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Old 23 November 2015, 18:26   #1
HanSolo
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68060 unimplemented opcodes ?

Hi. I just enabled logging in winuae to find reaseon why gloom3/4 crashing and I saw some spooky warnings about unimplemented opcodes (00F8 and 4C3C).What does it mean ? Wrong config ?
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Old 23 November 2015, 19:50   #2
Toni Wilen
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If it goes away with unimplemented CPU emu ticked: it needs 68060.library. 4C3C = MULL, some MULL variants are not implemented in 68060.

00F8 probably is a side-effect of some other problem.

EDIT: It could be normal and crash is due to too small stack or some other "usual" reason. (if ticking/unticked makes no difference)
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Old 23 November 2015, 21:20   #3
Mrs Beanbag
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00F8 seems to be cmp2.b #data.w, Rn
this is also software supported on 68060
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Old 24 November 2015, 09:21   #4
Toni Wilen
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CMP2 or CHK2, opcode is not enough to know which one (selection bit is in second opcode word). It still sounds like side-effect of some other problem, CMP2/CHK2 is used very very rarely.
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Old 24 November 2015, 09:45   #5
meynaf
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I remember having used CMP2 one day. It may have its uses and appear here and there. Nobody can disassemble all the code that exists

However 00F8 could be start of a ROM address. Original vector table contains many of them. A JMP gone nuts can have jumped there by mistake, like from a null pointer.
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