On Thu, 2023-07-06 at 15:24 +0100, Mark Brown wrote: > On Thu, Jul 06, 2023 at 02:14:40PM +0100, > szabolcs.nagy@xxxxxxx wrote: > > The 07/05/2023 20:29, Mark Brown wrote: > > > > Push and pop are one control, you get both or neither. > > > gcspopm is always available (esentially *ssp++, this is used > > for longjmp). > > Ah, sorry - I misremembered there. You're right, it's only push that > we > have control over. Ah, ok! So if you are not planning to enable the push mode then the features are pretty well aligned, except: - On x86 it is possible to switch stacks without leaving a token behind. - The GCSPOPM/INCSSP looping may require longer loops on ARM because it only pops one at at time. If you are not going to use GCSPUSHM by default, then I think we *should* be able to have some unified set of rules for developers for glibc behaviors at least.
