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1 /* bfdlink.h -- header file for BFD link routines |
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2 Copyright 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, |
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3 2003, 2004, 2005, 2006, 2007 Free Software Foundation, Inc. |
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4 Written by Steve Chamberlain and 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 3 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., 51 Franklin Street - Fifth Floor, Boston, |
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21 MA 02110-1301, USA. */ |
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22 |
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23 #ifndef BFDLINK_H |
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24 #define BFDLINK_H |
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25 |
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26 /* Which symbols to strip during a link. */ |
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27 enum bfd_link_strip |
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28 { |
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29 strip_none, /* Don't strip any symbols. */ |
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30 strip_debugger, /* Strip debugging symbols. */ |
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31 strip_some, /* keep_hash is the list of symbols to keep. */ |
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32 strip_all /* Strip all symbols. */ |
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33 }; |
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34 |
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35 /* Which local symbols to discard during a link. This is irrelevant |
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36 if strip_all is used. */ |
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37 enum bfd_link_discard |
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38 { |
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39 discard_sec_merge, /* Discard local temporary symbols in SEC_MERGE |
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40 sections. */ |
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41 discard_none, /* Don't discard any locals. */ |
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42 discard_l, /* Discard local temporary symbols. */ |
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43 discard_all /* Discard all locals. */ |
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44 }; |
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45 |
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46 /* Describes the type of hash table entry structure being used. |
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47 Different hash table structure have different fields and so |
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48 support different linking features. */ |
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49 enum bfd_link_hash_table_type |
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50 { |
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51 bfd_link_generic_hash_table, |
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52 bfd_link_elf_hash_table |
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53 }; |
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54 |
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55 /* These are the possible types of an entry in the BFD link hash |
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56 table. */ |
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57 |
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58 enum bfd_link_hash_type |
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59 { |
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60 bfd_link_hash_new, /* Symbol is new. */ |
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61 bfd_link_hash_undefined, /* Symbol seen before, but undefined. */ |
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62 bfd_link_hash_undefweak, /* Symbol is weak and undefined. */ |
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63 bfd_link_hash_defined, /* Symbol is defined. */ |
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64 bfd_link_hash_defweak, /* Symbol is weak and defined. */ |
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65 bfd_link_hash_common, /* Symbol is common. */ |
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66 bfd_link_hash_indirect, /* Symbol is an indirect link. */ |
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67 bfd_link_hash_warning /* Like indirect, but warn if referenced. */ |
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68 }; |
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69 |
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70 enum bfd_link_common_skip_ar_aymbols |
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71 { |
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72 bfd_link_common_skip_none, |
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73 bfd_link_common_skip_text, |
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74 bfd_link_common_skip_data, |
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75 bfd_link_common_skip_all |
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76 }; |
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77 |
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78 /* The linking routines use a hash table which uses this structure for |
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79 its elements. */ |
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80 |
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81 struct bfd_link_hash_entry |
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82 { |
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83 /* Base hash table entry structure. */ |
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84 struct bfd_hash_entry root; |
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85 |
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86 /* Type of this entry. */ |
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87 enum bfd_link_hash_type type; |
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88 |
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89 /* A union of information depending upon the type. */ |
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90 union |
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91 { |
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92 /* Nothing is kept for bfd_hash_new. */ |
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93 /* bfd_link_hash_undefined, bfd_link_hash_undefweak. */ |
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94 struct |
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95 { |
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96 /* Undefined and common symbols are kept in a linked list through |
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97 this field. This field is present in all of the union element |
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98 so that we don't need to remove entries from the list when we |
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99 change their type. Removing entries would either require the |
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100 list to be doubly linked, which would waste more memory, or |
