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Mips target in gold - revision 2 - part 1


 Hi Cary,

Attached is the first part of the patch that implements Mips target in gold.  This part contains one new patch that changes target independent code.  adjust_dynsym.patch allows a target to adjust the value written to the dynamic symbol table.  This is needed because Mips dynamic linker expects MIPS16 and microMIPS symbols to have odd values created by adding +1 to the dynamic symbol value.

> You shouldn't need to include "stringpool.h". The set_dynsym_indexes
> function takes a Stringpool*, so you only need a forward declaration
> for class Stringpool.

Stringpool is defined as a template in file stringpool.h. If I remove "stringpool.h" then following needs to be added to file target.h:

template<typename Stringpool_char>
class Stringpool_template;

typedef Stringpool_template<char> Stringpool;


Regards,
Sasa
diff --git a/gold/ChangeLog b/gold/ChangeLog
index d2c975e..6eb1194 100644
--- a/gold/ChangeLog
+++ b/gold/ChangeLog
@@ -1,3 +1,10 @@
+2014-01-30  Sasa Stankovic  <Sasa.Stankovic@imgtec.com>
+
+	* symtab.cc (Symbol_table::set_dynsym_indexes): Allow a target to set
+	dynsym indexes.
+	* target.h (Target::has_custom_set_dynsym_indexes): New function.
+	(Target::set_dynsym_indexes): New function.
+
 2014-01-28  Cary Coutant  <ccoutant@google.com>
 
 	Add .gdb_index version 7 support.
diff --git a/gold/symtab.cc b/gold/symtab.cc
index 2e17529..7721ada 100644
--- a/gold/symtab.cc
+++ b/gold/symtab.cc
@@ -2370,6 +2370,25 @@ Symbol_table::set_dynsym_indexes(unsigned int index,
 {
   std::vector<Symbol*> as_needed_sym;
 
+  // Allow a target to set dynsym indexes.
+  if (parameters->target().has_custom_set_dynsym_indexes())
+    {
+      std::vector<Symbol*> dyn_symbols;
+      for (Symbol_table_type::iterator p = this->table_.begin();
+           p != this->table_.end();
+           ++p)
+        {
+          Symbol* sym = p->second;
+          if (!sym->should_add_dynsym_entry(this))
+            sym->set_dynsym_index(-1U);
+          else
+            dyn_symbols.push_back(sym);
+        }
+
+      return parameters->target().set_dynsym_indexes(&dyn_symbols, index, syms,
+                                                     dynpool, versions, this);
+    }
+
   for (Symbol_table_type::iterator p = this->table_.begin();
        p != this->table_.end();
        ++p)
diff --git a/gold/target.h b/gold/target.h
index 415b7ed..0a1b637 100644
--- a/gold/target.h
+++ b/gold/target.h
@@ -37,6 +37,7 @@
 #include "elfcpp.h"
 #include "options.h"
 #include "parameters.h"
+#include "stringpool.h"
 #include "debug.h"
 
 namespace gold
@@ -62,6 +63,7 @@ class Output_section;
 class Input_objects;
 class Task;
 struct Symbol_location;
+class Versions;
 
 // The abstract class for target specific handling.
 
@@ -454,6 +456,17 @@ class Target
   entry_symbol_name() const
   { return this->pti_->entry_symbol_name; }
 
+  // Whether the target has a custom set_dynsym_indexes method.
+  virtual bool
+  has_custom_set_dynsym_indexes() const
+  { return false; }
+
+  // Custom set_dynsym_indexes method for a target.
+  virtual unsigned int
+  set_dynsym_indexes(std::vector<Symbol*>*, unsigned int, std::vector<Symbol*>*,
+                     Stringpool*, Versions*, Symbol_table*) const
+  { gold_unreachable(); }
+
  protected:
   // This struct holds the constant information for a child class.  We
   // use a struct to avoid the overhead of virtual function calls for
diff --git a/gold/ChangeLog b/gold/ChangeLog
index 6eb1194..02adb24 100644
--- a/gold/ChangeLog
+++ b/gold/ChangeLog
@@ -1,5 +1,9 @@
 2014-01-30  Sasa Stankovic  <Sasa.Stankovic@imgtec.com>
 
