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NetBSD/lib/libc/arch/i386/stdlib/div.S

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Provide i386 versions of div and ldiv -- they are simpler than the C versions, since the idiv instruction does the right thing wrt truncating towards zero.
1993-10-09 02:57:13 +03:00
/*
* Copyright (c) 1993 Winning Strategies, Inc.
* 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. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by Winning Strategies, Inc.
* 4. The name of the author may not be used to endorse or promote products
Fix spelling error in Copyright notice
1994-01-28 23:34:33 +03:00
* derived from this software without specific prior written permission
Provide i386 versions of div and ldiv -- they are simpler than the C versions, since the idiv instruction does the right thing wrt truncating towards zero.
1993-10-09 02:57:13 +03:00
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 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.
*
Use RCSID macro.
1994-03-12 04:48:26 +03:00
* $Id: div.S,v 1.4 1994/03/12 01:48:27 jtc Exp $
Provide i386 versions of div and ldiv -- they are simpler than the C versions, since the idiv instruction does the right thing wrt truncating towards zero.
1993-10-09 02:57:13 +03:00
*/
Use RCSID macro.
1994-03-12 04:48:26 +03:00
#include <machine/asm.h>
Change instances of LIBC_RCS back to LIBC_SCCS. If we are going to change th LIBC_RCS, the entire source tree should be updated at once. Remove && !defined(lint) from conditionals around rcs id's. No one is ever going to pass a *.s file through lint.
1993-10-21 04:39:55 +03:00
#if defined(LIBC_SCCS)
Use RCSID macro.
1994-03-12 04:48:26 +03:00
RCSID("$Id: div.S,v 1.4 1994/03/12 01:48:27 jtc Exp $")
Change instances of LIBC_RCS back to LIBC_SCCS. If we are going to change th LIBC_RCS, the entire source tree should be updated at once. Remove && !defined(lint) from conditionals around rcs id's. No one is ever going to pass a *.s file through lint.
1993-10-21 04:39:55 +03:00
#endif
Provide i386 versions of div and ldiv -- they are simpler than the C versions, since the idiv instruction does the right thing wrt truncating towards zero.
1993-10-09 02:57:13 +03:00
ENTRY(div)
movl 4(%esp),%eax
movl 8(%esp),%ecx
cdq
idiv %ecx
movl %eax,4(%esp)
movl %edx,8(%esp)
ret