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101 require a traversal. When an undefined or common symbol is |
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102 created, it should be added to this list, the head of which is in |
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103 the link hash table itself. As symbols are defined, they need |
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104 not be removed from the list; anything which reads the list must |
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105 doublecheck the symbol type. |
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106 |
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107 Weak symbols are not kept on this list. |
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108 |
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109 Defined and defweak symbols use this field as a reference marker. |
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110 If the field is not NULL, or this structure is the tail of the |
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111 undefined symbol list, the symbol has been referenced. If the |
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112 symbol is undefined and becomes defined, this field will |
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113 automatically be non-NULL since the symbol will have been on the |
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114 undefined symbol list. */ |
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115 struct bfd_link_hash_entry *next; |
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116 bfd *abfd; /* BFD symbol was found in. */ |
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117 bfd *weak; /* BFD weak symbol was found in. */ |
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118 } undef; |
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119 /* bfd_link_hash_defined, bfd_link_hash_defweak. */ |
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120 struct |
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121 { |
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122 struct bfd_link_hash_entry *next; |
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123 asection *section; /* Symbol section. */ |
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124 bfd_vma value; /* Symbol value. */ |
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125 } def; |
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126 /* bfd_link_hash_indirect, bfd_link_hash_warning. */ |
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127 struct |
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128 { |
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129 struct bfd_link_hash_entry *next; |
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130 struct bfd_link_hash_entry *link; /* Real symbol. */ |
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131 const char *warning; /* Warning (bfd_link_hash_warning only). */ |
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132 } i; |
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133 /* bfd_link_hash_common. */ |
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134 struct |
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135 { |
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136 struct bfd_link_hash_entry *next; |
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137 /* The linker needs to know three things about common |
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138 symbols: the size, the alignment, and the section in |
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139 which the symbol should be placed. We store the size |
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140 here, and we allocate a small structure to hold the |
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141 section and the alignment. The alignment is stored as a |
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142 power of two. We don't store all the information |
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143 directly because we don't want to increase the size of |
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144 the union; this structure is a major space user in the |
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145 linker. */ |
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146 struct bfd_link_hash_common_entry |
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147 { |
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148 unsigned int alignment_power; /* Alignment. */ |
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149 asection *section; /* Symbol section. */ |
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150 } *p; |
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151 bfd_size_type size; /* Common symbol size. */ |
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152 } c; |
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153 } u; |
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154 }; |
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155 |
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156 /* This is the link hash table. It is a derived class of |
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157 bfd_hash_table. */ |
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158 |
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159 struct bfd_link_hash_table |
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160 { |
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161 /* The hash table itself. */ |
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162 struct bfd_hash_table table; |
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163 /* The back end which created this hash table. This indicates the |
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164 type of the entries in the hash table, which is sometimes |
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165 important information when linking object files of different |
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166 types together. */ |
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167 const bfd_target *creator; |
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168 /* A linked list of undefined and common symbols, linked through the |
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169 next field in the bfd_link_hash_entry structure. */ |
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170 struct bfd_link_hash_entry *undefs; |
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171 /* Entries are added to the tail of the undefs list. */ |
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172 struct bfd_link_hash_entry *undefs_tail; |
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173 /* The type of the link hash table. */ |
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174 enum bfd_link_hash_table_type type; |
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175 }; |
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176 |
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177 /* Look up an entry in a link hash table. If FOLLOW is TRUE, this |
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178 follows bfd_link_hash_indirect and bfd_link_hash_warning links to |
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179 the real symbol. */ |
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180 extern struct bfd_link_hash_entry *bfd_link_hash_lookup |
