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[PATCH v2 0/5] Extended-remote exec events


This is an update to the extended-remote exec event patchset.  The
differences from the previous version include:

1) support for the multi-arch case (e.g. 64-bit executable execs a
   32-bit executable).  This is mainly accomplished by re-initializing
   the target architecture on both the remote and client sides after
   an exec event.

2) fixing the exec event message to use a process-style ptid to match
   the message for the native case (same as was done for fork events).

3) fixing intermittent failure introduced in gdb.base/pie-execl.exp in
   the previous version.

Original description is mostly unchanged below.
Thanks
--Don

--------------

This patch series implements exec events for extended-remote Linux targets.
It provides exec event notification, follow-exec functionality, and exec
catchpoints.  Several tests related to exec event features have been
modified to work with the native-extended-gdbserver target.

It is part of the larger effort to implement "remote follow fork".  This
work has been divided into three parts:

1) Extended-remote fork events, providing follow-fork-mode,
detach-on-fork, and fork catchpoints.  This was pushed earlier this
year: https://sourceware.org/ml/gdb-patches/2015-05/msg00278.html

2) Extended-remote exec events, this patchset.

3) Fork and exec events for native-gdbserver target.

This patchset derives from part of a patch series submitted last October:

https://sourceware.org/ml/gdb-patches/2014-10/msg00868.html

The primary difference between this patchset and that one is that this
one does not use ptrace exit events (PTRACE_O_TRACEEXIT) for notification
of thread exit.  In addition, a number of changes were made to conform to
to the final version of the extended-remote fork event patchset (#1 above).

Tested on x86_64 GNU/Linux with native, native-gdbserver, and 
native-extended-gdbserver targets.

The contents of this patchset are as follows:

Patch 1/5: Extended-remote exec event support.

Patch 2/5: Extended-remote exec catchpoints.

Patch 3/5: Extended-remote exec-related test updates.

Patch 4/5: Eliminates some spurious warnings related to the solib
	   event hook that are emitted after an extended-remote exec
	   event.

Patch 5/5: Extended-remote exec event documentation.


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