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Cream of the Crop 1
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Cream of the Crop 1.iso
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PROGRAM
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DJLSR106.ARJ
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BCOPY.S
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1992-03-02
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980b
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50 lines
/* This is file BCOPY.S */
/*
** Copyright (C) 1991 DJ Delorie, 24 Kirsten Ave, Rochester NH 03867-2954
**
** This file is distributed under the terms listed in the document
** "copying.dj", available from DJ Delorie at the address above.
** A copy of "copying.dj" should accompany this file; if not, a copy
** should be available from where this file was obtained. This file
** may not be distributed without a verbatim copy of "copying.dj".
**
** This file is distributed WITHOUT ANY WARRANTY; without even the implied
** warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
*/
/*
* bcopy (src,dst,cnt)
*/
.globl _bcopy
_bcopy:
pushl %ebp
movl %esp,%ebp
pushl %esi
pushl %edi
movl 8(%ebp),%esi
movl 12(%ebp),%edi
movl 16(%ebp),%ecx
movl $0,%eax
jecxz L2
cld
cmp %esi,%edi
jb L3
std
addl %ecx,%esi
addl %ecx,%edi
decl %esi
decl %edi
L3:
rep
movsb
L2:
cld
popl %edi
popl %esi
leave
ret