On Wed, Nov 27, 2002 at 09:00:53AM +0100, David Mosberger wrote:
> >>>>> On Wed, 27 Nov 2002 18:42:28 +1100, Stephen Rothwell <sfr@canb.auug.org.au> said:
>
> Stephen> I make the follwing assumptions: returning s32 from a 32
> Stephen> bit compatibility system call is the same as returning long
> Stephen> or int.
>
> That is not a safe assumption. The ia64 ABI requires that a 32-bit
> result is returned in the least-significant 32 bits only---the upper
> 32 bits may contain garbage. It should be safe to declare the syscall
> return type always as "long", no?
But the 32bit user space surely doesn't care about any garbage in
the upper 32bits, no ?
64bit user space might, but that's not driven by a shared compat layer.
-Andi
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