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5197 | serge | 1 | /* BFD ECOFF object file private structure. |
2 | Copyright 1993, 1994, 1995, 1996, 1999, 2001, 2002, 2003, 2004, |
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3 | 2005, 2006, 2007, 2008, 2009, 2010 |
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4 | Free Software Foundation, Inc. |
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5 | Written by Ian Lance Taylor, Cygnus Support. |
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6 | |||
7 | This file is part of BFD, the Binary File Descriptor library. |
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8 | |||
9 | This program is free software; you can redistribute it and/or modify |
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10 | it under the terms of the GNU General Public License as published by |
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11 | the Free Software Foundation; either version 3 of the License, or |
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12 | (at your option) any later version. |
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13 | |||
14 | This program is distributed in the hope that it will be useful, |
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15 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
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16 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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17 | GNU General Public License for more details. |
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18 | |||
19 | You should have received a copy of the GNU General Public License |
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20 | along with this program; if not, write to the Free Software |
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21 | Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, |
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22 | MA 02110-1301, USA. */ |
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23 | |||
24 | #include "bfdlink.h" |
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25 | |||
26 | #ifndef ECOFF_H |
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27 | #include "coff/ecoff.h" |
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28 | #endif |
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29 | |||
30 | /* This is the backend information kept for ECOFF files. This |
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31 | structure is constant for a particular backend. The first element |
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32 | is the COFF backend data structure, so that ECOFF targets can use |
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33 | the generic COFF code. */ |
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34 | |||
35 | #define ecoff_backend(abfd) \ |
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36 | ((struct ecoff_backend_data *) (abfd)->xvec->backend_data) |
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37 | |||
38 | struct ecoff_backend_data |
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39 | { |
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40 | /* COFF backend information. This must be the first field. */ |
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41 | bfd_coff_backend_data coff; |
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42 | /* Supported architecture. */ |
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43 | enum bfd_architecture arch; |
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44 | /* Initial portion of armap string. */ |
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45 | const char *armap_start; |
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46 | /* The page boundary used to align sections in a demand-paged |
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47 | executable file. E.g., 0x1000. */ |
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48 | bfd_vma round; |
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49 | /* TRUE if the .rdata section is part of the text segment, as on the |
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50 | Alpha. FALSE if .rdata is part of the data segment, as on the |
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51 | MIPS. */ |
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52 | bfd_boolean rdata_in_text; |
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53 | /* Bitsize of constructor entries. */ |
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54 | unsigned int constructor_bitsize; |
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55 | /* Reloc to use for constructor entries. */ |
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56 | reloc_howto_type *constructor_reloc; |
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57 | /* How to swap debugging information. */ |
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58 | struct ecoff_debug_swap debug_swap; |
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59 | /* External reloc size. */ |
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60 | bfd_size_type external_reloc_size; |
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61 | /* Reloc swapping functions. */ |
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62 | void (*swap_reloc_in) (bfd *, void *, struct internal_reloc *); |
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63 | void (*swap_reloc_out) (bfd *, const struct internal_reloc *, void *); |
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64 | /* Backend reloc tweaking. */ |
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65 | void (*adjust_reloc_in) |
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66 | (bfd *, const struct internal_reloc *, arelent *); |
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67 | void (*adjust_reloc_out) |
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68 | (bfd *, const arelent *, struct internal_reloc *); |
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69 | /* Relocate section contents while linking. */ |
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70 | bfd_boolean (*relocate_section) |
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71 | (bfd *, struct bfd_link_info *, bfd *, asection *, bfd_byte *, void *); |
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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 | (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) (bfd *, file_ptr); |
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78 | }; |
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79 | |||
80 | /* ECOFF targets don't support COFF long section names, so this |
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81 | macro is provided to use as an initialiser for the related |
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82 | members of the embedded bfd_coff_backend_data struct. */ |
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83 | #define ECOFF_NO_LONG_SECTION_NAMES (FALSE), _bfd_ecoff_no_long_sections |
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84 | |||
85 | /* This is the target specific information kept for ECOFF files. */ |
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86 | |||
87 | #define ecoff_data(abfd) ((abfd)->tdata.ecoff_obj_data) |
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88 | |||
89 | typedef struct ecoff_tdata |
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90 | { |