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181 (struct bfd_link_hash_table *, const char *, bfd_boolean create, |
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182 bfd_boolean copy, bfd_boolean follow); |
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183 |
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184 /* Look up an entry in the main linker hash table if the symbol might |
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185 be wrapped. This should only be used for references to an |
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186 undefined symbol, not for definitions of a symbol. */ |
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187 |
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188 extern struct bfd_link_hash_entry *bfd_wrapped_link_hash_lookup |
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189 (bfd *, struct bfd_link_info *, const char *, bfd_boolean, |
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190 bfd_boolean, bfd_boolean); |
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191 |
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192 /* Traverse a link hash table. */ |
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193 extern void bfd_link_hash_traverse |
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194 (struct bfd_link_hash_table *, |
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195 bfd_boolean (*) (struct bfd_link_hash_entry *, void *), |
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196 void *); |
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197 |
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198 /* Add an entry to the undefs list. */ |
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199 extern void bfd_link_add_undef |
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200 (struct bfd_link_hash_table *, struct bfd_link_hash_entry *); |
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201 |
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202 /* Remove symbols from the undefs list that don't belong there. */ |
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203 extern void bfd_link_repair_undef_list |
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204 (struct bfd_link_hash_table *table); |
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205 |
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206 struct bfd_sym_chain |
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207 { |
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208 struct bfd_sym_chain *next; |
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209 const char *name; |
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210 }; |
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211 |
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212 /* How to handle unresolved symbols. |
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213 There are four possibilities which are enumerated below: */ |
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214 enum report_method |
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215 { |
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216 /* This is the initial value when then link_info structure is created. |
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217 It allows the various stages of the linker to determine whether they |
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218 allowed to set the value. */ |
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219 RM_NOT_YET_SET = 0, |
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220 RM_IGNORE, |
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221 RM_GENERATE_WARNING, |
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222 RM_GENERATE_ERROR |
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223 }; |
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224 |
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225 struct bfd_elf_dynamic_list; |
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226 |
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227 /* This structure holds all the information needed to communicate |
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228 between BFD and the linker when doing a link. */ |
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229 |
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230 struct bfd_link_info |
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231 { |
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232 /* TRUE if BFD should generate a relocatable object file. */ |
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233 unsigned int relocatable: 1; |
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234 |
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235 /* TRUE if BFD should generate relocation information in the final |
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236 executable. */ |
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237 unsigned int emitrelocations: 1; |
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238 |
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239 /* TRUE if BFD should generate a "task linked" object file, |
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240 similar to relocatable but also with globals converted to |
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241 statics. */ |
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242 unsigned int task_link: 1; |
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243 |
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244 /* TRUE if BFD should generate a shared object. */ |
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245 unsigned int shared: 1; |
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246 |
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247 /* TRUE if BFD should pre-bind symbols in a shared object. */ |
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248 unsigned int symbolic: 1; |
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249 |
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250 /* TRUE if BFD should export all symbols in the dynamic symbol table |
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251 of an executable, rather than only those used. */ |
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252 unsigned int export_dynamic: 1; |
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253 |
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254 /* TRUE if shared objects should be linked directly, not shared. */ |
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255 unsigned int static_link: 1; |
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256 |
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257 /* TRUE if the output file should be in a traditional format. This |
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258 is equivalent to the setting of the BFD_TRADITIONAL_FORMAT flag |
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259 on the output file, but may be checked when reading the input |
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260 files. */ |
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261 unsigned int traditional_format: 1; |
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262 |
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263 /* TRUE if we want to produced optimized output files. This might |
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264 need much more time and therefore must be explicitly selected. */ |
