diff options
Diffstat (limited to 'arch/blackfin/lib/memchr.S')
| -rw-r--r-- | arch/blackfin/lib/memchr.S | 70 |
1 files changed, 70 insertions, 0 deletions
diff --git a/arch/blackfin/lib/memchr.S b/arch/blackfin/lib/memchr.S new file mode 100644 index 00000000000..498122250d0 --- /dev/null +++ b/arch/blackfin/lib/memchr.S @@ -0,0 +1,70 @@ +/* + * 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 |