lldb/test/API/linux/aarch64/unwind_signal/TestUnwindSignal.py

   1 """Test that we can unwind out of a signal handler.
   2    Which for AArch64 Linux requires a specific unwind plan."""
   3
   4
   5 import lldb
   6 from lldbsuite.test.decorators import *
   7 from lldbsuite.test.lldbtest import *
   8 from lldbsuite.test import lldbutil
   9
  10
  11 class UnwindSignalTestCase(TestBase):
  12     NO_DEBUG_INFO_TESTCASE = True
  13
  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 unwind
  19         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 handler
  45         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 = False
  58         for frame in thread.get_thread_frames():
  59             if frame.GetDisplayFunctionName() == "sigill":
  60                 # We should have ascending values in the x registers
  61                 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 = True
  73                 break
  74
  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)