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/* Search a character in a block of memory. 31/64 bit S/390 version.
Copyright (C) 2001-2021 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
<https://www.gnu.org/licenses/>. */
/* INPUT PARAMETERS
%r2 = address to memory area
%r3 = character to find
%r4 = number of bytes to search. */
#include <ifunc-memchr.h>
#include "sysdep.h"
#include "asm-syntax.h"
#if HAVE_MEMCHR_Z900_G5
# if defined __s390x__
# define SLGR slgr
# define LGHI lghi
# define NGR ngr
# define LGR lgr
# else
# define SLGR slr
# define LGHI lhi
# define NGR nr
# define LGR lr
# endif /* ! defined __s390x__ */
.text
ENTRY(MEMCHR_Z900_G5)
LGHI %r0,0xff
NGR %r0,%r3
LGR %r1,%r2
# if ! defined __s390x__
tmlh %r4,32768
jo 3f /* Jump away if n >= 0x80000000 */
# endif
la %r2,0(%r4,%r1)
0: srst %r2,%r1
jo 0b
brc 13,1f
SLGR %r2,%r2
1: br %r14
# if ! defined __s390x__
/* On s390 (31bit), the pointer to the first byte after s (stored in
r2) always wraps around with n >= 0x80000000 and can lead to stop
searching before end of s. Thus just use r2=0 in this case.
If r2 < r1, the srst instruction stops searching with cc=2 "not
found" when wrapping around from top address to zero. */
3: SLGR %r2,%r2
j 0b
# endif
END(MEMCHR_Z900_G5)
# if ! HAVE_MEMCHR_IFUNC
strong_alias (MEMCHR_Z900_G5, __memchr)
weak_alias (__memchr, memchr)
# endif
# if defined SHARED && IS_IN (libc)
strong_alias (MEMCHR_Z900_G5, __GI_memchr)
# endif
#endif
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