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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