Module Name: src
Committed By: matt
Date: Tue Aug 20 21:32:50 UTC 2013
Added Files:
src/common/lib/libc/arch/arm/string: strcpy_thumb.S
Log Message:
Thumb versions of strcpy/strlcpy/strncpy
To generate a diff of this commit:
cvs rdiff -u -r0 -r1.1 src/common/lib/libc/arch/arm/string/strcpy_thumb.S
Please note that diffs are not public domain; they are subject to the
copyright notices on the relevant files.
Added files:
Index: src/common/lib/libc/arch/arm/string/strcpy_thumb.S
diff -u /dev/null src/common/lib/libc/arch/arm/string/strcpy_thumb.S:1.1
--- /dev/null Tue Aug 20 21:32:50 2013
+++ src/common/lib/libc/arch/arm/string/strcpy_thumb.S Tue Aug 20 21:32:50 2013
@@ -0,0 +1,102 @@
+/*-
+ * 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: strcpy_thumb.S,v 1.1 2013/08/20 21:32:50 matt Exp $")
+
+#ifdef _LIBC
+#ifdef STRLCPY
+WEAK_ALIAS(strlcpy, _strlcpy)
+#endif
+#include "namespace.h"
+#endif
+
+/*
+ * These are "naive" versions of the str*cpy routines designed to be simple
+ * and small.
+ */
+
+#if defined(STRLCPY)
+/* LINTSTUB: size_t strlcpy(char *, const char *, size_t) */
+ENTRY(strlcpy)
+ adds r3, r1, #1 /* save src pointer (+ NUL) */
+ subs r2, r2, #1 /* make sure there's room for a NUL */
+ blt 3f /* no room, do the strlen */
+ adds r2, r2, r0 /* get end of dst */
+ subs r0, r0, r1 /* bias against r1 so one incr */
+1: cmp r0, r2 /* room for another char? */
+ beq 2f /* no, write NUL and do the strlen */
+ ldrb r3, [r1] /* read a byte */
+ strb r3, [r0, r1] /* write a byte */
+ adds r1, r1, #1 /* advance to next byte */
+ cmp r3, #0 /* was it a NUL? */
+ bne 1b /* no, do next byte */
+ b 4f /* yes, end of string, so return */
+2: movs r3, #0 /* NUL */
+ strb r3, [r0] /* write to end of string */
+3: ldrb r3, [r1] /* read a byte */
+ adds r1, r1, #1 /* advance to next byte */
+ cmp r3, #0 /* was it a NUL? */
+ bne 3b /* no, get next byte */
+4: subs r0, r1, r3 /* return length of src string */
+ RET
+END(strlcpy)
+#elif defined(STRNCPY)
+/* LINTSTUB: char * strncpy(char *, const char *, size_t) */
+ENTRY(strncpy)
+ mov ip, r0 /* we want to preserve r0 */
+ adds r2, r2, r0 /* get end of dst buffer */
+ subs r1, r1, r0 /* allows to only increment once */
+1: cmp r0, r2 /* are at the end of dst already? */
+ beq 3f /* yes, just return. */
+ ldrb r3, [r1, r0] /* read a byte */
+ strb r3, [r0] /* write a byte */
+ adds r0, r0, #1 /* advance a byte */
+ cmp r3, #0 /* was it a NUL? */
+ bne 1b /* no, try next byte */
+2: cmp r0, r2 /* are at the end of dst already? */
+ beq 3f /* yes, exit loop
+ strb r3, [r0] /* write a NUL */
+ adds r0, r0, #1 /* advance a bytes */
+ b 2b /* until dst is filled */
+3: mov r0, ip /* return dst pointer */
+ RET
+END(strncpy)
+#else
+/* LINTSTUB: char * strcpy(char *, const char *) */
+ENTRY(strcpy)
+ subs r2, r0, r1 /* we want to preserve r0 */
+1: ldrb r3, [r1] /* read a byte */
+ strb r3, [r2, r1] /* write a byte */
+ adds r1, r1, #1 /* advance to next byte */
+ cmp r3, #0 /* was it a NUL? */
+ bne 1b /* no, try next byte */
+ RET /* return dst pointer */
+END(strcpy)
+#endif
