"il" exception mask

jotd · 13 April 2016, 23:36

Hi,

Default "il" traps exceptions but also VBL interrupts, ...

What's the correct mask for all types of illegal/line-f/read on odd address on 68000 exceptions?

Toni Wilen · 16 April 2016, 19:22

Default mask does not include interrupt exceptions.

Each bit equals exception vector number: bit 2 = bus error, bit 3 = address error and so on. (0 and 1 are unused, CPU uses them only in reset exception) Check i instruction output for exception numbers (or check Motorola documentation but it is far too boring!)

Mask FFFF matches all vectors from 0 to 15 which includes all usual "something went wrong" exceptions.

(There is also interesting bug, it is 64-bit mask but read function is only 32-bit so it is not possible to manually set any exception vectors >= 32 masks.. This will be fixed in next beta)

13 April 2016, 23:36	#1
jotd This cat is no more Join Date: Dec 2004 Location: FRANCE Age: 52 Posts: 8,318	"il" exception mask Hi, Default "il" traps exceptions but also VBL interrupts, ... What's the correct mask for all types of illegal/line-f/read on odd address on 68000 exceptions?

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16 April 2016, 19:22	#2
Toni Wilen WinUAE developer Join Date: Aug 2001 Location: Hämeenlinna/Finland Age: 49 Posts: 26,535	Default mask does not include interrupt exceptions. Each bit equals exception vector number: bit 2 = bus error, bit 3 = address error and so on. (0 and 1 are unused, CPU uses them only in reset exception) Check i instruction output for exception numbers (or check Motorola documentation but it is far too boring!) Mask FFFF matches all vectors from 0 to 15 which includes all usual "something went wrong" exceptions. (There is also interesting bug, it is 64-bit mask but read function is only 32-bit so it is not possible to manually set any exception vectors >= 32 masks.. This will be fixed in next beta)

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