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5197 | serge | 1 | /* linker.c -- BFD linker 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, 2012 |
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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 | #include "sysdep.h" |
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25 | #include "bfd.h" |
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26 | #include "libbfd.h" |
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27 | #include "bfdlink.h" |
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28 | #include "genlink.h" |
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29 | |||
30 | /* |
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31 | SECTION |
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32 | Linker Functions |
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33 | |||
34 | @cindex Linker |
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35 | The linker uses three special entry points in the BFD target |
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36 | vector. It is not necessary to write special routines for |
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37 | these entry points when creating a new BFD back end, since |
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38 | generic versions are provided. However, writing them can |
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39 | speed up linking and make it use significantly less runtime |
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40 | memory. |
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41 | |||
42 | The first routine creates a hash table used by the other |
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43 | routines. The second routine adds the symbols from an object |
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44 | file to the hash table. The third routine takes all the |
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45 | object files and links them together to create the output |
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46 | file. These routines are designed so that the linker proper |
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47 | does not need to know anything about the symbols in the object |
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48 | files that it is linking. The linker merely arranges the |
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49 | sections as directed by the linker script and lets BFD handle |
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50 | the details of symbols and relocs. |
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51 | |||
52 | The second routine and third routines are passed a pointer to |
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53 | a < |
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54 | < |
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55 | including the linker hash table (which was created by the |
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56 | first routine) and a set of callback functions to the linker |
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57 | proper. |
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58 | |||
59 | The generic linker routines are in < |
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60 | header file < |
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61 | ends which have implemented versions of these routines are |
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62 | a.out (in < |
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63 | routines are used as examples throughout this section. |
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64 | |||
65 | @menu |
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66 | @* Creating a Linker Hash Table:: |
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67 | @* Adding Symbols to the Hash Table:: |
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68 | @* Performing the Final Link:: |
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69 | @end menu |
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70 | |||
71 | INODE |
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72 | Creating a Linker Hash Table, Adding Symbols to the Hash Table, Linker Functions, Linker Functions |
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73 | SUBSECTION |
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74 | Creating a linker hash table |
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75 | |||
76 | @cindex _bfd_link_hash_table_create in target vector |
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77 | @cindex target vector (_bfd_link_hash_table_create) |
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78 | The linker routines must create a hash table, which must be |
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79 | derived from < |
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80 | < |
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81 | create a derived hash table. This entry point is called using |
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82 | the target vector of the linker output file. |
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83 | |||
84 | The <<_bfd_link_hash_table_create>> entry point must allocate |
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85 | and initialize an instance of the desired hash table. If the |
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86 | back end does not require any additional information to be |
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87 | stored with the entries in the hash table, the entry point may |
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88 | simply create a < |
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89 | however, some additional information will be needed. |
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90 | |||
91 | For example, with each entry in the hash table the a.out |
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92 | linker keeps the index the symbol has in the final output file |
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93 | (this index number is used so that when doing a relocatable |
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94 | link the symbol index used in the output file can be quickly |
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95 | filled in when copying over a reloc). The a.out linker code |
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96 | defines the required structures and functions for a hash table |
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97 | derived from < |
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98 | hash table is created by the function |
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99 | < |
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100 | space for the hash table, initializes it, and returns a |
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101 | pointer to it. |
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102 | |||
103 | When writing the linker routines for a new back end, you will |
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104 | generally not know exactly which fields will be required until |
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105 | you have finished. You should simply create a new hash table |
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106 | which defines no additional fields, and then simply add fields |
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107 | as they become necessary. |
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108 | |||
109 | INODE |
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110 | Adding Symbols to the Hash Table, Performing the Final Link, Creating a Linker Hash Table, Linker Functions |
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111 | SUBSECTION |
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112 | Adding symbols to the hash table |
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113 | |||
114 | @cindex _bfd_link_add_symbols in target vector |
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115 | @cindex target vector (_bfd_link_add_symbols) |
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116 | The linker proper will call the <<_bfd_link_add_symbols>> |
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117 | entry point for each object file or archive which is to be |
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118 | linked (typically these are the files named on the command |
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119 | line, but some may also come from the linker script). The |
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120 | entry point is responsible for examining the file. For an |
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121 | object file, BFD must add any relevant symbol information to |
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122 | the hash table. For an archive, BFD must determine which |
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123 | elements of the archive should be used and adding them to the |
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124 | link. |
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125 | |||
126 | The a.out version of this entry point is |
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127 | < |
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128 | |||
129 | @menu |
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130 | @* Differing file formats:: |
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131 | @* Adding symbols from an object file:: |
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132 | @* Adding symbols from an archive:: |
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133 | @end menu |
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134 | |||
135 | INODE |
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136 | Differing file formats, Adding symbols from an object file, Adding Symbols to the Hash Table, Adding Symbols to the Hash Table |
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137 | SUBSUBSECTION |
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138 | Differing file formats |
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139 | |||
140 | Normally all the files involved in a link will be of the same |
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141 | format, but it is also possible to link together different |
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142 | format object files, and the back end must support that. The |
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143 | <<_bfd_link_add_symbols>> entry point is called via the target |
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144 | vector of the file to be added. This has an important |
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145 | consequence: the function may not assume that the hash table |
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146 | is the type created by the corresponding |
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147 | <<_bfd_link_hash_table_create>> vector. All the |
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148 | <<_bfd_link_add_symbols>> function can assume about the hash |
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149 | table is that it is derived from < |
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150 | bfd_link_hash_table>>. |
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151 | |||
152 | Sometimes the <<_bfd_link_add_symbols>> function must store |
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153 | some information in the hash table entry to be used by the |
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154 | <<_bfd_final_link>> function. In such a case the output bfd |
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155 | xvec must be checked to make sure that the hash table was |
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156 | created by an object file of the same format. |
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157 | |||
158 | The <<_bfd_final_link>> routine must be prepared to handle a |
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159 | hash entry without any extra information added by the |
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160 | <<_bfd_link_add_symbols>> function. A hash entry without |
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161 | extra information will also occur when the linker script |
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162 | directs the linker to create a symbol. Note that, regardless |
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163 | of how a hash table entry is added, all the fields will be |
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164 | initialized to some sort of null value by the hash table entry |
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165 | initialization function. |
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166 | |||
167 | See < |
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168 | check the output bfd before saving information (in this |
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169 | case, the ECOFF external symbol debugging information) in a |
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170 | hash table entry. |
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171 | |||
172 | INODE |
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173 | Adding symbols from an object file, Adding symbols from an archive, Differing file formats, Adding Symbols to the Hash Table |
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174 | SUBSUBSECTION |
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175 | Adding symbols from an object file |
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176 | |||
177 | When the <<_bfd_link_add_symbols>> routine is passed an object |
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178 | file, it must add all externally visible symbols in that |
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179 | object file to the hash table. The actual work of adding the |
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180 | symbol to the hash table is normally handled by the function |
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181 | <<_bfd_generic_link_add_one_symbol>>. The |
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182 | <<_bfd_link_add_symbols>> routine is responsible for reading |
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183 | all the symbols from the object file and passing the correct |
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184 | information to <<_bfd_generic_link_add_one_symbol>>. |
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185 | |||
186 | The <<_bfd_link_add_symbols>> routine should not use |
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187 | < |
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188 | providing this routine is to avoid the overhead of converting |
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189 | the symbols into generic < |
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190 | |||
191 | @findex _bfd_generic_link_add_one_symbol |
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192 | <<_bfd_generic_link_add_one_symbol>> handles the details of |
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193 | combining common symbols, warning about multiple definitions, |
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194 | and so forth. It takes arguments which describe the symbol to |
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195 | add, notably symbol flags, a section, and an offset. The |
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196 | symbol flags include such things as < |
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197 | < |
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198 | file, or something like < |
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199 | symbol or < |
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200 | |||
201 | If the <<_bfd_final_link>> routine is also going to need to |
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202 | read the symbol information, the <<_bfd_link_add_symbols>> |
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203 | routine should save it somewhere attached to the object file |
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204 | BFD. However, the information should only be saved if the |
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205 | < |
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206 | that the <<-no-keep-memory>> linker switch is effective. |
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207 | |||
208 | The a.out function which adds symbols from an object file is |
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209 | < |
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210 | work is in < |
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211 | pointers to the hash tables entries created by |
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212 | <<_bfd_generic_link_add_one_symbol>> indexed by symbol number, |
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213 | so that the <<_bfd_final_link>> routine does not have to call |
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214 | the hash table lookup routine to locate the entry. |
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215 | |||
216 | INODE |
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217 | Adding symbols from an archive, , Adding symbols from an object file, Adding Symbols to the Hash Table |
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218 | SUBSUBSECTION |
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219 | Adding symbols from an archive |
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220 | |||
221 | When the <<_bfd_link_add_symbols>> routine is passed an |
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222 | archive, it must look through the symbols defined by the |
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223 | archive and decide which elements of the archive should be |
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224 | included in the link. For each such element it must call the |
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225 | < |
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226 | symbols from the object file to the linker hash table. (The |
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227 | callback may in fact indicate that a replacement BFD should be |
