68 lines · python
1"""2Test that addresses of functions compiled for Arm Thumb include the Thumb mode3bit (bit 0 of the address) when resolved and used in expressions.4"""5 6import lldb7from lldbsuite.test.decorators import *8from lldbsuite.test.lldbtest import *9from lldbsuite.test import lldbutil10 11 12class TestThumbFunctionAddr(TestBase):13 def do_thumb_function_test(self, language):14 self.build(dictionary={"CFLAGS_EXTRAS": f"-x {language} -mthumb"})15 16 exe = self.getBuildArtifact("a.out")17 line = line_number("main.c", "// Set break point at this line.")18 self.runCmd("target create %s" % exe)19 bpid = lldbutil.run_break_set_by_file_and_line(self, "main.c", line)20 21 self.runCmd("run")22 self.assertIsNotNone(23 lldbutil.get_one_thread_stopped_at_breakpoint_id(self.process(), bpid),24 "Process is not stopped at breakpoint",25 )26 27 # The compiler set this, so the mode bit will be included here.28 a_function_addr_var = (29 self.thread().GetFrameAtIndex(0).FindVariable("a_function_addr")30 )31 self.assertTrue(a_function_addr_var.IsValid())32 a_function_addr = a_function_addr_var.GetValueAsUnsigned()33 self.assertTrue(a_function_addr & 1)34 35 self.expect("p/x a_function_addr", substrs=[f"0x{a_function_addr:08x}"])36 # If lldb did not pay attention to the mode bit this would SIGILL trying37 # to execute Thumb encodings in Arm mode.38 self.expect("expression -- a_function()", substrs=["= 123"])39 40 # We cannot call GetCallableLoadAdress via. the API, so we expect this41 # to not have the bit set as it's treating it as a non-function symbol.42 found_function = self.target().FindFunctions("a_function")[0]43 self.assertTrue(found_function.IsValid())44 found_function = found_function.GetFunction()45 self.assertTrue(found_function.IsValid())46 found_function_addr = found_function.GetStartAddress()47 a_function_load_addr = found_function_addr.GetLoadAddress(self.target())48 self.assertEqual(a_function_load_addr, a_function_addr & ~1)49 50 # image lookup should not include the mode bit.51 a_function_file_addr = found_function_addr.GetFileAddress()52 self.expect(53 "image lookup -n a_function", substrs=[f"0x{a_function_file_addr:08x}"]54 )55 56 # This test is run for C and C++ because the two will take different paths57 # trying to resolve the function's address.58 59 @skipIf(archs=no_match(["arm$"]))60 @skipIf(archs=["arm64"])61 def test_function_addr_c(self):62 self.do_thumb_function_test("c")63 64 @skipIf(archs=no_match(["arm$"]))65 @skipIf(archs=["arm64"])66 def test_function_addr_cpp(self):67 self.do_thumb_function_test("c++")68