1 | /* |
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2 | * COPYRIGHT (c) 2012-2018 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 <errno.h> |
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23 | #include <fcntl.h> |
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24 | #include <inttypes.h> |
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25 | #include <stdlib.h> |
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26 | #include <string.h> |
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27 | #include <stdio.h> |
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28 | #include <unistd.h> |
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29 | |
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30 | #include <rtems/rtl/rtl.h> |
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31 | #include "rtl-elf.h" |
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32 | #include "rtl-error.h" |
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33 | #include <rtems/rtl/rtl-trace.h> |
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34 | #include "rtl-unwind.h" |
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35 | #include <rtems/rtl/rtl-unresolved.h> |
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36 | |
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37 | /** |
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38 | * The offsets in the unresolved array. |
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39 | */ |
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40 | #define REL_R_OFFSET (0) |
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41 | #define REL_R_INFO (1) |
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42 | #define REL_R_ADDEND (2) |
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43 | |
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44 | /** |
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45 | * The ELF format signature. |
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46 | */ |
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47 | static rtems_rtl_loader_format elf_sig = |
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48 | { |
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49 | .label = "ELF", |
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50 | .flags = RTEMS_RTL_FMT_ELF |
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51 | }; |
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52 | |
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53 | static bool |
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54 | rtems_rtl_elf_machine_check (Elf_Ehdr* ehdr) |
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55 | { |
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56 | /* |
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57 | * This code is determined by the NetBSD machine headers. |
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58 | */ |
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59 | switch (ehdr->e_machine) |
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60 | { |
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61 | ELFDEFNNAME (MACHDEP_ID_CASES) |
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62 | default: |
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63 | return false; |
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64 | } |
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65 | return true; |
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66 | } |
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67 | |
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68 | static const char* |
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69 | rtems_rtl_elf_separated_section (const char* name) |
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70 | { |
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71 | struct { |
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72 | const char* label; |
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73 | size_t len; |
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74 | } prefix[] = { |
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75 | #define SEPARATED_PREFIX(_p) { _p, sizeof (_p) - 1 } |
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76 | SEPARATED_PREFIX (".text."), |
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77 | SEPARATED_PREFIX (".rel.text."), |
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78 | SEPARATED_PREFIX (".data."), |
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79 | SEPARATED_PREFIX (".rel.data."), |
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80 | SEPARATED_PREFIX (".rodata."), |
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81 | SEPARATED_PREFIX (".rel.rodata.") |
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82 | }; |
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83 | const size_t prefixes = sizeof (prefix) / sizeof (prefix[0]); |
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84 | size_t p; |
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85 | for (p = 0; p < prefixes; ++p) |
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86 | { |
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87 | if (strncmp (name, prefix[p].label, prefix[p].len) == 0) |
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88 | return name + prefix[p].len; |
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89 | } |
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90 | return NULL; |
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91 | } |
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92 | |
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93 | static bool |
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94 | rtems_rtl_elf_find_symbol (rtems_rtl_obj* obj, |
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95 | const Elf_Sym* sym, |
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96 | const char* symname, |
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97 | rtems_rtl_obj_sym** symbol, |
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98 | Elf_Word* value) |
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99 | { |
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100 | rtems_rtl_obj_sect* sect; |
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101 | |
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102 | /* |
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103 | * If the symbol type is STT_NOTYPE the symbol references a global |
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104 | * symbol. The gobal symbol table is searched to find it and that value |
