linux-kernel - Re: Avoiding unnecessary jump relocations in gas?

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Message-ID: <CAMe9rOrSP=XW29ae3fkHrFUdjhfvGbB5b5U=EA74wofNC4qEBA@mail.gmail.com>
Date:	Mon, 18 May 2015 13:25:02 -0700
From:	"H.J. Lu" <hjl.tools@...il.com>
To:	"H. Peter Anvin" <hpa@...or.com>
Cc:	Andy Lutomirski <luto@...capital.net>,
	Borislav Petkov <bp@...en8.de>,
	Jan Beulich <JBeulich@...e.com>,
	Binutils <binutils@...rceware.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: Avoiding unnecessary jump relocations in gas?

On Mon, May 18, 2015 at 1:06 PM, H. Peter Anvin <hpa@...or.com> wrote:
> On 05/18/2015 01:02 PM, H.J. Lu wrote:
>>>
>>> I wonder if it would make sense to have explicit mnemonics for the
>>> one-byte offset and four-byte offset jump variants.  Sometimes users
>>> want a jump with a 32-bit offset for reasons that have nothing to do
>>> with link-time or load-time relocations.
>>>
>>
>> There is:
>>
>> jmp.d32 foo
>>
>
> How far back does that syntax work?
>

.d32 support was added by

commit f8a5c266971d7b5b96f973805551c6e88669cada
Author: H.J. Lu <hjl.tools@...il.com>
Date:   Thu Oct 14 13:31:13 2010 +0000

    Add .d32 encoding suffix.

and .d8 supported was added by

commit a501d77eeba717f6d54dce44f286f9e3aad83144
Author: H.J. Lu <hjl.tools@...il.com>
Date:   Fri Jan 20 20:53:50 2012 +0000

    Add .d8 suffix support to x86 assembler

I don't believe .d16 is supported.

-- 
H.J.
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