linux-kernel - Re: RFD: x32 ABI system call numbers

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Message-ID: <CAMuHMdUJVRNPcBW60UZ+cwV75T9+xmONzTrCuDCe_dDUzg2kKg@mail.gmail.com>
Date:	Tue, 30 Aug 2011 09:06:31 +0200
From:	Geert Uytterhoeven <geert@...ux-m68k.org>
To:	"H. Peter Anvin" <hpa@...or.com>
Cc:	Kyle Moffett <kyle@...fetthome.net>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	LKML <linux-kernel@...r.kernel.org>,
	"H.J. Lu" <hjl.tools@...il.com>, Ingo Molnar <mingo@...e.hu>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: RFD: x32 ABI system call numbers

On Tue, Aug 30, 2011 at 06:45, H. Peter Anvin <hpa@...or.com> wrote:
> On 08/29/2011 07:16 PM, Kyle Moffett wrote:
>> The goal of x32 as I understand it is to allow 32-bit x86 programs to
>> use all the nifty extra registers and faster instructions (IE: syscall)
>> without needing to deal with the 2x memory overhead of 64-bit
>> pointers.

Good. IIRC, the PPC people were thinking about something similar back in 2007,
but it hasn't materialized yet.

> That is the major goal.  A minor goal is to bring x86-64 goodness to
> those who have an (irrational) fear of 64 bits thinking it is a major
> porting effort.  Thus, *source-level* porting effort matters, but it is
> completely subordinate to the major goal.

>From my experience, if the source code is not 64-bit clean, it will probably
be a major hassle to make it cope with changed time_t and off_t and other traps
of that kind...

As a first step, gcc should start enabling -Wall by default ;-)
And add a -Wcast option, as grepping for (C-style) casts is way too difficult...

Gr{oetje,eeting}s,

                        Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds
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