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commit 8e5a0afbbf0a96fb873e27aa064c9bacc9cfd9c6
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Author: Stefan Liebler <stli@linux.ibm.com>
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Date: Tue Dec 18 13:57:12 2018 +0100
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S390: Refactor strcat ifunc handling.
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The ifunc handling for strcat is adjusted in order to omit ifunc
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variants if those will never be used as the minimum architecture level
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already supports newer CPUs by default.
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Glibc internal calls will then also use the "newer" ifunc variant.
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ChangeLog:
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* sysdeps/s390/multiarch/Makefile
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(sysdep_routines): Remove strcat variants.
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* sysdeps/s390/Makefile (sysdep_routines): Add strcat variants.
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* sysdeps/s390/multiarch/ifunc-impl-list.c
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(__libc_ifunc_impl_list): Refactor ifunc handling for strcat.
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* sysdeps/s390/multiarch/strcat-c.c: Move to ...
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* sysdeps/s390/strcat-c.c: ... here and adjust ifunc handling.
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* sysdeps/s390/multiarch/strcat-vx.S: Move to ...
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* sysdeps/s390/strcat-vx.S: ... here and adjust ifunc handling.
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* sysdeps/s390/multiarch/strcat.c: Move to ...
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* sysdeps/s390/strcat.c: ... here and adjust ifunc handling.
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* sysdeps/s390/ifunc-strcat.h: New file.
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diff --git a/sysdeps/s390/Makefile b/sysdeps/s390/Makefile
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index a9882b3996c30322..de2d5e5652dde412 100644
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--- a/sysdeps/s390/Makefile
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+++ b/sysdeps/s390/Makefile
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@@ -42,5 +42,6 @@ sysdep_routines += bzero memset memset-z900 \
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strcpy strcpy-vx strcpy-z900 \
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stpcpy stpcpy-vx stpcpy-c \
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strncpy strncpy-vx strncpy-z900 \
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- stpncpy stpncpy-vx stpncpy-c
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+ stpncpy stpncpy-vx stpncpy-c \
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+ strcat strcat-vx strcat-c
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endif
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diff --git a/sysdeps/s390/ifunc-strcat.h b/sysdeps/s390/ifunc-strcat.h
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new file mode 100644
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index 0000000000000000..6fd2f7dd31fff64f
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--- /dev/null
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+++ b/sysdeps/s390/ifunc-strcat.h
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@@ -0,0 +1,52 @@
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+/* strcat variant information on S/390 version.
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+ Copyright (C) 2018 Free Software Foundation, Inc.
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+ This file is part of the GNU C Library.
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+
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+ The GNU C Library is free software; you can redistribute it and/or
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+ modify it under the terms of the GNU Lesser General Public
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+ License as published by the Free Software Foundation; either
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+ version 2.1 of the License, or (at your option) any later version.
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+
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+ The GNU C Library is distributed in the hope that it will be useful,
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+ but WITHOUT ANY WARRANTY; without even the implied warranty of
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+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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+ Lesser General Public License for more details.
