Add an initial set of arm optimized string functions. These

do seem to make noticable speed improvement...
 -Erik

11 files changed, 1116 insertions, 0 deletions

diff --git a/libc/string/arm/Makefile b/libc/string/arm/Makefile
new file mode 100644
index 000000000..25adea975
--- /dev/null
+++ b/libc/string/arm/Makefile
@@ -0,0 +1,39 @@
+# Makefile for uClibc
+#
+# Copyright (C) 2000-2003 Erik Andersen <andersen@uclibc.org>
+#
+# This program is free software; you can redistribute it and/or modify it under
+# the terms of the GNU Library General Public License as published by the Free
+# Software Foundation; either version 2 of the License, or (at your option) any
+# later version.
+#
+# This program is distributed in the hope that it will be useful, but WITHOUT
+# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+# FOR A PARTICULAR PURPOSE. See the GNU Library General Public License for more
+# details.
+#
+# You should have received a copy of the GNU Library General Public License
+# along with this program; if not, write to the Free Software Foundation, Inc.,
+# 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+
+TOPDIR=../../../
+include $(TOPDIR)Rules.mak
+
+SSRC= _memcpy.S bcopy.S bzero.S memcmp.S memcpy.S memmove.S memset.S \
+	strcmp.S strlen.S strncmp.S
+SOBJS=$(patsubst %.S,%.o, $(SSRC))
+
+all: $(SOBJS) $(LIBC)
+
+$(LIBC): ar-target
+
+ar-target: $(SOBJS)
+	$(AR) $(ARFLAGS) $(LIBC) $(SOBJS)
+
+$(SOBJS): %.o : %.S
+	$(CC) $(CFLAGS) -c $< -o $@
+	$(STRIPTOOL) -x -R .note -R .comment $*.o
+
+clean:
+	$(RM) *.[oa] *~ core
+
diff --git a/libc/string/arm/_memcpy.S b/libc/string/arm/_memcpy.S
new file mode 100644
index 000000000..5a5ba7c59
--- /dev/null
+++ b/libc/string/arm/_memcpy.S
@@ -0,0 +1,583 @@
+/*-
+ * Copyright (c) 1997 The NetBSD Foundation, Inc.
+ * All rights reserved.
+ *
+ * This code is derived from software contributed to The NetBSD Foundation
+ * by Neil A. Carson and Mark Brinicombe
+ *
+ * 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.
+ * 3. All advertising materials mentioning features or use of this software
+ *    must display the following acknowledgement:
+ *        This product includes software developed by the NetBSD
+ *        Foundation, Inc. and its contributors.
+ * 4. Neither the name of The NetBSD Foundation nor the names of its
+ *    contributors may be used to endorse or promote products derived
+ *    from this software without specific prior written permission.
+ *
+ * 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.
+ *
+ * Adapted for uClibc from NetBSD _memcpy.S,v 1.6 2003/10/09
+ * by Erik Andersen <andersen@codepoet.org>
+ */
+
+
+#include <endian.h>
+
+/*
+ * This is one fun bit of code ...
+ * Some easy listening music is suggested while trying to understand this
+ * code e.g. Iron Maiden
+ *
+ * For anyone attempting to understand it :
+ *
+ * The core code is implemented here with simple stubs for memcpy()
+ * memmove() and bcopy().
+ *
+ * All local labels are prefixed with Lmemcpy_
+ * Following the prefix a label starting f is used in the forward copy code
+ * while a label using b is used in the backwards copy code
+ * The source and destination addresses determine whether a forward or
+ * backward copy is performed.
+ * Separate bits of code are used to deal with the following situations
+ * for both the forward and backwards copy.
+ * unaligned source address
+ * unaligned destination address
+ * Separate copy routines are used to produce an optimised result for each
+ * of these cases.
+ * The copy code will use LDM/STM instructions to copy up to 32 bytes at
+ * a time where possible.
+ *
+ * Note: r12 (aka ip) can be trashed during the function along with
+ * r0-r3 although r0-r2 have defined uses i.e. src, dest, len through out.
