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5191 | serge | 1 | /* bfdlink.h -- header file for BFD link routines |
2 | Copyright 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, |
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3 | 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011 |
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4 | Free Software Foundation, Inc. |
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5 | Written by Steve Chamberlain and Ian Lance Taylor, Cygnus Support. |
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6 | |||
7 | This file is part of BFD, the Binary File Descriptor library. |
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8 | |||
9 | This program is free software; you can redistribute it and/or modify |
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10 | it under the terms of the GNU General Public License as published by |
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11 | the Free Software Foundation; either version 3 of the License, or |
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12 | (at your option) any later version. |
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13 | |||
14 | This program is distributed in the hope that it will be useful, |
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15 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
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16 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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17 | GNU General Public License for more details. |
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18 | |||
19 | You should have received a copy of the GNU General Public License |
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20 | along with this program; if not, write to the Free Software |
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21 | Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, |
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22 | MA 02110-1301, USA. */ |
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23 | |||
24 | #ifndef BFDLINK_H |
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25 | #define BFDLINK_H |
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26 | |||
27 | /* Which symbols to strip during a link. */ |
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28 | enum bfd_link_strip |
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29 | { |
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30 | strip_none, /* Don't strip any symbols. */ |
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31 | strip_debugger, /* Strip debugging symbols. */ |
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32 | strip_some, /* keep_hash is the list of symbols to keep. */ |
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33 | strip_all /* Strip all symbols. */ |
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34 | }; |
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35 | |||
36 | /* Which local symbols to discard during a link. This is irrelevant |
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37 | if strip_all is used. */ |
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38 | enum bfd_link_discard |
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39 | { |
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40 | discard_sec_merge, /* Discard local temporary symbols in SEC_MERGE |
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41 | sections. */ |
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42 | discard_none, /* Don't discard any locals. */ |
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43 | discard_l, /* Discard local temporary symbols. */ |
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44 | discard_all /* Discard all locals. */ |
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45 | }; |
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46 | |||
47 | /* Describes the type of hash table entry structure being used. |
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48 | Different hash table structure have different fields and so |
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49 | support different linking features. */ |
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50 | enum bfd_link_hash_table_type |
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51 | { |
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52 | bfd_link_generic_hash_table, |
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53 | bfd_link_elf_hash_table |
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54 | }; |
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55 | |||
56 | /* These are the possible types of an entry in the BFD link hash |
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57 | table. */ |
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58 | |||
59 | enum bfd_link_hash_type |
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60 | { |
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61 | bfd_link_hash_new, /* Symbol is new. */ |
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62 | bfd_link_hash_undefined, /* Symbol seen before, but undefined. */ |
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63 | bfd_link_hash_undefweak, /* Symbol is weak and undefined. */ |
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64 | bfd_link_hash_defined, /* Symbol is defined. */ |
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65 | bfd_link_hash_defweak, /* Symbol is weak and defined. */ |
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66 | bfd_link_hash_common, /* Symbol is common. */ |
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67 | bfd_link_hash_indirect, /* Symbol is an indirect link. */ |
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68 | bfd_link_hash_warning /* Like indirect, but warn if referenced. */ |
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69 | }; |
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70 | |||
71 | enum bfd_link_common_skip_ar_symbols |
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72 | { |
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73 | bfd_link_common_skip_none, |
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74 | bfd_link_common_skip_text, |
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75 | bfd_link_common_skip_data, |
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76 | bfd_link_common_skip_all |
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77 | }; |
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78 | |||
79 | struct bfd_link_hash_common_entry |
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80 | { |
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81 | unsigned int alignment_power; /* Alignment. */ |
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82 | asection *section; /* Symbol section. */ |
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83 | }; |
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84 | |||
85 | /* The linking routines use a hash table which uses this structure for |
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86 | its elements. */ |
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87 | |||
