[haiku-development] Re: Question on the arch_cpu_user_memcpy function

On 2009-10-02 at 09:06:57 [+0800], David McPaul <dlmcpaul@xxxxxxxxx> wrote:
> 
> I am tracing through an issue I am having when using the profile tool
> to profile media add-ons

It's not by any chance the problem you mentioned month ago and still haven't 
created a ticket for? :-)

> I get a General Protection Fault code 0x0 in the arch_cpu_user_memcpy
> function when the profiler is trying to get the frame stack details
> 
> The registers printed in the error stack trace show that the src ptr is NULL
> 
> My reading of the code suggests that the error should be trapped and
> -1 returned by the function.
> 
> Am I wrong here, does the fault handler added not handle a null pointer?

It should indeed handle anything that causes a page fault, including read or 
write access to address 0.

Unless you insist on fixing the problem yourself, please create a ticket. If 
I can reproduce the bug, I'll fix it. Otherwise I or others might at least be 
able to add helpful insights.

CU, Ingo

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