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[PATCH 0/6] Support kernel-backed user threads on FreeBSD

This set of patches adds support for examining kernel-backed user threads on
FreeBSD.  There is more history in a comment in fbsd-nat.c, but this target
uses ptrace directly (instead of libthread_db) to support the current
threading library (libthr) on FreeBSD which uses a kernel thread for each
user thread.  Support for thread names in both core dumps (via FreeBSD's
OS-specific NT_THRMISC core note) and live is supported as is scheduler
locking.  gcore generates register notes for each thread as well.

The first two patches are to binutils to support FreeBSD-specific core
notes.  The last four are to GDB.

John Baldwin (6):
  Add support to readelf for reading FreeBSD ELF core notes.
  Add a psuedosection for the NT_FREEBSD_THRMISC note.
  Display per-thread information for threads in FreeBSD cores.
  Use LWP IDs with ptrace register requests on FreeBSD.
  Add support for LWP-based threads on FreeBSD.
  Dump register notes for each thread when generating a FreeBSD core.

 bfd/ChangeLog         |   4 +
 bfd/elf.c             |   7 +
 binutils/ChangeLog    |   5 +
 binutils/readelf.c    |  35 ++++
 gdb/ChangeLog         |  68 ++++++++
 gdb/amd64bsd-nat.c    |  35 ++--
 gdb/         |   3 +
 gdb/configure         |  16 ++
 gdb/      |   7 +
 gdb/fbsd-nat.c        | 452 +++++++++++++++++++++++++++++++++++++++++++++++---
 gdb/fbsd-tdep.c       | 185 ++++++++++++++++++---
 gdb/i386bsd-nat.c     |  41 +++--
 gdb/ppcfbsd-nat.c     |  23 ++-
 include/elf/ChangeLog |  27 +++
 include/elf/common.h  |  14 ++
 15 files changed, 842 insertions(+), 80 deletions(-)
 create mode 100644 include/elf/ChangeLog


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