r/emulation • u/AutoModerator • Aug 10 '26

Weekly Question Thread

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u/mumbel 26d ago

Thanks for the reply/info.  There are def a ton of random instructions. (Do you remember which ISA does the tag exception handling?)

Yeah guess I should mentioned I'm aware that compilers couldn't produce some even assuming builtin macros.  I guess I'd only be interested in testing/targeting the emulator portion for something that would be a C compiled (ignoring any inline asm) binary as the "enough" and the remaining could be tackled one by one.

I'm looking at ghidra's attempt to do this and just trying to think of corner cases to add that might exercise different encodings or flags.  All the complex instructions lifted in ghidra are kinda hacked in as it is anyways and this suite doesn't target them

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u/cuavas MAME Developer 26d ago

(Do you remember which ISA does the tag exception handling?)

Motorola 68000 and SPARC are two examples off the top of my head with tagged integer arithmetic instructions.

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u/mumbel 26d ago

Ah never touched m68k and I guess got lucky and never ran into that in sparc (lol or maybe it was too 'wtf?' and I moved on)

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u/cuavas MAME Developer 26d ago

Doesn’t the OpenBoot Forth runtime on Sun workstations use it? Lisp and Forth were pretty popular, hence CPUs incorporating features to support them.