linux-kernel - Re: [PATCH v6 3.2-rc1 28/28] uprobes: introduce UTASK_SSTEP

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Date:	Tue, 15 Nov 2011 13:14:06 +0530
From:	Srikar Dronamraju <srikar@...ux.vnet.ibm.com>
To:	Oleg Nesterov <oleg@...hat.com>
Cc:	Peter Zijlstra <peterz@...radead.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Linux-mm <linux-mm@...ck.org>, Ingo Molnar <mingo@...e.hu>,
	Andi Kleen <andi@...stfloor.org>,
	Christoph Hellwig <hch@...radead.org>,
	Steven Rostedt <rostedt@...dmis.org>,
	Roland McGrath <roland@...k.frob.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>,
	Arnaldo Carvalho de Melo <acme@...radead.org>,
	Anton Arapov <anton@...hat.com>,
	Ananth N Mavinakayanahalli <ananth@...ibm.com>,
	Jim Keniston <jkenisto@...ux.vnet.ibm.com>,
	Stephen Wilson <wilsons@...rt.ca>
Subject: Re: [PATCH v6 3.2-rc1 28/28]   uprobes: introduce
 UTASK_SSTEP_TRAPPED logic

> >
> > +void __weak abort_xol(struct pt_regs *regs, struct uprobe_task *utask)
> > +{
> > +	set_instruction_pointer(regs, utask->vaddr);
> > +}
> 
> OK, this is fine on 32bit. But X86_64 should also handle
> UPROBES_FIX_RIP_AX/CX?
> 
> IOW, shouldn't we also do
> 
> 	if (uprobe->fixups & UPROBES_FIX_RIP_AX)
> 		regs->ax = tskinfo->saved_scratch_register;
> 	else if (uprobe->fixups & UPROBES_FIX_RIP_CX)
> 		regs->cx = tskinfo->saved_scratch_register;
> 
> on 64bit?

Yes, we should be doing this on x86_64. Since abort_xol is a weak
function, I will have x86_64 specific abort_xol.

-- 
Thanks and Regards
Srikar

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