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105 | * returned. If the symbol is local to the object module the section for the |
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106 | * symbol is located and it's base added to the symbol's value giving an |
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107 | * absolute location. |
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108 | */ |
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109 | if (ELF_ST_TYPE(sym->st_info) == STT_NOTYPE || sym->st_shndx == SHN_COMMON) |
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110 | { |
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111 | /* |
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112 | * Search the object file then the global table for the symbol. |
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113 | */ |
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114 | *symbol = rtems_rtl_symbol_obj_find (obj, symname); |
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115 | if (!*symbol) |
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116 | return false; |
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117 | |
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118 | *value = (Elf_Addr) (*symbol)->value; |
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119 | return true; |
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120 | } |
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121 | |
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122 | *symbol = NULL; |
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123 | |
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124 | sect = rtems_rtl_obj_find_section_by_index (obj, sym->st_shndx); |
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125 | if (!sect) |
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126 | return false; |
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127 | |
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128 | *value = sym->st_value + (Elf_Addr) sect->base; |
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129 | |
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130 | return true; |
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131 | } |
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132 | |
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133 | /** |
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134 | * Relocation worker routine. |
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135 | */ |
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136 | typedef bool (*rtems_rtl_elf_reloc_handler)(rtems_rtl_obj* obj, |
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137 | bool is_rela, |
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138 | void* relbuf, |
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139 | rtems_rtl_obj_sect* targetsect, |
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140 | rtems_rtl_obj_sym* symbol, |
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141 | Elf_Sym* sym, |
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142 | const char* symname, |
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143 | Elf_Word symvalue, |
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144 | bool resolved, |
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145 | void* data); |
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146 | |
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147 | /** |
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148 | * Relocation parser data. |
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149 | */ |
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150 | typedef struct |
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151 | { |
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152 | size_t dependents; /**< The number of dependent object files. */ |
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153 | size_t unresolved; /**< The number of unresolved symbols. */ |
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154 | } rtems_rtl_elf_reloc_data; |
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155 | |
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156 | static bool |
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157 | rtems_rtl_elf_reloc_parser (rtems_rtl_obj* obj, |
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158 | bool is_rela, |
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159 | void* relbuf, |
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160 | rtems_rtl_obj_sect* targetsect, |
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161 | rtems_rtl_obj_sym* symbol, |
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162 | Elf_Sym* sym, |
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163 | const char* symname, |
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164 | Elf_Word symvalue, |
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165 | bool resolved, |
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166 | void* data) |
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167 | { |
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168 | rtems_rtl_elf_reloc_data* rd = (rtems_rtl_elf_reloc_data*) data; |
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169 | |
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170 | /* |
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171 | * The symbol has to have been resolved to parse the reloc record. Unresolved |
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172 | * symbols are handled in the relocator but we need to count them here so a |
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173 | * trampoline is accounted for. We have to assume the unresolved may be out of |
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174 | * of range. |
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175 | */ |
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176 | if (!resolved) |
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177 | { |
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178 | ++rd->unresolved; |
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179 | } |
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180 | else |
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181 | { |
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182 | /* |
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183 | * Check the reloc record to see if a trampoline is needed. |
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184 | */ |
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185 | if (is_rela) |
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186 | { |