+ * Additional registers are preserved prior to use i.e. r4, r5 & lr
+ *
+ * Apologies for the state of the comments ;-)
+ */
+
+		.text
+		.global _memcpy;
+		.type _memcpy,%function
+		.align 4;                                                               \
+
+_memcpy:
+	/* Determine copy direction */
+	cmp	r1, r0
+	bcc	.Lmemcpy_backwards
+
+	moveq	r0, #0			/* Quick abort for len=0 */
+	moveq	pc, lr
+
+	stmdb	sp!, {r0, lr}		/* memcpy() returns dest addr */
+	subs	r2, r2, #4
+	blt	.Lmemcpy_fl4		/* less than 4 bytes */
+	ands	r12, r0, #3
+	bne	.Lmemcpy_fdestul	/* oh unaligned destination addr */
+	ands	r12, r1, #3
+	bne	.Lmemcpy_fsrcul		/* oh unaligned source addr */
+
+.Lmemcpy_ft8:
+	/* We have aligned source and destination */
+	subs	r2, r2, #8
+	blt	.Lmemcpy_fl12		/* less than 12 bytes (4 from above) */
+	subs	r2, r2, #0x14         
+	blt	.Lmemcpy_fl32		/* less than 32 bytes (12 from above) */
+	stmdb	sp!, {r4}		/* borrow r4 */
+
+	/* blat 32 bytes at a time */
+	/* XXX for really big copies perhaps we should use more registers */
+.Lmemcpy_floop32:	
+	ldmia	r1!, {r3, r4, r12, lr}
+	stmia	r0!, {r3, r4, r12, lr}
+	ldmia	r1!, {r3, r4, r12, lr}
+	stmia	r0!, {r3, r4, r12, lr}
+	subs	r2, r2, #0x20         
+	bge	.Lmemcpy_floop32
+
+	cmn	r2, #0x10
+	ldmgeia	r1!, {r3, r4, r12, lr}	/* blat a remaining 16 bytes */
+	stmgeia	r0!, {r3, r4, r12, lr}
+	subge	r2, r2, #0x10         
+	ldmia	sp!, {r4}		/* return r4 */
+
+.Lmemcpy_fl32:
+	adds	r2, r2, #0x14         
+
+	/* blat 12 bytes at a time */
+.Lmemcpy_floop12:
+	ldmgeia	r1!, {r3, r12, lr}
+	stmgeia	r0!, {r3, r12, lr}
+	subges	r2, r2, #0x0c         
+	bge	.Lmemcpy_floop12
+
+.Lmemcpy_fl12:
+	adds	r2, r2, #8
+	blt	.Lmemcpy_fl4
+
+	subs	r2, r2, #4
+	ldrlt	r3, [r1], #4
+	strlt	r3, [r0], #4
+	ldmgeia	r1!, {r3, r12}
+	stmgeia	r0!, {r3, r12}
+	subge	r2, r2, #4
+
+.Lmemcpy_fl4:
+	/* less than 4 bytes to go */
+	adds	r2, r2, #4
+	ldmeqia	sp!, {r0, pc}		/* done */
+
+	/* copy the crud byte at a time */
+	cmp	r2, #2
+	ldrb	r3, [r1], #1
+	strb	r3, [r0], #1
+	ldrgeb	r3, [r1], #1
+	strgeb	r3, [r0], #1
+	ldrgtb	r3, [r1], #1
+	strgtb	r3, [r0], #1
+	ldmia	sp!, {r0, pc}
+
+	/* erg - unaligned destination */
+.Lmemcpy_fdestul:
+	rsb	r12, r12, #4
+	cmp	r12, #2
+
+	/* align destination with byte copies */
+	ldrb	r3, [r1], #1
+	strb	r3, [r0], #1
+	ldrgeb	r3, [r1], #1
+	strgeb	r3, [r0], #1
+	ldrgtb	r3, [r1], #1
+	strgtb	r3, [r0], #1
+	subs	r2, r2, r12
+	blt	.Lmemcpy_fl4		/* less the 4 bytes */
+
+	ands	r12, r1, #3
+	beq	.Lmemcpy_ft8		/* we have an aligned source */
+
+	/* erg - unaligned source */
+	/* This is where it gets nasty ... */
+.Lmemcpy_fsrcul:
+	bic	r1, r1, #3
+	ldr	lr, [r1], #4
+	cmp	r12, #2
+	bgt	.Lmemcpy_fsrcul3
+	beq	.Lmemcpy_fsrcul2
+	cmp	r2, #0x0c            
+	blt	.Lmemcpy_fsrcul1loop4
+	sub	r2, r2, #0x0c         
+	stmdb	sp!, {r4, r5}
+
+.Lmemcpy_fsrcul1loop16:
+#if BYTE_ORDER == BIG_ENDIAN
+	mov	r3, lr, lsl #8
+	ldmia	r1!, {r4, r5, r12, lr}
+	orr	r3, r3, r4, lsr #24
+	mov	r4, r4, lsl #8
+	orr	r4, r4, r5, lsr #24
+	mov	r5, r5, lsl #8
+	orr	r5, r5, r12, lsr #24
+	mov	r12, r12, lsl #8