+	* symtab.h (Symbol::set_nonvis): New function.
+
+2014-01-30  Sasa Stankovic  <Sasa.Stankovic@imgtec.com>
+
 	* symtab.cc (Symbol_table::set_dynsym_indexes): Allow a target to set
 	dynsym indexes.
 	* target.h (Target::has_custom_set_dynsym_indexes): New function.
diff --git a/gold/symtab.h b/gold/symtab.h
index 1232c97..b55b50f 100644
--- a/gold/symtab.h
+++ b/gold/symtab.h
@@ -259,6 +259,11 @@ class Symbol
   nonvis() const
   { return this->nonvis_; }
 
+  // Set the non-visibility part of the st_other field.
+  void
+  set_nonvis(unsigned int nonvis)
+  { this->nonvis_ = nonvis; }
+
   // Return whether this symbol is a forwarder.  This will never be
   // true of a symbol found in the hash table, but may be true of
   // symbol pointers attached to object files.
diff --git a/gold/ChangeLog b/gold/ChangeLog
index 02adb24..c9b27ed 100644
--- a/gold/ChangeLog
+++ b/gold/ChangeLog
@@ -1,5 +1,15 @@
 2014-01-30  Sasa Stankovic  <Sasa.Stankovic@imgtec.com>
 
+	* output.cc (Output_data_dynamic::Dynamic_entry::write):
+	Get the value of DYNAMIC_CUSTOM dynamic entry.
+	* output.h (Output_data_dynamic::add_custom): New function.
+	(Dynamic_entry::Dynamic_entry): New constructor for DYNAMIC_CUSTOM
+	dynamic entry.
+	(enum Dynamic_entry::Classification): Add DYNAMIC_CUSTOM.
+	* target.h (Target::dynamic_tag_custom_value): New function.
+
+2014-01-30  Sasa Stankovic  <Sasa.Stankovic@imgtec.com>
+
 	* symtab.h (Symbol::set_nonvis): New function.
 
 2014-01-30  Sasa Stankovic  <Sasa.Stankovic@imgtec.com>
diff --git a/gold/output.cc b/gold/output.cc
index 348ad64..abe0629 100644
--- a/gold/output.cc
+++ b/gold/output.cc
@@ -1797,6 +1797,10 @@ Output_data_dynamic::Dynamic_entry::write(
       val = pool->get_offset(this->u_.str);
       break;
 
+    case DYNAMIC_CUSTOM:
+      val = parameters->target().dynamic_tag_custom_value(this->tag_);
+      break;
+
     default:
       val = this->u_.od->address() + this->offset_;
       break;
diff --git a/gold/output.h b/gold/output.h
index 574d270..1cba0b7 100644
--- a/gold/output.h
+++ b/gold/output.h
@@ -2578,6 +2578,11 @@ class Output_data_dynamic : public Output_section_data
   add_string(elfcpp::DT tag, const std::string& str)
   { this->add_string(tag, str.c_str()); }
 
+  // Add a new dynamic entry with custom value.
+  void
+  add_custom(elfcpp::DT tag)
+  { this->add_entry(Dynamic_entry(tag)); }
+
  protected:
   // Adjust the output section to set the entry size.
   void
@@ -2642,6 +2647,11 @@ class Output_data_dynamic : public Output_section_data
       : tag_(tag), offset_(DYNAMIC_STRING)
     { this->u_.str = str; }
 
+    // Create an entry with a custom value.
+    Dynamic_entry(elfcpp::DT tag)
+      : tag_(tag), offset_(DYNAMIC_CUSTOM)
+    { }
+
     // Return the tag of this entry.
     elfcpp::DT
     tag() const
@@ -2665,7 +2675,9 @@ class Output_data_dynamic : public Output_section_data
       // Symbol adress.
       DYNAMIC_SYMBOL = -3U,
       // String.
-      DYNAMIC_STRING = -4U
+      DYNAMIC_STRING = -4U,
+      // Custom value.
+      DYNAMIC_CUSTOM = -5U
       // Any other value indicates a section address plus OFFSET.
     };
 
diff --git a/gold/target.h b/gold/target.h
index 0a1b637..18ef2c8 100644
--- a/gold/target.h
+++ b/gold/target.h
@@ -467,6 +467,11 @@ class Target
                      Stringpool*, Versions*, Symbol_table*) const
   { gold_unreachable(); }
 