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265 unsigned int optimize: 1; |
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266 |
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267 /* TRUE if ok to have multiple definition. */ |
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268 unsigned int allow_multiple_definition: 1; |
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269 |
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270 /* TRUE if ok to have version with no definition. */ |
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271 unsigned int allow_undefined_version: 1; |
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272 |
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273 /* TRUE if a default symbol version should be created and used for |
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274 exported symbols. */ |
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275 unsigned int create_default_symver: 1; |
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276 |
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277 /* TRUE if a default symbol version should be created and used for |
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278 imported symbols. */ |
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279 unsigned int default_imported_symver: 1; |
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280 |
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281 /* TRUE if symbols should be retained in memory, FALSE if they |
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282 should be freed and reread. */ |
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283 unsigned int keep_memory: 1; |
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284 |
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285 /* TRUE if every symbol should be reported back via the notice |
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286 callback. */ |
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287 unsigned int notice_all: 1; |
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288 |
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289 /* TRUE if executable should not contain copy relocs. |
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290 Setting this true may result in a non-sharable text segment. */ |
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291 unsigned int nocopyreloc: 1; |
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292 |
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293 /* TRUE if the new ELF dynamic tags are enabled. */ |
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294 unsigned int new_dtags: 1; |
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295 |
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296 /* TRUE if non-PLT relocs should be merged into one reloc section |
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297 and sorted so that relocs against the same symbol come together. */ |
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298 unsigned int combreloc: 1; |
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299 |
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300 /* TRUE if .eh_frame_hdr section and PT_GNU_EH_FRAME ELF segment |
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301 should be created. */ |
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302 unsigned int eh_frame_hdr: 1; |
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303 |
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304 /* TRUE if global symbols in discarded sections should be stripped. */ |
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305 unsigned int strip_discarded: 1; |
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306 |
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307 /* TRUE if generating a position independent executable. */ |
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308 unsigned int pie: 1; |
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309 |
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310 /* TRUE if generating an executable, position independent or not. */ |
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311 unsigned int executable : 1; |
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312 |
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313 /* TRUE if PT_GNU_STACK segment should be created with PF_R|PF_W|PF_X |
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314 flags. */ |
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315 unsigned int execstack: 1; |
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316 |
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317 /* TRUE if PT_GNU_STACK segment should be created with PF_R|PF_W |
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318 flags. */ |
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319 unsigned int noexecstack: 1; |
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320 |
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321 /* TRUE if PT_GNU_RELRO segment should be created. */ |
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322 unsigned int relro: 1; |
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323 |
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324 /* TRUE if we should warn when adding a DT_TEXTREL to a shared object. */ |
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325 unsigned int warn_shared_textrel: 1; |
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326 |
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327 /* TRUE if unreferenced sections should be removed. */ |
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328 unsigned int gc_sections: 1; |
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329 |
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330 /* TRUE if user shoudl be informed of removed unreferenced sections. */ |
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331 unsigned int print_gc_sections: 1; |
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332 |
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333 /* TRUE if .hash section should be created. */ |
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334 unsigned int emit_hash: 1; |
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335 |
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336 /* TRUE if .gnu.hash section should be created. */ |
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337 unsigned int emit_gnu_hash: 1; |
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338 |
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339 /* If TRUE reduce memory overheads, at the expense of speed. This will |
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340 cause map file generation to use an O(N^2) algorithm and disable |
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341 caching ELF symbol buffer. */ |
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342 unsigned int reduce_memory_overheads: 1; |
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343 |
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344 /* TRUE if all data symbols should be dynamic. */ |
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345 unsigned int dynamic_data: 1; |
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346 |
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347 /* TRUE if some symbols have to be dynamic, controlled by |
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348 --dynamic-list command line options. */ |
