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commit d1bdbf380908c34f31ba145ec9afebade3f1418f
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Author: Stefan Liebler <stli@linux.ibm.com>
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Date: Tue Dec 18 13:57:11 2018 +0100
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S390: Refactor strncpy ifunc handling.
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The ifunc handling for strncpy 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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Note: The fallback s390-32/s390-64 ifunc variants are now moved to
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the strncpy-z900.S files. The s390-32/s390-64 files multiarch/strncpy.c
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and strncpy.S are deleted.
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ChangeLog:
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* sysdeps/s390/multiarch/Makefile
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(sysdep_routines): Remove strncpy variants.
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* sysdeps/s390/Makefile (sysdep_routines): Add strncpy variants.
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* sysdeps/s390/multiarch/ifunc-impl-list.c
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(__libc_ifunc_impl_list): Refactor ifunc handling for strncpy.
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* sysdeps/s390/multiarch/strncpy-vx.S: Move to ...
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* sysdeps/s390/strncpy-vx.S: ... here and adjust ifunc handling.
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* sysdeps/s390/multiarch/strncpy.c: Move to ...
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* sysdeps/s390/strncpy.c: ... here and adjust ifunc handling.
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* sysdeps/s390/ifunc-strncpy.h: New file.
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* sysdeps/s390/s390-64/strncpy.S: Move to ...
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* sysdeps/s390/s390-64/strncpy-z900.S: ... here
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and adjust ifunc handling.
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* sysdeps/s390/s390-32/strncpy.S: Move to ...
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* sysdeps/s390/s390-32/strncpy-z900.S: ... here
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and adjust ifunc handling.
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* sysdeps/s390/s390-32/multiarch/strncpy.c: Delete file.
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* sysdeps/s390/s390-64/multiarch/strncpy.c: Likewise.
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diff --git a/sysdeps/s390/Makefile b/sysdeps/s390/Makefile
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index b7e1bc8aecf2f8c9..db060c81aade84ca 100644
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--- a/sysdeps/s390/Makefile
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+++ b/sysdeps/s390/Makefile
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@@ -40,5 +40,6 @@ sysdep_routines += bzero memset memset-z900 \
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strlen strlen-vx strlen-c \
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strnlen strnlen-vx strnlen-c \
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strcpy strcpy-vx strcpy-z900 \
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- stpcpy stpcpy-vx stpcpy-c
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+ stpcpy stpcpy-vx stpcpy-c \
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+ strncpy strncpy-vx strncpy-z900
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endif
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diff --git a/sysdeps/s390/ifunc-strncpy.h b/sysdeps/s390/ifunc-strncpy.h
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new file mode 100644
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index 0000000000000000..31e87e93c529c443
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--- /dev/null
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+++ b/sysdeps/s390/ifunc-strncpy.h
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@@ -0,0 +1,52 @@
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+/* strncpy 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_STRNCPY_IFUNC 1
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+#else
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+# define HAVE_STRNCPY_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_STRNCPY_IFUNC_AND_VX_SUPPORT HAVE_STRNCPY_IFUNC
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+#else
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+# define HAVE_STRNCPY_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 STRNCPY_DEFAULT STRNCPY_Z13
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+# define HAVE_STRNCPY_Z900_G5 0
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+# define HAVE_STRNCPY_Z13 1
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+#else
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+# define STRNCPY_DEFAULT STRNCPY_Z900_G5
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+# define HAVE_STRNCPY_Z900_G5 1
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+# define HAVE_STRNCPY_Z13 HAVE_STRNCPY_IFUNC_AND_VX_SUPPORT
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+#endif
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+
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+#if HAVE_STRNCPY_Z900_G5
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+# define STRNCPY_Z900_G5 __strncpy_default
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+#else
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+# define STRNCPY_Z900_G5 NULL
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+#endif
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+
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+#if HAVE_STRNCPY_Z13
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+# define STRNCPY_Z13 __strncpy_vx
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+#else
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+# define STRNCPY_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 9517417dcbe1c701..c5189b556cf3762d 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 += strncpy strncpy-vx \
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- stpncpy stpncpy-vx stpncpy-c \
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+sysdep_routines += stpncpy stpncpy-vx stpncpy-c \
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strcat strcat-vx strcat-c \
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strncat strncat-vx strncat-c \
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strcmp strcmp-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 678ed13833332f11..d598fc5c22050da2 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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@@ -30,6 +30,7 @@
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#include <ifunc-strnlen.h>
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#include <ifunc-strcpy.h>
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#include <ifunc-stpcpy.h>
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+#include <ifunc-strncpy.h>
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/* Maximum number of IFUNC implementations. */
