mirror of git://sourceware.org/git/glibc.git
S390: Refactor strncpy ifunc handling.
The ifunc handling for strncpy is adjusted in order to omit ifunc variants if those will never be used as the minimum architecture level already supports newer CPUs by default. Glibc internal calls will then also use the "newer" ifunc variant. Note: The fallback s390-32/s390-64 ifunc variants are now moved to the strncpy-z900.S files. The s390-32/s390-64 files multiarch/strncpy.c and strncpy.S are deleted. ChangeLog: * sysdeps/s390/multiarch/Makefile (sysdep_routines): Remove strncpy variants. * sysdeps/s390/Makefile (sysdep_routines): Add strncpy variants. * sysdeps/s390/multiarch/ifunc-impl-list.c (__libc_ifunc_impl_list): Refactor ifunc handling for strncpy. * sysdeps/s390/multiarch/strncpy-vx.S: Move to ... * sysdeps/s390/strncpy-vx.S: ... here and adjust ifunc handling. * sysdeps/s390/multiarch/strncpy.c: Move to ... * sysdeps/s390/strncpy.c: ... here and adjust ifunc handling. * sysdeps/s390/ifunc-strncpy.h: New file. * sysdeps/s390/s390-64/strncpy.S: Move to ... * sysdeps/s390/s390-64/strncpy-z900.S: ... here and adjust ifunc handling. * sysdeps/s390/s390-32/strncpy.S: Move to ... * sysdeps/s390/s390-32/strncpy-z900.S: ... here and adjust ifunc handling. * sysdeps/s390/s390-32/multiarch/strncpy.c: Delete file. * sysdeps/s390/s390-64/multiarch/strncpy.c: Likewise.
This commit is contained in:
Stefan Liebler
parent
970449311d
commit
d1bdbf3809
21
ChangeLog
21
ChangeLog
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@ -1,3 +1,24 @@
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2018-12-18 Stefan Liebler <stli@linux.ibm.com>
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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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2018-12-18 Stefan Liebler <stli@linux.ibm.com>
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* sysdeps/s390/multiarch/Makefile
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@ -63,5 +63,6 @@ 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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@ -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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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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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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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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#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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#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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#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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#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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#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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@ -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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@ -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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#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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@ -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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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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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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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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/* 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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@ -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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# if ! HAVE_STRNCPY_IFUNC
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strong_alias (STRNCPY_Z900_G5, strncpy)
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# endif
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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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@ -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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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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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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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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/* 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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@ -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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#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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stg %r2,48(%r15) # save dst pointer
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slgr %r2,%r3 # %r3 points to src, %r2+%r3 to dst
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@ -86,5 +88,13 @@ ENTRY(strncpy)
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jo .L13
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.Lexit: lg %r2,48(%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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# if ! HAVE_STRNCPY_IFUNC
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strong_alias (STRNCPY_Z900_G5, strncpy)
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# endif
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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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@ -16,13 +16,13 @@
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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-strncpy.h>
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#include "sysdep.h"
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#include "asm-syntax.h"
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.text
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#if HAVE_STRNCPY_Z13
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/* char * strncpy (const char *dest, const char *src, size_t n)
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Copy at most n characters of string src to dest.
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@ -40,7 +40,7 @@
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-v18=part of src
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-v31=register save area for r6, r7
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*/
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ENTRY(__strncpy_vx)
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ENTRY(STRNCPY_Z13)
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.machine "z13"
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.machinemode "zarch_nohighgprs"
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@ -196,12 +196,13 @@ ENTRY(__strncpy_vx)
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vl %v16,0(%r5,%r3) /* Load s. */
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j .Llt64
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END(__strncpy_vx)
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END(STRNCPY_Z13)
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# define strncpy __strncpy_c
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# undef libc_hidden_builtin_def
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# define libc_hidden_builtin_def(name) strong_alias(__strncpy_c, __GI_strncpy)
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#endif /* HAVE_S390_VX_ASM_SUPPORT && IS_IN (libc) */
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# if ! HAVE_STRNCPY_IFUNC
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strong_alias (STRNCPY_Z13, strncpy)
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# endif
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/* Include strncpy-implementation in s390-32/s390-64 subdirectory. */
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#include <strncpy.S>
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# if ! HAVE_STRNCPY_Z900_G5 && defined SHARED && IS_IN (libc)
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strong_alias (STRNCPY_Z13, __GI_strncpy)
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# endif
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#endif
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@ -16,7 +16,9 @@
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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-strncpy.h>
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#if HAVE_STRNCPY_IFUNC
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# define strncpy __redirect_strncpy
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/* Omit the strncpy inline definitions because it would redefine strncpy. */
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# define __NO_STRING_INLINES
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@ -24,6 +26,17 @@
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# undef strncpy
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# include <ifunc-resolve.h>
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s390_vx_libc_ifunc2_redirected (__redirect_strncpy, __strncpy, strncpy);
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# if HAVE_STRNCPY_Z900_G5
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extern __typeof (__redirect_strncpy) STRNCPY_Z900_G5 attribute_hidden;
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# endif
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# if HAVE_STRNCPY_Z13
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extern __typeof (__redirect_strncpy) STRNCPY_Z13 attribute_hidden;
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# endif
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s390_libc_ifunc_expr (__redirect_strncpy, strncpy,
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(HAVE_STRNCPY_Z13 && (hwcap & HWCAP_S390_VX))
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? STRNCPY_Z13
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: STRNCPY_DEFAULT
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)
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#endif
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