Messages in this thread | | | Date | Sun, 7 Jan 2007 08:18:17 -0700 | From | Matthew Wilcox <> | Subject | Re: [PATCH] Common compat_sys_sysinfo |
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On Sun, Jan 07, 2007 at 03:13:19PM +0000, Christoph Hellwig wrote: > and last but not least we probably want a unified mechanisms to deal > with the 64bit arguments that are broken up into two 32bit ones (not just > for emulation but also for 32it BE architectures)
It's not BE that is the problem -- drepper thought of that.
What he fundamentally missed was the calling convention where 64-bit arguments have to be 64-bit aligned, even when they're passed through registers. So:
int foo(int, long long);
takes its arguments in arg0, arg2 and arg3, but glibc passes the syscall arguments in arg0, arg1 and arg2.
I think the Right Way to fix this is for some gcc hacker to implement an __attribute__((packed_args)) that changes the calling convention for that function, then we can define asmlinkage to use that on mips and parisc.
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