+  // Get the custom dynamic tag value.
+  virtual unsigned int
+  dynamic_tag_custom_value(elfcpp::DT) const
+  { gold_unreachable(); }
+
  protected:
   // This struct holds the constant information for a child class.  We
   // use a struct to avoid the overhead of virtual function calls for
diff --git a/gold/ChangeLog b/gold/ChangeLog
index c9b27ed..0c7bf6d 100644
--- a/gold/ChangeLog
+++ b/gold/ChangeLog
@@ -1,5 +1,11 @@
 2014-01-30  Sasa Stankovic  <Sasa.Stankovic@imgtec.com>
 
+	* symtab.cc (Sized_symbol<32>::init_output_data):
+	Instantiate the template.
+	(Sized_symbol<64>::init_output_data): Likewise.
+
+2014-01-30  Sasa Stankovic  <Sasa.Stankovic@imgtec.com>
+
 	* output.cc (Output_data_dynamic::Dynamic_entry::write):
 	Get the value of DYNAMIC_CUSTOM dynamic entry.
 	* output.h (Output_data_dynamic::add_custom): New function.
diff --git a/gold/symtab.cc b/gold/symtab.cc
index 7721ada..07212ac 100644
--- a/gold/symtab.cc
+++ b/gold/symtab.cc
@@ -3641,6 +3641,32 @@ Symbol_table::define_with_copy_reloc<64>(
     elfcpp::Elf_types<64>::Elf_Addr value);
 #endif
 
+#if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_32_BIG)
+template
+void
+Sized_symbol<32>::init_output_data(const char* name, const char* version,
+				   Output_data* od, Value_type value,
+				   Size_type symsize, elfcpp::STT type,
+				   elfcpp::STB binding,
+				   elfcpp::STV visibility,
+				   unsigned char nonvis,
+				   bool offset_is_from_end,
+				   bool is_predefined);
+#endif
+
+#if defined(HAVE_TARGET_64_LITTLE) || defined(HAVE_TARGET_64_BIG)
+template
+void
+Sized_symbol<64>::init_output_data(const char* name, const char* version,
+				   Output_data* od, Value_type value,
+				   Size_type symsize, elfcpp::STT type,
+				   elfcpp::STB binding,
+				   elfcpp::STV visibility,
+				   unsigned char nonvis,
+				   bool offset_is_from_end,
+				   bool is_predefined);
+#endif
+
 #ifdef HAVE_TARGET_32_LITTLE
 template
 void
diff --git a/gold/ChangeLog b/gold/ChangeLog
index 0c7bf6d..a978b8a 100644
--- a/gold/ChangeLog
+++ b/gold/ChangeLog
@@ -1,5 +1,11 @@
 2014-01-30  Sasa Stankovic  <Sasa.Stankovic@imgtec.com>
 
+	* symtab.cc (Symbol_table::sized_write_globals): Allow a target to
+	adjust dynamic symbol value.
+	* target.h (Target::adjust_dyn_symbol): New function.
+
+2014-01-30  Sasa Stankovic  <Sasa.Stankovic@imgtec.com>
+
 	* symtab.cc (Sized_symbol<32>::init_output_data):
 	Instantiate the template.
 	(Sized_symbol<64>::init_output_data): Likewise.
diff --git a/gold/symtab.cc b/gold/symtab.cc
index 07212ac..3e7d1ae 100644
--- a/gold/symtab.cc
+++ b/gold/symtab.cc
@@ -3011,6 +3011,8 @@ Symbol_table::sized_write_globals(const Stringpool* sympool,
 	  unsigned char* pd = dynamic_view + (dynsym_index * sym_size);
 	  this->sized_write_symbol<size, big_endian>(sym, dynsym_value, shndx,
 						     binding, dynpool, pd);
+          // Allow a target to adjust dynamic symbol value.
+          parameters->target().adjust_dyn_symbol(sym, pd);
 	}
     }
 
diff --git a/gold/target.h b/gold/target.h
index 18ef2c8..796b938 100644
--- a/gold/target.h
+++ b/gold/target.h
@@ -472,6 +472,11 @@ class Target
   dynamic_tag_custom_value(elfcpp::DT) const
   { gold_unreachable(); }
 
