/* vi: set sw=8 ts=8: */ /* * libc/string/sh64/strlen.S * * Simplistic strlen() implementation for SHmedia. * * Copyright (C) 2003 Paul Mundt <lethal@linux-sh.org> * * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. The name of the above contributors may not be * used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. */ .section .text..SHmedia32,"ax" .globl strlen .set strlen,__strlen .globl __strlen .hidden __strlen .type __strlen,@function .balign 16 __strlen: ptabs r18, tr4 /* * Note: We could easily deal with the NULL case here with a simple * sanity check, though it seems that the behavior we want is to fault * in the event that r2 == NULL, so we don't bother. */ /* beqi r2, 0, tr4 */ ! Sanity check movi -1, r0 pta/l loop, tr0 loop: ld.b r2, 0, r1 addi r2, 1, r2 addi r0, 1, r0 bnei/l r1, 0, tr0 or r0, r63, r2 blink tr4, r63 .size __strlen,.-__strlen