| 1 | /* |
| 2 | * poly_mul64.S |
| 3 | * |
| 4 | * Multiply two 64 bit integers. |
| 5 | * |
| 6 | * Call from C as: |
| 7 | * void mul64(long long *a, long long *b, long long *result) |
| 8 | * |
| 9 | * |
| 10 | * Copyright (C) 1992, 1993 W. Metzenthen, 22 Parker St, Ormond, |
| 11 | * Vic 3163, Australia. |
| 12 | * E-mail apm233m@vaxc.cc.monash.edu.au |
| 13 | * All rights reserved. |
| 14 | * |
| 15 | * This copyright notice covers the redistribution and use of the |
| 16 | * FPU emulator developed by W. Metzenthen. It covers only its use |
| 17 | * in the 386BSD operating system. Any other use is not permitted |
| 18 | * under this copyright. |
| 19 | * |
| 20 | * Redistribution and use in source and binary forms, with or without |
| 21 | * modification, are permitted provided that the following conditions |
| 22 | * are met: |
| 23 | * 1. Redistributions of source code must retain the above copyright |
| 24 | * notice, this list of conditions and the following disclaimer. |
| 25 | * 2. Redistributions in binary form must include information specifying |
| 26 | * that source code for the emulator is freely available and include |
| 27 | * either: |
| 28 | * a) an offer to provide the source code for a nominal distribution |
| 29 | * fee, or |
| 30 | * b) list at least two alternative methods whereby the source |
| 31 | * can be obtained, e.g. a publically accessible bulletin board |
| 32 | * and an anonymous ftp site from which the software can be |
| 33 | * downloaded. |
| 34 | * 3. All advertising materials specifically mentioning features or use of |
| 35 | * this emulator must acknowledge that it was developed by W. Metzenthen. |
| 36 | * 4. The name of W. Metzenthen may not be used to endorse or promote |
| 37 | * products derived from this software without specific prior written |
| 38 | * permission. |
| 39 | * |
| 40 | * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, |
| 41 | * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY |
| 42 | * AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL |
| 43 | * W. METZENTHEN BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, |
| 44 | * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, |
| 45 | * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR |
| 46 | * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF |
| 47 | * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING |
| 48 | * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS |
| 49 | * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| 50 | * |
| 51 | */ |
| 52 | |
| 53 | |
| 54 | #include "fpu_asm.h" |
| 55 | |
| 56 | .text |
| 57 | .align 2,144 |
| 58 | .globl _mul64 |
| 59 | _mul64: |
| 60 | pushl %ebp |
| 61 | movl %esp,%ebp |
| 62 | subl $16,%esp |
| 63 | pushl %esi |
| 64 | pushl %ebx |
| 65 | |
| 66 | movl PARAM1,%esi |
| 67 | movl PARAM2,%ecx |
| 68 | movl PARAM3,%ebx |
| 69 | |
| 70 | xor %eax,%eax |
| 71 | movl %eax,-4(%ebp) |
| 72 | movl %eax,-8(%ebp) |
| 73 | |
| 74 | movl (%esi),%eax |
| 75 | mull (%ecx) |
| 76 | movl %eax,-16(%ebp) /* Not used */ |
| 77 | movl %edx,-12(%ebp) |
| 78 | |
| 79 | movl (%esi),%eax |
| 80 | mull 4(%ecx) |
| 81 | addl %eax,-12(%ebp) |
| 82 | adcl %edx,-8(%ebp) |
| 83 | adcl $0,-4(%ebp) |
| 84 | |
| 85 | movl 4(%esi),%eax |
| 86 | mull (%ecx) |
| 87 | addl %eax,-12(%ebp) |
| 88 | adcl %edx,-8(%ebp) |
| 89 | adcl $0,-4(%ebp) |
| 90 | |
| 91 | movl 4(%esi),%eax |
| 92 | mull 4(%ecx) |
| 93 | addl %eax,-8(%ebp) |
| 94 | adcl %edx,-4(%ebp) |
| 95 | |
| 96 | testb $128,-9(%ebp) |
| 97 | je L_no_round |
| 98 | |
| 99 | addl $1,-8(%ebp) |
| 100 | adcl $0,-4(%ebp) |
| 101 | |
| 102 | L_no_round: |
| 103 | movl -8(%ebp),%esi |
| 104 | movl %esi,(%ebx) |
| 105 | movl -4(%ebp),%esi |
| 106 | movl %esi,4(%ebx) |
| 107 | |
| 108 | popl %ebx |
| 109 | popl %esi |
| 110 | leave |
| 111 | ret |