1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
|
/*
* a simple program to copy a string
* showing correct syntax, delay slots, and use of annul bit.
* pseudo-operations: .set, .global, .asciz, .skip
* synthetic instructions: set, ret, retl, mov, inc, deccc, nop
* symbolic substitution: WINDOWSIZE
*
*
* This example must be compiled on a SPARCstation, ugh!
*
* as -P -o sample.o sample.s
* ld -e main sample.o -o sample
*/
.seg "text"
.global main
main:
save %sp, -64, %sp
set str, %o0 ! source string
nop
set stout, %o1
call bcopy
mov 24, %o2 ! delay slot, length to copy
exit:
ta 0
! ret
restore
.global bcopy
continue:
inc %o0 ! inc from address
stb %o4, [%o1] ! write to address
inc %o1 ! in the delay slot: inc to add
bcopy:
subcc %o2, 1, %o2 ! dec count, set condition codes
bge,a continue ! loop until done
ldub [%o0], %o4 ! delay slot: read from address
retl ! leaf routine return
nop
.seg "data"
str:
.asciz "this is a sample string"
stout:
.word 0
.word 0
.word 0
.word 0
.word 0
.word 0
.word 0
.word 0
.word 0
|