+	orr	r12, r12, lr, lsr #24
+#else
+	mov	r3, lr, lsr #8
+	ldmia	r1!, {r4, r5, r12, lr}
+	orr	r3, r3, r4, lsl #24
+	mov	r4, r4, lsr #8
+	orr	r4, r4, r5, lsl #24
+	mov	r5, r5, lsr #8
+	orr	r5, r5, r12, lsl #24
+	mov	r12, r12, lsr #8
+	orr	r12, r12, lr, lsl #24
+#endif
+	stmia	r0!, {r3-r5, r12}
+	subs	r2, r2, #0x10         
+	bge	.Lmemcpy_fsrcul1loop16
+	ldmia	sp!, {r4, r5}
+	adds	r2, r2, #0x0c         
+	blt	.Lmemcpy_fsrcul1l4
+
+.Lmemcpy_fsrcul1loop4:
+#if BYTE_ORDER == BIG_ENDIAN
+	mov	r12, lr, lsl #8
+	ldr	lr, [r1], #4
+	orr	r12, r12, lr, lsr #24
+#else
+	mov	r12, lr, lsr #8
+	ldr	lr, [r1], #4
+	orr	r12, r12, lr, lsl #24
+#endif
+	str	r12, [r0], #4
+	subs	r2, r2, #4
+	bge	.Lmemcpy_fsrcul1loop4
+
+.Lmemcpy_fsrcul1l4:
+	sub	r1, r1, #3
+	b	.Lmemcpy_fl4
+
+.Lmemcpy_fsrcul2:
+	cmp	r2, #0x0c            
+	blt	.Lmemcpy_fsrcul2loop4
+	sub	r2, r2, #0x0c         
+	stmdb	sp!, {r4, r5}
+
+.Lmemcpy_fsrcul2loop16:
+#if BYTE_ORDER == BIG_ENDIAN
+	mov	r3, lr, lsl #16
+	ldmia	r1!, {r4, r5, r12, lr}
+	orr	r3, r3, r4, lsr #16
+	mov	r4, r4, lsl #16
+	orr	r4, r4, r5, lsr #16
+	mov	r5, r5, lsl #16
+	orr	r5, r5, r12, lsr #16
+	mov	r12, r12, lsl #16
+	orr	r12, r12, lr, lsr #16
+#else
+	mov	r3, lr, lsr #16
+	ldmia	r1!, {r4, r5, r12, lr}
+	orr	r3, r3, r4, lsl #16
+	mov	r4, r4, lsr #16
+	orr	r4, r4, r5, lsl #16
+	mov	r5, r5, lsr #16
+	orr	r5, r5, r12, lsl #16
+	mov	r12, r12, lsr #16
+	orr	r12, r12, lr, lsl #16
+#endif
+	stmia	r0!, {r3-r5, r12}
+	subs	r2, r2, #0x10         
+	bge	.Lmemcpy_fsrcul2loop16
+	ldmia	sp!, {r4, r5}
+	adds	r2, r2, #0x0c         
+	blt	.Lmemcpy_fsrcul2l4
+
+.Lmemcpy_fsrcul2loop4:
+#if BYTE_ORDER == BIG_ENDIAN
+	mov	r12, lr, lsl #16
+	ldr	lr, [r1], #4
+	orr	r12, r12, lr, lsr #16
+#else
+	mov	r12, lr, lsr #16
+	ldr	lr, [r1], #4
+	orr	r12, r12, lr, lsl #16
+#endif
+	str	r12, [r0], #4
+	subs	r2, r2, #4
+	bge	.Lmemcpy_fsrcul2loop4
+
+.Lmemcpy_fsrcul2l4:
+	sub	r1, r1, #2
+	b	.Lmemcpy_fl4
+
+.Lmemcpy_fsrcul3:
+	cmp	r2, #0x0c            
+	blt	.Lmemcpy_fsrcul3loop4
+	sub	r2, r2, #0x0c         
+	stmdb	sp!, {r4, r5}
+
+.Lmemcpy_fsrcul3loop16:
+#if BYTE_ORDER == BIG_ENDIAN
+	mov	r3, lr, lsl #24
+	ldmia	r1!, {r4, r5, r12, lr}
+	orr	r3, r3, r4, lsr #8
+	mov	r4, r4, lsl #24
+	orr	r4, r4, r5, lsr #8
+	mov	r5, r5, lsl #24
+	orr	r5, r5, r12, lsr #8
+	mov	r12, r12, lsl #24
+	orr	r12, r12, lr, lsr #8
+#else
+	mov	r3, lr, lsr #24
+	ldmia	r1!, {r4, r5, r12, lr}
+	orr	r3, r3, r4, lsl #8
+	mov	r4, r4, lsr #24
+	orr	r4, r4, r5, lsl #8
+	mov	r5, r5, lsr #24
+	orr	r5, r5, r12, lsl #8
+	mov	r12, r12, lsr #24
+	orr	r12, r12, lr, lsl #8
+#endif
+	stmia	r0!, {r3-r5, r12}
+	subs	r2, r2, #0x10         
+	bge	.Lmemcpy_fsrcul3loop16
+	ldmia	sp!, {r4, r5}
+	adds	r2, r2, #0x0c         
+	blt	.Lmemcpy_fsrcul3l4
+
+.Lmemcpy_fsrcul3loop4:
+#if BYTE_ORDER == BIG_ENDIAN
+	mov	r12, lr, lsl #24
+	ldr	lr, [r1], #4
+	orr	r12, r12, lr, lsr #8
+#else
+	mov	r12, lr, lsr #24
+	ldr	lr, [r1], #4
+	orr	r12, r12, lr, lsl #8
+#endif
+	str	r12, [r0], #4
+	subs	r2, r2, #4
+	bge	.Lmemcpy_fsrcul3loop4
+
+.Lmemcpy_fsrcul3l4:
+	sub	r1, r1, #1
+	b	.Lmemcpy_fl4
+
+.Lmemcpy_backwards:
+	add	r1, r1, r2
