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glibc/SOURCES/glibc-rh1659438-52.patch

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commit c62534ae524111eae48b2c2adf3f9a2ca90824f5
Author: Stefan Liebler <stli@linux.ibm.com>
Date: Tue Dec 18 13:57:24 2018 +0100
S390: Refactor wmemchr ifunc handling.
The ifunc handling for wmemchr 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.
Glibc internal calls will use the "newer" ifunc variant.
ChangeLog:
* sysdeps/s390/multiarch/Makefile
(sysdep_routines): Remove wmemchr variants.
* sysdeps/s390/Makefile (sysdep_routines): Add wmemchr variants.
* sysdeps/s390/multiarch/ifunc-impl-list.c
(__libc_ifunc_impl_list): Refactor ifunc handling for wmemchr.
* sysdeps/s390/multiarch/wmemchr-c.c: Move to ...
* sysdeps/s390/wmemchr-c.c: ... here and adjust ifunc handling.
* sysdeps/s390/multiarch/wmemchr-vx.S: Move to ...
* sysdeps/s390/wmemchr-vx.S: ... here and adjust ifunc handling.
* sysdeps/s390/multiarch/wmemchr.c: Move to ...
* sysdeps/s390/wmemchr.c: ... here and adjust ifunc handling.
* sysdeps/s390/ifunc-wmemchr.h: New file.
diff --git a/sysdeps/s390/Makefile b/sysdeps/s390/Makefile
index da96ac3a36bd7f4e..fdfd1c605c28ddc7 100644
--- a/sysdeps/s390/Makefile
+++ b/sysdeps/s390/Makefile
@@ -75,5 +75,6 @@ sysdep_routines += wcslen wcslen-vx wcslen-c \
wcsrchr wcsrchr-vx wcsrchr-c \
wcsspn wcsspn-vx wcsspn-c \
wcspbrk wcspbrk-vx wcspbrk-c \
- wcscspn wcscspn-vx wcscspn-c
+ wcscspn wcscspn-vx wcscspn-c \
+ wmemchr wmemchr-vx wmemchr-c
endif
diff --git a/sysdeps/s390/ifunc-wmemchr.h b/sysdeps/s390/ifunc-wmemchr.h
new file mode 100644
index 0000000000000000..0610cfb5d4a7fb18
--- /dev/null
+++ b/sysdeps/s390/ifunc-wmemchr.h
@@ -0,0 +1,53 @@
+/* wmemchr 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_WMEMCHR_IFUNC 1
+#else
+# define HAVE_WMEMCHR_IFUNC 0
+#endif
+
+#ifdef HAVE_S390_VX_ASM_SUPPORT
+# define HAVE_WMEMCHR_IFUNC_AND_VX_SUPPORT HAVE_WMEMCHR_IFUNC
+#else
+# define HAVE_WMEMCHR_IFUNC_AND_VX_SUPPORT 0
+#endif
+
+#if defined HAVE_S390_MIN_Z13_ZARCH_ASM_SUPPORT
+# define WMEMCHR_DEFAULT WMEMCHR_Z13
+/* The z13 ifunc variant is using the common code variant as fallback! */
+# define HAVE_WMEMCHR_C 1
+# define HAVE_WMEMCHR_Z13 1
+#else
+# define WMEMCHR_DEFAULT WMEMCHR_C
+# define HAVE_WMEMCHR_C 1
+# define HAVE_WMEMCHR_Z13 HAVE_WMEMCHR_IFUNC_AND_VX_SUPPORT
+#endif
+
+#if HAVE_WMEMCHR_C
+# define WMEMCHR_C __wmemchr_c
+#else
+# define WMEMCHR_C NULL
+#endif
+
+#if HAVE_WMEMCHR_Z13
+# define WMEMCHR_Z13 __wmemchr_vx
+#else
+# define WMEMCHR_Z13 NULL
+#endif
diff --git a/sysdeps/s390/multiarch/Makefile b/sysdeps/s390/multiarch/Makefile
