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freebsd-dev/lib/libc/i386/string/bcopy.S

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First crack at making libc work with the new make macros. It compiles on my machine, and a simple static (genassym) and shared (sysctl) executable both work. Still to be done: RPCand YP merge.
1994-08-05 01:19:12 +00:00
/*-
* Copyright (c) 1990 The Regents of the University of California.
* All rights reserved.
*
Merged with the 1996/11/12 NetBSD version: - use a slightly less bogus copyright. This file was never contributed to Berkeley. It still claims to be copright by the Regents. - use <machine/asm.h> instead of "DEFS.h". - use RCSID($Id$) instead of explicit assembly code and messy ifdefs. The rcsid won't be put into the object file until we make RCSID() non-null. NetBSD uses a LIBC_SCCS ifdef here. We used a LIBC_RCS instead, but I want RCSID() to be controlled directly by LIBC_RCS (actually by LIB_RCS). This is the only difference with the NetBSD version. - added ifdefs to support generation of memcpy() and memmove(). The other changes are "while I'm here" to get this. - improved style of the copy backwards case.
1997-04-20 12:09:18 +00:00
* This code is derived from locore.s.
First crack at making libc work with the new make macros. It compiles on my machine, and a simple static (genassym) and shared (sysctl) executable both work. Still to be done: RPCand YP merge.
1994-08-05 01:19:12 +00:00
*
* 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.
*/
Merged with the 1996/11/12 NetBSD version: - use a slightly less bogus copyright. This file was never contributed to Berkeley. It still claims to be copright by the Regents. - use <machine/asm.h> instead of "DEFS.h". - use RCSID($Id$) instead of explicit assembly code and messy ifdefs. The rcsid won't be put into the object file until we make RCSID() non-null. NetBSD uses a LIBC_SCCS ifdef here. We used a LIBC_RCS instead, but I want RCSID() to be controlled directly by LIBC_RCS (actually by LIB_RCS). This is the only difference with the NetBSD version. - added ifdefs to support generation of memcpy() and memmove(). The other changes are "while I'm here" to get this. - improved style of the copy backwards case.
1997-04-20 12:09:18 +00:00
#include <machine/asm.h>
Standardize on our SCM ID style.
2002-03-23 02:44:19 +00:00
__FBSDID("$FreeBSD$");
First crack at making libc work with the new make macros. It compiles on my machine, and a simple static (genassym) and shared (sysctl) executable both work. Still to be done: RPCand YP merge.
1994-08-05 01:19:12 +00:00
Standardize on our SCM ID style.
2002-03-23 02:44:19 +00:00
#if 0
Merged with the 1996/11/12 NetBSD version: - use a slightly less bogus copyright. This file was never contributed to Berkeley. It still claims to be copright by the Regents. - use <machine/asm.h> instead of "DEFS.h". - use RCSID($Id$) instead of explicit assembly code and messy ifdefs. The rcsid won't be put into the object file until we make RCSID() non-null. NetBSD uses a LIBC_SCCS ifdef here. We used a LIBC_RCS instead, but I want RCSID() to be controlled directly by LIBC_RCS (actually by LIB_RCS). This is the only difference with the NetBSD version. - added ifdefs to support generation of memcpy() and memmove(). The other changes are "while I'm here" to get this. - improved style of the copy backwards case.
1997-04-20 12:09:18 +00:00
RCSID("$NetBSD: bcopy.S,v 1.6 1996/11/12 00:50:06 jtc Exp $")
Standardize on our SCM ID style.
2002-03-23 02:44:19 +00:00
#endif
First crack at making libc work with the new make macros. It compiles on my machine, and a simple static (genassym) and shared (sysctl) executable both work. Still to be done: RPCand YP merge.
1994-08-05 01:19:12 +00:00
/*
* (ov)bcopy (src,dst,cnt)
* ws@tools.de (Wolfgang Solfrank, TooLs GmbH) +49-228-985800
*/
Merged with the 1996/11/12 NetBSD version: - use a slightly less bogus copyright. This file was never contributed to Berkeley. It still claims to be copright by the Regents. - use <machine/asm.h> instead of "DEFS.h". - use RCSID($Id$) instead of explicit assembly code and messy ifdefs. The rcsid won't be put into the object file until we make RCSID() non-null. NetBSD uses a LIBC_SCCS ifdef here. We used a LIBC_RCS instead, but I want RCSID() to be controlled directly by LIBC_RCS (actually by LIB_RCS). This is the only difference with the NetBSD version. - added ifdefs to support generation of memcpy() and memmove(). The other changes are "while I'm here" to get this. - improved style of the copy backwards case.