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228 | used, in which case the symbols from that BFD should be added |
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229 | to the linker hash table instead.) |
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230 | |||
231 | @findex _bfd_generic_link_add_archive_symbols |
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232 | In most cases the work of looking through the symbols in the |
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233 | archive should be done by the |
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234 | <<_bfd_generic_link_add_archive_symbols>> function. This |
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235 | function builds a hash table from the archive symbol table and |
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236 | looks through the list of undefined symbols to see which |
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237 | elements should be included. |
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238 | <<_bfd_generic_link_add_archive_symbols>> is passed a function |
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239 | to call to make the final decision about adding an archive |
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240 | element to the link and to do the actual work of adding the |
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241 | symbols to the linker hash table. |
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242 | |||
243 | The function passed to |
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244 | <<_bfd_generic_link_add_archive_symbols>> must read the |
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245 | symbols of the archive element and decide whether the archive |
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246 | element should be included in the link. If the element is to |
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247 | be included, the < |
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248 | routine must be called with the element as an argument, and |
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249 | the element's symbols must be added to the linker hash table |
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250 | just as though the element had itself been passed to the |
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251 | <<_bfd_link_add_symbols>> function. The < |
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252 | callback has the option to indicate that it would like to |
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253 | replace the element archive with a substitute BFD, in which |
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254 | case it is the symbols of that substitute BFD that must be |
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255 | added to the linker hash table instead. |
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256 | |||
257 | When the a.out <<_bfd_link_add_symbols>> function receives an |
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258 | archive, it calls <<_bfd_generic_link_add_archive_symbols>> |
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259 | passing < |
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260 | argument. < |
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261 | < |
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262 | the element (an element is only added if it provides a real, |
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263 | non-common, definition for a previously undefined or common |
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264 | symbol) it calls the < |
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265 | < |
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266 | < |
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267 | linker hash table - possibly those of a substitute BFD, if the |
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268 | < |
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269 | |||
270 | The ECOFF back end is unusual in that it does not normally |
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271 | call <<_bfd_generic_link_add_archive_symbols>>, because ECOFF |
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272 | archives already contain a hash table of symbols. The ECOFF |
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273 | back end searches the archive itself to avoid the overhead of |
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274 | creating a new hash table. |
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275 | |||
276 | INODE |
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277 | Performing the Final Link, , Adding Symbols to the Hash Table, Linker Functions |
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278 | SUBSECTION |
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279 | Performing the final link |
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280 | |||
281 | @cindex _bfd_link_final_link in target vector |
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282 | @cindex target vector (_bfd_final_link) |
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283 | When all the input files have been processed, the linker calls |
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284 | the <<_bfd_final_link>> entry point of the output BFD. This |
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285 | routine is responsible for producing the final output file, |
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286 | which has several aspects. It must relocate the contents of |
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287 | the input sections and copy the data into the output sections. |
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288 | It must build an output symbol table including any local |
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289 | symbols from the input files and the global symbols from the |
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290 | hash table. When producing relocatable output, it must |
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291 | modify the input relocs and write them into the output file. |
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292 | There may also be object format dependent work to be done. |
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293 | |||
294 | The linker will also call the < |
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295 | point when the BFD is closed. The two entry points must work |
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296 | together in order to produce the correct output file. |
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297 | |||
298 | The details of how this works are inevitably dependent upon |
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299 | the specific object file format. The a.out |
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300 | <<_bfd_final_link>> routine is < |
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301 | |||
302 | @menu |
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303 | @* Information provided by the linker:: |
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304 | @* Relocating the section contents:: |
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305 | @* Writing the symbol table:: |
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306 | @end menu |
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307 | |||
308 | INODE |
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309 | Information provided by the linker, Relocating the section contents, Performing the Final Link, Performing the Final Link |
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310 | SUBSUBSECTION |
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311 | Information provided by the linker |
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312 | |||
313 | Before the linker calls the <<_bfd_final_link>> entry point, |
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314 | it sets up some data structures for the function to use. |
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315 | |||
316 | The < |
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317 | will point to a list of all the input files included in the |
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318 | link. These files are linked through the < |
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319 | of the < |
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320 | |||
321 | Each section in the output file will have a list of |
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322 | < |
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323 | field (the < |
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324 | < |
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325 | contents of the output section in terms of the contents of |
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326 | various input sections, fill constants, and, eventually, other |
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327 | types of information. They also describe relocs that must be |
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328 | created by the BFD backend, but do not correspond to any input |
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329 | file; this is used to support -Ur, which builds constructors |
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330 | while generating a relocatable object file. |
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331 | |||
332 | INODE |
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333 | Relocating the section contents, Writing the symbol table, Information provided by the linker, Performing the Final Link |
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334 | SUBSUBSECTION |
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335 | Relocating the section contents |
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336 | |||
337 | The <<_bfd_final_link>> function should look through the |
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338 | < |
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339 | output file. Each < |
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340 | handled specially, or it should be passed to the function |
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341 | <<_bfd_default_link_order>> which will do the right thing |
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342 | (<<_bfd_default_link_order>> is defined in < |
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343 | |||
344 | For efficiency, a < |
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345 | < |
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346 | to a BFD of the same format as the output BFD must be handled |
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347 | specially. This type of < |
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348 | output section in terms of a section belonging to one of the |
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349 | input files. The <<_bfd_final_link>> function should read the |
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350 | contents of the section and any associated relocs, apply the |
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351 | relocs to the section contents, and write out the modified |
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352 | section contents. If performing a relocatable link, the |
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353 | relocs themselves must also be modified and written out. |
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354 | |||
355 | @findex _bfd_relocate_contents |
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356 | @findex _bfd_final_link_relocate |
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357 | The functions <<_bfd_relocate_contents>> and |
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358 | <<_bfd_final_link_relocate>> provide some general support for |
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359 | performing the actual relocations, notably overflow checking. |
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360 | Their arguments include information about the symbol the |
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361 | relocation is against and a < |
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362 | which describes the relocation to perform. These functions |
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363 | are defined in < |
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364 | |||
365 | The a.out function which handles reading, relocating, and |
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366 | writing section contents is < |
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367 | actual relocation is done in < |
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368 | and < |
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369 | |||
370 | INODE |
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371 | Writing the symbol table, , Relocating the section contents, Performing the Final Link |
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372 | SUBSUBSECTION |
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373 | Writing the symbol table |
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374 | |||
375 | The <<_bfd_final_link>> function must gather all the symbols |
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376 | in the input files and write them out. It must also write out |
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377 | all the symbols in the global hash table. This must be |
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378 | controlled by the < |
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379 | < |
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380 | |||
381 | The local symbols of the input files will not have been |
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382 | entered into the linker hash table. The <<_bfd_final_link>> |
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383 | routine must consider each input file and include the symbols |
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384 | in the output file. It may be convenient to do this when |
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385 | looking through the < |
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386 | done by stepping through the < |
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387 | |||
388 | The <<_bfd_final_link>> routine must also traverse the global |
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389 | hash table to gather all the externally visible symbols. It |
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390 | is possible that most of the externally visible symbols may be |
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391 | written out when considering the symbols of each input file, |
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392 | but it is still necessary to traverse the hash table since the |
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393 | linker script may have defined some symbols that are not in |
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394 | any of the input files. |
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395 | |||
396 | The < |
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397 | controls which symbols are written out. The possible values |
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398 | are listed in < |
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399 | then the < |
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400 | structure is a hash table of symbols to keep; each symbol |
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401 | should be looked up in this hash table, and only symbols which |
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402 | are present should be included in the output file. |
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403 | |||
404 | If the < |
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405 | permits local symbols to be written out, the < |
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406 | is used to further controls which local symbols are included |
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407 | in the output file. If the value is < |
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408 | local symbols which begin with a certain prefix are discarded; |
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409 | this is controlled by the < |
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410 | |||
411 | The a.out backend handles symbols by calling |
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412 | < |
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413 | traversing the global hash table with the function |
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414 | < |
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415 | while writing out the symbols, which is written to the output |
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416 | file at the end of < |
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417 | */ |
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418 | |||
419 | static bfd_boolean generic_link_add_object_symbols |
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420 | (bfd *, struct bfd_link_info *, bfd_boolean collect); |
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421 | static bfd_boolean generic_link_add_symbols |
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422 | (bfd *, struct bfd_link_info *, bfd_boolean); |
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423 | static bfd_boolean generic_link_check_archive_element_no_collect |
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424 | (bfd *, struct bfd_link_info *, bfd_boolean *); |
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425 | static bfd_boolean generic_link_check_archive_element_collect |
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426 | (bfd *, struct bfd_link_info *, bfd_boolean *); |
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427 | static bfd_boolean generic_link_check_archive_element |
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428 | (bfd *, struct bfd_link_info *, bfd_boolean *, bfd_boolean); |
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429 | static bfd_boolean generic_link_add_symbol_list |
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430 | (bfd *, struct bfd_link_info *, bfd_size_type count, asymbol **, |
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431 | bfd_boolean); |
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432 | static bfd_boolean generic_add_output_symbol |
