linux-kernel - Re: Re: Re: [RFC PATCH 4/6] uprobes/x86: Emulate rip-relative call's

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Message-ID: <CAK1hOcOOfr=DyLd-gZccZzvCuxGJiehi6NTe88QMQd0qRg2TJw@mail.gmail.com>
Date:	Fri, 18 Apr 2014 17:17:40 +0200
From:	Denys Vlasenko <vda.linux@...glemail.com>
To:	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>
Cc:	Denys Vlasenko <dvlasenk@...hat.com>,
	Oleg Nesterov <oleg@...hat.com>,
	Jim Keniston <jkenisto@...ux.vnet.ibm.com>,
	Ingo Molnar <mingo@...e.hu>,
	Srikar Dronamraju <srikar@...ux.vnet.ibm.com>,
	Ananth N Mavinakayanahalli <ananth@...ibm.com>,
	Anton Arapov <aarapov@...hat.com>,
	David Long <dave.long@...aro.org>,
	"Frank Ch. Eigler" <fche@...hat.com>,
	Jonathan Lebon <jlebon@...hat.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: Re: Re: [RFC PATCH 4/6] uprobes/x86: Emulate rip-relative call's

On Mon, Apr 14, 2014 at 4:22 PM, Masami Hiramatsu
<masami.hiramatsu.pt@...achi.com> wrote:
> (2014/04/11 21:23), Denys Vlasenko wrote:
>> On Fri, Apr 11, 2014 at 5:03 AM, Masami Hiramatsu
>> <masami.hiramatsu.pt@...achi.com> wrote:
>>> At least, if we can trust Intel SDM, it says that depends
>>> on the operand-size (insn->opnd_bytes) and stack segment
>>> descriptor. Please check the SDM vol.1 6.2.2 Stack Alignment
>>> and vol.2a, 3.2 Instructions (A-M), CALL--Call Procedure.
>>> But we'd better check it on x86-32.
>>
>> I am past trusting CPU manuals on this one:
>>
>> By now I verified on the real hardware that AMD and Intel CPUs
>> handle this insn differently in 64-bit mode: Intel ignores 0x66 prefix.
>> AMD treats this insn the same as in 32-bit mode: as 16-bit insn.
>>
>> (Should I submit a patch adding comment about it
>> in x86-opcode-map.txt?)
>
> Yeah, feel free to do so :)

I sent a patch (in another email), please apply.
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