[src/trunk]: src/common/lib/libc/arch/arm/string Add a native version of strc...

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

details:   https://anonhg.NetBSD.org/src/rev/c7a43c5f2744
branches:  trunk
changeset: 783978:c7a43c5f2744
user:      matt <matt%NetBSD.org@localhost>
date:      Mon Jan 14 00:07:29 2013 +0000

description:
Add a native version of strcat which uses the optimized strlen and strcpy
routines.

diffstat:

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

diffs (56 lines):

diff -r a3db372f1ae4 -r c7a43c5f2744 common/lib/libc/arch/arm/string/strcat_arm.S
--- /dev/null   Thu Jan 01 00:00:00 1970 +0000
+++ b/common/lib/libc/arch/arm/string/strcat_arm.S      Mon Jan 14 00:07:29 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>
+
+/*
+ * Implementation of strcat using strlen/strcpy.
+ */
+ENTRY(strcat)
+       str     lr, [sp, #-8]           /* save return address */
+       push    {r4, r5}                /* save registers */
+
+       mov     r4, r0                  /* save dst */
+       mov     r5, r1                  /* save append */
+
+       bl      PLT_SYM(strlen)         /* find length of dst */
+
+       add     r0, r0, r4              /* add to dst pointer */
+       mov     r1, r5                  /* fetch append */
+       bl      PLT_SYM(strcpy)         /* append string */
+
+       mov     r0, r4                  /* restore dst as return value */
+       pop     {r4, r5}                /* restore registers */
+       ldr     lr, [sp], #8            /* restore return address */
+       RET
+END(strcat)