ddb: add support for DWARF line number decoding

This allows ddb's "trace" command to include file and line numbers:

  ddb{0}> trace
  Debugger() at Debugger+0x9 [../../../../arch/amd64/amd64/db_interface.c:405]
  ddb_sysctl() at ddb_sysctl+0x1b4 [../../../../ddb/db_usrreq.c:104]
  sys___sysctl() at sys___sysctl+0x216 [../../../../kern/kern_sysctl.c:229]
  syscall() at syscall+0x297 [../../../../sys/syscall_mi.h:84]
  --- syscall (number 202) ---
  end of kernel
  end trace frame: 0x7f7ffffcf1d7, count: -4
  acpi_pdirpa+0x4117aa:

For this to work, it requires using a new version of boot(8), and
booting a kernel with the .debug_line section present (e.g., building
with ``makeoptions DEBUG="-g"'' and then booting the bsd.gdb kernel
instead of the stripped bsd kernel).

Still a WIP, but no failure reports yet.  Committing so further
development and testing can happen in tree.

prodding deraadt, guenther, mlarkin
ok mpi

0 files changed, 0 insertions, 0 deletions