9c2468821e
This uses [teyit](https://pypi.org/project/teyit/) to modernize asserts, as recommended by the [unittest release notes](https://docs.python.org/3.12/whatsnew/3.12.html#id3). For example, `assertTrue(a == b)` is replaced with `assertEqual(a, b)`. This produces better error messages, e.g. `error: unexpectedly found 1 and 2 to be different` instead of `error: False`.
83 lines
3.1 KiB
Python
83 lines
3.1 KiB
Python
"""Test that we can unwind out of a signal handler.
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Which for AArch64 Linux requires a specific unwind plan."""
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import lldb
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from lldbsuite.test.decorators import *
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from lldbsuite.test.lldbtest import *
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from lldbsuite.test import lldbutil
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class UnwindSignalTestCase(TestBase):
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NO_DEBUG_INFO_TESTCASE = True
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@skipUnlessArch("aarch64")
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@skipUnlessPlatform(["linux"])
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def test_unwind_signal(self):
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"""Inferior calls sigill() and handles the resultant SIGILL.
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Stopped at a breakpoint in the handler, check that we can unwind
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back to sigill() and get the expected register contents there."""
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self.build()
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exe = self.getBuildArtifact("a.out")
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target = self.dbg.CreateTarget(exe)
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self.assertTrue(target, VALID_TARGET)
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process = target.LaunchSimple(None, None, self.get_process_working_directory())
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self.assertTrue(process, PROCESS_IS_VALID)
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self.assertState(process.GetState(), lldb.eStateStopped)
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signo = process.GetUnixSignals().GetSignalNumberFromName("SIGILL")
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thread = lldbutil.get_stopped_thread(process, lldb.eStopReasonSignal)
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self.assertTrue(
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thread and thread.IsValid(), "Thread should be stopped due to a signal"
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)
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self.assertGreaterEqual(
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thread.GetStopReasonDataCount(), 1, "There should be data in the event."
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)
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self.assertEqual(
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thread.GetStopReasonDataAtIndex(0),
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signo,
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"The stop signal should be SIGILL",
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)
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# Continue to breakpoint in sigill handler
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bkpt = target.FindBreakpointByID(
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lldbutil.run_break_set_by_source_regexp(self, "Set a breakpoint here")
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)
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threads = lldbutil.continue_to_breakpoint(process, bkpt)
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self.assertEqual(len(threads), 1, "Expected single thread")
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thread = threads[0]
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# Expect breakpoint in 'handler'
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frame = thread.GetFrameAtIndex(0)
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self.assertEqual(frame.GetDisplayFunctionName(), "handler", "Unexpected break?")
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# Expect that unwinding should find 'sigill'
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found_caller = False
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for frame in thread.get_thread_frames():
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if frame.GetDisplayFunctionName() == "sigill":
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# We should have ascending values in the x registers
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regs = frame.GetRegisters().GetValueAtIndex(0)
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err = lldb.SBError()
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for i in range(31):
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name = "x{}".format(i)
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value = regs.GetChildMemberWithName(name).GetValueAsUnsigned(err)
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self.assertSuccess(err, "Failed to get register {}".format(name))
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self.assertEqual(
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value, i, "Unexpected value for register {}".format(name)
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)
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found_caller = True
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break
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self.assertTrue(
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found_caller, "Unwinding did not find func that caused the SIGILL"
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)
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# Continue until we exit.
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process.Continue()
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self.assertState(process.GetState(), lldb.eStateExited)
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self.assertEqual(process.GetExitStatus(), 0)
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