forked from rpms/glibc
395 lines
13 KiB
Diff
395 lines
13 KiB
Diff
commit cdab85fe33b0443a645509cbb5b929a0d3307f18
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Author: Stefan Liebler <stli@linux.ibm.com>
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Date: Tue Dec 18 13:57:13 2018 +0100
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S390: Refactor strcmp ifunc handling.
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The ifunc handling for strcmp 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 with clst instruction
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are now moved to the unified strcmp-z900.S file which can be used for
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31/64bit. The s390-32/s390-64 files multiarch/strcmp.c and strcmp.S
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are deleted.
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ChangeLog:
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* sysdeps/s390/multiarch/Makefile
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(sysdep_routines): Remove strcmp variants.
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* sysdeps/s390/Makefile (sysdep_routines): Add strcmp variants.
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* sysdeps/s390/multiarch/ifunc-impl-list.c
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(__libc_ifunc_impl_list): Refactor ifunc handling for strcmp.
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* sysdeps/s390/multiarch/strcmp-vx.S: Move to ...
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* sysdeps/s390/strcmp-vx.S: ... here and adjust ifunc handling.
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* sysdeps/s390/multiarch/strcmp.c: Move to ...
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* sysdeps/s390/strcmp.c: ... here and adjust ifunc handling.
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* sysdeps/s390/ifunc-strcmp.h: New file.
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* sysdeps/s390/s390-64/strcmp.S: Move to ...
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* sysdeps/s390/strcmp-z900.S: ... here and adjust to be usable
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for 31/64bit and ifunc handling.
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* sysdeps/s390/s390-32/multiarch/strcmp.c: Delete file.
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* sysdeps/s390/s390-64/multiarch/strcmp.c: Likewise.
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* sysdeps/s390/s390-32/strcmp.S: Likewise.
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diff --git a/sysdeps/s390/Makefile b/sysdeps/s390/Makefile
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index cb5dc1d4f95fd11c..71a4658b43aeb745 100644
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--- a/sysdeps/s390/Makefile
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+++ b/sysdeps/s390/Makefile
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@@ -44,5 +44,6 @@ sysdep_routines += bzero memset memset-z900 \
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strncpy strncpy-vx strncpy-z900 \
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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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+ strncat strncat-vx strncat-c \
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+ strcmp strcmp-vx strcmp-z900
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endif
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diff --git a/sysdeps/s390/ifunc-strcmp.h b/sysdeps/s390/ifunc-strcmp.h
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new file mode 100644
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index 0000000000000000..86ffe686ade52b64
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--- /dev/null
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+++ b/sysdeps/s390/ifunc-strcmp.h
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@@ -0,0 +1,52 @@
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+/* strcmp 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_STRCMP_IFUNC 1
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+#else
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+# define HAVE_STRCMP_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_STRCMP_IFUNC_AND_VX_SUPPORT HAVE_STRCMP_IFUNC
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+#else
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+# define HAVE_STRCMP_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 STRCMP_DEFAULT STRCMP_Z13
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+# define HAVE_STRCMP_Z900_G5 0
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+# define HAVE_STRCMP_Z13 1
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+#else
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+# define STRCMP_DEFAULT STRCMP_Z900_G5
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+# define HAVE_STRCMP_Z900_G5 1
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+# define HAVE_STRCMP_Z13 HAVE_STRCMP_IFUNC_AND_VX_SUPPORT
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+#endif
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+
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+#if HAVE_STRCMP_Z900_G5
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+# define STRCMP_Z900_G5 __strcmp_default
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+#else
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+# define STRCMP_Z900_G5 NULL
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+#endif
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+
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+#if HAVE_STRCMP_Z13
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+# define STRCMP_Z13 __strcmp_vx
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+#else
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+# define STRCMP_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 24be3eac5131fd4a..97421a499625c7f2 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 += strcmp strcmp-vx \
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- strncmp strncmp-vx strncmp-c \
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+sysdep_routines += strncmp strncmp-vx strncmp-c \
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strchr strchr-vx strchr-c \
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strchrnul strchrnul-vx strchrnul-c \
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strrchr strrchr-vx strrchr-c \
