Copy stable/9 to releng/9.3 as part of the 9.3-RELEASE cycle.

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

Copy head to stable/9 as part of 9.0-RELEASE release cycle.

Approved by: re (implicit)

For un-prototyped static inline functions declared in pthread_md.h on
ia64, powerpc, and sparc64, use ANSI function headers and specifically
indicate the lack of arguments with 'void'. Otherwise, warnings are
generated at WARNS=3, leading to a compile failure with -Werror.

WARNS=3'ify.

Repo copy libpthreads to libkse.
This introduces the WITHOUT_LIBKSE nob,
and changes WITHOUT_LIBPTHREADS to mean with neither threading libs.
Approved by: re(kensmith)

The ucontext is 16-byte aligned, which means that struct tcb is
16-byte aligned. Consequently, struct tcb is a multiple of 16
bytes in size. We need to make sure there's no padding after
struct ppc32_tp. We do this by explicitly adding the necessary
padding in front of it.

Stylize. Introduce ppc_{get|set}_tp() and ppc_{get|set}_tcb() to
abstract the magic that happens when deriving one or the other.

Implement TLS.

Bring PPC up to date with latest TLS changes.

1. Add macro DTV_OFFSET to calculate dtv offset in tcb.
2. Export symbols needed by debugger.

PPC MD bits for KSE. Runs test cases OK. Crippled to 1:1 mode for
the time being.