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#define MAX_IFUNC 3
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@@ -216,6 +217,19 @@ __libc_ifunc_impl_list (const char *name, struct libc_ifunc_impl *array,
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)
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#endif /* HAVE_STPCPY_IFUNC */
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+#if HAVE_STRNCPY_IFUNC
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+ IFUNC_IMPL (i, name, strncpy,
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+# if HAVE_STRNCPY_Z13
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+ IFUNC_IMPL_ADD (array, i, strncpy,
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+ dl_hwcap & HWCAP_S390_VX, STRNCPY_Z13)
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+# endif
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+# if HAVE_STRNCPY_Z900_G5
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+ IFUNC_IMPL_ADD (array, i, strncpy, 1, STRNCPY_Z900_G5)
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+# endif
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+ )
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+#endif /* HAVE_STRNCPY_IFUNC */
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+
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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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@@ -232,7 +246,6 @@ __libc_ifunc_impl_list (const char *name, struct libc_ifunc_impl *array,
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IFUNC_VX_IMPL (wcpcpy);
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- IFUNC_VX_IMPL (strncpy);
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IFUNC_VX_IMPL (wcsncpy);
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IFUNC_VX_IMPL (stpncpy);
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diff --git a/sysdeps/s390/s390-32/multiarch/strncpy.c b/sysdeps/s390/s390-32/multiarch/strncpy.c
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deleted file mode 100644
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index 57f9df18d12c1959..0000000000000000
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--- a/sysdeps/s390/s390-32/multiarch/strncpy.c
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+++ /dev/null
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@@ -1,21 +0,0 @@
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-/* Multiple versions of strncpy.
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- Copyright (C) 2015-2018 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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-/* This wrapper-file is needed, because otherwise file
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- sysdeps/s390/s390-[32|64]/strncpy.S will be used. */
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-#include <sysdeps/s390/multiarch/strncpy.c>
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diff --git a/sysdeps/s390/s390-32/strncpy.S b/sysdeps/s390/s390-32/strncpy-z900.S
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similarity index 89%
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rename from sysdeps/s390/s390-32/strncpy.S
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rename to sysdeps/s390/s390-32/strncpy-z900.S
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index 9086eb1c707bdfb3..ebdaba015214bc59 100644
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--- a/sysdeps/s390/s390-32/strncpy.S
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+++ b/sysdeps/s390/s390-32/strncpy-z900.S
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@@ -24,10 +24,12 @@
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* R4 = max of bytes to copy
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*/
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+#include <ifunc-strncpy.h>
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#include "sysdep.h"
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#include "asm-syntax.h"
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-ENTRY(strncpy)
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+#if HAVE_STRNCPY_Z900_G5
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+ENTRY(STRNCPY_Z900_G5)
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.text
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st %r2,24(%r15) # save dst pointer
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slr %r2,%r3 # %r3 points to src, %r2+%r3 to dst
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@@ -75,5 +77,13 @@ ENTRY(strncpy)
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jo .L9
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.Lexit: l %r2,24(%r15) # return dst pointer
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br %r14
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-END(strncpy)
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-libc_hidden_builtin_def (strncpy)
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+END(STRNCPY_Z900_G5)
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+
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+# if ! HAVE_STRNCPY_IFUNC
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+strong_alias (STRNCPY_Z900_G5, strncpy)
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+# endif
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+
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+# if defined SHARED && IS_IN (libc)
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+strong_alias (STRNCPY_Z900_G5, __GI_strncpy)
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+# endif
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+#endif
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diff --git a/sysdeps/s390/s390-64/multiarch/strncpy.c b/sysdeps/s390/s390-64/multiarch/strncpy.c
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deleted file mode 100644
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index 57f9df18d12c1959..0000000000000000
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--- a/sysdeps/s390/s390-64/multiarch/strncpy.c
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+++ /dev/null
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@@ -1,21 +0,0 @@
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-/* Multiple versions of strncpy.
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- Copyright (C) 2015-2018 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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d8307d |
- modify it under the terms of the GNU Lesser General Public
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d8307d |
- License as published by the Free Software Foundation; either
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d8307d |
- version 2.1 of the License, or (at your option) any later version.
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d8307d |
-
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d8307d |
- The GNU C Library is distributed in the hope that it will be useful,
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d8307d |
- but WITHOUT ANY WARRANTY; without even the implied warranty of
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d8307d |
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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d8307d |
- Lesser General Public License for more details.
