Add PIC and TLS support to the ARC target.

bfd/ChangeLog:
	* arc-plt.def: New file.
	* arc-plt.h: Likewise.
	* elf32-arc.c (elf_arc_abs_plt0_entry, elf_arc_abs_pltn_entry,
		       elf_arcV2_abs_plt0_entry, elf_arcV2_abs_pltn_entry,
		       elf_arc_pic_plt0_entry, elf_arc_pic_pltn_entry,
		       elf_arcV2_pic_plt0_entry, elf_arcV2_pic_pltn_entry): Remove.
	(name_for_global_symbol): Added.
	(ADD_RELA): Helper to create dynamic relocs.
	(new_got_entry_to_list): Create a new got entry in linked list.
	(symbol_has_entry_of_type): Search for specific type of entry in
	list.
	(is_reloc_for_GOT): return FALSE for any TLS related relocs.
	(is_reloc_for_TLS, arc_elf_set_private_flags)
	(arc_elf_print_private_bfd_data, arc_elf_copy_private_bfd_data)
	(arc_elf_merge_private_bfd_data): New functions.
	(debug_arc_reloc): Cleaned debug info printing.
	(PDATA reloc): Changed not to perform address alignment.
	(reverse_me): Added. Fix for ARC_32 relocs.
	(arc_do_relocation): Return bfd_reloc_of when no relocation should
	occur.
	(arc_get_local_got_ents): Renamed from arc_get_local_got_offsets.
	Changed function to access an array of list of GOT entries instead
	of just an array of offsets.
	(elf_arc_relocate_section): Added support for PIC and TLS related relocations.
	(elf_arc_check_relocs): Likewise.
	(elf_arc_adjust_dynamic_symbol, elf_arc_finish_dynamic_symbol,
	(elf_arc_finish_dynamic_sections): Likewise
	(arc_create_dynamic_sections): Modified conditions to create
	dynamic sections.
	(ADD_SYMBOL_REF_SEC_AND_RELOC): New macro.
	(plt_do_relocs_for_symbol, relocate_plt_for_symbol)
	(relocate_plt_for_entry): Changed to support new way to define PLT
	related code.
	(add_symbol_to_plt): Likewise.
	(arc_elf_link_hash_table_create): New function.

include/ChangeLog:
	* elf/arc-reloc.def (ARC_32, ARC_GOTPC, ARC_TLS_GD_GOT)
	(ARC_TLS_IE_GOT, ARC_TLS_DTPOFF, ARC_TLS_DTPOFF_S9, ARC_TLS_LE_S9)
	(ARC_TLS_LE_32): Fixed formula.
	(ARC_TLS_GD_LD): Use new special function.
	* opcode/arc-func.h: Changed all the replacement
	functions to clear the patching bits before doing an or it with the value
	argument.

