gbd_chibios.py

import gdb
from collections import namedtuple

THREAD_STATES = [
  "READY", "CURRENT", "WTSTART", "SUSPENDED", "QUEUED", "WTSEM", "WTMTX",
  "WTCOND", "SLEEPING", "WTEXIT", "WTOREVT", "WTANDEVT", "SNDMSGQ",
  "SNDMSG", "WTMSG", "FINAL"]

Thread = namedtuple('Thread', ('r13', 'stklimit', 'name', 'state'))

def get_thread(thread):
    void_p = gdb.lookup_type('void').pointer()

    # Grab stack pointer
    r13 = thread['p_ctx']['r13'].cast(void_p)

    stklimit = thread['p_stklimit']
    name = thread['p_name'].string()

    if not name:
        name = "<no name>"

    state = THREAD_STATES[int(thread['p_state'])]

    return Thread(r13=r13, stklimit=stklimit, name=name, state=state)

def chibios_get_threads():
    """ Create a list of ChibiosThreads for all threads currently in
    the system

    """
    # Walk the thread registry
    rlist_p = gdb.parse_and_eval('&ch.rlist')

    rlist_as_thread = rlist_p.cast(gdb.lookup_type('thread_t').pointer())

    newer = rlist_as_thread.dereference()['p_newer']
    older = rlist_as_thread.dereference()['p_older']

    while newer != rlist_as_thread:
        yield get_thread(newer.dereference())

        previous = newer
        newer = newer.dereference()['p_newer']
        older = newer.dereference()['p_older']

        if older != previous:
            raise gdb.GdbError('Rlist pointer invalid--corrupt list?')


class ThreadsCommand(gdb.Command):
    thread_format = "'{name:20s}'"
    def __init__ (self):
        super(ThreadsCommand, self).__init__ ("chthreads", gdb.COMMAND_USER)

    def invoke(self, arg, from_tty):
        print("Name                \tStack pointer\tStack limit\tState\t")
        for t in chibios_get_threads():
            print("{:20s}\t0x{:08x}\t0x{:08x}\t{}".format(t.name, long(t.r13), long(t.stklimit), t.state))


ThreadsCommand()