88 | struct bfd_link_hash_entry |
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89 | { |
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90 | /* Base hash table entry structure. */ |
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91 | struct bfd_hash_entry root; |
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92 | |||
93 | /* Type of this entry. */ |
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94 | ENUM_BITFIELD (bfd_link_hash_type) type : 8; |
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95 | |||
96 | unsigned int non_ir_ref : 1; |
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97 | |||
98 | /* A union of information depending upon the type. */ |
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99 | union |
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100 | { |
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101 | /* Nothing is kept for bfd_hash_new. */ |
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102 | /* bfd_link_hash_undefined, bfd_link_hash_undefweak. */ |
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103 | struct |
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104 | { |
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105 | /* Undefined and common symbols are kept in a linked list through |
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106 | this field. This field is present in all of the union element |
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107 | so that we don't need to remove entries from the list when we |
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108 | change their type. Removing entries would either require the |
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109 | list to be doubly linked, which would waste more memory, or |
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110 | require a traversal. When an undefined or common symbol is |
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111 | created, it should be added to this list, the head of which is in |
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112 | the link hash table itself. As symbols are defined, they need |
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113 | not be removed from the list; anything which reads the list must |
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114 | doublecheck the symbol type. |
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115 | |||
116 | Weak symbols are not kept on this list. |
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117 | |||
118 | Defined and defweak symbols use this field as a reference marker. |
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119 | If the field is not NULL, or this structure is the tail of the |
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120 | undefined symbol list, the symbol has been referenced. If the |
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121 | symbol is undefined and becomes defined, this field will |
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122 | automatically be non-NULL since the symbol will have been on the |
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123 | undefined symbol list. */ |
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124 | struct bfd_link_hash_entry *next; |
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125 | bfd *abfd; /* BFD symbol was found in. */ |
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126 | } undef; |
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127 | /* bfd_link_hash_defined, bfd_link_hash_defweak. */ |
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128 | struct |
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129 | { |
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130 | struct bfd_link_hash_entry *next; |
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131 | asection *section; /* Symbol section. */ |
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132 | bfd_vma value; /* Symbol value. */ |
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133 | } def; |
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134 | /* bfd_link_hash_indirect, bfd_link_hash_warning. */ |
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135 | struct |
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136 | { |
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137 | struct bfd_link_hash_entry *next; |
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138 | struct bfd_link_hash_entry *link; /* Real symbol. */ |
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139 | const char *warning; /* Warning (bfd_link_hash_warning only). */ |
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140 | } i; |
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141 | /* bfd_link_hash_common. */ |
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142 | struct |
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143 | { |
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144 | struct bfd_link_hash_entry *next; |
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145 | /* The linker needs to know three things about common |
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146 | symbols: the size, the alignment, and the section in |
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147 | which the symbol should be placed. We store the size |
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148 | here, and we allocate a small structure to hold the |
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149 | section and the alignment. The alignment is stored as a |
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150 | power of two. We don't store all the information |
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151 | directly because we don't want to increase the size of |
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152 | the union; this structure is a major space user in the |
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153 | linker. */ |
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154 | struct bfd_link_hash_common_entry *p; |
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155 | bfd_size_type size; /* Common symbol size. */ |
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156 | } c; |
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157 | } u; |
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158 | }; |
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159 | |||
160 | /* This is the link hash table. It is a derived class of |
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161 | bfd_hash_table. */ |
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162 | |||
163 | struct bfd_link_hash_table |
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164 | { |
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165 | /* The hash table itself. */ |
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166 | struct bfd_hash_table table; |
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167 | /* A linked list of undefined and common symbols, linked through the |
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168 | next field in the bfd_link_hash_entry structure. */ |
