[parisc-linux] compiling kernels with gcc-3.1

[John David Anglin]

> the problem is that the PA ABI specifies that quantities shall be
> `naturally' aligned, even 64-bit quantities on 32-bit machines.  so the
> kernel is expecting to see:
> 
> 	fd (32 bits)
> 	buf (32 bits)
> 	count (32 bits)
> 	(empty)
> 	pos (64 bits)
> 
> what it _actually_ gets (because glibc is hideously broken, IMO):
> 
> 	fd
> 	buf
> 	count
> 	(pos >> 32)
> 	pos & 0xffffffff

It's probably a whole lot easier to fix glibc than change gcc.

> is there any chance of having a flag (or maybe an __attribute__ that
> we could #define asmlinkage to?) which would change the ABI to be more
> compressed like all the other architectures?

I think this is basically a bad idea as it will have a whole lot
of nasty side effects.  How will gdb know which ABI, varargs, etc?

You would need to use a compiler switch and modify
FUNCTION_ARG_PARTIAL_NREGS and FUNCTION_ARG appropriately.

Dave
-- 
J. David Anglin                                  dave.anglin@nrc.ca
National Research Council of Canada              (613) 990-0752 (FAX: 952-6605)