source: trunk/minix/lib/i86/em/em_exg.s@ 9

Last change on this file since 9 was 9, checked in by Mattia Monga, 14 years ago

Minix 3.1.2a
File size: 200 bytes
Line 
1.define .exg
2
3 ! #bytes in cx
4.text
5.exg:
6 push di
7 mov sp,di
8 add di,#4
9 mov bx,di
10 add bx,cx
11 sar cx,#1
121:
13 mov ax,(bx)
14 xchg ax,(di)
15 mov (bx),ax
16 add di,#2
17 add bx,#2
18 loop 1b
192:
20 pop di
21 ret
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