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169 | struct bfd_link_hash_entry *undefs; |
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170 | /* Entries are added to the tail of the undefs list. */ |
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171 | struct bfd_link_hash_entry *undefs_tail; |
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172 | /* The type of the link hash table. */ |
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173 | enum bfd_link_hash_table_type type; |
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174 | }; |
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175 | |||
176 | /* Look up an entry in a link hash table. If FOLLOW is TRUE, this |
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177 | follows bfd_link_hash_indirect and bfd_link_hash_warning links to |
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178 | the real symbol. */ |
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179 | extern struct bfd_link_hash_entry *bfd_link_hash_lookup |
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180 | (struct bfd_link_hash_table *, const char *, bfd_boolean create, |
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181 | bfd_boolean copy, bfd_boolean follow); |
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182 | |||
183 | /* Look up an entry in the main linker hash table if the symbol might |
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184 | be wrapped. This should only be used for references to an |
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185 | undefined symbol, not for definitions of a symbol. */ |
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186 | |||
187 | extern struct bfd_link_hash_entry *bfd_wrapped_link_hash_lookup |
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188 | (bfd *, struct bfd_link_info *, const char *, bfd_boolean, |
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189 | bfd_boolean, bfd_boolean); |
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190 | |||
191 | /* Traverse a link hash table. */ |
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192 | extern void bfd_link_hash_traverse |
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193 | (struct bfd_link_hash_table *, |
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194 | bfd_boolean (*) (struct bfd_link_hash_entry *, void *), |
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195 | void *); |
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196 | |||
197 | /* Add an entry to the undefs list. */ |
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198 | extern void bfd_link_add_undef |
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199 | (struct bfd_link_hash_table *, struct bfd_link_hash_entry *); |
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200 | |||
201 | /* Remove symbols from the undefs list that don't belong there. */ |
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202 | extern void bfd_link_repair_undef_list |
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203 | (struct bfd_link_hash_table *table); |
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204 | |||
205 | /* Read symbols and cache symbol pointer array in outsymbols. */ |
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206 | extern bfd_boolean bfd_generic_link_read_symbols (bfd *); |
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207 | |||
208 | struct bfd_sym_chain |
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209 | { |
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210 | struct bfd_sym_chain *next; |
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211 | const char *name; |
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212 | }; |
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213 | |||
214 | /* How to handle unresolved symbols. |
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215 | There are four possibilities which are enumerated below: */ |
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216 | enum report_method |
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217 | { |
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218 | /* This is the initial value when then link_info structure is created. |
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219 | It allows the various stages of the linker to determine whether they |
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220 | allowed to set the value. */ |
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221 | RM_NOT_YET_SET = 0, |
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222 | RM_IGNORE, |
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223 | RM_GENERATE_WARNING, |
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224 | RM_GENERATE_ERROR |
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225 | }; |
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226 | |||
227 | typedef enum {with_flags, without_flags} flag_type; |
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228 | |||
229 | /* A section flag list. */ |
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230 | struct flag_info_list |
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231 | { |
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232 | flag_type with; |
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233 | const char *name; |
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234 | bfd_boolean valid; |
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235 | struct flag_info_list *next; |
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236 | }; |
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237 | |||
238 | /* Section flag info. */ |
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239 | struct flag_info |
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240 | { |
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241 | flagword only_with_flags; |
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242 | flagword not_with_flags; |
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243 | struct flag_info_list *flag_list; |
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244 | bfd_boolean flags_initialized; |
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245 | }; |
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246 | |||
247 | struct bfd_elf_dynamic_list; |
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248 | struct bfd_elf_version_tree; |
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249 | |||
250 | /* This structure holds all the information needed to communicate |
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251 | between BFD and the linker when doing a link. */ |
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252 | |||
253 | struct bfd_link_info |
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254 | { |
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255 | /* TRUE if BFD should generate a shared object (or a pie). */ |
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256 | unsigned int shared: 1; |
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257 | |||
258 | /* TRUE if generating an executable, position independent or not. */ |
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259 | unsigned int executable : 1; |
