Subject: Re: old PC from interrupt handler?
To: None <magnus@MIT.EDU>
From: Allen Briggs <>
List: macbsd-development
Date: 04/13/1995 20:54:57
> Suppose I have an interrupt- how can I tell from inside the interrupt
> handler code what the PC was immediately before the interrupt
> occurred?

An argument to the interrupt handler is a frame pointer.  The PC is
stored in there.

> (I want to set a VIA timer to see where the PC is inside the ROM
> routines at specific times.  Will this work?)

Might--I dunno...  Keep in mind that actually printing stuff out will
affect your timing...  ;-)


Allen Briggs - end killing - ** MacBSD == NetBSD/mac68k **