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, 102 insertions, 0 deletions

diff --git a/sysdeps/s390/s390-32/multiarch/memcmp.S b/sysdeps/s390/s390-32/multiarch/memcmp.S
new file mode 100644
index 0000000000..cd8ea86b0c
--- /dev/null
+++ b/sysdeps/s390/s390-32/multiarch/memcmp.S
@@ -0,0 +1,102 @@
+/* CPU specific memcmp implementations.  32 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
+
+#ifndef NOT_IN_libc
+
+ENTRY(memcmp_z196)
+	.machine "z196"
+        ltr     %r4,%r4
+        je      .L_Z196_4
+        ahi     %r4,-1
+        srlk    %r1,%r4,8
+        ltr     %r1,%r1
+        jne     .L_Z196_2
+.L_Z196_3:
+        exrl    %r4,.L_Z196_14
+.L_Z196_4:
+        ipm     %r2
+        sll     %r2,2
+        sra     %r2,30
+        br      %r14
+.L_Z196_17:
+        la      %r3,256(%r3)
+        la      %r2,256(%r2)
+        ahi     %r1,-1
+        je      .L_Z196_3
+.L_Z196_2:
+        pfd     1,512(%r3)
+        pfd     1,512(%r2)
+        clc     0(256,%r3),0(%r2)
+        je      .L_Z196_17
+        ipm     %r2
+        sll     %r2,2
+        sra     %r2,30
+        br      %r14
+.L_Z196_14:
+        clc     0(1,%r3),0(%r2)
+END(memcmp_z196)
+
+ENTRY(memcmp_z10)
+	.machine "z10"
+        ltr     %r4,%r4
+        je      .L_Z10_4
+        ahi     %r4,-1
+        lr      %r1,%r4
+        srl     %r1,8
+        cijlh   %r1,0,.L_Z10_12
+.L_Z10_3:
+        exrl    %r4,.L_Z10_15
+.L_Z10_4:
+        ipm     %r2
+        sll     %r2,2
+        sra     %r2,30
+        br      %r14
+.L_Z10_12:
+        pfd     1,512(%r3)
+        pfd     1,512(%r2)
+        clc     0(256,%r3),0(%r2)
+        jne     .L_Z10_4
+        la      %r3,256(%r3)
+        la      %r2,256(%r2)
+        brct    %r1,.L_Z10_12
+        j       .L_Z10_3
+.L_Z10_15:
+        clc     0(1,%r3),0(%r2)
+END(memcmp_z10)
+
+#endif
+
+#include "../memcmp.S"
+
+#ifdef NOT_IN_libc
+.globl   memcmp
+.set     memcmp,memcmp_g5
+.weak    bcmp
+.set	 bcmp,memcmp_g5
+#endif