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260 | |||
261 | /* TRUE if generating a position independent executable. */ |
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262 | unsigned int pie: 1; |
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263 | |||
264 | /* TRUE if BFD should generate a relocatable object file. */ |
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265 | unsigned int relocatable: 1; |
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266 | |||
267 | /* TRUE if BFD should pre-bind symbols in a shared object. */ |
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268 | unsigned int symbolic: 1; |
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269 | |||
270 | /* TRUE if executable should not contain copy relocs. |
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271 | Setting this true may result in a non-sharable text segment. */ |
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272 | unsigned int nocopyreloc: 1; |
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273 | |||
274 | /* TRUE if BFD should export all symbols in the dynamic symbol table |
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275 | of an executable, rather than only those used. */ |
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276 | unsigned int export_dynamic: 1; |
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277 | |||
278 | /* TRUE if a default symbol version should be created and used for |
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279 | exported symbols. */ |
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280 | unsigned int create_default_symver: 1; |
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281 | |||
282 | /* TRUE if unreferenced sections should be removed. */ |
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283 | unsigned int gc_sections: 1; |
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284 | |||
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 | |||
289 | /* TRUE if we are loading LTO outputs. */ |
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290 | unsigned int loading_lto_outputs: 1; |
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291 | |||
292 | /* TRUE if global symbols in discarded sections should be stripped. */ |
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293 | unsigned int strip_discarded: 1; |
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294 | |||
295 | /* TRUE if all data symbols should be dynamic. */ |
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296 | unsigned int dynamic_data: 1; |
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297 | |||
298 | /* Which symbols to strip. */ |
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299 | ENUM_BITFIELD (bfd_link_strip) strip : 2; |
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300 | |||
301 | /* Which local symbols to discard. */ |
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302 | ENUM_BITFIELD (bfd_link_discard) discard : 2; |
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303 | |||
304 | /* Criteria for skipping symbols when determining |
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305 | whether to include an object from an archive. */ |
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306 | ENUM_BITFIELD (bfd_link_common_skip_ar_symbols) common_skip_ar_symbols : 2; |
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307 | |||
308 | /* What to do with unresolved symbols in an object file. |
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309 | When producing executables the default is GENERATE_ERROR. |
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310 | When producing shared libraries the default is IGNORE. The |
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311 | assumption with shared libraries is that the reference will be |
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312 | resolved at load/execution time. */ |
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313 | ENUM_BITFIELD (report_method) unresolved_syms_in_objects : 2; |
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314 | |||
315 | /* What to do with unresolved symbols in a shared library. |
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316 | The same defaults apply. */ |
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317 | ENUM_BITFIELD (report_method) unresolved_syms_in_shared_libs : 2; |
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318 | |||
319 | /* TRUE if shared objects should be linked directly, not shared. */ |
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320 | unsigned int static_link: 1; |
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321 | |||
322 | /* TRUE if symbols should be retained in memory, FALSE if they |
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323 | should be freed and reread. */ |
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324 | unsigned int keep_memory: 1; |
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325 | |||
326 | /* TRUE if BFD should generate relocation information in the final |
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327 | executable. */ |
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328 | unsigned int emitrelocations: 1; |
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329 | |||
330 | /* TRUE if PT_GNU_RELRO segment should be created. */ |
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331 | unsigned int relro: 1; |
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332 | |||
333 | /* TRUE if .eh_frame_hdr section and PT_GNU_EH_FRAME ELF segment |
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334 | should be created. */ |
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335 | unsigned int eh_frame_hdr: 1; |
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336 | |||
337 | /* TRUE if we should warn when adding a DT_TEXTREL to a shared object. */ |
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338 | unsigned int warn_shared_textrel: 1; |
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339 | |||
340 | /* TRUE if we should error when adding a DT_TEXTREL. */ |
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341 | unsigned int error_textrel: 1; |
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342 | |||
343 | /* TRUE if .hash section should be created. */ |
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344 | unsigned int emit_hash: 1; |
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345 | |||
346 | /* TRUE if .gnu.hash section should be created. */ |
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347 | unsigned int emit_gnu_hash: 1; |
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348 | |||
349 | /* If TRUE reduce memory overheads, at the expense of speed. This will |
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350 | cause map file generation to use an O(N^2) algorithm and disable |
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351 | caching ELF symbol buffer. */ |
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352 | unsigned int reduce_memory_overheads: 1; |
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353 | |||
