| 1 | /* BFD ECOFF object file private structure. | 
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| 2 | Copyright 1993, 1994, 1995, 1996, 1999, 2001, 2002 | 
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| 3 | Free Software Foundation, Inc. | 
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| 4 | Written by Ian Lance Taylor, Cygnus Support. | 
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| 5 |  | 
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| 6 | This file is part of BFD, the Binary File Descriptor library. | 
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| 7 |  | 
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| 8 | This program is free software; you can redistribute it and/or modify | 
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| 9 | it under the terms of the GNU General Public License as published by | 
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| 10 | the Free Software Foundation; either version 2 of the License, or | 
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| 11 | (at your option) any later version. | 
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| 12 |  | 
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| 13 | This program is distributed in the hope that it will be useful, | 
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| 14 | but WITHOUT ANY WARRANTY; without even the implied warranty of | 
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| 15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the | 
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| 16 | GNU General Public License for more details. | 
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| 17 |  | 
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| 18 | You should have received a copy of the GNU General Public License | 
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| 19 | along with this program; if not, write to the Free Software | 
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| 20 | Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */ | 
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| 21 |  | 
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| 22 | #include "bfdlink.h" | 
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| 23 |  | 
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| 24 | #ifndef ECOFF_H | 
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| 25 | #include "coff/ecoff.h" | 
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| 26 | #endif | 
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| 27 |  | 
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| 28 | /* This is the backend information kept for ECOFF files.  This | 
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| 29 | structure is constant for a particular backend.  The first element | 
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| 30 | is the COFF backend data structure, so that ECOFF targets can use | 
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| 31 | the generic COFF code.  */ | 
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| 32 |  | 
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| 33 | #define ecoff_backend(abfd) \ | 
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| 34 | ((struct ecoff_backend_data *) (abfd)->xvec->backend_data) | 
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| 35 |  | 
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| 36 | struct ecoff_backend_data | 
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| 37 | { | 
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| 38 | /* COFF backend information.  This must be the first field.  */ | 
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| 39 | bfd_coff_backend_data coff; | 
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| 40 | /* Supported architecture.  */ | 
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| 41 | enum bfd_architecture arch; | 
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| 42 | /* Initial portion of armap string.  */ | 
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| 43 | const char *armap_start; | 
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| 44 | /* The page boundary used to align sections in a demand-paged | 
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| 45 | executable file.  E.g., 0x1000.  */ | 
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| 46 | bfd_vma round; | 
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| 47 | /* TRUE if the .rdata section is part of the text segment, as on the | 
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| 48 | Alpha.  FALSE if .rdata is part of the data segment, as on the | 
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| 49 | MIPS.  */ | 
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| 50 | bfd_boolean rdata_in_text; | 
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| 51 | /* Bitsize of constructor entries.  */ | 
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| 52 | unsigned int constructor_bitsize; | 
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| 53 | /* Reloc to use for constructor entries.  */ | 
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| 54 | reloc_howto_type *constructor_reloc; | 
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| 55 | /* How to swap debugging information.  */ | 
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| 56 | struct ecoff_debug_swap debug_swap; | 
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| 57 | /* External reloc size.  */ | 
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| 58 | bfd_size_type external_reloc_size; | 
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| 59 | /* Reloc swapping functions.  */ | 
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| 60 | void (*swap_reloc_in) PARAMS ((bfd *, PTR, struct internal_reloc *)); | 
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| 61 | void (*swap_reloc_out) PARAMS ((bfd *, const struct internal_reloc *, PTR)); | 
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| 62 | /* Backend reloc tweaking.  */ | 
