384 lines
11 KiB
C
384 lines
11 KiB
C
/* TXVU-specific support for 32-bit ELF.
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Copyright (C) 1997, 1998 Free Software Foundation, Inc.
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This file is part of BFD, the Binary File Descriptor library.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
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#include "bfd.h"
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#include "sysdep.h"
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#include "libbfd.h"
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#include "elf-bfd.h"
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#include "elf/txvu.h"
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static reloc_howto_type *bfd_elf32_bfd_reloc_type_lookup
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PARAMS ((bfd *abfd, bfd_reloc_code_real_type code));
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static void txvu_info_to_howto_rel
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PARAMS ((bfd *, arelent *, Elf32_Internal_Rela *));
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static boolean txvu_elf_relocate_section
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PARAMS ((bfd *, struct bfd_link_info *, bfd *, asection *, bfd_byte *,
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Elf_Internal_Rela *, Elf_Internal_Sym *, asection **));
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/* Use RELA, not REL. REL incurs complications one would rather not
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deal with. */
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/*#define USE_REL*/
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static reloc_howto_type txvu_elf_howto_table[] =
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{
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/* This reloc does nothing. */
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HOWTO (R_TXVU_NONE, /* type */
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0, /* rightshift */
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2, /* size (0 = byte, 1 = short, 2 = long) */
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32, /* bitsize */
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false, /* pc_relative */
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0, /* bitpos */
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complain_overflow_bitfield, /* complain_on_overflow */
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bfd_elf_generic_reloc, /* special_function */
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"R_TXVU_NONE", /* name */
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false, /* partial_inplace */
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0, /* src_mask */
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0, /* dst_mask */
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false), /* pcrel_offset */
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/* A PC Relative 11-bit relocation, shifted by 3.
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Fortunately, the lower instruction has the lower address in the 64 bit
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pair. Thus we can treat the address of the instruction as a whole
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as the address of the lower instruction (the one with the branch),
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and pretend the instruction size is 32 bits.
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Otherwise, we'd have to either perform the relocation on all 64 bits
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(since the pc relative address is the start of the pair), or set the
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address of the reloc as the address of the lower instruction and do what
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is done for R_M32R_10_PCREL which is to mask off the lower 3 bits of the
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pc before performing the reloc. */
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HOWTO (R_TXVU_11_PCREL, /* type */
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3, /* rightshift */
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2, /* size (0 = byte, 1 = short, 2 = long) */
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11, /* bitsize */
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true, /* pc_relative */
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0, /* bitpos */
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complain_overflow_signed, /* complain_on_overflow */
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bfd_elf_generic_reloc, /* special_function */
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"R_TXVU_11_PCREL", /* name */
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false, /* partial_inplace */
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0x1ff, /* src_mask */
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0x1ff, /* dst_mask */
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true), /* pcrel_offset */
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};
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/* Map BFD reloc types to TXVU ELF reloc types. */
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struct txvu_reloc_map
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{
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unsigned char bfd_reloc_val;
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unsigned char elf_reloc_val;
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};
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static const struct txvu_reloc_map txvu_reloc_map[] =
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{
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{ BFD_RELOC_NONE, R_TXVU_NONE },
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{ BFD_RELOC_TXVU_11_PCREL, R_TXVU_11_PCREL }
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};
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static reloc_howto_type *
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bfd_elf32_bfd_reloc_type_lookup (abfd, code)
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bfd *abfd;
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bfd_reloc_code_real_type code;
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{
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unsigned int i;
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for (i = 0;
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i < sizeof (txvu_reloc_map) / sizeof (struct txvu_reloc_map);
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i++)
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{
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if (txvu_reloc_map[i].bfd_reloc_val == code)
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return &txvu_elf_howto_table[txvu_reloc_map[i].elf_reloc_val];
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}
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return NULL;
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}
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/* Set the howto pointer for an TXVU ELF reloc. */
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static void
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txvu_info_to_howto_rel (abfd, cache_ptr, dst)
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bfd *abfd;
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arelent *cache_ptr;
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Elf32_Internal_Rela *dst;
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{
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unsigned int r_type = ELF32_R_TYPE (dst->r_info);
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BFD_ASSERT (r_type < (unsigned int) R_TXVU_max);
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cache_ptr->howto = &txvu_elf_howto_table[r_type];
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}
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/* Relocate a TXVU ELF section.