354 | /* TRUE if the output file should be in a traditional format. This |
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355 | is equivalent to the setting of the BFD_TRADITIONAL_FORMAT flag |
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356 | on the output file, but may be checked when reading the input |
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357 | files. */ |
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358 | unsigned int traditional_format: 1; |
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359 | |||
360 | /* TRUE if non-PLT relocs should be merged into one reloc section |
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361 | and sorted so that relocs against the same symbol come together. */ |
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362 | unsigned int combreloc: 1; |
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363 | |||
364 | /* TRUE if a default symbol version should be created and used for |
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365 | imported symbols. */ |
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366 | unsigned int default_imported_symver: 1; |
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367 | |||
368 | /* TRUE if the new ELF dynamic tags are enabled. */ |
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369 | unsigned int new_dtags: 1; |
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370 | |||
371 | /* FALSE if .eh_frame unwind info should be generated for PLT and other |
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372 | linker created sections, TRUE if it should be omitted. */ |
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373 | unsigned int no_ld_generated_unwind_info: 1; |
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374 | |||
375 | /* TRUE if BFD should generate a "task linked" object file, |
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376 | similar to relocatable but also with globals converted to |
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377 | statics. */ |
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378 | unsigned int task_link: 1; |
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379 | |||
380 | /* TRUE if ok to have multiple definition. */ |
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381 | unsigned int allow_multiple_definition: 1; |
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382 | |||
383 | /* TRUE if ok to have version with no definition. */ |
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384 | unsigned int allow_undefined_version: 1; |
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385 | |||
386 | /* TRUE if some symbols have to be dynamic, controlled by |
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387 | --dynamic-list command line options. */ |
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388 | unsigned int dynamic: 1; |
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389 | |||
390 | /* TRUE if PT_GNU_STACK segment should be created with PF_R|PF_W|PF_X |
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391 | flags. */ |
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392 | unsigned int execstack: 1; |
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393 | |||
394 | /* TRUE if PT_GNU_STACK segment should be created with PF_R|PF_W |
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395 | flags. */ |
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396 | unsigned int noexecstack: 1; |
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397 | |||
398 | /* TRUE if we want to produced optimized output files. This might |
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399 | need much more time and therefore must be explicitly selected. */ |
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400 | unsigned int optimize: 1; |
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401 | |||
402 | /* TRUE if user should be informed of removed unreferenced sections. */ |
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403 | unsigned int print_gc_sections: 1; |
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404 | |||
405 | /* TRUE if we should warn alternate ELF machine code. */ |
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406 | unsigned int warn_alternate_em: 1; |
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407 | |||
408 | /* TRUE if the linker script contained an explicit PHDRS command. */ |
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409 | unsigned int user_phdrs: 1; |
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410 | |||
411 | /* Char that may appear as the first char of a symbol, but should be |
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412 | skipped (like symbol_leading_char) when looking up symbols in |
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413 | wrap_hash. Used by PowerPC Linux for 'dot' symbols. */ |
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414 | char wrap_char; |
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415 | |||
416 | /* Separator between archive and filename in linker script filespecs. */ |
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417 | char path_separator; |
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418 | |||
419 | /* Default stack size. Zero means default (often zero itself), -1 |
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420 | means explicitly zero-sized. */ |
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421 | bfd_signed_vma stacksize; |
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422 | |||
423 | /* Enable or disable target specific optimizations. |
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424 | |||
425 | Not all targets have optimizations to enable. |
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426 | |||
427 | Normally these optimizations are disabled by default but some targets |
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428 | prefer to enable them by default. So this field is a tri-state variable. |
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429 | The values are: |
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430 | |||
431 | zero: Enable the optimizations (either from --relax being specified on |
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432 | the command line or the backend's before_allocation emulation function. |
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433 | |||
434 | positive: The user has requested that these optimizations be disabled. |
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435 | (Via the --no-relax command line option). |
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436 | |||
437 | negative: The optimizations are disabled. (Set when initializing the |
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438 | args_type structure in ldmain.c:main. */ |
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439 | signed int disable_target_specific_optimizations; |
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440 | |||
441 | /* Function callbacks. */ |
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442 | const struct bfd_link_callbacks *callbacks; |
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443 | |||
