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glibc/SOURCES/glibc-rh1659438-48.patch

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commit 4753713aaed400d88cfc598e25d504478120b065
Author: Stefan Liebler <stli@linux.ibm.com>
Date: Tue Dec 18 13:57:22 2018 +0100
S390: Refactor wcsrchr ifunc handling.
The ifunc handling for wcsrchr 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 wcsrchr variants.
* sysdeps/s390/Makefile (sysdep_routines): Add wcsrchr variants.
* sysdeps/s390/multiarch/ifunc-impl-list.c
(__libc_ifunc_impl_list): Refactor ifunc handling for wcsrchr.
* sysdeps/s390/multiarch/wcsrchr-c.c: Move to ...
* sysdeps/s390/wcsrchr-c.c: ... here and adjust ifunc handling.
* sysdeps/s390/multiarch/wcsrchr-vx.S: Move to ...
* sysdeps/s390/wcsrchr-vx.S: ... here and adjust ifunc handling.
* sysdeps/s390/multiarch/wcsrchr.c: Move to ...
* sysdeps/s390/wcsrchr.c: ... here and adjust ifunc handling.
* sysdeps/s390/ifunc-wcsrchr.h: New file.
diff --git a/sysdeps/s390/Makefile b/sysdeps/s390/Makefile
index a6ebf11ad1913cc4..19a556eccf285e2f 100644
--- a/sysdeps/s390/Makefile
+++ b/sysdeps/s390/Makefile
@@ -71,5 +71,6 @@ sysdep_routines += wcslen wcslen-vx wcslen-c \
wcscmp wcscmp-vx wcscmp-c \
wcsncmp wcsncmp-vx wcsncmp-c \
wcschr wcschr-vx wcschr-c \
- wcschrnul wcschrnul-vx wcschrnul-c
+ wcschrnul wcschrnul-vx wcschrnul-c \
+ wcsrchr wcsrchr-vx wcsrchr-c
endif
diff --git a/sysdeps/s390/ifunc-wcsrchr.h b/sysdeps/s390/ifunc-wcsrchr.h
new file mode 100644
index 0000000000000000..4eec0c17074c99fc
--- /dev/null
+++ b/sysdeps/s390/ifunc-wcsrchr.h
@@ -0,0 +1,53 @@
+/* wcsrchr 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_WCSRCHR_IFUNC 1
+#else
+# define HAVE_WCSRCHR_IFUNC 0
+#endif
+
+#ifdef HAVE_S390_VX_ASM_SUPPORT
+# define HAVE_WCSRCHR_IFUNC_AND_VX_SUPPORT HAVE_WCSRCHR_IFUNC
+#else
+# define HAVE_WCSRCHR_IFUNC_AND_VX_SUPPORT 0
+#endif
+
+#if defined HAVE_S390_MIN_Z13_ZARCH_ASM_SUPPORT
+# define WCSRCHR_DEFAULT WCSRCHR_Z13
+/* The z13 ifunc variant is using the common code variant as fallback! */
+# define HAVE_WCSRCHR_C 1
+# define HAVE_WCSRCHR_Z13 1
+#else
+# define WCSRCHR_DEFAULT WCSRCHR_C
+# define HAVE_WCSRCHR_C 1
+# define HAVE_WCSRCHR_Z13 HAVE_WCSRCHR_IFUNC_AND_VX_SUPPORT
+#endif
+
+#if HAVE_WCSRCHR_C
+# define WCSRCHR_C __wcsrchr_c
+#else
+# define WCSRCHR_C NULL
+#endif
+
+#if HAVE_WCSRCHR_Z13
+# define WCSRCHR_Z13 __wcsrchr_vx
+#else
+# define WCSRCHR_Z13 NULL
+#endif
diff --git a/sysdeps/s390/multiarch/Makefile b/sysdeps/s390/multiarch/Makefile
index 0eb01d5d84c60408..3d72cbb5f32e68f3 100644
--- a/sysdeps/s390/multiarch/Makefile
+++ b/sysdeps/s390/multiarch/Makefile
@@ -1,6 +1,5 @@
ifeq ($(subdir),wcsmbs)
-sysdep_routines += wcsrchr wcsrchr-vx wcsrchr-c \
- wcsspn wcsspn-vx wcsspn-c \
+sysdep_routines += wcsspn wcsspn-vx wcsspn-c \
wcspbrk wcspbrk-vx wcspbrk-c \
wcscspn wcscspn-vx wcscspn-c \
wmemchr wmemchr-vx wmemchr-c \
diff --git a/sysdeps/s390/multiarch/ifunc-impl-list.c b/sysdeps/s390/multiarch/ifunc-impl-list.c
index 553a76c39ecc87ae..ffb4d5b6872ef9db 100644
--- a/sysdeps/s390/multiarch/ifunc-impl-list.c
+++ b/sysdeps/s390/multiarch/ifunc-impl-list.c
@@ -58,6 +58,7 @@
#include <ifunc-wcsncmp.h>
#include <ifunc-wcschr.h>
#include <ifunc-wcschrnul.h>
