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Rev | Author | Line No. | Line |
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5191 | serge | 1 | /* bfdlink.h -- header file for BFD link routines |
6324 | serge | 2 | Copyright (C) 1993-2015 Free Software Foundation, Inc. |
5191 | serge | 3 | Written by Steve Chamberlain and Ian Lance Taylor, Cygnus Support. |
4 | |||
5 | This file is part of BFD, the Binary File Descriptor library. |
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6 | |||
7 | This program is free software; you can redistribute it and/or modify |
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8 | it under the terms of the GNU General Public License as published by |
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9 | the Free Software Foundation; either version 3 of the License, or |
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10 | (at your option) any later version. |
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11 | |||
12 | This program is distributed in the hope that it will be useful, |
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13 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
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14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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15 | GNU General Public License for more details. |
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16 | |||
17 | You should have received a copy of the GNU General Public License |
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18 | along with this program; if not, write to the Free Software |
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19 | Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, |
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20 | MA 02110-1301, USA. */ |
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21 | |||
22 | #ifndef BFDLINK_H |
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23 | #define BFDLINK_H |
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24 | |||
25 | /* Which symbols to strip during a link. */ |
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26 | enum bfd_link_strip |
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27 | { |
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28 | strip_none, /* Don't strip any symbols. */ |
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29 | strip_debugger, /* Strip debugging symbols. */ |
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30 | strip_some, /* keep_hash is the list of symbols to keep. */ |
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31 | strip_all /* Strip all symbols. */ |
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32 | }; |
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33 | |||
34 | /* Which local symbols to discard during a link. This is irrelevant |
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35 | if strip_all is used. */ |
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36 | enum bfd_link_discard |
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37 | { |
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38 | discard_sec_merge, /* Discard local temporary symbols in SEC_MERGE |
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39 | sections. */ |
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40 | discard_none, /* Don't discard any locals. */ |
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41 | discard_l, /* Discard local temporary symbols. */ |
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42 | discard_all /* Discard all locals. */ |
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43 | }; |
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44 | |||
45 | /* Describes the type of hash table entry structure being used. |
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46 | Different hash table structure have different fields and so |
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47 | support different linking features. */ |
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48 | enum bfd_link_hash_table_type |
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49 | { |
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50 | bfd_link_generic_hash_table, |
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51 | bfd_link_elf_hash_table |
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52 | }; |
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53 | |||
54 | /* These are the possible types of an entry in the BFD link hash |
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55 | table. */ |
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56 | |||
57 | enum bfd_link_hash_type |
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58 | { |
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59 | bfd_link_hash_new, /* Symbol is new. */ |
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60 | bfd_link_hash_undefined, /* Symbol seen before, but undefined. */ |
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61 | bfd_link_hash_undefweak, /* Symbol is weak and undefined. */ |
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62 | bfd_link_hash_defined, /* Symbol is defined. */ |
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63 | bfd_link_hash_defweak, /* Symbol is weak and defined. */ |
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64 | bfd_link_hash_common, /* Symbol is common. */ |
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65 | bfd_link_hash_indirect, /* Symbol is an indirect link. */ |
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66 | bfd_link_hash_warning /* Like indirect, but warn if referenced. */ |
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67 | }; |
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68 | |||
69 | enum bfd_link_common_skip_ar_symbols |
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70 | { |
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71 | bfd_link_common_skip_none, |
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72 | bfd_link_common_skip_text, |
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73 | bfd_link_common_skip_data, |
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74 | bfd_link_common_skip_all |
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75 | }; |
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76 | |||
77 | struct bfd_link_hash_common_entry |
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78 | { |
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79 | unsigned int alignment_power; /* Alignment. */ |
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80 | asection *section; /* Symbol section. */ |
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81 | }; |
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82 | |||
83 | /* The linking routines use a hash table which uses this structure for |
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84 | its elements. */ |
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85 | |||
86 | struct bfd_link_hash_entry |
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87 | { |
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88 | /* Base hash table entry structure. */ |
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89 | struct bfd_hash_entry root; |