index 5be635542361b355..92e28dc45ddbae37 100644
--- a/sysdeps/s390/multiarch/Makefile
+++ b/sysdeps/s390/multiarch/Makefile
@@ -1,6 +1,5 @@
ifeq ($(subdir),wcsmbs)
-sysdep_routines += wmemchr wmemchr-vx wmemchr-c \
- wmemset wmemset-vx wmemset-c \
+sysdep_routines += wmemset wmemset-vx wmemset-c \
wmemcmp wmemcmp-vx wmemcmp-c
endif
diff --git a/sysdeps/s390/multiarch/ifunc-impl-list.c b/sysdeps/s390/multiarch/ifunc-impl-list.c
index 7d8031a069bd23ba..b5f55deb7faae9c4 100644
--- a/sysdeps/s390/multiarch/ifunc-impl-list.c
+++ b/sysdeps/s390/multiarch/ifunc-impl-list.c
@@ -62,6 +62,7 @@
#include <ifunc-wcsspn.h>
#include <ifunc-wcspbrk.h>
#include <ifunc-wcscspn.h>
+#include <ifunc-wmemchr.h>
/* Maximum number of IFUNC implementations. */
#define MAX_IFUNC 3
@@ -632,6 +633,18 @@ __libc_ifunc_impl_list (const char *name, struct libc_ifunc_impl *array,
)
#endif /* HAVE_WCSCSPN_IFUNC */
+#if HAVE_WMEMCHR_IFUNC
+ IFUNC_IMPL (i, name, wmemchr,
+# if HAVE_WMEMCHR_Z13
+ IFUNC_IMPL_ADD (array, i, wmemchr,
+ dl_hwcap & HWCAP_S390_VX, WMEMCHR_Z13)
+# endif
+# if HAVE_WMEMCHR_C
+ IFUNC_IMPL_ADD (array, i, wmemchr, 1, WMEMCHR_C)
+# endif
+ )
+#endif /* HAVE_WMEMCHR_IFUNC */
+
#ifdef HAVE_S390_VX_ASM_SUPPORT
# define IFUNC_VX_IMPL(FUNC) \
@@ -640,8 +653,6 @@ __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 (wmemchr);
-
IFUNC_VX_IMPL (wmemset);
IFUNC_VX_IMPL (wmemcmp);
diff --git a/sysdeps/s390/multiarch/wmemchr-c.c b/sysdeps/s390/wmemchr-c.c
similarity index 59%
rename from sysdeps/s390/multiarch/wmemchr-c.c
rename to sysdeps/s390/wmemchr-c.c
index 089392b512d29187..bb2526e76c41d0c7 100644
--- a/sysdeps/s390/multiarch/wmemchr-c.c
+++ b/sysdeps/s390/wmemchr-c.c
@@ -16,22 +16,29 @@
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 WMEMCHR __wmemchr_c
-
-# include <wchar.h>
-extern __typeof (wmemchr) __wmemchr_c;
-# undef weak_alias
-# define weak_alias(name, alias)
-# ifdef SHARED
-# undef libc_hidden_def
-# define libc_hidden_def(name) \
- __hidden_ver1 (__wmemchr_c, __GI___wmemchr, __wmemchr_c);
-# undef libc_hidden_weak
-# define libc_hidden_weak(name) \
+#include <ifunc-wmemchr.h>
+
+#if HAVE_WMEMCHR_C
+# if HAVE_WMEMCHR_IFUNC || HAVE_WMEMCHR_Z13
+# define WMEMCHR WMEMCHR_C
+
+# undef weak_alias
+# define weak_alias(name, alias)
+
+# if defined SHARED && IS_IN (libc)
+# undef libc_hidden_weak
+# define libc_hidden_weak(name)
+# undef libc_hidden_def
+# if ! defined HAVE_S390_MIN_Z13_ZARCH_ASM_SUPPORT
+# define libc_hidden_def(name) \
+ __hidden_ver1 (__wmemchr_c, __GI_wmemchr, __wmemchr_c) __attribute__((weak)); \