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187 | const Elf_Rela* rela = (const Elf_Rela*) relbuf; |
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188 | if (rtems_rtl_trace (RTEMS_RTL_TRACE_RELOC)) |
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189 | printf ("rtl: rela tramp: sym:%s(%d)=%08jx type:%d off:%08jx addend:%d\n", |
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190 | symname, (int) ELF_R_SYM (rela->r_info), |
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191 | (uintmax_t) symvalue, (int) ELF_R_TYPE (rela->r_info), |
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192 | (uintmax_t) rela->r_offset, (int) rela->r_addend); |
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193 | if (!rtems_rtl_elf_relocate_rela_tramp (obj, rela, targetsect, |
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194 | symname, sym->st_info, symvalue)) |
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195 | return false; |
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196 | } |
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197 | else |
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198 | { |
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199 | const Elf_Rel* rel = (const Elf_Rel*) relbuf; |
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200 | if (rtems_rtl_trace (RTEMS_RTL_TRACE_RELOC)) |
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201 | printf ("rtl: rel tramp: sym:%s(%d)=%08jx type:%d off:%08jx\n", |
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202 | symname, (int) ELF_R_SYM (rel->r_info), |
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203 | (uintmax_t) symvalue, (int) ELF_R_TYPE (rel->r_info), |
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204 | (uintmax_t) rel->r_offset); |
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205 | if (!rtems_rtl_elf_relocate_rel_tramp (obj, rel, targetsect, |
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206 | symname, sym->st_info, symvalue)) |
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207 | return false; |
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208 | } |
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209 | |
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210 | if (symname != NULL) |
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211 | { |
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212 | /* |
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213 | * Find the symbol's object file. It cannot be NULL so ignore that result |
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214 | * if returned, it means something is corrupted. We are in an iterator. |
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215 | */ |
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216 | rtems_rtl_obj* sobj = rtems_rtl_find_obj_with_symbol (symbol); |
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217 | if (sobj != NULL) |
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218 | { |
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219 | /* |
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220 | * A dependency is not the base kernel image or itself. Tag the object as |
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221 | * having been visited so we count it only once. |
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222 | */ |
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223 | if (sobj != rtems_rtl_baseimage () && obj != sobj && |
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224 | (sobj->flags & RTEMS_RTL_OBJ_RELOC_TAG) == 0) |
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225 | { |
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226 | sobj->flags |= RTEMS_RTL_OBJ_RELOC_TAG; |
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227 | ++rd->dependents; |
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228 | } |
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229 | } |
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230 | } |
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231 | } |
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232 | |
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233 | return true; |
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234 | } |
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235 | |
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236 | static bool |
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237 | rtems_rtl_elf_reloc_relocator (rtems_rtl_obj* obj, |
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238 | bool is_rela, |
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239 | void* relbuf, |
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240 | rtems_rtl_obj_sect* targetsect, |
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241 | rtems_rtl_obj_sym* symbol, |
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242 | Elf_Sym* sym, |
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243 | const char* symname, |
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244 | Elf_Word symvalue, |
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245 | bool resolved, |
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246 | void* data) |
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247 | { |
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248 | const Elf_Rela* rela = (const Elf_Rela*) relbuf; |
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249 | const Elf_Rel* rel = (const Elf_Rel*) relbuf; |
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250 | |
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251 | if (!resolved) |
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252 | { |
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253 | uint16_t flags = 0; |
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254 | rtems_rtl_word rel_words[3]; |
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255 | |
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256 | if (is_rela) |
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257 | { |
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258 | flags = 1; |
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259 | rel_words[REL_R_OFFSET] = rela->r_offset; |
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260 | rel_words[REL_R_INFO] = rela->r_info; |
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261 | rel_words[REL_R_ADDEND] = rela->r_addend; |
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262 | } |
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263 | else |
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264 | { |
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265 | rel_words[REL_R_OFFSET] = rel->r_offset; |
