40 lines
652 B
ArmAsm
40 lines
652 B
ArmAsm
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.define .csa8
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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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ECASE=20
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.sect .text
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.csa8:
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! jump table address in a0
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! index in (sp)
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move.l (a0)+, a1 ! default address
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move.l (sp)+, d0
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move.l (sp)+, d1 ! index
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move.l (a0)+, d2
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sub.l (a0)+, d1
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subx.l d2, d0 ! index - lower bound in d0:d1
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move.l d1, a2
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move.l (a0)+, d2
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move.l (a0)+, d1 ! upper - lower bound
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sub.l a2, d1
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subx.l d0, d2 ! upper - index
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bcs 1f
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move.l a2, d1
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! assuming d0:d1 < 65536
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move.l (a0,d1.l*4), d1 ! jump address
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beq 1f
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move.l d1,a1
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jmp (a1)
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1:
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move.l a1, d0
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beq 2f
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jmp (a1) ! jump to specified address
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2:
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move.l #ECASE, -(sp)
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jmp (.fatal)
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.align 2
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