+  // Adjust the value written to the dynamic symbol table.
+  virtual void
+  adjust_dyn_symbol(const Symbol*, unsigned char*) const
+  { }
+
  protected:
   // This struct holds the constant information for a child class.  We
   // use a struct to avoid the overhead of virtual function calls for
diff --git a/elfcpp/ChangeLog b/elfcpp/ChangeLog
index 2399da6..f5a2876 100644
--- a/elfcpp/ChangeLog
+++ b/elfcpp/ChangeLog
@@ -1,3 +1,32 @@
+2014-01-30  Sasa Stankovic  <Sasa.Stankovic@imgtec.com>
+
+	* mips.h (R _MIPS16_TLS_GD, R_MIPS16_TLS_LDM, R_MIPS16_TLS_DTPREL_HI16,
+	R_MIPS16_TLS_DTPREL_LO16, R_MIPS16_TLS_GOTTPREL,
+	R_MIPS16_TLS_TPREL_HI16, R_MIPS16_TLS_TPREL_LO16, R_MICROMIPS_26_S1,
+	R_MICROMIPS_HI16, R_MICROMIPS_LO16, R_MICROMIPS_GPREL16,
+	R_MICROMIPS_LITERAL, R_MICROMIPS_GOT16, R_MICROMIPS_PC7_S1,
+	R_MICROMIPS_PC10_S1, R_MICROMIPS_PC16_S1, R_MICROMIPS_CALL16,
+	R_MICROMIPS_GOT_DISP, R_MICROMIPS_GOT_PAGE, R_MICROMIPS_GOT_OFST,
+	R_MICROMIPS_GOT_HI16, R_MICROMIPS_GOT_LO16, R_MICROMIPS_SUB,
+	R_MICROMIPS_HIGHER, R_MICROMIPS_HIGHEST, R_MICROMIPS_CALL_HI16,
+	R_MICROMIPS_CALL_LO16, R_MICROMIPS_SCN_DISP, R_MICROMIPS_JALR,
+	R_MICROMIPS_HI0_LO16, R_MICROMIPS_TLS_GD, R_MICROMIPS_TLS_LDM,
+	R_MICROMIPS_TLS_DTPREL_HI16, R_MICROMIPS_TLS_DTPREL_LO16,
+	R_MICROMIPS_TLS_GOTTPREL, R_MICROMIPS_TLS_TPREL_HI16,
+	R_MICROMIPS_TLS_TPREL_LO16, R_MICROMIPS_GPREL7_S2,
+	R_MICROMIPS_PC23_S20, R_MIPS_EH): New enums for relocations (mips16 and
+	micromips).
+	(STO_MIPS_FLAGS): New enum constant.
+	(elf_st_is_mips16): New function.
+	(elf_st_is_micromips): New function.
+	(is_micromips): New function.
+	(abi_n32): New function.
+	(abi_n64): New function.
+	(ODK_NULL, ODK_REGINFO, ODK_EXCEPTIONS, ODK_PAD, ODK_HWPATCH, ODK_FILL,
+	ODK_TAGS, ODK_HWAND, ODK_HWOR, ODK_GP_GROUP, ODK_IDENT): New enum
+	constants.
+	* elfcpp.h (SHT_MIPS_OPTIONS): New enum constant.
+
 2013-11-17  H.J. Lu  <hongjiu.lu@intel.com>
 
 	* x86_64.h (R_X86_64_PC32_BND): New.
diff --git a/elfcpp/elfcpp.h b/elfcpp/elfcpp.h
index 067c775..f86558a 100644
--- a/elfcpp/elfcpp.h
+++ b/elfcpp/elfcpp.h
@@ -401,9 +401,11 @@ enum SHT
   // x86_64 unwind information.
   SHT_X86_64_UNWIND = 0x70000001,
 