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| 63 | void (*adjust_reloc_in) | 
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| 64 | PARAMS ((bfd *, const struct internal_reloc *, arelent *)); | 
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| 65 | void (*adjust_reloc_out) | 
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| 66 | PARAMS ((bfd *, const arelent *, struct internal_reloc *)); | 
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| 67 | /* Relocate section contents while linking.  */ | 
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| 68 | bfd_boolean (*relocate_section) | 
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| 69 | PARAMS ((bfd *output_bfd, struct bfd_link_info *, bfd *input_bfd, | 
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| 70 | asection *input_section, bfd_byte *contents, | 
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| 71 | PTR external_relocs)); | 
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| 72 | /* Do final adjustments to filehdr and aouthdr.  */ | 
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| 73 | bfd_boolean (*adjust_headers) | 
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| 74 | PARAMS ((bfd *, struct internal_filehdr *, struct internal_aouthdr *)); | 
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| 75 | /* Read an element from an archive at a given file position.  This | 
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| 76 | is needed because OSF/1 3.2 uses a weird archive format.  */ | 
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| 77 | bfd *(*get_elt_at_filepos) PARAMS ((bfd *, file_ptr)); | 
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| 78 | }; | 
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| 79 |  | 
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| 80 | /* This is the target specific information kept for ECOFF files.  */ | 
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| 81 |  | 
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| 82 | #define ecoff_data(abfd) ((abfd)->tdata.ecoff_obj_data) | 
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| 83 |  | 
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| 84 | typedef struct ecoff_tdata | 
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| 85 | { | 
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| 86 | /* The reloc file position, set by | 
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| 87 | ecoff_compute_section_file_positions.  */ | 
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| 88 | file_ptr reloc_filepos; | 
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| 89 |  | 
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| 90 | /* The symbol table file position, set by _bfd_ecoff_mkobject_hook.  */ | 
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| 91 | file_ptr sym_filepos; | 
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| 92 |  | 
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| 93 | /* The start and end of the text segment.  Only valid for an | 
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| 94 | existing file, not for one we are creating.  */ | 
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| 95 | unsigned long text_start; | 
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| 96 | unsigned long text_end; | 
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| 97 |  | 
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| 98 | /* The cached gp value.  This is used when relocating.  */ | 
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| 99 | bfd_vma gp; | 
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| 100 |  | 
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| 101 | /* The maximum size of objects to optimize using gp.  This is | 
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| 102 | typically set by the -G option to the compiler, assembler or | 
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| 103 | linker.  */ | 
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| 104 | unsigned int gp_size; | 
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| 105 |  | 
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| 106 | /* The register masks.  When linking, all the masks found in the | 
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| 107 | input files are combined into the masks of the output file. | 
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| 108 | These are not all used for all targets, but that's OK, because | 
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| 109 | the relevant ones are the only ones swapped in and out.  */ | 
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| 110 | unsigned long gprmask; | 
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| 111 | unsigned long fprmask; | 
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| 112 | unsigned long cprmask[4]; | 
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| 113 |  | 
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| 114 | /* The ECOFF symbolic debugging information.  */ | 
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| 115 | struct ecoff_debug_info debug_info; | 
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| 116 |  | 
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| 117 | /* The unswapped ECOFF symbolic information.  */ | 
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| 118 | PTR raw_syments; | 
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| 119 |  | 
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| 120 | /* The canonical BFD symbols.  */ | 
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| 121 | struct ecoff_symbol_struct *canonical_symbols; | 
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| 122 |  | 
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| 123 | /* A mapping from external symbol numbers to entries in the linker | 
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| 124 | hash table, used when linking.  */ | 
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| 125 | struct ecoff_link_hash_entry **sym_hashes; | 
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| 126 |  | 
