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

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Date:	Sun, 04 Sep 2011 21:06:48 +0200
From:	Arnd Bergmann <arnd@...db.de>
To:	"H.J. Lu" <hjl.tools@...il.com>
Cc:	"H. Peter Anvin" <hpa@...or.com>, Valdis.Kletnieks@...edu,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Christoph Hellwig <hch@...radead.org>,
	LKML <linux-kernel@...r.kernel.org>, Ingo Molnar <mingo@...e.hu>,
	Thomas Gleixner <tglx@...utronix.de>,
	Richard Kuo <rkuo@...eaurora.org>,
	Mark Salter <msalter@...hat.com>,
	Jonas Bonn <jonas@...thpole.se>,
	Tobias Klauser <tklauser@...tanz.ch>
Subject: Re: RFD: x32 ABI system call numbers

On Sunday 04 September 2011 11:40:39 H.J. Lu wrote:
> #define __NR_x32_rt_sigaction
> #define __NR_x32_rt_sigprocmask
> #define __NR_x32_rt_sigreturn
> #define __NR_x32_rt_sigpending
> #define __NR_x32_rt_sigtimedwait
> #define __NR_x32_rt_sigqueueinfo
> #define __NR_x32_rt_tgsigqueueinfo
> #define __NR_x32_sigaltstack
> #define __NR_x32_waitid
> #define __NR_x32_mq_notify
> #define __NR_x32_timer_create

Right, all signal functions certainly need a new implementation.

> #define __NR_x32_ioctl

What do you plan to do for ioctl? Does this mean you want to
have a third file_operations pointer besides ioctl and compat_ioctl?
I would hope that you manage this by using different ioctl command
numbers in the few cases where the x32 version has to differ from
the x86-32 data structure.

> #define __NR_x32_readv
> #define __NR_x32_writev
> #define __NR_x32_preadv
> #define __NR_x32_pwritev
> #define __NR_x32_vmsplice
> #define __NR_x32_move_pages
> #define __NR_x32_execve
> #define __NR_x32_set_robust_list
> #define __NR_x32_get_robust_list
> #define __NR_x32__sysctl
> #define __NR_x32_kexec_load
> #define __NR_x32_times

I guess you could define the x32 iovec etc. to be compatible with the
64 bit one, but that's not a major thing. Why can't you use the
regular x86_32 calls here?

> #define __NR_x32_recvfrom
> #define __NR_x32_sendmsg
> #define __NR_x32_recvmsg
> #define __NR_x32_recvmmsg
> #define __NR_x32_sendmmsg

These today use the MSG_CMSG_COMPAT flag to distinguish native and compat
calls. Do you plan to have another flag here to handle cmsg time values?

What about things like mq_{get,set}attr, quotactl and semtimedop?

	Arnd
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