[MIPS] Initial checkin for MIPS changes for GOLD.

gold/target.h

Index: gold/target.h
===================================================================
--- a/gold/target.h
+++ b/gold/target.h
@@ -60,6 +60,7 @@
 class Output_section;
 class Input_objects;
 class Task;
+class Output_data_dynamic;
 
 // The abstract class for target specific handling.
 
@@ -203,6 +204,11 @@
 		    Symbol_table* symtab)
   { return this->do_finalize_sections(layout, input_objects, symtab); }
 
+  // Fix data that are known after finalize_sections for MIPS (and possible
+  // some other architectures).
+  void fix_sections(Layout* layout, Symbol_table* symtab)
+  { return this->do_fix_sections(layout, symtab); }
+
   // Return the value to use for a global symbol which needs a special
   // value in the dynamic symbol table.  This will only be called if
   // the backend first calls symbol->set_needs_dynsym_value().
@@ -235,6 +241,11 @@
   is_local_label_name(const char* name) const
   { return this->do_is_local_label_name(name); }
 
+  // Get the value for target specific dynamic tags.
+  unsigned int
+  dynamic_tag_value(elfcpp::DT tag) const
+  { return this->do_dynamic_tag_value(tag); }
+
   // Get the symbol index to use for a target specific reloc.
   unsigned int
   reloc_symbol_index(void* arg, unsigned int type) const
@@ -401,6 +412,12 @@
   define_standard_symbols(Symbol_table* symtab, Layout* layout)
   { this->do_define_standard_symbols(symtab, layout); }
 
+  // Return address of .text section. Some architecutres needs it as entry

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

I would prefer not have this change and the stuff that 
depends on it in this CL.
It wont help for pnacl, and it seems to be one of these changes that add only a
little bit of convenience which is probably outweight by the complexity it
introduces.

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

This part is added to have same behavior as ld. We can remove it from this
patch, but will be needed for GOLD main trunk submission.

+  // point if _start symbol is not defined and no -e option is used.
+  virtual uint64_t
+  text_section_address() const
+  { return 0; }
+
  protected:
   // This struct holds the constant information for a child class.  We
   // use a struct to avoid the overhead of virtual function calls for
@@ -467,6 +484,11 @@
   { }
 
   // Virtual function which may be implemented by the child class.
+  virtual void
+  do_fix_sections(Layout*, Symbol_table*)
+  { }
+
+  // Virtual function which may be implemented by the child class.
   virtual uint64_t
   do_dynsym_value(const Symbol*) const
   { gold_unreachable(); }
@@ -495,6 +517,12 @@
   do_is_local_label_name(const char*) const;
 
   // Virtual function that must be overridden by a target which uses
+  // target specific dynamic tags.
+  virtual unsigned int
+  do_dynamic_tag_value(elfcpp::DT) const
+  { gold_unreachable(); }
+
+  // Virtual function that must be overridden by a target which uses
   // target specific relocations.
   virtual unsigned int
   do_reloc_symbol_index(void*, unsigned int) const