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glibc/glibc-rh1659438-39.patch

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commit 0582e4284529b4ea0fcd1a8973ccab7d95ec0e87
Author: Stefan Liebler <stli@linux.ibm.com>
Date: Tue Dec 18 13:57:19 2018 +0100
S390: Refactor wcpcpy ifunc handling.
The ifunc handling for wcpcpy 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 wcpcpy variants.
* sysdeps/s390/Makefile (sysdep_routines): Add wcpcpy variants.
* sysdeps/s390/multiarch/ifunc-impl-list.c
(__libc_ifunc_impl_list): Refactor ifunc handling for wcpcpy.
* sysdeps/s390/multiarch/wcpcpy-c.c: Move to ...
* sysdeps/s390/wcpcpy-c.c: ... here and adjust ifunc handling.
* sysdeps/s390/multiarch/wcpcpy-vx.S: Move to ...
* sysdeps/s390/wcpcpy-vx.S: ... here and adjust ifunc handling.
* sysdeps/s390/multiarch/wcpcpy.c: Move to ...
* sysdeps/s390/wcpcpy.c: ... here and adjust ifunc handling.
* sysdeps/s390/ifunc-wcpcpy.h: New file.
diff --git a/sysdeps/s390/Makefile b/sysdeps/s390/Makefile
index 8bdbd1b5d8e9df01..5b6446f55299af03 100644
--- a/sysdeps/s390/Makefile
+++ b/sysdeps/s390/Makefile
@@ -62,5 +62,6 @@ endif
ifeq ($(subdir),wcsmbs)
sysdep_routines += wcslen wcslen-vx wcslen-c \
wcsnlen wcsnlen-vx wcsnlen-c \
- wcscpy wcscpy-vx wcscpy-c
+ wcscpy wcscpy-vx wcscpy-c \
+ wcpcpy wcpcpy-vx wcpcpy-c
endif
diff --git a/sysdeps/s390/ifunc-wcpcpy.h b/sysdeps/s390/ifunc-wcpcpy.h
new file mode 100644
index 0000000000000000..0d5e2ba1a0b09905
--- /dev/null
+++ b/sysdeps/s390/ifunc-wcpcpy.h
@@ -0,0 +1,53 @@
+/* wcpcpy 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_WCPCPY_IFUNC 1
+#else
+# define HAVE_WCPCPY_IFUNC 0
+#endif
+
+#ifdef HAVE_S390_VX_ASM_SUPPORT
+# define HAVE_WCPCPY_IFUNC_AND_VX_SUPPORT HAVE_WCPCPY_IFUNC
+#else
+# define HAVE_WCPCPY_IFUNC_AND_VX_SUPPORT 0
+#endif
+
+#if defined HAVE_S390_MIN_Z13_ZARCH_ASM_SUPPORT
+# define WCPCPY_DEFAULT WCPCPY_Z13
+/* The z13 ifunc variant is using the common code variant as fallback! */
+# define HAVE_WCPCPY_C 1
+# define HAVE_WCPCPY_Z13 1
+#else
+# define WCPCPY_DEFAULT WCPCPY_C
+# define HAVE_WCPCPY_C 1
+# define HAVE_WCPCPY_Z13 HAVE_WCPCPY_IFUNC_AND_VX_SUPPORT
+#endif
+
+#if HAVE_WCPCPY_C
+# define WCPCPY_C __wcpcpy_c
+#else
+# define WCPCPY_C NULL
+#endif
+
+#if HAVE_WCPCPY_Z13
+# define WCPCPY_Z13 __wcpcpy_vx
+#else
+# define WCPCPY_Z13 NULL
+#endif
diff --git a/sysdeps/s390/multiarch/Makefile b/sysdeps/s390/multiarch/Makefile
index 8828897a59ae580c..7d7b05dcf21cff7d 100644
--- a/sysdeps/s390/multiarch/Makefile
+++ b/sysdeps/s390/multiarch/Makefile
@@ -1,6 +1,5 @@
ifeq ($(subdir),wcsmbs)
-sysdep_routines += wcpcpy wcpcpy-vx wcpcpy-c \
- wcsncpy wcsncpy-vx wcsncpy-c \
+sysdep_routines += wcsncpy wcsncpy-vx wcsncpy-c \
wcpncpy wcpncpy-vx wcpncpy-c \
wcscat wcscat-vx wcscat-c \
wcsncat wcsncat-vx wcsncat-c \
diff --git a/sysdeps/s390/multiarch/ifunc-impl-list.c b/sysdeps/s390/multiarch/ifunc-impl-list.c
index aac8f4ea4671d0cf..656ab59db66dbb48 100644
--- a/sysdeps/s390/multiarch/ifunc-impl-list.c
+++ b/sysdeps/s390/multiarch/ifunc-impl-list.c
@@ -49,6 +49,7 @@
#include <ifunc-wcslen.h>
#include <ifunc-wcsnlen.h>
