55 lines
1,002 B
ArmAsm
55 lines
1,002 B
ArmAsm
|
.define .sar
|
||
|
|
.sect .text
|
||
|
|
.sect .rom
|
||
|
|
.sect .data
|
||
|
|
.sect .bss
|
||
|
|
|
||
|
|
.sect .text
|
||
|
|
! (on entry d0 contains the integer size in the descriptor)
|
||
|
|
.sar:
|
||
|
|
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
|
||
|
|
! d2: return address
|
||
|
|
|
||
|
|
! For address calculation; see comment in 'aar.s'.
|
||
|
|
! If the element size is a fraction of EM_WSIZE (4)
|
||
|
|
! the calculation is done by adding.
|
||
|
|
|
||
|
|
move.l (sp)+, d2 ! return address
|
||
|
|
move.l (sp)+, a0
|
||
|
|
move.l (sp)+, d0
|
||
|
|
move.l (sp)+, a1
|
||
|
|
sub.l (a0), d0
|
||
|
|
move.l (8,a0), d1 ! # bytes / element
|
||
|
|
cmp.l #1, d1
|
||
|
|
bne 2f
|
||
|
|
move.l (sp)+, d1
|
||
|
|
move.b d1, (a1,d0.l) ! store one byte element
|
||
|
|
bra 5f
|
||
|
|
2:
|
||
|
|
cmp.l #2, d1
|
||
|
|
bne 4f
|
||
|
|
move.l (sp)+, d1
|
||
|
|
move.w d1, (a1,d0.l*2) ! store two byte element
|
||
|
|
bra 5f
|
||
|
|
4: ! here: 4n byte element
|
||
|
|
muls.l d1, d0
|
||
|
|
add.l d0, a1 ! address of 4n byte element
|
||
|
|
asr.l #2, d1
|
||
|
|
sub.l #1, d1
|
||
|
|
1:
|
||
|
|
move.l (sp)+, (a1)+
|
||
|
|
dbf d1, 1b
|
||
|
|
5:
|
||
|
|
move.l d2,a0
|
||
|
|
jmp (a0)
|
||
|
|
.align 2
|