[apple/libc.git] / i386 / string / bcopy_scalar.s

/*
 * Copyright (c) 2003-2006 Apple Computer, Inc. All rights reserved.
 *
 * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
 * 
 * This file contains Original Code and/or Modifications of Original Code
 * as defined in and that are subject to the Apple Public Source License
 * Version 2.0 (the 'License'). You may not use this file except in
 * compliance with the License. The rights granted to you under the License
 * may not be used to create, or enable the creation or redistribution of,
 * unlawful or unlicensed copies of an Apple operating system, or to
 * circumvent, violate, or enable the circumvention or violation of, any
 * terms of an Apple operating system software license agreement.
 * 
 * Please obtain a copy of the License at
 * http://www.opensource.apple.com/apsl/ and read it before using this file.
 * 
 * The Original Code and all software distributed under the License are
 * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
 * Please see the License for the specific language governing rights and
 * limitations under the License.
 * 
 * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
 */

/*-
 * Copyright (c) 1990 The Regents of the University of California.
 * All rights reserved.
 *
 * This code is derived from locore.s.
 *
 * 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 University of
 *      California, Berkeley and its contributors.
 * 4. Neither the name of the University 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 REGENTS 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 REGENTS 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/appleapiopts.h>
#include <machine/cpu_capabilities.h>
#include <platfunc.h>
#include <machine/asm.h>

	/*
	 * (ov)bcopy (src,dst,cnt)
	 *  ws@tools.de     (Wolfgang Solfrank, TooLs GmbH) +49-228-985800
	 */

PLATFUNC_FUNCTION_START_GENERIC(bcopy, scalar, 32, 5)
	pushl   %ebp        /* set up a frame for backtraces */
	movl    %esp,%ebp
	pushl   %esi
	pushl   %edi
	movl    8(%ebp),%esi
	movl    12(%ebp),%edi
	jmp 1f

PLATFUNC_FUNCTION_START_GENERIC(memcpy, scalar, 32, 0)
PLATFUNC_FUNCTION_START_GENERIC(memmove, scalar, 32, 0)
	pushl	%ebp		/* set up a frame for backtraces */
	movl	%esp,%ebp
	pushl   %esi
	pushl   %edi
	movl    8(%ebp),%edi
	movl    12(%ebp),%esi
	movl    %edi,%eax
1:
	movl    16(%ebp),%ecx
	movl    %edi,%edx
	subl    %esi,%edx
	cmpl    %ecx,%edx       /* overlapping? */
	jb      2f
	cld                     /* nope, copy forwards. */
	movl    %ecx,%edx
	shrl    $2,%ecx         /* copy by words */
	rep
	movsl
	movl    %edx,%ecx
	andl    $3,%ecx         /* any bytes left? */
	rep
	movsb
	popl    %edi
	popl    %esi
	popl	%ebp
	ret
2:
	addl    %ecx,%edi       /* copy backwards. */
	addl    %ecx,%esi
	std
	movl    %ecx,%edx
	andl    $3,%ecx         /* any fractional bytes? */
	decl    %edi
	decl    %esi
	rep
	movsb
	movl    %edx,%ecx       /* copy remainder by words */
	shrl    $2,%ecx
	subl    $3,%esi
	subl    $3,%edi
	rep
	movsl
	popl    %edi
	popl    %esi
	popl	%ebp
	cld
	ret