1 files changed, 196 insertions, 0 deletions

diff --git a/bfd/arc-plt.h b/bfd/arc-plt.h
new file mode 100644
index 0000000..fec461d
--- /dev/null
+++ b/bfd/arc-plt.h
@@ -0,0 +1,196 @@
+/* ARC-specific header file for PLT support.
+   Copyright (C) 2016 Free Software Foundation, Inc.
+   Contributed by Cupertino Miranda (cmiranda@synopsys.com).
+
+   This file is part of BFD, the Binary File Descriptor library.
+
+   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 ARC_PLT_H
+#define ARC_PLT_H
+
+#include <stdint.h>
+
+/* Instructions appear in memory as a sequence of half-words (16 bit);
+   individual half-words are represented on the target in target byte order.
+   We use 'unsigned short' on the host to represent the PLT templates,
+   and translate to target byte order as we copy to the target.  */
+typedef uint16_t insn_hword;
+
+enum plt_reloc_symbol
+{
+  LAST_RELOC = 0,
+
+  SGOT = 1,
+
+  RELATIVE = (1 << 8),
+  RELATIVE_INSN_32 = (1 << 9),
+  RELATIVE_INSN_24 = (1 << 10),
+
+  MIDDLE_ENDIAN = (1 << 11)
+};
+
+#define IS_RELATIVE(S)      ((S & (RELATIVE | RELATIVE_INSN_24 | RELATIVE_INSN_32)) != 0)
+#define IS_INSN_32(S)       ((S & RELATIVE_INSN_32) != 0)
+#define IS_INSN_24(S)       ((S & RELATIVE_INSN_24) != 0)
+#define IS_MIDDLE_ENDIAN(S) ((S & MIDDLE_ENDIAN) != 0)
+#define SYM_ONLY(S)         (S & 0xFF)
+
+struct plt_reloc
+{
+  bfd_vma	  offset;
+  bfd_vma	  size;
+  bfd_vma	  mask;
+  enum plt_reloc_symbol symbol;
+  bfd_vma	  addend;
+};
+
+
+#define PLT_TYPE_START(NAME) NAME,
+#define PLT_TYPE_END(NAME)
+#define PLT_ENTRY(...)
+#define PLT_ELEM(...)
+#define ENTRY_RELOC(...)
+#define ELEM_RELOC(...)
+
+enum plt_types_enum
+{
+  PLT_START = -1,
+#include "arc-plt.def"
+  PLT_MAX
+};
+
+#undef PLT_TYPE_START
+#undef PLT_TYPE_END
+#undef PLT_ENTRY
+#undef PLT_ELEM
+#undef ENTRY_RELOC
+#undef ELEM_RELOC
+
+typedef insn_hword insn_hword_array[];
+
+struct plt_version_t
+{
+  const insn_hword_array *entry;
+  const bfd_vma		  entry_size;
+  const insn_hword_array *elem;
+  const bfd_vma		  elem_size;
+
+  const struct plt_reloc *entry_relocs;
+  const struct plt_reloc *elem_relocs;
+};
+
+#define PLT_TYPE_START(NAME) \
+  const insn_hword NAME##_plt_entry[] = {
+#define PLT_TYPE_END(NAME) };
+#define PLT_ENTRY(...) __VA_ARGS__,
+#define PLT_ELEM(...)
+#define ENTRY_RELOC(...)
+#define ELEM_RELOC(...)
+
+#include "arc-plt.def"
+
+#undef PLT_TYPE_START
+#undef PLT_TYPE_END
+#undef PLT_ENTRY
+#undef PLT_ELEM
+#undef ENTRY_RELOC
+#undef ELEM_RELOC
+
+#define PLT_TYPE_START(NAME) \
+  const struct plt_reloc NAME##_plt_entry_relocs[] = {
+#define PLT_TYPE_END(NAME) \
+    {0, 0, 0, LAST_RELOC, 0} \
+  };
+#define PLT_ENTRY(...) 
+#define PLT_ELEM(...)
+#define ENTRY_RELOC(...) { __VA_ARGS__ },
+#define ELEM_RELOC(...)
+
+#include "arc-plt.def"
+
+#undef PLT_TYPE_START
+#undef PLT_TYPE_END
+#undef PLT_ENTRY
+#undef PLT_ELEM
+#undef ENTRY_RELOC
+#undef ELEM_RELOC
+
+
+#define PLT_TYPE_START(NAME) \
+  const insn_hword NAME##_plt_elem[] = {
+#define PLT_TYPE_END(NAME) };
+#define PLT_ENTRY(...)
+#define PLT_ELEM(...) __VA_ARGS__,
+#define ENTRY_RELOC(...)
+#define ELEM_RELOC(...)
+
+#include "arc-plt.def"
+
+#undef PLT_TYPE_START
+#undef PLT_TYPE_END
+#undef PLT_ENTRY
+#undef PLT_ELEM
+#undef ENTRY_RELOC
+#undef ELEM_RELOC
+
+#define PLT_TYPE_START(NAME) \
+  const struct plt_reloc NAME##_plt_elem_relocs[] = {
+#define PLT_TYPE_END(NAME) \
+    {0, 0, 0, LAST_RELOC, 0} \
+  };
+#define PLT_ENTRY(...) 
+#define PLT_ELEM(...)
+#define ENTRY_RELOC(...)
+#define ELEM_RELOC(...) { __VA_ARGS__ },
+
+#include "arc-plt.def"
+
+#undef PLT_TYPE_START
+#undef PLT_TYPE_END
+#undef PLT_ENTRY
+#undef PLT_ELEM
+#undef ENTRY_RELOC
+#undef ELEM_RELOC
+
+
+#define PLT_TYPE_START(NAME) \
+  { \
+    .entry = &NAME##_plt_entry, \
+    .entry_size = sizeof (NAME##_plt_entry), \
+    .elem = &NAME##_plt_elem, \
+    .elem_size = sizeof (NAME##_plt_elem),  \
+    .entry_relocs = NAME##_plt_entry_relocs, \
+    .elem_relocs = NAME##_plt_elem_relocs
+#define PLT_TYPE_END(NAME) },
+#define PLT_ENTRY(...)
+#define PLT_ELEM(...)
+#define ENTRY_RELOC(...)
+#define ELEM_RELOC(...)
+struct plt_version_t plt_versions[PLT_MAX] = {
+
+#include "arc-plt.def"
+
+};
+#undef PLT_TYPE_START
+#undef PLT_TYPE_END
+#undef PLT_ENTRY
+#undef PLT_ELEM
+#undef ENTRY_RELOC
+#undef ELEM_RELOC
+
+
+#endif /* ARC_PLT_H */