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commit 0966dd86896d7cd6c107c751ba7d3b69542ca11d
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Author: Stefan Liebler <stli@linux.ibm.com>
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Date: Tue Dec 18 13:57:19 2018 +0100
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S390: Refactor wcsncpy ifunc handling.
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The ifunc handling for wcsncpy 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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ChangeLog:
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* sysdeps/s390/multiarch/Makefile
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(sysdep_routines): Remove wcsncpy variants.
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* sysdeps/s390/Makefile (sysdep_routines): Add wcsncpy variants.
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* sysdeps/s390/multiarch/ifunc-impl-list.c
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(__libc_ifunc_impl_list): Refactor ifunc handling for wcsncpy.
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* sysdeps/s390/multiarch/wcsncpy-c.c: Move to ...
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* sysdeps/s390/wcsncpy-c.c: ... here and adjust ifunc handling.
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* sysdeps/s390/multiarch/wcsncpy-vx.S: Move to ...
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* sysdeps/s390/wcsncpy-vx.S: ... here and adjust ifunc handling.
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* sysdeps/s390/multiarch/wcsncpy.c: Move to ...
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* sysdeps/s390/wcsncpy.c: ... here and adjust ifunc handling.
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* sysdeps/s390/ifunc-wcsncpy.h: New file.
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diff --git a/sysdeps/s390/Makefile b/sysdeps/s390/Makefile
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index 5b6446f55299af03..cc8357361e1f2574 100644
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--- a/sysdeps/s390/Makefile
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+++ b/sysdeps/s390/Makefile
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@@ -63,5 +63,6 @@ ifeq ($(subdir),wcsmbs)
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sysdep_routines += wcslen wcslen-vx wcslen-c \
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wcsnlen wcsnlen-vx wcsnlen-c \
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wcscpy wcscpy-vx wcscpy-c \
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- wcpcpy wcpcpy-vx wcpcpy-c
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+ wcpcpy wcpcpy-vx wcpcpy-c \
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+ wcsncpy wcsncpy-vx wcsncpy-c
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endif
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diff --git a/sysdeps/s390/ifunc-wcsncpy.h b/sysdeps/s390/ifunc-wcsncpy.h
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new file mode 100644
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index 0000000000000000..d7beca128aaaebc8
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--- /dev/null
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+++ b/sysdeps/s390/ifunc-wcsncpy.h
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@@ -0,0 +1,53 @@
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+/* wcsncpy 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_WCSNCPY_IFUNC 1
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+#else
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+# define HAVE_WCSNCPY_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_WCSNCPY_IFUNC_AND_VX_SUPPORT HAVE_WCSNCPY_IFUNC
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+#else
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+# define HAVE_WCSNCPY_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 WCSNCPY_DEFAULT WCSNCPY_Z13
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+/* The z13 ifunc variant is using the common code variant as fallback! */
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+# define HAVE_WCSNCPY_C 1
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+# define HAVE_WCSNCPY_Z13 1
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+#else
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+# define WCSNCPY_DEFAULT WCSNCPY_C
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+# define HAVE_WCSNCPY_C 1
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+# define HAVE_WCSNCPY_Z13 HAVE_WCSNCPY_IFUNC_AND_VX_SUPPORT
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+#endif
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+
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+#if HAVE_WCSNCPY_C
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+# define WCSNCPY_C __wcsncpy_c
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+#else
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+# define WCSNCPY_C NULL
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+#endif
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+
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+#if HAVE_WCSNCPY_Z13
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+# define WCSNCPY_Z13 __wcsncpy_vx
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+#else
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+# define WCSNCPY_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 7d7b05dcf21cff7d..6631fd14d32fde72 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 += wcsncpy wcsncpy-vx wcsncpy-c \
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- wcpncpy wcpncpy-vx wcpncpy-c \
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+sysdep_routines += wcpncpy wcpncpy-vx wcpncpy-c \
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wcscat wcscat-vx wcscat-c \
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wcsncat wcsncat-vx wcsncat-c \
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wcscmp wcscmp-vx wcscmp-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 656ab59db66dbb48..9ebaf4de6f2eb841 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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@@ -50,6 +50,7 @@
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#include <ifunc-wcsnlen.h>
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#include <ifunc-wcscpy.h>
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#include <ifunc-wcpcpy.h>
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+#include <ifunc-wcsncpy.h>
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/* Maximum number of IFUNC implementations. */
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#define MAX_IFUNC 3
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@@ -476,6 +477,18 @@ __libc_ifunc_impl_list (const char *name, struct libc_ifunc_impl *array,
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)
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#endif /* HAVE_WCPCPY_IFUNC */
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+#if HAVE_WCSNCPY_IFUNC
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+ IFUNC_IMPL (i, name, wcsncpy,
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+# if HAVE_WCSNCPY_Z13
