[MIPS] Initial checkin for MIPS changes for GOLD.

gold/output.h

Index: gold/output.h
===================================================================
--- a/gold/output.h
+++ b/gold/output.h
@@ -1776,6 +1776,10 @@
   // Add an absolute relocation.
 
   void
+  add_absolute_null(unsigned int type, Output_data* od, Address address)

[robertm, 2012/04/27 19:46:15]

in the spirit of keeping the deltas small - can this be avoided?

[Aleksandar Simeonov, 2012/05/08 15:21:42]

Since R_MIPS_NONE entry with address 0 has to be first in .rel.dyn section this
function is needed to create it (there is no function that can do that in
original Gold).

We can avoid this in PNaCl patch, but will have to be added to main GOLD
repository. 

+  { this->add(od, Output_reloc_type(type, NULL, address)); }
+
+  void
   add_absolute(unsigned int type, Output_data* od, Address address)
   { this->add(od, Output_reloc_type(type, od, address)); }
 
@@ -2424,6 +2428,11 @@
   add_string(elfcpp::DT tag, const std::string& str)
   { this->add_string(tag, str.c_str()); }
 
+  // Add a new dynamic entry with target specific value.
+  void
+  add_target_specific(elfcpp::DT tag)
+  { this->add_entry(Dynamic_entry(tag)); }
+
  protected:
   // Adjust the output section to set the entry size.
   void
@@ -2488,6 +2497,11 @@
       : tag_(tag), offset_(DYNAMIC_STRING)
     { this->u_.str = str; }
 
+    // Create an entry with a target specific value.
+    Dynamic_entry(elfcpp::DT tag)
+      : tag_(tag), offset_(DYNAMIC_TARGET)
+    { };
+
     // Return the tag of this entry.
     elfcpp::DT
     tag() const
@@ -2511,7 +2525,9 @@
       // Symbol adress.
       DYNAMIC_SYMBOL = -3U,
       // String.
-      DYNAMIC_STRING = -4U
+      DYNAMIC_STRING = -4U,
+      // Target specific value.
+      DYNAMIC_TARGET = -5U
       // Any other value indicates a section address plus OFFSET.
     };