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from __future__ import print_function
#
# Test some of the system debug features with the multiarch memory
# test. It is a port of the original vmlinux focused test case but
# using the "memory" test instead.
#
# This is launched via tests/guest-debug/run-test.py
#
import gdb
from test_gdbstub import gdb_exit, main, report
def check_interrupt(thread):
"""
Check that, if thread is resumed, we go back to the same thread when the
program gets interrupted.
"""
# Switch to the thread we're going to be running the test in.
print("thread ", thread.num)
gdb.execute("thr %d" % thread.num)
# Enter the loop() function on this thread.
#
# While there are cleaner ways to do this, we want to minimize the number of
# side effects on the gdbstub's internal state, since those may mask bugs.
# Ideally, there should be no difference between what we're doing here and
# the program reaching the loop() function on its own.
#
# For this to be safe, we only need the prologue of loop() to not have
# instructions that may have problems with what we're doing here. We don't
# have to worry about anything else, as this function never returns.
gdb.execute("set $pc = loop")
# Continue and then interrupt the task.
gdb.post_event(lambda: gdb.execute("interrupt"))
gdb.execute("c")
# Check whether the thread we're in after the interruption is the same we
# ran continue from.
return (thread.num == gdb.selected_thread().num)
def run_test():
"""
Test if interrupting the code always lands us on the same thread when
running with scheduler-lock enabled.
"""
if len(gdb.selected_inferior().threads()) == 1:
print("SKIP: set to run on a single thread")
gdb_exit(0)
gdb.execute("set scheduler-locking on")
for thread in gdb.selected_inferior().threads():
report(check_interrupt(thread),
"thread %d resumes correctly on interrupt" % thread.num)
main(run_test)
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