104 lines
1.8 KiB
ArmAsm
104 lines
1.8 KiB
ArmAsm
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.define .sar
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.define .lar
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.define .aar
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!register usage:
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! a0 : descriptor address
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! d0 : index
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! a1 : base address
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.text
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.aar:
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movem.l d0/d1/a0/a1,.savreg
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move.l (sp)+,.retara ! return address
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move.l (sp)+,a0 ! descriptor address
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move.l (sp)+,d0 ! index
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move.l (sp)+,a1 ! base address
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sub.l (a0),d0 ! index - lower bound : relative index
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move.l 8(a0),-(sp) ! # bytes / element
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move.l d0,-(sp)
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jsr .mlu
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add.l d1,a1 ! address of element
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move.l a1,-(sp) ! returned on stack
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move.l .retara,-(sp)
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movem.l d0/d1/a0/a1,.savreg
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rts
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.lar:
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! register usage: like .aar
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! d2 : # bytes / element
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movem.l d0/d1/d2/a0/a1,.savreg
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move.l (sp)+,.retara ! return address
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move.l (sp)+,a0
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move.l (sp)+,d0
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move.l (sp)+,a1
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sub.l (a0),d0
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move.l 8(a0),d2 ! # bytes / element
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move.l d0,-(sp)
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move.l d2,-(sp)
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jsr .mlu
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add.l d1,a1 ! address of element
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add.l d2,a1 ! a1++ because of predecrement
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clr.l d1 !?nodig?
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asr #1,d2
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bne 3f
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move.b -(a1),d1 ! 1 byte element
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move.l d1,-(sp)
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bra 5f
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3:
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asr #1,d2
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bne 4f
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move.w -(a1),d1 ! 2 byte element
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move.l d1,-(sp)
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bra 5f
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4:
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sub.l #1,d2
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1:
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move.l -(a1),-(sp) ! 4n byte element (n = 1,2,...)
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dbf d2,1b
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5:
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move.l .retara,-(sp)
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movem.l .savreg,d0/d1/d2/a0/a1
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rts
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.sar:
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!register usage: same as lar
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movem.l d0/d1/a0/a1,.savreg
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move.l (sp)+,.retara
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move.l (sp)+,a0
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move.l (sp)+,d0
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move.l (sp)+,a1
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sub.l (a0),d0
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move.l 8(a0),d2 ! # bytes / element
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move.l d0,-(sp)
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move.l d2,-(sp)
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jsr .mlu
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add.l d1,a1
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clr.l d1 !?nodig?
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asr #1,d2
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bne 3f
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move.l (sp)+,d1
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move.b d1,(a1) ! 1 byte element
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bra 4f
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3:
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asr #1,d2
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bne 5f
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move.l (sp)+,d1
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move.w d1,(a1) ! 2 byte element
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bra 4f
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5:
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sub.l #1,d2
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1:
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move.l (sp)+,(a1)+ ! 4n byte element (n = 1,2,...)
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dbf d2,1b
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4:
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move.l .retara,-(sp)
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movem.l .savreg,d0/d1/a0/a1
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rts
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.data
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.retara: .long 0
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.align 2
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