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commit 0966dd86896d7cd6c107c751ba7d3b69542ca11d
Author: Stefan Liebler <stli@linux.ibm.com>
Date: Tue Dec 18 13:57:19 2018 +0100
S390: Refactor wcsncpy ifunc handling.
The ifunc handling for wcsncpy is adjusted in order to omit ifunc
if the minimum architecture level already supports newer CPUs by default.
Unfortunately the c ifunc variant can't be omitted at all as it is used
by the z13 ifunc variant as fallback if the pointers are not 4-byte aligned.
ChangeLog:
* sysdeps/s390/multiarch/Makefile
(sysdep_routines): Remove wcsncpy variants.
* sysdeps/s390/Makefile (sysdep_routines): Add wcsncpy variants.
* sysdeps/s390/multiarch/ifunc-impl-list.c
(__libc_ifunc_impl_list): Refactor ifunc handling for wcsncpy.
* sysdeps/s390/multiarch/wcsncpy-c.c: Move to ...
* sysdeps/s390/wcsncpy-c.c: ... here and adjust ifunc handling.
* sysdeps/s390/multiarch/wcsncpy-vx.S: Move to ...
* sysdeps/s390/wcsncpy-vx.S: ... here and adjust ifunc handling.
* sysdeps/s390/multiarch/wcsncpy.c: Move to ...
* sysdeps/s390/wcsncpy.c: ... here and adjust ifunc handling.
* sysdeps/s390/ifunc-wcsncpy.h: New file.
diff --git a/sysdeps/s390/Makefile b/sysdeps/s390/Makefile
index 5b6446f55299af03..cc8357361e1f2574 100644
--- a/sysdeps/s390/Makefile
+++ b/sysdeps/s390/Makefile
@@ -63,5 +63,6 @@ ifeq ($(subdir),wcsmbs)
sysdep_routines += wcslen wcslen-vx wcslen-c \
wcsnlen wcsnlen-vx wcsnlen-c \
wcscpy wcscpy-vx wcscpy-c \
- wcpcpy wcpcpy-vx wcpcpy-c
+ wcpcpy wcpcpy-vx wcpcpy-c \
+ wcsncpy wcsncpy-vx wcsncpy-c
endif
diff --git a/sysdeps/s390/ifunc-wcsncpy.h b/sysdeps/s390/ifunc-wcsncpy.h
new file mode 100644
index 0000000000000000..d7beca128aaaebc8
--- /dev/null
+++ b/sysdeps/s390/ifunc-wcsncpy.h
@@ -0,0 +1,53 @@
+/* wcsncpy 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_WCSNCPY_IFUNC 1
+#else
+# define HAVE_WCSNCPY_IFUNC 0
+#endif
+
+#ifdef HAVE_S390_VX_ASM_SUPPORT
+# define HAVE_WCSNCPY_IFUNC_AND_VX_SUPPORT HAVE_WCSNCPY_IFUNC
+#else
+# define HAVE_WCSNCPY_IFUNC_AND_VX_SUPPORT 0
+#endif
+
+#if defined HAVE_S390_MIN_Z13_ZARCH_ASM_SUPPORT
+# define WCSNCPY_DEFAULT WCSNCPY_Z13
+/* The z13 ifunc variant is using the common code variant as fallback! */
+# define HAVE_WCSNCPY_C 1
+# define HAVE_WCSNCPY_Z13 1
+#else
+# define WCSNCPY_DEFAULT WCSNCPY_C
+# define HAVE_WCSNCPY_C 1
+# define HAVE_WCSNCPY_Z13 HAVE_WCSNCPY_IFUNC_AND_VX_SUPPORT
+#endif
+
+#if HAVE_WCSNCPY_C
+# define WCSNCPY_C __wcsncpy_c
+#else
+# define WCSNCPY_C NULL
+#endif
+
+#if HAVE_WCSNCPY_Z13
+# define WCSNCPY_Z13 __wcsncpy_vx
+#else
+# define WCSNCPY_Z13 NULL
+#endif
diff --git a/sysdeps/s390/multiarch/Makefile b/sysdeps/s390/multiarch/Makefile
index 7d7b05dcf21cff7d..6631fd14d32fde72 100644
--- a/sysdeps/s390/multiarch/Makefile
+++ b/sysdeps/s390/multiarch/Makefile
@@ -1,6 +1,5 @@
ifeq ($(subdir),wcsmbs)
-sysdep_routines += wcsncpy wcsncpy-vx wcsncpy-c \
- wcpncpy wcpncpy-vx wcpncpy-c \
+sysdep_routines += wcpncpy wcpncpy-vx wcpncpy-c \
wcscat wcscat-vx wcscat-c \
wcsncat wcsncat-vx wcsncat-c \
wcscmp wcscmp-vx wcscmp-c \
diff --git a/sysdeps/s390/multiarch/ifunc-impl-list.c b/sysdeps/s390/multiarch/ifunc-impl-list.c
index 656ab59db66dbb48..9ebaf4de6f2eb841 100644
--- a/sysdeps/s390/multiarch/ifunc-impl-list.c
+++ b/sysdeps/s390/multiarch/ifunc-impl-list.c
@@ -50,6 +50,7 @@
#include <ifunc-wcsnlen.h>
#include <ifunc-wcscpy.h>