-  //MIPS-specific section types.
-  // Register info section
+  // MIPS-specific section types.
+  // Section contains register usage information.
   SHT_MIPS_REGINFO = 0x70000006,
+  // Section contains miscellaneous options.
+  SHT_MIPS_OPTIONS = 0x7000000d,
 
   // Link editor is to sort the entries in this section based on the
   // address specified in the associated symbol table entry.
diff --git a/elfcpp/mips.h b/elfcpp/mips.h
index 8c2d8f4..b355424 100644
--- a/elfcpp/mips.h
+++ b/elfcpp/mips.h
@@ -1,7 +1,8 @@
 // mips.h -- ELF definitions specific to EM_MIPS  -*- C++ -*-
 
 // Copyright 2012 Free Software Foundation, Inc.
-// Written by Aleksandar Simeonov <aleksandar.simeonov@rt-rk.com>.
+// Written by Sasa Stankovic <sasa.stankovic@rt-rk.com>
+//        and Aleksandar Simeonov <aleksandar.simeonov@rt-rk.com>.
 
 // This file is part of elfcpp.
 
@@ -46,16 +47,16 @@ enum
 {
   R_MIPS_NONE = 0,
   R_MIPS_16 = 1,
-  R_MIPS_32 = 2,
-  R_MIPS_REL32 = 3,
+  R_MIPS_32 = 2,                   // In Elf 64: alias R_MIPS_ADD
+  R_MIPS_REL32 = 3,                // In Elf 64: alias R_MIPS_REL
   R_MIPS_26 = 4,
   R_MIPS_HI16 = 5,
   R_MIPS_LO16 = 6,
-  R_MIPS_GPREL16 = 7,
+  R_MIPS_GPREL16 = 7,              // In Elf 64: alias R_MIPS_GPREL
   R_MIPS_LITERAL = 8,
-  R_MIPS_GOT16 = 9,
+  R_MIPS_GOT16 = 9,                // In Elf 64: alias R_MIPS_GOT
   R_MIPS_PC16 = 10,
-  R_MIPS_CALL16 = 11,
+  R_MIPS_CALL16 = 11,              // In Elf 64: alias R_MIPS_CALL
   R_MIPS_GPREL32 = 12,
   R_MIPS_UNUSED1 = 13,
   R_MIPS_UNUSED2 = 14,
@@ -69,48 +70,101 @@ enum
   R_MIPS_GOT_HI16 = 22,
   R_MIPS_GOT_LO16 = 23,
   R_MIPS_SUB = 24,
-  R_MIPS_INSERT_A = 25,		// Empty relocation
-  R_MIPS_INSERT_B = 26,		// Empty relocation
-  R_MIPS_DELETE = 27,		// Empty relocation
+  R_MIPS_INSERT_A = 25,
+  R_MIPS_INSERT_B = 26,
+  R_MIPS_DELETE = 27,
   R_MIPS_HIGHER = 28,
   R_MIPS_HIGHEST = 29,
   R_MIPS_CALL_HI16 = 30,
   R_MIPS_CALL_LO16 = 31,
   R_MIPS_SCN_DISP = 32,
-  R_MIPS_REL16 = 33,		// Empty relocation
-  R_MIPS_ADD_IMMEDIATE = 34,	// Empty relocation
-  R_MIPS_PJUMP = 35,		// Empty relocation
-  R_MIPS_RELGOT = 36,		// Empty relocation
+  R_MIPS_REL16 = 33,
+  R_MIPS_ADD_IMMEDIATE = 34,
+  R_MIPS_PJUMP = 35,
+  R_MIPS_RELGOT = 36,
   R_MIPS_JALR = 37,
+  // TLS relocations.
   R_MIPS_TLS_DTPMOD32 = 38,
   R_MIPS_TLS_DTPREL32 = 39,
-  R_MIPS_TLS_DTPMOD64 = 40,	// Empty relocation
-  R_MIPS_TLS_DTPREL64 = 41,	// Empty relocation
+  R_MIPS_TLS_DTPMOD64 = 40,
+  R_MIPS_TLS_DTPREL64 = 41,
