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#-
# Copyright (c) 2022 The FreeBSD Foundation
#
# This software was developed by Mark Johnston under sponsorship from the
# FreeBSD Foundation.
#
import gdb
def symval(name):
return gdb.lookup_global_symbol(name).value()
def tid_to_gdb_thread(tid):
for thread in gdb.inferiors()[0].threads():
if thread.ptid[2] == tid:
return thread
else:
return None
def all_pcpus():
mp_maxid = symval("mp_maxid")
cpuid_to_pcpu = symval("cpuid_to_pcpu")
cpu = 0
while cpu <= mp_maxid:
pcpu = cpuid_to_pcpu[cpu]
if pcpu:
yield pcpu
cpu = cpu + 1
class acttrace(gdb.Command):
def __init__(self):
super(acttrace, self).__init__("acttrace", gdb.COMMAND_USER)
def invoke(self, arg, from_tty):
# Save the current thread so that we can switch back after.
curthread = gdb.selected_thread()
for pcpu in all_pcpus():
td = pcpu['pc_curthread']
tid = td['td_tid']
gdb_thread = tid_to_gdb_thread(tid)
if gdb_thread is None:
print("failed to find GDB thread with TID {}".format(tid))
else:
gdb_thread.switch()
p = td['td_proc']
print("Tracing command {} pid {} tid {} (CPU {})".format(
p['p_comm'], p['p_pid'], td['td_tid'], pcpu['pc_cpuid']))
gdb.execute("bt")
print()
curthread.switch()
# Registers the command with gdb, doesn't do anything.
acttrace()
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