diff options
Diffstat (limited to 'libc/string/sh64')
| -rw-r--r-- | libc/string/sh64/Makefile | 2 | ||||
| -rw-r--r-- | libc/string/sh64/strlen.S | 60 |
2 files changed, 61 insertions, 1 deletions
diff --git a/libc/string/sh64/Makefile b/libc/string/sh64/Makefile index da2c28416..5c82e083f 100644 --- a/libc/string/sh64/Makefile +++ b/libc/string/sh64/Makefile @@ -19,7 +19,7 @@ TOPDIR=../../../ include $(TOPDIR)Rules.mak -SSRC= memcpy.S memset.S strcpy.S +SSRC= memcpy.S memset.S strcpy.S strlen.S SOBJS=$(patsubst %.S,%.o, $(SSRC)) all: $(SOBJS) $(LIBC) diff --git a/libc/string/sh64/strlen.S b/libc/string/sh64/strlen.S new file mode 100644 index 000000000..57d15a29a --- /dev/null +++ b/libc/string/sh64/strlen.S @@ -0,0 +1,60 @@ +/* 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 + .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 + |