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433 | (bfd *, size_t *psymalloc, asymbol *); |
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434 | static bfd_boolean default_data_link_order |
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435 | (bfd *, struct bfd_link_info *, asection *, struct bfd_link_order *); |
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436 | static bfd_boolean default_indirect_link_order |
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437 | (bfd *, struct bfd_link_info *, asection *, struct bfd_link_order *, |
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438 | bfd_boolean); |
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439 | |||
440 | /* The link hash table structure is defined in bfdlink.h. It provides |
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441 | a base hash table which the backend specific hash tables are built |
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442 | upon. */ |
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443 | |||
444 | /* Routine to create an entry in the link hash table. */ |
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445 | |||
446 | struct bfd_hash_entry * |
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447 | _bfd_link_hash_newfunc (struct bfd_hash_entry *entry, |
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448 | struct bfd_hash_table *table, |
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449 | const char *string) |
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450 | { |
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451 | /* Allocate the structure if it has not already been allocated by a |
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452 | subclass. */ |
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453 | if (entry == NULL) |
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454 | { |
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455 | entry = (struct bfd_hash_entry *) |
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456 | bfd_hash_allocate (table, sizeof (struct bfd_link_hash_entry)); |
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457 | if (entry == NULL) |
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458 | return entry; |
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459 | } |
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460 | |||
461 | /* Call the allocation method of the superclass. */ |
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462 | entry = bfd_hash_newfunc (entry, table, string); |
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463 | if (entry) |
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464 | { |
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465 | struct bfd_link_hash_entry *h = (struct bfd_link_hash_entry *) entry; |
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466 | |||
467 | /* Initialize the local fields. */ |
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468 | memset ((char *) &h->root + sizeof (h->root), 0, |
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469 | sizeof (*h) - sizeof (h->root)); |
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470 | } |
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471 | |||
472 | return entry; |
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473 | } |
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474 | |||
475 | /* Initialize a link hash table. The BFD argument is the one |
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476 | responsible for creating this table. */ |
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477 | |||
478 | bfd_boolean |
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479 | _bfd_link_hash_table_init |
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480 | (struct bfd_link_hash_table *table, |
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481 | bfd *abfd ATTRIBUTE_UNUSED, |
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482 | struct bfd_hash_entry *(*newfunc) (struct bfd_hash_entry *, |
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483 | struct bfd_hash_table *, |
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484 | const char *), |
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485 | unsigned int entsize) |
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486 | { |
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487 | table->undefs = NULL; |
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488 | table->undefs_tail = NULL; |
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489 | table->type = bfd_link_generic_hash_table; |
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490 | |||
491 | return bfd_hash_table_init (&table->table, newfunc, entsize); |
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492 | } |
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493 | |||
494 | /* Look up a symbol in a link hash table. If follow is TRUE, we |
||
495 | follow bfd_link_hash_indirect and bfd_link_hash_warning links to |
||
496 | the real symbol. */ |
||
497 | |||
498 | struct bfd_link_hash_entry * |
||
499 | bfd_link_hash_lookup (struct bfd_link_hash_table *table, |
||
500 | const char *string, |
||
501 | bfd_boolean create, |
||
502 | bfd_boolean copy, |
||
503 | bfd_boolean follow) |
||
504 | { |
||
505 | struct bfd_link_hash_entry *ret; |
||
506 | |||
507 | ret = ((struct bfd_link_hash_entry *) |
||
508 | bfd_hash_lookup (&table->table, string, create, copy)); |
||
509 | |||
510 | if (follow && ret != NULL) |
||
511 | { |
||
512 | while (ret->type == bfd_link_hash_indirect |
||
513 | || ret->type == bfd_link_hash_warning) |
||
514 | ret = ret->u.i.link; |
||
515 | } |
||
516 | |||
517 | return ret; |
||
518 | } |
||
519 | |||
520 | /* Look up a symbol in the main linker hash table if the symbol might |
||
521 | be wrapped. This should only be used for references to an |
||
522 | undefined symbol, not for definitions of a symbol. */ |
||
523 | |||
524 | struct bfd_link_hash_entry * |
||
525 | bfd_wrapped_link_hash_lookup (bfd *abfd, |
||
526 | struct bfd_link_info *info, |
||
527 | const char *string, |
||
528 | bfd_boolean create, |
||
529 | bfd_boolean copy, |
||
530 | bfd_boolean follow) |
||
531 | { |
||
532 | bfd_size_type amt; |
||
533 | |||
534 | if (info->wrap_hash != NULL) |
||
535 | { |
||
536 | const char *l; |
||
537 | char prefix = '\0'; |
||
538 | |||
539 | l = string; |
||
540 | if (*l == bfd_get_symbol_leading_char (abfd) || *l == info->wrap_char) |
||
541 | { |
||
542 | prefix = *l; |
||
543 | ++l; |
||
544 | } |
||
545 | |||
546 | #undef WRAP |
||
547 | #define WRAP "__wrap_" |
||
548 | |||
549 | if (bfd_hash_lookup (info->wrap_hash, l, FALSE, FALSE) != NULL) |
||
550 | { |
||
551 | char *n; |
||
552 | struct bfd_link_hash_entry *h; |
||
553 | |||
554 | /* This symbol is being wrapped. We want to replace all |
||
555 | references to SYM with references to __wrap_SYM. */ |
||
556 | |||
557 | amt = strlen (l) + sizeof WRAP + 1; |
||
558 | n = (char *) bfd_malloc (amt); |
||
559 | if (n == NULL) |
||
560 | return NULL; |
||
561 | |||
562 | n[0] = prefix; |
||
563 | n[1] = '\0'; |
||
564 | strcat (n, WRAP); |
||
565 | strcat (n, l); |
||
566 | h = bfd_link_hash_lookup (info->hash, n, create, TRUE, follow); |
||
567 | free (n); |
||
568 | return h; |
||
569 | } |
||
570 | |||
571 | #undef WRAP |
||
572 | |||
573 | #undef REAL |
||
574 | #define REAL "__real_" |
||
575 | |||
576 | if (*l == '_' |
||
577 | && CONST_STRNEQ (l, REAL) |
||
578 | && bfd_hash_lookup (info->wrap_hash, l + sizeof REAL - 1, |
||
579 | FALSE, FALSE) != NULL) |
||
580 | { |
||
581 | char *n; |
||
582 | struct bfd_link_hash_entry *h; |
||
583 | |||
584 | /* This is a reference to __real_SYM, where SYM is being |
||
585 | wrapped. We want to replace all references to __real_SYM |
||
586 | with references to SYM. */ |
||
587 | |||
588 | amt = strlen (l + sizeof REAL - 1) + 2; |
||
589 | n = (char *) bfd_malloc (amt); |
||
590 | if (n == NULL) |
||
591 | return NULL; |
||
592 | |||
593 | n[0] = prefix; |
||
594 | n[1] = '\0'; |
||
595 | strcat (n, l + sizeof REAL - 1); |
||
596 | h = bfd_link_hash_lookup (info->hash, n, create, TRUE, follow); |
||
597 | free (n); |
||
598 | return h; |
||
599 | } |
||
600 | |||
601 | #undef REAL |
||
602 | } |
||
603 | |||
604 | return bfd_link_hash_lookup (info->hash, string, create, copy, follow); |
||
605 | } |
||
606 | |||
607 | /* Traverse a generic link hash table. Differs from bfd_hash_traverse |
||
608 | in the treatment of warning symbols. When warning symbols are |
||
609 | created they replace the real symbol, so you don't get to see the |
||
610 | real symbol in a bfd_hash_travere. This traversal calls func with |
||
611 | the real symbol. */ |
||
612 | |||
613 | void |
||
614 | bfd_link_hash_traverse |
||
615 | (struct bfd_link_hash_table *htab, |
||
616 | bfd_boolean (*func) (struct bfd_link_hash_entry *, void *), |
||
617 | void *info) |
||
618 | { |
||
619 | unsigned int i; |
||
620 | |||
621 | htab->table.frozen = 1; |
||
622 | for (i = 0; i < htab->table.size; i++) |
||
623 | { |
||
624 | struct bfd_link_hash_entry *p; |
||
625 | |||
626 | p = (struct bfd_link_hash_entry *) htab->table.table[i]; |
||
627 | for (; p != NULL; p = (struct bfd_link_hash_entry *) p->root.next) |
||
628 | if (!(*func) (p->type == bfd_link_hash_warning ? p->u.i.link : p, info)) |
||
629 | goto out; |
||
630 | } |
||
631 | out: |
||
632 | htab->table.frozen = 0; |
||
633 | } |
||
634 | |||
635 | /* Add a symbol to the linker hash table undefs list. */ |
||
636 | |||
637 | void |
||
638 | bfd_link_add_undef (struct bfd_link_hash_table *table, |
||
639 | struct bfd_link_hash_entry *h) |
||
640 | { |
||
641 | BFD_ASSERT (h->u.undef.next == NULL); |
||
642 | if (table->undefs_tail != NULL) |
||
643 | table->undefs_tail->u.undef.next = h; |
||
644 | if (table->undefs == NULL) |
||
645 | table->undefs = h; |
||
646 | table->undefs_tail = h; |
||
647 | } |
||
648 | |||
649 | /* The undefs list was designed so that in normal use we don't need to |
||
650 | remove entries. However, if symbols on the list are changed from |
||
651 | bfd_link_hash_undefined to either bfd_link_hash_undefweak or |
||
652 | bfd_link_hash_new for some reason, then they must be removed from the |
||
653 | list. Failure to do so might result in the linker attempting to add |
||
654 | the symbol to the list again at a later stage. */ |
||
655 | |||
656 | void |
||
657 | bfd_link_repair_undef_list (struct bfd_link_hash_table *table) |
||
658 | { |
||
659 | struct bfd_link_hash_entry **pun; |
||
660 | |||
661 | pun = &table->undefs; |
||
662 | while (*pun != NULL) |
||
663 | { |
||
664 | struct bfd_link_hash_entry *h = *pun; |
||
665 | |||
666 | if (h->type == bfd_link_hash_new |
||
667 | || h->type == bfd_link_hash_undefweak) |
||
668 | { |
||
669 | *pun = h->u.undef.next; |
||
670 | h->u.undef.next = NULL; |
||
671 | if (h == table->undefs_tail) |
||
672 | { |
||
673 | if (pun == &table->undefs) |
||
674 | table->undefs_tail = NULL; |
||
675 | else |
||
676 | /* pun points at an u.undef.next field. Go back to |
||
677 | the start of the link_hash_entry. */ |
||
678 | table->undefs_tail = (struct bfd_link_hash_entry *) |
||
679 | ((char *) pun - ((char *) &h->u.undef.next - (char *) h)); |
||
680 | break; |
||
681 | } |
||
682 | } |
||
683 | else |
||
684 | pun = &h->u.undef.next; |
||
685 | } |
||
686 | } |
||
687 | |||
688 | /* Routine to create an entry in a generic link hash table. */ |
||
689 | |||
690 | struct bfd_hash_entry * |
||
691 | _bfd_generic_link_hash_newfunc (struct bfd_hash_entry *entry, |
||
692 | struct bfd_hash_table *table, |
||
693 | const char *string) |
||
694 | { |
||
695 | /* Allocate the structure if it has not already been allocated by a |
||
696 | subclass. */ |
||
697 | if (entry == NULL) |
||
698 | { |
||
699 | entry = (struct bfd_hash_entry *) |
||
700 | bfd_hash_allocate (table, sizeof (struct generic_link_hash_entry)); |
||
701 | if (entry == NULL) |
||
702 | return entry; |
||
703 | } |
||
704 | |||
705 | /* Call the allocation method of the superclass. */ |
||
706 | entry = _bfd_link_hash_newfunc (entry, table, string); |
||
707 | if (entry) |
||
708 | { |
||
709 | struct generic_link_hash_entry *ret; |
||
710 | |||
711 | /* Set local fields. */ |
||
712 | ret = (struct generic_link_hash_entry *) entry; |
||
713 | ret->written = FALSE; |
||
714 | ret->sym = NULL; |
||
715 | } |
||
716 | |||
717 | return entry; |
||
718 | } |
||
719 | |||
720 | /* Create a generic link hash table. */ |
||
721 | |||
722 | struct bfd_link_hash_table * |
||
723 | _bfd_generic_link_hash_table_create (bfd *abfd) |
||
724 | { |
||
725 | struct generic_link_hash_table *ret; |
||
726 | bfd_size_type amt = sizeof (struct generic_link_hash_table); |
||
727 | |||
728 | ret = (struct generic_link_hash_table *) bfd_malloc (amt); |
||
729 | if (ret == NULL) |
||
730 | return NULL; |
||
731 | if (! _bfd_link_hash_table_init (&ret->root, abfd, |
||
732 | _bfd_generic_link_hash_newfunc, |
||
733 | sizeof (struct generic_link_hash_entry))) |
||
734 | { |
||
735 | free (ret); |
||
736 | return NULL; |
||
737 | } |
||
738 | return &ret->root; |
||
739 | } |
||
740 | |||
741 | void |
||
742 | _bfd_generic_link_hash_table_free (struct bfd_link_hash_table *hash) |
||
743 | { |
||
744 | struct generic_link_hash_table *ret |
||
745 | = (struct generic_link_hash_table *) hash; |
||
746 | |||
747 | bfd_hash_table_free (&ret->root.table); |
||
748 | free (ret); |
||
749 | } |
||
750 | |||
751 | /* Grab the symbols for an object file when doing a generic link. We |
||
752 | store the symbols in the outsymbols field. We need to keep them |
||
753 | around for the entire link to ensure that we only read them once. |
||
754 | If we read them multiple times, we might wind up with relocs and |
||
755 | the hash table pointing to different instances of the symbol |
||
756 | structure. */ |
||
757 | |||
758 | bfd_boolean |
||
759 | bfd_generic_link_read_symbols (bfd *abfd) |
||
760 | { |
||
761 | if (bfd_get_outsymbols (abfd) == NULL) |
||
762 | { |
||
763 | long symsize; |
||
764 | long symcount; |
||
765 | |||
766 | symsize = bfd_get_symtab_upper_bound (abfd); |
||
767 | if (symsize < 0) |
||
768 | return FALSE; |
||
769 | bfd_get_outsymbols (abfd) = (struct bfd_symbol **) bfd_alloc (abfd, |
||
770 | symsize); |
||
771 | if (bfd_get_outsymbols (abfd) == NULL && symsize != 0) |
||
772 | return FALSE; |
||
773 | symcount = bfd_canonicalize_symtab (abfd, bfd_get_outsymbols (abfd)); |
||
774 | if (symcount < 0) |
||
775 | return FALSE; |
||
776 | bfd_get_symcount (abfd) = symcount; |
||
777 | } |
||
778 | |||
779 | return TRUE; |
||
780 | } |
||
781 | |||
782 | /* Generic function to add symbols to from an object file to the |
||
783 | global hash table. This version does not automatically collect |
||
784 | constructors by name. */ |
||
785 | |||
786 | bfd_boolean |
||
787 | _bfd_generic_link_add_symbols (bfd *abfd, struct bfd_link_info *info) |
||
788 | { |
||
789 | return generic_link_add_symbols (abfd, info, FALSE); |
||
790 | } |
||
791 | |||
792 | /* Generic function to add symbols from an object file to the global |
||
793 | hash table. This version automatically collects constructors by |
||
794 | name, as the collect2 program does. It should be used for any |
||
795 | target which does not provide some other mechanism for setting up |
||
796 | constructors and destructors; these are approximately those targets |
||
797 | for which gcc uses collect2 and do not support stabs. */ |
||
798 | |||
799 | bfd_boolean |
||
800 | _bfd_generic_link_add_symbols_collect (bfd *abfd, struct bfd_link_info *info) |
||
801 | { |
||
802 | return generic_link_add_symbols (abfd, info, TRUE); |
||
803 | } |
||
804 | |||
805 | /* Indicate that we are only retrieving symbol values from this |
||
806 | section. We want the symbols to act as though the values in the |
||
807 | file are absolute. */ |
||
808 | |||
809 | void |
||
810 | _bfd_generic_link_just_syms (asection *sec, |
||
811 | struct bfd_link_info *info ATTRIBUTE_UNUSED) |
||
812 | { |
||
813 | sec->sec_info_type = SEC_INFO_TYPE_JUST_SYMS; |
||
814 | sec->output_section = bfd_abs_section_ptr; |
||
815 | sec->output_offset = sec->vma; |
||
816 | } |
||
817 | |||
818 | /* Copy the type of a symbol assiciated with a linker hast table entry. |
||
819 | Override this so that symbols created in linker scripts get their |
||
820 | type from the RHS of the assignment. |
||
821 | The default implementation does nothing. */ |
||
822 | void |
||
823 | _bfd_generic_copy_link_hash_symbol_type (bfd *abfd ATTRIBUTE_UNUSED, |
||
824 | struct bfd_link_hash_entry * hdest ATTRIBUTE_UNUSED, |
||
825 | struct bfd_link_hash_entry * hsrc ATTRIBUTE_UNUSED) |
||
826 | { |
||
827 | } |
||
828 | |||
829 | /* Add symbols from an object file to the global hash table. */ |
||
830 | |||
831 | static bfd_boolean |
||
832 | generic_link_add_symbols (bfd *abfd, |
||
833 | struct bfd_link_info *info, |
||
834 | bfd_boolean collect) |
||
835 | { |
||
836 | bfd_boolean ret; |
||
837 | |||
838 | switch (bfd_get_format (abfd)) |
||
839 | { |
||
840 | case bfd_object: |
||
841 | ret = generic_link_add_object_symbols (abfd, info, collect); |
||
842 | break; |
||
843 | case bfd_archive: |
||
844 | ret = (_bfd_generic_link_add_archive_symbols |
||
845 | (abfd, info, |
||
846 | (collect |
||
847 | ? generic_link_check_archive_element_collect |
||
848 | : generic_link_check_archive_element_no_collect))); |
||
849 | break; |
||
850 | default: |
||
851 | bfd_set_error (bfd_error_wrong_format); |
||
852 | ret = FALSE; |
||
853 | } |
||
854 | |||
855 | return ret; |
||
856 | } |
||
857 | |||
858 | /* Add symbols from an object file to the global hash table. */ |
||
859 | |||
860 | static bfd_boolean |
||
861 | generic_link_add_object_symbols (bfd *abfd, |
||
862 | struct bfd_link_info *info, |
||
863 | bfd_boolean collect) |
||
864 | { |
||
865 | bfd_size_type symcount; |
||
866 | struct bfd_symbol **outsyms; |
||
867 | |||
868 | if (!bfd_generic_link_read_symbols (abfd)) |
||
869 | return FALSE; |
||
870 | symcount = _bfd_generic_link_get_symcount (abfd); |
||
871 | outsyms = _bfd_generic_link_get_symbols (abfd); |
||
872 | return generic_link_add_symbol_list (abfd, info, symcount, outsyms, collect); |
||
873 | } |
||
874 | |||
875 | /* We build a hash table of all symbols defined in an archive. */ |
||
876 | |||
877 | /* An archive symbol may be defined by multiple archive elements. |
||
878 | This linked list is used to hold the elements. */ |
||
879 | |||
880 | struct archive_list |
||
881 | { |
||
882 | struct archive_list *next; |
||
883 | unsigned int indx; |
||
884 | }; |
||
885 | |||
886 | /* An entry in an archive hash table. */ |
||
887 | |||
888 | struct archive_hash_entry |
||
889 | { |
||