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266 | rel_words[REL_R_INFO] = rel->r_info; |
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267 | rel_words[REL_R_ADDEND] = 0; |
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268 | } |
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269 | |
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270 | if (!rtems_rtl_unresolved_add (obj, |
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271 | flags, |
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272 | symname, |
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273 | targetsect->section, |
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274 | rel_words)) |
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275 | return false; |
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276 | |
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277 | ++obj->unresolved; |
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278 | } |
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279 | else |
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280 | { |
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281 | rtems_rtl_obj* sobj; |
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282 | |
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283 | if (is_rela) |
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284 | { |
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285 | if (rtems_rtl_trace (RTEMS_RTL_TRACE_RELOC)) |
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286 | printf ("rtl: rela: sym:%s(%d)=%08jx type:%d off:%08jx addend:%d\n", |
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287 | symname, (int) ELF_R_SYM (rela->r_info), |
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288 | (uintmax_t) symvalue, (int) ELF_R_TYPE (rela->r_info), |
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289 | (uintmax_t) rela->r_offset, (int) rela->r_addend); |
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290 | if (!rtems_rtl_elf_relocate_rela (obj, rela, targetsect, |
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291 | symname, sym->st_info, symvalue)) |
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292 | return false; |
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293 | } |
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294 | else |
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295 | { |
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296 | if (rtems_rtl_trace (RTEMS_RTL_TRACE_RELOC)) |
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297 | printf ("rtl: rel: sym:%s(%d)=%08jx type:%d off:%08jx\n", |
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298 | symname, (int) ELF_R_SYM (rel->r_info), |
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299 | (uintmax_t) symvalue, (int) ELF_R_TYPE (rel->r_info), |
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300 | (uintmax_t) rel->r_offset); |
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301 | if (!rtems_rtl_elf_relocate_rel (obj, rel, targetsect, |
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302 | symname, sym->st_info, symvalue)) |
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303 | return false; |
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304 | } |
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305 | |
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306 | sobj = rtems_rtl_find_obj_with_symbol (symbol); |
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307 | |
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308 | if (rtems_rtl_trace (RTEMS_RTL_TRACE_DEPENDENCY)) |
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309 | printf ("rtl: depend: %s -> %s:%s\n", |
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310 | obj->oname, |
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311 | sobj == NULL ? "not-found" : sobj->oname, |
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312 | symname); |
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313 | |
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314 | if (sobj != NULL) |
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315 | { |
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316 | if (rtems_rtl_obj_add_dependent (obj, sobj)) |
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317 | rtems_rtl_obj_inc_reference (sobj); |
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318 | } |
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319 | } |
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320 | |
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321 | return true; |
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322 | } |
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323 | |
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324 | static bool |
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325 | rtems_rtl_elf_relocate_worker (rtems_rtl_obj* obj, |
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326 | int fd, |
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327 | rtems_rtl_obj_sect* sect, |
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328 | rtems_rtl_elf_reloc_handler handler, |
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329 | void* data) |
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330 | { |
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331 | rtems_rtl_obj_cache* symbols; |
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332 | rtems_rtl_obj_cache* strings; |
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333 | rtems_rtl_obj_cache* relocs; |
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334 | rtems_rtl_obj_sect* targetsect; |
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335 | rtems_rtl_obj_sect* symsect; |
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336 | rtems_rtl_obj_sect* strtab; |
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337 | bool is_rela; |
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338 | size_t reloc_size; |
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339 | int reloc; |
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340 | |
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341 | /* |
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342 | * First check if the section the relocations are for exists. If it does not |
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343 | * exist ignore these relocations. They are most probably debug sections. |
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344 | */ |
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345 | targetsect = rtems_rtl_obj_find_section_by_index (obj, sect->info); |