+	add	r0, r0, r2
+	subs	r2, r2, #4
+	blt	.Lmemcpy_bl4		/* less than 4 bytes */
+	ands	r12, r0, #3
+	bne	.Lmemcpy_bdestul	/* oh unaligned destination addr */
+	ands	r12, r1, #3
+	bne	.Lmemcpy_bsrcul		/* oh unaligned source addr */
+
+.Lmemcpy_bt8:
+	/* We have aligned source and destination */
+	subs	r2, r2, #8
+	blt	.Lmemcpy_bl12		/* less than 12 bytes (4 from above) */
+	stmdb	sp!, {r4, lr}
+	subs	r2, r2, #0x14		/* less than 32 bytes (12 from above) */
+	blt	.Lmemcpy_bl32
+
+	/* blat 32 bytes at a time */
+	/* XXX for really big copies perhaps we should use more registers */
+.Lmemcpy_bloop32:
+	ldmdb	r1!, {r3, r4, r12, lr}
+	stmdb	r0!, {r3, r4, r12, lr}
+	ldmdb	r1!, {r3, r4, r12, lr}
+	stmdb	r0!, {r3, r4, r12, lr}
+	subs	r2, r2, #0x20         
+	bge	.Lmemcpy_bloop32
+
+.Lmemcpy_bl32:
+	cmn	r2, #0x10            
+	ldmgedb	r1!, {r3, r4, r12, lr}	/* blat a remaining 16 bytes */
+	stmgedb	r0!, {r3, r4, r12, lr}
+	subge	r2, r2, #0x10         
+	adds	r2, r2, #0x14         
+	ldmgedb	r1!, {r3, r12, lr}	/* blat a remaining 12 bytes */
+	stmgedb	r0!, {r3, r12, lr}
+	subge	r2, r2, #0x0c         
+	ldmia	sp!, {r4, lr}
+
+.Lmemcpy_bl12:
+	adds	r2, r2, #8
+	blt	.Lmemcpy_bl4
+	subs	r2, r2, #4
+	ldrlt	r3, [r1, #-4]!
+	strlt	r3, [r0, #-4]!
+	ldmgedb	r1!, {r3, r12}
+	stmgedb	r0!, {r3, r12}
+	subge	r2, r2, #4
+
+.Lmemcpy_bl4:
+	/* less than 4 bytes to go */
+	adds	r2, r2, #4
+	moveq	pc, lr			/* done */
+
+	/* copy the crud byte at a time */
+	cmp	r2, #2
+	ldrb	r3, [r1, #-1]!
+	strb	r3, [r0, #-1]!
+	ldrgeb	r3, [r1, #-1]!
+	strgeb	r3, [r0, #-1]!
+	ldrgtb	r3, [r1, #-1]!
+	strgtb	r3, [r0, #-1]!
+	mov	pc, lr
+
+	/* erg - unaligned destination */
+.Lmemcpy_bdestul:
+	cmp	r12, #2
+
+	/* align destination with byte copies */
+	ldrb	r3, [r1, #-1]!
+	strb	r3, [r0, #-1]!
+	ldrgeb	r3, [r1, #-1]!
+	strgeb	r3, [r0, #-1]!
+	ldrgtb	r3, [r1, #-1]!
+	strgtb	r3, [r0, #-1]!
+	subs	r2, r2, r12
+	blt	.Lmemcpy_bl4		/* less than 4 bytes to go */
+	ands	r12, r1, #3
+	beq	.Lmemcpy_bt8		/* we have an aligned source */
+
+	/* erg - unaligned source */
+	/* This is where it gets nasty ... */
+.Lmemcpy_bsrcul:
+	bic	r1, r1, #3
+	ldr	r3, [r1, #0]
+	cmp	r12, #2
+	blt	.Lmemcpy_bsrcul1
+	beq	.Lmemcpy_bsrcul2
+	cmp	r2, #0x0c            
+	blt	.Lmemcpy_bsrcul3loop4
+	sub	r2, r2, #0x0c         
+	stmdb	sp!, {r4, r5, lr}
+
+.Lmemcpy_bsrcul3loop16:
+#if BYTE_ORDER == BIG_ENDIAN
+	mov	lr, r3, lsr #8
+	ldmdb	r1!, {r3-r5, r12}
+	orr	lr, lr, r12, lsl #24
+	mov	r12, r12, lsr #8
+	orr	r12, r12, r5, lsl #24
+	mov	r5, r5, lsr #8
+	orr	r5, r5, r4, lsl #24
+	mov	r4, r4, lsr #8
+	orr	r4, r4, r3, lsl #24
+#else
+	mov	lr, r3, lsl #8
+	ldmdb	r1!, {r3-r5, r12}
+	orr	lr, lr, r12, lsr #24
+	mov	r12, r12, lsl #8
+	orr	r12, r12, r5, lsr #24
+	mov	r5, r5, lsl #8
+	orr	r5, r5, r4, lsr #24
+	mov	r4, r4, lsl #8
+	orr	r4, r4, r3, lsr #24
+#endif
+	stmdb	r0!, {r4, r5, r12, lr}
+	subs	r2, r2, #0x10         
+	bge	.Lmemcpy_bsrcul3loop16
+	ldmia	sp!, {r4, r5, lr}
+	adds	r2, r2, #0x0c         
+	blt	.Lmemcpy_bsrcul3l4
+
+.Lmemcpy_bsrcul3loop4:
+#if BYTE_ORDER == BIG_ENDIAN
+	mov	r12, r3, lsr #8
+	ldr	r3, [r1, #-4]!