890 | struct bfd_hash_entry root; |
||
891 | /* Where the symbol is defined. */ |
||
892 | struct archive_list *defs; |
||
893 | }; |
||
894 | |||
895 | /* An archive hash table itself. */ |
||
896 | |||
897 | struct archive_hash_table |
||
898 | { |
||
899 | struct bfd_hash_table table; |
||
900 | }; |
||
901 | |||
902 | /* Create a new entry for an archive hash table. */ |
||
903 | |||
904 | static struct bfd_hash_entry * |
||
905 | archive_hash_newfunc (struct bfd_hash_entry *entry, |
||
906 | struct bfd_hash_table *table, |
||
907 | const char *string) |
||
908 | { |
||
909 | struct archive_hash_entry *ret = (struct archive_hash_entry *) entry; |
||
910 | |||
911 | /* Allocate the structure if it has not already been allocated by a |
||
912 | subclass. */ |
||
913 | if (ret == NULL) |
||
914 | ret = (struct archive_hash_entry *) |
||
915 | bfd_hash_allocate (table, sizeof (struct archive_hash_entry)); |
||
916 | if (ret == NULL) |
||
917 | return NULL; |
||
918 | |||
919 | /* Call the allocation method of the superclass. */ |
||
920 | ret = ((struct archive_hash_entry *) |
||
921 | bfd_hash_newfunc ((struct bfd_hash_entry *) ret, table, string)); |
||
922 | |||
923 | if (ret) |
||
924 | { |
||
925 | /* Initialize the local fields. */ |
||
926 | ret->defs = NULL; |
||
927 | } |
||
928 | |||
929 | return &ret->root; |
||
930 | } |
||
931 | |||
932 | /* Initialize an archive hash table. */ |
||
933 | |||
934 | static bfd_boolean |
||
935 | archive_hash_table_init |
||
936 | (struct archive_hash_table *table, |
||
937 | struct bfd_hash_entry *(*newfunc) (struct bfd_hash_entry *, |
||
938 | struct bfd_hash_table *, |
||
939 | const char *), |
||
940 | unsigned int entsize) |
||
941 | { |
||
942 | return bfd_hash_table_init (&table->table, newfunc, entsize); |
||
943 | } |
||
944 | |||
945 | /* Look up an entry in an archive hash table. */ |
||
946 | |||
947 | #define archive_hash_lookup(t, string, create, copy) \ |
||
948 | ((struct archive_hash_entry *) \ |
||
949 | bfd_hash_lookup (&(t)->table, (string), (create), (copy))) |
||
950 | |||
951 | /* Allocate space in an archive hash table. */ |
||
952 | |||
953 | #define archive_hash_allocate(t, size) bfd_hash_allocate (&(t)->table, (size)) |
||
954 | |||
955 | /* Free an archive hash table. */ |
||
956 | |||
957 | #define archive_hash_table_free(t) bfd_hash_table_free (&(t)->table) |
||
958 | |||
959 | /* Generic function to add symbols from an archive file to the global |
||
960 | hash file. This function presumes that the archive symbol table |
||
961 | has already been read in (this is normally done by the |
||
962 | bfd_check_format entry point). It looks through the undefined and |
||
963 | common symbols and searches the archive symbol table for them. If |
||
964 | it finds an entry, it includes the associated object file in the |
||
965 | link. |
||
966 | |||
967 | The old linker looked through the archive symbol table for |
||
968 | undefined symbols. We do it the other way around, looking through |
||
969 | undefined symbols for symbols defined in the archive. The |
||
970 | advantage of the newer scheme is that we only have to look through |
||
971 | the list of undefined symbols once, whereas the old method had to |
||
972 | re-search the symbol table each time a new object file was added. |
||
973 | |||
974 | The CHECKFN argument is used to see if an object file should be |
||
975 | included. CHECKFN should set *PNEEDED to TRUE if the object file |
||
976 | should be included, and must also call the bfd_link_info |
||
977 | add_archive_element callback function and handle adding the symbols |
||
978 | to the global hash table. CHECKFN must notice if the callback |
||
979 | indicates a substitute BFD, and arrange to add those symbols instead |
||
980 | if it does so. CHECKFN should only return FALSE if some sort of |
||
981 | error occurs. |
||
982 | |||
983 | For some formats, such as a.out, it is possible to look through an |
||
984 | object file but not actually include it in the link. The |
||
985 | archive_pass field in a BFD is used to avoid checking the symbols |
||
986 | of an object files too many times. When an object is included in |
||
987 | the link, archive_pass is set to -1. If an object is scanned but |
||
988 | not included, archive_pass is set to the pass number. The pass |
||
989 | number is incremented each time a new object file is included. The |
||
990 | pass number is used because when a new object file is included it |
||
991 | may create new undefined symbols which cause a previously examined |
||
992 | object file to be included. */ |
||
993 | |||
994 | bfd_boolean |
||
995 | _bfd_generic_link_add_archive_symbols |
||
996 | (bfd *abfd, |
||
997 | struct bfd_link_info *info, |
||
998 | bfd_boolean (*checkfn) (bfd *, struct bfd_link_info *, bfd_boolean *)) |
||
999 | { |
||
1000 | carsym *arsyms; |
||
1001 | carsym *arsym_end; |
||
1002 | register carsym *arsym; |
||
1003 | int pass; |
||
1004 | struct archive_hash_table arsym_hash; |
||
1005 | unsigned int indx; |
||
1006 | struct bfd_link_hash_entry **pundef; |
||
1007 | |||
1008 | if (! bfd_has_map (abfd)) |
||
1009 | { |
||
1010 | /* An empty archive is a special case. */ |
||
1011 | if (bfd_openr_next_archived_file (abfd, NULL) == NULL) |
||
1012 | return TRUE; |
||
1013 | bfd_set_error (bfd_error_no_armap); |
||
1014 | return FALSE; |
||
1015 | } |
||
1016 | |||
1017 | arsyms = bfd_ardata (abfd)->symdefs; |
||
1018 | arsym_end = arsyms + bfd_ardata (abfd)->symdef_count; |
||
1019 | |||
1020 | /* In order to quickly determine whether an symbol is defined in |
||
1021 | this archive, we build a hash table of the symbols. */ |
||
1022 | if (! archive_hash_table_init (&arsym_hash, archive_hash_newfunc, |
||
1023 | sizeof (struct archive_hash_entry))) |
||
1024 | return FALSE; |
||
1025 | for (arsym = arsyms, indx = 0; arsym < arsym_end; arsym++, indx++) |
||
1026 | { |
||
1027 | struct archive_hash_entry *arh; |
||
1028 | struct archive_list *l, **pp; |
||
1029 | |||
1030 | arh = archive_hash_lookup (&arsym_hash, arsym->name, TRUE, FALSE); |
||
1031 | if (arh == NULL) |
||
1032 | goto error_return; |
||
1033 | l = ((struct archive_list *) |
||
1034 | archive_hash_allocate (&arsym_hash, sizeof (struct archive_list))); |
||
1035 | if (l == NULL) |
||
1036 | goto error_return; |
||
1037 | l->indx = indx; |
||
1038 | for (pp = &arh->defs; *pp != NULL; pp = &(*pp)->next) |
||
1039 | ; |
||
1040 | *pp = l; |
||
1041 | l->next = NULL; |
||
1042 | } |
||
1043 | |||
1044 | /* The archive_pass field in the archive itself is used to |
||
1045 | initialize PASS, sine we may search the same archive multiple |
||
1046 | times. */ |
||
1047 | pass = abfd->archive_pass + 1; |
||
1048 | |||
1049 | /* New undefined symbols are added to the end of the list, so we |
||
1050 | only need to look through it once. */ |
||
1051 | pundef = &info->hash->undefs; |
||
1052 | while (*pundef != NULL) |
||
1053 | { |
||
1054 | struct bfd_link_hash_entry *h; |
||
1055 | struct archive_hash_entry *arh; |
||
1056 | struct archive_list *l; |
||
1057 | |||
1058 | h = *pundef; |
||
1059 | |||
1060 | /* When a symbol is defined, it is not necessarily removed from |
||
1061 | the list. */ |
||
1062 | if (h->type != bfd_link_hash_undefined |
||
1063 | && h->type != bfd_link_hash_common) |
||
1064 | { |
||
1065 | /* Remove this entry from the list, for general cleanliness |
||
1066 | and because we are going to look through the list again |
||
1067 | if we search any more libraries. We can't remove the |
||
1068 | entry if it is the tail, because that would lose any |
||
1069 | entries we add to the list later on (it would also cause |
||
1070 | us to lose track of whether the symbol has been |
||
1071 | referenced). */ |
||
1072 | if (*pundef != info->hash->undefs_tail) |
||
1073 | *pundef = (*pundef)->u.undef.next; |
||
1074 | else |
||
1075 | pundef = &(*pundef)->u.undef.next; |
||
1076 | continue; |
||
1077 | } |
||
1078 | |||
1079 | /* Look for this symbol in the archive symbol map. */ |
||
1080 | arh = archive_hash_lookup (&arsym_hash, h->root.string, FALSE, FALSE); |
||
1081 | if (arh == NULL) |
||
1082 | { |
||
1083 | /* If we haven't found the exact symbol we're looking for, |
||
1084 | let's look for its import thunk */ |
||
1085 | if (info->pei386_auto_import) |
||
1086 | { |
||
1087 | bfd_size_type amt = strlen (h->root.string) + 10; |
||
1088 | char *buf = (char *) bfd_malloc (amt); |
||
1089 | if (buf == NULL) |
||
1090 | return FALSE; |
||
1091 | |||
1092 | sprintf (buf, "__imp_%s", h->root.string); |
||
1093 | arh = archive_hash_lookup (&arsym_hash, buf, FALSE, FALSE); |
||
1094 | free(buf); |
||
1095 | } |
||
1096 | if (arh == NULL) |
||
1097 | { |
||
1098 | pundef = &(*pundef)->u.undef.next; |
||
1099 | continue; |
||
1100 | } |
||
1101 | } |
||
1102 | /* Look at all the objects which define this symbol. */ |
||
1103 | for (l = arh->defs; l != NULL; l = l->next) |
||
1104 | { |
||
1105 | bfd *element; |
||
1106 | bfd_boolean needed; |
||
1107 | |||
1108 | /* If the symbol has gotten defined along the way, quit. */ |
||
1109 | if (h->type != bfd_link_hash_undefined |
||
1110 | && h->type != bfd_link_hash_common) |
||
1111 | break; |
||
1112 | |||
1113 | element = bfd_get_elt_at_index (abfd, l->indx); |
||
1114 | if (element == NULL) |
||
1115 | goto error_return; |
||
1116 | |||
1117 | /* If we've already included this element, or if we've |
||
1118 | already checked it on this pass, continue. */ |
||
1119 | if (element->archive_pass == -1 |
||
1120 | || element->archive_pass == pass) |
||
1121 | continue; |
||
1122 | |||
1123 | /* If we can't figure this element out, just ignore it. */ |
||
1124 | if (! bfd_check_format (element, bfd_object)) |
||
1125 | { |
||
1126 | element->archive_pass = -1; |
||
1127 | continue; |
||
1128 | } |
||
1129 | |||
1130 | /* CHECKFN will see if this element should be included, and |
||
1131 | go ahead and include it if appropriate. */ |
||
1132 | if (! (*checkfn) (element, info, &needed)) |
||
1133 | goto error_return; |
||
1134 | |||
1135 | if (! needed) |
||
1136 | element->archive_pass = pass; |
||
1137 | else |
||
1138 | { |
||
1139 | element->archive_pass = -1; |
||
1140 | |||
1141 | /* Increment the pass count to show that we may need to |
||
1142 | recheck object files which were already checked. */ |
||
1143 | ++pass; |
||
1144 | } |
||
1145 | } |
||
1146 | |||
1147 | pundef = &(*pundef)->u.undef.next; |
||
1148 | } |
||
1149 | |||
1150 | archive_hash_table_free (&arsym_hash); |
||
1151 | |||
1152 | /* Save PASS in case we are called again. */ |
||
1153 | abfd->archive_pass = pass; |
||
1154 | |||
1155 | return TRUE; |
||
1156 | |||
1157 | error_return: |
||
1158 | archive_hash_table_free (&arsym_hash); |
||
1159 | return FALSE; |
||
1160 | } |
||
1161 | |||
1162 | /* See if we should include an archive element. This version is used |
||
1163 | when we do not want to automatically collect constructors based on |
||
1164 | the symbol name, presumably because we have some other mechanism |
||
1165 | for finding them. */ |
||
1166 | |||
1167 | static bfd_boolean |
||
1168 | generic_link_check_archive_element_no_collect ( |
||
1169 | bfd *abfd, |
||
1170 | struct bfd_link_info *info, |
||
1171 | bfd_boolean *pneeded) |
||
1172 | { |
||
1173 | return generic_link_check_archive_element (abfd, info, pneeded, FALSE); |
||
1174 | } |
||
1175 | |||
1176 | /* See if we should include an archive element. This version is used |
||
1177 | when we want to automatically collect constructors based on the |
||
1178 | symbol name, as collect2 does. */ |
||
1179 | |||
1180 | static bfd_boolean |
||
1181 | generic_link_check_archive_element_collect (bfd *abfd, |
||
1182 | struct bfd_link_info *info, |
||
1183 | bfd_boolean *pneeded) |
||
1184 | { |
||
1185 | return generic_link_check_archive_element (abfd, info, pneeded, TRUE); |
||
1186 | } |
||
1187 | |||
1188 | /* See if we should include an archive element. Optionally collect |
||
1189 | constructors. */ |
||
1190 | |||
1191 | static bfd_boolean |
||
1192 | generic_link_check_archive_element (bfd *abfd, |
||
1193 | struct bfd_link_info *info, |
||
1194 | bfd_boolean *pneeded, |
||
1195 | bfd_boolean collect) |
||
1196 | { |
||
1197 | asymbol **pp, **ppend; |
||
1198 | |||
1199 | *pneeded = FALSE; |
||
1200 | |||
1201 | if (!bfd_generic_link_read_symbols (abfd)) |
||
1202 | return FALSE; |
||
1203 | |||
1204 | pp = _bfd_generic_link_get_symbols (abfd); |
||
1205 | ppend = pp + _bfd_generic_link_get_symcount (abfd); |
||
1206 | for (; pp < ppend; pp++) |
||
1207 | { |
||
1208 | asymbol *p; |
||
1209 | struct bfd_link_hash_entry *h; |
||
1210 | |||
1211 | p = *pp; |
||
1212 | |||
1213 | /* We are only interested in globally visible symbols. */ |
||
1214 | if (! bfd_is_com_section (p->section) |
||
1215 | && (p->flags & (BSF_GLOBAL | BSF_INDIRECT | BSF_WEAK)) == 0) |
||
1216 | continue; |
||
1217 | |||
1218 | /* We are only interested if we know something about this |
||
1219 | symbol, and it is undefined or common. An undefined weak |
||
1220 | symbol (type bfd_link_hash_undefweak) is not considered to be |
||
1221 | a reference when pulling files out of an archive. See the |
||
1222 | SVR4 ABI, p. 4-27. */ |
||
1223 | h = bfd_link_hash_lookup (info->hash, bfd_asymbol_name (p), FALSE, |
||
1224 | FALSE, TRUE); |
||
1225 | if (h == NULL |
||
1226 | || (h->type != bfd_link_hash_undefined |
||
1227 | && h->type != bfd_link_hash_common)) |
||
1228 | continue; |
||
1229 | |||
1230 | /* P is a symbol we are looking for. */ |
||
1231 | |||
1232 | if (! bfd_is_com_section (p->section)) |
||
1233 | { |
||
1234 | bfd_size_type symcount; |
||
1235 | asymbol **symbols; |
||
1236 | bfd *oldbfd = abfd; |
||
1237 | |||
1238 | /* This object file defines this symbol, so pull it in. */ |
||
1239 | if (!(*info->callbacks |
||
1240 | ->add_archive_element) (info, abfd, bfd_asymbol_name (p), |
||
1241 | &abfd)) |
||
1242 | return FALSE; |
||
1243 | /* Potentially, the add_archive_element hook may have set a |
||
1244 | substitute BFD for us. */ |
||
1245 | if (abfd != oldbfd |
||
1246 | && !bfd_generic_link_read_symbols (abfd)) |
||
1247 | return FALSE; |
||
1248 | symcount = _bfd_generic_link_get_symcount (abfd); |
||
1249 | symbols = _bfd_generic_link_get_symbols (abfd); |
||
1250 | if (! generic_link_add_symbol_list (abfd, info, symcount, |
||
1251 | symbols, collect)) |
||
1252 | return FALSE; |
||
1253 | *pneeded = TRUE; |
||
1254 | return TRUE; |
||
1255 | } |
||
1256 | |||
1257 | /* P is a common symbol. */ |
||
1258 | |||
1259 | if (h->type == bfd_link_hash_undefined) |
||
1260 | { |
||
1261 | bfd *symbfd; |
||
1262 | bfd_vma size; |
||
1263 | unsigned int power; |
||
1264 | |||
1265 | symbfd = h->u.undef.abfd; |
||
1266 | if (symbfd == NULL) |
||
1267 | { |
||
1268 | /* This symbol was created as undefined from outside |
||
1269 | BFD. We assume that we should link in the object |
||
1270 | file. This is for the -u option in the linker. */ |
||
1271 | if (!(*info->callbacks |
||
1272 | ->add_archive_element) (info, abfd, bfd_asymbol_name (p), |
||
1273 | &abfd)) |
||
1274 | return FALSE; |
||
1275 | /* Potentially, the add_archive_element hook may have set a |
||
1276 | substitute BFD for us. But no symbols are going to get |
||
1277 | registered by anything we're returning to from here. */ |
||
1278 | *pneeded = TRUE; |
||
1279 | return TRUE; |
||
1280 | } |
||
1281 | |||
1282 | /* Turn the symbol into a common symbol but do not link in |
||
1283 | the object file. This is how a.out works. Object |
||
1284 | formats that require different semantics must implement |
||
1285 | this function differently. This symbol is already on the |
||
1286 | undefs list. We add the section to a common section |
||
1287 | attached to symbfd to ensure that it is in a BFD which |
||
1288 | will be linked in. */ |
||
1289 | h->type = bfd_link_hash_common; |
||
1290 | h->u.c.p = (struct bfd_link_hash_common_entry *) |
||
1291 | bfd_hash_allocate (&info->hash->table, |
||
1292 | sizeof (struct bfd_link_hash_common_entry)); |
||
1293 | if (h->u.c.p == NULL) |
||
1294 | return FALSE; |
||
1295 | |||
1296 | size = bfd_asymbol_value (p); |
||
1297 | h->u.c.size = size; |
||
1298 | |||
1299 | power = bfd_log2 (size); |
||
1300 | if (power > 4) |
||
1301 | power = 4; |
||
1302 | h->u.c.p->alignment_power = power; |
||
1303 | |||
1304 | if (p->section == bfd_com_section_ptr) |
||
1305 | h->u.c.p->section = bfd_make_section_old_way (symbfd, "COMMON"); |
||
1306 | else |
||
1307 | h->u.c.p->section = bfd_make_section_old_way (symbfd, |
||
1308 | p->section->name); |
||
1309 | h->u.c.p->section->flags |= SEC_ALLOC; |
||
1310 | } |
||
1311 | else |
||
1312 | { |
||
1313 | /* Adjust the size of the common symbol if necessary. This |
||
1314 | is how a.out works. Object formats that require |
||
1315 | different semantics must implement this function |
||
1316 | differently. */ |
||
1317 | if (bfd_asymbol_value (p) > h->u.c.size) |
||
1318 | h->u.c.size = bfd_asymbol_value (p); |
||
1319 | } |
||
1320 | } |
||
1321 | |||
1322 | /* This archive element is not needed. */ |
||
1323 | return TRUE; |
||
1324 | } |
||
1325 | |||
1326 | /* Add the symbols from an object file to the global hash table. ABFD |
||
1327 | is the object file. INFO is the linker information. SYMBOL_COUNT |
||
1328 | is the number of symbols. SYMBOLS is the list of symbols. COLLECT |
||
1329 | is TRUE if constructors should be automatically collected by name |
||
1330 | as is done by collect2. */ |
||
1331 | |||
1332 | static bfd_boolean |
||
1333 | generic_link_add_symbol_list (bfd *abfd, |
||
1334 | struct bfd_link_info *info, |
||
1335 | bfd_size_type symbol_count, |
||
1336 | asymbol **symbols, |
||
1337 | bfd_boolean collect) |
||
1338 | { |
||
1339 | asymbol **pp, **ppend; |
||
1340 | |||
1341 | pp = symbols; |
||
1342 | ppend = symbols + symbol_count; |
||
1343 | for (; pp < ppend; pp++) |
||
1344 | { |
||
1345 | asymbol *p; |
||
1346 | |||
1347 | p = *pp; |
||
1348 | |||
1349 | if ((p->flags & (BSF_INDIRECT |
||
1350 | | BSF_WARNING |
||
1351 | | BSF_GLOBAL |
||
1352 | | BSF_CONSTRUCTOR |
||
1353 | | BSF_WEAK)) != 0 |
||
1354 | || bfd_is_und_section (bfd_get_section (p)) |
||
1355 | || bfd_is_com_section (bfd_get_section (p)) |
||
1356 | || bfd_is_ind_section (bfd_get_section (p))) |
||
1357 | { |
||
1358 | const char *name; |
||
1359 | const char *string; |
||
1360 | struct generic_link_hash_entry *h; |
||
1361 | struct bfd_link_hash_entry *bh; |
||
1362 | |||
1363 | string = name = bfd_asymbol_name (p); |
||
1364 | if (((p->flags & BSF_INDIRECT) != 0 |
||
1365 | || bfd_is_ind_section (p->section)) |
||
1366 | && pp + 1 < ppend) |
||
1367 | { |
||
1368 | pp++; |
||
1369 | string = bfd_asymbol_name (*pp); |
||
1370 | } |
||
1371 | else if ((p->flags & BSF_WARNING) != 0 |
||
1372 | && pp + 1 < ppend) |
||
1373 | { |
||
