glibc/SOURCES/glibc-rh1659438-19.patch

commit 970449311ded3cacb6058c96143dd4c057900589
Author: Stefan Liebler <stli@linux.ibm.com>
Date:   Tue Dec 18 13:57:11 2018 +0100

    S390: Refactor stpcpy ifunc handling.
    
    The ifunc handling for stpcpy 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.
    
    ChangeLog:
    
            * sysdeps/s390/multiarch/Makefile
            (sysdep_routines): Remove stpcpy variants.
            * sysdeps/s390/Makefile (sysdep_routines): Add stpcpy variants.
            * sysdeps/s390/multiarch/ifunc-impl-list.c
            (__libc_ifunc_impl_list): Refactor ifunc handling for stpcpy.
            * sysdeps/s390/multiarch/stpcpy-c.c: Move to ...
            * sysdeps/s390/stpcpy-c.c: ... here and adjust ifunc handling.
            * sysdeps/s390/multiarch/stpcpy-vx.S: Move to ...
            * sysdeps/s390/stpcpy-vx.S: ... here and adjust ifunc handling.
            * sysdeps/s390/multiarch/stpcpy.c: Move to ...
            * sysdeps/s390/stpcpy.c: ... here and adjust ifunc handling.
            * sysdeps/s390/ifunc-stpcpy.h: New file.

diff --git a/sysdeps/s390/Makefile b/sysdeps/s390/Makefile
index e4191319531ecb01..b7e1bc8aecf2f8c9 100644
--- a/sysdeps/s390/Makefile
+++ b/sysdeps/s390/Makefile
@@ -39,5 +39,6 @@ sysdep_routines += bzero memset memset-z900 \
 		   memmem memmem-vx memmem-c \
 		   strlen strlen-vx strlen-c \
 		   strnlen strnlen-vx strnlen-c \
-		   strcpy strcpy-vx strcpy-z900
+		   strcpy strcpy-vx strcpy-z900 \
+		   stpcpy stpcpy-vx stpcpy-c
 endif
diff --git a/sysdeps/s390/ifunc-stpcpy.h b/sysdeps/s390/ifunc-stpcpy.h
new file mode 100644
index 0000000000000000..9a70cd7c8c4f4582
--- /dev/null
+++ b/sysdeps/s390/ifunc-stpcpy.h
@@ -0,0 +1,52 @@
+/* stpcpy 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_STPCPY_IFUNC	1
+#else
+# define HAVE_STPCPY_IFUNC	0
+#endif
+
+#ifdef HAVE_S390_VX_ASM_SUPPORT
+# define HAVE_STPCPY_IFUNC_AND_VX_SUPPORT HAVE_STPCPY_IFUNC
+#else
+# define HAVE_STPCPY_IFUNC_AND_VX_SUPPORT 0
+#endif
+
+#if defined HAVE_S390_MIN_Z13_ZARCH_ASM_SUPPORT
+# define STPCPY_DEFAULT		STPCPY_Z13
+# define HAVE_STPCPY_C		0
+# define HAVE_STPCPY_Z13	1
+#else
+# define STPCPY_DEFAULT		STPCPY_C
+# define HAVE_STPCPY_C		1
+# define HAVE_STPCPY_Z13	HAVE_STPCPY_IFUNC_AND_VX_SUPPORT
+#endif
+
+#if HAVE_STPCPY_C
+# define STPCPY_C		__stpcpy_c
+#else
+# define STPCPY_C		NULL
+#endif
+
+#if HAVE_STPCPY_Z13
+# define STPCPY_Z13		__stpcpy_vx
+#else
+# define STPCPY_Z13		NULL
+#endif
diff --git a/sysdeps/s390/multiarch/Makefile b/sysdeps/s390/multiarch/Makefile
index 50f7f0b78df723bb..9517417dcbe1c701 100644
--- a/sysdeps/s390/multiarch/Makefile
+++ b/sysdeps/s390/multiarch/Makefile
@@ -1,6 +1,5 @@
 ifeq ($(subdir),string)
-sysdep_routines += stpcpy stpcpy-vx stpcpy-c \
-		   strncpy strncpy-vx \
+sysdep_routines += strncpy strncpy-vx \
 		   stpncpy stpncpy-vx stpncpy-c \
 		   strcat strcat-vx strcat-c \
 		   strncat strncat-vx strncat-c \
diff --git a/sysdeps/s390/multiarch/ifunc-impl-list.c b/sysdeps/s390/multiarch/ifunc-impl-list.c
index 1784372db9828463..678ed13833332f11 100644
--- a/sysdeps/s390/multiarch/ifunc-impl-list.c
+++ b/sysdeps/s390/multiarch/ifunc-impl-list.c
@@ -29,6 +29,7 @@
 #include <ifunc-strlen.h>
 #include <ifunc-strnlen.h>
 #include <ifunc-strcpy.h>
+#include <ifunc-stpcpy.h>
 
