/* * 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; ENDPROC(_memchr)