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commit c7e7cd266ed123b6dfb722f599934ca5dcfd3e93
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Author: Stefan Liebler <stli@linux.ibm.com>
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Date: Tue Dec 18 13:57:18 2018 +0100
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S390: Refactor wcsnlen ifunc handling.
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The ifunc handling for wcsnlen is adjusted in order to omit ifunc
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if the minimum architecture level already supports newer CPUs by default.
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Unfortunately the c ifunc variant can't be omitted at all as it is used
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by the z13 ifunc variant as fallback if the pointers are not 4-byte aligned.
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Glibc internal calls will 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 wcsnlen variants.
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* sysdeps/s390/Makefile (sysdep_routines): Add wcsnlen variants.
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* sysdeps/s390/multiarch/ifunc-impl-list.c
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(__libc_ifunc_impl_list): Refactor ifunc handling for wcsnlen.
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* sysdeps/s390/multiarch/wcsnlen-c.c: Move to ...
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* sysdeps/s390/wcsnlen-c.c: ... here and adjust ifunc handling.
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* sysdeps/s390/multiarch/wcsnlen-vx.S: Move to ...
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* sysdeps/s390/wcsnlen-vx.S: ... here and adjust ifunc handling.
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* sysdeps/s390/multiarch/wcsnlen.c: Move to ...
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* sysdeps/s390/wcsnlen.c: ... here and adjust ifunc handling.
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* sysdeps/s390/ifunc-wcsnlen.h: New file.
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diff --git a/sysdeps/s390/Makefile b/sysdeps/s390/Makefile
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index 65e89118936bb668..f5983815479a76da 100644
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--- a/sysdeps/s390/Makefile
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+++ b/sysdeps/s390/Makefile
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@@ -60,5 +60,6 @@ sysdep_routines += bzero memset memset-z900 \
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endif
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ifeq ($(subdir),wcsmbs)
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-sysdep_routines += wcslen wcslen-vx wcslen-c
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+sysdep_routines += wcslen wcslen-vx wcslen-c \
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+ wcsnlen wcsnlen-vx wcsnlen-c
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endif
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diff --git a/sysdeps/s390/ifunc-wcsnlen.h b/sysdeps/s390/ifunc-wcsnlen.h
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new file mode 100644
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index 0000000000000000..b5b21da2f17d9cd9
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--- /dev/null
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+++ b/sysdeps/s390/ifunc-wcsnlen.h
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@@ -0,0 +1,53 @@
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+/* wcsnlen 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_WCSNLEN_IFUNC 1
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+#else
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+# define HAVE_WCSNLEN_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_WCSNLEN_IFUNC_AND_VX_SUPPORT HAVE_WCSNLEN_IFUNC
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+#else
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+# define HAVE_WCSNLEN_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 WCSNLEN_DEFAULT WCSNLEN_Z13
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+/* The z13 ifunc variant is using the common code variant as fallback! */
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+# define HAVE_WCSNLEN_C 1
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+# define HAVE_WCSNLEN_Z13 1
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+#else
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+# define WCSNLEN_DEFAULT WCSNLEN_C
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+# define HAVE_WCSNLEN_C 1
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+# define HAVE_WCSNLEN_Z13 HAVE_WCSNLEN_IFUNC_AND_VX_SUPPORT
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+#endif
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+
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+#if HAVE_WCSNLEN_C
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+# define WCSNLEN_C __wcsnlen_c
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+#else
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+# define WCSNLEN_C NULL
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+#endif
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+
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+#if HAVE_WCSNLEN_Z13
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+# define WCSNLEN_Z13 __wcsnlen_vx
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+#else
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+# define WCSNLEN_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 421d40d020b81560..ce2e7ce5f4eef0fa 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),wcsmbs)
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-sysdep_routines += wcsnlen wcsnlen-vx wcsnlen-c \
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- wcscpy wcscpy-vx wcscpy-c \
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+sysdep_routines += wcscpy wcscpy-vx wcscpy-c \
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wcpcpy wcpcpy-vx wcpcpy-c \
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wcsncpy wcsncpy-vx wcsncpy-c \
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wcpncpy wcpncpy-vx wcpncpy-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 7bf5f14c015b54fe..c199fd0e0b43e4b4 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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@@ -47,6 +47,7 @@
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#include <ifunc-memccpy.h>
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#include <ifunc-memrchr.h>
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#include <ifunc-wcslen.h>
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+#include <ifunc-wcsnlen.h>
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/* Maximum number of IFUNC implementations. */
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#define MAX_IFUNC 3
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@@ -437,6 +438,18 @@ __libc_ifunc_impl_list (const char *name, struct libc_ifunc_impl *array,
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)
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#endif /* HAVE_WCSLEN_IFUNC */
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+#if HAVE_WCSNLEN_IFUNC
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+ IFUNC_IMPL (i, name, wcsnlen,
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+# if HAVE_WCSNLEN_Z13
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+ IFUNC_IMPL_ADD (array, i, wcsnlen,
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+ dl_hwcap & HWCAP_S390_VX, WCSNLEN_Z13)
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+# endif
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+# if HAVE_WCSNLEN_C
