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commit 07be392807ac78330da90f01408aa7e042a97a88
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Author: Stefan Liebler <stli@linux.ibm.com>
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Date: Tue Dec 18 13:57:05 2018 +0100
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S390: Implement bzero with memset.
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This patch removes the bzero s390 implementation with mvcle and
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adds entry points for bzero in memset ifunc variants.
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Therefore an ifunc resolver is implemented for bzero, too.
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ChangeLog:
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* sysdeps/s390/s390-32/bzero.S: Delete file.
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* sysdeps/s390/s390-64/bzero.S: Likewise.
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* sysdeps/s390/Makefile (sysdep_routines): Add bzero.
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* sysdeps/s390/bzero.c: New file.
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* sysdeps/s390/memset-z900.S: Add bzero entry points.
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* sysdeps/s390/ifunc-memset.h: Add bzero function macros.
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* sysdeps/s390/multiarch/ifunc-impl-list.c
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(__libc_ifunc_impl_list): Add bzero ifunc variants.
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diff --git a/sysdeps/s390/Makefile b/sysdeps/s390/Makefile
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index 360838e172f4ca37..e40e5bd982e54d89 100644
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--- a/sysdeps/s390/Makefile
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+++ b/sysdeps/s390/Makefile
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@@ -31,5 +31,5 @@ sysdeps-gconv-modules = ../sysdeps/s390/gconv-modules
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endif
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ifeq ($(subdir),string)
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-sysdep_routines += memset memset-z900
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+sysdep_routines += bzero memset memset-z900
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endif
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diff --git a/sysdeps/s390/s390-32/bzero.S b/sysdeps/s390/bzero.c
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similarity index 52%
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rename from sysdeps/s390/s390-32/bzero.S
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rename to sysdeps/s390/bzero.c
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index 897aa2154a861b7f..9f8d95781bf2fb68 100644
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--- a/sysdeps/s390/s390-32/bzero.S
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+++ b/sysdeps/s390/bzero.c
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@@ -1,7 +1,6 @@
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-/* bzero -- set a block of memory to zero. IBM S390 version
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+/* Multiple versions of bzero.
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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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- Copyright (C) 2000-2018 Free Software Foundation, Inc.
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- Contributed by Martin Schwidefsky (schwidefsky@de.ibm.com).
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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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@@ -17,26 +16,32 @@
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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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- * R2 = address to memory area
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- * R3 = number of bytes to fill
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- */
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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(__bzero)
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- ltr %r3,%r3
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- jz .L1
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- sr %r1,%r1 # set pad byte to zero
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- sr %r4,%r4 # no source for MVCLE, only a pad byte
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- sr %r5,%r5
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-.L0: mvcle %r2,%r4,0(%r1) # thats it, MVCLE is your friend
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- jo .L0
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-.L1: br %r14
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-END(__bzero)
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-
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-#ifndef NO_WEAK_ALIAS
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+#include <ifunc-memset.h>
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+#if HAVE_MEMSET_IFUNC
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+# include <string.h>
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+# include <ifunc-resolve.h>
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+
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+# if HAVE_MEMSET_Z900_G5
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+extern __typeof (__bzero) BZERO_Z900_G5 attribute_hidden;
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+# endif
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+
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+# if HAVE_MEMSET_Z10
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+extern __typeof (__bzero) BZERO_Z10 attribute_hidden;
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+# endif
