linux-kernel - RE: [RFC PATCH net-next 2/6] x86: bpf_jit_comp: support BPF_S_ANC_SECCOMP_LD

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Date:	Fri, 26 Apr 2013 08:46:22 -0700
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	David Laight <David.Laight@...LAB.COM>
Cc:	Xi Wang <xi.wang@...il.com>, Daniel Borkmann <dborkman@...hat.com>,
	"David S. Miller" <davem@...emloft.net>,
	Russell King <linux@....linux.org.uk>,
	Heiko Carstens <heiko.carstens@...ibm.com>,
	Eric Dumazet <edumazet@...gle.com>,
	Will Drewry <wad@...omium.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: RE: [RFC PATCH net-next 2/6] x86: bpf_jit_comp: support
 BPF_S_ANC_SECCOMP_LD_W instruction

On Fri, 2013-04-26 at 16:38 +0100, David Laight wrote:

> The call needs the displacement from the address of
> the instruction following the call.
> I can't imagine any way in which above can allow for the 5 byte
> 'mov imm32,%edi' instruction.
> 
> I'd have thought there would be an EMIT1_imm32().
> (I've written a lot of x86 asm in my days!)
> 

Thats the same. 

off32 is a 32bit quantity, or immediate 32 if you prefer.



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