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

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Message-ID: <8EA2C2C4116BF44AB370468FBF85A7770123B84115@orsmsx504.amr.corp.intel.com>
Date:	Fri, 5 Feb 2010 11:47:25 -0800
From:	"Lu, Hongjiu" <hongjiu.lu@...el.com>
To:	"H. Peter Anvin" <hpa@...or.com>,
	"Siddha, Suresh B" <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>,
	"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?
> 

I like this idea.

BTW, it should be

ptrace(PTRACE_GETREGS(NT_X86_XSTATE), pid, length, buffer)


H.J.
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