On Tue, Dec 29, 2015 at 4:24 AM, Stas Sergeev <s...@list.ru> wrote: > 08.12.2015 02:23, Andy Lutomirski пишет: >> On Oct 31, 2015 8:25 AM, "Stas Sergeev" <s...@list.ru> wrote: >>> >>> 26.10.2015 04:25, Andy Lutomirski пишет: >>> >>>> These fields have a strange history. This tries to document it. >>>> >>>> This borrows from 9a036b93a344 ("x86/signal/64: Remove 'fs' and 'gs' >>>> from sigcontext"), which was reverted by ed596cde9425 ("Revert x86 >>>> sigcontext cleanups"). >>>> >>>> Signed-off-by: Andy Lutomirski <l...@kernel.org> >>> >>> Now the strategy about SS is to always save it to the sigcontext. >>> This is good because the syscall can clobber it, so the app had >>> to be very careful in the past trying to save it by hands. >>> How about saving also fs and gs? (without restoring yet) >>> If you do, you'll save dosemu a headache of doing any "pre-syscall" >>> work. Pre-syscall work is very nasty. >>> I haven't checked if the syscall clobber also these or only SS, >>> but perhaps saving them by the kernel won't hurt? >> >> There's a bunch of ongoing work about FS and GS. I want to wait and see. > Andy, have you postponed only this, or also the sigreturn patch? > Long time no news... > sigreturn patch would really be nice to have.
Sorry, I got caught up with a bunch of other stuff, and everyone being slow with the holiday season. There's some slight chance we'll get it in for 4.5, but 4.6 is more likely. --Andy -- Andy Lutomirski AMA Capital Management, LLC -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/