Add support for debugging KASLR kernels via kdp (the kernel being

loaded at a random offset).

To get the kernel's UUID and load address I need to send a kdp
packet so I had to implement the kernel relocation (and attempt to
find the kernel if none was provided to lldb already) in ProcessKDP
-- but this code really properly belongs in DynamicLoaderDarwinKernel.

I also had to add an optional Stream to ConnectRemote so
ProcessKDP::DoConnectRemote can print feedback about the remote kernel's
UUID, load address, and notify the user if we auto-loaded the kernel via
the UUID.

<rdar://problem/7714201>

llvm-svn: 164881

2 files changed, 21 insertions, 2 deletions

diff --git a/lldb/source/Plugins/Process/gdb-remote/ProcessGDBRemote.cpp b/lldb/source/Plugins/Process/gdb-remote/ProcessGDBRemote.cpp
index d25f134de8a..f29a1677874 100644
--- a/lldb/source/Plugins/Process/gdb-remote/ProcessGDBRemote.cpp
+++ b/lldb/source/Plugins/Process/gdb-remote/ProcessGDBRemote.cpp
@@ -414,7 +414,7 @@ ProcessGDBRemote::WillAttachToProcessWithName (const char *process_name, bool wa
 }
 
 Error
-ProcessGDBRemote::DoConnectRemote (const char *remote_url)
+ProcessGDBRemote::DoConnectRemote (Stream *strm, const char *remote_url)
 {
     Error error (WillLaunchOrAttach ());
     
@@ -427,6 +427,25 @@ ProcessGDBRemote::DoConnectRemote (const char *remote_url)
         return error;
     StartAsyncThread ();
 
+    const ArchSpec &gdb_remote_arch = m_gdb_comm.GetHostArchitecture();
+    if (gdb_remote_arch.IsValid() && gdb_remote_arch.GetTriple().getVendor() == llvm::Triple::Apple)
+    {
+        Module *exe_module = GetTarget().GetExecutableModulePointer();
+        
+        ObjectFile *exe_objfile = exe_module->GetObjectFile();
+
+        // If the remote system is an Apple device and we don't have an exec file
+        // OR we have an exec file and it is a kernel, look for the kernel's load address
+        // in memory and load/relocate the kernel symbols as appropriate.
+        if (exe_objfile == NULL 
+            || (exe_objfile->GetType() == ObjectFile::eTypeExecutable && 
+                exe_objfile->GetStrata() == ObjectFile::eStrataKernel))
+        {
+        
+
+        }
+    }
+
     lldb::pid_t pid = m_gdb_comm.GetCurrentProcessID ();
     if (pid == LLDB_INVALID_PROCESS_ID)
     {
diff --git a/lldb/source/Plugins/Process/gdb-remote/ProcessGDBRemote.h b/lldb/source/Plugins/Process/gdb-remote/ProcessGDBRemote.h
index 563b89963fa..4a716157943 100644
--- a/lldb/source/Plugins/Process/gdb-remote/ProcessGDBRemote.h
+++ b/lldb/source/Plugins/Process/gdb-remote/ProcessGDBRemote.h
@@ -94,7 +94,7 @@ public:
     WillAttachToProcessWithName (const char *process_name, bool wait_for_launch);
 
     virtual lldb_private::Error
-    DoConnectRemote (const char *remote_url);
+    DoConnectRemote (lldb_private::Stream *strm, const char *remote_url);
     
     lldb_private::Error
     WillLaunchOrAttach ();