9db2541d4c
This adds a specific unwind plan for AArch64 Linux sigreturn frames. Previously we assumed that the fp would be valid here but it is not. https://github.com/torvalds/linux/blob/master/arch/arm64/kernel/vdso/sigreturn.S On Ubuntu Bionic it happened to point to an old frame info which meant you got what looked like a correct backtrace. On Focal, the info is completely invalid. (probably due to some code shuffling in libc) This adds an UnwindPlan that knows that the sp in a sigreturn frame points to an rt_sigframe from which we can offset to get saved sp and pc values to backtrace correctly. Based on LibUnwind's change: https://reviews.llvm.org/D90898 A new test is added that sets all compares the frames from the initial signal catch to the handler break. Ensuring that the stack/frame pointer, function name and register values match. (this test is AArch64 Linux specific because it's the only one with a specific unwind plan for this situation) Fixes https://bugs.llvm.org/show_bug.cgi?id=52165 Reviewed By: omjavaid, labath Differential Revision: https://reviews.llvm.org/D112069
71 lines
2.5 KiB
Python
71 lines
2.5 KiB
Python
"""Test that we can unwind out of a SIGABRT handler"""
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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 HandleAbortTestCase(TestBase):
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mydir = TestBase.compute_mydir(__file__)
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NO_DEBUG_INFO_TESTCASE = True
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@skipIfWindows # signals do not exist on Windows
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@expectedFailureNetBSD
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def test_inferior_handle_sigabrt(self):
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"""Inferior calls abort() and handles the resultant SIGABRT.
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Stopped at a breakpoint in the handler, verify that the backtrace
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includes the function that called abort()."""
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self.build()
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exe = self.getBuildArtifact("a.out")
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# Create a target by the debugger.
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target = self.dbg.CreateTarget(exe)
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self.assertTrue(target, VALID_TARGET)
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# launch
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process = target.LaunchSimple(
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None, None, self.get_process_working_directory())
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self.assertTrue(process, PROCESS_IS_VALID)
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self.assertEqual(process.GetState(), lldb.eStateStopped)
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signo = process.GetUnixSignals().GetSignalNumberFromName("SIGABRT")
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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(),
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"Thread should be stopped due to a signal")
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self.assertTrue(
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thread.GetStopReasonDataCount() >= 1,
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"There should be data in the event.")
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self.assertEqual(thread.GetStopReasonDataAtIndex(0),
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signo, "The stop signal should be SIGABRT")
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# Continue to breakpoint in abort 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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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 'abort_caller'
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foundFoo = False
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for frame in thread:
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if frame.GetDisplayFunctionName() == "abort_caller":
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foundFoo = True
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self.assertTrue(foundFoo, "Unwinding did not find func that called abort")
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# Continue until we exit.
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process.Continue()
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self.assertEqual(process.GetState(), lldb.eStateExited)
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self.assertEqual(process.GetExitStatus(), 0)
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