1 | /* |
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2 | * COPYRIGHT (c) 2012 Chris Johns <chrisj@rtems.org> |
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3 | * |
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4 | * The license and distribution terms for this file may be |
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5 | * found in the file LICENSE in this distribution or at |
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6 | * http://www.rtems.org/license/LICENSE. |
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7 | */ |
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8 | /** |
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9 | * @file |
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10 | * |
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11 | * @ingroup rtems_rtld |
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12 | * |
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13 | * @brief RTEMS Run-Time Link Editor |
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14 | * |
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15 | * This is the RTL implementation. |
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16 | */ |
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17 | |
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18 | #if HAVE_CONFIG_H |
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19 | #include "config.h" |
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20 | #endif |
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21 | |
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22 | #include <stdlib.h> |
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23 | #include <stdio.h> |
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24 | #include <string.h> |
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25 | |
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26 | #include <rtems/libio_.h> |
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27 | |
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28 | #include <rtems/rtl/rtl.h> |
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29 | #include <rtems/rtl/rtl-allocator.h> |
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30 | #include "rtl-error.h" |
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31 | #include "rtl-string.h" |
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32 | #include <rtems/rtl/rtl-trace.h> |
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33 | |
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34 | /** |
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35 | * Semaphore configuration to create a mutex. |
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36 | */ |
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37 | #define RTEMS_MUTEX_ATTRIBS \ |
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38 | (RTEMS_PRIORITY | RTEMS_BINARY_SEMAPHORE | \ |
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39 | RTEMS_INHERIT_PRIORITY | RTEMS_NO_PRIORITY_CEILING | RTEMS_LOCAL) |
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40 | |
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41 | /** |
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42 | * Symbol table cache size. They can be big so the cache needs space to work. |
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43 | */ |
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44 | #define RTEMS_RTL_ELF_SYMBOL_CACHE (2048) |
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45 | |
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46 | /** |
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47 | * String table cache size. |
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48 | */ |
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49 | #define RTEMS_RTL_ELF_STRING_CACHE (2048) |
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50 | |
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51 | /** |
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52 | * Relocations table cache size. |
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53 | */ |
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54 | #define RTEMS_RTL_ELF_RELOC_CACHE (2048) |
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55 | |
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56 | /** |
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57 | * Decompression output buffer. |
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58 | */ |
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59 | #define RTEMS_RTL_COMP_OUTPUT (2048) |
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60 | |
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61 | /** |
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62 | * Static RTL data is returned to the user when the linker is locked. |
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63 | */ |
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64 | static rtems_rtl_data_t* rtl; |
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65 | static bool rtl_data_init; |
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66 | |
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67 | /** |
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68 | * Define a default base global symbol loader function that is weak |
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69 | * so a real table can be linked in when the user wants one. |
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70 | */ |
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71 | void rtems_rtl_base_global_syms_init (void) __attribute__ ((weak)); |
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72 | void |
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73 | rtems_rtl_base_global_syms_init (void) |
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74 | { |
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75 | /* |
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76 | * Do nothing. |
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77 | */ |
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78 | } |
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79 | |
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80 | static bool |
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81 | rtems_rtl_data_init (void) |
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82 | { |
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83 | /* |
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84 | * Lock the RTL. We only create a lock if a call is made. First we test if a |
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85 | * lock is present. If one is present we lock it. If not the libio lock is |
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86 | * locked and we then test the lock again. If not present we create the lock |
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87 | * then release libio lock. |
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88 | */ |
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89 | if (!rtl) |
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90 | { |
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91 | rtems_libio_lock (); |
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92 | |
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93 | if (!rtl) |
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94 | { |
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95 | rtems_status_code sc; |
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96 | rtems_id lock; |
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97 | |
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98 | /* |
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99 | * We cannot set an error in this code because there is no RTL data to |
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100 | * hold it. |
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101 | */ |
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102 | |
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103 | if (rtl_data_init) |
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104 | { |
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105 | rtems_libio_unlock (); |
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106 | return false; |
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107 | } |
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108 | |
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109 | rtl_data_init = true; |
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110 | |
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111 | /* |
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112 | * Always in the heap. |
