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-rw-r--r--libc/string/sh64/Makefile2
-rw-r--r--libc/string/sh64/strlen.S60
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
+