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| 127 | /* A mapping from reloc symbol indices to sections, used when | 
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| 128 | linking.  */ | 
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| 129 | asection **symndx_to_section; | 
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| 130 |  | 
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| 131 | /* TRUE if this BFD was written by the backend linker.  */ | 
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| 132 | bfd_boolean linker; | 
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| 133 |  | 
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| 134 | /* TRUE if a warning that multiple global pointer values are | 
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| 135 | needed in the output binary was issued already.  */ | 
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| 136 | bfd_boolean issued_multiple_gp_warning; | 
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| 137 |  | 
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| 138 | /* Used by find_nearest_line entry point.  The structure could be | 
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| 139 | included directly in this one, but there's no point to wasting | 
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| 140 | the memory just for the infrequently called find_nearest_line.  */ | 
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| 141 | struct ecoff_find_line *find_line_info; | 
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| 142 |  | 
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| 143 | /* Whether the .rdata section is in the text segment for this | 
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| 144 | particular ECOFF file.  This is not valid until | 
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| 145 | ecoff_compute_section_file_positions is called.  */ | 
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| 146 | bfd_boolean rdata_in_text; | 
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| 147 |  | 
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| 148 | } ecoff_data_type; | 
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| 149 |  | 
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| 150 | /* Each canonical asymbol really looks like this.  */ | 
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| 151 |  | 
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| 152 | typedef struct ecoff_symbol_struct | 
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| 153 | { | 
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| 154 | /* The actual symbol which the rest of BFD works with */ | 
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| 155 | asymbol symbol; | 
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| 156 |  | 
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| 157 | /* The fdr for this symbol.  */ | 
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| 158 | FDR *fdr; | 
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| 159 |  | 
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| 160 | /* TRUE if this is a local symbol rather than an external one.  */ | 
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| 161 | bfd_boolean local; | 
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| 162 |  | 
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| 163 | /* A pointer to the unswapped hidden information for this symbol. | 
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| 164 | This is either a struct sym_ext or a struct ext_ext, depending on | 
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| 165 | the value of the local field above.  */ | 
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| 166 | PTR native; | 
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| 167 | } ecoff_symbol_type; | 
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| 168 |  | 
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| 169 | /* We take the address of the first element of an asymbol to ensure that the | 
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| 170 | macro is only ever applied to an asymbol.  */ | 
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| 171 | #define ecoffsymbol(asymbol) ((ecoff_symbol_type *) (&((asymbol)->the_bfd))) | 
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| 172 |  | 
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| 173 | /* We need to save the index of an external symbol when we write it | 
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| 174 | out so that can set the symbol index correctly when we write out | 
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| 175 | the relocs.  */ | 
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| 176 | #define ecoff_get_sym_index(symbol) ((symbol)->udata.i) | 
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| 177 | #define ecoff_set_sym_index(symbol, idx) ((symbol)->udata.i = (idx)) | 
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| 178 |  | 
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| 179 | /* When generating MIPS embedded PIC code, the linker relaxes the code | 
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| 180 | to turn PC relative branches into longer code sequences when the PC | 
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| 181 | relative branch is out of range.  This involves reading the relocs | 
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| 182 | in bfd_relax_section as well as in bfd_final_link, and requires the | 
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| 183 | code to keep track of which relocs have been expanded.  A pointer | 
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| 184 | to this structure is put in the used_by_bfd pointer of a section to | 
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| 185 | keep track of this information.  The user_by_bfd pointer will be | 
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| 186 | NULL if the information was not needed.  */ | 
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| 187 |  | 
