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[PATCH 18/56] S390: Refactor strcpy ifunc handling.

The ifunc handling for strcpy is adjusted in order to omit ifunc
variants if those will never be used as the minimum architecture level
already supports newer CPUs by default.
Glibc internal calls will then also use the "newer" ifunc variant.

Note: The fallback s390-32/s390-64 ifunc variants with mvst instruction
are now moved to the unified strcpy-z900.S file which can be used for
31/64bit. The s390-32/s390-64 files multiarch/strcpy.c and strcpy.S
are deleted.

ChangeLog:

	* sysdeps/s390/multiarch/Makefile
	(sysdep_routines): Remove strcpy variants.
	* sysdeps/s390/Makefile (sysdep_routines): Add strcpy variants.
	* sysdeps/s390/multiarch/ifunc-impl-list.c
	(__libc_ifunc_impl_list): Refactor ifunc handling for strcpy.
	* sysdeps/s390/multiarch/strcpy-vx.S: Move to ...
	* sysdeps/s390/strcpy-vx.S: ... here and adjust ifunc handling.
	* sysdeps/s390/multiarch/strcpy.c: Move to ...
	* sysdeps/s390/strcpy.c: ... here and adjust ifunc handling.
	* sysdeps/s390/ifunc-strcpy.h: New file.
	* sysdeps/s390/s390-64/strcpy.S: Move to ...
	* sysdeps/s390/strcpy-z900.S: ... here and adjust to be usable
	for 31/64bit and ifunc handling.
	* sysdeps/s390/s390-32/multiarch/strcpy.c: Delete file.
	* sysdeps/s390/s390-64/multiarch/strcpy.c: Likewise.
	* sysdeps/s390/s390-32/strcpy.S: Likewise.
---
 sysdeps/s390/Makefile                         |  3 +-
 sysdeps/s390/ifunc-strcpy.h                   | 52 +++++++++++++++++++
 sysdeps/s390/multiarch/Makefile               |  3 +-
 sysdeps/s390/multiarch/ifunc-impl-list.c      | 14 ++++-
 sysdeps/s390/s390-32/multiarch/strcpy.c       | 21 --------
 sysdeps/s390/s390-32/strcpy.S                 | 36 -------------
 sysdeps/s390/s390-64/multiarch/strcpy.c       | 21 --------
 sysdeps/s390/{multiarch => }/strcpy-vx.S      | 26 +++++-----
 .../s390/{s390-64/strcpy.S => strcpy-z900.S}  | 33 +++++++++---
 sysdeps/s390/{multiarch => }/strcpy.c         | 17 +++++-
 10 files changed, 123 insertions(+), 103 deletions(-)
 create mode 100644 sysdeps/s390/ifunc-strcpy.h
 delete mode 100644 sysdeps/s390/s390-32/multiarch/strcpy.c
 delete mode 100644 sysdeps/s390/s390-32/strcpy.S
 delete mode 100644 sysdeps/s390/s390-64/multiarch/strcpy.c
 rename sysdeps/s390/{multiarch => }/strcpy-vx.S (85%)
 rename sysdeps/s390/{s390-64/strcpy.S => strcpy-z900.S} (66%)
 rename sysdeps/s390/{multiarch => }/strcpy.c (69%)

