linux-kernel - Re: [patch] x86: ptrace and core-dump extensions for xstate

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Date:	Thu, 04 Feb 2010 14:18:09 -0800
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Suresh Siddha <suresh.b.siddha@...el.com>
CC:	Roland McGrath <roland@...hat.com>,
	Oleg Nesterov <oleg@...hat.com>, Ingo Molnar <mingo@...e.hu>,
	Thomas Gleixner <tglx@...utronix.de>,
	LKML <linux-kernel@...r.kernel.org>,
	"Lu, Hongjiu" <hongjiu.lu@...el.com>,
	"Lachner, Peter" <peter.lachner@...el.com>
Subject: Re: [patch] x86: ptrace and core-dump extensions for xstate

On 02/04/2010 02:05 PM, Suresh Siddha wrote:
> 
> So in the example you provided before:
> 
>         struct iovec iov = { mybuffer, mylength };
>         ret = ptrace(PTRACE_GETREGSET, NT_X86_XSTATE, &iov);
> 
> You wanted to propose common data format (iov) for all of the NT_* ?
> 

How about encoding the regset number into the command, e.g.
ptrace(PTRACE_GETREGS(NT_X86_XSTATE), length, buffer)

... where we have ...

#define PTRACE_GETREGS(r) (((r) << 16) | PTRACE_GETREGS_CMD)

... or something like that?

	-hpa

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