+	orr	r12, r12, r3, lsl #24
+#else
+	mov	r12, r3, lsl #8
+	ldr	r3, [r1, #-4]!
+	orr	r12, r12, r3, lsr #24
+#endif
+	str	r12, [r0, #-4]!
+	subs	r2, r2, #4
+	bge	.Lmemcpy_bsrcul3loop4
+
+.Lmemcpy_bsrcul3l4:
+	add	r1, r1, #3
+	b	.Lmemcpy_bl4
+
+.Lmemcpy_bsrcul2:
+	cmp	r2, #0x0c            
+	blt	.Lmemcpy_bsrcul2loop4
+	sub	r2, r2, #0x0c         
+	stmdb	sp!, {r4, r5, lr}
+
+.Lmemcpy_bsrcul2loop16:
+#if BYTE_ORDER == BIG_ENDIAN
+	mov	lr, r3, lsr #16
+	ldmdb	r1!, {r3-r5, r12}
+	orr	lr, lr, r12, lsl #16
+	mov	r12, r12, lsr #16
+	orr	r12, r12, r5, lsl #16
+	mov	r5, r5, lsr #16
+	orr	r5, r5, r4, lsl #16
+	mov	r4, r4, lsr #16
+	orr	r4, r4, r3, lsl #16
+#else
+	mov	lr, r3, lsl #16
+	ldmdb	r1!, {r3-r5, r12}
+	orr	lr, lr, r12, lsr #16
+	mov	r12, r12, lsl #16
+	orr	r12, r12, r5, lsr #16
+	mov	r5, r5, lsl #16
+	orr	r5, r5, r4, lsr #16
+	mov	r4, r4, lsl #16
+	orr	r4, r4, r3, lsr #16
+#endif
+	stmdb	r0!, {r4, r5, r12, lr}
+	subs	r2, r2, #0x10         
+	bge	.Lmemcpy_bsrcul2loop16
+	ldmia	sp!, {r4, r5, lr}
+	adds	r2, r2, #0x0c         
+	blt	.Lmemcpy_bsrcul2l4
+
+.Lmemcpy_bsrcul2loop4:
+#if BYTE_ORDER == BIG_ENDIAN
+	mov	r12, r3, lsr #16
+	ldr	r3, [r1, #-4]!
+	orr	r12, r12, r3, lsl #16
+#else
+	mov	r12, r3, lsl #16
+	ldr	r3, [r1, #-4]!
+	orr	r12, r12, r3, lsr #16
+#endif
+	str	r12, [r0, #-4]!
+	subs	r2, r2, #4
+	bge	.Lmemcpy_bsrcul2loop4
+
+.Lmemcpy_bsrcul2l4:
+	add	r1, r1, #2
+	b	.Lmemcpy_bl4
+
+.Lmemcpy_bsrcul1:
+	cmp	r2, #0x0c            
+	blt	.Lmemcpy_bsrcul1loop4
+	sub	r2, r2, #0x0c         
+	stmdb	sp!, {r4, r5, lr}
+
+.Lmemcpy_bsrcul1loop32:
+#if BYTE_ORDER == BIG_ENDIAN
+	mov	lr, r3, lsr #24
+	ldmdb	r1!, {r3-r5, r12}
+	orr	lr, lr, r12, lsl #8
+	mov	r12, r12, lsr #24
+	orr	r12, r12, r5, lsl #8
+	mov	r5, r5, lsr #24
+	orr	r5, r5, r4, lsl #8
+	mov	r4, r4, lsr #24
+	orr	r4, r4, r3, lsl #8
+#else
+	mov	lr, r3, lsl #24
+	ldmdb	r1!, {r3-r5, r12}
+	orr	lr, lr, r12, lsr #8
+	mov	r12, r12, lsl #24
+	orr	r12, r12, r5, lsr #8
+	mov	r5, r5, lsl #24
+	orr	r5, r5, r4, lsr #8
+	mov	r4, r4, lsl #24
+	orr	r4, r4, r3, lsr #8
+#endif
+	stmdb	r0!, {r4, r5, r12, lr}
+	subs	r2, r2, #0x10         
+	bge	.Lmemcpy_bsrcul1loop32
+	ldmia	sp!, {r4, r5, lr}
+	adds	r2, r2, #0x0c         
+	blt	.Lmemcpy_bsrcul1l4
+
+.Lmemcpy_bsrcul1loop4:
+#if BYTE_ORDER == BIG_ENDIAN
+	mov	r12, r3, lsr #24
+	ldr	r3, [r1, #-4]!
