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Message-ID: <1328217833.5776.7.camel@pasglop>
Subject: Re: [PATCH] Implement GET_IP/SET_IP for powerpc architecture.
From: Benjamin Herrenschmidt <benh@au1.ibm.com>
To: Mike Frysinger <vapier@gentoo.org>
Date: Fri, 03 Feb 2012 08:23:53 +1100
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References: <20120202144125.GA6221@linux.vnet.ibm.com>
 <201202021128.49188.vapier@gentoo.org>
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Cc: linuxppc-dev <linuxppc-dev@ozlabs.org>,
 Srikar Dronamraju <srikar@linux.vnet.ibm.com>
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On Thu, 2012-02-02 at 11:28 -0500, Mike Frysinger wrote:
> On Thursday 02 February 2012 09:41:25 Srikar Dronamraju wrote:
> > +#define GET_FP(regs)		(0)
> > +#define SET_FP(regs, val)
> 
> ppc doesn't have a standard FP location ?

Not really no, it's the sp (r1). r31 might be considered a "frame
pointer" under some circumstances but there isn't much you can do with
it, it's really r1 that gives you the ability to backtrace (each stack
frame contains a pointer to the next one).

> > +#define profile_pc(regs) GET_IP(regs)
> 
> pretty sure you don't need this as asm-generic/ptrace.h already has a 
> definition for you
> -mike

Cheers,
Ben.