/* Set a block of memory to some byte value.  31/64 bit S/390 version.

   Copyright (C) 2001-2018 Free Software Foundation, Inc.

   Contributed by Martin Schwidefsky (schwidefsky@de.ibm.com).

   This file is part of the GNU C Library.

   The GNU C Library is free software; you can redistribute it and/or

   modify it under the terms of the GNU Lesser General Public

   License as published by the Free Software Foundation; either

   version 2.1 of the License, or (at your option) any later version.

   The GNU C Library is distributed in the hope that it will be useful,

   but WITHOUT ANY WARRANTY; without even the implied warranty of

   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

   Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public

   License along with the GNU C Library; if not, see

   <http://www.gnu.org/licenses/>.  */

#include <sysdep.h>

#include "asm-syntax.h"

#include <ifunc-memset.h>

/* INPUT PARAMETERS - MEMSET

     %r2 = address of memory area

     %r3 = byte to fill memory with

     %r4 = number of bytes to fill.

   INPUT PARAMETERS - BZERO

     %r2 = address of memory area

     %r3 = number of bytes to fill.  */

       .text

#if HAVE_MEMSET_Z900_G5

# if defined __s390x__

#  define LTGR	ltgr

#  define CGHI	cghi

#  define LGR	lgr

#  define AGHI	aghi

#  define BRCTG	brctg

# else

#  define LTGR	ltr

#  define CGHI	chi

#  define LGR	lr

#  define AGHI	ahi

#  define BRCTG	brct

# endif /* ! defined __s390x__  */

ENTRY(BZERO_Z900_G5)

	LGR	%r4,%r3

	xr	%r3,%r3

	j	.L_Z900_G5_start

END(BZERO_Z900_G5)

ENTRY(MEMSET_Z900_G5)

.L_Z900_G5_start:

#if defined __s390x__

	.machine "z900"

#else

	.machine "g5"

#endif /* ! defined __s390x__  */

	LTGR    %r4,%r4

	je      .L_Z900_G5_4

	stc     %r3,0(%r2)

	CGHI    %r4,1

	LGR     %r1,%r2

	je      .L_Z900_G5_4

	AGHI    %r4,-2

#if defined __s390x__

	larl    %r5,.L_Z900_G5_18

	srlg    %r3,%r4,8

# define Z900_G5_EX_D 0

#else

	basr    %r5,0

.L_Z900_G5_19:

# define Z900_G5_EX_D .L_Z900_G5_18-.L_Z900_G5_19

	lr      %r3,%r4

	srl     %r3,8

#endif /* ! defined __s390x__  */

	LTGR    %r3,%r3

	jne     .L_Z900_G5_14

.L_Z900_G5_3:

	ex      %r4,Z900_G5_EX_D(%r5)

.L_Z900_G5_4:

	br      %r14

.L_Z900_G5_14:

	mvc     1(256,%r1),0(%r1)

	la      %r1,256(%r1)

	BRCTG   %r3,.L_Z900_G5_14

	j       .L_Z900_G5_3

.L_Z900_G5_18:

	mvc     1(1,%r1),0(%r1)

END(MEMSET_Z900_G5)

# undef LTGR

# undef CGHI

# undef LGR

# undef AGHI

# undef BRCTG

#endif /*  HAVE_MEMSET_Z900_G5  */

#if HAVE_MEMSET_Z10

ENTRY(BZERO_Z10)

	.machine "z10"

	.machinemode "zarch_nohighgprs"

	lgr	%r4,%r3

	xr	%r3,%r3

	j	.L_Z10_start

END(BZERO_Z10)

ENTRY(MEMSET_Z10)

.L_Z10_start:

	.machine "z10"

	.machinemode "zarch_nohighgprs"

# if !defined __s390x__

	llgfr	%r4,%r4

# endif /* !defined __s390x__  */

	cgije   %r4,0,.L_Z10_4

	stc     %r3,0(%r2)

	lgr     %r1,%r2

	cgije   %r4,1,.L_Z10_4

	aghi    %r4,-2

	srlg    %r5,%r4,8

	cgijlh  %r5,0,.L_Z10_15

.L_Z10_3:

	exrl    %r4,.L_Z10_18

.L_Z10_4:

	br      %r14

.L_Z10_15:

	cgfi	%r5,163840          # Switch to mvcle for >40MB

	jh	__memset_mvcle

.L_Z10_14:

	pfd     2,1024(%r1)

	mvc     1(256,%r1),0(%r1)

	la      %r1,256(%r1)

	brctg   %r5,.L_Z10_14

	j       .L_Z10_3

.L_Z10_18:

	mvc     1(1,%r1),0(%r1)

END(MEMSET_Z10)

#endif /* HAVE_MEMSET_Z10  */

#if HAVE_MEMSET_Z196

ENTRY(BZERO_Z196)

	.machine "z196"

	.machinemode "zarch_nohighgprs"

	lgr	%r4,%r3

	xr	%r3,%r3

	j	.L_Z196_start

END(BZERO_Z196)

ENTRY(MEMSET_Z196)

.L_Z196_start:

	.machine "z196"

	.machinemode "zarch_nohighgprs"

# if !defined __s390x__

	llgfr	%r4,%r4

# endif /* !defined __s390x__  */

	ltgr    %r4,%r4

	je      .L_Z196_4

	stc     %r3,0(%r2)

	lgr     %r1,%r2

	cghi    %r4,1

	je      .L_Z196_4

	aghi    %r4,-2

	srlg    %r5,%r4,8

	ltgr    %r5,%r5

	jne     .L_Z196_1

.L_Z196_3:

	exrl    %r4,.L_Z196_17

.L_Z196_4:

	br      %r14

.L_Z196_1:

	cgfi	%r5,1048576

	jh	__memset_mvcle	   # Switch to mvcle for >256MB

.L_Z196_2:

	pfd     2,1024(%r1)

	mvc     1(256,%r1),0(%r1)

	aghi    %r5,-1

	la      %r1,256(%r1)

	jne     .L_Z196_2

	j       .L_Z196_3

.L_Z196_17:

	mvc     1(1,%r1),0(%r1)

END(MEMSET_Z196)

#endif /* HAVE_MEMSET_Z196  */

#if HAVE_MEMSET_MVCLE

ENTRY(__memset_mvcle)

	aghi	%r4,2               # take back the change done by the caller

	lgr	%r0,%r2		    # save source address

	lgr	%r1,%r3		    # move pad byte to R1

	lgr	%r3,%r4             # move length to r3

	sgr	%r4,%r4		    # no source for MVCLE, only a pad byte

	sgr	%r5,%r5

.L0:	mvcle	%r2,%r4,0(%r1)	    # thats it, MVCLE is your friend

	jo	.L0

	lgr	%r2,%r0		    # return value is source address

.L1:

	br	%r14

END(__memset_mvcle)

#endif /* HAVE_MEMSET_MVCLE  */

#if ! HAVE_MEMSET_IFUNC

/* If we don't use ifunc, define an alias for memset here.

   Otherwise see sysdeps/s390/memset.c.  */

strong_alias (MEMSET_DEFAULT, memset)

/* Same for bzero.  If ifunc is used, see

   sysdeps/s390/bzero.c.  */

strong_alias (BZERO_DEFAULT, __bzero)

weak_alias (__bzero, bzero)

#endif

#if defined SHARED && IS_IN (libc)

/* Defines the internal symbol.

   Compare to libc_hidden_builtin_def (memset) in string/memset.c.  */

strong_alias (MEMSET_DEFAULT, __GI_memset)

#endif