Duncan McBain
a74ac064d2
The workaround for x86_64 which changed the handling of SIGILL signals is also required on 32-bit ARM platforms, because __builtin_trap(), which compiles to a UDF instruction, also generates SIGILL. If we don't change the handling here, the inferior is killed and the stop reason is "none". The failure is here: https://lab.llvm.org/buildbot/#/builders/18/builds/25948
80 lines
2.6 KiB
Python
80 lines
2.6 KiB
Python
"""
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Test that lldb can continue past a __builtin_debugtrap, but not a __builtin_trap
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"""
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import lldb
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import lldbsuite.test.lldbutil as lldbutil
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from lldbsuite.test.decorators import *
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from lldbsuite.test.lldbtest import *
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class BuiltinDebugTrapTestCase(TestBase):
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NO_DEBUG_INFO_TESTCASE = True
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def test(self):
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platform_stop_reason = lldb.eStopReasonSignal
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platform = self.getPlatform()
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if self.platformIsDarwin() or platform == "windows":
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platform_stop_reason = lldb.eStopReasonException
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self.build()
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(target, process, thread, bkpt) = lldbutil.run_to_source_breakpoint(
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self, "// Set a breakpoint here", lldb.SBFileSpec("main.c")
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)
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# Continue to __builtin_debugtrap()
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process.Continue()
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if self.TraceOn():
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self.runCmd("f")
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self.runCmd("bt")
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self.runCmd("ta v global")
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self.assertEqual(
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process.GetSelectedThread().GetStopReason(), platform_stop_reason
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)
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list = target.FindGlobalVariables("global", 1, lldb.eMatchTypeNormal)
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self.assertEqual(list.GetSize(), 1)
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global_value = list.GetValueAtIndex(0)
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self.assertEqual(global_value.GetValueAsUnsigned(), 5)
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# Continue to the __builtin_trap() -- we should be able to
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# continue past __builtin_debugtrap.
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process.Continue()
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if self.TraceOn():
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self.runCmd("f")
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self.runCmd("bt")
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self.runCmd("ta v global")
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self.assertEqual(
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process.GetSelectedThread().GetStopReason(), platform_stop_reason
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)
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# "global" is now 10.
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self.assertEqual(global_value.GetValueAsUnsigned(), 10)
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# Change the handling of SIGILL on Linux - do not pass it to the
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# inferior, but stop and notify lldb. If we don't do this, the
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# inferior will receive the SIGILL and be terminated. On x86_64,
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# __builtin_trap() emits UD2; on ARM it emits UDF — both generate
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# SIGILL. AArch64 uses BRK #1 (SIGTRAP, already suppressed by
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# default), so this is harmless there.
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if platform == "linux":
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self.runCmd("process handle -p false SIGILL")
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# We should be at the same point as before -- cannot advance
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# past a __builtin_trap().
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process.Continue()
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if self.TraceOn():
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self.runCmd("f")
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self.runCmd("bt")
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self.runCmd("ta v global")
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self.assertEqual(
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process.GetSelectedThread().GetStopReason(), platform_stop_reason
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)
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# "global" is still 10.
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self.assertEqual(global_value.GetValueAsUnsigned(), 10)
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