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| 188 | struct ecoff_section_tdata | 
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| 189 | { | 
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| 190 | /* The unswapped relocs for this section.  These are stored in | 
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| 191 | memory so the input file does not have to be read twice.  */ | 
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| 192 | PTR external_relocs; | 
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| 193 |  | 
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| 194 | /* The contents of the section.  These bytes may or may not be saved | 
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| 195 | in memory, but if it is this is a pointer to them.  */ | 
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| 196 | bfd_byte *contents; | 
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| 197 |  | 
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| 198 | /* Offset adjustments for PC relative branches.  A number other than | 
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| 199 | 1 is an addend for a PC relative branch, or a switch table entry | 
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| 200 | which is the difference of two .text locations; this addend | 
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| 201 | arises because the branch or difference crosses one or more | 
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| 202 | branches which were expanded into a larger code sequence.  A 1 | 
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| 203 | means that this branch was itself expanded into a larger code | 
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| 204 | sequence.  1 is not a possible offset, since all offsets must be | 
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| 205 | multiples of the instruction size, which is 4; also, the only | 
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| 206 | relocs with non-zero offsets will be PC relative branches or | 
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| 207 | switch table entries within the same object file.  If this field | 
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| 208 | is NULL, no branches were expanded and no offsets are required. | 
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| 209 | Otherwise there are as many entries as there are relocs in the | 
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| 210 | section, and the entry for any reloc that is not PC relative is | 
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| 211 | zero.  */ | 
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| 212 | long *offsets; | 
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| 213 |  | 
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| 214 | /* When producing an executable (i.e., final, non-relocatable link) | 
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| 215 | on the Alpha, we may need to use multiple global pointer values | 
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| 216 | to span the entire .lita section.  In essence, we allow each | 
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| 217 | input .lita section to have its own gp value.  To support this, | 
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| 218 | we need to keep track of the gp values that we picked for each | 
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| 219 | input .lita section . */ | 
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| 220 | bfd_vma gp; | 
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| 221 | }; | 
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| 222 |  | 
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| 223 | /* An accessor macro for the ecoff_section_tdata structure.  */ | 
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| 224 | #define ecoff_section_data(abfd, sec) \ | 
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| 225 | ((struct ecoff_section_tdata *) (sec)->used_by_bfd) | 
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| 226 |  | 
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| 227 | /* ECOFF linker hash table entries.  */ | 
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| 228 |  | 
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| 229 | struct ecoff_link_hash_entry | 
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| 230 | { | 
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| 231 | struct bfd_link_hash_entry root; | 
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| 232 | /* Symbol index in output file.  */ | 
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| 233 | long indx; | 
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| 234 | /* BFD that ext field value came from.  */ | 
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| 235 | bfd *abfd; | 
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| 236 | /* ECOFF external symbol information.  */ | 
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| 237 | EXTR esym; | 
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| 238 | /* Nonzero if this symbol has been written out.  */ | 
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| 239 | char written; | 
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| 240 | /* Nonzero if this symbol was referred to as small undefined.  */ | 
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| 241 | char small; | 
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| 242 | }; | 
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| 243 |  | 
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| 244 | /* ECOFF linker hash table.  */ | 
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| 245 |  | 
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| 246 | struct ecoff_link_hash_table | 
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| 247 | { | 
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| 248 | struct bfd_link_hash_table root; | 
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| 249 | }; | 
