S390: Move utf8-utf32-z9.c to multiarch folder and use s390_libc_ifunc_expr macro.

The utf8-utf32-z9.c iconv module is using ifunc and thus the ifunc part should
be in multiarch folder.  Otherwise ifunc is used even if you configure
with --disable-multi-arch.

This patch moves the ifunc resolvers to the new file
sysdeps/s390/multiarch/utf8-utf32-z9.c. The resolvers are now implemented
with s390_libc_ifunc_expr macro instead of using gcc attribute ifunc directly.

The ifunc versions are implemented in sysdeps/s390/utf8-utf32-z9.c.
Each version is only implemented if needed or supported.  Therefore there is
a block at beginning of the file which selects the versions which should be
defined depending on support for multiarch, vector-support and used minimum
architecture level.  This block defines HAVE_[FROM|TO]_[C|CU|VX] to 1 or 0.
The code below is rearranged and surrounded
by #if HAVE_[FROM|TO]_[C|CU|VX] == 1.  There is no functional change.

The cu instructions are z9 zarch instructions.  As the major distros are
already using the newer z196 as architecture level set, those instructions
can be used as fallback version instead of the c-code.  This behaviour is
decided at compile time via HAVE_S390_MIN_Z196_ZARCH_ASM_SUPPORT.

ChangeLog:

	* sysdeps/s390/multiarch/utf8-utf32-z9.c: New File.
	* sysdeps/s390/utf8-utf32-z9.c: Move ifunc resolvers to multiarch
	folder and define ifunc versions depending on HAVE_[FROM|TO]_[C|CU|VX].
	(HAVE_FROM_C, HAVE_FROM_CU, HAVE_FROM_VX, HAVE_TO_C, HAVE_TO_VX,
	FROM_LOOP_DEFAULT, FROM_LOOP_C, FROM_LOOP_CU, FROM_LOOP_VX,
	TO_LOOP_DEFAULT, TO_LOOP_C, TO_LOOP_VX): New Define.

2 files changed, 160 insertions, 103 deletions

diff --git a/sysdeps/s390/multiarch/utf8-utf32-z9.c b/sysdeps/s390/multiarch/utf8-utf32-z9.c
new file mode 100644
index 0000000000..faf1f46aa9
--- /dev/null
+++ b/sysdeps/s390/multiarch/utf8-utf32-z9.c
@@ -0,0 +1,48 @@
+/* Conversion between UTF-8 and UTF-32 - multiarch s390 version.
+
+   Copyright (C) 2017 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 <sysdeps/s390/utf8-utf32-z9.c>
+#include <ifunc-resolve.h>
+
+#undef FROM_LOOP
+#define FROM_LOOP	__from_utf8_loop
+#undef TO_LOOP
+#define TO_LOOP		__to_utf8_loop
+
+#define _SINGLE_NAME(NAME) NAME##_single
+#define SINGLE_NAME(NAME) _SINGLE_NAME(NAME)
+strong_alias (SINGLE_NAME (FROM_LOOP_DEFAULT), SINGLE_NAME (FROM_LOOP))
+strong_alias (SINGLE_NAME (TO_LOOP_DEFAULT), SINGLE_NAME (TO_LOOP))
+
+/* Generate ifunc'ed loop functions for FROM/TO_LOOP.  */
+s390_libc_ifunc_expr (FROM_LOOP_DEFAULT, FROM_LOOP,
+		      (HAVE_FROM_VX && (hwcap & HWCAP_S390_VX))
+		      ? FROM_LOOP_VX
+		      : (HAVE_FROM_CU && (hwcap & HWCAP_S390_ZARCH
+					  && hwcap & HWCAP_S390_HIGH_GPRS
+					  && hwcap & HWCAP_S390_ETF3EH))
+			? FROM_LOOP_CU
+			: FROM_LOOP_DEFAULT);
+
+s390_libc_ifunc_expr (TO_LOOP_DEFAULT, TO_LOOP,
+		      (HAVE_TO_VX && (hwcap & HWCAP_S390_VX))
+		      ? TO_LOOP_VX
+		      : TO_LOOP_DEFAULT);
+
+#include <iconv/skeleton.c>
diff --git a/sysdeps/s390/utf8-utf32-z9.c b/sysdeps/s390/utf8-utf32-z9.c
index 6d8be42607..57572fa44a 100644
--- a/sysdeps/s390/utf8-utf32-z9.c
+++ b/sysdeps/s390/utf8-utf32-z9.c
@@ -27,8 +27,35 @@
 #include <dlfcn.h>
 #include <stdint.h>
 #include <unistd.h>
-#include <dl-procinfo.h>
 #include <gconv.h>
+#include <string.h>
+
+/* Select which versions should be defined depending on support
+   for multiarch, vector and used minimum architecture level.  */
+#ifdef HAVE_S390_MIN_Z196_ZARCH_ASM_SUPPORT
+# define HAVE_FROM_C		0
+# define FROM_LOOP_DEFAULT	FROM_LOOP_CU
+#else
+# define HAVE_FROM_C		1
+# define FROM_LOOP_DEFAULT	FROM_LOOP_C
+#endif
+
+#define HAVE_TO_C		1
+#define TO_LOOP_DEFAULT		TO_LOOP_C
+
+#if defined HAVE_S390_MIN_Z196_ZARCH_ASM_SUPPORT || defined USE_MULTIARCH
+# define HAVE_FROM_CU		1
+#else
+# define HAVE_FROM_CU		0
+#endif
+
+#if defined HAVE_S390_VX_ASM_SUPPORT && defined USE_MULTIARCH
+# define HAVE_FROM_VX		1
+# define HAVE_TO_VX		1
+#else
+# define HAVE_FROM_VX		0
+# define HAVE_TO_VX		0
+#endif
 
