S390: Refactor ifunc implementations and enable ifunc-test-framework.

On s390 all ifunc resolvers were implemented in multiarch/ifunc-resolve.c.
The resulting single object files has undefined references to all ifunc-functions.
This patch introduces one multiarch/<func>.c file for each of memcpy, memcmp
and memset with the function specific ifunc resolver. The different function
implementations are now implemented in multiarch/<func>-s390x.S
(moved from multiarch/<func>.S).

The new multiarch/ifunc-resolve.h file contains the ifunc-resolver macro
and other helper-macros. They are merged and are now used in common for
32/64bit. Therefore the __<func>_g5/__<func>_z900 functions were renamed to
__<func>_default.

This patch also enables testing the ifunc implementations by implementing
the function __libc_ifunc_impl_list. It uses the helper-macros of ifunc-resolve.h.

ChangeLog:

	* sysdeps/s390/s390-32/multiarch/Makefile (sysdep_routines):
	Remove ifunc-resolve, add memset-s390, memcpy-s390, memcmp-s390.
	* sysdeps/s390/s390-32/multiarch/ifunc-resolve.c: Delete File.
	* sysdeps/s390/s390-32/multiarch/memcmp.S: Move to ...
	* sysdeps/s390/s390-32/multiarch/memcmp-s390.S: ... here.
	(memcmp, bcmp): Use __memcmp_default as alias source.
	* sysdeps/s390/s390-32/multiarch/memcmp.c: New File.
	* sysdeps/s390/s390-32/memcmp.S (__memcmp_g5):
	Rename to __memcmp_default.
	* sysdeps/s390/s390-32/multiarch/memcpy.S: Move to ...
	* sysdeps/s390/s390-32/multiarch/memcpy-s390.S: ... here.
	(memcpy): Use __memcpy_default as alias source.
	* sysdeps/s390/s390-32/multiarch/memcpy.c: New File.
	* sysdeps/s390/s390-32/memcpy.S (__memcpy_g5):
	Rename to __memcpy_default.
	* sysdeps/s390/s390-32/multiarch/memset.S: Move to ...
	* sysdeps/s390/s390-32/multiarch/memset-s390.S: ... here.
	(memset): Use __memset_default as alias source.
	* sysdeps/s390/s390-32/multiarch/memset.c: New File.
	* sysdeps/s390/s390-32/memset.S (__memset_g5):
	Rename to __memset_default.
	* sysdeps/s390/s390-64/multiarch/Makefile (sysdep_routines):
	Remove ifunc-resolve, add memset-s390x, memcpy-s390x, memcmp-s390x.
	* sysdeps/s390/s390-64/multiarch/ifunc-resolve.c: Delete File.
	* sysdeps/s390/s390-64/multiarch/memcmp.S: Move to ...
	* sysdeps/s390/s390-64/multiarch/memcmp-s390x.S: ... here.
	(memcmp, bcmp): Use __memcmp_default as alias source.
	* sysdeps/s390/s390-64/multiarch/memcmp.c: New File.
	* sysdeps/s390/s390-64/memcmp.S (__memcmp_z900):
	Rename to __memcmp_default.
	* sysdeps/s390/s390-64/multiarch/memcpy.S: Move to ...
	* sysdeps/s390/s390-64/multiarch/memcpy-s390x.S: ... here.
	(memcpy): Use __memcpy_default as alias source.
	* sysdeps/s390/s390-64/multiarch/memcpy.c: New File.
	* sysdeps/s390/s390-64/memcpy.S (__memcpy_z900):
	Rename to __memcpy_default.
	* sysdeps/s390/s390-64/multiarch/memset.S: Move to ...
	* sysdeps/s390/s390-64/multiarch/memset-s390x.S: ... here.
	(memset): Use __memset_default as alias source.
	* sysdeps/s390/s390-64/multiarch/memset.c: New File.
	* sysdeps/s390/s390-64/memset.S (__memset_z900):
	Rename to __memset_default.
	* sysdeps/s390/multiarch/ifunc-resolve.h: New File.
	* sysdeps/s390/multiarch/ifunc-impl-list.c: New File.

1 files changed, 75 insertions, 0 deletions

diff --git a/sysdeps/s390/multiarch/ifunc-resolve.h b/sysdeps/s390/multiarch/ifunc-resolve.h
new file mode 100644
index 0000000000..491df68a61
--- /dev/null
+++ b/sysdeps/s390/multiarch/ifunc-resolve.h
@@ -0,0 +1,75 @@
+/* IFUNC resolver function for CPU specific functions.
+   32/64 bit S/390 version.
+   Copyright (C) 2015 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 S390_STFLE_BITS_Z10  34 /* General instructions extension */
+#define S390_STFLE_BITS_Z196 45 /* Distinct operands, pop ... */
+
+#define S390_IS_Z196(STFLE_BITS)			\
+  ((STFLE_BITS & (1ULL << (63 - S390_STFLE_BITS_Z196))) != 0)
+
+#define S390_IS_Z10(STFLE_BITS)				\
+  ((STFLE_BITS & (1ULL << (63 - S390_STFLE_BITS_Z10))) != 0)
+
+#define S390_STORE_STFLE(STFLE_BITS)					\
+  /* We want just 1 double word to be returned.  */			\
+  register unsigned long reg0 asm("0") = 0;				\
+									\
+  asm volatile(".machine push"        "\n\t"				\
+	       ".machine \"z9-109\""  "\n\t"				\
+	       ".machinemode \"zarch_nohighgprs\"\n\t"			\
+	       "stfle %0"             "\n\t"				\
+	       ".machine pop"         "\n"				\
+	       : "=QS" (STFLE_BITS), "+d" (reg0)			\
+	       : : "cc");
+
+#define s390_libc_ifunc(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");				\
+									\
+  /* Make the declarations of the optimized functions hidden in order
+     to prevent GOT slots being generated for them. */			\
+  extern void *__##FUNC##_z196 attribute_hidden;			\
+  extern void *__##FUNC##_z10 attribute_hidden;				\
+  extern void *__##FUNC##_default attribute_hidden;			\
+									\
+  void *__resolve_##FUNC (unsigned long int dl_hwcap)			\
+  {									\
+    if ((dl_hwcap & HWCAP_S390_STFLE)					\
+	&& (dl_hwcap & HWCAP_S390_ZARCH)				\
+	&& (dl_hwcap & HWCAP_S390_HIGH_GPRS))				\
+      {									\
+	unsigned long long stfle_bits;					\
+	S390_STORE_STFLE (stfle_bits);					\
+									\
+	if (S390_IS_Z196 (stfle_bits))					\
+	  return &__##FUNC##_z196;					\
+	else if (S390_IS_Z10 (stfle_bits))				\
+	  return &__##FUNC##_z10;					\
+	else								\
+	  return &__##FUNC##_default;					\
+      }									\
+    else								\
+      return &__##FUNC##_default;					\
+  }