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349 unsigned int dynamic: 1; |
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350 |
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351 /* Non-NULL if .note.gnu.build-id section should be created. */ |
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352 char *emit_note_gnu_build_id; |
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353 |
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354 /* What to do with unresolved symbols in an object file. |
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355 When producing executables the default is GENERATE_ERROR. |
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356 When producing shared libraries the default is IGNORE. The |
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357 assumption with shared libraries is that the reference will be |
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358 resolved at load/execution time. */ |
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359 enum report_method unresolved_syms_in_objects; |
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360 |
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361 /* What to do with unresolved symbols in a shared library. |
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362 The same defaults apply. */ |
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363 enum report_method unresolved_syms_in_shared_libs; |
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364 |
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365 /* Which symbols to strip. */ |
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366 enum bfd_link_strip strip; |
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367 |
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368 /* Which local symbols to discard. */ |
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369 enum bfd_link_discard discard; |
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370 |
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371 /* Criteria for skipping symbols when detemining |
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372 whether to include an object from an archive. */ |
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373 enum bfd_link_common_skip_ar_aymbols common_skip_ar_aymbols; |
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374 |
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375 /* Char that may appear as the first char of a symbol, but should be |
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376 skipped (like symbol_leading_char) when looking up symbols in |
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377 wrap_hash. Used by PowerPC Linux for 'dot' symbols. */ |
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378 char wrap_char; |
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379 |
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380 /* Function callbacks. */ |
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381 const struct bfd_link_callbacks *callbacks; |
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382 |
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383 /* Hash table handled by BFD. */ |
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384 struct bfd_link_hash_table *hash; |
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385 |
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386 /* Hash table of symbols to keep. This is NULL unless strip is |
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387 strip_some. */ |
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388 struct bfd_hash_table *keep_hash; |
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389 |
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390 /* Hash table of symbols to report back via the notice callback. If |
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391 this is NULL, and notice_all is FALSE, then no symbols are |
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392 reported back. */ |
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393 struct bfd_hash_table *notice_hash; |
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394 |
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395 /* Hash table of symbols which are being wrapped (the --wrap linker |
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396 option). If this is NULL, no symbols are being wrapped. */ |
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397 struct bfd_hash_table *wrap_hash; |
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398 |
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399 /* The list of input BFD's involved in the link. These are chained |
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400 together via the link_next field. */ |
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401 bfd *input_bfds; |
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402 bfd **input_bfds_tail; |
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403 |
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404 /* If a symbol should be created for each input BFD, this is section |
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405 where those symbols should be placed. It must be a section in |
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406 the output BFD. It may be NULL, in which case no such symbols |
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407 will be created. This is to support CREATE_OBJECT_SYMBOLS in the |
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408 linker command language. */ |
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409 asection *create_object_symbols_section; |
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410 |
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411 /* List of global symbol names that are starting points for marking |
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412 sections against garbage collection. */ |
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413 struct bfd_sym_chain *gc_sym_list; |
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414 |
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415 /* If a base output file is wanted, then this points to it */ |
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416 void *base_file; |
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417 |
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418 /* The function to call when the executable or shared object is |
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419 loaded. */ |
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420 const char *init_function; |
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421 |
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422 /* The function to call when the executable or shared object is |
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423 unloaded. */ |
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424 const char *fini_function; |
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425 |
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426 /* Number of relaxation passes. Usually only one relaxation pass |
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427 is needed. But a backend can have as many relaxation passes as |
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428 necessary. During bfd_relax_section call, it is set to the |
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429 current pass, starting from 0. */ |