444 | /* Hash table handled by BFD. */ |
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445 | struct bfd_link_hash_table *hash; |
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446 | |||
447 | /* Hash table of symbols to keep. This is NULL unless strip is |
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448 | strip_some. */ |
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449 | struct bfd_hash_table *keep_hash; |
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450 | |||
451 | /* Hash table of symbols to report back via the notice callback. If |
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452 | this is NULL, and notice_all is FALSE, then no symbols are |
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453 | reported back. */ |
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454 | struct bfd_hash_table *notice_hash; |
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455 | |||
456 | /* Hash table of symbols which are being wrapped (the --wrap linker |
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457 | option). If this is NULL, no symbols are being wrapped. */ |
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458 | struct bfd_hash_table *wrap_hash; |
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459 | |||
460 | /* Hash table of symbols which may be left unresolved during |
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461 | a link. If this is NULL, no symbols can be left unresolved. */ |
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462 | struct bfd_hash_table *ignore_hash; |
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463 | |||
464 | /* The output BFD. */ |
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465 | bfd *output_bfd; |
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466 | |||
467 | /* The list of input BFD's involved in the link. These are chained |
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468 | together via the link_next field. */ |
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469 | bfd *input_bfds; |
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470 | bfd **input_bfds_tail; |
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471 | |||
472 | /* If a symbol should be created for each input BFD, this is section |
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473 | where those symbols should be placed. It must be a section in |
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474 | the output BFD. It may be NULL, in which case no such symbols |
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475 | will be created. This is to support CREATE_OBJECT_SYMBOLS in the |
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476 | linker command language. */ |
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477 | asection *create_object_symbols_section; |
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478 | |||
479 | /* List of global symbol names that are starting points for marking |
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480 | sections against garbage collection. */ |
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481 | struct bfd_sym_chain *gc_sym_list; |
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482 | |||
483 | /* If a base output file is wanted, then this points to it */ |
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484 | void *base_file; |
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485 | |||
486 | /* The function to call when the executable or shared object is |
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487 | loaded. */ |
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488 | const char *init_function; |
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489 | |||
490 | /* The function to call when the executable or shared object is |
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491 | unloaded. */ |
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492 | const char *fini_function; |
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493 | |||
494 | /* Number of relaxation passes. Usually only one relaxation pass |
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495 | is needed. But a backend can have as many relaxation passes as |
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496 | necessary. During bfd_relax_section call, it is set to the |
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497 | current pass, starting from 0. */ |
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498 | int relax_pass; |
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499 | |||
500 | /* Number of relaxation trips. This number is incremented every |
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501 | time the relaxation pass is restarted due to a previous |
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502 | relaxation returning true in *AGAIN. */ |
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503 | int relax_trip; |
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504 | |||
505 | /* Non-zero if auto-import thunks for DATA items in pei386 DLLs |
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506 | should be generated/linked against. Set to 1 if this feature |
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507 | is explicitly requested by the user, -1 if enabled by default. */ |
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508 | int pei386_auto_import; |
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509 | |||
510 | /* Non-zero if runtime relocs for DATA items with non-zero addends |
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511 | in pei386 DLLs should be generated. Set to 1 if this feature |
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512 | is explicitly requested by the user, -1 if enabled by default. */ |
||
513 | int pei386_runtime_pseudo_reloc; |
||
514 | |||
515 | /* How many spare .dynamic DT_NULL entries should be added? */ |
||
516 | unsigned int spare_dynamic_tags; |
||
517 | |||
518 | /* May be used to set DT_FLAGS for ELF. */ |
||
519 | bfd_vma flags; |
||
520 | |||
521 | /* May be used to set DT_FLAGS_1 for ELF. */ |
||
522 | bfd_vma flags_1; |
||
523 | |||
524 | /* Start and end of RELRO region. */ |
||
525 | bfd_vma relro_start, relro_end; |
||
526 | |||
527 | /* List of symbols should be dynamic. */ |
||
528 | struct bfd_elf_dynamic_list *dynamic_list; |
||
529 | |||
530 | /* The version information. */ |
||
531 | struct bfd_elf_version_tree *version_info; |
||
532 | }; |
||
533 | |||
534 | /* This structures holds a set of callback functions. These are called |
||
535 | by the BFD linker routines. Except for the info functions, the first |
||
536 | argument to each callback function is the bfd_link_info structure |
||
537 | being used and each function returns a boolean value. If the |
||
538 | function returns FALSE, then the BFD function which called it should |
||
539 | return with a failure indication. */ |
||
540 | |||
541 | struct bfd_link_callbacks |
||
542 | { |
||
543 | /* A function which is called when an object is added from an |
||
544 | archive. ABFD is the archive element being added. NAME is the |
||
545 | name of the symbol which caused the archive element to be pulled |
||