+#include <ifunc-wcsrchr.h>
/* Maximum number of IFUNC implementations. */
#define MAX_IFUNC 3
@@ -580,6 +581,18 @@ __libc_ifunc_impl_list (const char *name, struct libc_ifunc_impl *array,
)
#endif /* HAVE_WCSCHRNUL_IFUNC */
+#if HAVE_WCSRCHR_IFUNC
+ IFUNC_IMPL (i, name, wcsrchr,
+# if HAVE_WCSRCHR_Z13
+ IFUNC_IMPL_ADD (array, i, wcsrchr,
+ dl_hwcap & HWCAP_S390_VX, WCSRCHR_Z13)
+# endif
+# if HAVE_WCSRCHR_C
+ IFUNC_IMPL_ADD (array, i, wcsrchr, 1, WCSRCHR_C)
+# endif
+ )
+#endif /* HAVE_WCSRCHR_IFUNC */
+
#ifdef HAVE_S390_VX_ASM_SUPPORT
# define IFUNC_VX_IMPL(FUNC) \
@@ -588,8 +601,6 @@ __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 (wcsrchr);
-
IFUNC_VX_IMPL (wcsspn);
IFUNC_VX_IMPL (wcspbrk);
diff --git a/sysdeps/s390/multiarch/wcsrchr-c.c b/sysdeps/s390/wcsrchr-c.c
similarity index 85%
rename from sysdeps/s390/multiarch/wcsrchr-c.c
rename to sysdeps/s390/wcsrchr-c.c
index 615250358ba9c00a..65164a897fb773f7 100644
--- a/sysdeps/s390/multiarch/wcsrchr-c.c
+++ b/sysdeps/s390/wcsrchr-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 WCSRCHR __wcsrchr_c
+#include <ifunc-wcsrchr.h>
+
+#if HAVE_WCSRCHR_C
+# if HAVE_WCSRCHR_IFUNC || HAVE_WCSRCHR_Z13
+# define WCSRCHR WCSRCHR_C
+# endif
-# include <wchar.h>
-extern __typeof (wcsrchr) __wcsrchr_c;
# include <wcsmbs/wcsrchr.c>
#endif
diff --git a/sysdeps/s390/multiarch/wcsrchr-vx.S b/sysdeps/s390/wcsrchr-vx.S
similarity index 97%
rename from sysdeps/s390/multiarch/wcsrchr-vx.S
rename to sysdeps/s390/wcsrchr-vx.S
index e40a554e5d9a216d..c7b6585beaeaef53 100644
--- a/sysdeps/s390/multiarch/wcsrchr-vx.S
+++ b/sysdeps/s390/wcsrchr-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-wcsrchr.h>
+#if HAVE_WCSRCHR_Z13
# include "sysdep.h"
# include "asm-syntax.h"
@@ -39,7 +40,7 @@
-v19=part of s with last occurence of c.
-v20=permute pattern
*/
-ENTRY(__wcsrchr_vx)
+ENTRY(WCSRCHR_Z13)
.machine "z13"
.machinemode "zarch_nohighgprs"
@@ -185,6 +186,10 @@ ENTRY(__wcsrchr_vx)
.byte 0x0C,0x0D,0x0E,0x0F,0x08,0x09,0x0A,0x0B
.byte 0x04,0x05,0x06,0x07,0x00,0x01,0x02,0x03
.Lfallback:
- jg __wcsrchr_c
-END(__wcsrchr_vx)
-#endif /* HAVE_S390_VX_ASM_SUPPORT && IS_IN (libc) */
+ jg WCSRCHR_C
+END(WCSRCHR_Z13)
+
+# if ! HAVE_WCSRCHR_IFUNC
+strong_alias (WCSRCHR_Z13, wcsrchr)
+# endif
+#endif
diff --git a/sysdeps/s390/multiarch/wcsrchr.c b/sysdeps/s390/wcsrchr.c
similarity index 69%
rename from sysdeps/s390/multiarch/wcsrchr.c
rename to sysdeps/s390/wcsrchr.c
index aa0b8a8f82545f64..eb70f270383880f2 100644
--- a/sysdeps/s390/multiarch/wcsrchr.c
+++ b/sysdeps/s390/wcsrchr.c
@@ -16,12 +16,23 @@
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-wcsrchr.h>
+
+#if HAVE_WCSRCHR_IFUNC
# include <wchar.h>
# include <ifunc-resolve.h>
-s390_vx_libc_ifunc2 (__wcsrchr, wcsrchr)
+# if HAVE_WCSRCHR_C
+extern __typeof (wcsrchr) WCSRCHR_C attribute_hidden;
+# endif
+
+# if HAVE_WCSRCHR_Z13
+extern __typeof (wcsrchr) WCSRCHR_Z13 attribute_hidden;
+# endif
-#else
-# include <wcsmbs/wcsrchr.c>
-#endif /* !(defined HAVE_S390_VX_ASM_SUPPORT && IS_IN (libc)) */
+s390_libc_ifunc_expr (wcsrchr, wcsrchr,
+ (HAVE_WCSRCHR_Z13 && (hwcap & HWCAP_S390_VX))
+ ? WCSRCHR_Z13
+ : WCSRCHR_DEFAULT
+ )
+#endif
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