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Re: [RFC PATCH 00/34] The rest of the x86_64-gnu port
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From: |
Sergey Bugaev |
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Subject: |
Re: [RFC PATCH 00/34] The rest of the x86_64-gnu port |
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Date: |
Tue, 11 Apr 2023 00:24:55 +0300 |
On Mon, Apr 10, 2023 at 10:20 PM Samuel Thibault
<samuel.thibault@gnu.org> wrote:
>
> Sergey Bugaev, le dim. 19 mars 2023 18:09:43 +0300, a ecrit:
> > As for sigreturn specifically: I'm concerned about the possibility that
> > putting the register dump onto the user's stack (or at %rsp - 128, on
> > x86_64)
> > may clobber the data trampoline.c puts there (unless an altstack is used),
> > including the very sigcontext.
>
> I guess we could make sure that the offset of ctx in stackframe is not
> hit by data written by sigreturn.c.
Right; it would be easiest to reserve enough space for the register
dump at the end of 'struct stackframe', i.e. right after the user's
stack.
Sergey