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commit ff3ca3743a00af749258cc242457b648d65a1537
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Author: Stefan Liebler <stli@linux.ibm.com>
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Date: Tue Dec 18 13:57:10 2018 +0100
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S390: Refactor strlen ifunc handling.
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The ifunc handling for strlen is adjusted in order to omit ifunc
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variants if those will never be used as the minimum architecture level
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already supports newer CPUs by default.
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Glibc internal calls will then also use the "newer" ifunc variant.
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ChangeLog:
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* sysdeps/s390/multiarch/Makefile
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(sysdep_routines): Remove strlen variants.
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* sysdeps/s390/Makefile (sysdep_routines): Add strlen variants.
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* sysdeps/s390/multiarch/ifunc-impl-list.c
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(__libc_ifunc_impl_list): Refactor ifunc handling for strlen.
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* sysdeps/s390/multiarch/strlen-c.c: Move to ...
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* sysdeps/s390/strlen-c.c: ... here and adjust ifunc handling.
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* sysdeps/s390/multiarch/strlen-vx.S: Move to ...
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* sysdeps/s390/strlen-vx.S: ... here and adjust ifunc handling.
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* sysdeps/s390/multiarch/strlen.c: Move to ...
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* sysdeps/s390/strlen.c: ... here and adjust ifunc handling.
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* sysdeps/s390/ifunc-strlen.h: New file.
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diff --git a/sysdeps/s390/Makefile b/sysdeps/s390/Makefile
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index 47d606d3d5d99274..600d8e629df7090e 100644
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--- a/sysdeps/s390/Makefile
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+++ b/sysdeps/s390/Makefile
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@@ -36,5 +36,6 @@ sysdep_routines += bzero memset memset-z900 \
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mempcpy memcpy memcpy-z900 \
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memmove memmove-c \
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strstr strstr-vx strstr-c \
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- memmem memmem-vx memmem-c
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+ memmem memmem-vx memmem-c \
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+ strlen strlen-vx strlen-c
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endif
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diff --git a/sysdeps/s390/ifunc-strlen.h b/sysdeps/s390/ifunc-strlen.h
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new file mode 100644
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index 0000000000000000..f2070596636f29a9
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--- /dev/null
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+++ b/sysdeps/s390/ifunc-strlen.h
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@@ -0,0 +1,52 @@
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+/* strlen variant information on S/390 version.
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+ Copyright (C) 2018 Free Software Foundation, Inc.
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+ This file is part of the GNU C Library.
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+
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+ The GNU C Library is free software; you can redistribute it and/or
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+ modify it under the terms of the GNU Lesser General Public
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+ License as published by the Free Software Foundation; either
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+ version 2.1 of the License, or (at your option) any later version.
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+
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+ The GNU C Library is distributed in the hope that it will be useful,
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+ but WITHOUT ANY WARRANTY; without even the implied warranty of
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+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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+ Lesser General Public License for more details.
