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