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430 int relax_pass; |
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431 |
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432 /* Number of relaxation trips. This number is incremented every |
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433 time the relaxation pass is restarted due to a previous |
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434 relaxation returning true in *AGAIN. */ |
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435 int relax_trip; |
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436 |
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437 /* Non-zero if auto-import thunks for DATA items in pei386 DLLs |
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438 should be generated/linked against. Set to 1 if this feature |
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439 is explicitly requested by the user, -1 if enabled by default. */ |
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440 int pei386_auto_import; |
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441 |
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442 /* Non-zero if runtime relocs for DATA items with non-zero addends |
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443 in pei386 DLLs should be generated. Set to 1 if this feature |
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444 is explicitly requested by the user, -1 if enabled by default. */ |
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445 int pei386_runtime_pseudo_reloc; |
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446 |
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447 /* How many spare .dynamic DT_NULL entries should be added? */ |
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448 unsigned int spare_dynamic_tags; |
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449 |
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450 /* May be used to set DT_FLAGS for ELF. */ |
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451 bfd_vma flags; |
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452 |
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453 /* May be used to set DT_FLAGS_1 for ELF. */ |
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454 bfd_vma flags_1; |
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455 |
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456 /* Start and end of RELRO region. */ |
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457 bfd_vma relro_start, relro_end; |
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458 |
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459 /* List of symbols should be dynamic. */ |
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460 struct bfd_elf_dynamic_list *dynamic_list; |
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461 }; |
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462 |
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463 /* This structures holds a set of callback functions. These are called |
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464 by the BFD linker routines. Except for the info functions, the first |
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465 argument to each callback function is the bfd_link_info structure |
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466 being used and each function returns a boolean value. If the |
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467 function returns FALSE, then the BFD function which called it should |
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468 return with a failure indication. */ |
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469 |
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470 struct bfd_link_callbacks |
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471 { |
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472 /* A function which is called when an object is added from an |
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473 archive. ABFD is the archive element being added. NAME is the |
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474 name of the symbol which caused the archive element to be pulled |
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475 in. */ |
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476 bfd_boolean (*add_archive_element) |
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477 (struct bfd_link_info *, bfd *abfd, const char *name); |
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478 /* A function which is called when a symbol is found with multiple |
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479 definitions. NAME is the symbol which is defined multiple times. |
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480 OBFD is the old BFD, OSEC is the old section, OVAL is the old |
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481 value, NBFD is the new BFD, NSEC is the new section, and NVAL is |
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482 the new value. OBFD may be NULL. OSEC and NSEC may be |
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483 bfd_com_section or bfd_ind_section. */ |
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484 bfd_boolean (*multiple_definition) |
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485 (struct bfd_link_info *, const char *name, |
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486 bfd *obfd, asection *osec, bfd_vma oval, |
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487 bfd *nbfd, asection *nsec, bfd_vma nval); |
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488 /* A function which is called when a common symbol is defined |
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489 multiple times. NAME is the symbol appearing multiple times. |
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490 OBFD is the BFD of the existing symbol; it may be NULL if this is |
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491 not known. OTYPE is the type of the existing symbol, which may |
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492 be bfd_link_hash_defined, bfd_link_hash_defweak, |
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493 bfd_link_hash_common, or bfd_link_hash_indirect. If OTYPE is |
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494 bfd_link_hash_common, OSIZE is the size of the existing symbol. |
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495 NBFD is the BFD of the new symbol. NTYPE is the type of the new |
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496 symbol, one of bfd_link_hash_defined, bfd_link_hash_common, or |
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497 bfd_link_hash_indirect. If NTYPE is bfd_link_hash_common, NSIZE |
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498 is the size of the new symbol. */ |
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499 bfd_boolean (*multiple_common) |
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500 (struct bfd_link_info *, const char *name, |
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501 bfd *obfd, enum bfd_link_hash_type otype, bfd_vma osize, |
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502 bfd *nbfd, enum bfd_link_hash_type ntype, bfd_vma nsize); |
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503 /* A function which is called to add a symbol to a set. ENTRY is |