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113 | */ |
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114 | rtl = malloc (sizeof (rtems_rtl_data_t)); |
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115 | if (!rtl) |
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116 | { |
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117 | rtems_libio_unlock (); |
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118 | errno = ENOMEM; |
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119 | return false; |
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120 | } |
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121 | |
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122 | *rtl = (rtems_rtl_data_t) { 0 }; |
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123 | |
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124 | /* |
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125 | * The initialise the allocator data. |
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126 | */ |
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127 | rtems_rtl_alloc_initialise (&rtl->allocator); |
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128 | |
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129 | /* |
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130 | * Create the RTL lock. |
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131 | */ |
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132 | sc = rtems_semaphore_create (rtems_build_name ('R', 'T', 'L', 'D'), |
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133 | 1, RTEMS_MUTEX_ATTRIBS, |
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134 | RTEMS_NO_PRIORITY, &lock); |
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135 | if (sc != RTEMS_SUCCESSFUL) |
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136 | { |
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137 | free (rtl); |
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138 | rtems_libio_unlock (); |
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139 | return false; |
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140 | } |
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141 | |
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142 | sc = rtems_semaphore_obtain (lock, RTEMS_WAIT, RTEMS_NO_TIMEOUT); |
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143 | if (sc != RTEMS_SUCCESSFUL) |
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144 | { |
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145 | rtems_semaphore_delete (lock); |
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146 | free (rtl); |
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147 | rtems_libio_unlock (); |
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148 | return false; |
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149 | } |
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150 | |
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151 | rtl->lock = lock; |
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152 | |
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153 | /* |
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154 | * Initialise the objects list and create any required services. |
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155 | */ |
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156 | rtems_chain_initialize_empty (&rtl->objects); |
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157 | |
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158 | if (!rtems_rtl_symbol_table_open (&rtl->globals, |
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159 | RTEMS_RTL_SYMS_GLOBAL_BUCKETS)) |
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160 | { |
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161 | rtems_semaphore_delete (lock); |
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162 | free (rtl); |
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163 | rtems_libio_unlock (); |
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164 | return false; |
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165 | } |
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166 | |
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167 | if (!rtems_rtl_unresolved_table_open (&rtl->unresolved, |
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168 | RTEMS_RTL_UNRESOLVED_BLOCK_SIZE)) |
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169 | { |
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170 | rtems_rtl_symbol_table_close (&rtl->globals); |
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171 | rtems_semaphore_delete (lock); |
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172 | free (rtl); |
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173 | rtems_libio_unlock (); |
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174 | return false; |
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175 | } |
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176 | |
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177 | if (!rtems_rtl_obj_cache_open (&rtl->symbols, |
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178 | RTEMS_RTL_ELF_SYMBOL_CACHE)) |
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179 | { |
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180 | rtems_rtl_symbol_table_close (&rtl->globals); |
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181 | rtems_rtl_unresolved_table_close (&rtl->unresolved); |
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182 | rtems_semaphore_delete (lock); |
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183 | free (rtl); |
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184 | rtems_libio_unlock (); |
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185 | return false; |
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186 | } |
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187 | |
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188 | if (!rtems_rtl_obj_cache_open (&rtl->strings, |
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189 | RTEMS_RTL_ELF_STRING_CACHE)) |
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190 | { |
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191 | rtems_rtl_obj_cache_close (&rtl->symbols); |
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192 | rtems_rtl_unresolved_table_close (&rtl->unresolved); |
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193 | rtems_rtl_symbol_table_close (&rtl->globals); |
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194 | rtems_semaphore_delete (lock); |
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195 | free (rtl); |
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196 | rtems_libio_unlock (); |
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197 | return false; |
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198 | } |
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199 | |
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200 | if (!rtems_rtl_obj_cache_open (&rtl->relocs, |
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201 | RTEMS_RTL_ELF_RELOC_CACHE)) |
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202 | { |
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203 | rtems_rtl_obj_cache_close (&rtl->strings); |
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204 | rtems_rtl_obj_cache_close (&rtl->symbols); |
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205 | rtems_rtl_unresolved_table_close (&rtl->unresolved); |
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206 | rtems_rtl_symbol_table_close (&rtl->globals); |
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207 | rtems_semaphore_delete (lock); |
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208 | free (rtl); |
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209 | rtems_libio_unlock (); |
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210 | return false; |
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211 | } |
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212 | |
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213 | if (!rtems_rtl_obj_comp_open (&rtl->decomp, |
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214 | RTEMS_RTL_COMP_OUTPUT)) |
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215 | { |
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216 | rtems_rtl_obj_cache_close (&rtl->relocs); |
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217 | rtems_rtl_obj_cache_close (&rtl->strings); |
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218 | rtems_rtl_obj_cache_close (&rtl->symbols); |
