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Re: [PATCH 0/2] nptl: Update struct pthread_unwind_buf
On Sun, Feb 25, 2018 at 5:36 AM, H.J. Lu <firstname.lastname@example.org> wrote:
> On Sun, Feb 25, 2018 at 5:31 AM, Florian Weimer <email@example.com> wrote:
>> * H. J. Lu:
>>> libpthread cancellation implementation passes cancel_jmp_buf to
>>> libgcc unwinder,
>> Oh. Where does it do that? If you mean _Unwind_ForcedUnwind, I think
>> that's just an opaque closure argument for the callback.
> Yes. Libgcc unwinder needs to deal with it.
Because of libgcc unwinder, provide another set of setjmp/longjmp
without saving and restoring shadow stack register for thread cancellation
won't solve our problem.