#include <ifunc-wcscpy.h>
+#include <ifunc-wcpcpy.h>
/* Maximum number of IFUNC implementations. */
#define MAX_IFUNC 3
@@ -463,6 +464,18 @@ __libc_ifunc_impl_list (const char *name, struct libc_ifunc_impl *array,
)
#endif /* HAVE_WCSCPY_IFUNC */
+#if HAVE_WCPCPY_IFUNC
+ IFUNC_IMPL (i, name, wcpcpy,
+# if HAVE_WCPCPY_Z13
+ IFUNC_IMPL_ADD (array, i, wcpcpy,
+ dl_hwcap & HWCAP_S390_VX, WCPCPY_Z13)
+# endif
+# if HAVE_WCPCPY_C
+ IFUNC_IMPL_ADD (array, i, wcpcpy, 1, WCPCPY_C)
+# endif
+ )
+#endif /* HAVE_WCPCPY_IFUNC */
+
#ifdef HAVE_S390_VX_ASM_SUPPORT
# define IFUNC_VX_IMPL(FUNC) \
@@ -471,8 +484,6 @@ __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 (wcpcpy);
-
IFUNC_VX_IMPL (wcsncpy);
IFUNC_VX_IMPL (wcpncpy);
diff --git a/sysdeps/s390/multiarch/wcpcpy-c.c b/sysdeps/s390/wcpcpy-c.c
similarity index 86%
rename from sysdeps/s390/multiarch/wcpcpy-c.c
rename to sysdeps/s390/wcpcpy-c.c
index e3282fde19c5262a..ed1539cde2f6f858 100644
--- a/sysdeps/s390/multiarch/wcpcpy-c.c
+++ b/sysdeps/s390/wcpcpy-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 WCPCPY __wcpcpy_c
+#include <ifunc-wcpcpy.h>
+
+#if HAVE_WCPCPY_C
+# if HAVE_WCPCPY_IFUNC || HAVE_WCPCPY_Z13
+# define WCPCPY WCPCPY_C
+# endif
-# include <wchar.h>
-extern __typeof (__wcpcpy) __wcpcpy_c;
# include <wcsmbs/wcpcpy.c>
#endif
diff --git a/sysdeps/s390/multiarch/wcpcpy-vx.S b/sysdeps/s390/wcpcpy-vx.S
similarity index 94%
rename from sysdeps/s390/multiarch/wcpcpy-vx.S
rename to sysdeps/s390/wcpcpy-vx.S
index bff6e8562884066c..5154ad44610c1ed1 100644
--- a/sysdeps/s390/multiarch/wcpcpy-vx.S
+++ b/sysdeps/s390/wcpcpy-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-wcpcpy.h>
+#if HAVE_WCPCPY_Z13
# include "sysdep.h"
# include "asm-syntax.h"
@@ -37,7 +38,7 @@
-v17=index of zero
-v18=part of src
*/
-ENTRY(__wcpcpy_vx)
+ENTRY(WCPCPY_Z13)
.machine "z13"
.machinemode "zarch_nohighgprs"
@@ -109,6 +110,11 @@ ENTRY(__wcpcpy_vx)
br %r14
.Lfallback:
- jg __wcpcpy_c
-END(__wcpcpy_vx)
-#endif /* HAVE_S390_VX_ASM_SUPPORT && IS_IN (libc) */
+ jg WCPCPY_C
+END(WCPCPY_Z13)
+
+# if ! HAVE_WCPCPY_IFUNC
+strong_alias (WCPCPY_Z13, __wcpcpy)
+weak_alias (__wcpcpy, wcpcpy)
+# endif
+#endif
diff --git a/sysdeps/s390/multiarch/wcpcpy.c b/sysdeps/s390/wcpcpy.c
similarity index 70%
rename from sysdeps/s390/multiarch/wcpcpy.c
rename to sysdeps/s390/wcpcpy.c
index f19d376d8530d0a4..34ac68b31fedcb09 100644
--- a/sysdeps/s390/multiarch/wcpcpy.c
+++ b/sysdeps/s390/wcpcpy.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-wcpcpy.h>
+
+#if HAVE_WCPCPY_IFUNC
# include <wchar.h>
# include <ifunc-resolve.h>
-s390_vx_libc_ifunc (__wcpcpy)
-weak_alias (__wcpcpy, wcpcpy)
+# if HAVE_WCPCPY_C
+extern __typeof (__wcpcpy) WCPCPY_C attribute_hidden;
+# endif
-#else
-# include <wcsmbs/wcpcpy.c>
-#endif /* !(defined HAVE_S390_VX_ASM_SUPPORT && IS_IN (libc)) */
+# if HAVE_WCPCPY_Z13
+extern __typeof (__wcpcpy) WCPCPY_Z13 attribute_hidden;
+# endif
+
+s390_libc_ifunc_expr (__wcpcpy, __wcpcpy,
+ (HAVE_WCPCPY_Z13 && (hwcap & HWCAP_S390_VX))
+ ? WCPCPY_Z13
+ : WCPCPY_DEFAULT
+ )
+weak_alias (__wcpcpy, wcpcpy)
+#endif
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