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504 the link hash table entry for the set itself (e.g., |
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505 __CTOR_LIST__). RELOC is the relocation to use for an entry in |
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506 the set when generating a relocatable file, and is also used to |
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507 get the size of the entry when generating an executable file. |
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508 ABFD, SEC and VALUE identify the value to add to the set. */ |
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509 bfd_boolean (*add_to_set) |
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510 (struct bfd_link_info *, struct bfd_link_hash_entry *entry, |
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511 bfd_reloc_code_real_type reloc, bfd *abfd, asection *sec, bfd_vma value); |
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512 /* A function which is called when the name of a g++ constructor or |
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513 destructor is found. This is only called by some object file |
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514 formats. CONSTRUCTOR is TRUE for a constructor, FALSE for a |
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515 destructor. This will use BFD_RELOC_CTOR when generating a |
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516 relocatable file. NAME is the name of the symbol found. ABFD, |
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517 SECTION and VALUE are the value of the symbol. */ |
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518 bfd_boolean (*constructor) |
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519 (struct bfd_link_info *, bfd_boolean constructor, const char *name, |
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520 bfd *abfd, asection *sec, bfd_vma value); |
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521 /* A function which is called to issue a linker warning. For |
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522 example, this is called when there is a reference to a warning |
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523 symbol. WARNING is the warning to be issued. SYMBOL is the name |
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524 of the symbol which triggered the warning; it may be NULL if |
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525 there is none. ABFD, SECTION and ADDRESS identify the location |
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526 which trigerred the warning; either ABFD or SECTION or both may |
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527 be NULL if the location is not known. */ |
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528 bfd_boolean (*warning) |
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529 (struct bfd_link_info *, const char *warning, const char *symbol, |
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530 bfd *abfd, asection *section, bfd_vma address); |
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531 /* A function which is called when a relocation is attempted against |
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532 an undefined symbol. NAME is the symbol which is undefined. |
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533 ABFD, SECTION and ADDRESS identify the location from which the |
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534 reference is made. FATAL indicates whether an undefined symbol is |
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535 a fatal error or not. In some cases SECTION may be NULL. */ |
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536 bfd_boolean (*undefined_symbol) |
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537 (struct bfd_link_info *, const char *name, bfd *abfd, |
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538 asection *section, bfd_vma address, bfd_boolean fatal); |
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539 /* A function which is called when a reloc overflow occurs. ENTRY is |
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540 the link hash table entry for the symbol the reloc is against. |
|
541 NAME is the name of the local symbol or section the reloc is |
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542 against, RELOC_NAME is the name of the relocation, and ADDEND is |
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543 any addend that is used. ABFD, SECTION and ADDRESS identify the |
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544 location at which the overflow occurs; if this is the result of a |
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545 bfd_section_reloc_link_order or bfd_symbol_reloc_link_order, then |
|
546 ABFD will be NULL. */ |
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547 bfd_boolean (*reloc_overflow) |
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548 (struct bfd_link_info *, struct bfd_link_hash_entry *entry, |
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549 const char *name, const char *reloc_name, bfd_vma addend, |
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550 bfd *abfd, asection *section, bfd_vma address); |
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551 /* A function which is called when a dangerous reloc is performed. |
|
552 MESSAGE is an appropriate message. |
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553 ABFD, SECTION and ADDRESS identify the location at which the |
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554 problem occurred; if this is the result of a |
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555 bfd_section_reloc_link_order or bfd_symbol_reloc_link_order, then |
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556 ABFD will be NULL. */ |
|
557 bfd_boolean (*reloc_dangerous) |
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558 (struct bfd_link_info *, const char *message, |
|
559 bfd *abfd, asection *section, bfd_vma address); |
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560 /* A function which is called when a reloc is found to be attached |
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561 to a symbol which is not being written out. NAME is the name of |
|
562 the symbol. ABFD, SECTION and ADDRESS identify the location of |
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563 the reloc; if this is the result of a |
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564 bfd_section_reloc_link_order or bfd_symbol_reloc_link_order, then |
|
565 ABFD will be NULL. */ |
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566 bfd_boolean (*unattached_reloc) |
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567 (struct bfd_link_info *, const char *name, |
|
568 bfd *abfd, asection *section, bfd_vma address); |
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569 /* A function which is called when a symbol in notice_hash is |
|
570 defined or referenced. NAME is the symbol. ABFD, SECTION and |
|
571 ADDRESS are the value of the symbol. If SECTION is |
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572 bfd_und_section, this is a reference. */ |
|
573 bfd_boolean (*notice) |
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574 (struct bfd_link_info *, const char *name, |
|
575 bfd *abfd, asection *section, bfd_vma address); |
|
576 /* Error or warning link info message. */ |
|
577 void (*einfo) |
|
578 (const char *fmt, ...); |
|
