| 1 | /* Search a character in a block of memory. 31/64 bit S/390 version. |
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| 2 | Copyright (C) 2001-2022 Free Software Foundation, Inc. |
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| 3 | This file is part of the GNU C Library. |
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| 4 | |
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| 5 | The GNU C Library is free software; you can redistribute it and/or |
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| 6 | modify it under the terms of the GNU Lesser General Public |
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| 7 | License as published by the Free Software Foundation; either |
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| 8 | version 2.1 of the License, or (at your option) any later version. |
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| 9 | |
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| 10 | The GNU C Library is distributed in the hope that it will be useful, |
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| 11 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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| 13 | Lesser General Public License for more details. |
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| 14 | |
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| 15 | You should have received a copy of the GNU Lesser General Public |
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| 16 | License along with the GNU C Library; if not, see |
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| 17 | <https://www.gnu.org/licenses/>. */ |
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| 18 | |
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| 19 | /* INPUT PARAMETERS |
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| 20 | %r2 = address to memory area |
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| 21 | %r3 = character to find |
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| 22 | %r4 = number of bytes to search. */ |
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| 23 | |
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| 24 | #include <ifunc-memchr.h> |
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| 25 | #include "sysdep.h" |
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| 26 | #include "asm-syntax.h" |
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| 27 | |
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| 28 | #if HAVE_MEMCHR_Z900_G5 |
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| 29 | # if defined __s390x__ |
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| 30 | # define SLGR slgr |
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| 31 | # define LGHI lghi |
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| 32 | # define NGR ngr |
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| 33 | # define LGR lgr |
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| 34 | # else |
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| 35 | # define SLGR slr |
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| 36 | # define LGHI lhi |
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| 37 | # define NGR nr |
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| 38 | # define LGR lr |
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| 39 | # endif /* ! defined __s390x__ */ |
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| 40 | |
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| 41 | .text |
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| 42 | ENTRY(MEMCHR_Z900_G5) |
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| 43 | LGHI %r0,0xff |
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| 44 | NGR %r0,%r3 |
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| 45 | LGR %r1,%r2 |
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| 46 | # if ! defined __s390x__ |
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| 47 | tmlh %r4,32768 |
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| 48 | jo 3f /* Jump away if n >= 0x80000000 */ |
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| 49 | # endif |
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| 50 | la %r2,0(%r4,%r1) |
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| 51 | 0: srst %r2,%r1 |
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| 52 | jo 0b |
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| 53 | brc 13,1f |
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| 54 | SLGR %r2,%r2 |
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| 55 | 1: br %r14 |
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| 56 | # if ! defined __s390x__ |
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| 57 | /* On s390 (31bit), the pointer to the first byte after s (stored in |
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| 58 | r2) always wraps around with n >= 0x80000000 and can lead to stop |
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| 59 | searching before end of s. Thus just use r2=0 in this case. |
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| 60 | If r2 < r1, the srst instruction stops searching with cc=2 "not |
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| 61 | found" when wrapping around from top address to zero. */ |
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| 62 | 3: SLGR %r2,%r2 |
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| 63 | j 0b |
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| 64 | # endif |
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| 65 | END(MEMCHR_Z900_G5) |
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| 66 | |
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| 67 | # if ! HAVE_MEMCHR_IFUNC |
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| 68 | strong_alias (MEMCHR_Z900_G5, __memchr) |
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| 69 | weak_alias (__memchr, memchr) |
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| 70 | # endif |
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| 71 | |
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| 72 | # if defined SHARED && IS_IN (libc) |
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| 73 | strong_alias (MEMCHR_Z900_G5, __GI_memchr) |
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| 74 | # endif |
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| 75 | #endif |
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| 76 | |
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