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Date: Sun, 6 Aug 2017 22:48:55 -0700 (PDT)
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Subject: Re: Unhandled Exception in Tartan generated code for M68040
From: Petter Fryklund <petter.fryklund@atero.se>
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Xref: news.eternal-september.org comp.lang.ada:47629
Date: 2017-08-06T22:48:55-07:00
List-Id: <comp.lang.ada>

Den onsdag 12 juli 2017 kl. 21:30:28 UTC+2 skrev Niklas Holsti:
> On 17-07-07 12:58 , Petter Fryklund wrote:
> > Hi, I'm trying to locate an Unhandled Exception. The printout
> > received is
> >
> > Unhandled Exception vector 37 at 45E6C
> >
> > or
> >
> > Unhandled Exception vector 18 at 10A40E
> >
> > I assume there is a way to use the .map file to find out where these
> > exceptions occur, but endless googling has come up with nil.
> 
> And in another message, Petter continued:
> 
>  > the Unexpected Exception is erronous, the code has exception
>  > handler everywhere.
> 
> Are you sure, Petter, that "exception" in "Unhandled Exception" means an 
> Ada exception? I seem to remember that some processors use the term 
> "exception" for what is more commonly called a "trap". Perhaps these are 
> HW traps that are _not_ mapped to Ada exceptions?
> 
> The Wikipedia page on M68000 
> (https://en.wikipedia.org/wiki/Motorola_68000_series) uses the term 
> "exception" for HW events,and so does the M68040 User Manual 
> (http://cache.freescale.com/files/32bit/doc/ref_manual/MC68040UM.pdf).
> 
> Table 8-1 in the User Manual lists these HW exceptions, by number. It 
> seems that numbers 32..47 are of SW origin, triggered by the TRAP 
> instruction, while number 18 is described as "Unassigned, Reserved". 
> Numbers 25..31 are "Interrupt Autovectors". This suggests that these HW 
> exceptions should be treated as interrupts in the Ada program, that is, 
> processed by interrupt handlers, not by exception handlers. On the other 
> hand, the Tartan run-time system may map some of these HW exceptions to 
> Ada exceptions, for example number 5, which is "Integer Divide by Zero".
> 
> (Disclaimer: I know nothing about the Tartan compiler.)
> 
> -- 
> Niklas Holsti
> Tidorum Ltd
> niklas holsti tidorum fi
>        .      @       .

Thanks for responding, Niklas.
Your suggestion makes sense since one would expect the program to stop on an Unhandled Exception, but it continues. But I cannot figure out what the 6 digit hex number is in that case.

Regards,
Petter