[uml-devel] Getting fault address from a SIGSEGV

[uml-devel] Getting fault address from a SIGSEGV

[Mattia Belletti]

Hi all, 

   For a project I'm working on, I would need to get the fault address of
a ptraced child, whose SIGSEGV I've caught. I've tried to dig in UML 
source code to get how this is done, but I get lost after having 
followed the chain segv_handler <- sig_info <- sig_handler_common_tt <-
"r = &TASK_REGS(get_current())->tt;", since there the status I was 
looking for is stored in the thread_struct.regs, but I don't know where 
in the code such status is filled, and so where such information is 
taken from :-)
 

Hope you can light my way through the code ;-) 


-- 
Mat/tia Belletti             - Graduate student @ cs.unibo.it
ICQ: 33292311                - email: mbellett@cs.unibo.it
IRC: RedGlow                 - site(s): http://mbellett.web.cs.unibo.it/
RedGlow@jabber.linux.it/Gaim - Linux user 299762 @ machine 213003


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Re: [uml-devel] Getting fault address from a SIGSEGV

[Jeff Dike]

mbellett@cs.unibo.it said:
> but I don't know where  in the code such status is filled, and so
> where such information is  taken from :-)

On x86 (and x86_64), the fault address is sigcontext.cr2, the access type is
stored in .err, and the CPU fault type is in .trapno.

				Jeff



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