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91 | /* The reloc file position, set by |
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92 | ecoff_compute_section_file_positions. */ |
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93 | file_ptr reloc_filepos; |
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94 | |||
95 | /* The symbol table file position, set by _bfd_ecoff_mkobject_hook. */ |
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96 | file_ptr sym_filepos; |
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97 | |||
98 | /* The start and end of the text segment. Only valid for an |
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99 | existing file, not for one we are creating. */ |
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100 | unsigned long text_start; |
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101 | unsigned long text_end; |
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102 | |||
103 | /* The cached gp value. This is used when relocating. */ |
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104 | bfd_vma gp; |
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105 | |||
106 | /* The maximum size of objects to optimize using gp. This is |
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107 | typically set by the -G option to the compiler, assembler or |
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108 | linker. */ |
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109 | unsigned int gp_size; |
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110 | |||
111 | /* The register masks. When linking, all the masks found in the |
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112 | input files are combined into the masks of the output file. |
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113 | These are not all used for all targets, but that's OK, because |
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114 | the relevant ones are the only ones swapped in and out. */ |
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115 | unsigned long gprmask; |
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116 | unsigned long fprmask; |
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117 | unsigned long cprmask[4]; |
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118 | |||
119 | /* The ECOFF symbolic debugging information. */ |
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120 | struct ecoff_debug_info debug_info; |
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121 | |||
122 | /* The unswapped ECOFF symbolic information. */ |
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123 | void * raw_syments; |
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124 | |||
125 | /* The canonical BFD symbols. */ |
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126 | struct ecoff_symbol_struct *canonical_symbols; |
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127 | |||
128 | /* A mapping from external symbol numbers to entries in the linker |
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129 | hash table, used when linking. */ |
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130 | struct ecoff_link_hash_entry **sym_hashes; |
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131 | |||
132 | /* A mapping from reloc symbol indices to sections, used when |
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133 | linking. */ |
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134 | asection **symndx_to_section; |
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135 | |||
136 | /* TRUE if this BFD was written by the backend linker. */ |
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137 | bfd_boolean linker; |
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138 | |||
139 | /* TRUE if a warning that multiple global pointer values are |
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140 | needed in the output binary was issued already. */ |
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141 | bfd_boolean issued_multiple_gp_warning; |
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142 | |||
143 | /* Used by find_nearest_line entry point. The structure could be |
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144 | included directly in this one, but there's no point to wasting |
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145 | the memory just for the infrequently called find_nearest_line. */ |
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146 | struct ecoff_find_line *find_line_info; |
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147 | |||
148 | /* Whether the .rdata section is in the text segment for this |
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149 | particular ECOFF file. This is not valid until |
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150 | ecoff_compute_section_file_positions is called. */ |
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151 | bfd_boolean rdata_in_text; |
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152 | |||
153 | } ecoff_data_type; |
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154 | |||
155 | /* Each canonical asymbol really looks like this. */ |
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156 | |||
157 | typedef struct ecoff_symbol_struct |
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158 | { |
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159 | /* The actual symbol which the rest of BFD works with */ |
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160 | asymbol symbol; |
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161 | |||
162 | /* The fdr for this symbol. */ |
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163 | FDR *fdr; |
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164 | |||
165 | /* TRUE if this is a local symbol rather than an external one. */ |
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166 | bfd_boolean local; |
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167 | |||
168 | /* A pointer to the unswapped hidden information for this symbol. |
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169 | This is either a struct sym_ext or a struct ext_ext, depending on |
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170 | the value of the local field above. */ |
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171 | void * native; |
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172 | } ecoff_symbol_type; |
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173 | |||
174 | /* We take the address of the first element of an asymbol to ensure that the |
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175 | macro is only ever applied to an asymbol. */ |
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176 | #define ecoffsymbol(asymbol) ((ecoff_symbol_type *) (&((asymbol)->the_bfd))) |
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177 | |||
178 | /* We need to save the index of an external symbol when we write it |
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179 | out so that can set the symbol index correctly when we write out |
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180 | the relocs. */ |
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181 | #define ecoff_get_sym_index(symbol) ((symbol)->udata.i) |
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182 | #define ecoff_set_sym_index(symbol, idx) ((symbol)->udata.i = (idx)) |
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183 | |||
