Copy stable/10@r272459 to releng/10.1 as part of
the 10.1-RELEASE process.

Approved by: re (implicit)
Sponsored by: The FreeBSD Foundation

Copy head (r256279) to stable/10 as part of the 10.0-RELEASE cycle.

Approved by: re (implicit)
Sponsored by: The FreeBSD Foundation

Apply local modifications to make Unwind Express BETA 10 buildable and
usable in the FreeBSD kernel.

This commit was generated by cvs2svn to compensate for changes in r160157,
which included commits to RCS files with non-trunk default branches.

Import BETA 10 of HP's Unwind Express. This import does not contain
any modifications to make it build as part of the FreeBSD kernel.
Now that the source appears to have stabilized, local changes will
happen on HEAD and will therefore cause affected files to be pulled
from the vendor branch.

Update to BETA 7. Besides C++ support, which is irrelevant to us,
this version mostly has bugs fixes.

Import beta6 of libuwx. This release has some minor fixes and
some minor corrections to beta5.

Upgrade Unwind Express (libuwx) to BETA 5. This upgrade includes
all the fixes locally applied and submitted to the author. Not
included in BETA 5, but part of this import are:
o FreeBSD specific ifdefs to make this compile within a kernel.
These are limited to include directives and defines.
o Removal of unused variables, proper casts and initializations
to allow building with -Werror. This happens in code so has a
higher chance of causing future import conflicts but not enough
to worry about it.

I'm especially thankful that the author accepted the change to
replace DISABLE_TRACE with UWX_TRACE_ENABLE so that we can use it
in kernel config files without nasty mappings or indirections as
that would make the integration less perfect. Thanks Cary!

This is beta4 of libuwx; an ia64 stack unwinder. This code is made
available by Hewlett-Packard under the MIT license. The unwinder is
small, clean and fast and needed little adaptation for use in the
kernel.

This import has embedded in it the changes needed to make it build
in a kernel environment.

To optimize the common case, the kernel will minimize the number
of registers saved by not saving the preserved registers. In case
access to preserved registers is needed (signal handling, ptrace)
the kernel will unwind to the context of the syscall or exception.
For this we need an unwinder.

Approved by: re (blanket)