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5197 | serge | 1 | /* BFD back-end for binary objects. |
2 | Copyright 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, |
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3 | 2004, 2005, 2006, 2007, 2009, 2011 Free Software Foundation, Inc. |
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4 | Written by Ian Lance Taylor, Cygnus Support, |
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5 | |||
6 | This file is part of BFD, the Binary File Descriptor library. |
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7 | |||
8 | This program is free software; you can redistribute it and/or modify |
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9 | it under the terms of the GNU General Public License as published by |
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10 | the Free Software Foundation; either version 3 of the License, or |
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11 | (at your option) any later version. |
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12 | |||
13 | This program is distributed in the hope that it will be useful, |
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14 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
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15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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16 | GNU General Public License for more details. |
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17 | |||
18 | You should have received a copy of the GNU General Public License |
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19 | along with this program; if not, write to the Free Software |
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20 | Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, |
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21 | MA 02110-1301, USA. */ |
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22 | |||
23 | /* This is a BFD backend which may be used to write binary objects. |
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24 | It may only be used for output, not input. The intention is that |
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25 | this may be used as an output format for objcopy in order to |
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26 | generate raw binary data. |
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27 | |||
28 | This is very simple. The only complication is that the real data |
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29 | will start at some address X, and in some cases we will not want to |
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30 | include X zeroes just to get to that point. Since the start |
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31 | address is not meaningful for this object file format, we use it |
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32 | instead to indicate the number of zeroes to skip at the start of |
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33 | the file. objcopy cooperates by specially setting the start |
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34 | address to zero by default. */ |
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35 | |||
36 | #include "sysdep.h" |
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37 | #include "bfd.h" |
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38 | #include "safe-ctype.h" |
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39 | #include "libbfd.h" |
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40 | |||
41 | /* Any bfd we create by reading a binary file has three symbols: |
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42 | a start symbol, an end symbol, and an absolute length symbol. */ |
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43 | #define BIN_SYMS 3 |
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44 | |||
45 | /* Create a binary object. Invoked via bfd_set_format. */ |
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46 | |||
47 | static bfd_boolean |
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48 | binary_mkobject (bfd *abfd ATTRIBUTE_UNUSED) |
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49 | { |
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50 | return TRUE; |
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51 | } |
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52 | |||
53 | /* Any file may be considered to be a binary file, provided the target |
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54 | was not defaulted. That is, it must be explicitly specified as |
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55 | being binary. */ |
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56 | |||
57 | static const bfd_target * |
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58 | binary_object_p (bfd *abfd) |
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59 | { |
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60 | struct stat statbuf; |
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61 | asection *sec; |
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62 | flagword flags; |
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63 | |||
64 | if (abfd->target_defaulted) |
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65 | { |
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66 | bfd_set_error (bfd_error_wrong_format); |
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67 | return NULL; |
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68 | } |
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69 | |||
70 | abfd->symcount = BIN_SYMS; |
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71 | |||
72 | /* Find the file size. */ |
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73 | if (bfd_stat (abfd, &statbuf) < 0) |
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74 | { |
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75 | bfd_set_error (bfd_error_system_call); |
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76 | return NULL; |
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77 | } |
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78 | |||
79 | /* One data section. */ |
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80 | flags = SEC_ALLOC | SEC_LOAD | SEC_DATA | SEC_HAS_CONTENTS; |
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81 | sec = bfd_make_section_with_flags (abfd, ".data", flags); |
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82 | if (sec == NULL) |
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83 | return NULL; |
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84 | sec->vma = 0; |
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85 | sec->size = statbuf.st_size; |
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86 | sec->filepos = 0; |
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87 | |||
88 | abfd->tdata.any = (void *) sec; |
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89 | |||
90 | return abfd->xvec; |
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91 | } |
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92 | |||
93 | #define binary_close_and_cleanup _bfd_generic_close_and_cleanup |