#include <ifunc-wcpcpy.h>
+#include <ifunc-wcsncpy.h>
/* Maximum number of IFUNC implementations. */
#define MAX_IFUNC 3
@@ -476,6 +477,18 @@ __libc_ifunc_impl_list (const char *name, struct libc_ifunc_impl *array,
)
#endif /* HAVE_WCPCPY_IFUNC */
+#if HAVE_WCSNCPY_IFUNC
+ IFUNC_IMPL (i, name, wcsncpy,
+# if HAVE_WCSNCPY_Z13
+ IFUNC_IMPL_ADD (array, i, wcsncpy,
+ dl_hwcap & HWCAP_S390_VX, WCSNCPY_Z13)
+# endif
+# if HAVE_WCSNCPY_C
+ IFUNC_IMPL_ADD (array, i, wcsncpy, 1, WCSNCPY_C)
+# endif
+ )
+#endif /* HAVE_WCSNCPY_IFUNC */
+
#ifdef HAVE_S390_VX_ASM_SUPPORT
# define IFUNC_VX_IMPL(FUNC) \
@@ -484,8 +497,6 @@ __libc_ifunc_impl_list (const char *name, struct libc_ifunc_impl *array,
__##FUNC##_vx) \
IFUNC_IMPL_ADD (array, i, FUNC, 1, __##FUNC##_c))
- IFUNC_VX_IMPL (wcsncpy);
-
IFUNC_VX_IMPL (wcpncpy);
IFUNC_VX_IMPL (wcscat);
diff --git a/sysdeps/s390/multiarch/wcsncpy-c.c b/sysdeps/s390/wcsncpy-c.c
similarity index 85%
rename from sysdeps/s390/multiarch/wcsncpy-c.c
rename to sysdeps/s390/wcsncpy-c.c
index 6b89b8c14bf58198..4d0ddb09ecb1c849 100644
--- a/sysdeps/s390/multiarch/wcsncpy-c.c
+++ b/sysdeps/s390/wcsncpy-c.c
@@ -16,10 +16,12 @@
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 WCSNCPY __wcsncpy_c
+#include <ifunc-wcsncpy.h>
+
+#if HAVE_WCSNCPY_C
+# if HAVE_WCSNCPY_IFUNC || HAVE_WCSNCPY_Z13
+# define WCSNCPY WCSNCPY_C
+# endif
-# include <wchar.h>
-extern __typeof (__wcsncpy) __wcsncpy_c;
# include <wcsmbs/wcsncpy.c>
#endif
diff --git a/sysdeps/s390/multiarch/wcsncpy-vx.S b/sysdeps/s390/wcsncpy-vx.S
similarity index 97%
rename from sysdeps/s390/multiarch/wcsncpy-vx.S
rename to sysdeps/s390/wcsncpy-vx.S
index b3400d50d9ab3324..9bcbdbf3229033da 100644
--- a/sysdeps/s390/multiarch/wcsncpy-vx.S
+++ b/sysdeps/s390/wcsncpy-vx.S
@@ -16,7 +16,8 @@
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-wcsncpy.h>
+#if HAVE_WCSNCPY_Z13
# include "sysdep.h"
# include "asm-syntax.h"
@@ -40,7 +41,7 @@
-v18=part of src
-v31=register save area for r6, r7
*/
-ENTRY(__wcsncpy_vx)
+ENTRY(WCSNCPY_Z13)
.machine "z13"
.machinemode "zarch_nohighgprs"
@@ -217,7 +218,11 @@ ENTRY(__wcsncpy_vx)
j .Llt64
.Lfallback:
- jg __wcsncpy_c
-END(__wcsncpy_vx)
-
-#endif /* HAVE_S390_VX_ASM_SUPPORT && IS_IN (libc) */
+ jg WCSNCPY_C
+END(WCSNCPY_Z13)
+
+# if ! HAVE_WCSNCPY_IFUNC
+strong_alias (WCSNCPY_Z13, __wcsncpy)
+weak_alias (__wcsncpy, wcsncpy)
+# endif
+#endif
diff --git a/sysdeps/s390/multiarch/wcsncpy.c b/sysdeps/s390/wcsncpy.c
similarity index 70%
rename from sysdeps/s390/multiarch/wcsncpy.c
rename to sysdeps/s390/wcsncpy.c
index 7209c7d4310d6013..e011de7ee7652bec 100644
--- a/sysdeps/s390/multiarch/wcsncpy.c
+++ b/sysdeps/s390/wcsncpy.c
@@ -16,13 +16,24 @@
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-wcsncpy.h>
+
+#if HAVE_WCSNCPY_IFUNC
# include <wchar.h>
# include <ifunc-resolve.h>
-s390_vx_libc_ifunc (__wcsncpy)
-weak_alias (__wcsncpy, wcsncpy)
+# if HAVE_WCSNCPY_C
+extern __typeof (__wcsncpy) WCSNCPY_C attribute_hidden;
+# endif
-#else
-# include <wcsmbs/wcsncpy.c>
-#endif /* !(defined HAVE_S390_VX_ASM_SUPPORT && IS_IN (libc)) */
+# if HAVE_WCSNCPY_Z13
+extern __typeof (__wcsncpy) WCSNCPY_Z13 attribute_hidden;
+# endif
+
+s390_libc_ifunc_expr (__wcsncpy, __wcsncpy,
+ (HAVE_WCSNCPY_Z13 && (hwcap & HWCAP_S390_VX))
+ ? WCSNCPY_Z13
+ : WCSNCPY_DEFAULT
+ )
+weak_alias (__wcsncpy, wcsncpy)
+#endif
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