linux-kernel - Re: [RFC PATCH v2 2/6] uprobes/x86: Emulate unconditional rip-relative jmp's

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Message-ID: <534690A4.8010003@redhat.com>
Date:	Thu, 10 Apr 2014 14:37:56 +0200
From:	Denys Vlasenko <dvlasenk@...hat.com>
To:	Oleg Nesterov <oleg@...hat.com>, Ingo Molnar <mingo@...e.hu>,
	Srikar Dronamraju <srikar@...ux.vnet.ibm.com>
CC:	Ananth N Mavinakayanahalli <ananth@...ibm.com>,
	Anton Arapov <aarapov@...hat.com>,
	David Long <dave.long@...aro.org>,
	"Frank Ch. Eigler" <fche@...hat.com>,
	Jim Keniston <jkenisto@...ibm.com>,
	Jonathan Lebon <jlebon@...hat.com>,
	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [RFC PATCH v2 2/6] uprobes/x86: Emulate unconditional rip-relative
 jmp's

On 04/09/2014 09:44 PM, Oleg Nesterov wrote:
> uprobes/x86: Emulate unconditional rip-relative jmp's

I propose "Emulate unconditional relative jmp's"


> +	union {
>  #ifdef CONFIG_X86_64
> -	unsigned long			rip_rela_target_address;
> +		unsigned long			rip_rela_target_address;
>  #endif
> +		struct {
> +			s32	disp;

In x86-speak, jumps and calls have "offsets", not "displacements"

> +			u8	ilen;
> +		}				ttt;
> +	};
>  };

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