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346 | if (!targetsect) |
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347 | return true; |
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348 | |
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349 | /* |
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350 | * The section muct has been loaded. It could be a separate section in an |
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351 | * archive and not loaded. |
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352 | */ |
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353 | if ((targetsect->flags & RTEMS_RTL_OBJ_SECT_LOAD) == 0) |
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354 | return true; |
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355 | |
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356 | |
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357 | rtems_rtl_obj_caches (&symbols, &strings, &relocs); |
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358 | |
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359 | if (!symbols || !strings || !relocs) |
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360 | return false; |
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361 | |
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362 | symsect = rtems_rtl_obj_find_section (obj, ".symtab"); |
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363 | if (!symsect) |
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364 | { |
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365 | rtems_rtl_set_error (EINVAL, "no .symtab section"); |
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366 | return false; |
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367 | } |
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368 | |
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369 | strtab = rtems_rtl_obj_find_section (obj, ".strtab"); |
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370 | if (!strtab) |
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371 | { |
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372 | rtems_rtl_set_error (EINVAL, "no .strtab section"); |
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373 | return false; |
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374 | } |
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375 | |
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376 | if (rtems_rtl_trace (RTEMS_RTL_TRACE_RELOC)) |
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377 | printf ("rtl: relocation: %s, syms:%s\n", sect->name, symsect->name); |
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378 | |
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379 | /* |
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380 | * Handle the different relocation record types. |
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381 | */ |
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382 | is_rela = ((sect->flags & RTEMS_RTL_OBJ_SECT_RELA) == |
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383 | RTEMS_RTL_OBJ_SECT_RELA) ? true : false; |
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384 | reloc_size = is_rela ? sizeof (Elf_Rela) : sizeof (Elf_Rel); |
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385 | |
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386 | for (reloc = 0; reloc < (sect->size / reloc_size); ++reloc) |
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387 | { |
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388 | uint8_t relbuf[reloc_size]; |
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389 | const Elf_Rela* rela = (const Elf_Rela*) relbuf; |
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390 | const Elf_Rel* rel = (const Elf_Rel*) relbuf; |
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391 | rtems_rtl_obj_sym* symbol = NULL; |
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392 | Elf_Sym sym; |
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393 | const char* symname = NULL; |
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394 | off_t off; |
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395 | Elf_Word rel_type; |
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396 | Elf_Word symvalue = 0; |
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397 | bool resolved; |
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398 | |
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399 | off = obj->ooffset + sect->offset + (reloc * reloc_size); |
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400 | |
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401 | if (!rtems_rtl_obj_cache_read_byval (relocs, fd, off, |
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402 | &relbuf[0], reloc_size)) |
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403 | return false; |
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404 | |
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405 | /* |
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406 | * Read the symbol details. |
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407 | */ |
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408 | if (is_rela) |
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409 | off = (obj->ooffset + symsect->offset + |
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410 | (ELF_R_SYM (rela->r_info) * sizeof (sym))); |
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411 | else |
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412 | off = (obj->ooffset + symsect->offset + |
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413 | (ELF_R_SYM (rel->r_info) * sizeof (sym))); |
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414 | |
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415 | if (!rtems_rtl_obj_cache_read_byval (symbols, fd, off, |
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416 | &sym, sizeof (sym))) |
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417 | return false; |
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418 | |
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419 | /* |
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420 | * Only need the name of the symbol if global or a common symbol. |
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421 | */ |
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422 | if (ELF_ST_TYPE (sym.st_info) == STT_NOTYPE || |
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423 | ELF_ST_TYPE (sym.st_info) == STT_TLS || |
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424 | sym.st_shndx == SHN_COMMON) |
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425 | { |