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+ IFUNC_IMPL_ADD (array, i, wcsncpy,
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+ dl_hwcap & HWCAP_S390_VX, WCSNCPY_Z13)
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+# endif
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+# if HAVE_WCSNCPY_C
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+ IFUNC_IMPL_ADD (array, i, wcsncpy, 1, WCSNCPY_C)
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+# endif
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+ )
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+#endif /* HAVE_WCSNCPY_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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@@ -484,8 +497,6 @@ __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 (wcsncpy);
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-
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IFUNC_VX_IMPL (wcpncpy);
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IFUNC_VX_IMPL (wcscat);
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diff --git a/sysdeps/s390/multiarch/wcsncpy-c.c b/sysdeps/s390/wcsncpy-c.c
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similarity index 85%
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rename from sysdeps/s390/multiarch/wcsncpy-c.c
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rename to sysdeps/s390/wcsncpy-c.c
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index 6b89b8c14bf58198..4d0ddb09ecb1c849 100644
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--- a/sysdeps/s390/multiarch/wcsncpy-c.c
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+++ b/sysdeps/s390/wcsncpy-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 WCSNCPY __wcsncpy_c
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+#include <ifunc-wcsncpy.h>
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+
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+#if HAVE_WCSNCPY_C
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+# if HAVE_WCSNCPY_IFUNC || HAVE_WCSNCPY_Z13
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+# define WCSNCPY WCSNCPY_C
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+# endif
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-# include <wchar.h>
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-extern __typeof (__wcsncpy) __wcsncpy_c;
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# include <wcsmbs/wcsncpy.c>
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#endif
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diff --git a/sysdeps/s390/multiarch/wcsncpy-vx.S b/sysdeps/s390/wcsncpy-vx.S
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similarity index 97%
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rename from sysdeps/s390/multiarch/wcsncpy-vx.S
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rename to sysdeps/s390/wcsncpy-vx.S
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index b3400d50d9ab3324..9bcbdbf3229033da 100644
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--- a/sysdeps/s390/multiarch/wcsncpy-vx.S
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+++ b/sysdeps/s390/wcsncpy-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-wcsncpy.h>
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+#if HAVE_WCSNCPY_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(__wcsncpy_vx)
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+ENTRY(WCSNCPY_Z13)
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.machine "z13"
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.machinemode "zarch_nohighgprs"
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@@ -217,7 +218,11 @@ ENTRY(__wcsncpy_vx)
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j .Llt64
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.Lfallback:
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- jg __wcsncpy_c
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-END(__wcsncpy_vx)
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-
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-#endif /* HAVE_S390_VX_ASM_SUPPORT && IS_IN (libc) */
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+ jg WCSNCPY_C
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+END(WCSNCPY_Z13)
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+
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+# if ! HAVE_WCSNCPY_IFUNC
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+strong_alias (WCSNCPY_Z13, __wcsncpy)
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+weak_alias (__wcsncpy, wcsncpy)
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+# endif
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+#endif
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diff --git a/sysdeps/s390/multiarch/wcsncpy.c b/sysdeps/s390/wcsncpy.c
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similarity index 70%
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rename from sysdeps/s390/multiarch/wcsncpy.c
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rename to sysdeps/s390/wcsncpy.c
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index 7209c7d4310d6013..e011de7ee7652bec 100644
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--- a/sysdeps/s390/multiarch/wcsncpy.c
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+++ b/sysdeps/s390/wcsncpy.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-wcsncpy.h>
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+
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+#if HAVE_WCSNCPY_IFUNC
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# include <wchar.h>
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# include <ifunc-resolve.h>
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-s390_vx_libc_ifunc (__wcsncpy)
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-weak_alias (__wcsncpy, wcsncpy)
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+# if HAVE_WCSNCPY_C
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+extern __typeof (__wcsncpy) WCSNCPY_C attribute_hidden;
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+# endif
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-#else
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-# include <wcsmbs/wcsncpy.c>
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-#endif /* !(defined HAVE_S390_VX_ASM_SUPPORT && IS_IN (libc)) */
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+# if HAVE_WCSNCPY_Z13
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+extern __typeof (__wcsncpy) WCSNCPY_Z13 attribute_hidden;
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+# endif
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+
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+s390_libc_ifunc_expr (__wcsncpy, __wcsncpy,
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+ (HAVE_WCSNCPY_Z13 && (hwcap & HWCAP_S390_VX))
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+ ? WCSNCPY_Z13
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+ : WCSNCPY_DEFAULT
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+ )
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+weak_alias (__wcsncpy, wcsncpy)
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+#endif
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