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+
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+ You should have received a copy of the GNU Lesser General Public
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+ License along with the GNU C Library; if not, see
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+ <http://www.gnu.org/licenses/>. */
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+
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+#if defined USE_MULTIARCH && IS_IN (libc) \
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+ && ! defined HAVE_S390_MIN_Z13_ZARCH_ASM_SUPPORT
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+# define HAVE_STRCAT_IFUNC 1
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+#else
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+# define HAVE_STRCAT_IFUNC 0
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+#endif
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+
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+#ifdef HAVE_S390_VX_ASM_SUPPORT
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+# define HAVE_STRCAT_IFUNC_AND_VX_SUPPORT HAVE_STRCAT_IFUNC
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+#else
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+# define HAVE_STRCAT_IFUNC_AND_VX_SUPPORT 0
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+#endif
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+
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+#if defined HAVE_S390_MIN_Z13_ZARCH_ASM_SUPPORT
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+# define STRCAT_DEFAULT STRCAT_Z13
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+# define HAVE_STRCAT_C 0
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+# define HAVE_STRCAT_Z13 1
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+#else
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+# define STRCAT_DEFAULT STRCAT_C
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+# define HAVE_STRCAT_C 1
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+# define HAVE_STRCAT_Z13 HAVE_STRCAT_IFUNC_AND_VX_SUPPORT
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+#endif
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+
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+#if HAVE_STRCAT_C
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+# define STRCAT_C __strcat_c
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+#else
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+# define STRCAT_C NULL
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+#endif
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+
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+#if HAVE_STRCAT_Z13
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+# define STRCAT_Z13 __strcat_vx
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+#else
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+# define STRCAT_Z13 NULL
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+#endif
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diff --git a/sysdeps/s390/multiarch/Makefile b/sysdeps/s390/multiarch/Makefile
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index 3d97d21da1fc852b..9b66237aaf9eb47e 100644
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--- a/sysdeps/s390/multiarch/Makefile
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+++ b/sysdeps/s390/multiarch/Makefile
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@@ -1,6 +1,5 @@
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ifeq ($(subdir),string)
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-sysdep_routines += strcat strcat-vx strcat-c \
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- strncat strncat-vx strncat-c \
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+sysdep_routines += strncat strncat-vx strncat-c \
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strcmp strcmp-vx \
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strncmp strncmp-vx strncmp-c \
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strchr strchr-vx strchr-c \
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diff --git a/sysdeps/s390/multiarch/ifunc-impl-list.c b/sysdeps/s390/multiarch/ifunc-impl-list.c
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index 021e9f247fff44df..1b7f3df3a3cfe561 100644
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--- a/sysdeps/s390/multiarch/ifunc-impl-list.c
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+++ b/sysdeps/s390/multiarch/ifunc-impl-list.c
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@@ -32,6 +32,7 @@
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#include <ifunc-stpcpy.h>
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#include <ifunc-strncpy.h>
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#include <ifunc-stpncpy.h>
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+#include <ifunc-strcat.h>
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/* Maximum number of IFUNC implementations. */
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#define MAX_IFUNC 3
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@@ -242,6 +243,17 @@ __libc_ifunc_impl_list (const char *name, struct libc_ifunc_impl *array,
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)
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#endif /* HAVE_STPNCPY_IFUNC */
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+#if HAVE_STRCAT_IFUNC
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+ IFUNC_IMPL (i, name, strcat,
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+# if HAVE_STRCAT_Z13
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+ IFUNC_IMPL_ADD (array, i, strcat,
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+ dl_hwcap & HWCAP_S390_VX, STRCAT_Z13)
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+# endif
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+# if HAVE_STRCAT_C
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+ IFUNC_IMPL_ADD (array, i, strcat, 1, STRCAT_C)
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+# endif
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+ )
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+#endif /* HAVE_STRCAT_IFUNC */
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#ifdef HAVE_S390_VX_ASM_SUPPORT
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@@ -263,7 +275,6 @@ __libc_ifunc_impl_list (const char *name, struct libc_ifunc_impl *array,
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IFUNC_VX_IMPL (wcpncpy);
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- IFUNC_VX_IMPL (strcat);
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IFUNC_VX_IMPL (wcscat);
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IFUNC_VX_IMPL (strncat);
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diff --git a/sysdeps/s390/multiarch/strcat-c.c b/sysdeps/s390/strcat-c.c
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similarity index 73%
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rename from sysdeps/s390/multiarch/strcat-c.c
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rename to sysdeps/s390/strcat-c.c
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index f871faa7b563e74b..7accc6c7ef80ecf2 100644
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--- a/sysdeps/s390/multiarch/strcat-c.c
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+++ b/sysdeps/s390/strcat-c.c
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@@ -16,13 +16,17 @@
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>. */
