Changes for Bug 17384

Summary:
Virtual dynamic shared objects, or vdso files were 
not loaded for Linux OS.In Bug 17384 the call 
stack could not be unwinded from functions
residing in the vdso object.

This commit adds support for loading such files by
reading the Aux vectors since a vdso is invisibily 
mapped to the inferiors address space and the
 actual file is not present in the filesystem. The 
presence of the vdso is detected by inspecting 
the Aux vector for AT_SYSINFO_EHDR tag.

Reviewers: lldb-commits, ovyalov, tberghammer

Subscribers: lldb-commits

Differential Revision: http://reviews.llvm.org/D14118

llvm-svn: 251505

1 files changed, 9 insertions, 4 deletions

diff --git a/lldb/test/functionalities/inferior-assert/TestInferiorAssert.py b/lldb/test/functionalities/inferior-assert/TestInferiorAssert.py
index 7bbeff6c95a..e5bc232caea 100644
--- a/lldb/test/functionalities/inferior-assert/TestInferiorAssert.py
+++ b/lldb/test/functionalities/inferior-assert/TestInferiorAssert.py
@@ -12,7 +12,6 @@ class AssertingInferiorTestCase(TestBase):
 
     mydir = TestBase.compute_mydir(__file__)
 
-    @expectedFailurei386("llvm.org/pr17384: lldb needs to be aware of linux-vdso.so to unwind stacks properly")
     @expectedFailureWindows("llvm.org/pr21793: need to implement support for detecting assertion / abort on Windows")
     def test_inferior_asserting(self):
         """Test that lldb reliably catches the inferior asserting (command)."""
@@ -26,7 +25,6 @@ class AssertingInferiorTestCase(TestBase):
         self.build()
         self.inferior_asserting_registers()
 
-    @expectedFailurei386("llvm.org/pr17384: lldb needs to be aware of linux-vdso.so to unwind stacks properly")
     @expectedFailureWindows("llvm.org/pr21793: need to implement support for detecting assertion / abort on Windows")
     def test_inferior_asserting_disassemble(self):
         """Test that lldb reliably disassembles frames after asserting (command)."""
@@ -40,14 +38,12 @@ class AssertingInferiorTestCase(TestBase):
         self.build()
         self.inferior_asserting_python()
 
-    @expectedFailurei386('llvm.org/pr17384: lldb needs to be aware of linux-vdso.so to unwind stacks properly')
     @expectedFailureWindows("llvm.org/pr21793: need to implement support for detecting assertion / abort on Windows")
     def test_inferior_asserting_expr(self):
         """Test that the lldb expression interpreter can read from the inferior after asserting (command)."""
         self.build()
         self.inferior_asserting_expr()
 
-    @expectedFailurei386("llvm.org/pr17384: lldb needs to be aware of linux-vdso.so to unwind stacks properly")
     @expectedFailureWindows("llvm.org/pr21793: need to implement support for detecting assertion / abort on Windows")
     def test_inferior_asserting_step(self):
         """Test that lldb functions correctly after stepping through a call to assert()."""
@@ -146,6 +142,12 @@ class AssertingInferiorTestCase(TestBase):
         thread = process.GetThreadAtIndex(0)
         self.assertTrue(thread.IsValid(), "current thread is valid")
 
+        lastframeID = thread.GetFrameAtIndex(thread.GetNumFrames() - 1).GetFrameID()
+
+        isi386Arch = False
+        if "i386" in self.getArchitecture():
+            isi386Arch = True
+
         # lldb should be able to disassemble frames from the inferior after asserting.
         for frame in thread:
             self.assertTrue(frame.IsValid(), "current frame is valid")
@@ -160,6 +162,9 @@ class AssertingInferiorTestCase(TestBase):
             pc_backup_offset = 1
             if frame.GetFrameID() == 0:
                 pc_backup_offset = 0
+            if isi386Arch == True:
+                if lastframeID == frame.GetFrameID():
+                    pc_backup_offset = 0
             self.expect("disassemble -a %s" % (frame.GetPC() - pc_backup_offset),
                     substrs = ['<+0>: '])