diff --git a/sysdeps/s390/Makefile b/sysdeps/s390/Makefile
index 4390af56b3..af9482adc3 100644
--- a/sysdeps/s390/Makefile
+++ b/sysdeps/s390/Makefile
@@ -61,5 +61,6 @@ sysdep_routines += bzero memset memset-z900 \
 		   strstr strstr-vx strstr-c \
 		   memmem memmem-vx memmem-c \
 		   strlen strlen-vx strlen-c \
-		   strnlen strnlen-vx strnlen-c
+		   strnlen strnlen-vx strnlen-c \
+		   strcpy strcpy-vx strcpy-z900
 endif
diff --git a/sysdeps/s390/ifunc-strcpy.h b/sysdeps/s390/ifunc-strcpy.h
new file mode 100644
index 0000000000..85e45556e6
--- /dev/null
+++ b/sysdeps/s390/ifunc-strcpy.h
@@ -0,0 +1,52 @@
+/* strcpy variant information on S/390 version.
+   Copyright (C) 2018 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/>.  */
+
+#if defined USE_MULTIARCH && IS_IN (libc)		\
+  && ! defined HAVE_S390_MIN_Z13_ZARCH_ASM_SUPPORT
+# define HAVE_STRCPY_IFUNC	1
+#else
+# define HAVE_STRCPY_IFUNC	0
+#endif
+
+#ifdef HAVE_S390_VX_ASM_SUPPORT
+# define HAVE_STRCPY_IFUNC_AND_VX_SUPPORT HAVE_STRCPY_IFUNC
+#else
+# define HAVE_STRCPY_IFUNC_AND_VX_SUPPORT 0
+#endif
+
+#if defined HAVE_S390_MIN_Z13_ZARCH_ASM_SUPPORT
+# define STRCPY_DEFAULT		STRCPY_Z13
+# define HAVE_STRCPY_Z900_G5	0
+# define HAVE_STRCPY_Z13	1
+#else
+# define STRCPY_DEFAULT		STRCPY_Z900_G5
+# define HAVE_STRCPY_Z900_G5	1
+# define HAVE_STRCPY_Z13	HAVE_STRCPY_IFUNC_AND_VX_SUPPORT
+#endif
+
+#if HAVE_STRCPY_Z900_G5
+# define STRCPY_Z900_G5		__strcpy_default
+#else
+# define STRCPY_Z900_G5		NULL
+#endif
+
+#if HAVE_STRCPY_Z13
+# define STRCPY_Z13		__strcpy_vx
+#else
+# define STRCPY_Z13		NULL
+#endif
diff --git a/sysdeps/s390/multiarch/Makefile b/sysdeps/s390/multiarch/Makefile
index 35ba223c5d..50f7f0b78d 100644
--- a/sysdeps/s390/multiarch/Makefile
+++ b/sysdeps/s390/multiarch/Makefile
@@ -1,6 +1,5 @@
 ifeq ($(subdir),string)
-sysdep_routines += strcpy strcpy-vx \
-		   stpcpy stpcpy-vx stpcpy-c \
+sysdep_routines += stpcpy stpcpy-vx stpcpy-c \
 		   strncpy strncpy-vx \
 		   stpncpy stpncpy-vx stpncpy-c \
 		   strcat strcat-vx strcat-c \
diff --git a/sysdeps/s390/multiarch/ifunc-impl-list.c b/sysdeps/s390/multiarch/ifunc-impl-list.c
index 680e5b738b..1784372db9 100644
--- a/sysdeps/s390/multiarch/ifunc-impl-list.c
+++ b/sysdeps/s390/multiarch/ifunc-impl-list.c
@@ -28,6 +28,7 @@
 #include <ifunc-memmem.h>
 #include <ifunc-strlen.h>
 #include <ifunc-strnlen.h>
+#include <ifunc-strcpy.h>
 
 /* Maximum number of IFUNC implementations.  */
 #define MAX_IFUNC	3
@@ -190,6 +191,18 @@ __libc_ifunc_impl_list (const char *name, struct libc_ifunc_impl *array,
 		)
 #endif /* HAVE_STRNLEN_IFUNC  */
 
+#if HAVE_STRCPY_IFUNC
+    IFUNC_IMPL (i, name, strcpy,
+# if HAVE_STRCPY_Z13
+		IFUNC_IMPL_ADD (array, i, strcpy,
+				dl_hwcap & HWCAP_S390_VX, STRCPY_Z13)
+# endif
+# if HAVE_STRCPY_Z900_G5
+		IFUNC_IMPL_ADD (array, i, strcpy, 1, STRCPY_Z900_G5)
+# endif
+		)
+#endif /* HAVE_STRCPY_IFUNC  */
+
 #ifdef HAVE_S390_VX_ASM_SUPPORT
 
 # define IFUNC_VX_IMPL(FUNC)						\
@@ -202,7 +215,6 @@ __libc_ifunc_impl_list (const char *name, struct libc_ifunc_impl *array,
 
   IFUNC_VX_IMPL (wcsnlen);
 
-  IFUNC_VX_IMPL (strcpy);
   IFUNC_VX_IMPL (wcscpy);
 
