Re: Translate signal to C++ exception

[Kamil Rytarowski <n54%gmx.com@localhost>]

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On 10.04.2016 09:07, Martin Husemann wrote:
> On Sat, Apr 09, 2016 at 11:06:56PM +0200, Kamil Rytarowski wrote:
>>> Are we talking about sync or async signals? For sync signals,
>>> it is no big issue. Async signals are a whole lot different and
>>>  sigaltstack is difficult to avoid for them.
>>> 
>> 
>> SIGSEGV from the code, I assume it's synchronous one from the
>> program point of view.
> 
> What about FP exceptions?
> 
> It probably would help if you post the complete list of exceptions 
> generated and the siginfo details (there must be a mapping in the 
> code), as from windows background I would expect it to be very
> limited and far away from the general case.
> 

For now all exceptions to handle is bad memory address write or read.
I expect also division by 0 - but it will pop up in tests with running
the managed code.

Ithers like stack overflow are to be ignored.

> Couldn't we arrange for a special return trampoline that is
> registered upfront with a per thread exception object for each
> mapping, then fill it in the handler with usefull information and
> have the trampoline return it as the exception object? And have the
> application abort on recursive exceptions of the same type?
> 

Is it doable with 7.0 (if not in 7.0.1/7.1?)? If so how? I was looking
at API to register new trampoline, it's available in the GNU world but
I missed this possibility in our case.

I also noted that our trampoline isn't recognized by GDB, I wasn't
investigating it deeply.. but shouldn't the code use CFI markers? I
will try to research it prepare a patch and see what happens.

> Martin
> 

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