On 11/23/09 09:23, Bastian Blank wrote:
>> I don't believe that is the case (the processor would have to carry some
>> state for the entire duration of a syscall for it to make any
>> difference). I think the spec simply assumes that an OS author would
>> want to use sysret if they used syscall.
>>
> Well, it is documented this way. If you ignore it, it can work (and does
> in this case) but is undefined behaviour.
>
Linux freely uses iret to return from syscall for things like fork and
exec. They are complimentary instructions, but nothing requires them to
be paired.
J
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