 #if defined HAVE_S390_VX_GCC_SUPPORT
 # define ASM_CLOBBER_VR(NR) , NR
@@ -48,8 +75,8 @@
 #define MIN_NEEDED_FROM		1
 #define MAX_NEEDED_FROM		6
 #define MIN_NEEDED_TO		4
-#define FROM_LOOP		__from_utf8_loop
-#define TO_LOOP			__to_utf8_loop
+#define FROM_LOOP		FROM_LOOP_DEFAULT
+#define TO_LOOP			TO_LOOP_DEFAULT
 #define FROM_DIRECTION		(dir == from_utf8)
 #define ONE_DIRECTION           0
 
@@ -303,12 +330,9 @@ gconv_end (struct __gconv_step *data)
     STANDARD_FROM_LOOP_ERR_HANDLER (i);					\
   }
 
-/* This hardware routine uses the Convert UTF8 to UTF32 (cu14) instruction.  */
-#define BODY_FROM_ETF3EH BODY_FROM_HW (HARDWARE_CONVERT ("cu14 %0, %1, 1"))
-
-
+#if HAVE_FROM_C == 1
 /* The software routine is copied from gconv_simple.c.  */
-#define BODY_FROM_C							\
+# define BODY_FROM_C							\
   {									\
     /* Next input byte.  */						\
     uint32_t ch = *inptr;						\
@@ -408,7 +432,50 @@ gconv_end (struct __gconv_step *data)
     outptr += sizeof (uint32_t);					\
   }
 
-#define HW_FROM_VX							\
+/* These definitions apply to the UTF-8 to UTF-32 direction.  The
+   software implementation for UTF-8 still supports multibyte
+   characters up to 6 bytes whereas the hardware variant does not.  */
+# define MIN_NEEDED_INPUT	MIN_NEEDED_FROM
+# define MAX_NEEDED_INPUT	MAX_NEEDED_FROM
+# define MIN_NEEDED_OUTPUT	MIN_NEEDED_TO
+# define FROM_LOOP_C		__from_utf8_loop_c
+# define LOOPFCT		FROM_LOOP_C
+
+# define LOOP_NEED_FLAGS
+
+# define STORE_REST		STORE_REST_COMMON
+# define UNPACK_BYTES		UNPACK_BYTES_COMMON
+# define CLEAR_STATE		CLEAR_STATE_COMMON
+# define BODY			BODY_FROM_C
+# include <iconv/loop.c>
+#else
+# define FROM_LOOP_C		NULL
+#endif /* HAVE_FROM_C != 1  */
+
+#if HAVE_FROM_CU == 1
+/* This hardware routine uses the Convert UTF8 to UTF32 (cu14) instruction.  */
+# define BODY_FROM_ETF3EH BODY_FROM_HW (HARDWARE_CONVERT ("cu14 %0, %1, 1"))
+
+/* Generate loop-function with hardware utf-convert instruction.  */
+# define MIN_NEEDED_INPUT	MIN_NEEDED_FROM
+# define MAX_NEEDED_INPUT	MAX_NEEDED_FROM
+# define MIN_NEEDED_OUTPUT	MIN_NEEDED_TO
+# define FROM_LOOP_CU		__from_utf8_loop_etf3eh
+# define LOOPFCT		FROM_LOOP_CU
+
+# define LOOP_NEED_FLAGS
+
+# define STORE_REST		STORE_REST_COMMON
+# define UNPACK_BYTES		UNPACK_BYTES_COMMON
+# define CLEAR_STATE		CLEAR_STATE_COMMON
+# define BODY			BODY_FROM_ETF3EH
+# include <iconv/loop.c>
+#else
+# define FROM_LOOP_CU		NULL
+#endif /* HAVE_FROM_CU != 1  */
+
+#if HAVE_FROM_VX == 1
+# define HW_FROM_VX							\
   {									\
     register const unsigned char* pInput asm ("8") = inptr;		\
     register size_t inlen asm ("9") = inend - inptr;			\
@@ -500,45 +567,14 @@ gconv_end (struct __gconv_step *data)
     inptr = pInput;							\
     outptr = pOutput;							\
   }
-#define BODY_FROM_VX BODY_FROM_HW (HW_FROM_VX)
+# define BODY_FROM_VX BODY_FROM_HW (HW_FROM_VX)
 