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426 | size_t len; |
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427 | off = obj->ooffset + strtab->offset + sym.st_name; |
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428 | len = RTEMS_RTL_ELF_STRING_MAX; |
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429 | |
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430 | if (!rtems_rtl_obj_cache_read (strings, fd, off, |
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431 | (void**) &symname, &len)) |
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432 | return false; |
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433 | } |
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434 | |
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435 | /* |
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436 | * See if the record references an external symbol. If it does find the |
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437 | * symbol value. If the symbol cannot be found flag the object file as |
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438 | * having unresolved externals and store the external. The load of an |
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439 | * object after this one may provide the unresolved externals. |
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440 | */ |
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441 | if (is_rela) |
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442 | rel_type = ELF_R_TYPE(rela->r_info); |
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443 | else |
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444 | rel_type = ELF_R_TYPE(rel->r_info); |
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445 | |
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446 | resolved = true; |
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447 | |
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448 | if (rtems_rtl_elf_rel_resolve_sym (rel_type)) |
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449 | resolved = rtems_rtl_elf_find_symbol (obj, |
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450 | &sym, symname, |
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451 | &symbol, &symvalue); |
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452 | |
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453 | if (!handler (obj, |
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454 | is_rela, relbuf, targetsect, |
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455 | symbol, &sym, symname, symvalue, resolved, |
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456 | data)) |
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457 | return false; |
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458 | } |
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459 | |
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460 | /* |
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461 | * Set the unresolved externals status if there are unresolved externals. |
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462 | */ |
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463 | if (obj->unresolved) |
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464 | obj->flags |= RTEMS_RTL_OBJ_UNRESOLVED; |
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465 | |
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466 | return true; |
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467 | } |
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468 | |
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469 | static bool |
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470 | rtems_rtl_elf_relocs_parser (rtems_rtl_obj* obj, |
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471 | int fd, |
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472 | rtems_rtl_obj_sect* sect, |
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473 | void* data) |
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474 | { |
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475 | bool r = rtems_rtl_elf_relocate_worker (obj, fd, sect, |
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476 | rtems_rtl_elf_reloc_parser, data); |
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477 | return r; |
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478 | } |
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479 | |
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480 | static bool |
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481 | rtems_rtl_elf_relocs_locator (rtems_rtl_obj* obj, |
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482 | int fd, |
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483 | rtems_rtl_obj_sect* sect, |
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484 | void* data) |
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485 | { |
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486 | return rtems_rtl_elf_relocate_worker (obj, fd, sect, |
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487 | rtems_rtl_elf_reloc_relocator, data); |
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488 | } |
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489 | |
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490 | bool |
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491 | rtems_rtl_obj_relocate_unresolved (rtems_rtl_unresolv_reloc* reloc, |
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492 | rtems_rtl_obj_sym* sym) |
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493 | { |
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494 | rtems_rtl_obj_sect* sect; |
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495 | bool is_rela; |
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496 | Elf_Word symvalue; |
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497 | rtems_rtl_obj* sobj; |
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498 | |
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499 | is_rela = reloc->flags & 1; |
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500 | |
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501 | sect = rtems_rtl_obj_find_section_by_index (reloc->obj, reloc->sect); |
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502 | if (!sect) |
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503 | { |
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504 | rtems_rtl_set_error (ENOEXEC, "unresolved sect not found"); |
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505 | return false; |
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506 | } |
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507 | |
