87 lines
1.1 KiB
ArmAsm
87 lines
1.1 KiB
ArmAsm
.define .sar
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.define .lar
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.define .aar
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.sect .text
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.sect .rom
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.sect .data
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.sect .bss
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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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.sect .text
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.aar:
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move.l (sp)+,d2 ! return address
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move.l (sp)+,a0
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move.w (sp)+,d0
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move.l (sp)+,a1
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sub (a0),d0 ! index - lower bound : relative index
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!chk 2(a0),d0
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!blt 9f
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!cmp 2(a0),d0
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!bgt 9f
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mulu 4(a0),d0 ! total # bytes
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add d0,a1 ! address of element
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move.l a1,-(sp)
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move.l d2,-(sp)
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rts
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.lar:
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move.l (sp)+,d2 ! return address
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move.l (sp)+,a0
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move.w (sp)+,d0
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move.l (sp)+,a1
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sub (a0),d0
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!chk 2(a0),d0
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!blt 9f
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!cmp 2(a0),d0
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!bgt 9f
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move 4(a0),d1
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mulu d1,d0
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add d0,a1
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add d1,a1
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asr #1,d1
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bne 3f
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clr d1
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move.b -(a1),d1
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move d1,-(sp)
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bra 4f
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3:
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move -(a1),-(sp)
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sub #1,d1
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bgt 3b
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4:
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move.l d2,-(sp)
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rts
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!9:
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!move.w #EARRAY,-(sp)
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!jmp .fat
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.sar:
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move.l (sp)+,d2
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move.l (sp)+,a0
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move.w (sp)+,d0
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move.l (sp)+,a1
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sub (a0),d0
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!chk 2(a0),d0
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!blt 9b
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!cmp 2(a0),d0
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!bgt 9b
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move 4(a0),d1
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mulu d1,d0
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add d0,a1
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asr #1,d1
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bne 3f
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move (sp)+,d1
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move.b d1,(a1)
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bra 4f
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3:
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move (sp)+,(a1)+
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sub #1,d1
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bgt 3b
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4:
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move.l d2,-(sp)
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rts
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