[src/trunk]: src/common/lib/libc/arch/arm/string Add ARM assembly of strlcat ...

[matt <matt%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/950fb38578e5
branches:  trunk
changeset: 784253:950fb38578e5
user:      matt <matt%NetBSD.org@localhost>
date:      Wed Jan 23 07:02:45 2013 +0000

description:
Add ARM assembly of strlcat which is implemented using (the ARM optimized)
strnlen and strlcpy.

diffstat:

 common/lib/libc/arch/arm/string/strlcat_arm.S |  52 +++++++++++++++++++++++++++
 1 files changed, 52 insertions(+), 0 deletions(-)

diffs (56 lines):

diff -r 211fd2a97b0d -r 950fb38578e5 common/lib/libc/arch/arm/string/strlcat_arm.S
--- /dev/null   Thu Jan 01 00:00:00 1970 +0000
+++ b/common/lib/libc/arch/arm/string/strlcat_arm.S     Wed Jan 23 07:02:45 2013 +0000
@@ -0,0 +1,52 @@
+/*-
+ * Copyright (c) 2013 The NetBSD Foundation, Inc.
+ * All rights reserved.
+ *
+ * This code is derived from software contributed to The NetBSD Foundation
+ * by Matt Thomas of 3am Software Foundry.
+ *
+ * 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. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND 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 FOUNDATION OR 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 <machine/asm.h>
+
+RCSID("$NetBSD: strlcat_arm.S,v 1.1 2013/01/23 07:02:45 matt Exp $")
+
+/* LINTSTUB: size_t strlcat(char *, const char *, size_t) */
+ENTRY(strlcat)
+       push    {r4-r6, lr}
+       mov     r4, r0                  /* save dst */
+       mov     r5, r1                  /* save src */
+       mov     r6, r2                  /* save siz */
+        
+       mov     r1, r6                  /* get siz */
+       bl      PLT_SYM(strnlen)        /* find length of dst (up to siz) */
+
+       sub     r2, r6, r0              /* get remaining space in dst */
+       mov     r1, r5                  /* restore src */
+       mov     r5, r0                  /* save remaining space */
+       add     r0, r0, r4              /* set start to end of dst */
+       bl      PLT_SYM(strlcpy)        /* attempt to copy src */
+       add     r0, r0, r5              /* add remaining to strlcpy return */
+       pop     {r4-r6, lr}             /* restore registers */
+       RET                             /* return */
+END(strlcat)