1374 | /* The name of P is actually the warning string, and the |
||
1375 | next symbol is the one to warn about. */ |
||
1376 | pp++; |
||
1377 | name = bfd_asymbol_name (*pp); |
||
1378 | } |
||
1379 | |||
1380 | bh = NULL; |
||
1381 | if (! (_bfd_generic_link_add_one_symbol |
||
1382 | (info, abfd, name, p->flags, bfd_get_section (p), |
||
1383 | p->value, string, FALSE, collect, &bh))) |
||
1384 | return FALSE; |
||
1385 | h = (struct generic_link_hash_entry *) bh; |
||
1386 | |||
1387 | /* If this is a constructor symbol, and the linker didn't do |
||
1388 | anything with it, then we want to just pass the symbol |
||
1389 | through to the output file. This will happen when |
||
1390 | linking with -r. */ |
||
1391 | if ((p->flags & BSF_CONSTRUCTOR) != 0 |
||
1392 | && (h == NULL || h->root.type == bfd_link_hash_new)) |
||
1393 | { |
||
1394 | p->udata.p = NULL; |
||
1395 | continue; |
||
1396 | } |
||
1397 | |||
1398 | /* Save the BFD symbol so that we don't lose any backend |
||
1399 | specific information that may be attached to it. We only |
||
1400 | want this one if it gives more information than the |
||
1401 | existing one; we don't want to replace a defined symbol |
||
1402 | with an undefined one. This routine may be called with a |
||
1403 | hash table other than the generic hash table, so we only |
||
1404 | do this if we are certain that the hash table is a |
||
1405 | generic one. */ |
||
1406 | if (info->output_bfd->xvec == abfd->xvec) |
||
1407 | { |
||
1408 | if (h->sym == NULL |
||
1409 | || (! bfd_is_und_section (bfd_get_section (p)) |
||
1410 | && (! bfd_is_com_section (bfd_get_section (p)) |
||
1411 | || bfd_is_und_section (bfd_get_section (h->sym))))) |
||
1412 | { |
||
1413 | h->sym = p; |
||
1414 | /* BSF_OLD_COMMON is a hack to support COFF reloc |
||
1415 | reading, and it should go away when the COFF |
||
1416 | linker is switched to the new version. */ |
||
1417 | if (bfd_is_com_section (bfd_get_section (p))) |
||
1418 | p->flags |= BSF_OLD_COMMON; |
||
1419 | } |
||
1420 | } |
||
1421 | |||
1422 | /* Store a back pointer from the symbol to the hash |
||
1423 | table entry for the benefit of relaxation code until |
||
1424 | it gets rewritten to not use asymbol structures. |
||
1425 | Setting this is also used to check whether these |
||
1426 | symbols were set up by the generic linker. */ |
||
1427 | p->udata.p = h; |
||
1428 | } |
||
1429 | } |
||
1430 | |||
1431 | return TRUE; |
||
1432 | } |
||
1433 | |||
1434 | /* We use a state table to deal with adding symbols from an object |
||
1435 | file. The first index into the state table describes the symbol |
||
1436 | from the object file. The second index into the state table is the |
||
1437 | type of the symbol in the hash table. */ |
||
1438 | |||
1439 | /* The symbol from the object file is turned into one of these row |
||
1440 | values. */ |
||
1441 | |||
1442 | enum link_row |
||
1443 | { |
||
1444 | UNDEF_ROW, /* Undefined. */ |
||
1445 | UNDEFW_ROW, /* Weak undefined. */ |
||
1446 | DEF_ROW, /* Defined. */ |
||
1447 | DEFW_ROW, /* Weak defined. */ |
||
1448 | COMMON_ROW, /* Common. */ |
||
1449 | INDR_ROW, /* Indirect. */ |
||
1450 | WARN_ROW, /* Warning. */ |
||
1451 | SET_ROW /* Member of set. */ |
||
1452 | }; |
||
1453 | |||
1454 | /* apparently needed for Hitachi 3050R(HI-UX/WE2)? */ |
||
1455 | #undef FAIL |
||
1456 | |||
1457 | /* The actions to take in the state table. */ |
||
1458 | |||
1459 | enum link_action |
||
1460 | { |
||
1461 | FAIL, /* Abort. */ |
||
1462 | UND, /* Mark symbol undefined. */ |
||
1463 | WEAK, /* Mark symbol weak undefined. */ |
||
1464 | DEF, /* Mark symbol defined. */ |
||
1465 | DEFW, /* Mark symbol weak defined. */ |
||
1466 | COM, /* Mark symbol common. */ |
||
1467 | REF, /* Mark defined symbol referenced. */ |
||
1468 | CREF, /* Possibly warn about common reference to defined symbol. */ |
||
1469 | CDEF, /* Define existing common symbol. */ |
||
1470 | NOACT, /* No action. */ |
||
1471 | BIG, /* Mark symbol common using largest size. */ |
||
1472 | MDEF, /* Multiple definition error. */ |
||
1473 | MIND, /* Multiple indirect symbols. */ |
||
1474 | IND, /* Make indirect symbol. */ |
||
1475 | CIND, /* Make indirect symbol from existing common symbol. */ |
||
1476 | SET, /* Add value to set. */ |
||
1477 | MWARN, /* Make warning symbol. */ |
||
1478 | WARN, /* Issue warning. */ |
||
1479 | CWARN, /* Warn if referenced, else MWARN. */ |
||
1480 | CYCLE, /* Repeat with symbol pointed to. */ |
||
1481 | REFC, /* Mark indirect symbol referenced and then CYCLE. */ |
||
1482 | WARNC /* Issue warning and then CYCLE. */ |
||
1483 | }; |
||
1484 | |||
1485 | /* The state table itself. The first index is a link_row and the |
||
1486 | second index is a bfd_link_hash_type. */ |
||
1487 | |||
1488 | static const enum link_action link_action[8][8] = |
||
1489 | { |
||
1490 | /* current\prev new undef undefw def defw com indr warn */ |
||
1491 | /* UNDEF_ROW */ {UND, NOACT, UND, REF, REF, NOACT, REFC, WARNC }, |
||
1492 | /* UNDEFW_ROW */ {WEAK, NOACT, NOACT, REF, REF, NOACT, REFC, WARNC }, |
||
1493 | /* DEF_ROW */ {DEF, DEF, DEF, MDEF, DEF, CDEF, MDEF, CYCLE }, |
||
1494 | /* DEFW_ROW */ {DEFW, DEFW, DEFW, NOACT, NOACT, NOACT, NOACT, CYCLE }, |
||
1495 | /* COMMON_ROW */ {COM, COM, COM, CREF, COM, BIG, REFC, WARNC }, |
||
1496 | /* INDR_ROW */ {IND, IND, IND, MDEF, IND, CIND, MIND, CYCLE }, |
||
1497 | /* WARN_ROW */ {MWARN, WARN, WARN, CWARN, CWARN, WARN, CWARN, NOACT }, |
||
1498 | /* SET_ROW */ {SET, SET, SET, SET, SET, SET, CYCLE, CYCLE } |
||
1499 | }; |
||
1500 | |||
1501 | /* Most of the entries in the LINK_ACTION table are straightforward, |
||
1502 | but a few are somewhat subtle. |
||
1503 | |||
1504 | A reference to an indirect symbol (UNDEF_ROW/indr or |
||
1505 | UNDEFW_ROW/indr) is counted as a reference both to the indirect |
||
1506 | symbol and to the symbol the indirect symbol points to. |
||
1507 | |||
1508 | A reference to a warning symbol (UNDEF_ROW/warn or UNDEFW_ROW/warn) |
||
1509 | causes the warning to be issued. |
||
1510 | |||
1511 | A common definition of an indirect symbol (COMMON_ROW/indr) is |
||
1512 | treated as a multiple definition error. Likewise for an indirect |
||
1513 | definition of a common symbol (INDR_ROW/com). |
||
1514 | |||
1515 | An indirect definition of a warning (INDR_ROW/warn) does not cause |
||
1516 | the warning to be issued. |
||
1517 | |||
1518 | If a warning is created for an indirect symbol (WARN_ROW/indr) no |
||
1519 | warning is created for the symbol the indirect symbol points to. |
||
1520 | |||
1521 | Adding an entry to a set does not count as a reference to a set, |
||
1522 | and no warning is issued (SET_ROW/warn). */ |
||
1523 | |||
1524 | /* Return the BFD in which a hash entry has been defined, if known. */ |
||
1525 | |||
1526 | static bfd * |
||
1527 | hash_entry_bfd (struct bfd_link_hash_entry *h) |
||
1528 | { |
||
1529 | while (h->type == bfd_link_hash_warning) |
||
1530 | h = h->u.i.link; |
||
1531 | switch (h->type) |
||
1532 | { |
||
1533 | default: |
||
1534 | return NULL; |
||
1535 | case bfd_link_hash_undefined: |
||
1536 | case bfd_link_hash_undefweak: |
||
1537 | return h->u.undef.abfd; |
||
1538 | case bfd_link_hash_defined: |
||
1539 | case bfd_link_hash_defweak: |
||
1540 | return h->u.def.section->owner; |
||
1541 | case bfd_link_hash_common: |
||
1542 | return h->u.c.p->section->owner; |
||
1543 | } |
||
1544 | /*NOTREACHED*/ |
||
1545 | } |
||
1546 | |||
1547 | /* Add a symbol to the global hash table. |
||
1548 | ABFD is the BFD the symbol comes from. |
||
1549 | NAME is the name of the symbol. |
||
1550 | FLAGS is the BSF_* bits associated with the symbol. |
||
1551 | SECTION is the section in which the symbol is defined; this may be |
||
1552 | bfd_und_section_ptr or bfd_com_section_ptr. |
||
1553 | VALUE is the value of the symbol, relative to the section. |
||
1554 | STRING is used for either an indirect symbol, in which case it is |
||
1555 | the name of the symbol to indirect to, or a warning symbol, in |
||
1556 | which case it is the warning string. |
||
1557 | COPY is TRUE if NAME or STRING must be copied into locally |
||
1558 | allocated memory if they need to be saved. |
||
1559 | COLLECT is TRUE if we should automatically collect gcc constructor |
||
1560 | or destructor names as collect2 does. |
||
1561 | HASHP, if not NULL, is a place to store the created hash table |
||
1562 | entry; if *HASHP is not NULL, the caller has already looked up |
||
1563 | the hash table entry, and stored it in *HASHP. */ |
||
1564 | |||
1565 | bfd_boolean |
||
1566 | _bfd_generic_link_add_one_symbol (struct bfd_link_info *info, |
||
1567 | bfd *abfd, |
||
1568 | const char *name, |
||
1569 | flagword flags, |
||
1570 | asection *section, |
||
1571 | bfd_vma value, |
||
1572 | const char *string, |
||
1573 | bfd_boolean copy, |
||
1574 | bfd_boolean collect, |
||
1575 | struct bfd_link_hash_entry **hashp) |
||
1576 | { |
||
1577 | enum link_row row; |
||
1578 | struct bfd_link_hash_entry *h; |
||
1579 | bfd_boolean cycle; |
||
1580 | |||
1581 | BFD_ASSERT (section != NULL); |
||
1582 | |||
1583 | if (bfd_is_ind_section (section) |
||
1584 | || (flags & BSF_INDIRECT) != 0) |
||
1585 | row = INDR_ROW; |
||
1586 | else if ((flags & BSF_WARNING) != 0) |
||
1587 | row = WARN_ROW; |
||
1588 | else if ((flags & BSF_CONSTRUCTOR) != 0) |
||
1589 | row = SET_ROW; |
||
1590 | else if (bfd_is_und_section (section)) |
||
1591 | { |
||
1592 | if ((flags & BSF_WEAK) != 0) |
||
1593 | row = UNDEFW_ROW; |
||
1594 | else |
||
1595 | row = UNDEF_ROW; |
||
1596 | } |
||
1597 | else if ((flags & BSF_WEAK) != 0) |
||
1598 | row = DEFW_ROW; |
||
1599 | else if (bfd_is_com_section (section)) |
||
1600 | row = COMMON_ROW; |
||
1601 | else |
||
1602 | row = DEF_ROW; |
||
1603 | |||
1604 | if (hashp != NULL && *hashp != NULL) |
||
1605 | h = *hashp; |
||
1606 | else |
||
1607 | { |
||
1608 | if (row == UNDEF_ROW || row == UNDEFW_ROW) |
||
1609 | h = bfd_wrapped_link_hash_lookup (abfd, info, name, TRUE, copy, FALSE); |
||
1610 | else |
||
1611 | h = bfd_link_hash_lookup (info->hash, name, TRUE, copy, FALSE); |
||
1612 | if (h == NULL) |
||
1613 | { |
||
1614 | if (hashp != NULL) |
||
1615 | *hashp = NULL; |
||
1616 | return FALSE; |
||
1617 | } |
||
1618 | } |
||
1619 | |||
1620 | if (info->notice_all |
||
1621 | || (info->notice_hash != NULL |
||
1622 | && bfd_hash_lookup (info->notice_hash, name, FALSE, FALSE) != NULL)) |
||
1623 | { |
||
1624 | if (! (*info->callbacks->notice) (info, h, |
||
1625 | abfd, section, value, flags, string)) |
||
1626 | return FALSE; |
||
1627 | } |
||
1628 | |||
1629 | if (hashp != NULL) |
||
1630 | *hashp = h; |
||
1631 | |||
1632 | do |
||
1633 | { |
||
1634 | enum link_action action; |
||
1635 | |||
1636 | cycle = FALSE; |
||
1637 | action = link_action[(int) row][(int) h->type]; |
||
1638 | switch (action) |
||
1639 | { |
||
1640 | case FAIL: |
||
1641 | abort (); |
||
1642 | |||
1643 | case NOACT: |
||
1644 | /* Do nothing. */ |
||
1645 | break; |
||
1646 | |||
1647 | case UND: |
||
1648 | /* Make a new undefined symbol. */ |
||
1649 | h->type = bfd_link_hash_undefined; |
||
1650 | h->u.undef.abfd = abfd; |
||
1651 | bfd_link_add_undef (info->hash, h); |
||
1652 | break; |
||
1653 | |||
1654 | case WEAK: |
||
1655 | /* Make a new weak undefined symbol. */ |
||
1656 | h->type = bfd_link_hash_undefweak; |
||
1657 | h->u.undef.abfd = abfd; |
||
1658 | break; |
||
1659 | |||
1660 | case CDEF: |
||
1661 | /* We have found a definition for a symbol which was |
||
1662 | previously common. */ |
||
1663 | BFD_ASSERT (h->type == bfd_link_hash_common); |
||
1664 | if (! ((*info->callbacks->multiple_common) |
||
1665 | (info, h, abfd, bfd_link_hash_defined, 0))) |
||
1666 | return FALSE; |
||
1667 | /* Fall through. */ |
||
1668 | case DEF: |
||
1669 | case DEFW: |
||
1670 | { |
||
1671 | enum bfd_link_hash_type oldtype; |
||
1672 | |||
1673 | /* Define a symbol. */ |
||
1674 | oldtype = h->type; |
||
1675 | if (action == DEFW) |
||
1676 | h->type = bfd_link_hash_defweak; |
||
1677 | else |
||
1678 | h->type = bfd_link_hash_defined; |
||
1679 | h->u.def.section = section; |
||
1680 | h->u.def.value = value; |
||
1681 | |||
1682 | /* If we have been asked to, we act like collect2 and |
||
1683 | identify all functions that might be global |
||
1684 | constructors and destructors and pass them up in a |
||
1685 | callback. We only do this for certain object file |
||
1686 | types, since many object file types can handle this |
||
1687 | automatically. */ |
||
1688 | if (collect && name[0] == '_') |
||
1689 | { |
||
1690 | const char *s; |
||
1691 | |||
1692 | /* A constructor or destructor name starts like this: |
||
1693 | _+GLOBAL_[_.$][ID][_.$] where the first [_.$] and |
||
1694 | the second are the same character (we accept any |
||
1695 | character there, in case a new object file format |
||
1696 | comes along with even worse naming restrictions). */ |
||
1697 | |||
1698 | #define CONS_PREFIX "GLOBAL_" |
||
1699 | #define CONS_PREFIX_LEN (sizeof CONS_PREFIX - 1) |
||
1700 | |||
1701 | s = name + 1; |
||
1702 | while (*s == '_') |
||
1703 | ++s; |
||
1704 | if (s[0] == 'G' && CONST_STRNEQ (s, CONS_PREFIX)) |
||
1705 | { |
||
1706 | char c; |
||
1707 | |||
1708 | c = s[CONS_PREFIX_LEN + 1]; |
||
1709 | if ((c == 'I' || c == 'D') |
||
1710 | && s[CONS_PREFIX_LEN] == s[CONS_PREFIX_LEN + 2]) |
||
1711 | { |
||
1712 | /* If this is a definition of a symbol which |
||
1713 | was previously weakly defined, we are in |
||
1714 | trouble. We have already added a |
||
1715 | constructor entry for the weak defined |
||
1716 | symbol, and now we are trying to add one |
||
1717 | for the new symbol. Fortunately, this case |
||
1718 | should never arise in practice. */ |
||
1719 | if (oldtype == bfd_link_hash_defweak) |
||
1720 | abort (); |
||
1721 | |||
1722 | if (! ((*info->callbacks->constructor) |
||
1723 | (info, c == 'I', |
||
1724 | h->root.string, abfd, section, value))) |
||
1725 | return FALSE; |
||
1726 | } |
||
1727 | } |
||
1728 | } |
||
1729 | } |
||
1730 | |||
1731 | break; |
||
1732 | |||
1733 | case COM: |
||
1734 | /* We have found a common definition for a symbol. */ |
||
1735 | if (h->type == bfd_link_hash_new) |
||
1736 | bfd_link_add_undef (info->hash, h); |
||
1737 | h->type = bfd_link_hash_common; |
||
1738 | h->u.c.p = (struct bfd_link_hash_common_entry *) |
||
1739 | bfd_hash_allocate (&info->hash->table, |
||
1740 | sizeof (struct bfd_link_hash_common_entry)); |
||
1741 | if (h->u.c.p == NULL) |
||
1742 | return FALSE; |
||
1743 | |||
1744 | h->u.c.size = value; |
||
1745 | |||
1746 | /* Select a default alignment based on the size. This may |
||
1747 | be overridden by the caller. */ |
||
1748 | { |
||
1749 | unsigned int power; |
||
1750 | |||
1751 | power = bfd_log2 (value); |
||
1752 | if (power > 4) |
||
1753 | power = 4; |
||
1754 | h->u.c.p->alignment_power = power; |
||
1755 | } |
||
1756 | |||
1757 | /* The section of a common symbol is only used if the common |
||
1758 | symbol is actually allocated. It basically provides a |
||
1759 | hook for the linker script to decide which output section |
||
1760 | the common symbols should be put in. In most cases, the |
||
1761 | section of a common symbol will be bfd_com_section_ptr, |
||
1762 | the code here will choose a common symbol section named |
||
1763 | "COMMON", and the linker script will contain *(COMMON) in |
||
1764 | the appropriate place. A few targets use separate common |
||
1765 | sections for small symbols, and they require special |
||
1766 | handling. */ |
||
1767 | if (section == bfd_com_section_ptr) |
||
1768 | { |
||
1769 | h->u.c.p->section = bfd_make_section_old_way (abfd, "COMMON"); |
||
1770 | h->u.c.p->section->flags |= SEC_ALLOC; |
||
1771 | } |
||
1772 | else if (section->owner != abfd) |
||
1773 | { |
||
1774 | h->u.c.p->section = bfd_make_section_old_way (abfd, |
||
1775 | section->name); |
||
1776 | h->u.c.p->section->flags |= SEC_ALLOC; |
||
1777 | } |
||
1778 | else |
||
1779 | h->u.c.p->section = section; |
||
1780 | break; |
||
1781 | |||
1782 | case REF: |
||
1783 | /* A reference to a defined symbol. */ |
||
1784 | if (h->u.undef.next == NULL && info->hash->undefs_tail != h) |
||
1785 | h->u.undef.next = h; |
||
1786 | break; |
||
1787 | |||
1788 | case BIG: |
||
1789 | /* We have found a common definition for a symbol which |
||
1790 | already had a common definition. Use the maximum of the |
||
1791 | two sizes, and use the section required by the larger symbol. */ |
||
1792 | BFD_ASSERT (h->type == bfd_link_hash_common); |
||
1793 | if (! ((*info->callbacks->multiple_common) |
||
1794 | (info, h, abfd, bfd_link_hash_common, value))) |
||
1795 | return FALSE; |
||
1796 | if (value > h->u.c.size) |
||
1797 | { |
||
1798 | unsigned int power; |
||
1799 | |||
1800 | h->u.c.size = value; |
||
1801 | |||
1802 | /* Select a default alignment based on the size. This may |
||
1803 | be overridden by the caller. */ |
||
1804 | power = bfd_log2 (value); |
||
1805 | if (power > 4) |
||
1806 | power = 4; |
||
1807 | h->u.c.p->alignment_power = power; |
||
1808 | |||
1809 | /* Some systems have special treatment for small commons, |
||
1810 | hence we want to select the section used by the larger |
||
1811 | symbol. This makes sure the symbol does not go in a |
||
1812 | small common section if it is now too large. */ |
||
1813 | if (section == bfd_com_section_ptr) |
||
1814 | { |
||
1815 | h->u.c.p->section |
||
1816 | = bfd_make_section_old_way (abfd, "COMMON"); |
||
1817 | h->u.c.p->section->flags |= SEC_ALLOC; |
||
1818 | } |
||
1819 | else if (section->owner != abfd) |
||
1820 | { |
||
1821 | h->u.c.p->section |
||
1822 | = bfd_make_section_old_way (abfd, section->name); |
||
1823 | h->u.c.p->section->flags |= SEC_ALLOC; |
||
1824 | } |
||
1825 | else |
||
1826 | h->u.c.p->section = section; |
||
1827 | } |
||
1828 | break; |
||
1829 | |||
1830 | case CREF: |
||
1831 | /* We have found a common definition for a symbol which |
||
1832 | was already defined. */ |
||
1833 | if (! ((*info->callbacks->multiple_common) |
||
1834 | (info, h, abfd, bfd_link_hash_common, value))) |
||
1835 | return FALSE; |
||
1836 | break; |
||
1837 | |||
1838 | case MIND: |
||
1839 | /* Multiple indirect symbols. This is OK if they both point |
||
1840 | to the same symbol. */ |
||
1841 | if (strcmp (h->u.i.link->root.string, string) == 0) |
||
1842 | break; |
||
1843 | /* Fall through. */ |
||
1844 | case MDEF: |
||
1845 | /* Handle a multiple definition. */ |
||
1846 | if (! ((*info->callbacks->multiple_definition) |
||
1847 | (info, h, abfd, section, value))) |
||
1848 | return FALSE; |
||
1849 | break; |
||
1850 | |||
1851 | case CIND: |
||
1852 | /* Create an indirect symbol from an existing common symbol. */ |
||
1853 | BFD_ASSERT (h->type == bfd_link_hash_common); |
