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-rw-r--r--sysdeps/s390/s390-64/multiarch/ifunc-resolve.c74
1 files changed, 74 insertions, 0 deletions
diff --git a/sysdeps/s390/s390-64/multiarch/ifunc-resolve.c b/sysdeps/s390/s390-64/multiarch/ifunc-resolve.c
new file mode 100644
index 0000000000..f980bc9390
--- /dev/null
+++ b/sysdeps/s390/s390-64/multiarch/ifunc-resolve.c
@@ -0,0 +1,74 @@
+/* IFUNC resolver function for CPU specific functions.
+ 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 <unistd.h>
+#include <dl-procinfo.h>
+
+#define STFLE_BITS_Z10 34 /* General instructions extension */
+#define STFLE_BITS_Z196 45 /* Distinct operands, pop ... */
+
+#ifndef NOT_IN_libc
+
+#define IFUNC_RESOLVE(FUNC) \
+ asm (".globl " #FUNC "\n\t" \
+ ".type " #FUNC ",@gnu_indirect_function\n\t" \
+ ".set " #FUNC ",resolve_" #FUNC "\n\t" \
+ ".globl __GI_" #FUNC "\n\t" \
+ ".set __GI_" #FUNC "," #FUNC "\n"); \
+ \
+ extern void *FUNC##_z10; \
+ extern void *FUNC##_z196; \
+ extern void *FUNC##_z900; \
+ \
+ void *resolve_##FUNC (unsigned long int dl_hwcap) \
+ { \
+ if (dl_hwcap & HWCAP_S390_STFLE) \
+ { \
+ /* We want just 1 double word to be returned. */ \
+ register unsigned long reg0 asm("0") = 0; \
+ unsigned long stfle_bits; \
+ \
+ asm volatile(".machine push" "\n\t" \
+ ".machine \"z9-109\"" "\n\t" \
+ "stfle %0" "\n\t" \
+ ".machine pop" "\n" \
+ : "=QS" (stfle_bits), "+d" (reg0) \
+ : : "cc"); \
+ \
+ if ((stfle_bits & (1UL << (63 - STFLE_BITS_Z196))) != 0) \
+ return &FUNC##_z196; \
+ else if ((stfle_bits & (1UL << (63 - STFLE_BITS_Z10))) != 0) \
+ return &FUNC##_z10; \
+ else \
+ return &FUNC##_z900; \
+ } \
+ else \
+ return &FUNC##_z900; \
+ }
+
+IFUNC_RESOLVE(memset)
+IFUNC_RESOLVE(memcmp)
+asm(".weak bcmp ; bcmp = memcmp");
+
+/* In the static lib memcpy is needed before the reloc is resolved. */
+#ifdef SHARED
+IFUNC_RESOLVE(memcpy)
+#endif
+
+#endif