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The RELOCATE_SECTION function is called by the new ELF backend linker
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to handle the relocations for a section.
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The relocs are always passed as Rela structures; if the section
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actually uses Rel structures, the r_addend field will always be
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zero.
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This function is responsible for adjust the section contents as
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necessary, and (if using Rela relocs and generating a
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relocateable output file) adjusting the reloc addend as
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necessary.
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This function does not have to worry about setting the reloc
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address or the reloc symbol index.
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LOCAL_SYMS is a pointer to the swapped in local symbols.
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LOCAL_SECTIONS is an array giving the section in the input file
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corresponding to the st_shndx field of each local symbol.
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The global hash table entry for the global symbols can be found
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via elf_sym_hashes (input_bfd).
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When generating relocateable output, this function must handle
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STB_LOCAL/STT_SECTION symbols specially. The output symbol is
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going to be the section symbol corresponding to the output
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section, which means that the addend must be adjusted
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accordingly. */
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static boolean
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txvu_elf_relocate_section (output_bfd, info, input_bfd, input_section,
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contents, relocs, local_syms, local_sections)
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bfd *output_bfd;
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struct bfd_link_info *info;
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bfd *input_bfd;
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asection *input_section;
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bfd_byte *contents;
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Elf_Internal_Rela *relocs;
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Elf_Internal_Sym *local_syms;
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asection **local_sections;
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{
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Elf_Internal_Shdr *symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr;
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struct elf_link_hash_entry **sym_hashes = elf_sym_hashes (input_bfd);
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Elf_Internal_Rela *rel, *relend;
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bfd *dynobj = elf_hash_table (info)->dynobj;
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/* Assume success. */
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boolean ret = true;
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rel = relocs;
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relend = relocs + input_section->reloc_count;
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for (; rel < relend; rel++)
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{
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int r_type;
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reloc_howto_type *howto;
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unsigned long r_symndx;
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/* We can't modify r_addend here as elf_link_input_bfd has an assert to
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ensure it's zero (we use REL relocs, not RELA). Therefore this
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should be assigning zero to `addend', but for clarity we use
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`r_addend'. */
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/* ??? The previous comment is old, revisit and delete. */
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bfd_vma addend = rel->r_addend;
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bfd_vma offset = rel->r_offset;
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struct elf_link_hash_entry *h;
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Elf_Internal_Sym *sym;
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asection *sec;
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const char *sym_name;
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bfd_reloc_status_type r;
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const char *errmsg = NULL;
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r_type = ELF32_R_TYPE (rel->r_info);
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if (r_type < 0 || r_type >= (int) R_TXVU_max)
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{
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(*_bfd_error_handler) ("%s: unknown relocation type %d",
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bfd_get_filename (input_bfd),
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(int) r_type);
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bfd_set_error (bfd_error_bad_value);
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ret = false;
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continue;
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}
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howto = txvu_elf_howto_table + r_type;
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r_symndx = ELF32_R_SYM (rel->r_info);
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if (info->relocateable)
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{
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/* This is a relocateable link. We don't have to change
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anything, unless the reloc is against a section symbol,
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in which case we have to adjust according to where the
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section symbol winds up in the output section. */
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sec = NULL;
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if (r_symndx >= symtab_hdr->sh_info)
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{
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/* External symbol. */
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continue;
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}
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/* Local symbol. */
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sym = local_syms + r_symndx;
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sym_name = "<local symbol>";
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/* STT_SECTION: symbol is associated with a section. */
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if (ELF_ST_TYPE (sym->st_info) != STT_SECTION)
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{
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/* Symbol isn't associated with a section. Nothing to do. */
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continue;
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}
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sec = local_sections[r_symndx];
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addend += sec->output_offset + sym->st_value;
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rel->r_addend = addend;
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/* Addends are stored with relocs. We're done. */
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continue;
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}
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else
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{
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bfd_vma relocation;
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/* This is a final link. */
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h = NULL;
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sym = NULL;
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sec = NULL;
