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Index: lib/libc/powerpc64/string/Makefile.inc
===================================================================
--- /dev/null
+++ lib/libc/powerpc64/string/Makefile.inc
@@ -0,0 +1,4 @@
+# $FreeBSD$
+
+MDSRCS+= \
+ strncpy.S
Index: lib/libc/powerpc64/string/strncpy.S
===================================================================
--- /dev/null
+++ lib/libc/powerpc64/string/strncpy.S
@@ -0,0 +1,125 @@
+/*-
+ * Copyright (c) 2018 Instituto de Pesquisas Eldorado
+ * 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. Neither the name of the author nor the names of its contributors may
+ * be used to endorse or promote products derived from this software
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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>
+__FBSDID("$FreeBSD$");
+
+ENTRY(strncpy)
+ stdu %r1,-40(%r1)
+ mflr %r0
+ std %r0,16(%r1)
+ std %r3,32(%r1)
+
+ xor %r6,%r6,%r6 /* fixed 0 reg */
+
+/* align loop */
+ addi %r3,%r3,-1
+.Lalign_loop:
+ /* len? */
+ cmpdi %r5,0
+ beq .Lexit
+ /* aligned? */
+ andi. %r0,%r4,7
+ beq .Ldw_copy
+ /* copy */
+ lbz %r7,0(%r4)
+ stbu %r7,1(%r3)
+ addi %r4,%r4,1
+ addi %r5,%r5,-1
+ /* zero? */
+ cmpdi %r7,0
+ beq .Lzero
+ b .Lalign_loop
+
+/* dword copy loop */
+.Ldw_copy:
+ /* prepare src and dst to use load/store and update */
+ addi %r3,%r3,-7
+ addi %r4,%r4,-8
+.Ldw_copy_loop:
+ cmpdi %r5,8
+ blt .Lbyte_copy
+
+ ldu %r0,8(%r4)
+ /* check for 0 */
+ cmpb %r7,%r0,%r6
+ cmpdi %r7,0
+ bne .Lbyte_copy_and_zero
+ /* copy to dst */
+ stdu %r0,8(%r3)
+ addi %r5,%r5,-8
+ b .Ldw_copy_loop
+
+/* Copy remaining src bytes, zero-out buffer
+ * Note: r5 will be >= 8
+ */
+.Lbyte_copy_and_zero:
+ addi %r3,%r3,7
+ addi %r4,%r4,-1
+.Lbyte_copy_and_zero_loop:
+ lbzu %r7,1(%r4)
+ stbu %r7,1(%r3)
+ addi %r5,%r5,-1
+ cmpdi %r7,0
+ beq .Lzero
+ b .Lbyte_copy_and_zero_loop
+
+/* zero-out remaining dst bytes */
+.Lzero:
+ addi %r3,%r3,1
+ li %r4,0
+ /* r5 has len already */
+ bl memset
+ nop
+ b .Lexit
+
+/* copy remaining (< 8) bytes, exit if 0 is found before */
+.Lbyte_copy:
+ cmpdi %r5,0
+ beq .Lexit
+ addi %r3,%r3,7
+ addi %r4,%r4,7
+ mtctr %r5
+.Lbyte_copy_loop:
+ lbzu %r7,1(%r4)
+ stbu %r7,1(%r3)
+ cmpdi %r7,0
+ beq .Lexit
+ bdnz .Lbyte_copy_loop
+
+.Lexit:
+ /* epilogue */
+ ld %r3,32(%r1)
+ ld %r0,16(%r1)
+ mtlr %r0
+ addi %r1,%r1,40
+ blr
+
+END(strncpy)
+
+ .section .note.GNU-stack,"",%progbits

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