34 lines
613 B
ArmAsm
34 lines
613 B
ArmAsm
.define .csa
|
|
.sect .text
|
|
.sect .rom
|
|
.sect .data
|
|
.sect .bss
|
|
.sect .text
|
|
|
|
.sect .text
|
|
|
|
!r0 contains index
|
|
!r1 contains pointer to csa descriptor
|
|
.csa: movd 4(r1), r2 !get lower bound
|
|
cmpd r2, r0
|
|
bgt 1f !index out of range
|
|
addd 8(r1), r2 !get upper bound
|
|
cmpd r2, r0
|
|
blt 1f !index out of range
|
|
addr 12(r1), r2 !pointer to first pointer
|
|
subd 4(r1), r0
|
|
muld 4, r0
|
|
addd r0,r2 !right pointer
|
|
cmpqd 0, 0(r2)
|
|
beq 1f !null pointer
|
|
movd 0(r2), tos !jump now
|
|
ret 4
|
|
1: !jump to default pointer
|
|
cmpqd 0, 0(r1)
|
|
beq 2f !null pointer
|
|
movd 0(r1), tos
|
|
ret 4
|
|
2:
|
|
movd ECASE, tos
|
|
jsr @.trp
|
|
ret 0
|