40 lines
649 B
ArmAsm
40 lines
649 B
ArmAsm
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.define .csb8
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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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.csb8:
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! case descriptor in a0
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! index in (sp)
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move.l (a0)+, a1 ! default jump address
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move.l (sp)+, d2
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move.l (sp), a2 ! index in d2:a2
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move.l d7, (sp)
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add.l #4, a0
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move.l (a0)+, d1 ! # entries (assuming <= 65536)
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beq 3f
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sub.l #1, d1
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1:
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move.l (a0)+, d0
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move.l (a0)+, d7 ! descriptor's index in d0:d7
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add.l #4, a0
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sub.l a2, d7
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subx.l d2, d0 ! descriptor's index - our index
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dbeq d1, 1b
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bne 3f
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move.l (-4,a0), a1 ! jump address
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3:
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move.l (sp)+, d7 ! caller's d7
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move.l a1, d0
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beq 4f
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jmp (a1)
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4:
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move.l #ECASE, -(sp)
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jmp (.fatal)
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.align 2
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