184 | /* A pointer to this structure is put in the used_by_bfd pointer of |
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185 | a section to keep track of any per-section data. |
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186 | The user_by_bfd pointer will be NULL if the information was not |
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187 | needed. */ |
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188 | |||
189 | struct ecoff_section_tdata |
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190 | { |
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191 | /* When producing an executable (i.e., final, non-relocatable link) |
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192 | on the Alpha, we may need to use multiple global pointer values |
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193 | to span the entire .lita section. In essence, we allow each |
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194 | input .lita section to have its own gp value. To support this, |
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195 | we need to keep track of the gp values that we picked for each |
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196 | input .lita section . */ |
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197 | bfd_vma gp; |
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198 | }; |
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199 | |||
200 | /* An accessor macro for the ecoff_section_tdata structure. */ |
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201 | #define ecoff_section_data(abfd, sec) \ |
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202 | ((struct ecoff_section_tdata *) (sec)->used_by_bfd) |
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203 | |||
204 | /* ECOFF linker hash table entries. */ |
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205 | |||
206 | struct ecoff_link_hash_entry |
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207 | { |
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208 | struct bfd_link_hash_entry root; |
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209 | /* Symbol index in output file. */ |
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210 | long indx; |
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211 | /* BFD that ext field value came from. */ |
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212 | bfd *abfd; |
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213 | /* ECOFF external symbol information. */ |
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214 | EXTR esym; |
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215 | /* Nonzero if this symbol has been written out. */ |
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216 | char written; |
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217 | /* Nonzero if this symbol was referred to as small undefined. */ |
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218 | char small; |
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219 | }; |
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220 | |||
221 | /* ECOFF linker hash table. */ |
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222 | |||
223 | struct ecoff_link_hash_table |
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224 | { |
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225 | struct bfd_link_hash_table root; |
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226 | }; |
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227 | |||
228 | /* Make an ECOFF object. */ |
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229 | extern bfd_boolean _bfd_ecoff_mkobject (bfd *); |
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230 | |||
231 | /* Read in the ECOFF symbolic debugging information. */ |
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232 | extern bfd_boolean _bfd_ecoff_slurp_symbolic_info |
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233 | (bfd *, asection *, struct ecoff_debug_info *); |
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234 | |||
235 | /* Generic ECOFF BFD backend vectors. */ |
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236 | |||
237 | extern bfd_boolean _bfd_ecoff_write_object_contents (bfd *); |
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238 | |||
239 | #define _bfd_ecoff_close_and_cleanup _bfd_generic_close_and_cleanup |
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240 | #define _bfd_ecoff_bfd_free_cached_info _bfd_generic_bfd_free_cached_info |
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241 | extern bfd_boolean _bfd_ecoff_new_section_hook |
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242 | (bfd *, asection *); |
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243 | extern bfd_boolean _bfd_ecoff_get_section_contents |
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244 | (bfd *, asection *, void * location, file_ptr, bfd_size_type); |
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245 | |||
246 | #define _bfd_ecoff_bfd_link_split_section _bfd_generic_link_split_section |
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247 | |||
248 | extern bfd_boolean _bfd_ecoff_bfd_copy_private_bfd_data |
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249 | (bfd *, bfd *); |
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250 | #define _bfd_ecoff_bfd_copy_private_section_data \ |
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251 | _bfd_generic_bfd_copy_private_section_data |
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252 | |||
253 | #define _bfd_ecoff_bfd_copy_private_symbol_data \ |
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254 | _bfd_generic_bfd_copy_private_symbol_data |
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255 | |||
256 | #define _bfd_ecoff_bfd_copy_private_header_data \ |
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257 | _bfd_generic_bfd_copy_private_header_data |
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258 | |||
259 | #define _bfd_ecoff_bfd_print_private_bfd_data \ |
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260 | _bfd_generic_bfd_print_private_bfd_data |
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261 | |||
262 | #define _bfd_ecoff_bfd_merge_private_bfd_data \ |
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263 | _bfd_generic_bfd_merge_private_bfd_data |
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264 | |||
265 | #define _bfd_ecoff_bfd_set_private_flags _bfd_generic_bfd_set_private_flags |
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266 | extern bfd_boolean _bfd_ecoff_slurp_armap (bfd *); |
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267 | #define _bfd_ecoff_slurp_extended_name_table _bfd_slurp_extended_name_table |
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268 | #define _bfd_ecoff_construct_extended_name_table \ |
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269 | _bfd_archive_bsd_construct_extended_name_table |
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270 | #define _bfd_ecoff_truncate_arname bfd_dont_truncate_arname |
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271 | extern bfd_boolean _bfd_ecoff_write_armap |
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272 | (bfd *, unsigned int, struct orl *, unsigned int, int); |
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273 | #define _bfd_ecoff_read_ar_hdr _bfd_generic_read_ar_hdr |
