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commit b935335155d65971fe2a54e32c0eb74303d4e4fc
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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 strncat ifunc handling.
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The ifunc handling for strncat 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 strncat variants.
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* sysdeps/s390/Makefile (sysdep_routines): Add strncat variants.
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* sysdeps/s390/multiarch/ifunc-impl-list.c
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(__libc_ifunc_impl_list): Refactor ifunc handling for strncat.
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* sysdeps/s390/multiarch/strncat-c.c: Move to ...
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* sysdeps/s390/strncat-c.c: ... here and adjust ifunc handling.
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* sysdeps/s390/multiarch/strncat-vx.S: Move to ...
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* sysdeps/s390/strncat-vx.S: ... here and adjust ifunc handling.
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* sysdeps/s390/multiarch/strncat.c: Move to ...
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* sysdeps/s390/strncat.c: ... here and adjust ifunc handling.
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* sysdeps/s390/ifunc-strncat.h: New file.
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diff --git a/sysdeps/s390/Makefile b/sysdeps/s390/Makefile
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index de2d5e5652dde412..cb5dc1d4f95fd11c 100644
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--- a/sysdeps/s390/Makefile
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+++ b/sysdeps/s390/Makefile
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@@ -43,5 +43,6 @@ sysdep_routines += bzero memset memset-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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- strcat strcat-vx strcat-c
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+ strcat strcat-vx strcat-c \
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+ strncat strncat-vx strncat-c
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endif
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diff --git a/sysdeps/s390/ifunc-strncat.h b/sysdeps/s390/ifunc-strncat.h
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new file mode 100644
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index 0000000000000000..bb164dcc32905b18
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--- /dev/null
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+++ b/sysdeps/s390/ifunc-strncat.h
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@@ -0,0 +1,52 @@
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+/* strncat 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_STRNCAT_IFUNC 1
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+#else
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+# define HAVE_STRNCAT_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_STRNCAT_IFUNC_AND_VX_SUPPORT HAVE_STRNCAT_IFUNC
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+#else
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+# define HAVE_STRNCAT_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 STRNCAT_DEFAULT STRNCAT_Z13
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+# define HAVE_STRNCAT_C 0
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+# define HAVE_STRNCAT_Z13 1
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+#else
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+# define STRNCAT_DEFAULT STRNCAT_C
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+# define HAVE_STRNCAT_C 1
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+# define HAVE_STRNCAT_Z13 HAVE_STRNCAT_IFUNC_AND_VX_SUPPORT
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+#endif
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+
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+#if HAVE_STRNCAT_C
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+# define STRNCAT_C __strncat_c
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+#else
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+# define STRNCAT_C NULL
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+#endif
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+
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+#if HAVE_STRNCAT_Z13
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+# define STRNCAT_Z13 __strncat_vx
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+#else
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+# define STRNCAT_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 9b66237aaf9eb47e..24be3eac5131fd4a 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 += strncat strncat-vx strncat-c \
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- strcmp strcmp-vx \
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+sysdep_routines += 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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strchrnul strchrnul-vx strchrnul-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 1b7f3df3a3cfe561..3abcaf08e0ccd385 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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@@ -33,6 +33,7 @@
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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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+#include <ifunc-strncat.h>
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/* Maximum number of IFUNC implementations. */
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#define MAX_IFUNC 3
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@@ -255,6 +256,18 @@ __libc_ifunc_impl_list (const char *name, struct libc_ifunc_impl *array,
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)
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#endif /* HAVE_STRCAT_IFUNC */
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+#if HAVE_STRNCAT_IFUNC
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+ IFUNC_IMPL (i, name, strncat,
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+# if HAVE_STRNCAT_Z13
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+ IFUNC_IMPL_ADD (array, i, strncat,
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+ dl_hwcap & HWCAP_S390_VX, STRNCAT_Z13)
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+# endif
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+# if HAVE_STRNCAT_C
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+ IFUNC_IMPL_ADD (array, i, strncat, 1, STRNCAT_C)
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+# endif
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+ )
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+#endif /* HAVE_STRNCAT_IFUNC */
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+
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#ifdef HAVE_S390_VX_ASM_SUPPORT
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# define IFUNC_VX_IMPL(FUNC) \
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@@ -277,7 +290,6 @@ __libc_ifunc_impl_list (const char *name, struct libc_ifunc_impl *array,
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IFUNC_VX_IMPL (wcscat);