-/* These definitions apply to the UTF-8 to UTF-32 direction.  The
-   software implementation for UTF-8 still supports multibyte
-   characters up to 6 bytes whereas the hardware variant does not.  */
-#define MIN_NEEDED_INPUT	MIN_NEEDED_FROM
-#define MAX_NEEDED_INPUT	MAX_NEEDED_FROM
-#define MIN_NEEDED_OUTPUT	MIN_NEEDED_TO
-#define LOOPFCT			__from_utf8_loop_c
-
-#define LOOP_NEED_FLAGS
-
-#define STORE_REST		STORE_REST_COMMON
-#define UNPACK_BYTES		UNPACK_BYTES_COMMON
-#define CLEAR_STATE		CLEAR_STATE_COMMON
-#define BODY			BODY_FROM_C
-#include <iconv/loop.c>
-
-
-/* Generate loop-function with hardware utf-convert instruction.  */
-#define MIN_NEEDED_INPUT	MIN_NEEDED_FROM
-#define MAX_NEEDED_INPUT	MAX_NEEDED_FROM
-#define MIN_NEEDED_OUTPUT	MIN_NEEDED_TO
-#define LOOPFCT			__from_utf8_loop_etf3eh
-
-#define LOOP_NEED_FLAGS
-
-#define STORE_REST		STORE_REST_COMMON
-#define UNPACK_BYTES		UNPACK_BYTES_COMMON
-#define CLEAR_STATE		CLEAR_STATE_COMMON
-#define BODY			BODY_FROM_ETF3EH
-#include <iconv/loop.c>
-
-#if defined HAVE_S390_VX_ASM_SUPPORT
-/* Generate loop-function with hardware vector instructions.  */
+/* Generate loop-function with hardware vector and utf-convert instructions.  */
 # define MIN_NEEDED_INPUT	MIN_NEEDED_FROM
 # define MAX_NEEDED_INPUT	MAX_NEEDED_FROM
 # define MIN_NEEDED_OUTPUT	MIN_NEEDED_TO
-# define LOOPFCT		__from_utf8_loop_vx
+# define FROM_LOOP_VX		__from_utf8_loop_vx
+# define LOOPFCT		FROM_LOOP_VX
 
 # define LOOP_NEED_FLAGS
 
@@ -547,33 +583,13 @@ gconv_end (struct __gconv_step *data)
 # define CLEAR_STATE		CLEAR_STATE_COMMON
 # define BODY			BODY_FROM_VX
 # include <iconv/loop.c>
-#endif
-
-
-/* Generate ifunc'ed loop function.  */
-__typeof(__from_utf8_loop_c)
-__attribute__ ((ifunc ("__from_utf8_loop_resolver")))
-__from_utf8_loop;
-
-static void *
-__from_utf8_loop_resolver (unsigned long int dl_hwcap)
-{
-#if defined HAVE_S390_VX_ASM_SUPPORT
-  if (dl_hwcap & HWCAP_S390_VX)
-    return __from_utf8_loop_vx;
-  else
-#endif
-  if (dl_hwcap & HWCAP_S390_ZARCH && dl_hwcap & HWCAP_S390_HIGH_GPRS
-      && dl_hwcap & HWCAP_S390_ETF3EH)
-    return __from_utf8_loop_etf3eh;
-  else
-    return __from_utf8_loop_c;
-}
-
-strong_alias (__from_utf8_loop_c_single, __from_utf8_loop_single)
+#else
+# define FROM_LOOP_VX		NULL
+#endif /* HAVE_FROM_VX != 1  */
 