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94 | #define binary_bfd_free_cached_info _bfd_generic_bfd_free_cached_info |
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95 | #define binary_new_section_hook _bfd_generic_new_section_hook |
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96 | |||
97 | /* Get contents of the only section. */ |
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98 | |||
99 | static bfd_boolean |
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100 | binary_get_section_contents (bfd *abfd, |
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101 | asection *section ATTRIBUTE_UNUSED, |
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102 | void * location, |
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103 | file_ptr offset, |
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104 | bfd_size_type count) |
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105 | { |
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106 | if (bfd_seek (abfd, offset, SEEK_SET) != 0 |
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107 | || bfd_bread (location, count, abfd) != count) |
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108 | return FALSE; |
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109 | return TRUE; |
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110 | } |
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111 | |||
112 | /* Return the amount of memory needed to read the symbol table. */ |
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113 | |||
114 | static long |
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115 | binary_get_symtab_upper_bound (bfd *abfd ATTRIBUTE_UNUSED) |
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116 | { |
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117 | return (BIN_SYMS + 1) * sizeof (asymbol *); |
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118 | } |
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119 | |||
120 | /* Create a symbol name based on the bfd's filename. */ |
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121 | |||
122 | static char * |
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123 | mangle_name (bfd *abfd, char *suffix) |
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124 | { |
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125 | bfd_size_type size; |
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126 | char *buf; |
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127 | char *p; |
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128 | |||
129 | size = (strlen (bfd_get_filename (abfd)) |
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130 | + strlen (suffix) |
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131 | + sizeof "_binary__"); |
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132 | |||
133 | buf = (char *) bfd_alloc (abfd, size); |
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134 | if (buf == NULL) |
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135 | return ""; |
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136 | |||
137 | sprintf (buf, "_binary_%s_%s", bfd_get_filename (abfd), suffix); |
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138 | |||
139 | /* Change any non-alphanumeric characters to underscores. */ |
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140 | for (p = buf; *p; p++) |
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141 | if (! ISALNUM (*p)) |
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142 | *p = '_'; |
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143 | |||
144 | return buf; |
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145 | } |
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146 | |||
147 | /* Return the symbol table. */ |
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148 | |||
149 | static long |
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150 | binary_canonicalize_symtab (bfd *abfd, asymbol **alocation) |
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151 | { |
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152 | asection *sec = (asection *) abfd->tdata.any; |
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153 | asymbol *syms; |
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154 | unsigned int i; |
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155 | bfd_size_type amt = BIN_SYMS * sizeof (asymbol); |
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156 | |||
157 | syms = (asymbol *) bfd_alloc (abfd, amt); |
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158 | if (syms == NULL) |
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159 | return -1; |
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160 | |||
161 | /* Start symbol. */ |
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162 | syms[0].the_bfd = abfd; |
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163 | syms[0].name = mangle_name (abfd, "start"); |
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164 | syms[0].value = 0; |
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165 | syms[0].flags = BSF_GLOBAL; |
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166 | syms[0].section = sec; |
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167 | syms[0].udata.p = NULL; |
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168 | |||
169 | /* End symbol. */ |
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170 | syms[1].the_bfd = abfd; |
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171 | syms[1].name = mangle_name (abfd, "end"); |
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172 | syms[1].value = sec->size; |
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173 | syms[1].flags = BSF_GLOBAL; |
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174 | syms[1].section = sec; |
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175 | syms[1].udata.p = NULL; |
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176 | |||
177 | /* Size symbol. */ |
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178 | syms[2].the_bfd = abfd; |
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179 | syms[2].name = mangle_name (abfd, "size"); |
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180 | syms[2].value = sec->size; |
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181 | syms[2].flags = BSF_GLOBAL; |
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182 | syms[2].section = bfd_abs_section_ptr; |
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183 | syms[2].udata.p = NULL; |
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184 | |||
185 | for (i = 0; i < BIN_SYMS; i++) |
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186 | *alocation++ = syms++; |
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187 | *alocation = NULL; |
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188 | |||
189 | return BIN_SYMS; |
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190 | } |
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191 | |||
192 | #define binary_make_empty_symbol _bfd_generic_make_empty_symbol |
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193 | #define binary_print_symbol _bfd_nosymbols_print_symbol |
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194 | |||
195 | /* Get information about a symbol. */ |
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196 | |||