579 /* General link info message. */ |
|
580 void (*info) |
|
581 (const char *fmt, ...); |
|
582 /* Message to be printed in linker map file. */ |
|
583 void (*minfo) |
|
584 (const char *fmt, ...); |
|
585 /* This callback provides a chance for users of the BFD library to |
|
586 override its decision about whether to place two adjacent sections |
|
587 into the same segment. */ |
|
588 bfd_boolean (*override_segment_assignment) |
|
589 (struct bfd_link_info *, bfd * abfd, |
|
590 asection * current_section, asection * previous_section, |
|
591 bfd_boolean new_segment); |
|
592 }; |
|
593 |
|
594 /* The linker builds link_order structures which tell the code how to |
|
595 include input data in the output file. */ |
|
596 |
|
597 /* These are the types of link_order structures. */ |
|
598 |
|
599 enum bfd_link_order_type |
|
600 { |
|
601 bfd_undefined_link_order, /* Undefined. */ |
|
602 bfd_indirect_link_order, /* Built from a section. */ |
|
603 bfd_data_link_order, /* Set to explicit data. */ |
|
604 bfd_section_reloc_link_order, /* Relocate against a section. */ |
|
605 bfd_symbol_reloc_link_order /* Relocate against a symbol. */ |
|
606 }; |
|
607 |
|
608 /* This is the link_order structure itself. These form a chain |
|
609 attached to the output section whose contents they are describing. */ |
|
610 |
|
611 struct bfd_link_order |
|
612 { |
|
613 /* Next link_order in chain. */ |
|
614 struct bfd_link_order *next; |
|
615 /* Type of link_order. */ |
|
616 enum bfd_link_order_type type; |
|
617 /* Offset within output section. */ |
|
618 bfd_vma offset; |
|
619 /* Size within output section. */ |
|
620 bfd_size_type size; |
|
621 /* Type specific information. */ |
|
622 union |
|
623 { |
|
624 struct |
|
625 { |
|
626 /* Section to include. If this is used, then |
|
627 section->output_section must be the section the |
|
628 link_order is attached to, section->output_offset must |
|
629 equal the link_order offset field, and section->size |
|
630 must equal the link_order size field. Maybe these |
|
631 restrictions should be relaxed someday. */ |
|
632 asection *section; |
|
633 } indirect; |
|
634 struct |
|
635 { |
|
636 /* Size of contents, or zero when contents size == size |
|
637 within output section. |
|
638 A non-zero value allows filling of the output section |
|
639 with an arbitrary repeated pattern. */ |
|
640 unsigned int size; |
|
641 /* Data to put into file. */ |
|
642 bfd_byte *contents; |
|
643 } data; |
|
644 struct |
|
645 { |
|
646 /* Description of reloc to generate. Used for |
|
647 bfd_section_reloc_link_order and |
|
648 bfd_symbol_reloc_link_order. */ |
|
649 struct bfd_link_order_reloc *p; |
|
650 } reloc; |
|
651 } u; |
|
652 }; |
|
653 |
|
654 /* A linker order of type bfd_section_reloc_link_order or |
|
655 bfd_symbol_reloc_link_order means to create a reloc against a |
|
656 section or symbol, respectively. This is used to implement -Ur to |
|
657 generate relocs for the constructor tables. The |
|
658 bfd_link_order_reloc structure describes the reloc that BFD should |
|
659 create. It is similar to a arelent, but I didn't use arelent |
|
660 because the linker does not know anything about most symbols, and |
|
661 any asymbol structure it creates will be partially meaningless. |
|
662 This information could logically be in the bfd_link_order struct, |
|
663 but I didn't want to waste the space since these types of relocs |
|
664 are relatively rare. */ |
|
665 |
|
666 struct bfd_link_order_reloc |
|
667 { |
|
668 /* Reloc type. */ |
|
669 bfd_reloc_code_real_type reloc; |
|
670 |
|
671 union |
|
672 { |
|
673 /* For type bfd_section_reloc_link_order, this is the section |
|
674 the reloc should be against. This must be a section in the |
|
675 output BFD, not any of the input BFDs. */ |
|
676 asection *section; |
|
677 /* For type bfd_symbol_reloc_link_order, this is the name of the |
|
678 symbol the reloc should be against. */ |
|
679 const char *name; |
|
680 } u; |
|
681 |
|
682 /* Addend to use. The object file should contain zero. The BFD |
|
683 backend is responsible for filling in the contents of the object |
|
684 file correctly. For some object file formats (e.g., COFF) the |
|
685 addend must be stored into in the object file, and for some |
|
686 (e.g., SPARC a.out) it is kept in the reloc. */ |
|
687 bfd_vma addend; |
|
688 }; |
|
689 |
|
690 /* Allocate a new link_order for a section. */ |
|
691 extern struct bfd_link_order *bfd_new_link_order (bfd *, asection *); |
|
692 |
|
693 /* These structures are used to describe version information for the |
|
694 ELF linker. These structures could be manipulated entirely inside |
|
695 BFD, but it would be a pain. Instead, the regular linker sets up |
|
696 these structures, and then passes them into BFD. */ |
|
697 |
|
698 /* Glob pattern for a version. */ |
|
699 |
|
700 struct bfd_elf_version_expr |
|
701 { |
|
702 /* Next glob pattern for this version. */ |
|
703 struct bfd_elf_version_expr *next; |
|
704 /* Glob pattern. */ |
|
705 const char *pattern; |
|
706 /* NULL for a glob pattern, otherwise a straight symbol. */ |
|
707 const char *symbol; |
|
708 /* Defined by ".symver". */ |
|
709 unsigned int symver : 1; |
|
710 /* Defined by version script. */ |
|
711 unsigned int script : 1; |
|
712 /* Pattern type. */ |
|
713 #define BFD_ELF_VERSION_C_TYPE 1 |
|
714 #define BFD_ELF_VERSION_CXX_TYPE 2 |
|
715 #define BFD_ELF_VERSION_JAVA_TYPE 4 |
|
716 unsigned int mask : 3; |
|
717 }; |
|
718 |
|
719 struct bfd_elf_version_expr_head |
|
720 { |
|
721 /* List of all patterns, both wildcards and non-wildcards. */ |
|
722 struct bfd_elf_version_expr *list; |
|
723 /* Hash table for non-wildcards. */ |
|
724 void *htab; |
|
725 /* Remaining patterns. */ |
|
726 struct bfd_elf_version_expr *remaining; |
|
727 /* What kind of pattern types are present in list (bitmask). */ |
|
728 unsigned int mask; |
|
729 }; |
|
730 |
|
731 /* Version dependencies. */ |
|
732 |
|
733 struct bfd_elf_version_deps |
|
734 { |
|
735 /* Next dependency for this version. */ |
|
736 struct bfd_elf_version_deps *next; |
|
737 /* The version which this version depends upon. */ |
|
738 struct bfd_elf_version_tree *version_needed; |
|
739 }; |
|
740 |
|
741 /* A node in the version tree. */ |
|
742 |
|
743 struct bfd_elf_version_tree |
|
744 { |
|
745 /* Next version. */ |
|
746 struct bfd_elf_version_tree *next; |
|
747 /* Name of this version. */ |
|
748 const char *name; |
|
749 /* Version number. */ |
|
750 unsigned int vernum; |
|
751 /* Regular expressions for global symbols in this version. */ |
|
752 struct bfd_elf_version_expr_head globals; |
|
753 /* Regular expressions for local symbols in this version. */ |
|
754 struct bfd_elf_version_expr_head locals; |
|
755 /* List of versions which this version depends upon. */ |
|
756 struct bfd_elf_version_deps *deps; |
|
757 /* Index of the version name. This is used within BFD. */ |
|
758 unsigned int name_indx; |
|
759 /* Whether this version tree was used. This is used within BFD. */ |
|
760 int used; |
|
761 /* Matching hook. */ |
|
762 struct bfd_elf_version_expr *(*match) |
|
763 (struct bfd_elf_version_expr_head *head, |
|
764 struct bfd_elf_version_expr *prev, const char *sym); |
|
765 }; |
|
766 |
|
767 struct bfd_elf_dynamic_list |
|
768 { |
|
769 struct bfd_elf_version_expr_head head; |
|
770 struct bfd_elf_version_expr *(*match) |
|
771 (struct bfd_elf_version_expr_head *head, |
|
772 struct bfd_elf_version_expr *prev, const char *sym); |
|
773 }; |
|
774 |
|
775 #endif |