linux-kernel - Re: [PATCH -tip -v10 5/7] x86: add pt_regs register and stack access APIs

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Date:	Mon, 06 Jul 2009 16:34:53 +0200
From:	Andi Kleen <andi@...stfloor.org>
To:	Masami Hiramatsu <mhiramat@...hat.com>
Cc:	Ingo Molnar <mingo@...e.hu>, Steven Rostedt <rostedt@...dmis.org>,
	lkml <linux-kernel@...r.kernel.org>,
	systemtap <systemtap@...rces.redhat.com>,
	kvm <kvm@...r.kernel.org>,
	DLE <dle-develop@...ts.sourceforge.net>,
	Christoph Hellwig <hch@...radead.org>,
	Ananth N Mavinakayanahalli <ananth@...ibm.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Roland McGrath <roland@...hat.com>,
	Srikar Dronamraju <srikar@...ux.vnet.ibm.com>,
	linux-arch@...r.kernel.org
Subject: Re: [PATCH -tip -v10 5/7] x86: add pt_regs register and stack access APIs

Masami Hiramatsu <mhiramat@...hat.com> writes:

> Add following APIs for accessing registers and stack entries from pt_regs.

You forgot to state who calls these functions/why are they added?
Who only has strings for registers?

I can see the point of having a function for nth argument though,
that's useful.

> +static inline unsigned long regs_get_argument_nth(struct pt_regs *regs,
> +						  unsigned n)
> +{
> +	if (n < NR_REGPARMS) {
> +		switch (n) {
> +		case 0:
> +			return regs->ax;
> +		case 1:
> +			return regs->dx;
> +		case 2:
> +			return regs->cx;


[....]

That could be done shorter with a offsetof table.

> +	if (n < NR_REGPARMS) {
> +		switch (n) {
> +		case 0:
> +			return regs->di;
> +		case 1:
> +			return regs->si;
> +		case 2:
> +			return regs->dx;
> +		case 3:
> +			return regs->cx;
> +		case 4:
> +			return regs->r8;
> +		case 5:
> +			return regs->r9;

and that too.


-Andi
-- 
ak@...ux.intel.com -- Speaking for myself only.
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