Re: long long on 32-bit machines

[Arnd Bergmann]

On Thursday 29 January 2004 02:34, H. Peter Anvin wrote:

> If I remember correctly, a 6-argument system call on s390 will put a
> pointer to the last two arguments as the effective 5th argument, so this
> would not affect the system call calling convention, correct?

Almost. I think this is only relevant for mmap2(), where we pass a single
pointer to a struct with all six arguments, but the result is the same.

I don't know where I got the misinformation about the register pairs
on s390, but I verified that the problem exists on MIPS and PowerPC.
See sys32_ftruncate64 in arch/mips/kernel/linux32.c and 
arch/ppc64/kernel/sys_ppc32.c. PA-RISC appearantly work around this
by defining their own system call handlers with separate high/low
arguments, so they effectively work like i386 and s390. 

	Arnd <><

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