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219 | rtems_rtl_unresolved_table_close (&rtl->unresolved); |
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220 | rtems_rtl_symbol_table_close (&rtl->globals); |
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221 | rtems_semaphore_delete (lock); |
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222 | free (rtl); |
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223 | rtems_libio_unlock (); |
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224 | return false; |
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225 | } |
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226 | |
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227 | rtl->base = rtems_rtl_obj_alloc (); |
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228 | if (!rtl->base) |
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229 | { |
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230 | rtems_rtl_obj_comp_close (&rtl->decomp); |
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231 | rtems_rtl_obj_cache_close (&rtl->relocs); |
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232 | rtems_rtl_obj_cache_close (&rtl->strings); |
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233 | rtems_rtl_obj_cache_close (&rtl->symbols); |
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234 | rtems_rtl_unresolved_table_close (&rtl->unresolved); |
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235 | rtems_rtl_symbol_table_close (&rtl->globals); |
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236 | rtems_semaphore_delete (lock); |
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237 | free (rtl); |
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238 | rtems_libio_unlock (); |
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239 | return false; |
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240 | } |
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241 | |
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242 | /* |
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243 | * Need to malloc the memory so the free does not complain. |
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244 | */ |
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245 | rtl->base->oname = rtems_rtl_strdup ("rtems-kernel"); |
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246 | |
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247 | rtems_chain_append (&rtl->objects, &rtl->base->link); |
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248 | } |
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249 | |
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250 | rtems_libio_unlock (); |
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251 | |
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252 | rtems_rtl_path_append ("."); |
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253 | |
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254 | rtems_rtl_base_global_syms_init (); |
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255 | |
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256 | rtems_rtl_unlock (); |
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257 | } |
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258 | return true; |
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259 | } |
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260 | |
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261 | rtems_rtl_data_t* |
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262 | rtems_rtl_data (void) |
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263 | { |
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264 | return rtl; |
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265 | } |
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266 | |
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267 | rtems_rtl_symbols_t* |
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268 | rtems_rtl_global_symbols (void) |
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269 | { |
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270 | if (!rtl) |
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271 | { |
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272 | rtems_rtl_set_error (ENOENT, "no rtl"); |
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273 | return NULL; |
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274 | } |
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275 | return &rtl->globals; |
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276 | } |
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277 | |
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278 | rtems_rtl_unresolved_t* |
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279 | rtems_rtl_unresolved (void) |
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280 | { |
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281 | if (!rtl) |
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282 | { |
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283 | rtems_rtl_set_error (ENOENT, "no rtl"); |
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284 | return NULL; |
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285 | } |
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286 | return &rtl->unresolved; |
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287 | } |
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288 | |
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289 | void |
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290 | rtems_rtl_obj_caches (rtems_rtl_obj_cache_t** symbols, |
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291 | rtems_rtl_obj_cache_t** strings, |
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292 | rtems_rtl_obj_cache_t** relocs) |
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293 | { |
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294 | if (!rtl) |
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295 | { |
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296 | if (symbols) |
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297 | *symbols = NULL; |
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298 | if (strings) |
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299 | *strings = NULL; |
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300 | if (relocs) |
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301 | *relocs = NULL; |
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302 | } |
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303 | else |
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304 | { |
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305 | if (symbols) |
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306 | *symbols = &rtl->symbols; |
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307 | if (strings) |
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308 | *strings = &rtl->strings; |
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309 | if (relocs) |
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310 | *relocs = &rtl->relocs; |
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311 | } |
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312 | } |
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313 | |
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314 | void |
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315 | rtems_rtl_obj_caches_flush (void) |
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316 | { |
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317 | if (rtl) |
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318 | { |
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319 | rtems_rtl_obj_cache_flush (&rtl->symbols); |
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320 | rtems_rtl_obj_cache_flush (&rtl->strings); |
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321 | rtems_rtl_obj_cache_flush (&rtl->relocs); |
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322 | } |
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323 | } |
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324 | |
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325 | void |
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326 | rtems_rtl_obj_comp (rtems_rtl_obj_comp_t** decomp, |
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327 | rtems_rtl_obj_cache_t* cache, |
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328 | int fd, |
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329 | int compression, |
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330 | off_t offset) |
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331 | { |