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+
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+# if HAVE_MEMSET_Z196
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+extern __typeof (__bzero) BZERO_Z196 attribute_hidden;
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+# endif
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+
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+s390_libc_ifunc_expr (__bzero, __bzero,
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+ ({
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+ s390_libc_ifunc_init ();
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+ (HAVE_MEMSET_Z196 && S390_IS_Z196 (stfle_bits))
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+ ? BZERO_Z196
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+ : (HAVE_MEMSET_Z10 && S390_IS_Z10 (stfle_bits))
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+ ? BZERO_Z10
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+ : BZERO_DEFAULT;
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+ })
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+ )
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weak_alias (__bzero, bzero)
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#endif
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diff --git a/sysdeps/s390/ifunc-memset.h b/sysdeps/s390/ifunc-memset.h
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index 9a13b1001fed9979..32bc155f7e79fa26 100644
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--- a/sysdeps/s390/ifunc-memset.h
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+++ b/sysdeps/s390/ifunc-memset.h
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@@ -25,16 +25,19 @@
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#if defined HAVE_S390_MIN_Z196_ZARCH_ASM_SUPPORT
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# define MEMSET_DEFAULT MEMSET_Z196
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+# define BZERO_DEFAULT BZERO_Z196
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# define HAVE_MEMSET_Z900_G5 0
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# define HAVE_MEMSET_Z10 0
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# define HAVE_MEMSET_Z196 1
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#elif defined HAVE_S390_MIN_Z10_ZARCH_ASM_SUPPORT
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# define MEMSET_DEFAULT MEMSET_Z10
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+# define BZERO_DEFAULT BZERO_Z10
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# define HAVE_MEMSET_Z900_G5 0
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# define HAVE_MEMSET_Z10 1
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# define HAVE_MEMSET_Z196 HAVE_MEMSET_IFUNC
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#else
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# define MEMSET_DEFAULT MEMSET_Z900_G5
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+# define BZERO_DEFAULT BZERO_Z900_G5
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# define HAVE_MEMSET_Z900_G5 1
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# define HAVE_MEMSET_Z10 HAVE_MEMSET_IFUNC
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# define HAVE_MEMSET_Z196 HAVE_MEMSET_IFUNC
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@@ -48,18 +51,24 @@
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#if HAVE_MEMSET_Z900_G5
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# define MEMSET_Z900_G5 __memset_default
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+# define BZERO_Z900_G5 __bzero_default
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#else
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# define MEMSET_Z900_G5 NULL
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+# define BZERO_Z900_G5 NULL
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#endif
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#if HAVE_MEMSET_Z10
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# define MEMSET_Z10 __memset_z10
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+# define BZERO_Z10 __bzero_z10
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#else
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# define MEMSET_Z10 NULL
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+# define BZERO_Z10 NULL
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#endif
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#if HAVE_MEMSET_Z196
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# define MEMSET_Z196 __memset_z196
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+# define BZERO_Z196 __bzero_z196
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#else
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# define MEMSET_Z196 NULL
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+# define BZERO_Z196 NULL
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#endif
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diff --git a/sysdeps/s390/memset-z900.S b/sysdeps/s390/memset-z900.S
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index eaf13402bd3e251d..bfc659ae0b029eb4 100644
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--- a/sysdeps/s390/memset-z900.S
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+++ b/sysdeps/s390/memset-z900.S
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@@ -22,10 +22,14 @@
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#include "asm-syntax.h"
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#include <ifunc-memset.h>
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-/* INPUT PARAMETERS
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+/* INPUT PARAMETERS - MEMSET
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%r2 = address of memory area
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%r3 = byte to fill memory with
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- %r4 = number of bytes to fill. */
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+ %r4 = number of bytes to fill.
