[ros-kernel] Re: [ros-cvs] CVS Update: reactos- Supportof Matroxdisplay card

[Waldo Alvarez Cañizares]

Hi David:
 
hope you are David with a different e-mail -> welch at boltblue.com

________________________________

From: ros-kernel-bounces at reactos.com on behalf of welch at boltblue.com
Sent: Mon 3/8/2004 12:40 PM
To: ReactOS Kernel List
Subject: RE: [ros-kernel] Re: [ros-cvs] CVS Update: reactos- Supportof Matroxdisplay card



Quoting Waldo Alvarez Cañizares <wac at lab.matcom.uh.cu>:
> 
> Is the value in eax preserved? I think it is showing the value in cr2
> instead of the value that should print for eax. With that exception.
> 
> The page fault was not a problem in ROS was a mistake I did writing some
> code. While I was trying to find out what I was doing wrong I needed to
> know the value in eax at the time of the fault but noticed that it was
> the same as cr2 (was a value that was quite improvable to get in eax for
> the code I was analyzing) And when I saw your report I noticed values in
> eax and cr2 are the same too. So maybe this is a little bug in ROS but
> very annoying.
> 

Eax is saved in KiTrapProlog so saving of cr2 shouldn't affect it.

In ke\i386\trap.s if I can remember well :)

Are you sure the program wasn't doing a memory access using eax as an offset?

yes it was:

cmp 0x0, (%eax)

That is what it should print? The same value of cr2?
If it is, how do I get the value of that address stored in eax?

Thaks in advance
Waldo Alvarez


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