33 lines
535 B
ArmAsm
33 lines
535 B
ArmAsm
.define .inn
|
|
.sect .text
|
|
.sect .rom
|
|
.sect .data
|
|
.sect .bss
|
|
.sect .text
|
|
|
|
.inn: ! d0 bitnumber
|
|
! d1 setsize in bytes
|
|
! on exit: 0 or 1 in d0
|
|
|
|
move.l d2, -(sp)
|
|
move.l d0, d2
|
|
asr.l #3, d2 ! offset .sect from sp in bytes
|
|
eor.l #3, d2 ! longs are stored in high-to-low order
|
|
cmp.l d1, d2
|
|
bge 1f ! bitnumber too large
|
|
btst d0, 8(sp, d2.l)
|
|
beq 2f
|
|
move.l #1, d0
|
|
bra 3f
|
|
1:
|
|
move.l #ESET, -(sp)
|
|
jsr .trp
|
|
2:
|
|
clr.l d0
|
|
3:
|
|
move.l (sp)+, d2
|
|
move.l (sp)+, a0 ! return address
|
|
add.l d1, sp ! pop bitset
|
|
jmp (a0) ! return
|
|
.align 2
|