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glibc/SOURCES/glibc-rh1659438-41.patch

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commit c3081bcbd91a619115f047c2ceea90a9090d5216
Author: Stefan Liebler <stli@linux.ibm.com>
Date: Tue Dec 18 13:57:19 2018 +0100
S390: Refactor wcpncpy ifunc handling.
The ifunc handling for wcpncpy 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 wcpncpy variants.
* sysdeps/s390/Makefile (sysdep_routines): Add wcpncpy variants.
* sysdeps/s390/multiarch/ifunc-impl-list.c
(__libc_ifunc_impl_list): Refactor ifunc handling for wcpncpy.
* sysdeps/s390/multiarch/wcpncpy-c.c: Move to ...
* sysdeps/s390/wcpncpy-c.c: ... here and adjust ifunc handling.
* sysdeps/s390/multiarch/wcpncpy-vx.S: Move to ...
* sysdeps/s390/wcpncpy-vx.S: ... here and adjust ifunc handling.
* sysdeps/s390/multiarch/wcpncpy.c: Move to ...
* sysdeps/s390/wcpncpy.c: ... here and adjust ifunc handling.
* sysdeps/s390/ifunc-wcpncpy.h: New file.
diff --git a/sysdeps/s390/Makefile b/sysdeps/s390/Makefile
index cc8357361e1f2574..640177370382235f 100644
--- a/sysdeps/s390/Makefile
+++ b/sysdeps/s390/Makefile
@@ -64,5 +64,6 @@ sysdep_routines += wcslen wcslen-vx wcslen-c \
wcsnlen wcsnlen-vx wcsnlen-c \
wcscpy wcscpy-vx wcscpy-c \
wcpcpy wcpcpy-vx wcpcpy-c \
- wcsncpy wcsncpy-vx wcsncpy-c
+ wcsncpy wcsncpy-vx wcsncpy-c \
+ wcpncpy wcpncpy-vx wcpncpy-c
endif
diff --git a/sysdeps/s390/ifunc-wcpncpy.h b/sysdeps/s390/ifunc-wcpncpy.h
new file mode 100644
index 0000000000000000..0dd5633aa9cd780b
--- /dev/null
+++ b/sysdeps/s390/ifunc-wcpncpy.h
@@ -0,0 +1,53 @@
+/* wcpncpy 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_WCPNCPY_IFUNC 1
+#else
+# define HAVE_WCPNCPY_IFUNC 0
+#endif
+
+#ifdef HAVE_S390_VX_ASM_SUPPORT
+# define HAVE_WCPNCPY_IFUNC_AND_VX_SUPPORT HAVE_WCPNCPY_IFUNC
+#else
+# define HAVE_WCPNCPY_IFUNC_AND_VX_SUPPORT 0
+#endif
+
+#if defined HAVE_S390_MIN_Z13_ZARCH_ASM_SUPPORT
+# define WCPNCPY_DEFAULT WCPNCPY_Z13
+/* The z13 ifunc variant is using the common code variant as fallback! */
+# define HAVE_WCPNCPY_C 1
+# define HAVE_WCPNCPY_Z13 1
+#else
+# define WCPNCPY_DEFAULT WCPNCPY_C
+# define HAVE_WCPNCPY_C 1
+# define HAVE_WCPNCPY_Z13 HAVE_WCPNCPY_IFUNC_AND_VX_SUPPORT
+#endif
+
+#if HAVE_WCPNCPY_C
+# define WCPNCPY_C __wcpncpy_c
+#else
+# define WCPNCPY_C NULL
+#endif
+
+#if HAVE_WCPNCPY_Z13
+# define WCPNCPY_Z13 __wcpncpy_vx
+#else
+# define WCPNCPY_Z13 NULL
+#endif
diff --git a/sysdeps/s390/multiarch/Makefile b/sysdeps/s390/multiarch/Makefile
index 6631fd14d32fde72..158fb495523438b4 100644
--- a/sysdeps/s390/multiarch/Makefile
+++ b/sysdeps/s390/multiarch/Makefile
@@ -1,6 +1,5 @@
ifeq ($(subdir),wcsmbs)
-sysdep_routines += wcpncpy wcpncpy-vx wcpncpy-c \
- wcscat wcscat-vx wcscat-c \
+sysdep_routines += wcscat wcscat-vx wcscat-c \
wcsncat wcsncat-vx wcsncat-c \
wcscmp wcscmp-vx wcscmp-c \
wcsncmp wcsncmp-vx wcsncmp-c \
diff --git a/sysdeps/s390/multiarch/ifunc-impl-list.c b/sysdeps/s390/multiarch/ifunc-impl-list.c
index 9ebaf4de6f2eb841..e60238fcde4dcd4f 100644
--- a/sysdeps/s390/multiarch/ifunc-impl-list.c
+++ b/sysdeps/s390/multiarch/ifunc-impl-list.c
@@ -51,6 +51,7 @@
#include <ifunc-wcscpy.h>
#include <ifunc-wcpcpy.h>