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d8307d |
-
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d8307d |
- You should have received a copy of the GNU Lesser General Public
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d8307d |
- License along with the GNU C Library; if not, see
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d8307d |
- <http://www.gnu.org/licenses/>. */
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d8307d |
-
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-/* This wrapper-file is needed, because otherwise file
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- sysdeps/s390/s390-[32|64]/strncpy.S will be used. */
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-#include <sysdeps/s390/multiarch/strncpy.c>
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diff --git a/sysdeps/s390/s390-64/strncpy.S b/sysdeps/s390/s390-64/strncpy-z900.S
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similarity index 90%
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rename from sysdeps/s390/s390-64/strncpy.S
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rename to sysdeps/s390/s390-64/strncpy-z900.S
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index be40aa32d5d9a2df..5732e6d83b5e8f30 100644
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--- a/sysdeps/s390/s390-64/strncpy.S
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+++ b/sysdeps/s390/s390-64/strncpy-z900.S
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@@ -23,10 +23,12 @@
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%r3 = address of source (src)
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%r4 = max of bytes to copy. */
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d8307d |
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+#include <ifunc-strncpy.h>
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#include "sysdep.h"
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#include "asm-syntax.h"
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-ENTRY(strncpy)
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+#if HAVE_STRNCPY_Z900_G5
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d8307d |
+ENTRY(STRNCPY_Z900_G5)
|
|
|
d8307d |
.text
|
|
|
d8307d |
stg %r2,48(%r15) # save dst pointer
|
|
|
d8307d |
slgr %r2,%r3 # %r3 points to src, %r2+%r3 to dst
|
|
|
d8307d |
@@ -86,5 +88,13 @@ ENTRY(strncpy)
|
|
|
d8307d |
jo .L13
|
|
|
d8307d |
.Lexit: lg %r2,48(%r15) # return dst pointer
|
|
|
d8307d |
br %r14
|
|
|
d8307d |
-END(strncpy)
|
|
|
d8307d |
-libc_hidden_builtin_def (strncpy)
|
|
|
d8307d |
+END(STRNCPY_Z900_G5)
|
|
|
d8307d |
+
|
|
|
d8307d |
+# if ! HAVE_STRNCPY_IFUNC
|
|
|
d8307d |
+strong_alias (STRNCPY_Z900_G5, strncpy)
|
|
|
d8307d |
+# endif
|
|
|
d8307d |
+
|
|
|
d8307d |
+# if defined SHARED && IS_IN (libc)
|
|
|
d8307d |
+strong_alias (STRNCPY_Z900_G5, __GI_strncpy)
|
|
|
d8307d |
+# endif
|
|
|
d8307d |
+#endif
|
|
|
d8307d |
diff --git a/sysdeps/s390/multiarch/strncpy-vx.S b/sysdeps/s390/strncpy-vx.S
|
|
|
d8307d |
similarity index 93%
|
|
|
d8307d |
rename from sysdeps/s390/multiarch/strncpy-vx.S
|
|
|
d8307d |
rename to sysdeps/s390/strncpy-vx.S
|
|
|
d8307d |
index 2a37b7b84e0a2514..be09ddf092388c72 100644
|
|
|
d8307d |
--- a/sysdeps/s390/multiarch/strncpy-vx.S
|
|
|
d8307d |
+++ b/sysdeps/s390/strncpy-vx.S
|
|
|
d8307d |
@@ -16,13 +16,13 @@
|
|
|
d8307d |
License along with the GNU C Library; if not, see
|
|
|
d8307d |
<http://www.gnu.org/licenses/>. */
|
|
|
d8307d |
|
|
|
d8307d |
-#if defined HAVE_S390_VX_ASM_SUPPORT && IS_IN (libc)
|
|
|
d8307d |
-
|
|
|
d8307d |
-# include "sysdep.h"
|
|
|
d8307d |
-# include "asm-syntax.h"
|
|
|
d8307d |
+#include <ifunc-strncpy.h>
|
|
|
d8307d |
+#include "sysdep.h"
|
|
|
d8307d |
+#include "asm-syntax.h"
|
|
|
d8307d |
|
|
|
d8307d |
.text
|
|
|
d8307d |
|
|
|
d8307d |
+#if HAVE_STRNCPY_Z13
|
|
|
d8307d |
/* char * strncpy (const char *dest, const char *src, size_t n)
|
|
|
d8307d |
Copy at most n characters of string src to dest.
