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Re: [RFC PATCH gnumach 03/34] Make exception subcode a long

From: Sergey Bugaev
Subject: Re: [RFC PATCH gnumach 03/34] Make exception subcode a long
Date: Mon, 3 Apr 2023 12:32:08 +0300

On Mon, Apr 3, 2023 at 1:45 AM Samuel Thibault <samuel.thibault@gnu.org> wrote:
> Sergey Bugaev, le dim. 19 mars 2023 18:09:46 +0300, a ecrit:
> > On EXC_BAD_ACCESS, exception subcode is used to pass the faulting memory
> > address, so it needs to be (at least) pointer-sized. Thus, make it into
> > a long.
> >
> > This requires matching changes in glibc and the Hurd.
> But the change doesn't affect 32bit glibc and hurd since
> rpc_long_integer_t is really like integer_t there, right?

It's supposed to be ABI-compatible on 32-bit, since all these types
are 32-bit integers there, yes. (But maybe I messed up, do check!)

But it may break source-level compatibility (if you only apply the
Mach change but not glibc, or vice versa); as in maybe GCC will
complain about int vs long in function prototype vs definition. I
haven't actually checked, since I have both changes applied locally.


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