83 lines · python
1"""Test that we can unwind out of a signal handler.2 Which for AArch64 Linux requires a specific unwind plan."""3 4 5import lldb6from lldbsuite.test.decorators import *7from lldbsuite.test.lldbtest import *8from lldbsuite.test import lldbutil9 10 11class UnwindSignalTestCase(TestBase):12 NO_DEBUG_INFO_TESTCASE = True13 14 @skipUnlessArch("aarch64")15 @skipUnlessPlatform(["linux"])16 def test_unwind_signal(self):17 """Inferior calls sigill() and handles the resultant SIGILL.18 Stopped at a breakpoint in the handler, check that we can unwind19 back to sigill() and get the expected register contents there."""20 self.build()21 exe = self.getBuildArtifact("a.out")22 23 target = self.dbg.CreateTarget(exe)24 self.assertTrue(target, VALID_TARGET)25 26 process = target.LaunchSimple(None, None, self.get_process_working_directory())27 self.assertTrue(process, PROCESS_IS_VALID)28 self.assertState(process.GetState(), lldb.eStateStopped)29 signo = process.GetUnixSignals().GetSignalNumberFromName("SIGILL")30 31 thread = lldbutil.get_stopped_thread(process, lldb.eStopReasonSignal)32 self.assertTrue(33 thread and thread.IsValid(), "Thread should be stopped due to a signal"34 )35 self.assertGreaterEqual(36 thread.GetStopReasonDataCount(), 1, "There should be data in the event."37 )38 self.assertEqual(39 thread.GetStopReasonDataAtIndex(0),40 signo,41 "The stop signal should be SIGILL",42 )43 44 # Continue to breakpoint in sigill handler45 bkpt = target.FindBreakpointByID(46 lldbutil.run_break_set_by_source_regexp(self, "Set a breakpoint here")47 )48 threads = lldbutil.continue_to_breakpoint(process, bkpt)49 self.assertEqual(len(threads), 1, "Expected single thread")50 thread = threads[0]51 52 # Expect breakpoint in 'handler'53 frame = thread.GetFrameAtIndex(0)54 self.assertEqual(frame.GetDisplayFunctionName(), "handler", "Unexpected break?")55 56 # Expect that unwinding should find 'sigill'57 found_caller = False58 for frame in thread.get_thread_frames():59 if frame.GetDisplayFunctionName() == "sigill":60 # We should have ascending values in the x registers61 regs = frame.GetRegisters().GetValueAtIndex(0)62 err = lldb.SBError()63 64 for i in range(31):65 name = "x{}".format(i)66 value = regs.GetChildMemberWithName(name).GetValueAsUnsigned(err)67 self.assertSuccess(err, "Failed to get register {}".format(name))68 self.assertEqual(69 value, i, "Unexpected value for register {}".format(name)70 )71 72 found_caller = True73 break74 75 self.assertTrue(76 found_caller, "Unwinding did not find func that caused the SIGILL"77 )78 79 # Continue until we exit.80 process.Continue()81 self.assertState(process.GetState(), lldb.eStateExited)82 self.assertEqual(process.GetExitStatus(), 0)83