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+
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+ You should have received a copy of the GNU Lesser General Public
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+ License along with the GNU C Library; if not, see
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+ <http://www.gnu.org/licenses/>. */
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+
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+#if defined USE_MULTIARCH && IS_IN (libc) \
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+ && ! defined HAVE_S390_MIN_Z13_ZARCH_ASM_SUPPORT
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+# define HAVE_STRLEN_IFUNC 1
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+#else
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+# define HAVE_STRLEN_IFUNC 0
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+#endif
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+
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+#ifdef HAVE_S390_VX_ASM_SUPPORT
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+# define HAVE_STRLEN_IFUNC_AND_VX_SUPPORT HAVE_STRLEN_IFUNC
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+#else
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+# define HAVE_STRLEN_IFUNC_AND_VX_SUPPORT 0
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+#endif
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+
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+#if defined HAVE_S390_MIN_Z13_ZARCH_ASM_SUPPORT
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+# define STRLEN_DEFAULT STRLEN_Z13
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+# define HAVE_STRLEN_C 0
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+# define HAVE_STRLEN_Z13 1
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+#else
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+# define STRLEN_DEFAULT STRLEN_C
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+# define HAVE_STRLEN_C 1
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+# define HAVE_STRLEN_Z13 HAVE_STRLEN_IFUNC_AND_VX_SUPPORT
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+#endif
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+
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+#if HAVE_STRLEN_C
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+# define STRLEN_C __strlen_c
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+#else
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+# define STRLEN_C NULL
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+#endif
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+
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+#if HAVE_STRLEN_Z13
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+# define STRLEN_Z13 __strlen_vx
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+#else
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+# define STRLEN_Z13 NULL
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+#endif
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diff --git a/sysdeps/s390/multiarch/Makefile b/sysdeps/s390/multiarch/Makefile
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index 24949cd3a88b8015..601523919c235f76 100644
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--- a/sysdeps/s390/multiarch/Makefile
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+++ b/sysdeps/s390/multiarch/Makefile
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@@ -1,6 +1,5 @@
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ifeq ($(subdir),string)
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-sysdep_routines += strlen strlen-vx strlen-c \
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- strnlen strnlen-vx strnlen-c \
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+sysdep_routines += strnlen strnlen-vx strnlen-c \
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strcpy strcpy-vx \
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stpcpy stpcpy-vx stpcpy-c \
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strncpy strncpy-vx \
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diff --git a/sysdeps/s390/multiarch/ifunc-impl-list.c b/sysdeps/s390/multiarch/ifunc-impl-list.c
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index da8696d917abf51c..c531be4bc7eb3f55 100644
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--- a/sysdeps/s390/multiarch/ifunc-impl-list.c
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+++ b/sysdeps/s390/multiarch/ifunc-impl-list.c
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@@ -26,6 +26,7 @@
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#include <ifunc-memcpy.h>
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#include <ifunc-strstr.h>
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#include <ifunc-memmem.h>
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+#include <ifunc-strlen.h>
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/* Maximum number of IFUNC implementations. */
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#define MAX_IFUNC 3
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@@ -164,6 +165,18 @@ __libc_ifunc_impl_list (const char *name, struct libc_ifunc_impl *array,
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)
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#endif /* HAVE_MEMMEM_IFUNC */
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+#if HAVE_STRLEN_IFUNC
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+ IFUNC_IMPL (i, name, strlen,
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+# if HAVE_STRLEN_Z13
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+ IFUNC_IMPL_ADD (array, i, strlen,
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+ dl_hwcap & HWCAP_S390_VX, STRLEN_Z13)
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+# endif
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+# if HAVE_STRLEN_C
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+ IFUNC_IMPL_ADD (array, i, strlen, 1, STRLEN_C)
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+# endif
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+ )
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+#endif /* HAVE_STRLEN_IFUNC */
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+
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#ifdef HAVE_S390_VX_ASM_SUPPORT
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# define IFUNC_VX_IMPL(FUNC) \
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@@ -172,7 +185,6 @@ __libc_ifunc_impl_list (const char *name, struct libc_ifunc_impl *array,
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__##FUNC##_vx) \
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IFUNC_IMPL_ADD (array, i, FUNC, 1, __##FUNC##_c))
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- IFUNC_VX_IMPL (strlen);
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IFUNC_VX_IMPL (wcslen);
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IFUNC_VX_IMPL (strnlen);
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diff --git a/sysdeps/s390/multiarch/strlen-c.c b/sysdeps/s390/strlen-c.c
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similarity index 78%
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rename from sysdeps/s390/multiarch/strlen-c.c
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rename to sysdeps/s390/strlen-c.c
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index a2c8e43624a9bc91..b4569701af96f4a9 100644
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--- a/sysdeps/s390/multiarch/strlen-c.c
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+++ b/sysdeps/s390/strlen-c.c