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if (r_symndx < symtab_hdr->sh_info)
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{
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/* Local symbol. */
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sym = local_syms + r_symndx;
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sec = local_sections[r_symndx];
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sym_name = "<local symbol>";
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relocation = (sec->output_section->vma
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+ sec->output_offset
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+ sym->st_value);
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}
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else
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{
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/* External symbol. */
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h = sym_hashes[r_symndx - symtab_hdr->sh_info];
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while (h->root.type == bfd_link_hash_indirect
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|| h->root.type == bfd_link_hash_warning)
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h = (struct elf_link_hash_entry *) h->root.u.i.link;
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sym_name = h->root.root.string;
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if (h->root.type == bfd_link_hash_defined
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|| h->root.type == bfd_link_hash_defweak)
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{
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sec = h->root.u.def.section;
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if (sec->output_section == NULL)
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relocation = 0;
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else
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relocation = (h->root.u.def.value
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+ sec->output_section->vma
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+ sec->output_offset);
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}
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else if (h->root.type == bfd_link_hash_undefweak)
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relocation = 0;
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else
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{
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if (! ((*info->callbacks->undefined_symbol)
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(info, h->root.root.string, input_bfd,
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input_section, offset)))
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return false;
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relocation = 0;
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}
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}
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/* Sanity check the address. */
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if (offset > input_section->_raw_size)
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{
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r = bfd_reloc_outofrange;
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goto check_reloc;
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}
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switch ((int) r_type)
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{
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/* insert reloc handling code here */
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default :
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r = _bfd_final_link_relocate (howto, input_bfd, input_section,
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contents, offset,
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relocation, addend);
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break;
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}
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}
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check_reloc:
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if (r != bfd_reloc_ok)
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{
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/* FIXME: This should be generic enough to go in a utility. */
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const char *name;
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if (h != NULL)
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name = h->root.root.string;
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else
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{
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name = (bfd_elf_string_from_elf_section
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(input_bfd, symtab_hdr->sh_link, sym->st_name));
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if (name == NULL || *name == '\0')
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name = bfd_section_name (input_bfd, sec);
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}
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if (errmsg != NULL)
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goto common_error;
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switch (r)
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{
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case bfd_reloc_overflow:
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if (! ((*info->callbacks->reloc_overflow)
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(info, name, howto->name, (bfd_vma) 0,
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input_bfd, input_section, offset)))
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return false;
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break;
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case bfd_reloc_undefined:
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if (! ((*info->callbacks->undefined_symbol)
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(info, name, input_bfd, input_section,
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offset)))
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return false;
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break;
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case bfd_reloc_outofrange:
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errmsg = "internal error: out of range error";
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goto common_error;
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case bfd_reloc_notsupported:
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errmsg = "internal error: unsupported relocation error";
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goto common_error;
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case bfd_reloc_dangerous:
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errmsg = "internal error: dangerous error";
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goto common_error;
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default:
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errmsg = "internal error: unknown error";
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/* fall through */
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common_error:
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if (!((*info->callbacks->warning)
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(info, errmsg, name, input_bfd, input_section,
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offset)))
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return false;
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break;
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}
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}
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}
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return ret;
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}
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#define ELF_ARCH bfd_arch_txvu
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#define ELF_MACHINE_CODE EM_CYGNUS_TXVU
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#define ELF_MAXPAGESIZE 0x1000
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#define TARGET_BIG_SYM bfd_elf32_txvu_vec
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#define TARGET_BIG_NAME "elf32-txvu"
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#define elf_info_to_howto txvu_info_to_howto_rel
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#define elf_backend_relocate_section txvu_elf_relocate_section
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#include "elf32-target.h"
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