197 | static void |
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198 | binary_get_symbol_info (bfd *ignore_abfd ATTRIBUTE_UNUSED, |
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199 | asymbol *symbol, |
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200 | symbol_info *ret) |
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201 | { |
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202 | bfd_symbol_info (symbol, ret); |
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203 | } |
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204 | |||
205 | #define binary_bfd_is_local_label_name bfd_generic_is_local_label_name |
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206 | #define binary_get_lineno _bfd_nosymbols_get_lineno |
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207 | #define binary_find_nearest_line _bfd_nosymbols_find_nearest_line |
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208 | #define binary_find_inliner_info _bfd_nosymbols_find_inliner_info |
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209 | #define binary_bfd_make_debug_symbol _bfd_nosymbols_bfd_make_debug_symbol |
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210 | #define binary_read_minisymbols _bfd_generic_read_minisymbols |
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211 | #define binary_minisymbol_to_symbol _bfd_generic_minisymbol_to_symbol |
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212 | #define binary_bfd_is_target_special_symbol ((bfd_boolean (*) (bfd *, asymbol *)) bfd_false) |
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213 | |||
214 | /* Set the architecture of a binary file. */ |
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215 | #define binary_set_arch_mach _bfd_generic_set_arch_mach |
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216 | |||
217 | /* Write section contents of a binary file. */ |
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218 | |||
219 | static bfd_boolean |
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220 | binary_set_section_contents (bfd *abfd, |
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221 | asection *sec, |
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222 | const void * data, |
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223 | file_ptr offset, |
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224 | bfd_size_type size) |
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225 | { |
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226 | if (size == 0) |
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227 | return TRUE; |
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228 | |||
229 | if (! abfd->output_has_begun) |
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230 | { |
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231 | bfd_boolean found_low; |
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232 | bfd_vma low; |
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233 | asection *s; |
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234 | |||
235 | /* The lowest section LMA sets the virtual address of the start |
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236 | of the file. We use this to set the file position of all the |
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237 | sections. */ |
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238 | found_low = FALSE; |
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239 | low = 0; |
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240 | for (s = abfd->sections; s != NULL; s = s->next) |
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241 | if (((s->flags |
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242 | & (SEC_HAS_CONTENTS | SEC_LOAD | SEC_ALLOC | SEC_NEVER_LOAD)) |
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243 | == (SEC_HAS_CONTENTS | SEC_LOAD | SEC_ALLOC)) |
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244 | && (s->size > 0) |
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245 | && (! found_low || s->lma < low)) |
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246 | { |
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247 | low = s->lma; |
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248 | found_low = TRUE; |
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249 | } |
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250 | |||
251 | for (s = abfd->sections; s != NULL; s = s->next) |
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252 | { |
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253 | s->filepos = s->lma - low; |
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254 | |||
255 | /* Skip following warning check for sections that will not |
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256 | occupy file space. */ |
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257 | if ((s->flags |
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258 | & (SEC_HAS_CONTENTS | SEC_ALLOC | SEC_NEVER_LOAD)) |
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259 | != (SEC_HAS_CONTENTS | SEC_ALLOC) |
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260 | || (s->size == 0)) |
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261 | continue; |
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262 | |||
263 | /* If attempting to generate a binary file from a bfd with |
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264 | LMA's all over the place, huge (sparse?) binary files may |
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265 | result. This condition attempts to detect this situation |
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266 | and print a warning. Better heuristics would be nice to |
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267 | have. */ |
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268 | |||
269 | if (s->filepos < 0) |
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270 | (*_bfd_error_handler) |
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271 | (_("Warning: Writing section `%s' to huge (ie negative) file offset 0x%lx."), |
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272 | bfd_get_section_name (abfd, s), |
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273 | (unsigned long) s->filepos); |
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274 | } |
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275 | |||
276 | abfd->output_has_begun = TRUE; |
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277 | } |
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278 | |||
279 | /* We don't want to output anything for a section that is neither |
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280 | loaded nor allocated. The contents of such a section are not |
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281 | meaningful in the binary format. */ |
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282 | if ((sec->flags & (SEC_LOAD | SEC_ALLOC)) == 0) |
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283 | return TRUE; |
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284 | if ((sec->flags & SEC_NEVER_LOAD) != 0) |
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285 | return TRUE; |
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286 | |||