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- IFUNC_VX_IMPL (strncat);
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IFUNC_VX_IMPL (wcsncat);
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IFUNC_VX_IMPL (strcmp);
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diff --git a/sysdeps/s390/multiarch/strncat-c.c b/sysdeps/s390/strncat-c.c
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similarity index 86%
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rename from sysdeps/s390/multiarch/strncat-c.c
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rename to sysdeps/s390/strncat-c.c
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index 9e6c245ccbbc2e23..86df89887c7b6293 100644
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--- a/sysdeps/s390/multiarch/strncat-c.c
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+++ b/sysdeps/s390/strncat-c.c
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@@ -16,8 +16,12 @@
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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 STRNCAT __strncat_c
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-# define STRNCAT_PRIMARY
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+#include <ifunc-strncat.h>
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+
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+#if HAVE_STRNCAT_C
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+# if HAVE_STRNCAT_IFUNC
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+# define STRNCAT STRNCAT_C
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+# define STRNCAT_PRIMARY
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+# endif
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# include <string/strncat.c>
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#endif
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diff --git a/sysdeps/s390/multiarch/strncat-vx.S b/sysdeps/s390/strncat-vx.S
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similarity index 94%
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rename from sysdeps/s390/multiarch/strncat-vx.S
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rename to sysdeps/s390/strncat-vx.S
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index e6584d0f438f0e38..76345e7dd702dd85 100644
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--- a/sysdeps/s390/multiarch/strncat-vx.S
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+++ b/sysdeps/s390/strncat-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-strncat.h>
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+#if HAVE_STRNCAT_Z13
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# include "sysdep.h"
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# include "asm-syntax.h"
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@@ -40,7 +41,7 @@
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-v18=part of src
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-v31=register save area for r6, r7
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*/
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-ENTRY(__strncat_vx)
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+ENTRY(STRNCAT_Z13)
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.machine "z13"
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.machinemode "zarch_nohighgprs"
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@@ -235,5 +236,17 @@ ENTRY(__strncat_vx)
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vl %v16,0(%r5,%r3) /* Load s. */
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j .Lcpy_lt64
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-END(__strncat_vx)
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-#endif /* HAVE_S390_VX_ASM_SUPPORT && IS_IN (libc) */
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+END(STRNCAT_Z13)
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+
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+# if ! HAVE_STRNCAT_IFUNC
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+strong_alias (STRNCAT_Z13, strncat)
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+# endif
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+
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+# if ! HAVE_STRNCAT_C
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+/* See string/strncat.c and define STRNCAT_PRIMARY. */
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+strong_alias (STRNCAT_Z13, __strncat)
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+# if defined SHARED && IS_IN (libc)
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+strong_alias (__strncat, __GI___strncat)
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+# endif
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+# endif
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+#endif
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diff --git a/sysdeps/s390/multiarch/strncat.c b/sysdeps/s390/strncat.c
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similarity index 69%
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rename from sysdeps/s390/multiarch/strncat.c
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rename to sysdeps/s390/strncat.c
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index 94b8dffa85420cfa..b4b3656c5ae9c535 100644
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--- a/sysdeps/s390/multiarch/strncat.c
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+++ b/sysdeps/s390/strncat.c
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@@ -16,12 +16,23 @@
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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-strncat.h>
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+
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+#if HAVE_STRNCAT_IFUNC
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# include <string.h>
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# include <ifunc-resolve.h>
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-s390_vx_libc_ifunc2 (__strncat, strncat)
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+# if HAVE_STRNCAT_C
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+extern __typeof (__strncat) STRNCAT_C attribute_hidden;
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+# endif
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+
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+# if HAVE_STRNCAT_Z13
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+extern __typeof (__strncat) STRNCAT_Z13 attribute_hidden;
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+# endif
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-#else
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-# include <string/strncat.c>
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-#endif /* !(defined HAVE_S390_VX_ASM_SUPPORT && IS_IN (libc)) */
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+s390_libc_ifunc_expr (__strncat, strncat,
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+ (HAVE_STRNCAT_Z13 && (hwcap & HWCAP_S390_VX))
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+ ? STRNCAT_Z13
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+ : STRNCAT_DEFAULT
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+ )
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+#endif
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