mirror of
https://sourceware.org/git/glibc.git
synced 2024-11-25 14:30:06 +00:00
76 lines
2.1 KiB
ArmAsm
76 lines
2.1 KiB
ArmAsm
/* Search a character in a block of memory. 31/64 bit S/390 version.
|
|
Copyright (C) 2001-2024 Free Software Foundation, Inc.
|
|
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
|