| /* 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. |
| */ |
| |
| #include <features.h> |
| |
| .section .text..SHmedia32,"ax" |
| .globl 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 |
| |
| libc_hidden_def(strlen) |