On Wed, Nov 27, 2002 at 09:29:18AM +0100, Andi Kleen wrote:
> > 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 ?
It does. With very few exceptions all 32-bit instructions on MIPS require
that all the register values are properly sign extended to 64-bit or the
operation of those instructions is undefined.
Ralf
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This archive was generated by hypermail 2b29 : Sat Nov 30 2002 - 22:00:24 EST