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| 250 |  | 
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| 251 | /* Make an ECOFF object.  */ | 
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| 252 | extern bfd_boolean _bfd_ecoff_mkobject PARAMS ((bfd *)); | 
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| 253 |  | 
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| 254 | /* Read in the ECOFF symbolic debugging information.  */ | 
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| 255 | extern bfd_boolean _bfd_ecoff_slurp_symbolic_info | 
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| 256 | PARAMS ((bfd *, asection *, struct ecoff_debug_info *)); | 
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| 257 |  | 
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| 258 | /* Generic ECOFF BFD backend vectors.  */ | 
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| 259 |  | 
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| 260 | extern bfd_boolean _bfd_ecoff_write_object_contents PARAMS ((bfd *abfd)); | 
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| 261 | extern const bfd_target *_bfd_ecoff_archive_p PARAMS ((bfd *abfd)); | 
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| 262 |  | 
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| 263 | #define _bfd_ecoff_close_and_cleanup _bfd_generic_close_and_cleanup | 
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| 264 | #define _bfd_ecoff_bfd_free_cached_info _bfd_generic_bfd_free_cached_info | 
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| 265 | extern bfd_boolean _bfd_ecoff_new_section_hook | 
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| 266 | PARAMS ((bfd *, asection *)); | 
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| 267 | extern bfd_boolean _bfd_ecoff_get_section_contents | 
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| 268 | PARAMS ((bfd *, asection *, PTR location, file_ptr, bfd_size_type)); | 
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| 269 |  | 
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| 270 | #define _bfd_ecoff_bfd_link_split_section _bfd_generic_link_split_section | 
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| 271 |  | 
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| 272 | extern bfd_boolean _bfd_ecoff_bfd_copy_private_bfd_data | 
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| 273 | PARAMS ((bfd *, bfd *)); | 
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| 274 | #define _bfd_ecoff_bfd_copy_private_section_data \ | 
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| 275 | _bfd_generic_bfd_copy_private_section_data | 
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| 276 |  | 
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| 277 | #define _bfd_ecoff_bfd_copy_private_symbol_data \ | 
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| 278 | _bfd_generic_bfd_copy_private_symbol_data | 
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| 279 |  | 
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| 280 | #define _bfd_ecoff_bfd_print_private_bfd_data \ | 
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| 281 | _bfd_generic_bfd_print_private_bfd_data | 
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| 282 |  | 
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| 283 | #define _bfd_ecoff_bfd_merge_private_bfd_data \ | 
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| 284 | _bfd_generic_bfd_merge_private_bfd_data | 
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| 285 |  | 
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| 286 | #define _bfd_ecoff_bfd_set_private_flags _bfd_generic_bfd_set_private_flags | 
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| 287 | extern bfd_boolean _bfd_ecoff_slurp_armap PARAMS ((bfd *abfd)); | 
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| 288 | #define _bfd_ecoff_slurp_extended_name_table _bfd_slurp_extended_name_table | 
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| 289 | #define _bfd_ecoff_construct_extended_name_table \ | 
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| 290 | _bfd_archive_bsd_construct_extended_name_table | 
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| 291 | #define _bfd_ecoff_truncate_arname bfd_dont_truncate_arname | 
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| 292 | extern bfd_boolean _bfd_ecoff_write_armap | 
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| 293 | PARAMS ((bfd *, unsigned int, struct orl *, unsigned int, int)); | 
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| 294 | #define _bfd_ecoff_read_ar_hdr _bfd_generic_read_ar_hdr | 
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| 295 | #define _bfd_ecoff_openr_next_archived_file \ | 
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| 296 | bfd_generic_openr_next_archived_file | 
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| 297 | #define _bfd_ecoff_get_elt_at_index _bfd_generic_get_elt_at_index | 
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| 298 | #define _bfd_ecoff_generic_stat_arch_elt bfd_generic_stat_arch_elt | 
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| 299 | #define _bfd_ecoff_update_armap_timestamp bfd_true | 
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| 300 |  | 
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| 301 | extern long _bfd_ecoff_get_symtab_upper_bound PARAMS ((bfd *abfd)); | 
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| 302 | extern long _bfd_ecoff_get_symtab PARAMS ((bfd *abfd, asymbol **alocation)); | 
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| 303 | extern asymbol *_bfd_ecoff_make_empty_symbol PARAMS ((bfd *abfd)); | 
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| 304 | extern void _bfd_ecoff_print_symbol | 
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| 305 | PARAMS ((bfd *, PTR filep, asymbol *, bfd_print_symbol_type)); | 
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| 306 | extern void _bfd_ecoff_get_symbol_info | 
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| 307 | PARAMS ((bfd *, asymbol *, symbol_info *)); | 
