Re: [PATCH 2/3] Kprobes: Define retval helper

From: David Howells
Date: Wed Aug 09 2006 - 09:16:01 EST

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.

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