287 | return _bfd_generic_set_section_contents (abfd, sec, data, offset, size); |
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288 | } |
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289 | |||
290 | /* No space is required for header information. */ |
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291 | |||
292 | static int |
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293 | binary_sizeof_headers (bfd *abfd ATTRIBUTE_UNUSED, |
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294 | struct bfd_link_info *info ATTRIBUTE_UNUSED) |
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295 | { |
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296 | return 0; |
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297 | } |
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298 | |||
299 | #define binary_bfd_get_relocated_section_contents bfd_generic_get_relocated_section_contents |
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300 | #define binary_bfd_relax_section bfd_generic_relax_section |
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301 | #define binary_bfd_gc_sections bfd_generic_gc_sections |
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302 | #define binary_bfd_lookup_section_flags bfd_generic_lookup_section_flags |
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303 | #define binary_bfd_merge_sections bfd_generic_merge_sections |
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304 | #define binary_bfd_is_group_section bfd_generic_is_group_section |
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305 | #define binary_bfd_discard_group bfd_generic_discard_group |
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306 | #define binary_section_already_linked _bfd_generic_section_already_linked |
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307 | #define binary_bfd_define_common_symbol bfd_generic_define_common_symbol |
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308 | #define binary_bfd_link_hash_table_create _bfd_generic_link_hash_table_create |
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309 | #define binary_bfd_link_hash_table_free _bfd_generic_link_hash_table_free |
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310 | #define binary_bfd_link_just_syms _bfd_generic_link_just_syms |
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311 | #define binary_bfd_copy_link_hash_symbol_type \ |
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312 | _bfd_generic_copy_link_hash_symbol_type |
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313 | #define binary_bfd_link_add_symbols _bfd_generic_link_add_symbols |
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314 | #define binary_bfd_final_link _bfd_generic_final_link |
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315 | #define binary_bfd_link_split_section _bfd_generic_link_split_section |
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316 | #define binary_get_section_contents_in_window _bfd_generic_get_section_contents_in_window |
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317 | |||
318 | const bfd_target binary_vec = |
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319 | { |
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320 | "binary", /* name */ |
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321 | bfd_target_unknown_flavour, /* flavour */ |
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322 | BFD_ENDIAN_UNKNOWN, /* byteorder */ |
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323 | BFD_ENDIAN_UNKNOWN, /* header_byteorder */ |
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324 | EXEC_P, /* object_flags */ |
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325 | (SEC_ALLOC | SEC_LOAD | SEC_READONLY | SEC_CODE | SEC_DATA |
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326 | | SEC_ROM | SEC_HAS_CONTENTS), /* section_flags */ |
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327 | 0, /* symbol_leading_char */ |
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328 | ' ', /* ar_pad_char */ |
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329 | 16, /* ar_max_namelen */ |
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330 | 255, /* match priority. */ |
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331 | bfd_getb64, bfd_getb_signed_64, bfd_putb64, |
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332 | bfd_getb32, bfd_getb_signed_32, bfd_putb32, |
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333 | bfd_getb16, bfd_getb_signed_16, bfd_putb16, /* data */ |
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334 | bfd_getb64, bfd_getb_signed_64, bfd_putb64, |
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335 | bfd_getb32, bfd_getb_signed_32, bfd_putb32, |
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336 | bfd_getb16, bfd_getb_signed_16, bfd_putb16, /* hdrs */ |
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337 | { /* bfd_check_format */ |
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338 | _bfd_dummy_target, |
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339 | binary_object_p, |
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340 | _bfd_dummy_target, |
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341 | _bfd_dummy_target, |
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342 | }, |
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343 | { /* bfd_set_format */ |
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344 | bfd_false, |
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345 | binary_mkobject, |
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346 | bfd_false, |
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347 | bfd_false, |
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348 | }, |
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349 | { /* bfd_write_contents */ |
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350 | bfd_false, |
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351 | bfd_true, |
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352 | bfd_false, |
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353 | bfd_false, |
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354 | }, |
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355 | |||
356 | BFD_JUMP_TABLE_GENERIC (binary), |
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357 | BFD_JUMP_TABLE_COPY (_bfd_generic), |
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358 | BFD_JUMP_TABLE_CORE (_bfd_nocore), |
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359 | BFD_JUMP_TABLE_ARCHIVE (_bfd_noarchive), |
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360 | BFD_JUMP_TABLE_SYMBOLS (binary), |
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361 | BFD_JUMP_TABLE_RELOCS (_bfd_norelocs), |
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362 | BFD_JUMP_TABLE_WRITE (binary), |
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363 | BFD_JUMP_TABLE_LINK (binary), |
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364 | BFD_JUMP_TABLE_DYNAMIC (_bfd_nodynamic), |
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365 | |||
366 | NULL, |
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367 | |||
368 | NULL |
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369 | };>>>> |