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90 | |||
91 | /* Type of this entry. */ |
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92 | ENUM_BITFIELD (bfd_link_hash_type) type : 8; |
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93 | |||
6324 | serge | 94 | /* Symbol is referenced in a normal object file, as distict from a LTO |
95 | IR object file. */ |
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5191 | serge | 96 | unsigned int non_ir_ref : 1; |
97 | |||
6324 | serge | 98 | /* Symbol is a built-in define. These will be overridden by PROVIDE |
99 | in a linker script. */ |
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100 | unsigned int linker_def : 1; |
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101 | |||
5191 | serge | 102 | /* A union of information depending upon the type. */ |
103 | union |
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104 | { |
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105 | /* Nothing is kept for bfd_hash_new. */ |
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106 | /* bfd_link_hash_undefined, bfd_link_hash_undefweak. */ |
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107 | struct |
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108 | { |
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109 | /* Undefined and common symbols are kept in a linked list through |
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110 | this field. This field is present in all of the union element |
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111 | so that we don't need to remove entries from the list when we |
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112 | change their type. Removing entries would either require the |
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113 | list to be doubly linked, which would waste more memory, or |
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114 | require a traversal. When an undefined or common symbol is |
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115 | created, it should be added to this list, the head of which is in |
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116 | the link hash table itself. As symbols are defined, they need |
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117 | not be removed from the list; anything which reads the list must |
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118 | doublecheck the symbol type. |
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119 | |||
120 | Weak symbols are not kept on this list. |
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121 | |||
122 | Defined and defweak symbols use this field as a reference marker. |
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123 | If the field is not NULL, or this structure is the tail of the |
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124 | undefined symbol list, the symbol has been referenced. If the |
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125 | symbol is undefined and becomes defined, this field will |
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126 | automatically be non-NULL since the symbol will have been on the |
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127 | undefined symbol list. */ |
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128 | struct bfd_link_hash_entry *next; |
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129 | bfd *abfd; /* BFD symbol was found in. */ |
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130 | } undef; |
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131 | /* bfd_link_hash_defined, bfd_link_hash_defweak. */ |
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132 | struct |
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133 | { |
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134 | struct bfd_link_hash_entry *next; |
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135 | asection *section; /* Symbol section. */ |
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136 | bfd_vma value; /* Symbol value. */ |
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137 | } def; |
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138 | /* bfd_link_hash_indirect, bfd_link_hash_warning. */ |
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139 | struct |
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140 | { |
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141 | struct bfd_link_hash_entry *next; |
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142 | struct bfd_link_hash_entry *link; /* Real symbol. */ |
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143 | const char *warning; /* Warning (bfd_link_hash_warning only). */ |
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144 | } i; |
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145 | /* bfd_link_hash_common. */ |
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146 | struct |
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147 | { |
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148 | struct bfd_link_hash_entry *next; |
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149 | /* The linker needs to know three things about common |
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150 | symbols: the size, the alignment, and the section in |
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151 | which the symbol should be placed. We store the size |
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152 | here, and we allocate a small structure to hold the |
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153 | section and the alignment. The alignment is stored as a |
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154 | power of two. We don't store all the information |
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155 | directly because we don't want to increase the size of |
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156 | the union; this structure is a major space user in the |
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157 | linker. */ |
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158 | struct bfd_link_hash_common_entry *p; |
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159 | bfd_size_type size; /* Common symbol size. */ |
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160 | } c; |
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161 | } u; |
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162 | }; |
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163 | |||
164 | /* This is the link hash table. It is a derived class of |
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165 | bfd_hash_table. */ |
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166 | |||
167 | struct bfd_link_hash_table |
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168 | { |
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169 | /* The hash table itself. */ |
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170 | struct bfd_hash_table table; |
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171 | /* A linked list of undefined and common symbols, linked through the |
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172 | next field in the bfd_link_hash_entry structure. */ |
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173 | struct bfd_link_hash_entry *undefs; |
