123 lines
3.5 KiB
ArmAsm
123 lines
3.5 KiB
ArmAsm
/*
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* poly_mul64.S
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*
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* Multiply two 64 bit integers.
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*
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* Call from C as:
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* void mul64(long long *a, long long *b, long long *result)
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*
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*
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* Copyright (C) 1992,1993,1994
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* W. Metzenthen, 22 Parker St, Ormond, Vic 3163,
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* Australia. E-mail billm@vaxc.cc.monash.edu.au
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* All rights reserved.
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*
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* This copyright notice covers the redistribution and use of the
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* FPU emulator developed by W. Metzenthen. It covers only its use
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* in the 386BSD, FreeBSD and NetBSD operating systems. Any other
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* use is not permitted under this copyright.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must include information specifying
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* that source code for the emulator is freely available and include
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* either:
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* a) an offer to provide the source code for a nominal distribution
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* fee, or
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* b) list at least two alternative methods whereby the source
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* can be obtained, e.g. a publically accessible bulletin board
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* and an anonymous ftp site from which the software can be
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* downloaded.
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* 3. All advertising materials specifically mentioning features or use of
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* this emulator must acknowledge that it was developed by W. Metzenthen.
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* 4. The name of W. Metzenthen may not be used to endorse or promote
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* products derived from this software without specific prior written
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* permission.
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*
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* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
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* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
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* AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
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* W. METZENTHEN BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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*
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* The purpose of this copyright, based upon the Berkeley copyright, is to
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* ensure that the covered software remains freely available to everyone.
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*
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* The software (with necessary differences) is also available, but under
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* the terms of the GNU copyleft, for the Linux operating system and for
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* the djgpp ms-dos extender.
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*
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* W. Metzenthen June 1994.
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*
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*
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* $FreeBSD$
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*
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*/
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#include <gnu/i386/fpemul/fpu_asm.h>
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.text
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ENTRY(mul64)
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pushl %ebp
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movl %esp,%ebp
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subl $16,%esp
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pushl %esi
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pushl %ebx
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movl PARAM1,%esi
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movl PARAM2,%ecx
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movl PARAM3,%ebx
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xor %eax,%eax
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movl %eax,-4(%ebp)
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movl %eax,-8(%ebp)
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movl (%esi),%eax
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mull (%ecx)
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movl %eax,-16(%ebp) /* Not used */
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movl %edx,-12(%ebp)
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movl (%esi),%eax
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mull 4(%ecx)
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addl %eax,-12(%ebp)
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adcl %edx,-8(%ebp)
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adcl $0,-4(%ebp)
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movl 4(%esi),%eax
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mull (%ecx)
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addl %eax,-12(%ebp)
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adcl %edx,-8(%ebp)
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adcl $0,-4(%ebp)
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movl 4(%esi),%eax
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mull 4(%ecx)
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addl %eax,-8(%ebp)
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adcl %edx,-4(%ebp)
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testb $128,-9(%ebp)
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je L_no_round
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addl $1,-8(%ebp)
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adcl $0,-4(%ebp)
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L_no_round:
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movl -8(%ebp),%esi
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movl %esi,(%ebx)
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movl -4(%ebp),%esi
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movl %esi,4(%ebx)
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popl %ebx
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popl %esi
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leave
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ret
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