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Re: ISR parameter question

To: Andrew Lunn <andrew dot lunn at ascom dot ch>
Subject: Re: [ECOS] ISR parameter question
From: Jonathan Larmour <jlarmour at redhat dot com>
Date: Sun, 09 Sep 2001 20:11:40 +0100
Cc: Grant Edwards <grante at visi dot com>,ecos-discuss at sourceware dot cygnus dot com
References: <20010907170015.A9276@visi.com> <20010908121622.K7347@biferten.ma.tech.ascom.ch>

Andrew Lunn wrote:
> 
> Yes, its an undocumentated feature. The assembly code which calls your
> isr functions passes an extra parameter. This is the register set for
> what ever the interrupt interrupted. So regs->pc is the program
> counter when the interrupt happened.
> 
> Since this is undocumented, its not an official part of the API. It
> could change any time....but i've been using it since December 1999
> without a problem.

At the very least it's not portable - not every HAL does it.

Jifl
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References:
- ISR parameter question
  - From: Grant Edwards
- Re: ISR parameter question
  - From: Andrew Lunn

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