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174 | /* Entries are added to the tail of the undefs list. */ |
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175 | struct bfd_link_hash_entry *undefs_tail; |
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6324 | serge | 176 | /* Function to free the hash table on closing BFD. */ |
177 | void (*hash_table_free) (bfd *); |
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5191 | serge | 178 | /* The type of the link hash table. */ |
179 | enum bfd_link_hash_table_type type; |
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180 | }; |
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181 | |||
182 | /* Look up an entry in a link hash table. If FOLLOW is TRUE, this |
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183 | follows bfd_link_hash_indirect and bfd_link_hash_warning links to |
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184 | the real symbol. */ |
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185 | extern struct bfd_link_hash_entry *bfd_link_hash_lookup |
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186 | (struct bfd_link_hash_table *, const char *, bfd_boolean create, |
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187 | bfd_boolean copy, bfd_boolean follow); |
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188 | |||
189 | /* Look up an entry in the main linker hash table if the symbol might |
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190 | be wrapped. This should only be used for references to an |
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191 | undefined symbol, not for definitions of a symbol. */ |
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192 | |||
193 | extern struct bfd_link_hash_entry *bfd_wrapped_link_hash_lookup |
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194 | (bfd *, struct bfd_link_info *, const char *, bfd_boolean, |
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195 | bfd_boolean, bfd_boolean); |
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196 | |||
6324 | serge | 197 | /* If H is a wrapped symbol, ie. the symbol name starts with "__wrap_" |
198 | and the remainder is found in wrap_hash, return the real symbol. */ |
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199 | |||
200 | extern struct bfd_link_hash_entry *unwrap_hash_lookup |
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201 | (struct bfd_link_info *, bfd *, struct bfd_link_hash_entry *); |
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202 | |||
5191 | serge | 203 | /* Traverse a link hash table. */ |
204 | extern void bfd_link_hash_traverse |
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205 | (struct bfd_link_hash_table *, |
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206 | bfd_boolean (*) (struct bfd_link_hash_entry *, void *), |
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207 | void *); |
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208 | |||
209 | /* Add an entry to the undefs list. */ |
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210 | extern void bfd_link_add_undef |
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211 | (struct bfd_link_hash_table *, struct bfd_link_hash_entry *); |
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212 | |||
213 | /* Remove symbols from the undefs list that don't belong there. */ |
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214 | extern void bfd_link_repair_undef_list |
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215 | (struct bfd_link_hash_table *table); |
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216 | |||
217 | /* Read symbols and cache symbol pointer array in outsymbols. */ |
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218 | extern bfd_boolean bfd_generic_link_read_symbols (bfd *); |
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219 | |||
220 | struct bfd_sym_chain |
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221 | { |
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222 | struct bfd_sym_chain *next; |
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223 | const char *name; |
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224 | }; |
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225 | |||
226 | /* How to handle unresolved symbols. |
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227 | There are four possibilities which are enumerated below: */ |
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228 | enum report_method |
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229 | { |
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230 | /* This is the initial value when then link_info structure is created. |
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231 | It allows the various stages of the linker to determine whether they |
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232 | allowed to set the value. */ |
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233 | RM_NOT_YET_SET = 0, |
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234 | RM_IGNORE, |
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235 | RM_GENERATE_WARNING, |
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236 | RM_GENERATE_ERROR |
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237 | }; |
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238 | |||
239 | typedef enum {with_flags, without_flags} flag_type; |
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240 | |||
241 | /* A section flag list. */ |
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242 | struct flag_info_list |
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243 | { |
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244 | flag_type with; |
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245 | const char *name; |
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246 | bfd_boolean valid; |
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247 | struct flag_info_list *next; |
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248 | }; |
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249 | |||
250 | /* Section flag info. */ |
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251 | struct flag_info |
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252 | { |
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253 | flagword only_with_flags; |
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254 | flagword not_with_flags; |
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255 | struct flag_info_list *flag_list; |
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256 | bfd_boolean flags_initialized; |
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257 | }; |
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258 | |||
259 | struct bfd_elf_dynamic_list; |
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260 | struct bfd_elf_version_tree; |
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261 | |||
6324 | serge | 262 | /* Types of output. */ |
263 | |||
264 | enum output_type |
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265 | { |
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266 | type_pde, |
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267 | type_pie, |
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268 | type_relocatable, |