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+
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+ INPUT PARAMETERS - BZERO
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+ %r2 = address of memory area
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+ %r3 = number of bytes to fill. */
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.text
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@@ -44,7 +48,14 @@
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# define BRCTG brct
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# endif /* ! defined __s390x__ */
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+ENTRY(BZERO_Z900_G5)
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+ LGR %r4,%r3
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+ xr %r3,%r3
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+ j .L_Z900_G5_start
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+END(BZERO_Z900_G5)
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+
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ENTRY(MEMSET_Z900_G5)
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+.L_Z900_G5_start:
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#if defined __s390x__
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.machine "z900"
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#else
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@@ -90,7 +101,16 @@ END(MEMSET_Z900_G5)
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#endif /* HAVE_MEMSET_Z900_G5 */
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#if HAVE_MEMSET_Z10
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+ENTRY(BZERO_Z10)
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+ .machine "z10"
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+ .machinemode "zarch_nohighgprs"
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+ lgr %r4,%r3
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+ xr %r3,%r3
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+ j .L_Z10_start
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+END(BZERO_Z10)
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+
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ENTRY(MEMSET_Z10)
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+.L_Z10_start:
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.machine "z10"
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.machinemode "zarch_nohighgprs"
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# if !defined __s390x__
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@@ -122,7 +142,16 @@ END(MEMSET_Z10)
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#endif /* HAVE_MEMSET_Z10 */
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#if HAVE_MEMSET_Z196
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+ENTRY(BZERO_Z196)
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+ .machine "z196"
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+ .machinemode "zarch_nohighgprs"
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+ lgr %r4,%r3
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+ xr %r3,%r3
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+ j .L_Z196_start
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+END(BZERO_Z196)
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+
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ENTRY(MEMSET_Z196)
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+.L_Z196_start:
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.machine "z196"
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.machinemode "zarch_nohighgprs"
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# if !defined __s390x__
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@@ -177,6 +206,10 @@ END(__memset_mvcle)
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/* If we don't use ifunc, define an alias for memset here.
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Otherwise see sysdeps/s390/memset.c. */
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strong_alias (MEMSET_DEFAULT, memset)
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+/* Same for bzero. If ifunc is used, see
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+ sysdeps/s390/bzero.c. */
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+strong_alias (BZERO_DEFAULT, __bzero)
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+weak_alias (__bzero, bzero)
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#endif
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#if defined SHARED && IS_IN (libc)
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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 2f671eac1f4f1ffd..253f36045b57cc3c 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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@@ -59,6 +59,21 @@ __libc_ifunc_impl_list (const char *name, struct libc_ifunc_impl *array,
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# endif
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# if HAVE_MEMSET_Z900_G5
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IFUNC_IMPL_ADD (array, i, memset, 1, MEMSET_Z900_G5)
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+# endif
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+ )
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+
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+ /* Note: bzero is implemented in memset. */
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+ IFUNC_IMPL (i, name, bzero,
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+# if HAVE_MEMSET_Z196
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+ IFUNC_IMPL_ADD (array, i, bzero,
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+ S390_IS_Z196 (stfle_bits), BZERO_Z196)
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+# endif
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+# if HAVE_MEMSET_Z10
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+ IFUNC_IMPL_ADD (array, i, bzero,
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+ S390_IS_Z10 (stfle_bits), BZERO_Z10)
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+# endif
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+# if HAVE_MEMSET_Z900_G5
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+ IFUNC_IMPL_ADD (array, i, bzero, 1, BZERO_Z900_G5)
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# endif
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)
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#endif /* HAVE_MEMSET_IFUNC */
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diff --git a/sysdeps/s390/s390-64/bzero.S b/sysdeps/s390/s390-64/bzero.S
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deleted file mode 100644
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index b3216652985cc239..0000000000000000
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--- a/sysdeps/s390/s390-64/bzero.S
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+++ /dev/null
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@@ -1,41 +0,0 @@
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-/* bzero -- set a block of memory to zero. 64 bit S/390 version.
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bdc76f |
- 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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bdc76f |
- 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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bdc76f |
- 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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bdc76f |
-
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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 memory area
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- %r3 = number of bytes to fill. */
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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(__bzero)
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- ltgr %r3,%r3
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- jz .L1
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- sgr %r1,%r1 # set pad byte to zero
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- sgr %r4,%r4 # no source for MVCLE, only a pad byte
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- sgr %r5,%r5
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-.L0: mvcle %r2,%r4,0(%r1) # thats it, MVCLE is your friend
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- jo .L0
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-.L1: br %r14
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-END(__bzero)
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-
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-#ifndef NO_WEAK_ALIAS
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-weak_alias (__bzero, bzero)
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-#endif
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