gold aarch64 patch to enable linking hello_wolrd.

elfcpp/ChangeLog:
2014-08-08  Han Shen  <shenhan@google.com>

	* aarch64.h (withdrawn): Replaced with R_AARCH64_withdrawn.

2014-08-08  Jing Yu  <jingyu@google.com>
	    Han Shen  <shenhan@google.com>

	* Makefile.am (HFILES): Add aarch64-reloc-property.h.
	(DEFFILES): add aarch64-reloc.def.
	(TARGETSOURCES): Add aarch64-reloc-property.cc.
	(ALL_TARGETOBJS): Add aarch64-reloc-property.$(OBJEXT).
	* Makefile.in: Regenerate.
	* aarch64-reloc-property.cc: New file.
	* aarch64-reloc-property.h: New file.
	* aarch64-reloc.def: New file.
	* aarch64.cc: Include aarch64-reloc-property.h. Replace spaces
	with tab to make the format consistent.
	(Output_data_got_aarch64::symbol_table_): New method.
	(Target_aarch64::do_plt_address_for_global): New method.
	(Target_aarch64::do_plt_address_for_local): New method.
	(Target_aarch64::do_select_as_default_target): New method.
	(Target_aarch64::do_make_data_plt): New method.
	(Target_aarch64::make_data_plt): New method.
	(Output_data_plt_aarch64::has_irelative_section): New method.
	(Output_data_plt_aarch64::address_for_global): New method.
	(Output_data_plt_aarch64::address_for_local): New method.
	(Output_data_plt_aarch64::irelative_rel_): New parameter.
	(Output_data_plt_aarch64::add_entry): Implement contents.
	(Output_data_plt_aarch64::set_final_data_size): Fix typo.
	(Output_data_plt_aarch64::do_write): Remove useless got_base. Set
	the got_pov entry to plt0.
	(Output_data_plt_aarch64_standard::do_fill_first_plt_entry):
	Implement contents.
	(Output_data_plt_aarch64_standard::do_fill_plt_entry): Implement.
	(AArch64_howto): New struct.
	(aarch64_howto[]): New static const array.
	(AArch64_relocate_functions): New class.
	(Target_aarch64::Scan::get_reference_flags): Remove method.
	(Target_aarch64::Scan::local): Implement to support a few relocations.
	(Target_aarch64::Scan::global): Implement to support a few relocations.
	(Target_aarch64::make_plt_section): Implement contents.
	(Target_aarch64::make_plt_entry): Implement contents.
	(Target_aarch64::do_finalize_sections): Implement contents.
	(Target_aarch64::Relocate::relocate): Implement a few relocations.
	(Target_aarch64::relocate_section): Implement contents.