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269 | type_dll, |
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270 | }; |
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271 | |||
272 | #define bfd_link_pde(info) ((info)->type == type_pde) |
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273 | #define bfd_link_dll(info) ((info)->type == type_dll) |
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274 | #define bfd_link_relocatable(info) ((info)->type == type_relocatable) |
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275 | #define bfd_link_pie(info) ((info)->type == type_pie) |
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276 | #define bfd_link_executable(info) (bfd_link_pde (info) || bfd_link_pie (info)) |
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277 | #define bfd_link_pic(info) (bfd_link_dll (info) || bfd_link_pie (info)) |
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278 | |||
5191 | serge | 279 | /* This structure holds all the information needed to communicate |
280 | between BFD and the linker when doing a link. */ |
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281 | |||
282 | struct bfd_link_info |
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283 | { |
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6324 | serge | 284 | /* Output type. */ |
285 | ENUM_BITFIELD (output_type) type : 2; |
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5191 | serge | 286 | |
287 | /* TRUE if BFD should pre-bind symbols in a shared object. */ |
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288 | unsigned int symbolic: 1; |
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289 | |||
290 | /* TRUE if executable should not contain copy relocs. |
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291 | Setting this true may result in a non-sharable text segment. */ |
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292 | unsigned int nocopyreloc: 1; |
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293 | |||
294 | /* TRUE if BFD should export all symbols in the dynamic symbol table |
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295 | of an executable, rather than only those used. */ |
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296 | unsigned int export_dynamic: 1; |
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297 | |||
298 | /* TRUE if a default symbol version should be created and used for |
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299 | exported symbols. */ |
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300 | unsigned int create_default_symver: 1; |
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301 | |||
302 | /* TRUE if unreferenced sections should be removed. */ |
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303 | unsigned int gc_sections: 1; |
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304 | |||
305 | /* TRUE if every symbol should be reported back via the notice |
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306 | callback. */ |
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307 | unsigned int notice_all: 1; |
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308 | |||
6324 | serge | 309 | /* TRUE if the LTO plugin is active. */ |
310 | unsigned int lto_plugin_active: 1; |
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5191 | serge | 311 | |
312 | /* TRUE if global symbols in discarded sections should be stripped. */ |
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313 | unsigned int strip_discarded: 1; |
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314 | |||
315 | /* TRUE if all data symbols should be dynamic. */ |
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316 | unsigned int dynamic_data: 1; |
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317 | |||
318 | /* Which symbols to strip. */ |
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319 | ENUM_BITFIELD (bfd_link_strip) strip : 2; |
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320 | |||
321 | /* Which local symbols to discard. */ |
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322 | ENUM_BITFIELD (bfd_link_discard) discard : 2; |
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323 | |||
324 | /* Criteria for skipping symbols when determining |
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325 | whether to include an object from an archive. */ |
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326 | ENUM_BITFIELD (bfd_link_common_skip_ar_symbols) common_skip_ar_symbols : 2; |
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327 | |||
328 | /* What to do with unresolved symbols in an object file. |
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329 | When producing executables the default is GENERATE_ERROR. |
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330 | When producing shared libraries the default is IGNORE. The |
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331 | assumption with shared libraries is that the reference will be |
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332 | resolved at load/execution time. */ |
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333 | ENUM_BITFIELD (report_method) unresolved_syms_in_objects : 2; |
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334 | |||
335 | /* What to do with unresolved symbols in a shared library. |
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336 | The same defaults apply. */ |
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337 | ENUM_BITFIELD (report_method) unresolved_syms_in_shared_libs : 2; |
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338 | |||
339 | /* TRUE if shared objects should be linked directly, not shared. */ |
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340 | unsigned int static_link: 1; |
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341 | |||
342 | /* TRUE if symbols should be retained in memory, FALSE if they |
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343 | should be freed and reread. */ |
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344 | unsigned int keep_memory: 1; |
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345 | |||
346 | /* TRUE if BFD should generate relocation information in the final |
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347 | executable. */ |
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348 | unsigned int emitrelocations: 1; |
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349 | |||
350 | /* TRUE if PT_GNU_RELRO segment should be created. */ |
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351 | unsigned int relro: 1; |
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352 | |||
6324 | serge | 353 | /* Nonzero if .eh_frame_hdr section and PT_GNU_EH_FRAME ELF segment |
354 | should be created. 1 for DWARF2 tables, 2 for compact tables. */ |
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355 | unsigned int eh_frame_hdr_type: 2; |
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5191 | serge | 356 | |
357 | /* TRUE if we should warn when adding a DT_TEXTREL to a shared object. */ |
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358 | unsigned int warn_shared_textrel: 1; |
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359 | |||
360 | /* TRUE if we should error when adding a DT_TEXTREL. */ |
