| """ |
| Watch 4 bytes which spawn two doubleword aligned regions. |
| On a target that supports 8 byte watchpoints, this will |
| need to be implemented with a hardware watchpoint on both |
| doublewords. |
| """ |
| |
| |
| import lldb |
| from lldbsuite.test.decorators import * |
| from lldbsuite.test.lldbtest import * |
| from lldbsuite.test import lldbutil |
| |
| |
| class UnalignedWatchpointTestCase(TestBase): |
| def hit_watchpoint_and_continue(self, process, iter_str): |
| process.Continue() |
| self.assertEqual(process.GetState(), lldb.eStateStopped, iter_str) |
| thread = process.GetSelectedThread() |
| self.assertEqual(thread.GetStopReason(), lldb.eStopReasonWatchpoint, iter_str) |
| self.assertEqual(thread.GetStopReasonDataCount(), 1, iter_str) |
| wp_num = thread.GetStopReasonDataAtIndex(0) |
| self.assertEqual(wp_num, 1, iter_str) |
| |
| NO_DEBUG_INFO_TESTCASE = True |
| |
| # debugserver on AArch64 has this feature. |
| @skipIf(archs=no_match(["x86_64", "arm64", "arm64e", "aarch64"])) |
| @skipUnlessDarwin |
| # debugserver only started returning an exception address within |
| # a range lldb expects in https://reviews.llvm.org/D147820 2023-04-12. |
| # older debugservers will return the base address of the doubleword |
| # which lldb doesn't understand, and will stop executing without a |
| # proper stop reason. |
| @skipIfOutOfTreeDebugserver |
| def test_unaligned_watchpoint(self): |
| """Test a watchpoint that is handled by two hardware watchpoint registers.""" |
| self.build() |
| self.main_source_file = lldb.SBFileSpec("main.c") |
| (target, process, thread, bkpt) = lldbutil.run_to_source_breakpoint( |
| self, "break here", self.main_source_file |
| ) |
| |
| frame = thread.GetFrameAtIndex(0) |
| |
| a_bytebuf_6 = frame.GetValueForVariablePath("a.bytebuf[6]") |
| a_bytebuf_6_addr = a_bytebuf_6.GetAddress().GetLoadAddress(target) |
| err = lldb.SBError() |
| wp = target.WatchAddress(a_bytebuf_6_addr, 4, False, True, err) |
| self.assertTrue(err.Success()) |
| self.assertTrue(wp.IsEnabled()) |
| self.assertEqual(wp.GetWatchSize(), 4) |
| self.assertGreater( |
| wp.GetWatchAddress() % 8, 4, "watched region spans two doublewords" |
| ) |
| |
| # We will hit our watchpoint 6 times during the execution |
| # of the inferior. If the remote stub does not actually split |
| # the watched region into two doubleword watchpoints, we will |
| # exit before we get to 6 watchpoint hits. |
| for i in range(1, 7): |
| self.hit_watchpoint_and_continue(process, "wp hit number %s" % i) |