1 files changed, 245 insertions, 0 deletions

diff --git a/gold/aarch64-reloc-property.h b/gold/aarch64-reloc-property.h
new file mode 100644
index 0000000..d8d1301
--- /dev/null
+++ b/gold/aarch64-reloc-property.h
@@ -0,0 +1,245 @@
+// aarch64-reloc-property.h -- AArch64 relocation properties   -*- C++ -*-
+
+// Copyright (C) 2014 Free Software Foundation, Inc.
+// Written by Han Shen <shenhan@google.com> and Jing Yu <jingyu@google.com>.
+
+// This file is part of gold.
+
+// This program is free software; you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation; either version 3 of the License, or
+// (at your option) any later version.
+
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+
+// You should have received a copy of the GNU General Public License
+// along with this program; if not, write to the Free Software
+// Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
+// MA 02110-1301, USA.
+
+#ifndef GOLD_AARCH64_RELOC_PROPERTY_H
+#define GOLD_AARCH64_RELOC_PROPERTY_H
+
+#include<vector>
+#include<string>
+
+#include"aarch64.h"
+
+namespace gold
+{
+// The AArch64_reloc_property class is to store information about a particular
+// relocation code.
+
+class AArch64_reloc_property
+{
+ public:
+  // Types of relocation codes.
+  enum Reloc_type {
+    RT_NONE,		// No relocation type.
+    RT_STATIC,		// Relocations processed by static linkers.
+    RT_DYNAMIC,	// Relocations processed by dynamic linkers.
+  };
+
+  // Classes of relocation codes.
+  enum Reloc_class {
+    RC_NONE,		// No relocation class.
+    RC_DATA,		// Data relocation.
+    RC_AARCH64,		// Static AArch64 relocations
+    RC_CFLOW,		// Control flow
+    RC_TLS,		// Thread local storage
+    RC_DYNAMIC,		// Dynamic relocation
+  };
+
+  // Instructions that are associated with relocations.
+  enum Reloc_inst {
+    INST_DATA = 0,
+    INST_MOVW = 1,	// movz, movk, movn
+    INST_LD = 2,	// ld literal
+    INST_ADR = 3,	// adr
+    INST_ADRP = 4,	// adrp
+    INST_ADD = 5,	// add
+    INST_LDST = 6,	// ld/st
+    INST_TBZNZ = 7,	// tbz/tbnz
+    INST_CONDB = 8,	// B.cond
+    INST_B = 9,		// b  [25:0]
+    INST_CALL = 10,	// bl [25:0]
+    INST_NUM = 11,	// total number of entries in the table
+  };
+
+  // Types of bases of relative addressing relocation codes.
+  // enum Relative_address_base {
+  //   RAB_NONE,		// Relocation is not relative addressing
+  // };
+
+  typedef bool (*rvalue_checkup_func_p)(int64_t);
+  typedef uint64_t (*rvalue_bit_select_func)(uint64_t);
+
+  // Relocation code represented by this.
+  unsigned int
+  code() const
+  { return this->code_; }
+
+  // Name of the relocation code.
+  const std::string&
+  name() const
+  { return this->name_; }
+
+  // Type of relocation code.
+  Reloc_type
+  reloc_type() const
+  { return this->reloc_type_; }
+
+  // Class of relocation code.
+  Reloc_class
+  reloc_class() const
+  { return this->reloc_class_; }
+
+  // Whether this code is implemented in gold.
+  bool
+  is_implemented() const
+  { return this->is_implemented_; }
+
+  // If code is a group relocation code, return the group number, otherwise -1.
+  int
+  group_index() const
+  { return this->group_index_; }
+
+  // Return alignment of relocation.
+  size_t
+  align() const
+  { return this->align_; }
+
+  int
+  reference_flags() const
+  { return this->reference_flags_; }
+
+  // Instruction associated with this relocation.
+  Reloc_inst
+  reloc_inst() const
+  { return this->reloc_inst_; }
+
+  // Check overflow of x
+  bool checkup_x_value(int64_t x) const
+  { return this->rvalue_checkup_func_(x); }
+
+  // Return portions of x as is defined in aarch64-reloc.def.
+  uint64_t select_x_value(uint64_t x) const
+  { return this->rvalue_bit_select_func_(x); }
+
+ protected:
+  // These are protected.  We only allow AArch64_reloc_property_table to
+  // manage AArch64_reloc_property.
+  AArch64_reloc_property(unsigned int code, const char* name, Reloc_type rtype,
+			 Reloc_class rclass,
+			 bool is_implemented,
+			 int group_index,
+			 int reference_flags,
+			 Reloc_inst reloc_inst,
+			 rvalue_checkup_func_p rvalue_checkup_func,
+			 rvalue_bit_select_func rvalue_bit_select);
+
+  friend class AArch64_reloc_property_table;
+
+ private:
+  // Copying is not allowed.
+  AArch64_reloc_property(const AArch64_reloc_property&);
+  AArch64_reloc_property& operator=(const AArch64_reloc_property&);
+
+  // Relocation code.
+  const unsigned int code_;
+  // Relocation name.
+  const std::string name_;
+  // Type of relocation.
+  Reloc_type reloc_type_;
+  // Class of relocation.
+  Reloc_class reloc_class_;
+  // Group index (0, 1, or 2) if this is a group relocation or -1 otherwise.
+  int group_index_;
+  // Size of relocation.
+  size_t size_;
+  // Alignment of relocation.
+  size_t align_;
+  // Relative address base.
+  // Relative_address_base relative_address_base_;
+  // Whether this is deprecated.
+  bool is_deprecated_ : 1;
+  // Whether this is implemented in gold.
+  bool is_implemented_ : 1;
+  // Whether this checks overflow.
+  bool checks_overflow_ : 1;
+  const int reference_flags_;
+  // Instruction associated with relocation.
+  Reloc_inst reloc_inst_;
+  rvalue_checkup_func_p rvalue_checkup_func_;
+  rvalue_bit_select_func rvalue_bit_select_func_;
+};
+
+class AArch64_reloc_property_table
+{
+ public:
+  AArch64_reloc_property_table();
+
+  const AArch64_reloc_property*
+  get_reloc_property(unsigned int code) const
+  {
+    unsigned int idx = code_to_array_index(code);
+    return this->table_[idx];
+  }
+
+  // Like get_reloc_property but only return non-NULL if relocation code is
+  // static and implemented.
+  const AArch64_reloc_property*
+  get_implemented_static_reloc_property(unsigned int code) const
+  {
+    unsigned int idx = code_to_array_index(code);
+    const AArch64_reloc_property* arp = this->table_[idx];
+    return ((arp != NULL
+	     && (arp->reloc_type() == AArch64_reloc_property::RT_STATIC)
+	     && arp->is_implemented())
+	    ? arp
+	    : NULL);
+  }
+
+  // Return a string describing the relocation code that is not
+  // an implemented static reloc code.
+  std::string
+  reloc_name_in_error_message(unsigned int code);
+
+ private:
+  // Copying is not allowed.
+  AArch64_reloc_property_table(const AArch64_reloc_property_table&);
+  AArch64_reloc_property_table& operator=(const AArch64_reloc_property_table&);
+
+  // Map aarch64 rtypes into range(0,300) as following
+  //   256 ~ 313 -> 0 ~ 57
+  //   512 ~ 573 -> 128 ~ 189
+  int
+  code_to_array_index(unsigned int code) const
+  {
+    if (code == 0) return 0;
+    if (!((code >= elfcpp::R_AARCH64_ABS64 &&
+	   code <= elfcpp::R_AARCH64_LD64_GOTPAGE_LO15)
+	  || (code >= elfcpp::R_AARCH64_TLSGD_ADR_PREL21 &&
+	      code <= elfcpp::R_AARCH64_TLSLD_LDST128_DTPREL_LO12_NC)))
+      {
+	gold_error(_("Invalid/unrecognized reloc reloc %d."), code);
+      }
+    unsigned int rv = -1;
+    if (code & (1 << 9))
+      rv = 128 + code - 512;  // 512 - 573
+    else if (code & (1 << 8))
+      rv = code - 256;  // 256 - 313
+    gold_assert(rv <= Property_table_size);
+    return rv;
+  }
+
+  static const unsigned int Property_table_size = 300;
+  AArch64_reloc_property* table_[Property_table_size];
+};  // End of class AArch64_reloc_property_table
+
+} // End namespace gold.
+
+#endif // !defined(GOLD_AARCH64_RELOC_PROPERTY_H)