54 lines
1,012 B
ArmAsm
54 lines
1,012 B
ArmAsm
.define .lar
|
|
.sect .text
|
|
.sect .rom
|
|
.sect .data
|
|
.sect .bss
|
|
.sect .text
|
|
EILLINS=18
|
|
! (on entry d0 contains the integer size in the descriptor)
|
|
.lar:
|
|
cmp.l #4, d0
|
|
beq 9f
|
|
move.l #EILLINS, -(sp)
|
|
jmp (.fatal)
|
|
9:
|
|
! register usage:
|
|
! a0: descriptor address
|
|
! a1: base address
|
|
! d0: index
|
|
! d1: # bytes / element
|
|
|
|
! For address calculation; see comment in 'aar.s'.
|
|
|
|
move.l (sp)+, d1 ! return address
|
|
move.l (sp)+, a0 ! descriptor address
|
|
move.l (sp)+, d0 ! index
|
|
move.l (sp)+, a1 ! array base address
|
|
sub.l (a0), d0 ! relative index
|
|
move.l d1,-(sp)
|
|
move.l (8,a0), d1 ! # bytes / element
|
|
cmp.l #1, d1
|
|
bne 2f
|
|
move.l (sp),a0
|
|
clr.l (sp)
|
|
move.b (a1,d0.l), (3,sp) ! one byte element
|
|
jmp (a0)
|
|
2:
|
|
cmp.l #2, d1
|
|
bne 4f
|
|
move.l (sp),a0
|
|
clr.l (sp)
|
|
move.w (a1,d0.l*2), (2,sp) ! two byte element
|
|
jmp (a0)
|
|
4:
|
|
muls.l d1, d0
|
|
add.l d0, a1 ! address of 4n byte element
|
|
add.l d1, a1 ! because of predecrement
|
|
asr.l #2, d1
|
|
move.l (sp)+,a0
|
|
1:
|
|
move.l -(a1), -(sp)
|
|
sub.l #1, d1
|
|
bne 1b
|
|
jmp (a0)
|
|
.align 2
|