Re: unwind support for Linux 2.6 vsyscall DSO

[Michael Snyder <msnyder@redhat.com>]

Kevin Buettner wrote:
> On Oct 9,  3:20pm, Roland McGrath wrote:
> 
> 
>>Kevin says:
>>
>>>I think that's what TARGET_CREATE_INFERIOR_HOOK is for.
>>
>>This is only called in the "run" case.  There is also
>>SOLIB_CREATE_INFERIOR_HOOK, but that is called only in the "run", "target
>>remote", and follow-exec cases AFAICT.  
>>
>>To reiterate, we need something that is called at the break-on-exec from
>>run, immediately after attach, immediately after loading a core file, and
>>after follow-exec breaks if that support is real.
> 
> 
> It may be possible that the existing mechanisms (either
> TARGET_CREATE_INFERIOR_HOOK or SOLIB_CREATE_INFERIOR_HOOK) are
> adequate, but simply not called from enough places.  If these
> must stay as they are, then we need some new hooks.  These days,
> we normally set these up as gdbarch methods.  For linux, such a
> method could be registered in the $arch-linux-tdep.c file.

History-man says, TARGET_CREATE_INFERIOR_HOOK was added in 1995,
specifically to fork-child.c, to allow somebody to get control
of the new child process just before execution of the first
instruction.  Seems like we would need a different hook for,
say, attach.