On 2/2/07, David Daney <ddaney@xxxxxxxxxx> wrote:
Franck Bui-Huu wrote:
> David Daney wrote:
>> The entire user context (i.e. the value of *all* registers) is replaced
>> with the values stored in the sigcontext structure on the caller's
>> stack. If all registers are being restored from the sigcontext, then
>> there is no need to save the current values of the registers, because
>> they will never be used.
>>
>
Again, why do you think that all values of the registers are saved on
sys_sigreturn() ?
> And now I'm starting to think that we don't need to save static regs in
> setup_sigcontext() either...
>
All registers *must* be saved in the sigcontext. That is part of the
contract the kernel has with user code.
I'm just talking about _static_ registers which are s0-s7...
On return from an asynchronous signal, *all* registers must contain the
same values they had before the process was interrupted.
yes I agree and I've never said the contrary.
--
Franck
