la      %r2,256(%r2)
+        brctg   %r1,.L_Z900_12
+        j       .L_Z900_3
+.L_Z900_15:
+        clc     0(1,%r3),0(%r2)
+#ifdef USE_MULTIARCH
+END(memcmp_z900)
+#else
+END(memcmp)
+libc_hidden_builtin_def (memcmp)
+weak_alias (memcmp, bcmp)
+#endif