1/*
2 * File:         arch/blackfin/lib/memchr.S
3 * Based on:
4 * Author:
5 *
6 * Created:
7 * Description:
8 *
9 * Modified:
10 *               Copyright 2004-2006 Analog Devices Inc.
11 *
12 * Bugs:         Enter bugs at http://blackfin.uclinux.org/
13 *
14 * This program is free software; you can redistribute it and/or modify
15 * it under the terms of the GNU General Public License as published by
16 * the Free Software Foundation; either version 2 of the License, or
17 * (at your option) any later version.
18 *
19 * This program is distributed in the hope that it will be useful,
20 * but WITHOUT ANY WARRANTY; without even the implied warranty of
21 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
22 * GNU General Public License for more details.
23 *
24 * You should have received a copy of the GNU General Public License
25 * along with this program; if not, see the file COPYING, or write
26 * to the Free Software Foundation, Inc.,
27 * 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
28 */
29
30#include <linux/linkage.h>
31
32/* void *memchr(const void *s, int c, size_t n);
33 * R0 = address (s)
34 * R1 = sought byte (c)
35 * R2 = count (n)
36 *
37 * Returns pointer to located character.
38 */
39
40.text
41
42.align 2
43
44ENTRY(_memchr)
45	P0 = R0;		/* P0 = address */
46	P2 = R2;		/* P2 = count */
47	R1 = R1.B(Z);
48	CC = R2 == 0;
49	IF CC JUMP .Lfailed;
50
51.Lbytes:
52	LSETUP (.Lbyte_loop_s, .Lbyte_loop_e) LC0=P2;
53
54.Lbyte_loop_s:
55	R3 = B[P0++](Z);
56	CC = R3 == R1;
57	IF CC JUMP .Lfound;
58.Lbyte_loop_e:
59	NOP;
60
61.Lfailed:
62	R0=0;
63	RTS;
64
65.Lfound:
66	R0 = P0;
67	R0 += -1;
68	RTS;
69
70ENDPROC(_memchr)
71