   IFUNC_VX_IMPL (stpcpy);
diff --git a/sysdeps/s390/s390-32/multiarch/strcpy.c b/sysdeps/s390/s390-32/multiarch/strcpy.c
deleted file mode 100644
index 6a22e31a03..0000000000
--- a/sysdeps/s390/s390-32/multiarch/strcpy.c
+++ /dev/null
@@ -1,21 +0,0 @@
-/* Multiple versions of strcpy.
-   Copyright (C) 2015-2018 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/>.  */
-
-/* This wrapper-file is needed, because otherwise file
-   sysdeps/s390/s390-[32|64]/strcpy.S will be used.  */
-#include <sysdeps/s390/multiarch/strcpy.c>
diff --git a/sysdeps/s390/s390-32/strcpy.S b/sysdeps/s390/s390-32/strcpy.S
deleted file mode 100644
index d49136ee92..0000000000
--- a/sysdeps/s390/s390-32/strcpy.S
+++ /dev/null
@@ -1,36 +0,0 @@
-/* strcpy - copy a string from source to destination. For IBM S390
-   This file is part of the GNU C Library.
-   Copyright (C) 2000-2018 Free Software Foundation, Inc.
-   Contributed by Martin Schwidefsky (schwidefsky@de.ibm.com).
-
-   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/>.  */
-
-/*
- * R2 = address of destination
- * R3 = address of source
- */
-
-#include "sysdep.h"
-#include "asm-syntax.h"
-
-	.text
-ENTRY(strcpy)
-	slr   %r0,%r0
-	lr    %r1,%r2
-0:      mvst  %r1,%r3
-	jo    0b
-	br    %r14
-END(strcpy)
-libc_hidden_builtin_def (strcpy)
diff --git a/sysdeps/s390/s390-64/multiarch/strcpy.c b/sysdeps/s390/s390-64/multiarch/strcpy.c
deleted file mode 100644
index 6a22e31a03..0000000000
--- a/sysdeps/s390/s390-64/multiarch/strcpy.c
+++ /dev/null
@@ -1,21 +0,0 @@
-/* Multiple versions of strcpy.
-   Copyright (C) 2015-2018 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/>.  */
-
-/* This wrapper-file is needed, because otherwise file
-   sysdeps/s390/s390-[32|64]/strcpy.S will be used.  */
-#include <sysdeps/s390/multiarch/strcpy.c>
diff --git a/sysdeps/s390/multiarch/strcpy-vx.S b/sysdeps/s390/strcpy-vx.S
similarity index 85%
rename from sysdeps/s390/multiarch/strcpy-vx.S
rename to sysdeps/s390/strcpy-vx.S
index 52197f57f7..844d23e4fe 100644
--- a/sysdeps/s390/multiarch/strcpy-vx.S
+++ b/sysdeps/s390/strcpy-vx.S
@@ -16,13 +16,13 @@
    License along with the GNU C Library; if not, see
    <http://www.gnu.org/licenses/>.  */
 
-#if defined HAVE_S390_VX_ASM_SUPPORT && IS_IN (libc)
-
-# include "sysdep.h"
-# include "asm-syntax.h"
+#include <ifunc-strcpy.h>
+#include "sysdep.h"
+#include "asm-syntax.h"
 
 	.text
 
+#if HAVE_STRCPY_Z13
 /* char * strcpy (const char *dest, const char *src)
    Copy string src to dest.
 
@@ -36,7 +36,7 @@
    -v17=index of zero
    -v18=part of src
 */
-ENTRY(__strcpy_vx)
+ENTRY(STRCPY_Z13)
 	.machine "z13"
 	.machinemode "zarch_nohighgprs"
 
@@ -97,13 +97,13 @@ ENTRY(__strcpy_vx)
 .Lfound_align:
 	vstl	%v16,%r5,0(%r2)	/* Copy characters including zero.  */
 	br	%r14
-END(__strcpy_vx)
+END(STRCPY_Z13)
 
-/* Use mvst-strcpy-implementation as default implementation.  */
-# define strcpy __strcpy_c
-# undef libc_hidden_builtin_def
-# define libc_hidden_builtin_def(name) strong_alias(__strcpy_c, __GI_strcpy)
-#endif /* HAVE_S390_VX_ASM_SUPPORT && IS_IN (libc) */
+# if ! HAVE_STRCPY_IFUNC
+strong_alias (STRCPY_Z13, strcpy)
+# endif
 
