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* doc/sdccman.lyx,
[fw/sdcc]
/
device
/
lib
/
gbz80
/
crt0.s
1
;; Generic crt0.s for a GBZ80
2
.globl _main
3
4
.area _HEADER (ABS)
5
;; Reset vector
6
.org 0
7
jp init
8
9
.org 0x08
10
reti
11
.org 0x10
12
reti
13
.org 0x18
14
reti
15
.org 0x20
16
reti
17
.org 0x28
18
reti
19
.org 0x30
20
reti
21
.org 0x38
22
reti
23
24
.org 0x100
25
jp 0x150
26
27
.org 0x150
28
init:
29
di
30
;; Stack at the top of memory.
31
ld sp,#0xdfff
32
33
;; Setup global data
34
call gsinit
35
36
;; Use _main instead of main to bypass sdcc's intelligence
37
call _main
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jp _exit
39
40
;; Ordering of segments for the linker.
41
.area _HOME
42
.area _CODE
43
.area _GSINIT
44
.area _GSFINAL
45
46
.area _DATA
47
.area _BSS
48
.area _HEAP
49
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.area _CODE
51
__clock::
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ld a,#2
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rst 0x08
54
ret
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56
_exit::
57
;; Exit - special code to the emulator
58
ld a,#0
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rst 0x08
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1$:
61
halt
62
jr 1$
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.area _GSINIT
65
gsinit::
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67
.area _GSFINAL
68
ret