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Date: Mon, 14 Nov 2011 17:39:53 +0100
From: Oleg Nesterov <oleg@redhat.com>
To: Srikar Dronamraju <srikar@linux.vnet.ibm.com>
Cc: Peter Zijlstra <peterz@infradead.org>,
        Linus Torvalds <torvalds@linux-foundation.org>,
        Andrew Morton <akpm@linux-foundation.org>,
        LKML <linux-kernel@vger.kernel.org>, Linux-mm <linux-mm@kvack.org>,
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        Steven Rostedt <rostedt@goodmis.org>,
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        Thomas Gleixner <tglx@linutronix.de>,
        Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>,
        Arnaldo Carvalho de Melo <acme@infradead.org>,
        Anton Arapov <anton@redhat.com>,
        Ananth N Mavinakayanahalli <ananth@in.ibm.com>,
        Jim Keniston <jkenisto@linux.vnet.ibm.com>,
        Stephen Wilson <wilsons@start.ca>
Subject: Re: [PATCH v6 3.2-rc1 28/28]   uprobes: introduce
	UTASK_SSTEP_TRAPPED logic
Message-ID: <20111114163953.GA29399@redhat.com>
References: <20111110183725.11361.57827.sendpatchset@srdronam.in.ibm.com> <20111110184307.11361.8163.sendpatchset@srdronam.in.ibm.com>
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On 11/11, Srikar Dronamraju wrote:
>
> +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?

Oleg.