Re: [Valgrind-developers] Supporting the x86 INT instructionin Valgrind

[Steve B. <Ste...@an...>]

Hi Julian,

>I'm looking at reimplementing INT in Valgrind 3.  V3 has a completely
>new JIT compared to Valgrind 2, and INT died in the transition
>(obviously int $0x80 works, but nothing else).
>
>So I'm trying to understand the requirements people have.  
>
>Chris, you appear to require that execution of int3 causes SIGTRAP 
>to be delivered.  
>
>Steve, you appear to require that execution of int $0x40 .. $0x43
>cause SIGTRAP to be delivered?
>  
>
My requirements are really just that I see the same behavior under 
valgrind as when running natively, given that we do use int 
$0x40...$0x43.  As I understand it, we just get a signal which looks 
like a SIGSEGV and we figure things out from there by looking at the gregs.

I've attached the correspondance I had with Jeremy which lead to his fix.

Cheers,

--Steve