[Xtensa] add TLS support

[Bob Wilson]

This patch adds TLS support for Xtensa.  Committed on the trunk.  GCC support 
should follow soon....

2008-08-20  Bob Wilson  <bob.wilson@acm.org>

bfd/
         * elf-bfd.h (elf_object_id): Add XTENSA_ELF_TDATA.
         * elf32-xtensa.c (elf_howto_table): Add TLS relocations.
         (elf_xtensa_reloc_type_lookup): Likewise.
         (TCB_SIZE): Define.
         (elf_xtensa_link_hash_entry): New.
         (GOT_UNKNOWN, GOT_NORMAL, GOT_TLS_GD, GOT_TLS_IE, GOT_TLS_ANY): Define.
         (elf_xtensa_hash_entry): Define.
         (elf_xtensa_obj_tdata): New.
         (elf_xtensa_tdata): Define.
         (elf_xtensa_local_got_tls_type): Define.
         (elf_xtensa_local_tlsfunc_refcounts): Define.
         (is_xtensa_elf): Define.
         (elf_xtensa_mkobject): New.
         (elf_xtensa_link_hash_table): Add tlsbase field.
         (elf_xtensa_link_hash_newfunc): New.
         (elf_xtensa_link_hash_table_create): Use elf_xtensa_link_hash_newfunc.
         Create an entry for "_TLS_MODULE_BASE_" and save it in tlsbase field.
         (elf_xtensa_copy_indirect_symbol): New.
         (elf_xtensa_check_relocs): Rewrite to handle TLS relocations.
         (elf_xtensa_gc_sweep_hook): Likewise.
         (elf_xtensa_allocate_dynrelocs): Optimize away GOT entries for
         TLSDESC_FN relocations when an IE reference is seen.
         (elf_xtensa_allocate_local_got_size): Likewise.
         (elf_xtensa_always_size_sections): New.
         (dtpoff_base, tpoff): New.
         (elf_xtensa_do_reloc): Handle TLS relocations.
         (replace_tls_insn): New.
         (IS_XTENSA_TLS_RELOC): Define.
         (elf_xtensa_relocate_section): Handle TLS relocations.
         (get_indirect_call_dest_reg): New.
         (bfd_elf32_mkobject): Define.
         (elf_backend_always_size_sections): New.
         (elf_backend_copy_indirect_symbol): New.
         * reloc.c (BFD_RELOC_XTENSA_TLSDESC_FN, BFD_RELOC_XTENSA_TLSDESC_ARG)
         (BFD_RELOC_XTENSA_TLS_DTPOFF, BFD_RELOC_XTENSA_TLS_TPOFF)
         (BFD_RELOC_XTENSA_TLS_FUNC, BFD_RELOC_XTENSA_TLS_ARG)
         (BFD_RELOC_XTENSA_TLS_CALL): New.
         * bfd-in2.h: Regenerate.
         * libbfd.h: Regenerate.

gas/
         * config/tc-xtensa.c (O_tlsfunc, O_tlsarg, O_tlscall): Define.
         (O_tpoff, O_dtpoff): Define.
         (suffix_relocs): Add entries for TLS suffixes.
         (xtensa_elf_cons): Check for invalid use of TLS relocations.
         (map_operator_to_reloc): Add is_literal parameter and use it to
         control translating TLS instruction relocations to the corresponding
         literal relocations.
         (xg_valid_literal_expression): Allow TLS operators.
         (xg_build_to_insn): Copy TLS operators from pseudo-instruction
         operands to generated literals.
         (xg_assemble_literal): Handle TLS operators.  Update call to
         map_operator_to_reloc.
         (md_assemble): Handle CALLXn.TLS pseudo-instruction.
         (md_apply_fix): Handle TLS relocations.
         (emit_single_op): Handle TLS operators.
         (convert_frag_immed): Update call to map_operator_to_reloc.
         (vinsn_to_insnbuf): Emit relocations for TLS-related instructions.
         * config/xtensa-istack.h (tinsn_struct): Add tls_reloc field.
         * config/xtensa-relax.c (append_literal_op): Add src_op parameter
         to initialize the op_data field of the BuildOp.
         (build_transition): Use it here to record the source operand
         corresponding to a generated literal.
         * config/xtensa-relax.h (build_op): Comment op_data use for literals.

include/elf/
         * xtensa.h (R_XTENSA_TLSDESC_FN, R_XTENSA_TLSDESC_ARG)
         (R_XTENSA_TLS_DTPOFF, R_XTENSA_TLS_TPOFF, R_XTENSA_TLS_FUNC)
         (R_XTENSA_TLS_ARG, R_XTENSA_TLS_CALL): New.

ld/testsuite/
         * ld-xtensa/tlsbin.dd, ld-xtensa/tlsbin.rd, ld-xtensa/tlsbin.s,
         ld-xtensa/tlsbin.sd, ld-xtensa/tlsbin.td, ld-xtensa/tlslib.s,
         ld-xtensa/tlspic.dd, ld-xtensa/tlspic.rd, ld-xtensa/tlspic.sd,
         ld-xtensa/tlspic.td, ld-xtensa/tlspic1.s, ld-xtensa/tlspic2.s: New.
         * ld-xtensa/xtensa.exp: Run them.
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