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332 | if (!rtl) |
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333 | { |
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334 | *decomp = NULL; |
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335 | } |
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336 | else |
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337 | { |
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338 | *decomp = &rtl->decomp; |
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339 | rtems_rtl_obj_comp_set (*decomp, cache, fd, compression, offset); |
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340 | } |
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341 | } |
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342 | |
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343 | rtems_rtl_data_t* |
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344 | rtems_rtl_lock (void) |
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345 | { |
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346 | rtems_status_code sc; |
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347 | |
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348 | if (!rtems_rtl_data_init ()) |
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349 | return NULL; |
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350 | |
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351 | sc = rtems_semaphore_obtain (rtl->lock, |
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352 | RTEMS_WAIT, RTEMS_NO_TIMEOUT); |
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353 | if (sc != RTEMS_SUCCESSFUL) |
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354 | { |
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355 | errno = EINVAL; |
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356 | return NULL; |
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357 | } |
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358 | |
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359 | return rtl; |
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360 | } |
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361 | |
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362 | bool |
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363 | rtems_rtl_unlock (void) |
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364 | { |
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365 | /* |
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366 | * Not sure any error should be returned or an assert. |
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367 | */ |
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368 | rtems_status_code sc; |
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369 | sc = rtems_semaphore_release (rtl->lock); |
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370 | if ((sc != RTEMS_SUCCESSFUL) && (errno == 0)) |
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371 | { |
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372 | errno = EINVAL; |
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373 | return false; |
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374 | } |
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375 | return true; |
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376 | } |
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377 | |
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378 | rtems_rtl_obj_t* |
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379 | rtems_rtl_check_handle (void* handle) |
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380 | { |
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381 | rtems_rtl_obj_t* obj; |
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382 | rtems_chain_node* node; |
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383 | |
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384 | obj = handle; |
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385 | node = rtems_chain_first (&rtl->objects); |
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386 | |
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387 | while (!rtems_chain_is_tail (&rtl->objects, node)) |
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388 | { |
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389 | rtems_rtl_obj_t* check = (rtems_rtl_obj_t*) node; |
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390 | if (check == obj) |
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391 | return obj; |
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392 | node = rtems_chain_next (node); |
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393 | } |
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394 | |
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395 | return NULL; |
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396 | } |
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397 | |
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398 | rtems_rtl_obj_t* |
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399 | rtems_rtl_find_obj (const char* name) |
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400 | { |
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401 | rtems_chain_node* node; |
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402 | rtems_rtl_obj_t* found = NULL; |
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403 | const char* aname = NULL; |
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404 | const char* oname = NULL; |
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405 | off_t ooffset; |
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406 | |
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407 | if (!rtems_rtl_parse_name (name, &aname, &oname, &ooffset)) |
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408 | return NULL; |
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409 | |
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410 | node = rtems_chain_first (&rtl->objects); |
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411 | |
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412 | while (!rtems_chain_is_tail (&rtl->objects, node)) |
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413 | { |
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414 | rtems_rtl_obj_t* obj = (rtems_rtl_obj_t*) node; |
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415 | if ((aname == NULL && strcmp (obj->oname, oname) == 0) || |
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416 | (aname != NULL && |
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417 | strcmp (obj->aname, aname) == 0 && strcmp (obj->oname, oname) == 0)) |
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418 | { |
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419 | found = obj; |
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420 | break; |
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421 | } |
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422 | node = rtems_chain_next (node); |
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423 | } |
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424 | |
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425 | if (!aname) |
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426 | rtems_rtl_alloc_del(RTEMS_RTL_ALLOC_OBJECT, (void*) aname); |
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427 | |
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428 | if (!oname) |
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429 | rtems_rtl_alloc_del(RTEMS_RTL_ALLOC_OBJECT, (void*) oname); |
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430 | |
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431 | return found; |
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432 | } |
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433 | |
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434 | rtems_rtl_obj_t* |
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435 | rtems_rtl_load_object (const char* name, int mode) |
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436 | { |
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437 | rtems_rtl_obj_t* obj; |
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438 | |
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439 | if (rtems_rtl_trace (RTEMS_RTL_TRACE_LOAD)) |
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440 | printf ("rtl: loading '%s'\n", name); |
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441 | |
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442 | /* |
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443 | * See if the object module has already been loaded. |