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361 | unsigned int error_textrel: 1; |
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362 | |||
363 | /* TRUE if .hash section should be created. */ |
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364 | unsigned int emit_hash: 1; |
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365 | |||
366 | /* TRUE if .gnu.hash section should be created. */ |
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367 | unsigned int emit_gnu_hash: 1; |
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368 | |||
369 | /* If TRUE reduce memory overheads, at the expense of speed. This will |
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370 | cause map file generation to use an O(N^2) algorithm and disable |
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371 | caching ELF symbol buffer. */ |
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372 | unsigned int reduce_memory_overheads: 1; |
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373 | |||
374 | /* TRUE if the output file should be in a traditional format. This |
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375 | is equivalent to the setting of the BFD_TRADITIONAL_FORMAT flag |
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376 | on the output file, but may be checked when reading the input |
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377 | files. */ |
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378 | unsigned int traditional_format: 1; |
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379 | |||
380 | /* TRUE if non-PLT relocs should be merged into one reloc section |
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381 | and sorted so that relocs against the same symbol come together. */ |
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382 | unsigned int combreloc: 1; |
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383 | |||
384 | /* TRUE if a default symbol version should be created and used for |
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385 | imported symbols. */ |
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386 | unsigned int default_imported_symver: 1; |
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387 | |||
388 | /* TRUE if the new ELF dynamic tags are enabled. */ |
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389 | unsigned int new_dtags: 1; |
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390 | |||
391 | /* FALSE if .eh_frame unwind info should be generated for PLT and other |
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392 | linker created sections, TRUE if it should be omitted. */ |
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393 | unsigned int no_ld_generated_unwind_info: 1; |
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394 | |||
395 | /* TRUE if BFD should generate a "task linked" object file, |
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396 | similar to relocatable but also with globals converted to |
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397 | statics. */ |
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398 | unsigned int task_link: 1; |
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399 | |||
400 | /* TRUE if ok to have multiple definition. */ |
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401 | unsigned int allow_multiple_definition: 1; |
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402 | |||
403 | /* TRUE if ok to have version with no definition. */ |
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404 | unsigned int allow_undefined_version: 1; |
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405 | |||
406 | /* TRUE if some symbols have to be dynamic, controlled by |
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407 | --dynamic-list command line options. */ |
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408 | unsigned int dynamic: 1; |
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409 | |||
410 | /* TRUE if PT_GNU_STACK segment should be created with PF_R|PF_W|PF_X |
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411 | flags. */ |
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412 | unsigned int execstack: 1; |
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413 | |||
414 | /* TRUE if PT_GNU_STACK segment should be created with PF_R|PF_W |
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415 | flags. */ |
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416 | unsigned int noexecstack: 1; |
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417 | |||
418 | /* TRUE if we want to produced optimized output files. This might |
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419 | need much more time and therefore must be explicitly selected. */ |
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420 | unsigned int optimize: 1; |
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421 | |||
422 | /* TRUE if user should be informed of removed unreferenced sections. */ |
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423 | unsigned int print_gc_sections: 1; |
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424 | |||
425 | /* TRUE if we should warn alternate ELF machine code. */ |
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426 | unsigned int warn_alternate_em: 1; |
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427 | |||
428 | /* TRUE if the linker script contained an explicit PHDRS command. */ |
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429 | unsigned int user_phdrs: 1; |
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430 | |||
6324 | serge | 431 | /* TRUE if BND prefix in PLT entries is always generated. */ |
432 | unsigned int bndplt: 1; |
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433 | |||
434 | /* TRUE if generation of .interp/PT_INTERP should be suppressed. */ |
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435 | unsigned int nointerp: 1; |
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436 | |||
437 | /* TRUE if generate a 1-byte NOP as suffix for x86 call instruction. */ |
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438 | unsigned int call_nop_as_suffix : 1; |
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439 | |||
440 | /* The 1-byte NOP for x86 call instruction. */ |
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441 | char call_nop_byte; |
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442 | |||
5191 | serge | 443 | /* Char that may appear as the first char of a symbol, but should be |
444 | skipped (like symbol_leading_char) when looking up symbols in |
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445 | wrap_hash. Used by PowerPC Linux for 'dot' symbols. */ |
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446 | char wrap_char; |
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447 | |||
448 | /* Separator between archive and filename in linker script filespecs. */ |
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449 | char path_separator; |
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450 | |||
6324 | serge | 451 | /* Compress DWARF debug sections. */ |
452 | enum compressed_debug_section_type compress_debug; |
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453 | |||
5191 | serge | 454 | /* Default stack size. Zero means default (often zero itself), -1 |