strong_alias (__wmemchr_c, __wmemchr_c_1); \
- __hidden_ver1 (__wmemchr_c_1, __GI_wmemchr, __wmemchr_c_1);
-# endif /* SHARED */
+ __hidden_ver1 (__wmemchr_c_1, __GI___wmemchr, __wmemchr_c_1);
+# else
+# define libc_hidden_def(name)
+# endif
+# endif
+# endif
# include <wcsmbs/wmemchr.c>
-#endif /* HAVE_S390_VX_ASM_SUPPORT && IS_IN (libc) */
+#endif
diff --git a/sysdeps/s390/multiarch/wmemchr-vx.S b/sysdeps/s390/wmemchr-vx.S
similarity index 92%
rename from sysdeps/s390/multiarch/wmemchr-vx.S
rename to sysdeps/s390/wmemchr-vx.S
index db057b579a7230f0..72e9ef59af77b8f7 100644
--- a/sysdeps/s390/multiarch/wmemchr-vx.S
+++ b/sysdeps/s390/wmemchr-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-wmemchr.h>
+#if HAVE_WMEMCHR_Z13
# include "sysdep.h"
# include "asm-syntax.h"
@@ -38,7 +39,7 @@
-v17=index of found c
-v18=c replicated
*/
-ENTRY(__wmemchr_vx)
+ENTRY(WMEMCHR_Z13)
.machine "z13"
.machinemode "zarch_nohighgprs"
@@ -161,6 +162,17 @@ ENTRY(__wmemchr_vx)
j .Llt64
.Lfallback:
- jg __wmemchr_c
-END(__wmemchr_vx)
-#endif /* HAVE_S390_VX_ASM_SUPPORT && IS_IN (libc) */
+ jg WMEMCHR_C
+END(WMEMCHR_Z13)
+
+# if ! HAVE_WMEMCHR_IFUNC
+strong_alias (WMEMCHR_Z13, __wmemchr)
+weak_alias (__wmemchr, wmemchr)
+# endif
+
+# if defined HAVE_S390_MIN_Z13_ZARCH_ASM_SUPPORT \
+ && defined SHARED && IS_IN (libc)
+strong_alias (WMEMCHR_Z13, __GI___wmemchr)
+weak_alias (WMEMCHR_Z13, __GI_wmemchr)
+# endif
+#endif
diff --git a/sysdeps/s390/multiarch/wmemchr.c b/sysdeps/s390/wmemchr.c
similarity index 70%
rename from sysdeps/s390/multiarch/wmemchr.c
rename to sysdeps/s390/wmemchr.c
index 6b55c1d7fa10afb9..0d2fbb22c6d65a97 100644
--- a/sysdeps/s390/multiarch/wmemchr.c
+++ b/sysdeps/s390/wmemchr.c
@@ -16,7 +16,9 @@
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-wmemchr.h>
+
+#if HAVE_WMEMCHR_IFUNC
# define wmemchr __redirect_wmemchr
# define __wmemchr __redirect___wmemchr
# include <wchar.h>
@@ -24,9 +26,18 @@
# undef __wmemchr
# include <ifunc-resolve.h>
-s390_vx_libc_ifunc_redirected (__redirect___wmemchr, __wmemchr)
-weak_alias (__wmemchr, wmemchr)
+# if HAVE_WMEMCHR_C
+extern __typeof (__redirect___wmemchr) WMEMCHR_C attribute_hidden;
+# endif
-#else
-# include <wcsmbs/wmemchr.c>
-#endif /* !(defined HAVE_S390_VX_ASM_SUPPORT && IS_IN (libc)) */
+# if HAVE_WMEMCHR_Z13
+extern __typeof (__redirect___wmemchr) WMEMCHR_Z13 attribute_hidden;
+# endif
+
+s390_libc_ifunc_expr (__redirect___wmemchr, __wmemchr,
+ (HAVE_WMEMCHR_Z13 && (hwcap & HWCAP_S390_VX))
+ ? WMEMCHR_Z13
+ : WMEMCHR_DEFAULT
+ )
+weak_alias (__wmemchr, wmemchr)
+#endif
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