+	orr	r12, r12, r3, lsl #8
+#else
+	mov	r12, r3, lsl #24
+	ldr	r3, [r1, #-4]!
+	orr	r12, r12, r3, lsr #8
+#endif
+	str	r12, [r0, #-4]!
+	subs	r2, r2, #4
+	bge	.Lmemcpy_bsrcul1loop4
+
+.Lmemcpy_bsrcul1l4:
+	add	r1, r1, #1
+	b	.Lmemcpy_bl4
diff --git a/libc/string/arm/bcopy.S b/libc/string/arm/bcopy.S
new file mode 100644
index 000000000..c256df3f3
--- /dev/null
+++ b/libc/string/arm/bcopy.S
@@ -0,0 +1,52 @@
+/*-
+ * Copyright (c) 1997 The NetBSD Foundation, Inc.
+ * All rights reserved.
+ *
+ * This code is derived from software contributed to The NetBSD Foundation
+ * by Neil A. Carson and Mark Brinicombe
+ *
+ * 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.
+ * 3. All advertising materials mentioning features or use of this software
+ *    must display the following acknowledgement:
+ *	This product includes software developed by the NetBSD
+ *	Foundation, Inc. and its contributors.
+ * 4. Neither the name of The NetBSD Foundation nor the names of its
+ *    contributors may be used to endorse or promote products derived
+ *    from this software without specific prior written permission.
+ *
+ * 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.
+ *
+ * Adapted for uClibc from NetBSD bcopy.S,v 1.2 1997/10/09
+ * by Erik Andersen <andersen@codepoet.org>
+ */
+
+/* bcopy = memcpy/memmove with arguments reversed. */
+
+		.text
+		.global bcopy;
+		.type bcopy,%function
+		.align 4;                                                               \
+
+bcopy:
+	/* switch the source and destination registers */
+	eor     r0, r1, r0 
+	eor     r1, r0, r1 
+	eor     r0, r1, r0 
+	b	_memcpy (PLT)
diff --git a/libc/string/arm/bzero.S b/libc/string/arm/bzero.S
new file mode 100644
index 000000000..52245a244
--- /dev/null
+++ b/libc/string/arm/bzero.S
@@ -0,0 +1,48 @@
+/*-
+ * Copyright (c) 1997 The NetBSD Foundation, Inc.
+ * All rights reserved.
+ *
+ * This code is derived from software contributed to The NetBSD Foundation
+ * by Neil A. Carson and Mark Brinicombe
+ *
+ * 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.
+ * 3. All advertising materials mentioning features or use of this software
+ *    must display the following acknowledgement:
+ *	This product includes software developed by the NetBSD
+ *	Foundation, Inc. and its contributors.
+ * 4. Neither the name of The NetBSD Foundation nor the names of its
+ *    contributors may be used to endorse or promote products derived
+ *    from this software without specific prior written permission.
+ *
+ * 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.
+ *
+ * Adapted for uClibc from NetBSD bzero.S,v 1.2 1997/10/09
+ * by Erik Andersen <andersen@codepoet.org>
+ */
+
+		.text
+		.global bzero;
+		.type bzero,%function
+		.align 4;                                                               \
+
+bzero:
+	mov	r2, r1
+	mov	r1, #0
+	b	memset (PLT)
diff --git a/libc/string/arm/memcmp.S b/libc/string/arm/memcmp.S
new file mode 100644
index 000000000..8f3f137b0
--- /dev/null
+++ b/libc/string/arm/memcmp.S
@@ -0,0 +1,53 @@
+/*
+ * Copyright (c) 2002 ARM Ltd
+ * 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. 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.
+ * 3. The name of the company may not be used to endorse or promote
+ *    products derived from this software without specific prior written
+ *    permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY ARM LTD ``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 ARM LTD 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.
+ *
+ * Adapted for uClibc from NetBSD memcmp.S, version 1.2 2003/04/05
+ * by Erik Andersen <andersen@codepoet.org>
+ */
+
+
+		.text
+		.global memcmp;
+		.type memcmp,%function
+		.align 4;                                                               \
+
+memcmp:
+	/* if ((len - 1) < 0) return 0 */
+	subs	r2, r2, #1
+	movmi	r0, #0
+	movmi	pc, lr
+
+	/* ip == last src address to compare */
+	add	ip, r0, r2
+1:
+	ldrb	r2, [r0], #1
+	ldrb	r3, [r1], #1
+	cmp	ip, r0
+	cmpcs	r2, r3
+	beq	1b
+	sub	r0, r2, r3
+	mov	pc, lr
diff --git a/libc/string/arm/memcpy.S b/libc/string/arm/memcpy.S
new file mode 100644
index 000000000..cc9a43cb4
--- /dev/null
+++ b/libc/string/arm/memcpy.S
@@ -0,0 +1,48 @@
+/*-
+ * Copyright (c) 1997 The NetBSD Foundation, Inc.