-/* Include mvst-strcpy-implementation in s390-32/s390-64 subdirectory.  */
-#include <strcpy.S>
+# if ! HAVE_STRCPY_Z900_G5 && defined SHARED && IS_IN (libc)
+strong_alias (STRCPY_Z13, __GI_strcpy)
+# endif
+#endif
diff --git a/sysdeps/s390/s390-64/strcpy.S b/sysdeps/s390/strcpy-z900.S
similarity index 66%
rename from sysdeps/s390/s390-64/strcpy.S
rename to sysdeps/s390/strcpy-z900.S
index 203c73c905..42798b1fd5 100644
--- a/sysdeps/s390/s390-64/strcpy.S
+++ b/sysdeps/s390/strcpy-z900.S
@@ -1,4 +1,4 @@
-/* strcpy - copy a string from source to destination.  64 bit S/390 version.
+/* strcpy - copy a string from source to destination.  64/31 bit S/390 version.
    Copyright (C) 2001-2018 Free Software Foundation, Inc.
    Contributed by Martin Schwidefsky (schwidefsky@de.ibm.com).
    This file is part of the GNU C Library.
@@ -21,15 +21,36 @@
      %r2 = address of destination
      %r3 = address of source.  */
 
+#include <ifunc-strcpy.h>
 #include "sysdep.h"
 #include "asm-syntax.h"
 
+#if HAVE_STRCPY_Z900_G5
+# if defined __s390x__
+#  define SLGR	slgr
+#  define LGR	lgr
+# else
+#  define SLGR	slr
+#  define LGR	lr
+# endif /* ! defined __s390x__  */
+
         .text
-ENTRY(strcpy)
-	slgr  %r0,%r0
-	lgr   %r1,%r2
+ENTRY(STRCPY_Z900_G5)
+	SLGR  %r0,%r0
+	LGR   %r1,%r2
 0:	mvst  %r1,%r3
 	jo    0b
 	br    %r14
-END(strcpy)
-libc_hidden_builtin_def (strcpy)
+END(STRCPY_Z900_G5)
+
+# undef SLGR
+# undef LGR
+
+# if ! HAVE_STRCPY_IFUNC
+strong_alias (STRCPY_Z900_G5, strcpy)
+# endif
+
+# if defined SHARED && IS_IN (libc)
+strong_alias (STRCPY_Z900_G5, __GI_strcpy)
+# endif
+#endif
diff --git a/sysdeps/s390/multiarch/strcpy.c b/sysdeps/s390/strcpy.c
similarity index 69%
rename from sysdeps/s390/multiarch/strcpy.c
rename to sysdeps/s390/strcpy.c
index 8f32a13f67..f4e28e24c8 100644
--- a/sysdeps/s390/multiarch/strcpy.c
+++ b/sysdeps/s390/strcpy.c
@@ -16,12 +16,25 @@
    License along with the GNU C Library; if not, see
    <http://www.gnu.org/licenses/>.  */
 
-#if defined HAVE_S390_VX_ASM_SUPPORT && IS_IN (libc)
+#include <ifunc-strcpy.h>
+
+#if HAVE_STRCPY_IFUNC
 # define strcpy __redirect_strcpy
 # include <string.h>
 # undef strcpy
 # include <ifunc-resolve.h>
 
-s390_vx_libc_ifunc2_redirected (__redirect_strcpy, __strcpy, strcpy)
+# if HAVE_STRCPY_Z900_G5
+extern __typeof (__redirect_strcpy) STRCPY_Z900_G5 attribute_hidden;
+# endif
+
+# if HAVE_STRCPY_Z13
+extern __typeof (__redirect_strcpy) STRCPY_Z13 attribute_hidden;
+# endif
 
+s390_libc_ifunc_expr (__redirect_strcpy, strcpy,
+		      (HAVE_STRCPY_Z13 && (hwcap & HWCAP_S390_VX))
+		      ? STRCPY_Z13
+		      : STRCPY_DEFAULT
+		      )
 #endif
-- 
2.17.0
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