1997-04-20 12:09:18 +00:00
#ifdef MEMCOPY
ENTRY(memcpy)
#else
#ifdef MEMMOVE
ENTRY(memmove)
#else
First crack at making libc work with the new make macros. It compiles on my machine, and a simple static (genassym) and shared (sysctl) executable both work. Still to be done: RPCand YP merge.
1994-08-05 01:19:12 +00:00
ENTRY(bcopy)
Merged with the 1996/11/12 NetBSD version: - use a slightly less bogus copyright. This file was never contributed to Berkeley. It still claims to be copright by the Regents. - use <machine/asm.h> instead of "DEFS.h". - use RCSID($Id$) instead of explicit assembly code and messy ifdefs. The rcsid won't be put into the object file until we make RCSID() non-null. NetBSD uses a LIBC_SCCS ifdef here. We used a LIBC_RCS instead, but I want RCSID() to be controlled directly by LIBC_RCS (actually by LIB_RCS). This is the only difference with the NetBSD version. - added ifdefs to support generation of memcpy() and memmove(). The other changes are "while I'm here" to get this. - improved style of the copy backwards case.
1997-04-20 12:09:18 +00:00
#endif
#endif
First crack at making libc work with the new make macros. It compiles on my machine, and a simple static (genassym) and shared (sysctl) executable both work. Still to be done: RPCand YP merge.
1994-08-05 01:19:12 +00:00
pushl %esi
pushl %edi
Merged with the 1996/11/12 NetBSD version: - use a slightly less bogus copyright. This file was never contributed to Berkeley. It still claims to be copright by the Regents. - use <machine/asm.h> instead of "DEFS.h". - use RCSID($Id$) instead of explicit assembly code and messy ifdefs. The rcsid won't be put into the object file until we make RCSID() non-null. NetBSD uses a LIBC_SCCS ifdef here. We used a LIBC_RCS instead, but I want RCSID() to be controlled directly by LIBC_RCS (actually by LIB_RCS). This is the only difference with the NetBSD version. - added ifdefs to support generation of memcpy() and memmove(). The other changes are "while I'm here" to get this. - improved style of the copy backwards case.
1997-04-20 12:09:18 +00:00
#if defined(MEMCOPY) || defined(MEMMOVE)
movl 12(%esp),%edi
movl 16(%esp),%esi
Eliminate superfluous memory access in memcpy(3)/memmove(3). Obtained from: NetBSD MFC after: 1 week
2002-10-15 09:50:07 +00:00
movl %edi,%eax
Merged with the 1996/11/12 NetBSD version: - use a slightly less bogus copyright. This file was never contributed to Berkeley. It still claims to be copright by the Regents. - use <machine/asm.h> instead of "DEFS.h". - use RCSID($Id$) instead of explicit assembly code and messy ifdefs. The rcsid won't be put into the object file until we make RCSID() non-null. NetBSD uses a LIBC_SCCS ifdef here. We used a LIBC_RCS instead, but I want RCSID() to be controlled directly by LIBC_RCS (actually by LIB_RCS). This is the only difference with the NetBSD version. - added ifdefs to support generation of memcpy() and memmove(). The other changes are "while I'm here" to get this. - improved style of the copy backwards case.
1997-04-20 12:09:18 +00:00
#else
First crack at making libc work with the new make macros. It compiles on my machine, and a simple static (genassym) and shared (sysctl) executable both work. Still to be done: RPCand YP merge.
1994-08-05 01:19:12 +00:00
movl 12(%esp),%esi
movl 16(%esp),%edi
Merged with the 1996/11/12 NetBSD version: - use a slightly less bogus copyright. This file was never contributed to Berkeley. It still claims to be copright by the Regents. - use <machine/asm.h> instead of "DEFS.h". - use RCSID($Id$) instead of explicit assembly code and messy ifdefs. The rcsid won't be put into the object file until we make RCSID() non-null. NetBSD uses a LIBC_SCCS ifdef here. We used a LIBC_RCS instead, but I want RCSID() to be controlled directly by LIBC_RCS (actually by LIB_RCS). This is the only difference with the NetBSD version. - added ifdefs to support generation of memcpy() and memmove(). The other changes are "while I'm here" to get this. - improved style of the copy backwards case.
1997-04-20 12:09:18 +00:00
#endif
First crack at making libc work with the new make macros. It compiles on my machine, and a simple static (genassym) and shared (sysctl) executable both work. Still to be done: RPCand YP merge.