#include <ifunc-wcsncpy.h>
+#include <ifunc-wcpncpy.h>
/* Maximum number of IFUNC implementations. */
#define MAX_IFUNC 3
@@ -489,6 +490,18 @@ __libc_ifunc_impl_list (const char *name, struct libc_ifunc_impl *array,
)
#endif /* HAVE_WCSNCPY_IFUNC */
+#if HAVE_WCPNCPY_IFUNC
+ IFUNC_IMPL (i, name, wcpncpy,
+# if HAVE_WCPNCPY_Z13
+ IFUNC_IMPL_ADD (array, i, wcpncpy,
+ dl_hwcap & HWCAP_S390_VX, WCPNCPY_Z13)
+# endif
+# if HAVE_WCPNCPY_C
+ IFUNC_IMPL_ADD (array, i, wcpncpy, 1, WCPNCPY_C)
+# endif
+ )
+#endif /* HAVE_WCPNCPY_IFUNC */
+
#ifdef HAVE_S390_VX_ASM_SUPPORT
# define IFUNC_VX_IMPL(FUNC) \
@@ -497,8 +510,6 @@ __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 (wcpncpy);
-
IFUNC_VX_IMPL (wcscat);
IFUNC_VX_IMPL (wcsncat);
diff --git a/sysdeps/s390/multiarch/wcpncpy-c.c b/sysdeps/s390/wcpncpy-c.c
similarity index 85%
rename from sysdeps/s390/multiarch/wcpncpy-c.c
rename to sysdeps/s390/wcpncpy-c.c
index 1f44bacea9b65d44..d03359217e98a1f3 100644
--- a/sysdeps/s390/multiarch/wcpncpy-c.c
+++ b/sysdeps/s390/wcpncpy-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 WCPNCPY __wcpncpy_c
+#include <ifunc-wcpncpy.h>
+
+#if HAVE_WCPNCPY_C
+# if HAVE_WCPNCPY_IFUNC || HAVE_WCPNCPY_Z13
+# define WCPNCPY WCPNCPY_C
+# endif
-# include <wchar.h>
-extern __typeof (__wcpncpy) __wcpncpy_c;
# include <wcsmbs/wcpncpy.c>
#endif
diff --git a/sysdeps/s390/multiarch/wcpncpy-vx.S b/sysdeps/s390/wcpncpy-vx.S
similarity index 97%
rename from sysdeps/s390/multiarch/wcpncpy-vx.S
rename to sysdeps/s390/wcpncpy-vx.S
index 004f512e1f1a7982..7b5e4ad32d42d44b 100644
--- a/sysdeps/s390/multiarch/wcpncpy-vx.S
+++ b/sysdeps/s390/wcpncpy-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-wcpncpy.h>
+#if HAVE_WCPNCPY_Z13
# include "sysdep.h"
# include "asm-syntax.h"
@@ -38,7 +39,7 @@
-%r6 = loaded bytes
-%r7 = border, tmp
*/
-ENTRY(__wcpncpy_vx)
+ENTRY(WCPNCPY_Z13)
.machine "z13"
.machinemode "zarch_nohighgprs"
@@ -217,6 +218,11 @@ ENTRY(__wcpncpy_vx)
j .Llt64
.Lfallback:
- jg __wcpncpy_c
-END(__wcpncpy_vx)
-#endif /* HAVE_S390_VX_ASM_SUPPORT && IS_IN (libc) */
+ jg WCPNCPY_C
+END(WCPNCPY_Z13)
+
+# if ! HAVE_WCPNCPY_IFUNC
+strong_alias (WCPNCPY_Z13, __wcpncpy)
+weak_alias (__wcpncpy, wcpncpy)
+# endif
+#endif
diff --git a/sysdeps/s390/multiarch/wcpncpy.c b/sysdeps/s390/wcpncpy.c
similarity index 70%
rename from sysdeps/s390/multiarch/wcpncpy.c
rename to sysdeps/s390/wcpncpy.c
index b72265fbe9df65d0..08d097dd2cb6dfd7 100644
--- a/sysdeps/s390/multiarch/wcpncpy.c
+++ b/sysdeps/s390/wcpncpy.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-wcpncpy.h>
+
+#if HAVE_WCPNCPY_IFUNC
# include <wchar.h>
# include <ifunc-resolve.h>
-s390_vx_libc_ifunc (__wcpncpy)
-weak_alias (__wcpncpy, wcpncpy)
+# if HAVE_WCPNCPY_C
+extern __typeof (__wcpncpy) WCPNCPY_C attribute_hidden;
+# endif
-#else
-# include <wcsmbs/wcpncpy.c>
-#endif /* !(defined HAVE_S390_VX_ASM_SUPPORT && IS_IN (libc)) */
+# if HAVE_WCPNCPY_Z13
+extern __typeof (__wcpncpy) WCPNCPY_Z13 attribute_hidden;
+# endif
+
+s390_libc_ifunc_expr (__wcpncpy, __wcpncpy,
+ (HAVE_WCPNCPY_Z13 && (hwcap & HWCAP_S390_VX))
+ ? WCPNCPY_Z13
+ : WCPNCPY_DEFAULT
+ )
+weak_alias (__wcpncpy, wcpncpy)
+#endif
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