546 | in. This function may set *SUBSBFD to point to an alternative |
||
547 | BFD from which symbols should in fact be added in place of the |
||
548 | original BFD's symbols. */ |
||
549 | bfd_boolean (*add_archive_element) |
||
550 | (struct bfd_link_info *, bfd *abfd, const char *name, bfd **subsbfd); |
||
551 | /* A function which is called when a symbol is found with multiple |
||
552 | definitions. H is the symbol which is defined multiple times. |
||
553 | NBFD is the new BFD, NSEC is the new section, and NVAL is the new |
||
554 | value. NSEC may be bfd_com_section or bfd_ind_section. */ |
||
555 | bfd_boolean (*multiple_definition) |
||
556 | (struct bfd_link_info *, struct bfd_link_hash_entry *h, |
||
557 | bfd *nbfd, asection *nsec, bfd_vma nval); |
||
558 | /* A function which is called when a common symbol is defined |
||
559 | multiple times. H is the symbol appearing multiple times. |
||
560 | NBFD is the BFD of the new symbol. NTYPE is the type of the new |
||
561 | symbol, one of bfd_link_hash_defined, bfd_link_hash_common, or |
||
562 | bfd_link_hash_indirect. If NTYPE is bfd_link_hash_common, NSIZE |
||
563 | is the size of the new symbol. */ |
||
564 | bfd_boolean (*multiple_common) |
||
565 | (struct bfd_link_info *, struct bfd_link_hash_entry *h, |
||
566 | bfd *nbfd, enum bfd_link_hash_type ntype, bfd_vma nsize); |
||
567 | /* A function which is called to add a symbol to a set. ENTRY is |
||
568 | the link hash table entry for the set itself (e.g., |
||
569 | __CTOR_LIST__). RELOC is the relocation to use for an entry in |
||
570 | the set when generating a relocatable file, and is also used to |
||
571 | get the size of the entry when generating an executable file. |
||
572 | ABFD, SEC and VALUE identify the value to add to the set. */ |
||
573 | bfd_boolean (*add_to_set) |
||
574 | (struct bfd_link_info *, struct bfd_link_hash_entry *entry, |
||
575 | bfd_reloc_code_real_type reloc, bfd *abfd, asection *sec, bfd_vma value); |
||
576 | /* A function which is called when the name of a g++ constructor or |
||
577 | destructor is found. This is only called by some object file |
||
578 | formats. CONSTRUCTOR is TRUE for a constructor, FALSE for a |
||
579 | destructor. This will use BFD_RELOC_CTOR when generating a |
||
580 | relocatable file. NAME is the name of the symbol found. ABFD, |
||
581 | SECTION and VALUE are the value of the symbol. */ |
||
582 | bfd_boolean (*constructor) |
||
583 | (struct bfd_link_info *, bfd_boolean constructor, const char *name, |
||
584 | bfd *abfd, asection *sec, bfd_vma value); |
||
585 | /* A function which is called to issue a linker warning. For |
||
586 | example, this is called when there is a reference to a warning |
||
587 | symbol. WARNING is the warning to be issued. SYMBOL is the name |
||
588 | of the symbol which triggered the warning; it may be NULL if |
||
589 | there is none. ABFD, SECTION and ADDRESS identify the location |
||
590 | which trigerred the warning; either ABFD or SECTION or both may |
||
591 | be NULL if the location is not known. */ |
||
592 | bfd_boolean (*warning) |
||
593 | (struct bfd_link_info *, const char *warning, const char *symbol, |
||
594 | bfd *abfd, asection *section, bfd_vma address); |
||
595 | /* A function which is called when a relocation is attempted against |
||
596 | an undefined symbol. NAME is the symbol which is undefined. |
||
597 | ABFD, SECTION and ADDRESS identify the location from which the |
||
598 | reference is made. IS_FATAL indicates whether an undefined symbol is |
||
599 | a fatal error or not. In some cases SECTION may be NULL. */ |
||
600 | bfd_boolean (*undefined_symbol) |
||
601 | (struct bfd_link_info *, const char *name, bfd *abfd, |
||
602 | asection *section, bfd_vma address, bfd_boolean is_fatal); |
||
603 | /* A function which is called when a reloc overflow occurs. ENTRY is |
||
604 | the link hash table entry for the symbol the reloc is against. |
||
605 | NAME is the name of the local symbol or section the reloc is |
||
606 | against, RELOC_NAME is the name of the relocation, and ADDEND is |
||
607 | any addend that is used. ABFD, SECTION and ADDRESS identify the |
||
608 | location at which the overflow occurs; if this is the result of a |
||
609 | bfd_section_reloc_link_order or bfd_symbol_reloc_link_order, then |
||
610 | ABFD will be NULL. */ |
||
611 | bfd_boolean (*reloc_overflow) |
||
612 | (struct bfd_link_info *, struct bfd_link_hash_entry *entry, |
||
613 | const char *name, const char *reloc_name, bfd_vma addend, |
||
614 | bfd *abfd, asection *section, bfd_vma address); |
||
615 | /* A function which is called when a dangerous reloc is performed. |
||
616 | MESSAGE is an appropriate message. |
||
617 | ABFD, SECTION and ADDRESS identify the location at which the |
||
618 | problem occurred; if this is the result of a |
||
619 | bfd_section_reloc_link_order or bfd_symbol_reloc_link_order, then |
||
620 | ABFD will be NULL. */ |
||
621 | bfd_boolean (*reloc_dangerous) |
||
622 | (struct bfd_link_info *, const char *message, |
||
623 | bfd *abfd, asection *section, bfd_vma address); |
||
624 | /* A function which is called when a reloc is found to be attached |
||
625 | to a symbol which is not being written out. NAME is the name of |
||
626 | the symbol. ABFD, SECTION and ADDRESS identify the location of |
||
627 | the reloc; if this is the result of a |
||
628 | bfd_section_reloc_link_order or bfd_symbol_reloc_link_order, then |
||
629 | ABFD will be NULL. */ |
||
630 | bfd_boolean (*unattached_reloc) |
||
631 | (struct bfd_link_info *, const char *name, |
||
632 | bfd *abfd, asection *section, bfd_vma address); |
||
633 | /* A function which is called when a symbol in notice_hash is |
||
634 | defined or referenced. H is the symbol. ABFD, SECTION and |
||
635 | ADDRESS are the (new) value of the symbol. If SECTION is |
||
636 | bfd_und_section, this is a reference. FLAGS are the symbol |
||
637 | BSF_* flags. STRING is the name of the symbol to indirect to if |
||
638 | the sym is indirect, or the warning string if a warning sym. */ |
||
639 | bfd_boolean (*notice) |
||
640 | (struct bfd_link_info *, struct bfd_link_hash_entry *h, |
||
641 | bfd *abfd, asection *section, bfd_vma address, flagword flags, |
||
642 | const char *string); |
||
643 | /* Error or warning link info message. */ |
||
644 | void (*einfo) |
||
645 | (const char *fmt, ...); |
||
646 | /* General link info message. */ |
||
647 | void (*info) |
||
648 | (const char *fmt, ...); |
||
649 | /* Message to be printed in linker map file. */ |
||
650 | void (*minfo) |
||
651 | (const char *fmt, ...); |
||
652 | /* This callback provides a chance for users of the BFD library to |
||
653 | override its decision about whether to place two adjacent sections |
||
654 | into the same segment. */ |
||
655 | bfd_boolean (*override_segment_assignment) |
||
656 | (struct bfd_link_info *, bfd * abfd, |
||
657 | asection * current_section, asection * previous_section, |
||
658 | bfd_boolean new_segment); |
||
659 | }; |
||
660 | |||
661 | /* The linker builds link_order structures which tell the code how to |
||
662 | include input data in the output file. */ |
||
663 | |||
664 | /* These are the types of link_order structures. */ |
||
665 | |||
