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/*
* File: arch/blackfin/lib/memchr.S
* Based on:
* Author:
*
* Created:
* Description:
*
* Modified:
* Copyright 2004-2006 Analog Devices Inc.
*
* Bugs: Enter bugs at http://blackfin.uclinux.org/
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, see the file COPYING, or write
* to the Free Software Foundation, Inc.,
* 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include <linux/linkage.h>
/* void *memchr(const void *s, int c, size_t n);
* R0 = address (s)
* R1 = sought byte (c)
* R2 = count (n)
*
* Returns pointer to located character.
*/
.text
.align 2
ENTRY(_memchr)
P0 = R0; /* P0 = address */
P2 = R2; /* P2 = count */
R1 = R1.B(Z);
CC = R2 == 0;
IF CC JUMP .Lfailed;
.Lbytes:
LSETUP (.Lbyte_loop_s, .Lbyte_loop_e) LC0=P2;
.Lbyte_loop_s:
R3 = B[P0++](Z);
CC = R3 == R1;
IF CC JUMP .Lfound;
.Lbyte_loop_e:
NOP;
.Lfailed:
R0=0;
RTS;
.Lfound:
R0 = P0;
R0 += -1;
RTS;
.size _memchr,.-_memchr
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