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Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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import gdbfrom linux import utils, constants
if constants.LX_CONFIG_STACKDEPOT: stack_record_type = utils.CachedType('struct stack_record') DEPOT_STACK_ALIGN = 4
def help(): t = """Usage: lx-stack_depot_lookup [Hex handle value] Example: lx-stack_depot_lookup 0x00c80300\n""" gdb.write("Unrecognized command\n") raise gdb.GdbError(t)
def stack_depot_fetch(handle): global DEPOT_STACK_ALIGN global stack_record_type
stack_depot_disabled = gdb.parse_and_eval('stack_depot_disabled')
if stack_depot_disabled: raise gdb.GdbError("stack_depot_disabled\n")
handle_parts_t = gdb.lookup_type("union handle_parts") parts = handle.cast(handle_parts_t) offset = parts['offset'] << DEPOT_STACK_ALIGN pools_num = gdb.parse_and_eval('pools_num')
if handle == 0: raise gdb.GdbError("handle is 0\n")
pool_index = parts['pool_index_plus_1'] - 1 if pool_index >= pools_num: gdb.write("pool index %d out of bounds (%d) for stack id 0x%08x\n" % (parts['pool_index'], pools_num, handle)) return gdb.Value(0), 0
stack_pools = gdb.parse_and_eval('stack_pools')
try: pool = stack_pools[pool_index] stack = (pool + gdb.Value(offset).cast(utils.get_size_t_type())).cast(stack_record_type.get_type().pointer()) size = int(stack['size'].cast(utils.get_ulong_type())) return stack['entries'], size except Exception as e: gdb.write("%s\n" % e) return gdb.Value(0), 0
def stack_depot_print(handle): if not constants.LX_CONFIG_STACKDEPOT: raise gdb.GdbError("CONFIG_STACKDEPOT is not enabled")
entries, nr_entries = stack_depot_fetch(handle) if nr_entries > 0: for i in range(0, nr_entries): try: gdb.execute("x /i 0x%x" % (int(entries[i]))) except Exception as e: gdb.write("%s\n" % e)
class StackDepotLookup(gdb.Command): """Search backtrace by handle"""
def __init__(self): if constants.LX_CONFIG_STACKDEPOT: super(StackDepotLookup, self).__init__("lx-stack_depot_lookup", gdb.COMMAND_SUPPORT)
def invoke(self, args, from_tty): if not constants.LX_CONFIG_STACKDEPOT: raise gdb.GdbError('CONFIG_STACKDEPOT is not set')
argv = gdb.string_to_argv(args) if len(argv) == 1: handle = int(argv[0], 16) stack_depot_print(gdb.Value(handle).cast(utils.get_uint_type())) else: help()
StackDepotLookup()