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-#if defined HAVE_S390_VX_ASM_SUPPORT && IS_IN (libc)
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-# define STRCAT __strcat_c
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-# ifdef SHARED
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-# undef libc_hidden_builtin_def
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-# define libc_hidden_builtin_def(name) \
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- __hidden_ver1 (__strcat_c, __GI_strcat, __strcat_c);
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-# endif /* SHARED */
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+#include <ifunc-strcat.h>
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+
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+#if HAVE_STRCAT_C
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+# if HAVE_STRCAT_IFUNC
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+# define STRCAT STRCAT_C
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+# if defined SHARED && IS_IN (libc)
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+# undef libc_hidden_builtin_def
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+# define libc_hidden_builtin_def(name) \
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+ __hidden_ver1 (__strcat_c, __GI_strcat, __strcat_c);
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+# endif
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+# endif
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# include <string/strcat.c>
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-#endif /* HAVE_S390_VX_ASM_SUPPORT && IS_IN (libc) */
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+#endif
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diff --git a/sysdeps/s390/multiarch/strcat-vx.S b/sysdeps/s390/strcat-vx.S
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similarity index 94%
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rename from sysdeps/s390/multiarch/strcat-vx.S
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rename to sysdeps/s390/strcat-vx.S
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index 3abbbcccedad0eb4..218e301f10c6abe3 100644
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--- a/sysdeps/s390/multiarch/strcat-vx.S
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+++ b/sysdeps/s390/strcat-vx.S
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@@ -16,7 +16,8 @@
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>. */
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-#if defined HAVE_S390_VX_ASM_SUPPORT && IS_IN (libc)
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+#include <ifunc-strcat.h>
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+#if HAVE_STRCAT_Z13
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# include "sysdep.h"
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# include "asm-syntax.h"
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@@ -37,7 +38,7 @@
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-v17=index of zero
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-v18=part of src
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*/
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-ENTRY(__strcat_vx)
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+ENTRY(STRCAT_Z13)
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.machine "z13"
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.machinemode "zarch_nohighgprs"
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@@ -157,5 +158,13 @@ ENTRY(__strcat_vx)
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vstl %v16,%r5,0(%r2) /* Copy characters including zero. */
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lgr %r2,%r0 /* Load saved dest-ptr. */
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br %r14
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-END(__strcat_vx)
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-#endif /* HAVE_S390_VX_ASM_SUPPORT && IS_IN (libc) */
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+END(STRCAT_Z13)
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+
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+# if ! HAVE_STRCAT_IFUNC
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+strong_alias (STRCAT_Z13, strcat)
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+# endif
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+
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+# if ! HAVE_STRCAT_C && defined SHARED && IS_IN (libc)
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+strong_alias (STRCAT_Z13, __GI_strcat)
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+# endif
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+#endif
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diff --git a/sysdeps/s390/multiarch/strcat.c b/sysdeps/s390/strcat.c
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similarity index 69%
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rename from sysdeps/s390/multiarch/strcat.c
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rename to sysdeps/s390/strcat.c
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index 7d4126b44f23679a..d378519c8af59620 100644
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--- a/sysdeps/s390/multiarch/strcat.c
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+++ b/sysdeps/s390/strcat.c
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@@ -16,14 +16,25 @@
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>. */
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-#if defined HAVE_S390_VX_ASM_SUPPORT && IS_IN (libc)
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+#include <ifunc-strcat.h>
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+
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+#if HAVE_STRCAT_IFUNC
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# define strcat __redirect_strcat
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# include <string.h>
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# undef strcat
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# include <ifunc-resolve.h>
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-s390_vx_libc_ifunc2_redirected (__redirect_strcat, __strcat, strcat)
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+# if HAVE_STRCAT_C
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+extern __typeof (__redirect_strcat) STRCAT_C attribute_hidden;
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+# endif
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+
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+# if HAVE_STRCAT_Z13
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+extern __typeof (__redirect_strcat) STRCAT_Z13 attribute_hidden;
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+# endif
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-#else
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-# include <string/strcat.c>
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-#endif /* !(defined HAVE_S390_VX_ASM_SUPPORT && IS_IN (libc)) */
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+s390_libc_ifunc_expr (__redirect_strcat, strcat,
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+ (HAVE_STRCAT_Z13 && (hwcap & HWCAP_S390_VX))
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+ ? STRCAT_Z13
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+ : STRCAT_DEFAULT
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+ )
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+#endif
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