diff --git a/gdb/ChangeLog b/gdb/ChangeLog
index 9544c617fe..7113eb4db4 100644
--- a/gdb/ChangeLog
+++ b/gdb/ChangeLog
@@ -1,3 +1,14 @@
+2010-06-07  Jan Kratochvil  <jan.kratochvil@redhat.com>
+
+	* dwarf2loc.c (struct dwarf_expr_baton) Replace objfile by per_cu.
+	(dwarf_expr_tls_address): Use per_cu instead of objfile.
+	(dwarf2_evaluate_loc_desc): Drop initialization of BATON.OBJFILE.
+	Initialize new BATON.PER_CU.  Adjust CTX->GDBARCH initialization for
+	this change.
+	(struct needs_frame_baton): New field per_cu.
+	(dwarf2_loc_desc_needs_frame): Initialize new BATON.PER_CU.
+	* dwarf2read.c (struct dwarf2_per_cu_data) <cu>: Extend the comment.
+
 2010-06-07  Sami Wagiaalla  <swagiaal@redhat.com>
 
 	* cp-support.c (make_symbol_overload_list_namespace): Only search
diff --git a/gdb/dwarf2loc.c b/gdb/dwarf2loc.c
index b14a4ac9b8..9864c466a9 100644
--- a/gdb/dwarf2loc.c
+++ b/gdb/dwarf2loc.c
@@ -122,7 +122,7 @@ find_location_expression (struct dwarf2_loclist_baton *baton,
 struct dwarf_expr_baton
 {
   struct frame_info *frame;
-  struct objfile *objfile;
+  struct dwarf2_per_cu_data *per_cu;
 };
 
 /* Helper functions for dwarf2_evaluate_loc_desc.  */
@@ -227,8 +227,9 @@ static CORE_ADDR
 dwarf_expr_tls_address (void *baton, CORE_ADDR offset)
 {
   struct dwarf_expr_baton *debaton = (struct dwarf_expr_baton *) baton;
+  struct objfile *objfile = dwarf2_per_cu_objfile (debaton->per_cu);
 
-  return target_translate_tls_address (debaton->objfile, offset);
+  return target_translate_tls_address (objfile, offset);
 }
 
 struct piece_closure
@@ -801,12 +802,12 @@ dwarf2_evaluate_loc_desc (struct type *type, struct frame_info *frame,
     }
 
   baton.frame = frame;
-  baton.objfile = dwarf2_per_cu_objfile (per_cu);
+  baton.per_cu = per_cu;
 
   ctx = new_dwarf_expr_context ();
   old_chain = make_cleanup_free_dwarf_expr_context (ctx);
 
-  ctx->gdbarch = get_objfile_arch (baton.objfile);
+  ctx->gdbarch = get_objfile_arch (dwarf2_per_cu_objfile (per_cu));
   ctx->addr_size = dwarf2_per_cu_addr_size (per_cu);
   ctx->baton = &baton;
   ctx->read_reg = dwarf_expr_read_reg;
@@ -907,6 +908,7 @@ dwarf2_evaluate_loc_desc (struct type *type, struct frame_info *frame,
 struct needs_frame_baton
 {
   int needs_frame;
+  struct dwarf2_per_cu_data *per_cu;
 };
 
 /* Reads from registers do require a frame.  */
@@ -973,6 +975,7 @@ dwarf2_loc_desc_needs_frame (const gdb_byte *data, unsigned short size,
   struct cleanup *old_chain;
 
   baton.needs_frame = 0;
+  baton.per_cu = per_cu;
 
   ctx = new_dwarf_expr_context ();
   old_chain = make_cleanup_free_dwarf_expr_context (ctx);
diff --git a/gdb/dwarf2read.c b/gdb/dwarf2read.c
index 61159390f4..6a6f1cb2b4 100644
--- a/gdb/dwarf2read.c
+++ b/gdb/dwarf2read.c
@@ -337,7 +337,8 @@ struct dwarf2_per_cu_data
      Otherwise it's from .debug_info.  */
   unsigned int from_debug_types : 1;
 
-  /* Set iff currently read in.  */
+  /* Set to non-NULL iff this CU is currently loaded.  When it gets freed out
+     of the CU cache it gets reset to NULL again.  */
   struct dwarf2_cu *cu;
 
   /* If full symbols for this CU have been read in, then this field