scripts/gdb: implement 'qemu bt'

This script first runs the regular gdb's 'bt' command, and then if we are in a
coroutine it prints the coroutines backtraces in the order in which they
were called.

Signed-off-by: Maxim Levitsky <mlevitsk@redhat.com>
Message-Id: <20201217155436.927320-3-mlevitsk@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Maxim Levitsky 2020-12-17 17:54:36 +02:00 committed by Paolo Bonzini
parent 4cbf8efc5b
commit b9a0de3773
2 changed files with 28 additions and 1 deletions

View File

@ -40,6 +40,7 @@ timers.TimersCommand()
coroutine.CoroutineSPFunction() coroutine.CoroutineSPFunction()
coroutine.CoroutinePCFunction() coroutine.CoroutinePCFunction()
coroutine.CoroutineBt()
# Default to silently passing through SIGUSR1, because QEMU sends it # Default to silently passing through SIGUSR1, because QEMU sends it
# to itself a lot. # to itself a lot.

View File

@ -88,8 +88,11 @@ def bt_jmpbuf(jmpbuf):
selected_frame.select() selected_frame.select()
def co_cast(co):
return co.cast(gdb.lookup_type('CoroutineUContext').pointer())
def coroutine_to_jmpbuf(co): def coroutine_to_jmpbuf(co):
coroutine_pointer = co.cast(gdb.lookup_type('CoroutineUContext').pointer()) coroutine_pointer = co_cast(co)
return coroutine_pointer['env']['__jmpbuf'] return coroutine_pointer['env']['__jmpbuf']
@ -107,6 +110,29 @@ class CoroutineCommand(gdb.Command):
bt_jmpbuf(coroutine_to_jmpbuf(gdb.parse_and_eval(argv[0]))) bt_jmpbuf(coroutine_to_jmpbuf(gdb.parse_and_eval(argv[0])))
class CoroutineBt(gdb.Command):
'''Display backtrace including coroutine switches'''
def __init__(self):
gdb.Command.__init__(self, 'qemu bt', gdb.COMMAND_STACK,
gdb.COMPLETE_NONE)
def invoke(self, arg, from_tty):
gdb.execute("bt")
if gdb.parse_and_eval("qemu_in_coroutine()") == False:
return
co_ptr = gdb.parse_and_eval("qemu_coroutine_self()")
while True:
co = co_cast(co_ptr)
co_ptr = co["base"]["caller"]
if co_ptr == 0:
break
gdb.write("Coroutine at " + str(co_ptr) + ":\n")
bt_jmpbuf(coroutine_to_jmpbuf(co_ptr))
class CoroutineSPFunction(gdb.Function): class CoroutineSPFunction(gdb.Function):
def __init__(self): def __init__(self):
gdb.Function.__init__(self, 'qemu_coroutine_sp') gdb.Function.__init__(self, 'qemu_coroutine_sp')