 /* Maximum number of IFUNC implementations.  */
 #define MAX_IFUNC	3
@@ -203,6 +204,18 @@ __libc_ifunc_impl_list (const char *name, struct libc_ifunc_impl *array,
 		)
 #endif /* HAVE_STRCPY_IFUNC  */
 
+#if HAVE_STPCPY_IFUNC
+    IFUNC_IMPL (i, name, stpcpy,
+# if HAVE_STPCPY_Z13
+		IFUNC_IMPL_ADD (array, i, stpcpy,
+				dl_hwcap & HWCAP_S390_VX, STPCPY_Z13)
+# endif
+# if HAVE_STPCPY_C
+		IFUNC_IMPL_ADD (array, i, stpcpy, 1, STPCPY_C)
+# endif
+		)
+#endif /* HAVE_STPCPY_IFUNC  */
+
 #ifdef HAVE_S390_VX_ASM_SUPPORT
 
 # define IFUNC_VX_IMPL(FUNC)						\
@@ -217,7 +230,6 @@ __libc_ifunc_impl_list (const char *name, struct libc_ifunc_impl *array,
 
   IFUNC_VX_IMPL (wcscpy);
 
-  IFUNC_VX_IMPL (stpcpy);
   IFUNC_VX_IMPL (wcpcpy);
 
   IFUNC_VX_IMPL (strncpy);
diff --git a/sysdeps/s390/multiarch/stpcpy-c.c b/sysdeps/s390/stpcpy-c.c
similarity index 74%
rename from sysdeps/s390/multiarch/stpcpy-c.c
rename to sysdeps/s390/stpcpy-c.c
index 4a1c3e5832c9b544..76ec88462717799c 100644
--- a/sysdeps/s390/multiarch/stpcpy-c.c
+++ b/sysdeps/s390/stpcpy-c.c
@@ -16,20 +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)
-# define STPCPY  __stpcpy_c
-# undef weak_alias
-# define weak_alias(a, b)
-# ifdef SHARED
-#  undef libc_hidden_def
-#  define libc_hidden_def(name)					\
+#include <ifunc-stpcpy.h>
+
+#if HAVE_STPCPY_C
+# if HAVE_STPCPY_IFUNC
+#  define STPCPY STPCPY_C
+
+#  undef weak_alias
+#  define weak_alias(a, b)
+
+#  if defined SHARED && IS_IN (libc)
+#   undef libc_hidden_def
+#   define libc_hidden_def(name)				\
   __hidden_ver1 (__stpcpy_c, __GI___stpcpy, __stpcpy_c);
-#  undef libc_hidden_builtin_def
-#  define libc_hidden_builtin_def(name)				\
+#   undef libc_hidden_builtin_def
+#   define libc_hidden_builtin_def(name)			\
   strong_alias (__stpcpy_c, __stpcpy_c_1);			\
   __hidden_ver1 (__stpcpy_c_1, __GI_stpcpy, __stpcpy_c_1);
-# endif /* SHARED */
-
+#  endif
+# endif
 