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| 308 | extern bfd_boolean _bfd_ecoff_bfd_is_local_label_name | 
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| 309 | PARAMS ((bfd *, const char *)); | 
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| 310 | #define _bfd_ecoff_get_lineno _bfd_nosymbols_get_lineno | 
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| 311 | extern bfd_boolean _bfd_ecoff_find_nearest_line | 
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| 312 | PARAMS ((bfd *, asection *, asymbol **, bfd_vma offset, | 
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| 313 | const char **filename_ptr, const char **fnname_ptr, | 
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| 314 | unsigned int *retline_ptr)); | 
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| 315 | #define _bfd_ecoff_bfd_make_debug_symbol _bfd_nosymbols_bfd_make_debug_symbol | 
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| 316 | #define _bfd_ecoff_read_minisymbols _bfd_generic_read_minisymbols | 
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| 317 | #define _bfd_ecoff_minisymbol_to_symbol _bfd_generic_minisymbol_to_symbol | 
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| 318 |  | 
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| 319 | #define _bfd_ecoff_get_reloc_upper_bound coff_get_reloc_upper_bound | 
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| 320 | extern long _bfd_ecoff_canonicalize_reloc | 
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| 321 | PARAMS ((bfd *, asection *, arelent **, asymbol **symbols)); | 
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| 322 | /* ecoff_bfd_reloc_type_lookup defined by backend. */ | 
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| 323 |  | 
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| 324 | extern bfd_boolean _bfd_ecoff_set_arch_mach | 
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| 325 | PARAMS ((bfd *, enum bfd_architecture, unsigned long)); | 
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| 326 | extern bfd_boolean _bfd_ecoff_set_section_contents | 
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| 327 | PARAMS ((bfd *, asection *, PTR location, file_ptr, bfd_size_type)); | 
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| 328 |  | 
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| 329 | extern int _bfd_ecoff_sizeof_headers PARAMS ((bfd *abfd, bfd_boolean reloc)); | 
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| 330 | /* ecoff_bfd_get_relocated_section_contents defined by backend.  */ | 
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| 331 | /* ecoff_bfd_relax_section defined by backend.  */ | 
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| 332 | extern struct bfd_link_hash_table *_bfd_ecoff_bfd_link_hash_table_create | 
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| 333 | PARAMS ((bfd *)); | 
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| 334 | #define _bfd_ecoff_bfd_link_hash_table_free _bfd_generic_link_hash_table_free | 
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| 335 | extern bfd_boolean _bfd_ecoff_bfd_link_add_symbols | 
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| 336 | PARAMS ((bfd *, struct bfd_link_info *)); | 
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| 337 | #define _bfd_ecoff_bfd_link_just_syms _bfd_generic_link_just_syms | 
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| 338 | extern bfd_boolean _bfd_ecoff_bfd_final_link | 
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| 339 | PARAMS ((bfd *, struct bfd_link_info *)); | 
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| 340 |  | 
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| 341 | /* Hook functions for the generic COFF section reading code.  */ | 
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| 342 |  | 
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| 343 | extern PTR _bfd_ecoff_mkobject_hook PARAMS ((bfd *, PTR filehdr, PTR aouthdr)); | 
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| 344 | #define _bfd_ecoff_set_alignment_hook \ | 
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| 345 | ((void (*) PARAMS ((bfd *, asection *, PTR))) bfd_void) | 
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| 346 | extern bfd_boolean _bfd_ecoff_set_arch_mach_hook | 
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| 347 | PARAMS ((bfd *abfd, PTR filehdr)); | 
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| 348 | extern bfd_boolean _bfd_ecoff_styp_to_sec_flags | 
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| 349 | PARAMS ((bfd *, PTR, const char *, asection *, flagword *)); | 
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| 350 | extern bfd_boolean _bfd_ecoff_slurp_symbol_table PARAMS ((bfd *abfd)); | 
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| 351 |  | 
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| 352 | /* ECOFF auxiliary information swapping routines.  These are the same | 
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| 353 | for all ECOFF targets, so they are defined in ecofflink.c.  */ | 
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| 354 |  | 
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| 355 | extern void _bfd_ecoff_swap_tir_in | 
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| 356 | PARAMS ((int, const struct tir_ext *, TIR *)); | 
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| 357 | extern void _bfd_ecoff_swap_tir_out | 
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| 358 | PARAMS ((int, const TIR *, struct tir_ext *)); | 
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| 359 | extern void _bfd_ecoff_swap_rndx_in | 
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| 360 | PARAMS ((int, const struct rndx_ext *, RNDXR *)); | 
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| 361 | extern void _bfd_ecoff_swap_rndx_out | 
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| 362 | PARAMS ((int, const RNDXR *, struct rndx_ext *)); | 
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