   R_MIPS_TLS_GD = 42,
   R_MIPS_TLS_LDM = 43,
   R_MIPS_TLS_DTPREL_HI16 = 44,
   R_MIPS_TLS_DTPREL_LO16 = 45,
   R_MIPS_TLS_GOTTPREL = 46,
   R_MIPS_TLS_TPREL32 = 47,
-  R_MIPS_TLS_TPREL64 = 48,	// Empty relocation
+  R_MIPS_TLS_TPREL64 = 48,
   R_MIPS_TLS_TPREL_HI16 = 49,
   R_MIPS_TLS_TPREL_LO16 = 50,
   R_MIPS_GLOB_DAT = 51,
+  // These relocs are used for the mips16.
   R_MIPS16_26 = 100,
   R_MIPS16_GPREL = 101,
   R_MIPS16_GOT16 = 102,
   R_MIPS16_CALL16 = 103,
   R_MIPS16_HI16 = 104,
   R_MIPS16_LO16 = 105,
+  R_MIPS16_TLS_GD = 106,
+  R_MIPS16_TLS_LDM = 107,
+  R_MIPS16_TLS_DTPREL_HI16 = 108,
+  R_MIPS16_TLS_DTPREL_LO16 = 109,
+  R_MIPS16_TLS_GOTTPREL = 110,
+  R_MIPS16_TLS_TPREL_HI16 = 111,
+  R_MIPS16_TLS_TPREL_LO16 = 112,
+
   R_MIPS_COPY = 126,
   R_MIPS_JUMP_SLOT = 127,
+
+  // These relocations are specific to microMIPS.
+  R_MICROMIPS_26_S1 = 133,
+  R_MICROMIPS_HI16 = 134,
+  R_MICROMIPS_LO16 = 135,
+  R_MICROMIPS_GPREL16 = 136,       // In Elf 64: alias R_MICROMIPS_GPREL
+  R_MICROMIPS_LITERAL = 137,
+  R_MICROMIPS_GOT16 = 138,         // In Elf 64: alias R_MICROMIPS_GOT
+  R_MICROMIPS_PC7_S1 = 139,
+  R_MICROMIPS_PC10_S1 = 140,
+  R_MICROMIPS_PC16_S1 = 141,
+  R_MICROMIPS_CALL16 = 142,        // In Elf 64: alias R_MICROMIPS_CALL
+  R_MICROMIPS_GOT_DISP = 145,
+  R_MICROMIPS_GOT_PAGE = 146,
+  R_MICROMIPS_GOT_OFST = 147,
+  R_MICROMIPS_GOT_HI16 = 148,
+  R_MICROMIPS_GOT_LO16 = 149,
+  R_MICROMIPS_SUB = 150,
+  R_MICROMIPS_HIGHER = 151,
+  R_MICROMIPS_HIGHEST = 152,
+  R_MICROMIPS_CALL_HI16 = 153,
+  R_MICROMIPS_CALL_LO16 = 154,
+  R_MICROMIPS_SCN_DISP = 155,
+  R_MICROMIPS_JALR = 156,
+  R_MICROMIPS_HI0_LO16 = 157,
+  // TLS relocations.
+  R_MICROMIPS_TLS_GD = 162,
+  R_MICROMIPS_TLS_LDM = 163,
+  R_MICROMIPS_TLS_DTPREL_HI16 = 164,
+  R_MICROMIPS_TLS_DTPREL_LO16 = 165,
+  R_MICROMIPS_TLS_GOTTPREL = 166,
+  R_MICROMIPS_TLS_TPREL_HI16 = 169,
+  R_MICROMIPS_TLS_TPREL_LO16 = 170,
+  // microMIPS GP- and PC-relative relocations.
+  R_MICROMIPS_GPREL7_S2 = 172,
+  R_MICROMIPS_PC23_S2 = 173,
+
+  // This was a GNU extension used by embedded-PIC.  It was co-opted by
+  // mips-linux for exception-handling data.  GCC stopped using it in
+  // May, 2004, then started using it again for compact unwind tables.
   R_MIPS_PC32 = 248,
+  R_MIPS_EH = 249,
+  // This relocation is used internally by gas.
   R_MIPS_GNU_REL16_S2 = 250,
+  // These are GNU extensions to enable C++ vtable garbage collection.
   R_MIPS_GNU_VTINHERIT = 253,
   R_MIPS_GNU_VTENTRY = 254
 };
 
