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"""Test that we can unwind out of a signal handler.
Which for AArch64 Linux requires a specific unwind plan."""
import lldb
from lldbsuite.test.decorators import *
from lldbsuite.test.lldbtest import *
from lldbsuite.test import lldbutil
class UnwindSignalTestCase(TestBase):
NO_DEBUG_INFO_TESTCASE = True
@skipUnlessArch("aarch64")
@skipUnlessPlatform(["linux"])
def test_unwind_signal(self):
"""Inferior calls sigill() and handles the resultant SIGILL.
Stopped at a breakpoint in the handler, check that we can unwind
back to sigill() and get the expected register contents there."""
self.build()
exe = self.getBuildArtifact("a.out")
target = self.dbg.CreateTarget(exe)
self.assertTrue(target, VALID_TARGET)
process = target.LaunchSimple(None, None, self.get_process_working_directory())
self.assertTrue(process, PROCESS_IS_VALID)
self.assertState(process.GetState(), lldb.eStateStopped)
signo = process.GetUnixSignals().GetSignalNumberFromName("SIGILL")
thread = lldbutil.get_stopped_thread(process, lldb.eStopReasonSignal)
self.assertTrue(
thread and thread.IsValid(), "Thread should be stopped due to a signal"
)
self.assertTrue(
thread.GetStopReasonDataCount() >= 1, "There should be data in the event."
)
self.assertEqual(
thread.GetStopReasonDataAtIndex(0),
signo,
"The stop signal should be SIGILL",
)
# Continue to breakpoint in sigill handler
bkpt = target.FindBreakpointByID(
lldbutil.run_break_set_by_source_regexp(self, "Set a breakpoint here")
)
threads = lldbutil.continue_to_breakpoint(process, bkpt)
self.assertEqual(len(threads), 1, "Expected single thread")
thread = threads[0]
# Expect breakpoint in 'handler'
frame = thread.GetFrameAtIndex(0)
self.assertEqual(frame.GetDisplayFunctionName(), "handler", "Unexpected break?")
# Expect that unwinding should find 'sigill'
found_caller = False
for frame in thread.get_thread_frames():
if frame.GetDisplayFunctionName() == "sigill":
# We should have ascending values in the x registers
regs = frame.GetRegisters().GetValueAtIndex(0)
err = lldb.SBError()
for i in range(31):
name = "x{}".format(i)
value = regs.GetChildMemberWithName(name).GetValueAsUnsigned(err)
self.assertSuccess(err, "Failed to get register {}".format(name))
self.assertEqual(
value, i, "Unexpected value for register {}".format(name)
)
found_caller = True
break
self.assertTrue(
found_caller, "Unwinding did not find func that caused the SIGILL"
)
# Continue until we exit.
process.Continue()
self.assertState(process.GetState(), lldb.eStateExited)
self.assertEqual(process.GetExitStatus(), 0)
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