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@@ -0,0 +1,60 @@
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+/* vi: set sw=8 ts=8: */
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+/*
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+ * libc/string/sh64/strlen.S
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+ *
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+ * Simplistic strlen() implementation for SHmedia.
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+ *
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+ * Copyright (C) 2003 Paul Mundt <lethal@linux-sh.org>
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+ *
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+ * All rights reserved.
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+ *
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+ * Redistribution and use in source and binary forms, with or without
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+ * modification, are permitted provided that the following conditions
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+ * are met:
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+ * 1. Redistributions of source code must retain the above copyright
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+ * notice, this list of conditions and the following disclaimer.
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+ * 2. The name of the above contributors may not be
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+ * used to endorse or promote products derived from this software
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+ * without specific prior written permission.
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+ *
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+ * THIS SOFTWARE IS PROVIDED BY THE CONTRIBUTORS ``AS IS'' AND
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+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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+ * ARE DISCLAIMED. IN NO EVENT SHALL THE CONTRIBUTORS BE LIABLE
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+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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+ * SUCH DAMAGE.
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+ */
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+
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+ .section .text..SHmedia32,"ax"
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+ .globl strlen
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+ .type strlen,@function
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+
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+ .balign 16
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+strlen:
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+ ptabs r18, tr4
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+
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+ /*
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+ * Note: We could easily deal with the NULL case here with a simple
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+ * sanity check, though it seems that the behavior we want is to fault
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+ * in the event that r2 == NULL, so we don't bother.
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+ */
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+/* beqi r2, 0, tr4 */ ! Sanity check
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+
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+ movi -1, r0
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+ pta/l loop, tr0
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+loop:
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+ ld.b r2, 0, r1
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+ addi r2, 1, r2
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+ addi r0, 1, r0
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+ bnei/l r1, 0, tr0
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+
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+ or r0, r63, r2
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+ blink tr4, r63
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+
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+ .size strlen, . - strlen
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+
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Eric Andersen