||
1854 | if (! ((*info->callbacks->multiple_common) |
||
1855 | (info, h, abfd, bfd_link_hash_indirect, 0))) |
||
1856 | return FALSE; |
||
1857 | /* Fall through. */ |
||
1858 | case IND: |
||
1859 | /* Create an indirect symbol. */ |
||
1860 | { |
||
1861 | struct bfd_link_hash_entry *inh; |
||
1862 | |||
1863 | /* STRING is the name of the symbol we want to indirect |
||
1864 | to. */ |
||
1865 | inh = bfd_wrapped_link_hash_lookup (abfd, info, string, TRUE, |
||
1866 | copy, FALSE); |
||
1867 | if (inh == NULL) |
||
1868 | return FALSE; |
||
1869 | if (inh->type == bfd_link_hash_indirect |
||
1870 | && inh->u.i.link == h) |
||
1871 | { |
||
1872 | (*_bfd_error_handler) |
||
1873 | (_("%B: indirect symbol `%s' to `%s' is a loop"), |
||
1874 | abfd, name, string); |
||
1875 | bfd_set_error (bfd_error_invalid_operation); |
||
1876 | return FALSE; |
||
1877 | } |
||
1878 | if (inh->type == bfd_link_hash_new) |
||
1879 | { |
||
1880 | inh->type = bfd_link_hash_undefined; |
||
1881 | inh->u.undef.abfd = abfd; |
||
1882 | bfd_link_add_undef (info->hash, inh); |
||
1883 | } |
||
1884 | |||
1885 | /* If the indirect symbol has been referenced, we need to |
||
1886 | push the reference down to the symbol we are |
||
1887 | referencing. */ |
||
1888 | if (h->type != bfd_link_hash_new) |
||
1889 | { |
||
1890 | row = UNDEF_ROW; |
||
1891 | cycle = TRUE; |
||
1892 | } |
||
1893 | |||
1894 | h->type = bfd_link_hash_indirect; |
||
1895 | h->u.i.link = inh; |
||
1896 | } |
||
1897 | break; |
||
1898 | |||
1899 | case SET: |
||
1900 | /* Add an entry to a set. */ |
||
1901 | if (! (*info->callbacks->add_to_set) (info, h, BFD_RELOC_CTOR, |
||
1902 | abfd, section, value)) |
||
1903 | return FALSE; |
||
1904 | break; |
||
1905 | |||
1906 | case WARNC: |
||
1907 | /* Issue a warning and cycle. */ |
||
1908 | if (h->u.i.warning != NULL) |
||
1909 | { |
||
1910 | if (! (*info->callbacks->warning) (info, h->u.i.warning, |
||
1911 | h->root.string, abfd, |
||
1912 | NULL, 0)) |
||
1913 | return FALSE; |
||
1914 | /* Only issue a warning once. */ |
||
1915 | h->u.i.warning = NULL; |
||
1916 | } |
||
1917 | /* Fall through. */ |
||
1918 | case CYCLE: |
||
1919 | /* Try again with the referenced symbol. */ |
||
1920 | h = h->u.i.link; |
||
1921 | cycle = TRUE; |
||
1922 | break; |
||
1923 | |||
1924 | case REFC: |
||
1925 | /* A reference to an indirect symbol. */ |
||
1926 | if (h->u.undef.next == NULL && info->hash->undefs_tail != h) |
||
1927 | h->u.undef.next = h; |
||
1928 | h = h->u.i.link; |
||
1929 | cycle = TRUE; |
||
1930 | break; |
||
1931 | |||
1932 | case WARN: |
||
1933 | /* Issue a warning. */ |
||
1934 | if (! (*info->callbacks->warning) (info, string, h->root.string, |
||
1935 | hash_entry_bfd (h), NULL, 0)) |
||
1936 | return FALSE; |
||
1937 | break; |
||
1938 | |||
1939 | case CWARN: |
||
1940 | /* Warn if this symbol has been referenced already, |
||
1941 | otherwise add a warning. A symbol has been referenced if |
||
1942 | the u.undef.next field is not NULL, or it is the tail of the |
||
1943 | undefined symbol list. The REF case above helps to |
||
1944 | ensure this. */ |
||
1945 | if (h->u.undef.next != NULL || info->hash->undefs_tail == h) |
||
1946 | { |
||
1947 | if (! (*info->callbacks->warning) (info, string, h->root.string, |
||
1948 | hash_entry_bfd (h), NULL, 0)) |
||
1949 | return FALSE; |
||
1950 | break; |
||
1951 | } |
||
1952 | /* Fall through. */ |
||
1953 | case MWARN: |
||
1954 | /* Make a warning symbol. */ |
||
1955 | { |
||
1956 | struct bfd_link_hash_entry *sub; |
||
1957 | |||
1958 | /* STRING is the warning to give. */ |
||
1959 | sub = ((struct bfd_link_hash_entry *) |
||
1960 | ((*info->hash->table.newfunc) |
||
1961 | (NULL, &info->hash->table, h->root.string))); |
||
1962 | if (sub == NULL) |
||
1963 | return FALSE; |
||
1964 | *sub = *h; |
||
1965 | sub->type = bfd_link_hash_warning; |
||
1966 | sub->u.i.link = h; |
||
1967 | if (! copy) |
||
1968 | sub->u.i.warning = string; |
||
1969 | else |
||
1970 | { |
||
1971 | char *w; |
||
1972 | size_t len = strlen (string) + 1; |
||
1973 | |||
1974 | w = (char *) bfd_hash_allocate (&info->hash->table, len); |
||
1975 | if (w == NULL) |
||
1976 | return FALSE; |
||
1977 | memcpy (w, string, len); |
||
1978 | sub->u.i.warning = w; |
||
1979 | } |
||
1980 | |||
1981 | bfd_hash_replace (&info->hash->table, |
||
1982 | (struct bfd_hash_entry *) h, |
||
1983 | (struct bfd_hash_entry *) sub); |
||
1984 | if (hashp != NULL) |
||
1985 | *hashp = sub; |
||
1986 | } |
||
1987 | break; |
||
1988 | } |
||
1989 | } |
||
1990 | while (cycle); |
||
1991 | |||
1992 | return TRUE; |
||
1993 | } |
||
1994 | |||
1995 | /* Generic final link routine. */ |
||
1996 | |||
1997 | bfd_boolean |
||
1998 | _bfd_generic_final_link (bfd *abfd, struct bfd_link_info *info) |
||
1999 | { |
||
2000 | bfd *sub; |
||
2001 | asection *o; |
||
2002 | struct bfd_link_order *p; |
||
2003 | size_t outsymalloc; |
||
2004 | struct generic_write_global_symbol_info wginfo; |
||
2005 | |||
2006 | bfd_get_outsymbols (abfd) = NULL; |
||
2007 | bfd_get_symcount (abfd) = 0; |
||
2008 | outsymalloc = 0; |
||
2009 | |||
2010 | /* Mark all sections which will be included in the output file. */ |
||
2011 | for (o = abfd->sections; o != NULL; o = o->next) |
||
2012 | for (p = o->map_head.link_order; p != NULL; p = p->next) |
||
2013 | if (p->type == bfd_indirect_link_order) |
||
2014 | p->u.indirect.section->linker_mark = TRUE; |
||
2015 | |||
2016 | /* Build the output symbol table. */ |
||
2017 | for (sub = info->input_bfds; sub != NULL; sub = sub->link_next) |
||
2018 | if (! _bfd_generic_link_output_symbols (abfd, sub, info, &outsymalloc)) |
||
2019 | return FALSE; |
||
2020 | |||
2021 | /* Accumulate the global symbols. */ |
||
2022 | wginfo.info = info; |
||
2023 | wginfo.output_bfd = abfd; |
||
2024 | wginfo.psymalloc = &outsymalloc; |
||
2025 | _bfd_generic_link_hash_traverse (_bfd_generic_hash_table (info), |
||
2026 | _bfd_generic_link_write_global_symbol, |
||
2027 | &wginfo); |
||
2028 | |||
2029 | /* Make sure we have a trailing NULL pointer on OUTSYMBOLS. We |
||
2030 | shouldn't really need one, since we have SYMCOUNT, but some old |
||
2031 | code still expects one. */ |
||
2032 | if (! generic_add_output_symbol (abfd, &outsymalloc, NULL)) |
||
2033 | return FALSE; |
||
2034 | |||
2035 | if (info->relocatable) |
||
2036 | { |
||
2037 | /* Allocate space for the output relocs for each section. */ |
||
2038 | for (o = abfd->sections; o != NULL; o = o->next) |
||
2039 | { |
||
2040 | o->reloc_count = 0; |
||
2041 | for (p = o->map_head.link_order; p != NULL; p = p->next) |
||
2042 | { |
||
2043 | if (p->type == bfd_section_reloc_link_order |
||
2044 | || p->type == bfd_symbol_reloc_link_order) |
||
2045 | ++o->reloc_count; |
||
2046 | else if (p->type == bfd_indirect_link_order) |
||
2047 | { |
||
2048 | asection *input_section; |
||
2049 | bfd *input_bfd; |
||
2050 | long relsize; |
||
2051 | arelent **relocs; |
||
2052 | asymbol **symbols; |
||
2053 | long reloc_count; |
||
2054 | |||
2055 | input_section = p->u.indirect.section; |
||
2056 | input_bfd = input_section->owner; |
||
2057 | relsize = bfd_get_reloc_upper_bound (input_bfd, |
||
2058 | input_section); |
||
2059 | if (relsize < 0) |
||
2060 | return FALSE; |
||
2061 | relocs = (arelent **) bfd_malloc (relsize); |
||
2062 | if (!relocs && relsize != 0) |
||
2063 | return FALSE; |
||
2064 | symbols = _bfd_generic_link_get_symbols (input_bfd); |
||
2065 | reloc_count = bfd_canonicalize_reloc (input_bfd, |
||
2066 | input_section, |
||
2067 | relocs, |
||
2068 | symbols); |
||
2069 | free (relocs); |
||
2070 | if (reloc_count < 0) |
||
2071 | return FALSE; |
||
2072 | BFD_ASSERT ((unsigned long) reloc_count |
||
2073 | == input_section->reloc_count); |
||
2074 | o->reloc_count += reloc_count; |
||
2075 | } |
||
2076 | } |
||
2077 | if (o->reloc_count > 0) |
||
2078 | { |
||
2079 | bfd_size_type amt; |
||
2080 | |||
2081 | amt = o->reloc_count; |
||
2082 | amt *= sizeof (arelent *); |
||
2083 | o->orelocation = (struct reloc_cache_entry **) bfd_alloc (abfd, amt); |
||
2084 | if (!o->orelocation) |
||
2085 | return FALSE; |
||
2086 | o->flags |= SEC_RELOC; |
||
2087 | /* Reset the count so that it can be used as an index |
||
2088 | when putting in the output relocs. */ |
||
2089 | o->reloc_count = 0; |
||
2090 | } |
||
2091 | } |
||
2092 | } |
||
2093 | |||
2094 | /* Handle all the link order information for the sections. */ |
||
2095 | for (o = abfd->sections; o != NULL; o = o->next) |
||
2096 | { |
||
2097 | for (p = o->map_head.link_order; p != NULL; p = p->next) |
||
2098 | { |
||
2099 | switch (p->type) |
||
2100 | { |
||
2101 | case bfd_section_reloc_link_order: |
||
2102 | case bfd_symbol_reloc_link_order: |
||
2103 | if (! _bfd_generic_reloc_link_order (abfd, info, o, p)) |
||
2104 | return FALSE; |
||
2105 | break; |
||
2106 | case bfd_indirect_link_order: |
||
2107 | if (! default_indirect_link_order (abfd, info, o, p, TRUE)) |
||
2108 | return FALSE; |
||
2109 | break; |
||
2110 | default: |
||
2111 | if (! _bfd_default_link_order (abfd, info, o, p)) |
||
2112 | return FALSE; |
||
2113 | break; |
||
2114 | } |
||
2115 | } |
||
2116 | } |
||
2117 | |||
2118 | return TRUE; |
||
2119 | } |
||
2120 | |||
2121 | /* Add an output symbol to the output BFD. */ |
||
2122 | |||
2123 | static bfd_boolean |
||
2124 | generic_add_output_symbol (bfd *output_bfd, size_t *psymalloc, asymbol *sym) |
||
2125 | { |
||
2126 | if (bfd_get_symcount (output_bfd) >= *psymalloc) |
||
2127 | { |
||
2128 | asymbol **newsyms; |
||
2129 | bfd_size_type amt; |
||
2130 | |||
2131 | if (*psymalloc == 0) |
||
2132 | *psymalloc = 124; |
||
2133 | else |
||
2134 | *psymalloc *= 2; |
||
2135 | amt = *psymalloc; |
||
2136 | amt *= sizeof (asymbol *); |
||
2137 | newsyms = (asymbol **) bfd_realloc (bfd_get_outsymbols (output_bfd), amt); |
||
2138 | if (newsyms == NULL) |
||
2139 | return FALSE; |
||
2140 | bfd_get_outsymbols (output_bfd) = newsyms; |
||
2141 | } |
||
2142 | |||
2143 | bfd_get_outsymbols (output_bfd) [bfd_get_symcount (output_bfd)] = sym; |
||
2144 | if (sym != NULL) |
||
2145 | ++ bfd_get_symcount (output_bfd); |
||
2146 | |||
2147 | return TRUE; |
||
2148 | } |
||
2149 | |||
2150 | /* Handle the symbols for an input BFD. */ |
||
2151 | |||
2152 | bfd_boolean |
||
2153 | _bfd_generic_link_output_symbols (bfd *output_bfd, |
||
2154 | bfd *input_bfd, |
||
2155 | struct bfd_link_info *info, |
||
2156 | size_t *psymalloc) |
||
2157 | { |
||
2158 | asymbol **sym_ptr; |
||
2159 | asymbol **sym_end; |
||
2160 | |||
2161 | if (!bfd_generic_link_read_symbols (input_bfd)) |
||
2162 | return FALSE; |
||
2163 | |||
2164 | /* Create a filename symbol if we are supposed to. */ |
||
2165 | if (info->create_object_symbols_section != NULL) |
||
2166 | { |
||
2167 | asection *sec; |
||
2168 | |||
2169 | for (sec = input_bfd->sections; sec != NULL; sec = sec->next) |
||
2170 | { |
||
2171 | if (sec->output_section == info->create_object_symbols_section) |
||
2172 | { |
||
2173 | asymbol *newsym; |
||
2174 | |||
2175 | newsym = bfd_make_empty_symbol (input_bfd); |
||
2176 | if (!newsym) |
||
2177 | return FALSE; |
||
2178 | newsym->name = input_bfd->filename; |
||
2179 | newsym->value = 0; |
||
2180 | newsym->flags = BSF_LOCAL | BSF_FILE; |
||
2181 | newsym->section = sec; |
||
2182 | |||
2183 | if (! generic_add_output_symbol (output_bfd, psymalloc, |
||
2184 | newsym)) |
||
2185 | return FALSE; |
||
2186 | |||
2187 | break; |
||
2188 | } |
||
2189 | } |
||
2190 | } |
||
2191 | |||
2192 | /* Adjust the values of the globally visible symbols, and write out |
||
2193 | local symbols. */ |
||
2194 | sym_ptr = _bfd_generic_link_get_symbols (input_bfd); |
||
2195 | sym_end = sym_ptr + _bfd_generic_link_get_symcount (input_bfd); |
||
2196 | for (; sym_ptr < sym_end; sym_ptr++) |
||
2197 | { |
||
2198 | asymbol *sym; |
||
2199 | struct generic_link_hash_entry *h; |
||
2200 | bfd_boolean output; |
||
2201 | |||
2202 | h = NULL; |
||
2203 | sym = *sym_ptr; |
||
2204 | if ((sym->flags & (BSF_INDIRECT |
||
2205 | | BSF_WARNING |
||
2206 | | BSF_GLOBAL |
||
2207 | | BSF_CONSTRUCTOR |
||
2208 | | BSF_WEAK)) != 0 |
||
2209 | || bfd_is_und_section (bfd_get_section (sym)) |
||
2210 | || bfd_is_com_section (bfd_get_section (sym)) |
||
2211 | || bfd_is_ind_section (bfd_get_section (sym))) |
||
2212 | { |
||
2213 | if (sym->udata.p != NULL) |
||
2214 | h = (struct generic_link_hash_entry *) sym->udata.p; |
||
2215 | else if ((sym->flags & BSF_CONSTRUCTOR) != 0) |
||
2216 | { |
||
2217 | /* This case normally means that the main linker code |
||
2218 | deliberately ignored this constructor symbol. We |
||
2219 | should just pass it through. This will screw up if |
||
2220 | the constructor symbol is from a different, |
||
2221 | non-generic, object file format, but the case will |
||
2222 | only arise when linking with -r, which will probably |
||
2223 | fail anyhow, since there will be no way to represent |
||
2224 | the relocs in the output format being used. */ |
||
2225 | h = NULL; |
||
2226 | } |
||
2227 | else if (bfd_is_und_section (bfd_get_section (sym))) |
||
2228 | h = ((struct generic_link_hash_entry *) |
||
2229 | bfd_wrapped_link_hash_lookup (output_bfd, info, |
||
2230 | bfd_asymbol_name (sym), |
||
2231 | FALSE, FALSE, TRUE)); |
||
2232 | else |
||
2233 | h = _bfd_generic_link_hash_lookup (_bfd_generic_hash_table (info), |
||
2234 | bfd_asymbol_name (sym), |
||
2235 | FALSE, FALSE, TRUE); |
||
2236 | |||
2237 | if (h != NULL) |
||
2238 | { |
||
2239 | /* Force all references to this symbol to point to |
||
2240 | the same area in memory. It is possible that |
||
2241 | this routine will be called with a hash table |
||
2242 | other than a generic hash table, so we double |
||
2243 | check that. */ |
||
2244 | if (info->output_bfd->xvec == input_bfd->xvec) |
||
2245 | { |
||
2246 | if (h->sym != NULL) |
||
2247 | *sym_ptr = sym = h->sym; |
||
2248 | } |
||
2249 | |||
2250 | switch (h->root.type) |
||
2251 | { |
||
2252 | default: |
||
2253 | case bfd_link_hash_new: |
||
2254 | abort (); |
||
2255 | case bfd_link_hash_undefined: |
||
2256 | break; |
||
2257 | case bfd_link_hash_undefweak: |
||
2258 | sym->flags |= BSF_WEAK; |
||
2259 | break; |
||
2260 | case bfd_link_hash_indirect: |
||
2261 | h = (struct generic_link_hash_entry *) h->root.u.i.link; |
||
2262 | /* fall through */ |
||
2263 | case bfd_link_hash_defined: |
||
2264 | sym->flags |= BSF_GLOBAL; |
||
2265 | sym->flags &=~ BSF_CONSTRUCTOR; |
||
2266 | sym->value = h->root.u.def.value; |
||
2267 | sym->section = h->root.u.def.section; |
||
2268 | break; |
||
2269 | case bfd_link_hash_defweak: |
||
2270 | sym->flags |= BSF_WEAK; |
||
2271 | sym->flags &=~ BSF_CONSTRUCTOR; |
||
2272 | sym->value = h->root.u.def.value; |
||
2273 | sym->section = h->root.u.def.section; |
||
2274 | break; |
||
2275 | case bfd_link_hash_common: |
||
2276 | sym->value = h->root.u.c.size; |
||
2277 | sym->flags |= BSF_GLOBAL; |
||
2278 | if (! bfd_is_com_section (sym->section)) |
||
2279 | { |
||
2280 | BFD_ASSERT (bfd_is_und_section (sym->section)); |
||
2281 | sym->section = bfd_com_section_ptr; |
||
2282 | } |
||
2283 | /* We do not set the section of the symbol to |
||
2284 | h->root.u.c.p->section. That value was saved so |
||
2285 | that we would know where to allocate the symbol |
||
2286 | if it was defined. In this case the type is |
||
2287 | still bfd_link_hash_common, so we did not define |
||
2288 | it, so we do not want to use that section. */ |
||
2289 | break; |
||
2290 | } |
||
2291 | } |
||
2292 | } |
||
2293 | |||
2294 | /* This switch is straight from the old code in |
||
2295 | write_file_locals in ldsym.c. */ |
||
2296 | if (info->strip == strip_all |
||
2297 | || (info->strip == strip_some |
||
2298 | && bfd_hash_lookup (info->keep_hash, bfd_asymbol_name (sym), |
||
2299 | FALSE, FALSE) == NULL)) |
||
2300 | output = FALSE; |
||
2301 | else if ((sym->flags & (BSF_GLOBAL | BSF_WEAK)) != 0) |
||
2302 | { |
||
2303 | /* If this symbol is marked as occurring now, rather |
||
2304 | than at the end, output it now. This is used for |
||
2305 | COFF C_EXT FCN symbols. FIXME: There must be a |
||
2306 | better way. */ |
||
2307 | if (bfd_asymbol_bfd (sym) == input_bfd |
||
2308 | && (sym->flags & BSF_NOT_AT_END) != 0) |
||
2309 | output = TRUE; |
||
2310 | else |
||
2311 | output = FALSE; |
||
2312 | } |
||
2313 | else if (bfd_is_ind_section (sym->section)) |
||
2314 | output = FALSE; |
||
2315 | else if ((sym->flags & BSF_DEBUGGING) != 0) |
||
2316 | { |
||
2317 | if (info->strip == strip_none) |
||
2318 | output = TRUE; |
||
2319 | else |
||
2320 | output = FALSE; |
||
2321 | } |
||
2322 | else if (bfd_is_und_section (sym->section) |
||
2323 | || bfd_is_com_section (sym->section)) |
||
2324 | output = FALSE; |
||
2325 | else if ((sym->flags & BSF_LOCAL) != 0) |
||
2326 | { |
||
2327 | if ((sym->flags & BSF_WARNING) != 0) |
||
2328 | output = FALSE; |
||
2329 | else |
||
2330 | { |
||
2331 | switch (info->discard) |
||
2332 | { |
||
2333 | default: |
||
2334 | case discard_all: |
||
2335 | output = FALSE; |
||
2336 | break; |
||
2337 | case discard_sec_merge: |
||
2338 | output = TRUE; |
||
2339 | if (info->relocatable |
||
2340 | || ! (sym->section->flags & SEC_MERGE)) |
||
2341 | break; |
||
2342 | /* FALLTHROUGH */ |
||
2343 | case discard_l: |
||
2344 | if (bfd_is_local_label (input_bfd, sym)) |
||
2345 | output = FALSE; |
||
2346 | else |
||
2347 | output = TRUE; |
||
2348 | break; |
||
2349 | case discard_none: |
||
2350 | output = TRUE; |
||
2351 | break; |
||
2352 | } |
||
2353 | } |
||
2354 | } |
||
2355 | else if ((sym->flags & BSF_CONSTRUCTOR)) |
||
2356 | { |
||
2357 | if (info->strip != strip_all) |
||
2358 | output = TRUE; |
||
2359 | else |
||
2360 | output = FALSE; |
||
2361 | } |
||
2362 | else if (sym->flags == 0 |
||
2363 | && (sym->section->owner->flags & BFD_PLUGIN) != 0) |
||
2364 | /* LTO doesn't set symbol information. We get here with the |
||
2365 | generic linker for a symbol that was "common" but no longer |
||
2366 | needs to be global. */ |
||
2367 | output = FALSE; |
||
2368 | else |
||
2369 | abort (); |
||
2370 | |||
2371 | /* If this symbol is in a section which is not being included |
||
2372 | in the output file, then we don't want to output the |
||
2373 | symbol. */ |
||
2374 | if (!bfd_is_abs_section (sym->section) |
||
2375 | && bfd_section_removed_from_list (output_bfd, |
||
2376 | sym->section->output_section)) |
||
2377 | output = FALSE; |
||
2378 | |||
2379 | if (output) |
||
2380 | { |
||
2381 | if (! generic_add_output_symbol (output_bfd, psymalloc, sym)) |
||
2382 | return FALSE; |
||
2383 | if (h != NULL) |
||
2384 | h->written = TRUE; |
||
2385 | } |
||
2386 | } |
||
2387 | |||
2388 | return TRUE; |
||
2389 | } |
||
2390 | |||
2391 | /* Set the section and value of a generic BFD symbol based on a linker |
