1from __future__ import print_function 2# 3# Test some of the system debug features with the multiarch memory 4# test. It is a port of the original vmlinux focused test case but 5# using the "memory" test instead. 6# 7# This is launched via tests/guest-debug/run-test.py 8# 9 10import gdb 11from test_gdbstub import main, report 12 13 14def check_interrupt(thread): 15 """ 16 Check that, if thread is resumed, we go back to the same thread when the 17 program gets interrupted. 18 """ 19 20 # Switch to the thread we're going to be running the test in. 21 print("thread ", thread.num) 22 gdb.execute("thr %d" % thread.num) 23 24 # Enter the loop() function on this thread. 25 # 26 # While there are cleaner ways to do this, we want to minimize the number of 27 # side effects on the gdbstub's internal state, since those may mask bugs. 28 # Ideally, there should be no difference between what we're doing here and 29 # the program reaching the loop() function on its own. 30 # 31 # For this to be safe, we only need the prologue of loop() to not have 32 # instructions that may have problems with what we're doing here. We don't 33 # have to worry about anything else, as this function never returns. 34 gdb.execute("set $pc = loop") 35 36 # Continue and then interrupt the task. 37 gdb.post_event(lambda: gdb.execute("interrupt")) 38 gdb.execute("c") 39 40 # Check whether the thread we're in after the interruption is the same we 41 # ran continue from. 42 return (thread.num == gdb.selected_thread().num) 43 44 45def run_test(): 46 """ 47 Test if interrupting the code always lands us on the same thread when 48 running with scheduler-lock enabled. 49 """ 50 if len(gdb.selected_inferior().threads()) == 1: 51 print("SKIP: set to run on a single thread") 52 exit(0) 53 54 gdb.execute("set scheduler-locking on") 55 for thread in gdb.selected_inferior().threads(): 56 report(check_interrupt(thread), 57 "thread %d resumes correctly on interrupt" % thread.num) 58 59 60main(run_test) 61