+ * All rights reserved.
+ *
+ * This code is derived from software contributed to The NetBSD Foundation
+ * by Neil A. Carson and Mark Brinicombe
+ *
+ * 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.
+ * 3. All advertising materials mentioning features or use of this software
+ *    must display the following acknowledgement:
+ *	This product includes software developed by the NetBSD
+ *	Foundation, Inc. and its contributors.
+ * 4. Neither the name of The NetBSD Foundation nor the names of its
+ *    contributors may be used to endorse or promote products derived
+ *    from this software without specific prior written permission.
+ *
+ * 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.
+ *
+ * Adapted for uClibc from NetBSD memcpy.S,v 1.3 2003/04/05
+ * by Erik Andersen <andersen@codepoet.org>
+ */
+
+		.text
+		.global memcpy;
+		.type memcpy,%function
+		.align 4;                                                               \
+
+memcpy:
+	stmfd	sp!, {r0, lr}
+	bl	_memcpy (PLT)
+	ldmfd	sp!, {r0, pc}
diff --git a/libc/string/arm/memmove.S b/libc/string/arm/memmove.S
new file mode 100644
index 000000000..84e3e518c
--- /dev/null
+++ b/libc/string/arm/memmove.S
@@ -0,0 +1,48 @@
+/*-
+ * Copyright (c) 1997 The NetBSD Foundation, Inc.
+ * All rights reserved.
+ *
+ * This code is derived from software contributed to The NetBSD Foundation
+ * by Neil A. Carson and Mark Brinicombe
+ *
+ * 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.
+ * 3. All advertising materials mentioning features or use of this software
+ *    must display the following acknowledgement:
+ *	This product includes software developed by the NetBSD
+ *	Foundation, Inc. and its contributors.
+ * 4. Neither the name of The NetBSD Foundation nor the names of its
+ *    contributors may be used to endorse or promote products derived
+ *    from this software without specific prior written permission.
+ *
+ * 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.
+ *
+ * Adapted for uClibc from NetBSD memmove.S,v 1.3 2003/04/05
+ * by Erik Andersen <andersen@codepoet.org>
+ */
+
+		.text
+		.global memmove;
+		.type memmove,%function
+		.align 4;                                                               \
+
+memmove:
+	stmfd	sp!, {r0, lr}
+	bl	_memcpy (PLT)
+	ldmfd	sp!, {r0, pc}
diff --git a/libc/string/arm/memset.S b/libc/string/arm/memset.S
new file mode 100644
index 000000000..07d3913f9
--- /dev/null
+++ b/libc/string/arm/memset.S
@@ -0,0 +1,72 @@
+/* Copyright (C) 1998 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+   Contributed by Philip Blundell <philb@gnu.org>
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, write to the Free
+   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
+   02111-1307 USA.  */
+
+#include <sys/syscall.h>
+
+		.text
+		.global memset;
+		.type memset,%function
+		.align 4;                                                               \
+
+memset:
+	mov	a4, a1
+	cmp	a3, $8		@ at least 8 bytes to do?
+	blt	2f
+	orr	a2, a2, a2, lsl $8
+	orr	a2, a2, a2, lsl $16
+1:
+	tst	a4, $3		@ aligned yet?
+	strneb	a2, [a4], $1
+	subne	a3, a3, $1
+	bne	1b
+	mov	ip, a2
+1:
+	cmp	a3, $8		@ 8 bytes still to do?
+	blt	2f
+	stmia	a4!, {a2, ip}
+	sub	a3, a3, $8
+	cmp	a3, $8		@ 8 bytes still to do?
+	blt	2f
+	stmia	a4!, {a2, ip}
+	sub	a3, a3, $8
+	cmp	a3, $8		@ 8 bytes still to do?
+	blt	2f
+	stmia	a4!, {a2, ip}
+	sub	a3, a3, $8
+	cmp	a3, $8		@ 8 bytes still to do?
+	stmgeia	a4!, {a2, ip}
+	subge	a3, a3, $8
+	bge	1b
+2:
+	movs	a3, a3		@ anything left?
+	moveq	pc, lr		@ nope
+	rsb	a3, a3, $7
+	add	pc, pc, a3, lsl $2
+	mov	r0, r0
+	strb	a2, [a4], $1
+	strb	a2, [a4], $1
+	strb	a2, [a4], $1
+	strb	a2, [a4], $1
+	strb	a2, [a4], $1
+	strb	a2, [a4], $1
+	strb	a2, [a4], $1
+	mov	pc, lr
+
+.size memset,.-memset;
+
diff --git a/libc/string/arm/strcmp.S b/libc/string/arm/strcmp.S
new file mode 100644
index 000000000..b2f26d63a
--- /dev/null
+++ b/libc/string/arm/strcmp.S
@@ -0,0 +1,49 @@
+/*
+ * Copyright (c) 2002 ARM Ltd
+ * 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. 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.