-// Processor specific flags for the ELF header e_flags field.  */
+// Processor specific flags for the ELF header e_flags field.
 enum
 {
   // At least one .noreorder directive appears in the source.
@@ -235,6 +289,10 @@ enum
   // Note that one of the MIPS16 bits overlaps with STO_MIPS_PIC.
   STO_MIPS_ISA = 0xc0,
 
+  // The mask spanning the rest of MIPS psABI flags.  At most one is expected
+  // to be set except for STO_MIPS16.
+  STO_MIPS_FLAGS = ~(STO_MIPS_ISA | 0x3),
+
   // The MIPS psABI was updated in 2008 with support for PLTs and copy
   // relocs.  There are therefore two types of nonzero SHN_UNDEF functions:
   // PLT entries and traditional MIPS lazy binding stubs.  We mark the former
@@ -262,6 +320,57 @@ enum
   DTP_OFFSET = 0x8000
 };
 
+
+bool
+elf_st_is_mips16(unsigned char st_other)
+{ return (st_other & elfcpp::STO_MIPS16) == elfcpp::STO_MIPS16; }
+
+bool
+elf_st_is_micromips(unsigned char st_other)
+{ return (st_other & elfcpp::STO_MIPS_ISA) == elfcpp::STO_MICROMIPS; }
+
+// Whether the ABI is N32.
+bool
+abi_n32(elfcpp::Elf_Word e_flags)
+{ return (e_flags & elfcpp::EF_MIPS_ABI2) != 0; }
+
+// Whether the ABI is N64.
+bool
+abi_64(unsigned char ei_class)
+{ return ei_class == elfcpp::ELFCLASS64; }
+
+// Whether the file has microMIPS code.
+bool
+is_micromips(elfcpp::Elf_Word e_flags)
+{ return (e_flags & elfcpp::EF_MIPS_ARCH_ASE_MICROMIPS) != 0; }
+
+// Values which may appear in the kind field of an Elf_Options structure.
+enum
+{
+  // Undefined.
+  ODK_NULL = 0,
+  // Register usage and GP value.
+  ODK_REGINFO = 1,
+  // Exception processing information.
+  ODK_EXCEPTIONS = 2,
+  // Section padding information.
+  ODK_PAD = 3,
+  // Hardware workarounds performed.
+  ODK_HWPATCH = 4,
+  // Fill value used by the linker.
+  ODK_FILL = 5,
+  // Reserved space for desktop tools.
+  ODK_TAGS = 6,
+  // Hardware workarounds, AND bits when merging.
+  ODK_HWAND = 7,
+  // Hardware workarounds, OR bits when merging.
+  ODK_HWOR = 8,
+  // GP group to use for text/data sections.
+  ODK_GP_GROUP = 9,
+  // ID information.
+  ODK_IDENT = 10
+};
+
 } // End namespace elfcpp.
 
 #endif // !defined(ELFCPP_MIPS_H)
diff --git a/gold/ChangeLog b/gold/ChangeLog
index a978b8a..37d2686 100644
--- a/gold/ChangeLog
+++ b/gold/ChangeLog
@@ -1,5 +1,15 @@
 2014-01-30  Sasa Stankovic  <Sasa.Stankovic@imgtec.com>
 
+	* mips.cc: New file.
+	* Makefile.am (TARGETSOURCES): Add mips.cc
+	(ALL_TARGETOBJS): Add mips.$(OBJEXT)
+	* configure.tgt: Add entries for mips*.
+	* configure.ac: Likewise.
+	* Makefile.in: Regenerate.
+	* configure: Likewise.
+
+2014-01-30  Sasa Stankovic  <Sasa.Stankovic@imgtec.com>
+
 	* symtab.cc (Symbol_table::sized_write_globals): Allow a target to
 	adjust dynamic symbol value.
 	* target.h (Target::adjust_dyn_symbol): New function.
diff --git a/gold/Makefile.am b/gold/Makefile.am
index 42704ce..0f85377 100644
--- a/gold/Makefile.am
+++ b/gold/Makefile.am
@@ -164,11 +164,12 @@ DEFFILES = arm-reloc.def
 EXTRA_DIST = yyscript.c yyscript.h
 