455 | means explicitly zero-sized. */ |
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456 | bfd_signed_vma stacksize; |
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457 | |||
458 | /* Enable or disable target specific optimizations. |
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459 | |||
460 | Not all targets have optimizations to enable. |
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461 | |||
462 | Normally these optimizations are disabled by default but some targets |
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463 | prefer to enable them by default. So this field is a tri-state variable. |
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464 | The values are: |
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465 | |||
466 | zero: Enable the optimizations (either from --relax being specified on |
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467 | the command line or the backend's before_allocation emulation function. |
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468 | |||
469 | positive: The user has requested that these optimizations be disabled. |
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470 | (Via the --no-relax command line option). |
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471 | |||
472 | negative: The optimizations are disabled. (Set when initializing the |
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473 | args_type structure in ldmain.c:main. */ |
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474 | signed int disable_target_specific_optimizations; |
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475 | |||
476 | /* Function callbacks. */ |
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477 | const struct bfd_link_callbacks *callbacks; |
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478 | |||
479 | /* Hash table handled by BFD. */ |
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480 | struct bfd_link_hash_table *hash; |
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481 | |||
482 | /* Hash table of symbols to keep. This is NULL unless strip is |
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483 | strip_some. */ |
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484 | struct bfd_hash_table *keep_hash; |
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485 | |||
486 | /* Hash table of symbols to report back via the notice callback. If |
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487 | this is NULL, and notice_all is FALSE, then no symbols are |
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488 | reported back. */ |
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489 | struct bfd_hash_table *notice_hash; |
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490 | |||
491 | /* Hash table of symbols which are being wrapped (the --wrap linker |
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492 | option). If this is NULL, no symbols are being wrapped. */ |
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493 | struct bfd_hash_table *wrap_hash; |
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494 | |||
495 | /* Hash table of symbols which may be left unresolved during |
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496 | a link. If this is NULL, no symbols can be left unresolved. */ |
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497 | struct bfd_hash_table *ignore_hash; |
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498 | |||
499 | /* The output BFD. */ |
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500 | bfd *output_bfd; |
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501 | |||
502 | /* The list of input BFD's involved in the link. These are chained |
||
6324 | serge | 503 | together via the link.next field. */ |
5191 | serge | 504 | bfd *input_bfds; |
505 | bfd **input_bfds_tail; |
||
506 | |||
507 | /* If a symbol should be created for each input BFD, this is section |
||
508 | where those symbols should be placed. It must be a section in |
||
509 | the output BFD. It may be NULL, in which case no such symbols |
||
510 | will be created. This is to support CREATE_OBJECT_SYMBOLS in the |
||
511 | linker command language. */ |
||
512 | asection *create_object_symbols_section; |
||
513 | |||
514 | /* List of global symbol names that are starting points for marking |
||
515 | sections against garbage collection. */ |
||
516 | struct bfd_sym_chain *gc_sym_list; |
||
517 | |||
518 | /* If a base output file is wanted, then this points to it */ |
||
519 | void *base_file; |
||
520 | |||
521 | /* The function to call when the executable or shared object is |
||
522 | loaded. */ |
||
523 | const char *init_function; |
||
524 | |||
525 | /* The function to call when the executable or shared object is |
||
526 | unloaded. */ |
||
527 | const char *fini_function; |
||
528 | |||
529 | /* Number of relaxation passes. Usually only one relaxation pass |
||
530 | is needed. But a backend can have as many relaxation passes as |
||
531 | necessary. During bfd_relax_section call, it is set to the |
||
532 | current pass, starting from 0. */ |
||
533 | int relax_pass; |
||
534 | |||
535 | /* Number of relaxation trips. This number is incremented every |
||
536 | time the relaxation pass is restarted due to a previous |
||
537 | relaxation returning true in *AGAIN. */ |
||
538 | int relax_trip; |
||
539 | |||
6324 | serge | 540 | /* > 0 to treat protected data defined in the shared library as |
541 | reference external. 0 to treat it as internal. -1 to let |
||
542 | backend to decide. */ |
||
543 | int extern_protected_data; |
||
544 | |||
5191 | serge | 545 | /* Non-zero if auto-import thunks for DATA items in pei386 DLLs |
546 | should be generated/linked against. Set to 1 if this feature |
||
547 | is explicitly requested by the user, -1 if enabled by default. */ |
||
548 | int pei386_auto_import; |
||
549 | |||
550 | /* Non-zero if runtime relocs for DATA items with non-zero addends |
||
551 | in pei386 DLLs should be generated. Set to 1 if this feature |
||
552 | is explicitly requested by the user, -1 if enabled by default. */ |
||
553 | int pei386_runtime_pseudo_reloc; |
||
554 | |||
555 | /* How many spare .dynamic DT_NULL entries should be added? */ |
||
556 | unsigned int spare_dynamic_tags; |
||
557 | |||
558 | /* May be used to set DT_FLAGS for ELF. */ |
||
559 | bfd_vma flags; |
||
560 | |||
561 | /* May be used to set DT_FLAGS_1 for ELF. */ |
||
562 | bfd_vma flags_1; |
||
563 | |||
564 | /* Start and end of RELRO region. */ |
||
565 | bfd_vma relro_start, relro_end; |
||
566 | |||
567 | /* List of symbols should be dynamic. */ |
||
568 | struct bfd_elf_dynamic_list *dynamic_list; |
||
569 | |||
570 | /* The version information. */ |
||
571 | struct bfd_elf_version_tree *version_info; |
||
572 | }; |
||
573 | |||
574 | /* This structures holds a set of callback functions. These are called |
||
575 | by the BFD linker routines. Except for the info functions, the first |
||
576 | argument to each callback function is the bfd_link_info structure |
||
577 | being used and each function returns a boolean value. If the |
||
578 | function returns FALSE, then the BFD function which called it should |
||
579 | return with a failure indication. */ |
||
580 | |||
581 | struct bfd_link_callbacks |