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+ IFUNC_IMPL_ADD (array, i, wcsnlen, 1, WCSNLEN_C)
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+# endif
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+ )
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+#endif /* HAVE_WCSNLEN_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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@@ -445,8 +458,6 @@ __libc_ifunc_impl_list (const char *name, struct libc_ifunc_impl *array,
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__##FUNC##_vx) \
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IFUNC_IMPL_ADD (array, i, FUNC, 1, __##FUNC##_c))
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- IFUNC_VX_IMPL (wcsnlen);
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-
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IFUNC_VX_IMPL (wcscpy);
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IFUNC_VX_IMPL (wcpcpy);
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diff --git a/sysdeps/s390/multiarch/wcsnlen-c.c b/sysdeps/s390/wcsnlen-c.c
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similarity index 85%
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rename from sysdeps/s390/multiarch/wcsnlen-c.c
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rename to sysdeps/s390/wcsnlen-c.c
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index 8f43f5104f2eab3f..7495a6f97cfeca62 100644
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--- a/sysdeps/s390/multiarch/wcsnlen-c.c
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+++ b/sysdeps/s390/wcsnlen-c.c
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@@ -16,10 +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 WCSNLEN __wcsnlen_c
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+#include <ifunc-wcsnlen.h>
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+
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+#if HAVE_WCSNLEN_C
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+# if HAVE_WCSNLEN_IFUNC || HAVE_WCSNLEN_Z13
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+# define WCSNLEN WCSNLEN_C
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+# endif
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-# include <wchar.h>
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-extern __typeof (__wcsnlen) __wcsnlen_c;
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# include <wcsmbs/wcsnlen.c>
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#endif
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diff --git a/sysdeps/s390/multiarch/wcsnlen-vx.S b/sysdeps/s390/wcsnlen-vx.S
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similarity index 95%
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rename from sysdeps/s390/multiarch/wcsnlen-vx.S
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rename to sysdeps/s390/wcsnlen-vx.S
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index 420f29fbc0d2965a..47f4ca82840538d9 100644
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--- a/sysdeps/s390/multiarch/wcsnlen-vx.S
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+++ b/sysdeps/s390/wcsnlen-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-wcsnlen.h>
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+#if HAVE_WCSNLEN_Z13
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# include "sysdep.h"
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# include "asm-syntax.h"
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@@ -34,7 +35,7 @@
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-r5=current_len and return_value
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-v16=part of s
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*/
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-ENTRY(__wcsnlen_vx)
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+ENTRY(WCSNLEN_Z13)
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.machine "z13"
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.machinemode "zarch_nohighgprs"
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@@ -146,6 +147,11 @@ ENTRY(__wcsnlen_vx)
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j .Llt64
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.Lfallback:
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- jg __wcsnlen_c
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-END(__wcsnlen_vx)
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-#endif /* HAVE_S390_VX_ASM_SUPPORT && IS_IN (libc) */
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+ jg WCSNLEN_C
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+END(WCSNLEN_Z13)
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+
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+# if ! HAVE_WCSNLEN_IFUNC
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+strong_alias (WCSNLEN_Z13, __wcsnlen)
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+weak_alias (__wcsnlen, wcsnlen)
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+# endif
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+#endif
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diff --git a/sysdeps/s390/multiarch/wcsnlen.c b/sysdeps/s390/wcsnlen.c
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similarity index 70%
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rename from sysdeps/s390/multiarch/wcsnlen.c
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rename to sysdeps/s390/wcsnlen.c
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index 5234074b1fce8ca1..b5c8ad9fde5a9752 100644
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--- a/sysdeps/s390/multiarch/wcsnlen.c
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+++ b/sysdeps/s390/wcsnlen.c
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@@ -16,13 +16,24 @@
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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-wcsnlen.h>
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+
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+#if HAVE_WCSNLEN_IFUNC
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# include <wchar.h>
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# include <ifunc-resolve.h>
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-s390_vx_libc_ifunc (__wcsnlen)
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-weak_alias (__wcsnlen, wcsnlen)
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+# if HAVE_WCSNLEN_C
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+extern __typeof (__wcsnlen) WCSNLEN_C attribute_hidden;
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+# endif
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-#else
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-# include <wcsmbs/wcsnlen.c>
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-#endif /* !(defined HAVE_S390_VX_ASM_SUPPORT && IS_IN (libc)) */
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+# if HAVE_WCSNLEN_Z13
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+extern __typeof (__wcsnlen) WCSNLEN_Z13 attribute_hidden;
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+# endif
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+
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+s390_libc_ifunc_expr (__wcsnlen, __wcsnlen,
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+ (HAVE_WCSNLEN_Z13 && (hwcap & HWCAP_S390_VX))
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+ ? WCSNLEN_Z13
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+ : WCSNLEN_DEFAULT
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+ )
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+weak_alias (__wcsnlen, wcsnlen)
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+#endif
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