+#if HAVE_TO_C == 1
 /* The software routine mimics the S/390 cu41 instruction.  */
-#define BODY_TO_C						\
+# define BODY_TO_C						\
   {								\
     uint32_t wc = *((const uint32_t *) inptr);			\
 								\
@@ -657,8 +673,22 @@ strong_alias (__from_utf8_loop_c_single, __from_utf8_loop_single)
     inptr += 4;							\
   }
 
+/* Generate loop-function with software routing.  */
+# define MIN_NEEDED_INPUT	MIN_NEEDED_TO
+# define MIN_NEEDED_OUTPUT	MIN_NEEDED_FROM
+# define MAX_NEEDED_OUTPUT	MAX_NEEDED_FROM
+# define TO_LOOP_C		__to_utf8_loop_c
+# define LOOPFCT		TO_LOOP_C
+# define BODY			BODY_TO_C
+# define LOOP_NEED_FLAGS
+# include <iconv/loop.c>
+#else
+# define TO_LOOP_C		NULL
+#endif /* HAVE_TO_C != 1  */
+
+#if HAVE_TO_VX == 1
 /* The hardware routine uses the S/390 vector instructions.  */
-#define BODY_TO_VX							\
+# define BODY_TO_VX							\
   {									\
     size_t inlen = inend - inptr;					\
     size_t outlen = outend - outptr;					\
@@ -820,43 +850,22 @@ strong_alias (__from_utf8_loop_c_single, __from_utf8_loop_single)
     STANDARD_TO_LOOP_ERR_HANDLER (4);					\
   }
 
-/* Generate loop-function with software routing.  */
-#define MIN_NEEDED_INPUT	MIN_NEEDED_TO
-#define MIN_NEEDED_OUTPUT	MIN_NEEDED_FROM
-#define MAX_NEEDED_OUTPUT	MAX_NEEDED_FROM
-#define LOOPFCT			__to_utf8_loop_c
-#define BODY			BODY_TO_C
-#define LOOP_NEED_FLAGS
-#include <iconv/loop.c>
-
-#if defined HAVE_S390_VX_ASM_SUPPORT
-/* Generate loop-function with hardware vector and utf-convert instructions.  */
+/* Generate loop-function with hardware vector instructions.  */
 # define MIN_NEEDED_INPUT	MIN_NEEDED_TO
 # define MIN_NEEDED_OUTPUT	MIN_NEEDED_FROM
 # define MAX_NEEDED_OUTPUT	MAX_NEEDED_FROM
-# define LOOPFCT		__to_utf8_loop_vx
+# define TO_LOOP_VX		__to_utf8_loop_vx
+# define LOOPFCT		TO_LOOP_VX
 # define BODY			BODY_TO_VX
 # define LOOP_NEED_FLAGS
 # include <iconv/loop.c>
+#else
+# define TO_LOOP_VX		NULL
+#endif /* HAVE_TO_VX != 1  */
+
+/* This file also exists in sysdeps/s390/multiarch/ which
+   generates ifunc resolvers for FROM/TO_LOOP functions
+   and includes iconv/skeleton.c afterwards.  */
+#if ! defined USE_MULTIARCH
+# include <iconv/skeleton.c>
 #endif
-
-/* Generate ifunc'ed loop function.  */
-__typeof(__to_utf8_loop_c)
-__attribute__ ((ifunc ("__to_utf8_loop_resolver")))
-__to_utf8_loop;
-
-static void *
-__to_utf8_loop_resolver (unsigned long int dl_hwcap)
-{
-#if defined HAVE_S390_VX_ASM_SUPPORT
-  if (dl_hwcap & HWCAP_S390_VX)
-    return __to_utf8_loop_vx;
-  else
-#endif
-    return __to_utf8_loop_c;
-}
-
-strong_alias (__to_utf8_loop_c_single, __to_utf8_loop_single)
-
-
-#include <iconv/skeleton.c>