Re: [PATCH 2/3] Kprobes: Define retval helper
From: Ananth N Mavinakayanahalli
Date: Wed Aug 09 2006 - 11:16:57 EST
On Wed, Aug 09, 2006 at 02:16:04PM +0100, David Howells wrote:
> Christoph Hellwig <hch@xxxxxxxxxxxxx> wrote:
> > > > Good idea. You should add parentheses around regs, otherwise the C
> > > > preprocessor might bite users. Also the shouting name is quite ugly.
> > > > In fact it should probably go to asm/system.h or similar and not have
> > > > a kprobes name - it just extracts the return value from a struct pt_regs
> > > > after all.
> > >
> > > Done! How does this look? I added it to asm/ptrace.h so it lives along
> > > with the instruction_pointer() definition.
> I presume we don't care about return values that span multiple registers - for
> instance if you return a 64-bit value on i386 it'll wind up in EDX:EAX.
Yes. This helper is mostly to address the common case, not the 64-bit
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