||
582 | { |
||
583 | /* A function which is called when an object is added from an |
||
584 | archive. ABFD is the archive element being added. NAME is the |
||
585 | name of the symbol which caused the archive element to be pulled |
||
586 | in. This function may set *SUBSBFD to point to an alternative |
||
587 | BFD from which symbols should in fact be added in place of the |
||
588 | original BFD's symbols. */ |
||
589 | bfd_boolean (*add_archive_element) |
||
590 | (struct bfd_link_info *, bfd *abfd, const char *name, bfd **subsbfd); |
||
591 | /* A function which is called when a symbol is found with multiple |
||
592 | definitions. H is the symbol which is defined multiple times. |
||
593 | NBFD is the new BFD, NSEC is the new section, and NVAL is the new |
||
594 | value. NSEC may be bfd_com_section or bfd_ind_section. */ |
||
595 | bfd_boolean (*multiple_definition) |
||
596 | (struct bfd_link_info *, struct bfd_link_hash_entry *h, |
||
597 | bfd *nbfd, asection *nsec, bfd_vma nval); |
||
598 | /* A function which is called when a common symbol is defined |
||
599 | multiple times. H is the symbol appearing multiple times. |
||
600 | NBFD is the BFD of the new symbol. NTYPE is the type of the new |
||
601 | symbol, one of bfd_link_hash_defined, bfd_link_hash_common, or |
||
602 | bfd_link_hash_indirect. If NTYPE is bfd_link_hash_common, NSIZE |
||
603 | is the size of the new symbol. */ |
||
604 | bfd_boolean (*multiple_common) |
||
605 | (struct bfd_link_info *, struct bfd_link_hash_entry *h, |
||
606 | bfd *nbfd, enum bfd_link_hash_type ntype, bfd_vma nsize); |
||
607 | /* A function which is called to add a symbol to a set. ENTRY is |
||
608 | the link hash table entry for the set itself (e.g., |
||
609 | __CTOR_LIST__). RELOC is the relocation to use for an entry in |
||
610 | the set when generating a relocatable file, and is also used to |
||
611 | get the size of the entry when generating an executable file. |
||
612 | ABFD, SEC and VALUE identify the value to add to the set. */ |
||
613 | bfd_boolean (*add_to_set) |
||
614 | (struct bfd_link_info *, struct bfd_link_hash_entry *entry, |
||
615 | bfd_reloc_code_real_type reloc, bfd *abfd, asection *sec, bfd_vma value); |
||
616 | /* A function which is called when the name of a g++ constructor or |
||
617 | destructor is found. This is only called by some object file |
||
618 | formats. CONSTRUCTOR is TRUE for a constructor, FALSE for a |
||
619 | destructor. This will use BFD_RELOC_CTOR when generating a |
||
620 | relocatable file. NAME is the name of the symbol found. ABFD, |
||
621 | SECTION and VALUE are the value of the symbol. */ |
||
622 | bfd_boolean (*constructor) |
||
623 | (struct bfd_link_info *, bfd_boolean constructor, const char *name, |
||
624 | bfd *abfd, asection *sec, bfd_vma value); |
||
625 | /* A function which is called to issue a linker warning. For |
||
626 | example, this is called when there is a reference to a warning |
||
627 | symbol. WARNING is the warning to be issued. SYMBOL is the name |
||
628 | of the symbol which triggered the warning; it may be NULL if |
||
629 | there is none. ABFD, SECTION and ADDRESS identify the location |
||
630 | which trigerred the warning; either ABFD or SECTION or both may |
||
631 | be NULL if the location is not known. */ |
||
632 | bfd_boolean (*warning) |
||
633 | (struct bfd_link_info *, const char *warning, const char *symbol, |
||
634 | bfd *abfd, asection *section, bfd_vma address); |
||
635 | /* A function which is called when a relocation is attempted against |
||
636 | an undefined symbol. NAME is the symbol which is undefined. |
||
637 | ABFD, SECTION and ADDRESS identify the location from which the |
||
638 | reference is made. IS_FATAL indicates whether an undefined symbol is |
||
639 | a fatal error or not. In some cases SECTION may be NULL. */ |
||
640 | bfd_boolean (*undefined_symbol) |
||
641 | (struct bfd_link_info *, const char *name, bfd *abfd, |
||
642 | asection *section, bfd_vma address, bfd_boolean is_fatal); |
||
643 | /* A function which is called when a reloc overflow occurs. ENTRY is |
||
644 | the link hash table entry for the symbol the reloc is against. |
||
645 | NAME is the name of the local symbol or section the reloc is |
||
646 | against, RELOC_NAME is the name of the relocation, and ADDEND is |
||
647 | any addend that is used. ABFD, SECTION and ADDRESS identify the |
||
648 | location at which the overflow occurs; if this is the result of a |
||
649 | bfd_section_reloc_link_order or bfd_symbol_reloc_link_order, then |
||
650 | ABFD will be NULL. */ |
||
651 | bfd_boolean (*reloc_overflow) |
||
652 | (struct bfd_link_info *, struct bfd_link_hash_entry *entry, |
||
653 | const char *name, const char *reloc_name, bfd_vma addend, |
||
654 | bfd *abfd, asection *section, bfd_vma address); |
||
655 | /* A function which is called when a dangerous reloc is performed. |
||
656 | MESSAGE is an appropriate message. |
||
657 | ABFD, SECTION and ADDRESS identify the location at which the |
||
658 | problem occurred; if this is the result of a |
||
659 | bfd_section_reloc_link_order or bfd_symbol_reloc_link_order, then |
||
660 | ABFD will be NULL. */ |
||
661 | bfd_boolean (*reloc_dangerous) |
||
662 | (struct bfd_link_info *, const char *message, |
||
663 | bfd *abfd, asection *section, bfd_vma address); |
||
664 | /* A function which is called when a reloc is found to be attached |
||
665 | to a symbol which is not being written out. NAME is the name of |
||
666 | the symbol. ABFD, SECTION and ADDRESS identify the location of |
||
667 | the reloc; if this is the result of a |
||
668 | bfd_section_reloc_link_order or bfd_symbol_reloc_link_order, then |
||
669 | ABFD will be NULL. */ |
||
670 | bfd_boolean (*unattached_reloc) |
||
671 | (struct bfd_link_info *, const char *name, |
||
672 | bfd *abfd, asection *section, bfd_vma address); |
||
673 | /* A function which is called when a symbol in notice_hash is |
||
6324 | serge | 674 | defined or referenced. H is the symbol, INH the indirect symbol |
675 | if applicable. ABFD, SECTION and ADDRESS are the (new) value of |
||
676 | the symbol. If SECTION is bfd_und_section, this is a reference. |
||
677 | FLAGS are the symbol BSF_* flags. */ |
||
5191 | serge | 678 | bfd_boolean (*notice) |
679 | (struct bfd_link_info *, struct bfd_link_hash_entry *h, |
||
6324 | serge | 680 | struct bfd_link_hash_entry *inh, |
681 | bfd *abfd, asection *section, bfd_vma address, flagword flags); |
||
5191 | serge | 682 | /* Error or warning link info message. */ |
683 | void (*einfo) |
||
684 | (const char *fmt, ...); |
||
685 | /* General link info message. */ |
||
686 | void (*info) |
||
687 | (const char *fmt, ...); |
||
688 | /* Message to be printed in linker map file. */ |
||
689 | void (*minfo) |
||
690 | (const char *fmt, ...); |
||
691 | /* This callback provides a chance for users of the BFD library to |
||
692 | override its decision about whether to place two adjacent sections |
||
693 | into the same segment. */ |
||
694 | bfd_boolean (*override_segment_assignment) |
||
695 | (struct bfd_link_info *, bfd * abfd, |
||
696 | asection * current_section, asection * previous_section, |
||
697 | bfd_boolean new_segment); |
||
698 | }; |
||
699 | |||
700 | /* The linker builds link_order structures which tell the code how to |
||