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@@ -16,13 +16,17 @@
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>. */
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-#if defined HAVE_S390_VX_ASM_SUPPORT && IS_IN (libc)
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-# define STRLEN __strlen_c
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-# ifdef SHARED
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-# undef libc_hidden_builtin_def
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-# define libc_hidden_builtin_def(name) \
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+#include <ifunc-strlen.h>
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+
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+#if HAVE_STRLEN_C
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+# if HAVE_STRLEN_IFUNC
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+# define STRLEN STRLEN_C
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+# if defined SHARED && IS_IN (libc)
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+# undef libc_hidden_builtin_def
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+# define libc_hidden_builtin_def(name) \
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__hidden_ver1 (__strlen_c, __GI_strlen, __strlen_c);
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-# endif /* SHARED */
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+# endif
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+# endif
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# include <string/strlen.c>
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-#endif /* HAVE_S390_VX_ASM_SUPPORT && IS_IN (libc) */
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+#endif
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diff --git a/sysdeps/s390/multiarch/strlen-vx.S b/sysdeps/s390/strlen-vx.S
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similarity index 90%
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rename from sysdeps/s390/multiarch/strlen-vx.S
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rename to sysdeps/s390/strlen-vx.S
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index 9308b332371dcdaa..39ef43107d11ec73 100644
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--- a/sysdeps/s390/multiarch/strlen-vx.S
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+++ b/sysdeps/s390/strlen-vx.S
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@@ -16,7 +16,8 @@
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>. */
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-#if defined HAVE_S390_VX_ASM_SUPPORT && IS_IN (libc)
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+#include <ifunc-strlen.h>
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+#if HAVE_STRLEN_Z13
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# include "sysdep.h"
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# include "asm-syntax.h"
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@@ -34,7 +35,7 @@
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-r5=current_len and return_value
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-v16=part of s
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*/
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-ENTRY(__strlen_vx)
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+ENTRY(STRLEN_Z13)
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.machine "z13"
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.machinemode "zarch_nohighgprs"
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@@ -80,5 +81,13 @@ ENTRY(__strlen_vx)
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vlgvb %r2,%v16,7 /* Load byte index of zero. */
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algr %r2,%r5
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br %r14
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-END(__strlen_vx)
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-#endif /* HAVE_S390_VX_ASM_SUPPORT && IS_IN (libc) */
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+END(STRLEN_Z13)
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+
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+# if ! HAVE_STRLEN_IFUNC
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+strong_alias (STRLEN_Z13, strlen)
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+# endif
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+
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+# if ! HAVE_STRLEN_C && defined SHARED && IS_IN (libc)
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+strong_alias (STRLEN_Z13, __GI_strlen)
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+# endif
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+#endif
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diff --git a/sysdeps/s390/multiarch/strlen.c b/sysdeps/s390/strlen.c
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similarity index 69%
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rename from sysdeps/s390/multiarch/strlen.c
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rename to sysdeps/s390/strlen.c
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index 0edf8b7d0231cf31..6ba0fe86fe9789f0 100644
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--- a/sysdeps/s390/multiarch/strlen.c
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+++ b/sysdeps/s390/strlen.c
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@@ -16,14 +16,25 @@
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>. */
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-#if defined HAVE_S390_VX_ASM_SUPPORT && IS_IN (libc)
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+#include <ifunc-strlen.h>
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+
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+#if HAVE_STRLEN_IFUNC
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# define strlen __redirect_strlen
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# include <string.h>
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# include <ifunc-resolve.h>
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# undef strlen
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-s390_vx_libc_ifunc2_redirected (__redirect_strlen, __strlen, strlen)
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+# if HAVE_STRLEN_C
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+extern __typeof (__redirect_strlen) STRLEN_C attribute_hidden;
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+# endif
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+
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+# if HAVE_STRLEN_Z13
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+extern __typeof (__redirect_strlen) STRLEN_Z13 attribute_hidden;
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+# endif
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-#else
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-# include <string/strlen.c>
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-#endif /* !(defined HAVE_S390_VX_ASM_SUPPORT && IS_IN (libc)) */
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+s390_libc_ifunc_expr (__redirect_strlen, strlen,
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+ (HAVE_STRLEN_Z13 && (hwcap & HWCAP_S390_VX))
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+ ? STRLEN_Z13
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+ : STRLEN_DEFAULT
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+ )
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+#endif
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