svn commit: r224246 - head/lib/libc/amd64/string
George V. Neville-Neil
gnn at FreeBSD.org
Thu Jul 21 16:32:14 UTC 2011
Author: gnn
Date: Thu Jul 21 16:32:13 2011
New Revision: 224246
URL: http://svn.freebsd.org/changeset/base/224246
Log:
Make both stpcpy and strcpy be assembly language implementations
on amd64.
Submitted by: Guillaume Morin (guillaume at morinfr.org)
Reviewed by: kib, jhb
Approved by: re (bz)
MFC after: 1 month
Added:
head/lib/libc/amd64/string/stpcpy.S
- copied, changed from r223967, head/lib/libc/amd64/string/strcpy.S
head/lib/libc/amd64/string/strcpy.c (contents, props changed)
Deleted:
head/lib/libc/amd64/string/strcpy.S
Modified:
head/lib/libc/amd64/string/Makefile.inc
Modified: head/lib/libc/amd64/string/Makefile.inc
==============================================================================
--- head/lib/libc/amd64/string/Makefile.inc Thu Jul 21 14:25:12 2011 (r224245)
+++ head/lib/libc/amd64/string/Makefile.inc Thu Jul 21 16:32:13 2011 (r224246)
@@ -1,4 +1,4 @@
# $FreeBSD$
MDSRCS+= bcmp.S bcopy.S bzero.S memcmp.S memcpy.S memmove.S memset.S \
- strcat.S strcmp.S strcpy.S
+ strcat.S strcmp.S stpcpy.S strcpy.c
Copied and modified: head/lib/libc/amd64/string/stpcpy.S (from r223967, head/lib/libc/amd64/string/strcpy.S)
==============================================================================
--- head/lib/libc/amd64/string/strcpy.S Tue Jul 12 20:38:42 2011 (r223967, copy source)
+++ head/lib/libc/amd64/string/stpcpy.S Thu Jul 21 16:32:13 2011 (r224246)
@@ -1,17 +1,14 @@
/*
- * Written by J.T. Conklin <jtc at acorntoolworks.com>
+ * Adapted by Guillaume Morin <guillaume at hudson-trading.com> from strcpy.S
+ * written by J.T. Conklin <jtc at acorntoolworks.com>
* Public domain.
*/
#include <machine/asm.h>
__FBSDID("$FreeBSD$");
-#if 0
- RCSID("$NetBSD: strcpy.S,v 1.3 2004/07/19 20:04:41 drochner Exp $")
-#endif
-
/*
- * This strcpy implementation copies a byte at a time until the
+ * This stpcpy implementation copies a byte at a time until the
* source pointer is aligned to a word boundary, it then copies by
* words until it finds a word containing a zero byte, and finally
* copies by bytes until the end of the string is reached.
@@ -23,10 +20,11 @@ __FBSDID("$FreeBSD$");
* requirements.
*/
-ENTRY(strcpy)
- movq %rdi,%rax
- movabsq $0x0101010101010101,%r8
- movabsq $0x8080808080808080,%r9
+ .globl stpcpy,__stpcpy
+ENTRY(stpcpy)
+__stpcpy:
+ movabsq $0x0101010101010101,%r8
+ movabsq $0x8080808080808080,%r9
/*
* Align source to a word boundary.
@@ -41,6 +39,8 @@ ENTRY(strcpy)
incq %rdi
testb %dl,%dl
jne .Lalign
+ movq %rdi,%rax
+ dec %rax
ret
.p2align 4
@@ -61,54 +61,56 @@ ENTRY(strcpy)
*/
movb %dl,(%rdi)
- incq %rdi
testb %dl,%dl /* 1st byte == 0? */
je .Ldone
+ incq %rdi
shrq $8,%rdx
movb %dl,(%rdi)
- incq %rdi
testb %dl,%dl /* 2nd byte == 0? */
je .Ldone
+ incq %rdi
shrq $8,%rdx
movb %dl,(%rdi)
- incq %rdi
testb %dl,%dl /* 3rd byte == 0? */
je .Ldone
+ incq %rdi
shrq $8,%rdx
movb %dl,(%rdi)
- incq %rdi
testb %dl,%dl /* 4th byte == 0? */
je .Ldone
+ incq %rdi
shrq $8,%rdx
movb %dl,(%rdi)
- incq %rdi
testb %dl,%dl /* 5th byte == 0? */
je .Ldone
+ incq %rdi
shrq $8,%rdx
movb %dl,(%rdi)
- incq %rdi
testb %dl,%dl /* 6th byte == 0? */
je .Ldone
+ incq %rdi
shrq $8,%rdx
movb %dl,(%rdi)
- incq %rdi
testb %dl,%dl /* 7th byte == 0? */
je .Ldone
+ incq %rdi
shrq $8,%rdx
movb %dl,(%rdi)
incq %rdi
testb %dl,%dl /* 8th byte == 0? */
jne .Lword_aligned
+ decq %rdi
.Ldone:
+ movq %rdi,%rax
ret
-END(strcpy)
-
+END(stpcpy)
+
.section .note.GNU-stack,"",%progbits
Added: head/lib/libc/amd64/string/strcpy.c
==============================================================================
--- /dev/null 00:00:00 1970 (empty, because file is newly added)
+++ head/lib/libc/amd64/string/strcpy.c Thu Jul 21 16:32:13 2011 (r224246)
@@ -0,0 +1,38 @@
+/*
+ * Copyright 2011 George V. Neville-Neil. All rights reserved.
+ *
+ * The compilation of software known as FreeBSD is distributed under the
+ * following terms:
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+char *__stpcpy(char * __restrict, const char * __restrict);
+
+char *
+strcpy(char * __restrict to, const char * __restrict from)
+{
+ __stpcpy(to, from);
+ return(to);
+}
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