Re: Use of the PC value in interrupt/exception handlers

To: Piyus Kedia <piyuskedia%gmail.com@localhost>
Subject: Re: Use of the PC value in interrupt/exception handlers
From: Matt Thomas <matt%3am-software.com@localhost>
Date: Fri, 2 Aug 2013 09:44:55 -0700

On Aug 2, 2013, at 9:41 AM, Piyus Kedia <piyuskedia%gmail.com@localhost> wrote:

> Hi,
> 
> I can see a system call sys_rasctl which install a RAS area. So I assume that 
> the RAS PC's will be only user PC's and the cpu_switchto will modify the user 
> PC if it is interrupted in the middle of a RAS.

No. Some architectures use RAS against kernel addresses 
but those comparisons against the PC are explicitly done.
(MIPS is an example for implementing the atomic_ops on
MIPS processors which don't have the LL/SC instructions.)

Follow-Ups:
- Re: Use of the PC value in interrupt/exception handlers
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References:
- Use of the PC value in interrupt/exception handlers
  - From: Piyus Kedia
- Re: Use of the PC value in interrupt/exception handlers
  - From: Martin Husemann
- Re: Use of the PC value in interrupt/exception handlers
  - From: Matt Thomas
- Re: Use of the PC value in interrupt/exception handlers
  - From: Piyus Kedia

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