 # include <string/stpcpy.c>
-#endif /* HAVE_S390_VX_ASM_SUPPORT && IS_IN (libc) */
+#endif
diff --git a/sysdeps/s390/multiarch/stpcpy-vx.S b/sysdeps/s390/stpcpy-vx.S
similarity index 90%
rename from sysdeps/s390/multiarch/stpcpy-vx.S
rename to sysdeps/s390/stpcpy-vx.S
index 6c17def0fc35d60d..d2db02d0cd714d27 100644
--- a/sysdeps/s390/multiarch/stpcpy-vx.S
+++ b/sysdeps/s390/stpcpy-vx.S
@@ -16,7 +16,9 @@
    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-stpcpy.h>
+
+#if HAVE_STPCPY_Z13
 
 # include "sysdep.h"
 # include "asm-syntax.h"
@@ -36,7 +38,7 @@
    -v17=index of zero
    -v18=part of src
 */
-ENTRY(__stpcpy_vx)
+ENTRY(STPCPY_Z13)
 	.machine "z13"
 	.machinemode "zarch_nohighgprs"
 
@@ -100,5 +102,15 @@ ENTRY(__stpcpy_vx)
 	vstl	%v16,%r5,0(%r2)	/* Copy characters including zero.  */
 	la	%r2,0(%r5,%r2)	/* Return pointer to zero.  */
 	br	%r14
-END(__stpcpy_vx)
-#endif /* HAVE_S390_VX_ASM_SUPPORT && IS_IN (libc) */
+END(STPCPY_Z13)
+
+# if ! HAVE_STPCPY_IFUNC
+strong_alias (STPCPY_Z13, __stpcpy)
+weak_alias (__stpcpy, stpcpy)
+# endif
+
+# if ! HAVE_STPCPY_C && defined SHARED && IS_IN (libc)
+strong_alias (STPCPY_Z13, __GI_stpcpy)
+strong_alias (STPCPY_Z13, __GI___stpcpy)
+# endif
+#endif
diff --git a/sysdeps/s390/multiarch/stpcpy.c b/sysdeps/s390/stpcpy.c
similarity index 74%
rename from sysdeps/s390/multiarch/stpcpy.c
rename to sysdeps/s390/stpcpy.c
index 654f9dfbef512e34..670604e2de3806b7 100644
--- a/sysdeps/s390/multiarch/stpcpy.c
+++ b/sysdeps/s390/stpcpy.c
@@ -16,7 +16,9 @@
    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-stpcpy.h>
+
+#if HAVE_STPCPY_IFUNC
 # define stpcpy __redirect_stpcpy
 # define __stpcpy __redirect___stpcpy
 /* Omit the stpcpy inline definitions because it would redefine stpcpy.  */
@@ -27,9 +29,18 @@
 # undef __stpcpy
 # include <ifunc-resolve.h>
 
-s390_vx_libc_ifunc_redirected (__redirect___stpcpy, __stpcpy);
-weak_alias (__stpcpy, stpcpy)
+# if HAVE_STPCPY_C
+extern __typeof (__redirect_stpcpy) STPCPY_C attribute_hidden;
+# endif
 
-#else
-# include <string/stpcpy.c>
-#endif /* !(defined HAVE_S390_VX_ASM_SUPPORT && IS_IN (libc)) */
+# if HAVE_STPCPY_Z13
+extern __typeof (__redirect_stpcpy) STPCPY_Z13 attribute_hidden;
+# endif
+
+s390_libc_ifunc_expr (__redirect___stpcpy, __stpcpy,
+		      (HAVE_STPCPY_Z13 && (hwcap & HWCAP_S390_VX))
+		      ? STPCPY_Z13
+		      : STPCPY_DEFAULT
+		      )
+weak_alias (__stpcpy, stpcpy)
+#endif