666 | enum bfd_link_order_type |
||
667 | { |
||
668 | bfd_undefined_link_order, /* Undefined. */ |
||
669 | bfd_indirect_link_order, /* Built from a section. */ |
||
670 | bfd_data_link_order, /* Set to explicit data. */ |
||
671 | bfd_section_reloc_link_order, /* Relocate against a section. */ |
||
672 | bfd_symbol_reloc_link_order /* Relocate against a symbol. */ |
||
673 | }; |
||
674 | |||
675 | /* This is the link_order structure itself. These form a chain |
||
676 | attached to the output section whose contents they are describing. */ |
||
677 | |||
678 | struct bfd_link_order |
||
679 | { |
||
680 | /* Next link_order in chain. */ |
||
681 | struct bfd_link_order *next; |
||
682 | /* Type of link_order. */ |
||
683 | enum bfd_link_order_type type; |
||
684 | /* Offset within output section. */ |
||
685 | bfd_vma offset; |
||
686 | /* Size within output section. */ |
||
687 | bfd_size_type size; |
||
688 | /* Type specific information. */ |
||
689 | union |
||
690 | { |
||
691 | struct |
||
692 | { |
||
693 | /* Section to include. If this is used, then |
||
694 | section->output_section must be the section the |
||
695 | link_order is attached to, section->output_offset must |
||
696 | equal the link_order offset field, and section->size |
||
697 | must equal the link_order size field. Maybe these |
||
698 | restrictions should be relaxed someday. */ |
||
699 | asection *section; |
||
700 | } indirect; |
||
701 | struct |
||
702 | { |
||
703 | /* Size of contents, or zero when contents should be filled by |
||
704 | the architecture-dependent fill function. |
||
705 | A non-zero value allows filling of the output section |
||
706 | with an arbitrary repeated pattern. */ |
||
707 | unsigned int size; |
||
708 | /* Data to put into file. */ |
||
709 | bfd_byte *contents; |
||
710 | } data; |
||
711 | struct |
||
712 | { |
||
713 | /* Description of reloc to generate. Used for |
||
714 | bfd_section_reloc_link_order and |
||
715 | bfd_symbol_reloc_link_order. */ |
||
716 | struct bfd_link_order_reloc *p; |
||
717 | } reloc; |
||
718 | } u; |
||
719 | }; |
||
720 | |||
721 | /* A linker order of type bfd_section_reloc_link_order or |
||
722 | bfd_symbol_reloc_link_order means to create a reloc against a |
||
723 | section or symbol, respectively. This is used to implement -Ur to |
||
724 | generate relocs for the constructor tables. The |
||
725 | bfd_link_order_reloc structure describes the reloc that BFD should |
||
726 | create. It is similar to a arelent, but I didn't use arelent |
||
727 | because the linker does not know anything about most symbols, and |
||
728 | any asymbol structure it creates will be partially meaningless. |
||
729 | This information could logically be in the bfd_link_order struct, |
||
730 | but I didn't want to waste the space since these types of relocs |
||
731 | are relatively rare. */ |
||
732 | |||
733 | struct bfd_link_order_reloc |
||
734 | { |
||
735 | /* Reloc type. */ |
||
736 | bfd_reloc_code_real_type reloc; |
||
737 | |||
738 | union |
||
739 | { |
||
740 | /* For type bfd_section_reloc_link_order, this is the section |
||
741 | the reloc should be against. This must be a section in the |
||
742 | output BFD, not any of the input BFDs. */ |
||
743 | asection *section; |
||
744 | /* For type bfd_symbol_reloc_link_order, this is the name of the |
||
745 | symbol the reloc should be against. */ |
||
746 | const char *name; |
||
747 | } u; |
||
748 | |||
749 | /* Addend to use. The object file should contain zero. The BFD |
||
750 | backend is responsible for filling in the contents of the object |
||
751 | file correctly. For some object file formats (e.g., COFF) the |
||
752 | addend must be stored into in the object file, and for some |
||
753 | (e.g., SPARC a.out) it is kept in the reloc. */ |
||
754 | bfd_vma addend; |
||
755 | }; |
||
756 | |||
757 | /* Allocate a new link_order for a section. */ |
||
758 | extern struct bfd_link_order *bfd_new_link_order (bfd *, asection *); |
||
759 | |||
760 | /* These structures are used to describe version information for the |
||
761 | ELF linker. These structures could be manipulated entirely inside |
||
762 | BFD, but it would be a pain. Instead, the regular linker sets up |
||
763 | these structures, and then passes them into BFD. */ |
||
764 | |||
765 | /* Glob pattern for a version. */ |
||
766 | |||
767 | struct bfd_elf_version_expr |
||
768 | { |
||
769 | /* Next glob pattern for this version. */ |
||
770 | struct bfd_elf_version_expr *next; |
||
771 | /* Glob pattern. */ |
||
772 | const char *pattern; |
||
773 | /* Set if pattern is not a glob. */ |
||
774 | unsigned int literal : 1; |
||
775 | /* Defined by ".symver". */ |
||
776 | unsigned int symver : 1; |
||
777 | /* Defined by version script. */ |
||
778 | unsigned int script : 1; |
||
779 | /* Pattern type. */ |
||
780 | #define BFD_ELF_VERSION_C_TYPE 1 |
||
781 | #define BFD_ELF_VERSION_CXX_TYPE 2 |
||
782 | #define BFD_ELF_VERSION_JAVA_TYPE 4 |
||
783 | unsigned int mask : 3; |
||
784 | }; |
||
785 | |||
786 | struct bfd_elf_version_expr_head |
||
787 | { |
||
788 | /* List of all patterns, both wildcards and non-wildcards. */ |
||
789 | struct bfd_elf_version_expr *list; |
||
790 | /* Hash table for non-wildcards. */ |
||
791 | void *htab; |
||
792 | /* Remaining patterns. */ |
||
793 | struct bfd_elf_version_expr *remaining; |
||
794 | /* What kind of pattern types are present in list (bitmask). */ |
||
795 | unsigned int mask; |
||
796 | }; |
||
797 | |||
798 | /* Version dependencies. */ |
||
799 | |||
800 | struct bfd_elf_version_deps |
||
801 | { |
||
802 | /* Next dependency for this version. */ |
||
803 | struct bfd_elf_version_deps *next; |
||
804 | /* The version which this version depends upon. */ |
||
805 | struct bfd_elf_version_tree *version_needed; |
||
806 | }; |
||
807 | |||
808 | /* A node in the version tree. */ |
||
809 | |||
810 | struct bfd_elf_version_tree |
||
811 | { |
||
812 | /* Next version. */ |
||
813 | struct bfd_elf_version_tree *next; |
||
814 | /* Name of this version. */ |
||
815 | const char *name; |
||
816 | /* Version number. */ |
||
817 | unsigned int vernum; |
||
818 | /* Regular expressions for global symbols in this version. */ |
||
819 | struct bfd_elf_version_expr_head globals; |
||
820 | /* Regular expressions for local symbols in this version. */ |
||
821 | struct bfd_elf_version_expr_head locals; |
||
822 | /* List of versions which this version depends upon. */ |
||
823 | struct bfd_elf_version_deps *deps; |
||
824 | /* Index of the version name. This is used within BFD. */ |
||
825 | unsigned int name_indx; |
||
826 | /* Whether this version tree was used. This is used within BFD. */ |
||
827 | int used; |
||
828 | /* Matching hook. */ |
||
829 | struct bfd_elf_version_expr *(*match) |
||
830 | (struct bfd_elf_version_expr_head *head, |
||
831 | struct bfd_elf_version_expr *prev, const char *sym); |
||
832 | }; |
||
833 | |||
834 | struct bfd_elf_dynamic_list |
||
835 | { |
||
836 | struct bfd_elf_version_expr_head head; |
||
837 | struct bfd_elf_version_expr *(*match) |
||
838 | (struct bfd_elf_version_expr_head *head, |
||
839 | struct bfd_elf_version_expr *prev, const char *sym); |
||
840 | }; |
||
841 | |||
842 | #endif |