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444 | */ |
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445 | obj = rtems_rtl_find_obj (name); |
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446 | if (!obj) |
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447 | { |
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448 | /* |
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449 | * Allocate a new object file descriptor and attempt to load it. |
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450 | */ |
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451 | obj = rtems_rtl_obj_alloc (); |
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452 | if (obj == NULL) |
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453 | { |
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454 | rtems_rtl_set_error (ENOMEM, "no memory for object descriptor"); |
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455 | return NULL; |
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456 | } |
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457 | |
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458 | /* |
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459 | * Find the file in the file system using the search path. The fname field |
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460 | * will point to a valid file name if found. |
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461 | */ |
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462 | if (!rtems_rtl_obj_find_file (obj, name)) |
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463 | { |
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464 | rtems_rtl_obj_free (obj); |
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465 | rtems_rtl_obj_caches_flush (); |
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466 | return NULL; |
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467 | } |
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468 | |
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469 | rtems_chain_append (&rtl->objects, &obj->link); |
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470 | |
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471 | if (!rtems_rtl_obj_load (obj)) |
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472 | { |
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473 | rtems_rtl_obj_free (obj); |
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474 | rtems_rtl_obj_caches_flush (); |
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475 | return NULL; |
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476 | } |
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477 | |
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478 | rtems_rtl_obj_caches_flush (); |
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479 | |
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480 | rtems_rtl_unresolved_resolve (); |
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481 | } |
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482 | |
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483 | /* |
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484 | * Increase the number of users. |
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485 | */ |
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486 | ++obj->users; |
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487 | |
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488 | /* |
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489 | * FIXME: Resolving existing unresolved symbols could add more constructors |
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490 | * lists that need to be called. Make a list in the obj load layer and |
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491 | * invoke the list here. |
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492 | */ |
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493 | |
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494 | /* |
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495 | * Run any local constructors if this is the first user because the object |
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496 | * file will have just been loaded. Unlock the linker to avoid any dead locks |
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497 | * if the object file needs to load files or update the symbol table. We also |
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498 | * do not want a constructor to unload this object file. |
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499 | */ |
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500 | if (obj->users == 1) |
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501 | { |
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502 | obj->flags |= RTEMS_RTL_OBJ_LOCKED; |
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503 | rtems_rtl_unlock (); |
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504 | rtems_rtl_obj_run_ctors (obj); |
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505 | rtems_rtl_lock (); |
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506 | obj->flags &= ~RTEMS_RTL_OBJ_LOCKED; |
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507 | } |
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508 | |
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509 | return obj; |
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510 | } |
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511 | |
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512 | bool |
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513 | rtems_rtl_unload_object (rtems_rtl_obj_t* obj) |
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514 | { |
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515 | bool ok = true; |
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516 | |
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517 | if (rtems_rtl_trace (RTEMS_RTL_TRACE_UNLOAD)) |
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518 | printf ("rtl: unloading '%s'\n", rtems_rtl_obj_fname (obj)); |
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519 | |
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520 | /* |
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521 | * If the object is locked it cannot be unloaded and the unload fails. |
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522 | */ |
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523 | if ((obj->flags & RTEMS_RTL_OBJ_LOCKED) == RTEMS_RTL_OBJ_LOCKED) |
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524 | { |
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525 | rtems_rtl_set_error (EINVAL, "cannot unload when locked"); |
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526 | return false; |
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527 | } |
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528 | |
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529 | /* |
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530 | * Check the number of users in a safe manner. If this is the last user unload the |
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531 | * object file from memory. |
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532 | */ |
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533 | if (obj->users > 0) |
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534 | --obj->users; |
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535 | |
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536 | if (obj->users == 0) |
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537 | { |
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538 | obj->flags |= RTEMS_RTL_OBJ_LOCKED; |
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539 | rtems_rtl_unlock (); |
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540 | rtems_rtl_obj_run_dtors (obj); |
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541 | rtems_rtl_lock (); |
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542 | obj->flags &= ~RTEMS_RTL_OBJ_LOCKED; |
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543 | |
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544 | ok = rtems_rtl_obj_unload (obj); |
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545 | |
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546 | rtems_rtl_obj_free (obj); |
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547 | rtems_rtl_obj_caches_flush (); |
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548 | } |
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549 | |
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550 | return ok; |