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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 3abcaf08e0ccd385..44637c431b144c66 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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@@ -34,6 +34,7 @@
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#include <ifunc-stpncpy.h>
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#include <ifunc-strcat.h>
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#include <ifunc-strncat.h>
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+#include <ifunc-strcmp.h>
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/* Maximum number of IFUNC implementations. */
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#define MAX_IFUNC 3
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@@ -268,6 +269,18 @@ __libc_ifunc_impl_list (const char *name, struct libc_ifunc_impl *array,
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)
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#endif /* HAVE_STRNCAT_IFUNC */
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+#if HAVE_STRCMP_IFUNC
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+ IFUNC_IMPL (i, name, strcmp,
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+# if HAVE_STRCMP_Z13
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+ IFUNC_IMPL_ADD (array, i, strcmp,
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+ dl_hwcap & HWCAP_S390_VX, STRCMP_Z13)
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+# endif
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+# if HAVE_STRCMP_Z900_G5
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+ IFUNC_IMPL_ADD (array, i, strcmp, 1, STRCMP_Z900_G5)
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+# endif
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+ )
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+#endif /* HAVE_STRCMP_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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@@ -292,7 +305,6 @@ __libc_ifunc_impl_list (const char *name, struct libc_ifunc_impl *array,
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IFUNC_VX_IMPL (wcsncat);
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- IFUNC_VX_IMPL (strcmp);
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IFUNC_VX_IMPL (wcscmp);
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IFUNC_VX_IMPL (strncmp);
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diff --git a/sysdeps/s390/s390-32/multiarch/strcmp.c b/sysdeps/s390/s390-32/multiarch/strcmp.c
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deleted file mode 100644
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index d06b0f3436b2abfd..0000000000000000
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--- a/sysdeps/s390/s390-32/multiarch/strcmp.c
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+++ /dev/null
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@@ -1,21 +0,0 @@
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-/* Multiple versions of strcmp.
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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]/strcmp.S will be used. */
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-#include <sysdeps/s390/multiarch/strcmp.c>
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diff --git a/sysdeps/s390/s390-32/strcmp.S b/sysdeps/s390/s390-32/strcmp.S
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deleted file mode 100644
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index 3cf3f239fddccce8..0000000000000000
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--- a/sysdeps/s390/s390-32/strcmp.S
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+++ /dev/null
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@@ -1,41 +0,0 @@
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-/* strcmp - compare two string. S/390 version.
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- This file is part of the GNU C Library.
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- Copyright (C) 2001-2018 Free Software Foundation, Inc.
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- Contributed by Martin Schwidefsky (schwidefsky@de.ibm.com).
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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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-/* INPUT PARAMETERS
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- %r2 = address of string 1
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- %r3 = address of string 2. */
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-
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-#include "sysdep.h"
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-#include "asm-syntax.h"
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-
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- .text
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-ENTRY(strcmp)
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- slr %r0,%r0
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-0: clst %r2,%r3
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- jo 0b
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- jp 1f
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- jm 2f
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- slr %r2,%r2
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- br %r14
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-1: lhi %r2,1
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- br %r14
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-2: lhi %r2,-1
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- br %r14
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-END(strcmp)
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-libc_hidden_builtin_def (strcmp)
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diff --git a/sysdeps/s390/s390-64/multiarch/strcmp.c b/sysdeps/s390/s390-64/multiarch/strcmp.c
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deleted file mode 100644
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index d06b0f3436b2abfd..0000000000000000
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--- a/sysdeps/s390/s390-64/multiarch/strcmp.c
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+++ /dev/null
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@@ -1,21 +0,0 @@
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-/* Multiple versions of strcmp.
