53 lines
981 B
ArmAsm
53 lines
981 B
ArmAsm
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.define .lar
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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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.sect .text
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! (on entry d0 contains the integer size in the descriptor)
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.lar:
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cmp.l #4, d0
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beq 9f
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move.l #EILLINS, -(sp)
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jmp (.fatal)
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9:
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! register usage:
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! a0: descriptor address
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! a1: base address
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! d0: index
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! d1: # bytes / element
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! d2: save return address
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! For address calculation; see comment in 'aar.s'.
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move.l (sp)+, d2 ! 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 ! array base address
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sub.l (a0), d0 ! relative index
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move.l (8,a0), d1 ! # bytes / element
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cmp.l #1, d1
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bne 2f
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clr.l -(sp)
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move.b (a1,d0.l), (3,sp) ! one byte element
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bra 5f
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2:
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cmp.l #2, d1
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bne 4f
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clr.l -(sp)
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move.w (a1,d0.l*2), (2,sp) ! two byte element
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bra 5f
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4:
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muls.l d1, d0
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add.l d0, a1 ! address of 4n byte element
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add.l d1, a1 ! because of predecrement
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asr.l #2, d1
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sub.l #1, d1
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1:
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move.l -(a1), -(sp)
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dbf d1, 1b
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5:
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move.l d2,a0
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jmp (a0)
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.align 2
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