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Re: Remove __ASSUME_TRUNCATE64_SYSCALL

From: David Miller <davem at davemloft dot net>
To: roland at hack dot frob dot com
Cc: joseph at codesourcery dot com, libc-alpha at sourceware dot org, ryan dot arnold at gmail dot com
Date: Tue, 29 May 2012 20:08:35 -0400 (EDT)
Subject: Re: Remove __ASSUME_TRUNCATE64_SYSCALL
References: <Pine.LNX.4.64.1205262031270.16948@digraph.polyomino.org.uk><20120530000033.125DF2C0B8@topped-with-meat.com>

From: Roland McGrath <roland@hack.frob.com>
Date: Tue, 29 May 2012 17:00:33 -0700 (PDT)

> I don't know how the various 32-bit ABIs handle 64-bit arguments.
> It is worth looking into if any/several/all of them (aside from
> powerpc32) can use syscalls.list for these calls.

They pass them in using two 32-bit argument registers, the order of
matches whatever the C calling convention specifies for passing 64-bit
values.

References:
- Remove __ASSUME_TRUNCATE64_SYSCALL
  - From: Joseph S. Myers
- Re: Remove __ASSUME_TRUNCATE64_SYSCALL
  - From: Roland McGrath

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