+ * 3. The name of the company may not be used to endorse or promote
+ *    products derived from this software without specific prior written
+ *    permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY ARM LTD ``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 ARM LTD 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.
+ *
+ * Adapted for uClibc from NetBSD strcmp.S, version 1.3 2003/04/05
+ * by Erik Andersen <andersen@codepoet.org>
+ */
+
+		.text
+		.global strcmp;
+		.type strcmp,%function
+		.align 4;                                                               \
+
+strcmp:
+1:
+	ldrb	r2, [r0], #1
+	ldrb	r3, [r1], #1
+	cmp	r2, #1
+	cmpcs	r2, r3
+	beq	1b
+	sub	r0, r2, r3
+	mov	pc, lr
+
+.weak  strcoll;
+    strcoll = strcmp
+
diff --git a/libc/string/arm/strlen.S b/libc/string/arm/strlen.S
new file mode 100644
index 000000000..a84114c31
--- /dev/null
+++ b/libc/string/arm/strlen.S
@@ -0,0 +1,71 @@
+/* Copyright (C) 1998 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+   Code contributed by Matthew Wilcox <willy@odie.barnet.ac.uk>
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, write to the Free
+   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
+   02111-1307 USA.  */
+
+#include <endian.h>
+#include <sys/syscall.h>
+
+/* size_t strlen(const char *S)
+ * entry: r0 -> string
+ * exit: r0 = len
+ */
+
+		.text
+		.global strlen;
+		.type strlen,%function
+		.align 4;                                                               \
+
+strlen:
+	bic     r1, r0, $3              @ addr of word containing first byte
+	ldr     r2, [r1], $4            @ get the first word
+	ands    r3, r0, $3              @ how many bytes are duff?
+	rsb     r0, r3, $0              @ get - that number into counter.
+	beq     Laligned                @ skip into main check routine if no
+					@ more
+#if __BYTE_ORDER == __BIG_ENDIAN
+	orr     r2, r2, $0xff000000     @ set this byte to non-zero
+	subs    r3, r3, $1              @ any more to do?
+	orrgt   r2, r2, $0x00ff0000     @ if so, set this byte
+	subs    r3, r3, $1              @ more?
+	orrgt   r2, r2, $0x0000ff00     @ then set.
+#else
+	orr     r2, r2, $0x000000ff     @ set this byte to non-zero
+	subs    r3, r3, $1              @ any more to do?
+	orrgt   r2, r2, $0x0000ff00     @ if so, set this byte
+	subs    r3, r3, $1              @ more?
+	orrgt   r2, r2, $0x00ff0000     @ then set.
+#endif
+Laligned:				@ here, we have a word in r2.  Does it
+	tst     r2, $0x000000ff         @ contain any zeroes?
+	tstne   r2, $0x0000ff00         @
+	tstne   r2, $0x00ff0000         @
+	tstne   r2, $0xff000000         @
+	addne   r0, r0, $4              @ if not, the string is 4 bytes longer
+	ldrne   r2, [r1], $4            @ and we continue to the next word
+	bne     Laligned                @
+Llastword:				@ drop through to here once we find a
+	tst     r2, $0x000000ff         @ word that has a zero byte in it
+	addne   r0, r0, $1              @
+	tstne   r2, $0x0000ff00         @ and add up to 3 bytes on to it
+	addne   r0, r0, $1              @
+	tstne   r2, $0x00ff0000         @ (if first three all non-zero, 4th
+	addne   r0, r0, $1              @  must be zero)
+	mov	pc,lr
+
+.size strlen,.-strlen;
+
diff --git a/libc/string/arm/strncmp.S b/libc/string/arm/strncmp.S
new file mode 100644
index 000000000..6f478b5ed
--- /dev/null
+++ b/libc/string/arm/strncmp.S
@@ -0,0 +1,53 @@
+/*
+ * Copyright (c) 2002 ARM Ltd
+ * 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. 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.
+ * 3. The name of the company may not be used to endorse or promote
+ *    products derived from this software without specific prior written
+ *    permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY ARM LTD ``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 ARM LTD 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.
+ *
+ * Adapted for uClibc from NetBSD strncmp.S, version 1.2 2003/04/05
+ * by Erik Andersen <andersen@codepoet.org>
+ */
+
+		.text
+		.global strncmp;
+		.type strncmp,%function
+		.align 4;                                                               \
+
+strncmp:
+	/* if ((len - 1) < 0) return 0 */
+	subs	r2, r2, #1
+	movmi	r0, #0
+	movmi	pc, lr
+
+	/* ip == last src address to compare */
+	add	ip, r0, r2
+1:
+	ldrb	r2, [r0], #1
+	ldrb	r3, [r1], #1
+	cmp	ip, r0
+	cmpcs	r2, #1
+	cmpcs	r2, r3
+	beq	1b
+	sub	r0, r2, r3
+	mov	pc, lr