 TARGETSOURCES = \
-	i386.cc x86_64.cc sparc.cc powerpc.cc arm.cc arm-reloc-property.cc tilegx.cc
+	i386.cc x86_64.cc sparc.cc powerpc.cc arm.cc arm-reloc-property.cc tilegx.cc \
+	mips.cc
 
 ALL_TARGETOBJS = \
 	i386.$(OBJEXT) x86_64.$(OBJEXT) sparc.$(OBJEXT) powerpc.$(OBJEXT) \
-	arm.$(OBJEXT) arm-reloc-property.$(OBJEXT) tilegx.$(OBJEXT)
+	arm.$(OBJEXT) arm-reloc-property.$(OBJEXT) tilegx.$(OBJEXT) mips.$(OBJEXT)
 
 libgold_a_SOURCES = $(CCFILES) $(HFILES) $(YFILES) $(DEFFILES)
 libgold_a_LIBADD = $(LIBOBJS)
diff --git a/gold/Makefile.in b/gold/Makefile.in
index 661613e..d035919 100644
--- a/gold/Makefile.in
+++ b/gold/Makefile.in
@@ -533,11 +533,12 @@ YFILES = \
 DEFFILES = arm-reloc.def
 EXTRA_DIST = yyscript.c yyscript.h
 TARGETSOURCES = \
-	i386.cc x86_64.cc sparc.cc powerpc.cc arm.cc arm-reloc-property.cc tilegx.cc
+	i386.cc x86_64.cc sparc.cc powerpc.cc arm.cc arm-reloc-property.cc tilegx.cc \
+	mips.cc
 
 ALL_TARGETOBJS = \
 	i386.$(OBJEXT) x86_64.$(OBJEXT) sparc.$(OBJEXT) powerpc.$(OBJEXT) \
-	arm.$(OBJEXT) arm-reloc-property.$(OBJEXT) tilegx.$(OBJEXT)
+	arm.$(OBJEXT) arm-reloc-property.$(OBJEXT) tilegx.$(OBJEXT) mips.$(OBJEXT)
 
 libgold_a_SOURCES = $(CCFILES) $(HFILES) $(YFILES) $(DEFFILES)
 libgold_a_LIBADD = $(LIBOBJS)
diff --git a/gold/configure.ac b/gold/configure.ac
index b2741cf..87a4ecf 100644
--- a/gold/configure.ac
+++ b/gold/configure.ac
@@ -206,6 +206,7 @@ for targ in $target $canon_targets; do
 	AM_CONDITIONAL(DEFAULT_TARGET_SPARC, test "$targ_obj" = "sparc")
 	AM_CONDITIONAL(DEFAULT_TARGET_X86_64, test "$targ_obj" = "x86_64")
 	AM_CONDITIONAL(DEFAULT_TARGET_TILEGX, test "$targ_obj" = "tilegx")
+        AM_CONDITIONAL(DEFAULT_TARGET_MIPS, test "$targ_obj" = "mips")
 	DEFAULT_TARGET=${targ_obj}
 	AC_SUBST(DEFAULT_TARGET)
       fi
diff --git a/gold/configure.tgt b/gold/configure.tgt
index d61647e..8b816fc 100644
--- a/gold/configure.tgt
+++ b/gold/configure.tgt
@@ -144,6 +144,20 @@ arm*-*-*)
  targ_big_endian=false
  targ_extra_big_endian=true
  ;;
+mips*-*-*)
+ targ_obj=mips
+ targ_machine=EM_MIPS
+ targ_size=32
+ targ_big_endian=true
+ targ_extra_big_endian=false
+ ;;
+mips*el*-*-*|mips*le*-*-*)
+ targ_obj=mips
+ targ_machine=EM_MIPS_RS3_LE
+ targ_size=32
+ targ_big_endian=false
+ targ_extra_big_endian=true
+ ;;
 *)
   targ_obj=UNKNOWN
   ;;

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