PLATFUNC_DESCRIPTOR(bcopy,scalar,0,0)
PLATFUNC_DESCRIPTOR(memcpy,scalar,0,0)
PLATFUNC_DESCRIPTOR(memmove,scalar,0,0)
Commit	Line	Data
1f2f436a A	1	/*
	2	* Copyright (c) 2003-2006 Apple Computer, Inc. All rights reserved.
	3	*
	4	* @APPLE_OSREFERENCE_LICENSE_HEADER_START@
	5	*
	6	* This file contains Original Code and/or Modifications of Original Code
	7	* as defined in and that are subject to the Apple Public Source License
	8	* Version 2.0 (the 'License'). You may not use this file except in
	9	* compliance with the License. The rights granted to you under the License
	10	* may not be used to create, or enable the creation or redistribution of,
	11	* unlawful or unlicensed copies of an Apple operating system, or to
	12	* circumvent, violate, or enable the circumvention or violation of, any
	13	* terms of an Apple operating system software license agreement.
	14	*
	15	* Please obtain a copy of the License at
	16	* http://www.opensource.apple.com/apsl/ and read it before using this file.
	17	*
	18	* The Original Code and all software distributed under the License are
	19	* distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
	20	* EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
	21	* INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
	22	* FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
	23	* Please see the License for the specific language governing rights and
	24	* limitations under the License.
	25	*
	26	* @APPLE_OSREFERENCE_LICENSE_HEADER_END@
	27	*/
	28
	29	/*-
	30	* Copyright (c) 1990 The Regents of the University of California.
	31	* All rights reserved.
	32	*
	33	* This code is derived from locore.s.
	34	*
	35	* Redistribution and use in source and binary forms, with or without
	36	* modification, are permitted provided that the following conditions
	37	* are met:
	38	* 1. Redistributions of source code must retain the above copyright
	39	* notice, this list of conditions and the following disclaimer.
	40	* 2. Redistributions in binary form must reproduce the above copyright
	41	* notice, this list of conditions and the following disclaimer in the
	42	* documentation and/or other materials provided with the distribution.
	43	* 3. All advertising materials mentioning features or use of this software
	44	* must display the following acknowledgement:
	45	* This product includes software developed by the University of
	46	* California, Berkeley and its contributors.
	47	* 4. Neither the name of the University nor the names of its contributors
	48	* may be used to endorse or promote products derived from this software
	49	* without specific prior written permission.
	50	*
	51	* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
	52	* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	53	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
	54	* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
	55	* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
	56	* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
	57	* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
	58	* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
	59	* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
	60	* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
	61	* SUCH DAMAGE.
	62	*/
	63
	64	#include <sys/appleapiopts.h>
65	#include <machine/cpu_capabilities.h>
66	#include <platfunc.h>
67	#include <machine/asm.h>
68
69	/*
70	* (ov)bcopy (src,dst,cnt)
71	* ws@tools.de (Wolfgang Solfrank, TooLs GmbH) +49-228-985800
72	*/
73
74	PLATFUNC_FUNCTION_START_GENERIC(bcopy, scalar, 32, 5)
75	pushl %ebp /* set up a frame for backtraces */
76	movl %esp,%ebp
77	pushl %esi
78	pushl %edi
79	movl 8(%ebp),%esi
80	movl 12(%ebp),%edi
81	jmp 1f
82
83	PLATFUNC_FUNCTION_START_GENERIC(memcpy, scalar, 32, 0)
84	PLATFUNC_FUNCTION_START_GENERIC(memmove, scalar, 32, 0)
85	pushl %ebp /* set up a frame for backtraces */
86	movl %esp,%ebp
87	pushl %esi
88	pushl %edi
89	movl 8(%ebp),%edi
90	movl 12(%ebp),%esi
91	movl %edi,%eax
92	1:
93	movl 16(%ebp),%ecx
94	movl %edi,%edx
95	subl %esi,%edx
96	cmpl %ecx,%edx /* overlapping? */
97	jb 2f
98	cld /* nope, copy forwards. */
99	movl %ecx,%edx
100	shrl $2,%ecx /* copy by words */
101	rep
102	movsl
103	movl %edx,%ecx
104	andl $3,%ecx /* any bytes left? */
105	rep
106	movsb
107	popl %edi
108	popl %esi
109	popl %ebp
110	ret
111	2:
112	addl %ecx,%edi /* copy backwards. */
113	addl %ecx,%esi
114	std
115	movl %ecx,%edx
116	andl $3,%ecx /* any fractional bytes? */
117	decl %edi
118	decl %esi
119	rep
120	movsb
121	movl %edx,%ecx /* copy remainder by words */
122	shrl $2,%ecx
123	subl $3,%esi
124	subl $3,%edi
125	rep
126	movsl
127	popl %edi
128	popl %esi
129	popl %ebp
130	cld
131	ret
132
133	PLATFUNC_DESCRIPTOR(bcopy,scalar,0,0)
134	PLATFUNC_DESCRIPTOR(memcpy,scalar,0,0)
135	PLATFUNC_DESCRIPTOR(memmove,scalar,0,0)