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551 | } |
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552 | |
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553 | void |
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554 | rtems_rtl_run_ctors (rtems_rtl_obj_t* obj) |
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555 | { |
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556 | rtems_rtl_obj_run_ctors (obj); |
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557 | } |
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558 | |
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559 | static bool |
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560 | rtems_rtl_path_update (bool prepend, const char* path) |
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561 | { |
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562 | char* paths; |
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563 | const char* src = NULL; |
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564 | char* dst; |
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565 | int len; |
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566 | |
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567 | if (!rtems_rtl_lock ()) |
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568 | return false; |
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569 | |
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570 | len = strlen (path); |
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571 | |
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572 | if (rtl->paths) |
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573 | len += strlen (rtl->paths) + 1; |
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574 | else |
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575 | prepend = true; |
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576 | |
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577 | paths = rtems_rtl_alloc_new (RTEMS_RTL_ALLOC_OBJECT, len + 1, false); |
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578 | |
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579 | if (!paths) |
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580 | { |
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581 | rtems_rtl_unlock (); |
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582 | return false; |
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583 | } |
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584 | |
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585 | dst = paths; |
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586 | |
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587 | if (prepend) |
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588 | { |
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589 | len = strlen (path); |
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590 | src = path; |
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591 | } |
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592 | else if (rtl->paths) |
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593 | { |
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594 | len = strlen (rtl->paths); |
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595 | src = rtl->paths; |
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596 | } |
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597 | |
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598 | memcpy (dst, src, len); |
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599 | |
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600 | dst += len; |
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601 | |
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602 | if (rtl->paths) |
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603 | { |
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604 | *dst = ':'; |
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605 | ++dst; |
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606 | } |
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607 | |
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608 | if (prepend) |
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609 | { |
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610 | src = rtl->paths; |
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611 | if (src) |
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612 | len = strlen (src); |
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613 | } |
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614 | else |
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615 | { |
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616 | len = strlen (path); |
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617 | src = path; |
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618 | } |
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619 | |
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620 | if (src) |
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621 | { |
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622 | memcpy (dst, src, len); |
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623 | dst += len; |
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624 | } |
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625 | |
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626 | *dst = '\0'; |
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627 | |
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628 | rtl->paths = paths; |
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629 | |
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630 | rtems_rtl_unlock (); |
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631 | return false; |
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632 | } |
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633 | |
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634 | bool |
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635 | rtems_rtl_path_append (const char* path) |
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636 | { |
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637 | return rtems_rtl_path_update (false, path); |
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638 | } |
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639 | |
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640 | bool |
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641 | rtems_rtl_path_prepend (const char* path) |
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642 | { |
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643 | return rtems_rtl_path_update (true, path); |
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644 | } |
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645 | |
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646 | void |
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647 | rtems_rtl_base_sym_global_add (const unsigned char* esyms, |
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648 | unsigned int size) |
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649 | { |
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650 | if (rtems_rtl_trace (RTEMS_RTL_TRACE_GLOBAL_SYM)) |
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651 | printf ("rtl: adding global symbols, table size %u\n", size); |
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652 | |
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653 | if (!rtems_rtl_lock ()) |
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654 | { |
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655 | rtems_rtl_set_error (EINVAL, "global add cannot lock rtl"); |
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656 | return; |
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657 | } |
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658 | |
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659 | rtems_rtl_symbol_global_add (rtl->base, esyms, size); |
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660 | |
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661 | rtems_rtl_unlock (); |
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662 | } |
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663 | |
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664 | rtems_rtl_obj_t* |
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665 | rtems_rtl_baseimage (void) |
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666 | { |
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667 | return NULL; |
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668 | } |
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