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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]/strcmp.S will be used. */
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-#include <sysdeps/s390/multiarch/strcmp.c>
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diff --git a/sysdeps/s390/multiarch/strcmp-vx.S b/sysdeps/s390/strcmp-vx.S
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similarity index 90%
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rename from sysdeps/s390/multiarch/strcmp-vx.S
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rename to sysdeps/s390/strcmp-vx.S
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index bcaeb564d47c58ff..801ad9d32bbd76c0 100644
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--- a/sysdeps/s390/multiarch/strcmp-vx.S
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+++ b/sysdeps/s390/strcmp-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-strcmp.h>
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+#if HAVE_STRCMP_Z13
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# include "sysdep.h"
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# include "asm-syntax.h"
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@@ -36,7 +37,7 @@
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-v17=part of s2
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-v18=index of unequal
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*/
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-ENTRY(__strcmp_vx)
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+ENTRY(STRCMP_Z13)
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.machine "z13"
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.machinemode "zarch_nohighgprs"
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@@ -106,11 +107,13 @@ ENTRY(__strcmp_vx)
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.Lend_equal:
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lghi %r2,0
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br %r14
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-END(__strcmp_vx)
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+END(STRCMP_Z13)
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-# define strcmp __strcmp_c
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-# undef libc_hidden_builtin_def
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-# define libc_hidden_builtin_def(name) strong_alias(__strcmp_c, __GI_strcmp)
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-#endif /* HAVE_S390_VX_ASM_SUPPORT && IS_IN (libc) */
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+# if ! HAVE_STRCMP_IFUNC
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+strong_alias (STRCMP_Z13, strcmp)
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+# endif
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-#include <strcmp.S>
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+# if ! HAVE_STRCMP_Z900_G5 && defined SHARED && IS_IN (libc)
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+strong_alias (STRCMP_Z13, __GI_strcmp)
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+# endif
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+#endif
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diff --git a/sysdeps/s390/s390-64/strcmp.S b/sysdeps/s390/strcmp-z900.S
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similarity index 70%
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rename from sysdeps/s390/s390-64/strcmp.S
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rename to sysdeps/s390/strcmp-z900.S
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index 6cf1addd8bdf1a19..67b3c8b2e5989cd2 100644
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--- a/sysdeps/s390/s390-64/strcmp.S
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+++ b/sysdeps/s390/strcmp-z900.S
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@@ -21,21 +21,39 @@
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%r2 = address of string 1
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%r3 = address of string 2. */
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+#include <ifunc-strcmp.h>
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#include "sysdep.h"
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#include "asm-syntax.h"
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+#if HAVE_STRCMP_Z900_G5
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+# if defined __s390x__
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+# define SLGR slgr
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+# define LGHI lghi
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+# else
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+# define SLGR slr
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+# define LGHI lhi
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+# endif /* ! defined __s390x__ */
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+
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.text
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-ENTRY(strcmp)
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- slr %r0,%r0
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+ENTRY(STRCMP_Z900_G5)
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+ SLGR %r0,%r0
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0: clst %r2,%r3
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jo 0b
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jp 1f
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jm 2f
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- slgr %r2,%r2
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+ SLGR %r2,%r2
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br %r14
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-1: lghi %r2,1
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+1: LGHI %r2,1
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br %r14
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-2: lghi %r2,-1
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+2: LGHI %r2,-1
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br %r14
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-END(strcmp)
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-libc_hidden_builtin_def (strcmp)
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+END(STRCMP_Z900_G5)
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+
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+# if ! HAVE_STRCMP_IFUNC
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+strong_alias (STRCMP_Z900_G5, strcmp)
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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 (STRCMP_Z900_G5, __GI_strcmp)
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+# endif
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+#endif
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diff --git a/sysdeps/s390/multiarch/strcmp.c b/sysdeps/s390/strcmp.c
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similarity index 71%
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rename from sysdeps/s390/multiarch/strcmp.c
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rename to sysdeps/s390/strcmp.c
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index 7c8b17b3041dd549..9efa30acaf21f4e8 100644
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--- a/sysdeps/s390/multiarch/strcmp.c
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+++ b/sysdeps/s390/strcmp.c
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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-strcmp.h>
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+
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+#if HAVE_STRCMP_IFUNC
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# define strcmp __redirect_strcmp
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/* Omit the strcmp inline definitions because it would redefine strcmp. */
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# define __NO_STRING_INLINES
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@@ -24,6 +26,17 @@
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# include <ifunc-resolve.h>
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# undef strcmp
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-s390_vx_libc_ifunc2_redirected (__redirect_strcmp, __strcmp, strcmp)
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+# if HAVE_STRCMP_Z900_G5
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+extern __typeof (__redirect_strcmp) STRCMP_Z900_G5 attribute_hidden;
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+# endif
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+
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+# if HAVE_STRCMP_Z13
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+extern __typeof (__redirect_strcmp) STRCMP_Z13 attribute_hidden;
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+# endif
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+s390_libc_ifunc_expr (__redirect_strcmp, strcmp,
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+ (HAVE_STRCMP_Z13 && (hwcap & HWCAP_S390_VX))
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+ ? STRCMP_Z13
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+ : STRCMP_DEFAULT
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+ )
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#endif
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