1994-08-05 01:19:12 +00:00
movl 20(%esp),%ecx
Eliminate superfluous memory access in memcpy(3)/memmove(3). Obtained from: NetBSD MFC after: 1 week
2002-10-15 09:50:07 +00:00
movl %edi,%edx
subl %esi,%edx
cmpl %ecx,%edx /* overlapping? */
Be smarter about handling overlapped copies and only go backwards if it is really necessary. Going backwards on a P6 is much slower than forwards and it's a little slower on a P5. Also moved the count mask and 'std' down a few lines - it's a couple percent faster this way on a P5.
1995-12-27 18:47:45 +00:00
jb 1f
First crack at making libc work with the new make macros. It compiles on my machine, and a simple static (genassym) and shared (sysctl) executable both work. Still to be done: RPCand YP merge.
1994-08-05 01:19:12 +00:00
cld /* nope, copy forwards. */
Eliminate superfluous memory access in memcpy(3)/memmove(3). Obtained from: NetBSD MFC after: 1 week
2002-10-15 09:50:07 +00:00
movl %ecx,%edx
First crack at making libc work with the new make macros. It compiles on my machine, and a simple static (genassym) and shared (sysctl) executable both work. Still to be done: RPCand YP merge.
1994-08-05 01:19:12 +00:00
shrl $2,%ecx /* copy by words */
rep
movsl
Eliminate superfluous memory access in memcpy(3)/memmove(3). Obtained from: NetBSD MFC after: 1 week
2002-10-15 09:50:07 +00:00
movl %edx,%ecx
First crack at making libc work with the new make macros. It compiles on my machine, and a simple static (genassym) and shared (sysctl) executable both work. Still to be done: RPCand YP merge.
1994-08-05 01:19:12 +00:00
andl $3,%ecx /* any bytes left? */
rep
movsb
popl %edi
popl %esi
ret
1:
addl %ecx,%edi /* copy backwards. */
addl %ecx,%esi
Merged with the 1996/11/12 NetBSD version: - use a slightly less bogus copyright. This file was never contributed to Berkeley. It still claims to be copright by the Regents. - use <machine/asm.h> instead of "DEFS.h". - use RCSID($Id$) instead of explicit assembly code and messy ifdefs. The rcsid won't be put into the object file until we make RCSID() non-null. NetBSD uses a LIBC_SCCS ifdef here. We used a LIBC_RCS instead, but I want RCSID() to be controlled directly by LIBC_RCS (actually by LIB_RCS). This is the only difference with the NetBSD version. - added ifdefs to support generation of memcpy() and memmove(). The other changes are "while I'm here" to get this. - improved style of the copy backwards case.
1997-04-20 12:09:18 +00:00
std
Eliminate superfluous memory access in memcpy(3)/memmove(3). Obtained from: NetBSD MFC after: 1 week
2002-10-15 09:50:07 +00:00
movl %ecx,%edx
Merged with the 1996/11/12 NetBSD version: - use a slightly less bogus copyright. This file was never contributed to Berkeley. It still claims to be copright by the Regents. - use <machine/asm.h> instead of "DEFS.h". - use RCSID($Id$) instead of explicit assembly code and messy ifdefs. The rcsid won't be put into the object file until we make RCSID() non-null. NetBSD uses a LIBC_SCCS ifdef here. We used a LIBC_RCS instead, but I want RCSID() to be controlled directly by LIBC_RCS (actually by LIB_RCS). This is the only difference with the NetBSD version. - added ifdefs to support generation of memcpy() and memmove(). The other changes are "while I'm here" to get this. - improved style of the copy backwards case.
1997-04-20 12:09:18 +00:00
andl $3,%ecx /* any fractional bytes? */
First crack at making libc work with the new make macros. It compiles on my machine, and a simple static (genassym) and shared (sysctl) executable both work. Still to be done: RPCand YP merge.
1994-08-05 01:19:12 +00:00
decl %edi
decl %esi
rep
movsb
Eliminate superfluous memory access in memcpy(3)/memmove(3). Obtained from: NetBSD MFC after: 1 week
2002-10-15 09:50:07 +00:00
movl %edx,%ecx /* copy remainder by words */
First crack at making libc work with the new make macros. It compiles on my machine, and a simple static (genassym) and shared (sysctl) executable both work. Still to be done: RPCand YP merge.
1994-08-05 01:19:12 +00:00
shrl $2,%ecx
subl $3,%esi
subl $3,%edi
rep
movsl
popl %edi
popl %esi
cld
ret
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