Import unmodified NetBSD libc in trunk

This patch imports the unmodified current version of NetBSD libc.
The NetBSD includes are in /nbsd_include, while the libc code itself is 
split between lib/nbsd_libc and common/lib/libc.

lib/nbsd_libc/arch/powerpc64/string/bzero.S

@@ -0,0 +1,100 @@
+/*	$NetBSD: bzero.S,v 1.4 2008/04/28 20:22:57 martin Exp $	*/
+
+/*-
+ * Copyright (c) 2006 The NetBSD Foundation, Inc.
+ * All rights reserved.
+ *
+ * This code is derived from software contributed to The NetBSD Foundation
+ * by Ross Harvey.
+ *
+ * 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>
+
+	.file	"bzero.c"
+ENTRY(bzero)
+	mr	5, 4		# translate to memcpy signature
+	li	4, 0		# add missing memcpy param
+ENTRY(memset)
+	cmpldi	7, 5, 7		# only optimize if len >= 8
+	mr	9, 3
+	ble	7, 2f
+	rldicl.	0, 3, 0, 61	# only optimize if aligned
+	beq	0, 4f
+2:
+	cmpdi	7, 5, 0	
+	beqlr	7
+3:
+	mtctr	5
+	rldicl	0, 4, 0, 56
+	.p2align 4,, 15
+2:
+	stb	0, 0(9)		# byte-at-a-time loop
+	addi	9, 9, 1
+	bdnz	2b
+	blr			# done
+4:
+	rldicl	4, 4, 0, 56	# construct parallel store
+	cmpldi	7, 5, 31
+	mr	10, 3
+	sldi	0, 4, 8
+	or	0, 0, 4
+	sldi	9, 0, 16
+	or	0, 0, 9
+	sldi	11, 0, 32
+	or	0, 0, 11
+	ble	7, 5f
+	addi	9, 5, -32
+	srdi	9, 9, 5
+	addi	9, 9, 1
+	mtctr	9
+	.p2align 4,, 15
+2:
+	std	0, 0(10)	# 8-way + unrolled store loop
+	std	0, 8(10)
+	addi	5, 5, -32	# schedule count decrement
+	std	0, 16(10)
+	std	0, 24(10)
+	addi	10, 10, 32
+	bdnz	2b
+	cmpldi	7, 5, 7
+	ble	7, 8f
+5:
+	addi	9, 5, -8
+	srdi	9, 9, 3
+	addi	9, 9, 1
+	mtctr	9
+	.p2align 4,, 15
+14:
+	std	0, 0(10)	# 8-way not-unrolled loop
+	addi	5, 5, -8
+	addi	10, 10, 8
+	bdnz	14b
+8:
+	cmpdi	7, 5, 0
+	mr	9, 10
+	bne	7, 3b
+	blr
+	.long	0
+	.byte	0, 0, 0, 0, 0, 0, 0, 0
+	.size	.memset, .-.memset