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274 | #define _bfd_ecoff_write_ar_hdr _bfd_generic_write_ar_hdr |
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275 | #define _bfd_ecoff_openr_next_archived_file \ |
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276 | bfd_generic_openr_next_archived_file |
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277 | #define _bfd_ecoff_get_elt_at_index _bfd_generic_get_elt_at_index |
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278 | #define _bfd_ecoff_generic_stat_arch_elt bfd_generic_stat_arch_elt |
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279 | #define _bfd_ecoff_update_armap_timestamp bfd_true |
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280 | #define _bfd_ecoff_bfd_is_target_special_symbol \ |
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281 | ((bfd_boolean (*) (bfd *, asymbol *)) bfd_false) |
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282 | |||
283 | extern long _bfd_ecoff_get_symtab_upper_bound (bfd *); |
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284 | extern long _bfd_ecoff_canonicalize_symtab (bfd *, asymbol **); |
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285 | extern asymbol *_bfd_ecoff_make_empty_symbol (bfd *); |
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286 | extern void _bfd_ecoff_print_symbol |
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287 | (bfd *, void *, asymbol *, bfd_print_symbol_type); |
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288 | extern void _bfd_ecoff_get_symbol_info |
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289 | (bfd *, asymbol *, symbol_info *); |
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290 | extern bfd_boolean _bfd_ecoff_bfd_is_local_label_name |
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291 | (bfd *, const char *); |
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292 | #define _bfd_ecoff_get_lineno _bfd_nosymbols_get_lineno |
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293 | extern bfd_boolean _bfd_ecoff_find_nearest_line |
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294 | (bfd *, asection *, asymbol **, bfd_vma, const char **, const char **, |
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295 | unsigned int *); |
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296 | #define _bfd_ecoff_bfd_make_debug_symbol _bfd_nosymbols_bfd_make_debug_symbol |
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297 | #define _bfd_ecoff_read_minisymbols _bfd_generic_read_minisymbols |
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298 | #define _bfd_ecoff_minisymbol_to_symbol _bfd_generic_minisymbol_to_symbol |
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299 | #define _bfd_ecoff_find_inliner_info _bfd_nosymbols_find_inliner_info |
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300 | |||
301 | #define _bfd_ecoff_get_reloc_upper_bound coff_get_reloc_upper_bound |
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302 | extern long _bfd_ecoff_canonicalize_reloc |
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303 | (bfd *, asection *, arelent **, asymbol **symbols); |
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304 | /* ecoff_bfd_reloc_type_lookup defined by backend. */ |
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305 | |||
306 | extern bfd_boolean _bfd_ecoff_set_arch_mach |
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307 | (bfd *, enum bfd_architecture, unsigned long); |
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308 | extern bfd_boolean _bfd_ecoff_set_section_contents |
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309 | (bfd *, asection *, const void * location, file_ptr, bfd_size_type); |
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310 | |||
311 | extern int _bfd_ecoff_sizeof_headers (bfd *, struct bfd_link_info *); |
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312 | /* ecoff_bfd_get_relocated_section_contents defined by backend. */ |
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313 | /* ecoff_bfd_relax_section defined by backend. */ |
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314 | extern struct bfd_link_hash_table *_bfd_ecoff_bfd_link_hash_table_create |
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315 | (bfd *); |
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316 | #define _bfd_ecoff_bfd_link_hash_table_free _bfd_generic_link_hash_table_free |
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317 | extern bfd_boolean _bfd_ecoff_bfd_link_add_symbols |
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318 | (bfd *, struct bfd_link_info *); |
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319 | #define _bfd_ecoff_bfd_link_just_syms _bfd_generic_link_just_syms |
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320 | #define _bfd_ecoff_bfd_copy_link_hash_symbol_type \ |
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321 | _bfd_generic_copy_link_hash_symbol_type |
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322 | extern bfd_boolean _bfd_ecoff_bfd_final_link |
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323 | (bfd *, struct bfd_link_info *); |
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324 | |||
325 | /* Hook functions for the generic COFF section reading code. */ |
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326 | |||
327 | extern void * _bfd_ecoff_mkobject_hook (bfd *, void *, void *); |
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328 | #define _bfd_ecoff_set_alignment_hook \ |
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329 | ((void (*) (bfd *, asection *, void *)) bfd_void) |
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330 | extern bfd_boolean _bfd_ecoff_set_arch_mach_hook |
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331 | (bfd *, void *); |
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332 | extern bfd_boolean _bfd_ecoff_no_long_sections |
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333 | (bfd *abfd, int enable); |
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334 | extern bfd_boolean _bfd_ecoff_styp_to_sec_flags |
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335 | (bfd *, void *, const char *, asection *, flagword *); |
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336 | extern bfd_boolean _bfd_ecoff_slurp_symbol_table (bfd *); |
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337 | |||
338 | /* ECOFF auxiliary information swapping routines. These are the same |
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339 | for all ECOFF targets, so they are defined in ecofflink.c. */ |
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340 | |||
341 | extern void _bfd_ecoff_swap_tir_in |
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342 | (int, const struct tir_ext *, TIR *); |
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343 | extern void _bfd_ecoff_swap_tir_out |
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344 | (int, const TIR *, struct tir_ext *); |
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345 | extern void _bfd_ecoff_swap_rndx_in |
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346 | (int, const struct rndx_ext *, RNDXR *); |
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347 | extern void _bfd_ecoff_swap_rndx_out |
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348 | (int, const RNDXR *, struct rndx_ext *); |