||
2392 | hash table entry. */ |
||
2393 | |||
2394 | static void |
||
2395 | set_symbol_from_hash (asymbol *sym, struct bfd_link_hash_entry *h) |
||
2396 | { |
||
2397 | switch (h->type) |
||
2398 | { |
||
2399 | default: |
||
2400 | abort (); |
||
2401 | break; |
||
2402 | case bfd_link_hash_new: |
||
2403 | /* This can happen when a constructor symbol is seen but we are |
||
2404 | not building constructors. */ |
||
2405 | if (sym->section != NULL) |
||
2406 | { |
||
2407 | BFD_ASSERT ((sym->flags & BSF_CONSTRUCTOR) != 0); |
||
2408 | } |
||
2409 | else |
||
2410 | { |
||
2411 | sym->flags |= BSF_CONSTRUCTOR; |
||
2412 | sym->section = bfd_abs_section_ptr; |
||
2413 | sym->value = 0; |
||
2414 | } |
||
2415 | break; |
||
2416 | case bfd_link_hash_undefined: |
||
2417 | sym->section = bfd_und_section_ptr; |
||
2418 | sym->value = 0; |
||
2419 | break; |
||
2420 | case bfd_link_hash_undefweak: |
||
2421 | sym->section = bfd_und_section_ptr; |
||
2422 | sym->value = 0; |
||
2423 | sym->flags |= BSF_WEAK; |
||
2424 | break; |
||
2425 | case bfd_link_hash_defined: |
||
2426 | sym->section = h->u.def.section; |
||
2427 | sym->value = h->u.def.value; |
||
2428 | break; |
||
2429 | case bfd_link_hash_defweak: |
||
2430 | sym->flags |= BSF_WEAK; |
||
2431 | sym->section = h->u.def.section; |
||
2432 | sym->value = h->u.def.value; |
||
2433 | break; |
||
2434 | case bfd_link_hash_common: |
||
2435 | sym->value = h->u.c.size; |
||
2436 | if (sym->section == NULL) |
||
2437 | sym->section = bfd_com_section_ptr; |
||
2438 | else if (! bfd_is_com_section (sym->section)) |
||
2439 | { |
||
2440 | BFD_ASSERT (bfd_is_und_section (sym->section)); |
||
2441 | sym->section = bfd_com_section_ptr; |
||
2442 | } |
||
2443 | /* Do not set the section; see _bfd_generic_link_output_symbols. */ |
||
2444 | break; |
||
2445 | case bfd_link_hash_indirect: |
||
2446 | case bfd_link_hash_warning: |
||
2447 | /* FIXME: What should we do here? */ |
||
2448 | break; |
||
2449 | } |
||
2450 | } |
||
2451 | |||
2452 | /* Write out a global symbol, if it hasn't already been written out. |
||
2453 | This is called for each symbol in the hash table. */ |
||
2454 | |||
2455 | bfd_boolean |
||
2456 | _bfd_generic_link_write_global_symbol (struct generic_link_hash_entry *h, |
||
2457 | void *data) |
||
2458 | { |
||
2459 | struct generic_write_global_symbol_info *wginfo = |
||
2460 | (struct generic_write_global_symbol_info *) data; |
||
2461 | asymbol *sym; |
||
2462 | |||
2463 | if (h->written) |
||
2464 | return TRUE; |
||
2465 | |||
2466 | h->written = TRUE; |
||
2467 | |||
2468 | if (wginfo->info->strip == strip_all |
||
2469 | || (wginfo->info->strip == strip_some |
||
2470 | && bfd_hash_lookup (wginfo->info->keep_hash, h->root.root.string, |
||
2471 | FALSE, FALSE) == NULL)) |
||
2472 | return TRUE; |
||
2473 | |||
2474 | if (h->sym != NULL) |
||
2475 | sym = h->sym; |
||
2476 | else |
||
2477 | { |
||
2478 | sym = bfd_make_empty_symbol (wginfo->output_bfd); |
||
2479 | if (!sym) |
||
2480 | return FALSE; |
||
2481 | sym->name = h->root.root.string; |
||
2482 | sym->flags = 0; |
||
2483 | } |
||
2484 | |||
2485 | set_symbol_from_hash (sym, &h->root); |
||
2486 | |||
2487 | sym->flags |= BSF_GLOBAL; |
||
2488 | |||
2489 | if (! generic_add_output_symbol (wginfo->output_bfd, wginfo->psymalloc, |
||
2490 | sym)) |
||
2491 | { |
||
2492 | /* FIXME: No way to return failure. */ |
||
2493 | abort (); |
||
2494 | } |
||
2495 | |||
2496 | return TRUE; |
||
2497 | } |
||
2498 | |||
2499 | /* Create a relocation. */ |
||
2500 | |||
2501 | bfd_boolean |
||
2502 | _bfd_generic_reloc_link_order (bfd *abfd, |
||
2503 | struct bfd_link_info *info, |
||
2504 | asection *sec, |
||
2505 | struct bfd_link_order *link_order) |
||
2506 | { |
||
2507 | arelent *r; |
||
2508 | |||
2509 | if (! info->relocatable) |
||
2510 | abort (); |
||
2511 | if (sec->orelocation == NULL) |
||
2512 | abort (); |
||
2513 | |||
2514 | r = (arelent *) bfd_alloc (abfd, sizeof (arelent)); |
||
2515 | if (r == NULL) |
||
2516 | return FALSE; |
||
2517 | |||
2518 | r->address = link_order->offset; |
||
2519 | r->howto = bfd_reloc_type_lookup (abfd, link_order->u.reloc.p->reloc); |
||
2520 | if (r->howto == 0) |
||
2521 | { |
||
2522 | bfd_set_error (bfd_error_bad_value); |
||
2523 | return FALSE; |
||
2524 | } |
||
2525 | |||
2526 | /* Get the symbol to use for the relocation. */ |
||
2527 | if (link_order->type == bfd_section_reloc_link_order) |
||
2528 | r->sym_ptr_ptr = link_order->u.reloc.p->u.section->symbol_ptr_ptr; |
||
2529 | else |
||
2530 | { |
||
2531 | struct generic_link_hash_entry *h; |
||
2532 | |||
2533 | h = ((struct generic_link_hash_entry *) |
||
2534 | bfd_wrapped_link_hash_lookup (abfd, info, |
||
2535 | link_order->u.reloc.p->u.name, |
||
2536 | FALSE, FALSE, TRUE)); |
||
2537 | if (h == NULL |
||
2538 | || ! h->written) |
||
2539 | { |
||
2540 | if (! ((*info->callbacks->unattached_reloc) |
||
2541 | (info, link_order->u.reloc.p->u.name, NULL, NULL, 0))) |
||
2542 | return FALSE; |
||
2543 | bfd_set_error (bfd_error_bad_value); |
||
2544 | return FALSE; |
||
2545 | } |
||
2546 | r->sym_ptr_ptr = &h->sym; |
||
2547 | } |
||
2548 | |||
2549 | /* If this is an inplace reloc, write the addend to the object file. |
||
2550 | Otherwise, store it in the reloc addend. */ |
||
2551 | if (! r->howto->partial_inplace) |
||
2552 | r->addend = link_order->u.reloc.p->addend; |
||
2553 | else |
||
2554 | { |
||
2555 | bfd_size_type size; |
||
2556 | bfd_reloc_status_type rstat; |
||
2557 | bfd_byte *buf; |
||
2558 | bfd_boolean ok; |
||
2559 | file_ptr loc; |
||
2560 | |||
2561 | size = bfd_get_reloc_size (r->howto); |
||
2562 | buf = (bfd_byte *) bfd_zmalloc (size); |
||
2563 | if (buf == NULL) |
||
2564 | return FALSE; |
||
2565 | rstat = _bfd_relocate_contents (r->howto, abfd, |
||
2566 | (bfd_vma) link_order->u.reloc.p->addend, |
||
2567 | buf); |
||
2568 | switch (rstat) |
||
2569 | { |
||
2570 | case bfd_reloc_ok: |
||
2571 | break; |
||
2572 | default: |
||
2573 | case bfd_reloc_outofrange: |
||
2574 | abort (); |
||
2575 | case bfd_reloc_overflow: |
||
2576 | if (! ((*info->callbacks->reloc_overflow) |
||
2577 | (info, NULL, |
||
2578 | (link_order->type == bfd_section_reloc_link_order |
||
2579 | ? bfd_section_name (abfd, link_order->u.reloc.p->u.section) |
||
2580 | : link_order->u.reloc.p->u.name), |
||
2581 | r->howto->name, link_order->u.reloc.p->addend, |
||
2582 | NULL, NULL, 0))) |
||
2583 | { |
||
2584 | free (buf); |
||
2585 | return FALSE; |
||
2586 | } |
||
2587 | break; |
||
2588 | } |
||
2589 | loc = link_order->offset * bfd_octets_per_byte (abfd); |
||
2590 | ok = bfd_set_section_contents (abfd, sec, buf, loc, size); |
||
2591 | free (buf); |
||
2592 | if (! ok) |
||
2593 | return FALSE; |
||
2594 | |||
2595 | r->addend = 0; |
||
2596 | } |
||
2597 | |||
2598 | sec->orelocation[sec->reloc_count] = r; |
||
2599 | ++sec->reloc_count; |
||
2600 | |||
2601 | return TRUE; |
||
2602 | } |
||
2603 | |||
2604 | /* Allocate a new link_order for a section. */ |
||
2605 | |||
2606 | struct bfd_link_order * |
||
2607 | bfd_new_link_order (bfd *abfd, asection *section) |
||
2608 | { |
||
2609 | bfd_size_type amt = sizeof (struct bfd_link_order); |
||
2610 | struct bfd_link_order *new_lo; |
||
2611 | |||
2612 | new_lo = (struct bfd_link_order *) bfd_zalloc (abfd, amt); |
||
2613 | if (!new_lo) |
||
2614 | return NULL; |
||
2615 | |||
2616 | new_lo->type = bfd_undefined_link_order; |
||
2617 | |||
2618 | if (section->map_tail.link_order != NULL) |
||
2619 | section->map_tail.link_order->next = new_lo; |
||
2620 | else |
||
2621 | section->map_head.link_order = new_lo; |
||
2622 | section->map_tail.link_order = new_lo; |
||
2623 | |||
2624 | return new_lo; |
||
2625 | } |
||
2626 | |||
2627 | /* Default link order processing routine. Note that we can not handle |
||
2628 | the reloc_link_order types here, since they depend upon the details |
||
2629 | of how the particular backends generates relocs. */ |
||
2630 | |||
2631 | bfd_boolean |
||
2632 | _bfd_default_link_order (bfd *abfd, |
||
2633 | struct bfd_link_info *info, |
||
2634 | asection *sec, |
||
2635 | struct bfd_link_order *link_order) |
||
2636 | { |
||
2637 | switch (link_order->type) |
||
2638 | { |
||
2639 | case bfd_undefined_link_order: |
||
2640 | case bfd_section_reloc_link_order: |
||
2641 | case bfd_symbol_reloc_link_order: |
||
2642 | default: |
||
2643 | abort (); |
||
2644 | case bfd_indirect_link_order: |
||
2645 | return default_indirect_link_order (abfd, info, sec, link_order, |
||
2646 | FALSE); |
||
2647 | case bfd_data_link_order: |
||
2648 | return default_data_link_order (abfd, info, sec, link_order); |
||
2649 | } |
||
2650 | } |
||
2651 | |||
2652 | /* Default routine to handle a bfd_data_link_order. */ |
||
2653 | |||
2654 | static bfd_boolean |
||
2655 | default_data_link_order (bfd *abfd, |
||
2656 | struct bfd_link_info *info ATTRIBUTE_UNUSED, |
||
2657 | asection *sec, |
||
2658 | struct bfd_link_order *link_order) |
||
2659 | { |
||
2660 | bfd_size_type size; |
||
2661 | size_t fill_size; |
||
2662 | bfd_byte *fill; |
||
2663 | file_ptr loc; |
||
2664 | bfd_boolean result; |
||
2665 | |||
2666 | BFD_ASSERT ((sec->flags & SEC_HAS_CONTENTS) != 0); |
||
2667 | |||
2668 | size = link_order->size; |
||
2669 | if (size == 0) |
||
2670 | return TRUE; |
||
2671 | |||
2672 | fill = link_order->u.data.contents; |
||
2673 | fill_size = link_order->u.data.size; |
||
2674 | if (fill_size == 0) |
||
2675 | { |
||
2676 | fill = abfd->arch_info->fill (size, bfd_big_endian (abfd), |
||
2677 | (sec->flags & SEC_CODE) != 0); |
||
2678 | if (fill == NULL) |
||
2679 | return FALSE; |
||
2680 | } |
||
2681 | else if (fill_size < size) |
||
2682 | { |
||
2683 | bfd_byte *p; |
||
2684 | fill = (bfd_byte *) bfd_malloc (size); |
||
2685 | if (fill == NULL) |
||
2686 | return FALSE; |
||
2687 | p = fill; |
||
2688 | if (fill_size == 1) |
||
2689 | memset (p, (int) link_order->u.data.contents[0], (size_t) size); |
||
2690 | else |
||
2691 | { |
||
2692 | do |
||
2693 | { |
||
2694 | memcpy (p, link_order->u.data.contents, fill_size); |
||
2695 | p += fill_size; |
||
2696 | size -= fill_size; |
||
2697 | } |
||
2698 | while (size >= fill_size); |
||
2699 | if (size != 0) |
||
2700 | memcpy (p, link_order->u.data.contents, (size_t) size); |
||
2701 | size = link_order->size; |
||
2702 | } |
||
2703 | } |
||
2704 | |||
2705 | loc = link_order->offset * bfd_octets_per_byte (abfd); |
||
2706 | result = bfd_set_section_contents (abfd, sec, fill, loc, size); |
||
2707 | |||
2708 | if (fill != link_order->u.data.contents) |
||
2709 | free (fill); |
||
2710 | return result; |
||
2711 | } |
||
2712 | |||
2713 | /* Default routine to handle a bfd_indirect_link_order. */ |
||
2714 | |||
2715 | static bfd_boolean |
||
2716 | default_indirect_link_order (bfd *output_bfd, |
||
2717 | struct bfd_link_info *info, |
||
2718 | asection *output_section, |
||
2719 | struct bfd_link_order *link_order, |
||
2720 | bfd_boolean generic_linker) |
||
2721 | { |
||
2722 | asection *input_section; |
||
2723 | bfd *input_bfd; |
||
2724 | bfd_byte *contents = NULL; |
||
2725 | bfd_byte *new_contents; |
||
2726 | bfd_size_type sec_size; |
||
2727 | file_ptr loc; |
||
2728 | |||
2729 | BFD_ASSERT ((output_section->flags & SEC_HAS_CONTENTS) != 0); |
||
2730 | |||
2731 | input_section = link_order->u.indirect.section; |
||
2732 | input_bfd = input_section->owner; |
||
2733 | if (input_section->size == 0) |
||
2734 | return TRUE; |
||
2735 | |||
2736 | BFD_ASSERT (input_section->output_section == output_section); |
||
2737 | BFD_ASSERT (input_section->output_offset == link_order->offset); |
||
2738 | BFD_ASSERT (input_section->size == link_order->size); |
||
2739 | |||
2740 | if (info->relocatable |
||
2741 | && input_section->reloc_count > 0 |
||
2742 | && output_section->orelocation == NULL) |
||
2743 | { |
||
2744 | /* Space has not been allocated for the output relocations. |
||
2745 | This can happen when we are called by a specific backend |
||
2746 | because somebody is attempting to link together different |
||
2747 | types of object files. Handling this case correctly is |
||
2748 | difficult, and sometimes impossible. */ |
||
2749 | (*_bfd_error_handler) |
||
2750 | (_("Attempt to do relocatable link with %s input and %s output"), |
||
2751 | bfd_get_target (input_bfd), bfd_get_target (output_bfd)); |
||
2752 | bfd_set_error (bfd_error_wrong_format); |
||
2753 | return FALSE; |
||
2754 | } |
||
2755 | |||
2756 | if (! generic_linker) |
||
2757 | { |
||
2758 | asymbol **sympp; |
||
2759 | asymbol **symppend; |
||
2760 | |||
2761 | /* Get the canonical symbols. The generic linker will always |
||
2762 | have retrieved them by this point, but we are being called by |
||
2763 | a specific linker, presumably because we are linking |
||
2764 | different types of object files together. */ |
||
2765 | if (!bfd_generic_link_read_symbols (input_bfd)) |
||
2766 | return FALSE; |
||
2767 | |||
2768 | /* Since we have been called by a specific linker, rather than |
||
2769 | the generic linker, the values of the symbols will not be |
||
2770 | right. They will be the values as seen in the input file, |
||
2771 | not the values of the final link. We need to fix them up |
||
2772 | before we can relocate the section. */ |
||
2773 | sympp = _bfd_generic_link_get_symbols (input_bfd); |
||
2774 | symppend = sympp + _bfd_generic_link_get_symcount (input_bfd); |
||
2775 | for (; sympp < symppend; sympp++) |
||
2776 | { |
||
2777 | asymbol *sym; |
||
2778 | struct bfd_link_hash_entry *h; |
||
2779 | |||
2780 | sym = *sympp; |
||
2781 | |||
2782 | if ((sym->flags & (BSF_INDIRECT |
||
2783 | | BSF_WARNING |
||
2784 | | BSF_GLOBAL |
||
2785 | | BSF_CONSTRUCTOR |
||
2786 | | BSF_WEAK)) != 0 |
||
2787 | || bfd_is_und_section (bfd_get_section (sym)) |
||
2788 | || bfd_is_com_section (bfd_get_section (sym)) |
||
2789 | || bfd_is_ind_section (bfd_get_section (sym))) |
||
2790 | { |
||
2791 | /* sym->udata may have been set by |
||
2792 | generic_link_add_symbol_list. */ |
||
2793 | if (sym->udata.p != NULL) |
||
2794 | h = (struct bfd_link_hash_entry *) sym->udata.p; |
||
2795 | else if (bfd_is_und_section (bfd_get_section (sym))) |
||
2796 | h = bfd_wrapped_link_hash_lookup (output_bfd, info, |
||
2797 | bfd_asymbol_name (sym), |
||
2798 | FALSE, FALSE, TRUE); |
||
2799 | else |
||
2800 | h = bfd_link_hash_lookup (info->hash, |
||
2801 | bfd_asymbol_name (sym), |
||
2802 | FALSE, FALSE, TRUE); |
||
2803 | if (h != NULL) |
||
2804 | set_symbol_from_hash (sym, h); |
||
2805 | } |
||
2806 | } |
||
2807 | } |
||
2808 | |||
2809 | if ((output_section->flags & (SEC_GROUP | SEC_LINKER_CREATED)) == SEC_GROUP |
||
2810 | && input_section->size != 0) |
||
2811 | { |
||
2812 | /* Group section contents are set by bfd_elf_set_group_contents. */ |
||
2813 | if (!output_bfd->output_has_begun) |
||
2814 | { |
||
2815 | /* FIXME: This hack ensures bfd_elf_set_group_contents is called. */ |
||
2816 | if (!bfd_set_section_contents (output_bfd, output_section, "", 0, 1)) |
||
2817 | goto error_return; |
||
2818 | } |
||
2819 | new_contents = output_section->contents; |
||
2820 | BFD_ASSERT (new_contents != NULL); |
||
2821 | BFD_ASSERT (input_section->output_offset == 0); |
||
2822 | } |
||
2823 | else |
||
2824 | { |
||
2825 | /* Get and relocate the section contents. */ |
||
2826 | sec_size = (input_section->rawsize > input_section->size |
||
2827 | ? input_section->rawsize |
||
2828 | : input_section->size); |
||
2829 | contents = (bfd_byte *) bfd_malloc (sec_size); |
||
2830 | if (contents == NULL && sec_size != 0) |
||
2831 | goto error_return; |
||
2832 | new_contents = (bfd_get_relocated_section_contents |
||
2833 | (output_bfd, info, link_order, contents, |
||
2834 | info->relocatable, |
||
2835 | _bfd_generic_link_get_symbols (input_bfd))); |
||
2836 | if (!new_contents) |
||
2837 | goto error_return; |
||
2838 | } |
||
2839 | |||
2840 | /* Output the section contents. */ |
||
2841 | loc = input_section->output_offset * bfd_octets_per_byte (output_bfd); |
||
2842 | if (! bfd_set_section_contents (output_bfd, output_section, |
||
2843 | new_contents, loc, input_section->size)) |
||
2844 | goto error_return; |
||
2845 | |||
2846 | if (contents != NULL) |
||
2847 | free (contents); |
||
2848 | return TRUE; |
||
2849 | |||
2850 | error_return: |
||
2851 | if (contents != NULL) |
||
2852 | free (contents); |
||
2853 | return FALSE; |
||
2854 | } |
||
2855 | |||
2856 | /* A little routine to count the number of relocs in a link_order |
||
2857 | list. */ |
||
2858 | |||
2859 | unsigned int |
||
2860 | _bfd_count_link_order_relocs (struct bfd_link_order *link_order) |
||
2861 | { |
||
2862 | register unsigned int c; |
||
2863 | register struct bfd_link_order *l; |
||
2864 | |||
2865 | c = 0; |
||
2866 | for (l = link_order; l != NULL; l = l->next) |
||
2867 | { |
||
2868 | if (l->type == bfd_section_reloc_link_order |
||
2869 | || l->type == bfd_symbol_reloc_link_order) |
||
2870 | ++c; |
||
2871 | } |
||
2872 | |||
2873 | return c; |
||
2874 | } |
||
2875 | |||
2876 | /* |
||
2877 | FUNCTION |
||
2878 | bfd_link_split_section |
||
2879 | |||
2880 | SYNOPSIS |
||
2881 | bfd_boolean bfd_link_split_section (bfd *abfd, asection *sec); |
||
2882 | |||
2883 | DESCRIPTION |
||
2884 | Return nonzero if @var{sec} should be split during a |
||
2885 | reloceatable or final link. |
||
2886 | |||
2887 | .#define bfd_link_split_section(abfd, sec) \ |
||
2888 | . BFD_SEND (abfd, _bfd_link_split_section, (abfd, sec)) |
||
2889 | . |
||
2890 | |||
2891 | */ |
||
2892 | |||
2893 | bfd_boolean |
||
2894 | _bfd_generic_link_split_section (bfd *abfd ATTRIBUTE_UNUSED, |
||
2895 | asection *sec ATTRIBUTE_UNUSED) |
||
2896 | { |
||
2897 | return FALSE; |
||
2898 | } |
||
2899 | |||
2900 | /* |
||
2901 | FUNCTION |
||
2902 | bfd_section_already_linked |
||
2903 | |||
2904 | SYNOPSIS |
||
2905 | bfd_boolean bfd_section_already_linked (bfd *abfd, |
||
2906 | asection *sec, |
||
2907 | struct bfd_link_info *info); |
||
2908 | |||
2909 | DESCRIPTION |
||
2910 | Check if @var{data} has been already linked during a reloceatable |
||
2911 | or final link. Return TRUE if it has. |
||
2912 | |||
2913 | .#define bfd_section_already_linked(abfd, sec, info) \ |
||
2914 | . BFD_SEND (abfd, _section_already_linked, (abfd, sec, info)) |
||
2915 | . |
||
2916 | |||
2917 | */ |
||
2918 | |||
2919 | /* Sections marked with the SEC_LINK_ONCE flag should only be linked |
||
2920 | once into the output. This routine checks each section, and |
||
2921 | arrange to discard it if a section of the same name has already |
||
2922 | been linked. This code assumes that all relevant sections have the |
||
2923 | SEC_LINK_ONCE flag set; that is, it does not depend solely upon the |
||
2924 | section name. bfd_section_already_linked is called via |
