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

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Message-ID: <8EA2C2C4116BF44AB370468FBF85A7770123AAB303@orsmsx504.amr.corp.intel.com>
Date:	Wed, 3 Feb 2010 18:22:53 -0800
From:	"Lu, Hongjiu" <hongjiu.lu@...el.com>
To:	Roland McGrath <roland@...hat.com>
CC:	"Siddha, Suresh B" <suresh.b.siddha@...el.com>,
	Oleg Nesterov <oleg@...hat.com>,
	"H. Peter Anvin" <hpa@...or.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

> > That is how processor works.
> 
> We're not talking about the processor.
> We're talking about the API of a Linux system call.
> 
> 

To support XSAVE, gdb needs to know XCR0 as well as XSTATE size.
We can get those info from kernel via system call or cpuid. I
prefer cpuid over system call.


H.J.
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