701 | include input data in the output file. */ |
||
702 | |||
703 | /* These are the types of link_order structures. */ |
||
704 | |||
705 | enum bfd_link_order_type |
||
706 | { |
||
707 | bfd_undefined_link_order, /* Undefined. */ |
||
708 | bfd_indirect_link_order, /* Built from a section. */ |
||
709 | bfd_data_link_order, /* Set to explicit data. */ |
||
710 | bfd_section_reloc_link_order, /* Relocate against a section. */ |
||
711 | bfd_symbol_reloc_link_order /* Relocate against a symbol. */ |
||
712 | }; |
||
713 | |||
714 | /* This is the link_order structure itself. These form a chain |
||
715 | attached to the output section whose contents they are describing. */ |
||
716 | |||
717 | struct bfd_link_order |
||
718 | { |
||
719 | /* Next link_order in chain. */ |
||
720 | struct bfd_link_order *next; |
||
721 | /* Type of link_order. */ |
||
722 | enum bfd_link_order_type type; |
||
723 | /* Offset within output section. */ |
||
724 | bfd_vma offset; |
||
725 | /* Size within output section. */ |
||
726 | bfd_size_type size; |
||
727 | /* Type specific information. */ |
||
728 | union |
||
729 | { |
||
730 | struct |
||
731 | { |
||
732 | /* Section to include. If this is used, then |
||
733 | section->output_section must be the section the |
||
734 | link_order is attached to, section->output_offset must |
||
735 | equal the link_order offset field, and section->size |
||
736 | must equal the link_order size field. Maybe these |
||
737 | restrictions should be relaxed someday. */ |
||
738 | asection *section; |
||
739 | } indirect; |
||
740 | struct |
||
741 | { |
||
742 | /* Size of contents, or zero when contents should be filled by |
||
743 | the architecture-dependent fill function. |
||
744 | A non-zero value allows filling of the output section |
||
745 | with an arbitrary repeated pattern. */ |
||
746 | unsigned int size; |
||
747 | /* Data to put into file. */ |
||
748 | bfd_byte *contents; |
||
749 | } data; |
||
750 | struct |
||
751 | { |
||
752 | /* Description of reloc to generate. Used for |
||
753 | bfd_section_reloc_link_order and |
||
754 | bfd_symbol_reloc_link_order. */ |
||
755 | struct bfd_link_order_reloc *p; |
||
756 | } reloc; |
||
757 | } u; |
||
758 | }; |
||
759 | |||
760 | /* A linker order of type bfd_section_reloc_link_order or |
||
761 | bfd_symbol_reloc_link_order means to create a reloc against a |
||
762 | section or symbol, respectively. This is used to implement -Ur to |
||
763 | generate relocs for the constructor tables. The |
||
764 | bfd_link_order_reloc structure describes the reloc that BFD should |
||
765 | create. It is similar to a arelent, but I didn't use arelent |
||
766 | because the linker does not know anything about most symbols, and |
||
767 | any asymbol structure it creates will be partially meaningless. |
||
768 | This information could logically be in the bfd_link_order struct, |
||
769 | but I didn't want to waste the space since these types of relocs |
||
770 | are relatively rare. */ |
||
771 | |||
772 | struct bfd_link_order_reloc |
||
773 | { |
||
774 | /* Reloc type. */ |
||
775 | bfd_reloc_code_real_type reloc; |
||
776 | |||
777 | union |
||
778 | { |
||
779 | /* For type bfd_section_reloc_link_order, this is the section |
||
780 | the reloc should be against. This must be a section in the |
||
781 | output BFD, not any of the input BFDs. */ |
||
782 | asection *section; |
||
783 | /* For type bfd_symbol_reloc_link_order, this is the name of the |
||
784 | symbol the reloc should be against. */ |
||
785 | const char *name; |
||
786 | } u; |
||
787 | |||
788 | /* Addend to use. The object file should contain zero. The BFD |
||
789 | backend is responsible for filling in the contents of the object |
||
790 | file correctly. For some object file formats (e.g., COFF) the |
||
791 | addend must be stored into in the object file, and for some |
||
792 | (e.g., SPARC a.out) it is kept in the reloc. */ |
||
793 | bfd_vma addend; |
||
794 | }; |
||
795 | |||
796 | /* Allocate a new link_order for a section. */ |
||
797 | extern struct bfd_link_order *bfd_new_link_order (bfd *, asection *); |
||
798 | |||
799 | /* These structures are used to describe version information for the |
||
800 | ELF linker. These structures could be manipulated entirely inside |
||
801 | BFD, but it would be a pain. Instead, the regular linker sets up |
||
802 | these structures, and then passes them into BFD. */ |
||
803 | |||
804 | /* Glob pattern for a version. */ |
||
805 | |||
806 | struct bfd_elf_version_expr |
||
807 | { |
||
808 | /* Next glob pattern for this version. */ |
||
809 | struct bfd_elf_version_expr *next; |
||
810 | /* Glob pattern. */ |
||
811 | const char *pattern; |
||
812 | /* Set if pattern is not a glob. */ |
||
813 | unsigned int literal : 1; |
||
814 | /* Defined by ".symver". */ |
||
815 | unsigned int symver : 1; |
||
816 | /* Defined by version script. */ |
||
817 | unsigned int script : 1; |
||
818 | /* Pattern type. */ |
||
819 | #define BFD_ELF_VERSION_C_TYPE 1 |
||
820 | #define BFD_ELF_VERSION_CXX_TYPE 2 |
||
821 | #define BFD_ELF_VERSION_JAVA_TYPE 4 |
||
822 | unsigned int mask : 3; |
||
823 | }; |
||
824 | |||
825 | struct bfd_elf_version_expr_head |
||
826 | { |
||
827 | /* List of all patterns, both wildcards and non-wildcards. */ |
||
828 | struct bfd_elf_version_expr *list; |
||
829 | /* Hash table for non-wildcards. */ |
||
830 | void *htab; |
||
831 | /* Remaining patterns. */ |
||
832 | struct bfd_elf_version_expr *remaining; |
||
833 | /* What kind of pattern types are present in list (bitmask). */ |
||
834 | unsigned int mask; |
||
835 | }; |
||
836 | |||
837 | /* Version dependencies. */ |
||
838 | |||
839 | struct bfd_elf_version_deps |
||
840 | { |
||
841 | /* Next dependency for this version. */ |
||
842 | struct bfd_elf_version_deps *next; |
||
843 | /* The version which this version depends upon. */ |
||
844 | struct bfd_elf_version_tree *version_needed; |
||
845 | }; |
||
846 | |||
847 | /* A node in the version tree. */ |
||
848 | |||
849 | struct bfd_elf_version_tree |
||
850 | { |
||
851 | /* Next version. */ |
||
852 | struct bfd_elf_version_tree *next; |
||
853 | /* Name of this version. */ |
||
854 | const char *name; |
||
855 | /* Version number. */ |
||
856 | unsigned int vernum; |
||
857 | /* Regular expressions for global symbols in this version. */ |
||
858 | struct bfd_elf_version_expr_head globals; |
||
859 | /* Regular expressions for local symbols in this version. */ |
||
860 | struct bfd_elf_version_expr_head locals; |
||
861 | /* List of versions which this version depends upon. */ |
||
862 | struct bfd_elf_version_deps *deps; |
||
863 | /* Index of the version name. This is used within BFD. */ |
||
864 | unsigned int name_indx; |
||
865 | /* Whether this version tree was used. This is used within BFD. */ |
||
866 | int used; |
||
867 | /* Matching hook. */ |
||
868 | struct bfd_elf_version_expr *(*match) |
||
869 | (struct bfd_elf_version_expr_head *head, |
||
870 | struct bfd_elf_version_expr *prev, const char *sym); |
||
871 | }; |
||
872 | |||
873 | struct bfd_elf_dynamic_list |
||
874 | { |
||
875 | struct bfd_elf_version_expr_head head; |
||
876 | struct bfd_elf_version_expr *(*match) |
||
877 | (struct bfd_elf_version_expr_head *head, |
||
878 | struct bfd_elf_version_expr *prev, const char *sym); |
||
879 | }; |
||
880 | |||
881 | #endif |