|
|
|
d8307d |
|
|
|
d8307d |
@@ -40,7 +40,7 @@
|
|
|
d8307d |
-v18=part of src
|
|
|
d8307d |
-v31=register save area for r6, r7
|
|
|
d8307d |
*/
|
|
|
d8307d |
-ENTRY(__strncpy_vx)
|
|
|
d8307d |
+ENTRY(STRNCPY_Z13)
|
|
|
d8307d |
.machine "z13"
|
|
|
d8307d |
.machinemode "zarch_nohighgprs"
|
|
|
d8307d |
|
|
|
d8307d |
@@ -196,12 +196,13 @@ ENTRY(__strncpy_vx)
|
|
|
d8307d |
|
|
|
d8307d |
vl %v16,0(%r5,%r3) /* Load s. */
|
|
|
d8307d |
j .Llt64
|
|
|
d8307d |
-END(__strncpy_vx)
|
|
|
d8307d |
+END(STRNCPY_Z13)
|
|
|
d8307d |
|
|
|
d8307d |
-# define strncpy __strncpy_c
|
|
|
d8307d |
-# undef libc_hidden_builtin_def
|
|
|
d8307d |
-# define libc_hidden_builtin_def(name) strong_alias(__strncpy_c, __GI_strncpy)
|
|
|
d8307d |
-#endif /* HAVE_S390_VX_ASM_SUPPORT && IS_IN (libc) */
|
|
|
d8307d |
+# if ! HAVE_STRNCPY_IFUNC
|
|
|
d8307d |
+strong_alias (STRNCPY_Z13, strncpy)
|
|
|
d8307d |
+# endif
|
|
|
d8307d |
|
|
|
d8307d |
-/* Include strncpy-implementation in s390-32/s390-64 subdirectory. */
|
|
|
d8307d |
-#include <strncpy.S>
|
|
|
d8307d |
+# if ! HAVE_STRNCPY_Z900_G5 && defined SHARED && IS_IN (libc)
|
|
|
d8307d |
+strong_alias (STRNCPY_Z13, __GI_strncpy)
|
|
|
d8307d |
+# endif
|
|
|
d8307d |
+#endif
|
|
|
d8307d |
diff --git a/sysdeps/s390/multiarch/strncpy.c b/sysdeps/s390/strncpy.c
|
|
|
d8307d |
similarity index 71%
|
|
|
d8307d |
rename from sysdeps/s390/multiarch/strncpy.c
|
|
|
d8307d |
rename to sysdeps/s390/strncpy.c
|
|
|
d8307d |
index 2d4c456d96dad0d6..ec8a26471b6536e8 100644
|
|
|
d8307d |
--- a/sysdeps/s390/multiarch/strncpy.c
|
|
|
d8307d |
+++ b/sysdeps/s390/strncpy.c
|
|
|
d8307d |
@@ -16,7 +16,9 @@
|
|
|
d8307d |
License along with the GNU C Library; if not, see
|
|
|
d8307d |
<http://www.gnu.org/licenses/>. */
|
|
|
d8307d |
|
|
|
d8307d |
-#if defined HAVE_S390_VX_ASM_SUPPORT && IS_IN (libc)
|
|
|
d8307d |
+#include <ifunc-strncpy.h>
|
|
|
d8307d |
+
|
|
|
d8307d |
+#if HAVE_STRNCPY_IFUNC
|
|
|
d8307d |
# define strncpy __redirect_strncpy
|
|
|
d8307d |
/* Omit the strncpy inline definitions because it would redefine strncpy. */
|
|
|
d8307d |
# define __NO_STRING_INLINES
|
|
|
d8307d |
@@ -24,6 +26,17 @@
|
|
|
d8307d |
# undef strncpy
|
|
|
d8307d |
# include <ifunc-resolve.h>
|
|
|
d8307d |
|
|
|
d8307d |
-s390_vx_libc_ifunc2_redirected (__redirect_strncpy, __strncpy, strncpy);
|
|
|
d8307d |
+# if HAVE_STRNCPY_Z900_G5
|
|
|
d8307d |
+extern __typeof (__redirect_strncpy) STRNCPY_Z900_G5 attribute_hidden;
|
|
|
d8307d |
+# endif
|
|
|
d8307d |
+
|
|
|
d8307d |
+# if HAVE_STRNCPY_Z13
|
|
|
d8307d |
+extern __typeof (__redirect_strncpy) STRNCPY_Z13 attribute_hidden;
|
|
|
d8307d |
+# endif
|
|
|
d8307d |
|
|
|
d8307d |
+s390_libc_ifunc_expr (__redirect_strncpy, strncpy,
|
|
|
d8307d |
+ (HAVE_STRNCPY_Z13 && (hwcap & HWCAP_S390_VX))
|
|
|
d8307d |
+ ? STRNCPY_Z13
|
|
|
d8307d |
+ : STRNCPY_DEFAULT
|
|
|
d8307d |
+ )
|
|
|
d8307d |
#endif
|