||
2925 | bfd_map_over_sections. */ |
||
2926 | |||
2927 | /* The hash table. */ |
||
2928 | |||
2929 | static struct bfd_hash_table _bfd_section_already_linked_table; |
||
2930 | |||
2931 | /* Support routines for the hash table used by section_already_linked, |
||
2932 | initialize the table, traverse, lookup, fill in an entry and remove |
||
2933 | the table. */ |
||
2934 | |||
2935 | void |
||
2936 | bfd_section_already_linked_table_traverse |
||
2937 | (bfd_boolean (*func) (struct bfd_section_already_linked_hash_entry *, |
||
2938 | void *), void *info) |
||
2939 | { |
||
2940 | bfd_hash_traverse (&_bfd_section_already_linked_table, |
||
2941 | (bfd_boolean (*) (struct bfd_hash_entry *, |
||
2942 | void *)) func, |
||
2943 | info); |
||
2944 | } |
||
2945 | |||
2946 | struct bfd_section_already_linked_hash_entry * |
||
2947 | bfd_section_already_linked_table_lookup (const char *name) |
||
2948 | { |
||
2949 | return ((struct bfd_section_already_linked_hash_entry *) |
||
2950 | bfd_hash_lookup (&_bfd_section_already_linked_table, name, |
||
2951 | TRUE, FALSE)); |
||
2952 | } |
||
2953 | |||
2954 | bfd_boolean |
||
2955 | bfd_section_already_linked_table_insert |
||
2956 | (struct bfd_section_already_linked_hash_entry *already_linked_list, |
||
2957 | asection *sec) |
||
2958 | { |
||
2959 | struct bfd_section_already_linked *l; |
||
2960 | |||
2961 | /* Allocate the memory from the same obstack as the hash table is |
||
2962 | kept in. */ |
||
2963 | l = (struct bfd_section_already_linked *) |
||
2964 | bfd_hash_allocate (&_bfd_section_already_linked_table, sizeof *l); |
||
2965 | if (l == NULL) |
||
2966 | return FALSE; |
||
2967 | l->sec = sec; |
||
2968 | l->next = already_linked_list->entry; |
||
2969 | already_linked_list->entry = l; |
||
2970 | return TRUE; |
||
2971 | } |
||
2972 | |||
2973 | static struct bfd_hash_entry * |
||
2974 | already_linked_newfunc (struct bfd_hash_entry *entry ATTRIBUTE_UNUSED, |
||
2975 | struct bfd_hash_table *table, |
||
2976 | const char *string ATTRIBUTE_UNUSED) |
||
2977 | { |
||
2978 | struct bfd_section_already_linked_hash_entry *ret = |
||
2979 | (struct bfd_section_already_linked_hash_entry *) |
||
2980 | bfd_hash_allocate (table, sizeof *ret); |
||
2981 | |||
2982 | if (ret == NULL) |
||
2983 | return NULL; |
||
2984 | |||
2985 | ret->entry = NULL; |
||
2986 | |||
2987 | return &ret->root; |
||
2988 | } |
||
2989 | |||
2990 | bfd_boolean |
||
2991 | bfd_section_already_linked_table_init (void) |
||
2992 | { |
||
2993 | return bfd_hash_table_init_n (&_bfd_section_already_linked_table, |
||
2994 | already_linked_newfunc, |
||
2995 | sizeof (struct bfd_section_already_linked_hash_entry), |
||
2996 | 42); |
||
2997 | } |
||
2998 | |||
2999 | void |
||
3000 | bfd_section_already_linked_table_free (void) |
||
3001 | { |
||
3002 | bfd_hash_table_free (&_bfd_section_already_linked_table); |
||
3003 | } |
||
3004 | |||
3005 | /* Report warnings as appropriate for duplicate section SEC. |
||
3006 | Return FALSE if we decide to keep SEC after all. */ |
||
3007 | |||
3008 | bfd_boolean |
||
3009 | _bfd_handle_already_linked (asection *sec, |
||
3010 | struct bfd_section_already_linked *l, |
||
3011 | struct bfd_link_info *info) |
||
3012 | { |
||
3013 | switch (sec->flags & SEC_LINK_DUPLICATES) |
||
3014 | { |
||
3015 | default: |
||
3016 | abort (); |
||
3017 | |||
3018 | case SEC_LINK_DUPLICATES_DISCARD: |
||
3019 | /* If we found an LTO IR match for this comdat group on |
||
3020 | the first pass, replace it with the LTO output on the |
||
3021 | second pass. We can't simply choose real object |
||
3022 | files over IR because the first pass may contain a |
||
3023 | mix of LTO and normal objects and we must keep the |
||
3024 | first match, be it IR or real. */ |
||
3025 | if (info->loading_lto_outputs |
||
3026 | && (l->sec->owner->flags & BFD_PLUGIN) != 0) |
||
3027 | { |
||
3028 | l->sec = sec; |
||
3029 | return FALSE; |
||
3030 | } |
||
3031 | break; |
||
3032 | |||
3033 | case SEC_LINK_DUPLICATES_ONE_ONLY: |
||
3034 | info->callbacks->einfo |
||
3035 | (_("%B: ignoring duplicate section `%A'\n"), |
||
3036 | sec->owner, sec); |
||
3037 | break; |
||
3038 | |||
3039 | case SEC_LINK_DUPLICATES_SAME_SIZE: |
||
3040 | if ((l->sec->owner->flags & BFD_PLUGIN) != 0) |
||
3041 | ; |
||
3042 | else if (sec->size != l->sec->size) |
||
3043 | info->callbacks->einfo |
||
3044 | (_("%B: duplicate section `%A' has different size\n"), |
||
3045 | sec->owner, sec); |
||
3046 | break; |
||
3047 | |||
3048 | case SEC_LINK_DUPLICATES_SAME_CONTENTS: |
||
3049 | if ((l->sec->owner->flags & BFD_PLUGIN) != 0) |
||
3050 | ; |
||
3051 | else if (sec->size != l->sec->size) |
||
3052 | info->callbacks->einfo |
||
3053 | (_("%B: duplicate section `%A' has different size\n"), |
||
3054 | sec->owner, sec); |
||
3055 | else if (sec->size != 0) |
||
3056 | { |
||
3057 | bfd_byte *sec_contents, *l_sec_contents = NULL; |
||
3058 | |||
3059 | if (!bfd_malloc_and_get_section (sec->owner, sec, &sec_contents)) |
||
3060 | info->callbacks->einfo |
||
3061 | (_("%B: could not read contents of section `%A'\n"), |
||
3062 | sec->owner, sec); |
||
3063 | else if (!bfd_malloc_and_get_section (l->sec->owner, l->sec, |
||
3064 | &l_sec_contents)) |
||
3065 | info->callbacks->einfo |
||
3066 | (_("%B: could not read contents of section `%A'\n"), |
||
3067 | l->sec->owner, l->sec); |
||
3068 | else if (memcmp (sec_contents, l_sec_contents, sec->size) != 0) |
||
3069 | info->callbacks->einfo |
||
3070 | (_("%B: duplicate section `%A' has different contents\n"), |
||
3071 | sec->owner, sec); |
||
3072 | |||
3073 | if (sec_contents) |
||
3074 | free (sec_contents); |
||
3075 | if (l_sec_contents) |
||
3076 | free (l_sec_contents); |
||
3077 | } |
||
3078 | break; |
||
3079 | } |
||
3080 | |||
3081 | /* Set the output_section field so that lang_add_section |
||
3082 | does not create a lang_input_section structure for this |
||
3083 | section. Since there might be a symbol in the section |
||
3084 | being discarded, we must retain a pointer to the section |
||
3085 | which we are really going to use. */ |
||
3086 | sec->output_section = bfd_abs_section_ptr; |
||
3087 | sec->kept_section = l->sec; |
||
3088 | return TRUE; |
||
3089 | } |
||
3090 | |||
3091 | /* This is used on non-ELF inputs. */ |
||
3092 | |||
3093 | bfd_boolean |
||
3094 | _bfd_generic_section_already_linked (bfd *abfd ATTRIBUTE_UNUSED, |
||
3095 | asection *sec, |
||
3096 | struct bfd_link_info *info) |
||
3097 | { |
||
3098 | const char *name; |
||
3099 | struct bfd_section_already_linked *l; |
||
3100 | struct bfd_section_already_linked_hash_entry *already_linked_list; |
||
3101 | |||
3102 | if ((sec->flags & SEC_LINK_ONCE) == 0) |
||
3103 | return FALSE; |
||
3104 | |||
3105 | /* The generic linker doesn't handle section groups. */ |
||
3106 | if ((sec->flags & SEC_GROUP) != 0) |
||
3107 | return FALSE; |
||
3108 | |||
3109 | /* FIXME: When doing a relocatable link, we may have trouble |
||
3110 | copying relocations in other sections that refer to local symbols |
||
3111 | in the section being discarded. Those relocations will have to |
||
3112 | be converted somehow; as of this writing I'm not sure that any of |
||
3113 | the backends handle that correctly. |
||
3114 | |||
3115 | It is tempting to instead not discard link once sections when |
||
3116 | doing a relocatable link (technically, they should be discarded |
||
3117 | whenever we are building constructors). However, that fails, |
||
3118 | because the linker winds up combining all the link once sections |
||
3119 | into a single large link once section, which defeats the purpose |
||
3120 | of having link once sections in the first place. */ |
||
3121 | |||
3122 | name = bfd_get_section_name (abfd, sec); |
||
3123 | |||
3124 | already_linked_list = bfd_section_already_linked_table_lookup (name); |
||
3125 | |||
3126 | l = already_linked_list->entry; |
||
3127 | if (l != NULL) |
||
3128 | { |
||
3129 | /* The section has already been linked. See if we should |
||
3130 | issue a warning. */ |
||
3131 | return _bfd_handle_already_linked (sec, l, info); |
||
3132 | } |
||
3133 | |||
3134 | /* This is the first section with this name. Record it. */ |
||
3135 | if (!bfd_section_already_linked_table_insert (already_linked_list, sec)) |
||
3136 | info->callbacks->einfo (_("%F%P: already_linked_table: %E\n")); |
||
3137 | return FALSE; |
||
3138 | } |
||
3139 | |||
3140 | /* Choose a neighbouring section to S in OBFD that will be output, or |
||
3141 | the absolute section if ADDR is out of bounds of the neighbours. */ |
||
3142 | |||
3143 | asection * |
||
3144 | _bfd_nearby_section (bfd *obfd, asection *s, bfd_vma addr) |
||
3145 | { |
||
3146 | asection *next, *prev, *best; |
||
3147 | |||
3148 | /* Find preceding kept section. */ |
||
3149 | for (prev = s->prev; prev != NULL; prev = prev->prev) |
||
3150 | if ((prev->flags & SEC_EXCLUDE) == 0 |
||
3151 | && !bfd_section_removed_from_list (obfd, prev)) |
||
3152 | break; |
||
3153 | |||
3154 | /* Find following kept section. Start at prev->next because |
||
3155 | other sections may have been added after S was removed. */ |
||
3156 | if (s->prev != NULL) |
||
3157 | next = s->prev->next; |
||
3158 | else |
||
3159 | next = s->owner->sections; |
||
3160 | for (; next != NULL; next = next->next) |
||
3161 | if ((next->flags & SEC_EXCLUDE) == 0 |
||
3162 | && !bfd_section_removed_from_list (obfd, next)) |
||
3163 | break; |
||
3164 | |||
3165 | /* Choose better of two sections, based on flags. The idea |
||
3166 | is to choose a section that will be in the same segment |
||
3167 | as S would have been if it was kept. */ |
||
3168 | best = next; |
||
3169 | if (prev == NULL) |
||
3170 | { |
||
3171 | if (next == NULL) |
||
3172 | best = bfd_abs_section_ptr; |
||
3173 | } |
||
3174 | else if (next == NULL) |
||
3175 | best = prev; |
||
3176 | else if (((prev->flags ^ next->flags) |
||
3177 | & (SEC_ALLOC | SEC_THREAD_LOCAL | SEC_LOAD)) != 0) |
||
3178 | { |
||
3179 | if (((next->flags ^ s->flags) |
||
3180 | & (SEC_ALLOC | SEC_THREAD_LOCAL)) != 0 |
||
3181 | /* We prefer to choose a loaded section. Section S |
||
3182 | doesn't have SEC_LOAD set (it being excluded, that |
||
3183 | part of the flag processing didn't happen) so we |
||
3184 | can't compare that flag to those of NEXT and PREV. */ |
||
3185 | || ((prev->flags & SEC_LOAD) != 0 |
||
3186 | && (next->flags & SEC_LOAD) == 0)) |
||
3187 | best = prev; |
||
3188 | } |
||
3189 | else if (((prev->flags ^ next->flags) & SEC_READONLY) != 0) |
||
3190 | { |
||
3191 | if (((next->flags ^ s->flags) & SEC_READONLY) != 0) |
||
3192 | best = prev; |
||
3193 | } |
||
3194 | else if (((prev->flags ^ next->flags) & SEC_CODE) != 0) |
||
3195 | { |
||
3196 | if (((next->flags ^ s->flags) & SEC_CODE) != 0) |
||
3197 | best = prev; |
||
3198 | } |
||
3199 | else |
||
3200 | { |
||
3201 | /* Flags we care about are the same. Prefer the following |
||
3202 | section if that will result in a positive valued sym. */ |
||
3203 | if (addr < next->vma) |
||
3204 | best = prev; |
||
3205 | } |
||
3206 | |||
3207 | return best; |
||
3208 | } |
||
3209 | |||
3210 | /* Convert symbols in excluded output sections to use a kept section. */ |
||
3211 | |||
3212 | static bfd_boolean |
||
3213 | fix_syms (struct bfd_link_hash_entry *h, void *data) |
||
3214 | { |
||
3215 | bfd *obfd = (bfd *) data; |
||
3216 | |||
3217 | if (h->type == bfd_link_hash_defined |
||
3218 | || h->type == bfd_link_hash_defweak) |
||
3219 | { |
||
3220 | asection *s = h->u.def.section; |
||
3221 | if (s != NULL |
||
3222 | && s->output_section != NULL |
||
3223 | && (s->output_section->flags & SEC_EXCLUDE) != 0 |
||
3224 | && bfd_section_removed_from_list (obfd, s->output_section)) |
||
3225 | { |
||
3226 | asection *op; |
||
3227 | |||
3228 | h->u.def.value += s->output_offset + s->output_section->vma; |
||
3229 | op = _bfd_nearby_section (obfd, s->output_section, h->u.def.value); |
||
3230 | h->u.def.value -= op->vma; |
||
3231 | h->u.def.section = op; |
||
3232 | } |
||
3233 | } |
||
3234 | |||
3235 | return TRUE; |
||
3236 | } |
||
3237 | |||
3238 | void |
||
3239 | _bfd_fix_excluded_sec_syms (bfd *obfd, struct bfd_link_info *info) |
||
3240 | { |
||
3241 | bfd_link_hash_traverse (info->hash, fix_syms, obfd); |
||
3242 | } |
||
3243 | |||
3244 | /* |
||
3245 | FUNCTION |
||
3246 | bfd_generic_define_common_symbol |
||
3247 | |||
3248 | SYNOPSIS |
||
3249 | bfd_boolean bfd_generic_define_common_symbol |
||
3250 | (bfd *output_bfd, struct bfd_link_info *info, |
||
3251 | struct bfd_link_hash_entry *h); |
||
3252 | |||
3253 | DESCRIPTION |
||
3254 | Convert common symbol @var{h} into a defined symbol. |
||
3255 | Return TRUE on success and FALSE on failure. |
||
3256 | |||
3257 | .#define bfd_define_common_symbol(output_bfd, info, h) \ |
||
3258 | . BFD_SEND (output_bfd, _bfd_define_common_symbol, (output_bfd, info, h)) |
||
3259 | . |
||
3260 | */ |
||
3261 | |||
3262 | bfd_boolean |
||
3263 | bfd_generic_define_common_symbol (bfd *output_bfd, |
||
3264 | struct bfd_link_info *info ATTRIBUTE_UNUSED, |
||
3265 | struct bfd_link_hash_entry *h) |
||
3266 | { |
||
3267 | unsigned int power_of_two; |
||
3268 | bfd_vma alignment, size; |
||
3269 | asection *section; |
||
3270 | |||
3271 | BFD_ASSERT (h != NULL && h->type == bfd_link_hash_common); |
||
3272 | |||
3273 | size = h->u.c.size; |
||
3274 | power_of_two = h->u.c.p->alignment_power; |
||
3275 | section = h->u.c.p->section; |
||
3276 | |||
3277 | /* Increase the size of the section to align the common symbol. |
||
3278 | The alignment must be a power of two. */ |
||
3279 | alignment = bfd_octets_per_byte (output_bfd) << power_of_two; |
||
3280 | BFD_ASSERT (alignment != 0 && (alignment & -alignment) == alignment); |
||
3281 | section->size += alignment - 1; |
||
3282 | section->size &= -alignment; |
||
3283 | |||
3284 | /* Adjust the section's overall alignment if necessary. */ |
||
3285 | if (power_of_two > section->alignment_power) |
||
3286 | section->alignment_power = power_of_two; |
||
3287 | |||
3288 | /* Change the symbol from common to defined. */ |
||
3289 | h->type = bfd_link_hash_defined; |
||
3290 | h->u.def.section = section; |
||
3291 | h->u.def.value = section->size; |
||
3292 | |||
3293 | /* Increase the size of the section. */ |
||
3294 | section->size += size; |
||
3295 | |||
3296 | /* Make sure the section is allocated in memory, and make sure that |
||
3297 | it is no longer a common section. */ |
||
3298 | section->flags |= SEC_ALLOC; |
||
3299 | section->flags &= ~SEC_IS_COMMON; |
||
3300 | return TRUE; |
||
3301 | } |
||
3302 | |||
3303 | /* |
||
3304 | FUNCTION |
||
3305 | bfd_find_version_for_sym |
||
3306 | |||
3307 | SYNOPSIS |
||
3308 | struct bfd_elf_version_tree * bfd_find_version_for_sym |
||
3309 | (struct bfd_elf_version_tree *verdefs, |
||
3310 | const char *sym_name, bfd_boolean *hide); |
||
3311 | |||
3312 | DESCRIPTION |
||
3313 | Search an elf version script tree for symbol versioning |
||
3314 | info and export / don't-export status for a given symbol. |
||
3315 | Return non-NULL on success and NULL on failure; also sets |
||
3316 | the output @samp{hide} boolean parameter. |
||
3317 | |||
3318 | */ |
||
3319 | |||
3320 | struct bfd_elf_version_tree * |
||
3321 | bfd_find_version_for_sym (struct bfd_elf_version_tree *verdefs, |
||
3322 | const char *sym_name, |
||
3323 | bfd_boolean *hide) |
||
3324 | { |
||
3325 | struct bfd_elf_version_tree *t; |
||
3326 | struct bfd_elf_version_tree *local_ver, *global_ver, *exist_ver; |
||
3327 | struct bfd_elf_version_tree *star_local_ver, *star_global_ver; |
||
3328 | |||
3329 | local_ver = NULL; |
||
3330 | global_ver = NULL; |
||
3331 | star_local_ver = NULL; |
||
3332 | star_global_ver = NULL; |
||
3333 | exist_ver = NULL; |
||
3334 | for (t = verdefs; t != NULL; t = t->next) |
||
3335 | { |
||
3336 | if (t->globals.list != NULL) |
||
3337 | { |
||
3338 | struct bfd_elf_version_expr *d = NULL; |
||
3339 | |||
3340 | while ((d = (*t->match) (&t->globals, d, sym_name)) != NULL) |
||
3341 | { |
||
3342 | if (d->literal || strcmp (d->pattern, "*") != 0) |
||
3343 | global_ver = t; |
||
3344 | else |
||
3345 | star_global_ver = t; |
||
3346 | if (d->symver) |
||
3347 | exist_ver = t; |
||
3348 | d->script = 1; |
||
3349 | /* If the match is a wildcard pattern, keep looking for |
||
3350 | a more explicit, perhaps even local, match. */ |
||
3351 | if (d->literal) |
||
3352 | break; |
||
3353 | } |
||
3354 | |||
3355 | if (d != NULL) |
||
3356 | break; |
||
3357 | } |
||
3358 | |||
3359 | if (t->locals.list != NULL) |
||
3360 | { |
||
3361 | struct bfd_elf_version_expr *d = NULL; |
||
3362 | |||
3363 | while ((d = (*t->match) (&t->locals, d, sym_name)) != NULL) |
||
3364 | { |
||
3365 | if (d->literal || strcmp (d->pattern, "*") != 0) |
||
3366 | local_ver = t; |
||
3367 | else |
||
3368 | star_local_ver = t; |
||
3369 | /* If the match is a wildcard pattern, keep looking for |
||
3370 | a more explicit, perhaps even global, match. */ |
||
3371 | if (d->literal) |
||
3372 | { |
||
3373 | /* An exact match overrides a global wildcard. */ |
||
3374 | global_ver = NULL; |
||
3375 | star_global_ver = NULL; |
||
3376 | break; |
||
3377 | } |
||
3378 | } |
||
3379 | |||
3380 | if (d != NULL) |
||
3381 | break; |
||
3382 | } |
||
3383 | } |
||
3384 | |||
3385 | if (global_ver == NULL && local_ver == NULL) |
||
3386 | global_ver = star_global_ver; |
||
3387 | |||
3388 | if (global_ver != NULL) |
||
3389 | { |
||
3390 | /* If we already have a versioned symbol that matches the |
||
3391 | node for this symbol, then we don't want to create a |
||
3392 | duplicate from the unversioned symbol. Instead hide the |
||
3393 | unversioned symbol. */ |
||
3394 | *hide = exist_ver == global_ver; |
||
3395 | return global_ver; |
||
3396 | } |
||
3397 | |||
3398 | if (local_ver == NULL) |
||
3399 | local_ver = star_local_ver; |
||
3400 | |||
3401 | if (local_ver != NULL) |
||
3402 | { |
||
3403 | *hide = TRUE; |
||
3404 | return local_ver; |
||
3405 | } |
||
3406 | |||
3407 | return NULL; |
||
3408 | } |
||
3409 | |||
3410 | /* |
||
3411 | FUNCTION |
||
3412 | bfd_hide_sym_by_version |
||
3413 | |||
3414 | SYNOPSIS |
||
3415 | bfd_boolean bfd_hide_sym_by_version |
||
3416 | (struct bfd_elf_version_tree *verdefs, const char *sym_name); |
||
3417 | |||
3418 | DESCRIPTION |
||
3419 | Search an elf version script tree for symbol versioning |
||
3420 | info for a given symbol. Return TRUE if the symbol is hidden. |
||
3421 | |||
3422 | */ |
||
3423 | |||
3424 | bfd_boolean |
||
3425 | bfd_hide_sym_by_version (struct bfd_elf_version_tree *verdefs, |
||
3426 | const char *sym_name) |
||
3427 | { |
||
3428 | bfd_boolean hidden = FALSE; |
||
3429 | bfd_find_version_for_sym (verdefs, sym_name, &hidden); |
||
3430 | return hidden; |
||
3431 | }><>>>>>>>>>>>>>>> |