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508 | symvalue = (Elf_Word) (intptr_t) sym->value; |
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509 | if (is_rela) |
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510 | { |
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511 | Elf_Rela rela; |
---|
512 | rela.r_offset = reloc->rel[REL_R_OFFSET]; |
---|
513 | rela.r_info = reloc->rel[REL_R_INFO]; |
---|
514 | rela.r_addend = reloc->rel[REL_R_ADDEND]; |
---|
515 | if (rtems_rtl_trace (RTEMS_RTL_TRACE_RELOC)) |
---|
516 | printf ("rtl: rela: sym:%d type:%d off:%08jx addend:%d\n", |
---|
517 | (int) ELF_R_SYM (rela.r_info), (int) ELF_R_TYPE (rela.r_info), |
---|
518 | (uintmax_t) rela.r_offset, (int) rela.r_addend); |
---|
519 | if (!rtems_rtl_elf_relocate_rela (reloc->obj, &rela, sect, |
---|
520 | sym->name, sym->data, symvalue)) |
---|
521 | return false; |
---|
522 | } |
---|
523 | else |
---|
524 | { |
---|
525 | Elf_Rel rel; |
---|
526 | rel.r_offset = reloc->rel[REL_R_OFFSET]; |
---|
527 | rel.r_info = reloc->rel[REL_R_INFO]; |
---|
528 | if (rtems_rtl_trace (RTEMS_RTL_TRACE_RELOC)) |
---|
529 | printf ("rtl: rel: sym:%d type:%d off:%08jx\n", |
---|
530 | (int) ELF_R_SYM (rel.r_info), (int) ELF_R_TYPE (rel.r_info), |
---|
531 | (uintmax_t) rel.r_offset); |
---|
532 | if (!rtems_rtl_elf_relocate_rel (reloc->obj, &rel, sect, |
---|
533 | sym->name, sym->data, symvalue)) |
---|
534 | return false; |
---|
535 | } |
---|
536 | |
---|
537 | if (reloc->obj->unresolved > 0) |
---|
538 | { |
---|
539 | --reloc->obj->unresolved; |
---|
540 | if (reloc->obj->unresolved == 0) |
---|
541 | reloc->obj->flags &= ~RTEMS_RTL_OBJ_UNRESOLVED; |
---|
542 | } |
---|
543 | |
---|
544 | sobj = rtems_rtl_find_obj_with_symbol (sym); |
---|
545 | |
---|
546 | if (rtems_rtl_trace (RTEMS_RTL_TRACE_DEPENDENCY)) |
---|
547 | printf ("rtl: depend: %s -> %s:%s\n", |
---|
548 | reloc->obj->oname, |
---|
549 | sobj == NULL ? "not-found" : sobj->oname, |
---|
550 | sym->name); |
---|
551 | |
---|
552 | if (sobj != NULL) |
---|
553 | { |
---|
554 | if (rtems_rtl_obj_add_dependent (reloc->obj, sobj)) |
---|
555 | rtems_rtl_obj_inc_reference (sobj); |
---|
556 | } |
---|
557 | |
---|
558 | return true; |
---|
559 | } |
---|
560 | |
---|
561 | /** |
---|
562 | * Common symbol iterator data. |
---|
563 | */ |
---|
564 | typedef struct |
---|
565 | { |
---|
566 | size_t size; /**< The size of the common section */ |
---|
567 | uint32_t alignment; /**< The alignment of the common section. */ |
---|
568 | } rtems_rtl_elf_common_data; |
---|
569 | |
---|
570 | static bool |
---|
571 | rtems_rtl_elf_common (rtems_rtl_obj* obj, |
---|
572 | int fd, |
---|
573 | rtems_rtl_obj_sect* sect, |
---|
574 | void* data) |
---|
575 | { |
---|
576 | rtems_rtl_elf_common_data* common = (rtems_rtl_elf_common_data*) data; |
---|
577 | rtems_rtl_obj_cache* symbols; |
---|
578 | int sym; |
---|
579 | |
---|
580 | rtems_rtl_obj_caches (&symbols, NULL, NULL); |
---|
581 | |
---|
582 | if (!symbols) |
---|
583 | return false; |
---|
584 | |
---|
585 | /* |
---|
586 | * Find the number size of the common section by finding all symbols that |
---|
587 | * reference the SHN_COMMON section. |
---|
588 | */ |
---|
589 | for (sym = 0; sym < (sect->size / sizeof (Elf_Sym)); ++sym) |
---|
590 | { |
---|
591 | Elf_Sym symbol; |
---|
592 | off_t off; |
---|
593 | |
---|
594 | off = obj->ooffset + sect->offset + (sym * sizeof (symbol)); |
---|
595 | |
---|
596 | if (!rtems_rtl_obj_cache_read_byval (symbols, fd, off, |
---|
597 | &symbol, sizeof (symbol))) |
---|
598 | return false; |
---|
599 | |
---|
600 | if ((symbol.st_shndx == SHN_COMMON) && |
---|
601 | ((ELF_ST_TYPE (symbol.st_info) == STT_OBJECT) || |
---|
602 | (ELF_ST_TYPE (symbol.st_info) == STT_COMMON))) |
---|
603 | { |
---|
604 | if (rtems_rtl_trace (RTEMS_RTL_TRACE_SYMBOL)) |
---|
605 | printf ("rtl: com:elf:%-2d bind:%-2d type:%-2d size:%d value:%d name:%d\n", |
---|
606 | sym, (int) ELF_ST_BIND (symbol.st_info), |
---|
607 | (int) ELF_ST_TYPE (symbol.st_info), |
---|
608 | (int) symbol.st_size, (int) symbol.st_value, |
---|
609 | (int) symbol.st_name); |
---|
610 | /* |
---|
611 | * If the size is zero this is the first entry, it defines the common |
---|
612 | * section's aligment. The symbol's value is the alignment. |
---|
613 | */ |
---|
614 | if (common->size == 0) |
---|
615 | common->alignment = symbol.st_value; |
---|
616 | common->size += |
---|
617 | rtems_rtl_obj_align (common->size, symbol.st_value) + symbol.st_size; |
---|
618 | } |
---|
619 | } |
---|
620 | |
---|
621 | return true; |
---|
622 | } |
---|
623 | |
---|
624 | static bool |
---|
625 | rtems_rtl_elf_alloc_trampoline (rtems_rtl_obj* obj, size_t unresolved) |
---|
626 | { |
---|
627 | /* |
---|
628 | * Add on enough space to handle the unresolved externals that need to be |
---|
629 | * resolved at some point in time. They could all require fixups and |
---|
630 | * trampolines. |
---|
631 | */ |
---|
632 | obj->tramp_size += |
---|
633 | rtems_rtl_elf_relocate_tramp_max_size () * unresolved; |
---|
634 | return rtems_rtl_obj_alloc_trampoline (obj); |
---|
635 | } |
---|
636 | |
---|
637 | static bool |
---|
638 | rtems_rtl_elf_dependents (rtems_rtl_obj* obj, rtems_rtl_elf_reloc_data* reloc) |
---|
639 | { |
---|
640 | /* |
---|
641 | * If there are dependencies and no unresolved externals allocate and size |
---|
642 | * the dependency table to the number of dependent object files. If there are |
---|
643 | * unresolved externals the number of dependencies is unknown at this point |
---|
644 | * in time so use dynamic allocation to allocate the block size number of |
---|
645 | * entries when the entries are added. |
---|
646 | */ |
---|
647 | if (reloc->dependents > 0 && reloc->unresolved == 0) |
---|
648 | { |
---|
649 | if (!rtems_rtl_obj_alloc_dependents (obj, reloc->dependents)) |
---|
650 | return false; |
---|
651 | } |
---|
652 | return true; |
---|
653 | } |
---|
654 | |
---|
655 | static bool |
---|
656 | rtems_rtl_elf_symbols (rtems_rtl_obj* obj, |
---|
657 | int fd, |
---|
658 | rtems_rtl_obj_sect* sect, |
---|
659 | void* data) |
---|
660 | { |
---|
661 | rtems_rtl_obj_cache* symbols; |
---|
662 | rtems_rtl_obj_cache* strings; |
---|
663 | rtems_rtl_obj_sect* strtab; |
---|
664 | int locals; |
---|
665 | int local_string_space; |
---|
666 | rtems_rtl_obj_sym* lsym; |
---|
667 | char* lstring; |
---|
668 | int globals; |
---|
669 | int global_string_space; |
---|
670 | rtems_rtl_obj_sym* gsym; |
---|
671 | char* gstring; |
---|
672 | size_t common_offset; |
---|
673 | int sym; |
---|
674 | |
---|
675 | strtab = rtems_rtl_obj_find_section (obj, ".strtab"); |
---|
676 | if (!strtab) |
---|
677 | { |
---|
678 | rtems_rtl_set_error (EINVAL, "no .strtab section"); |
---|
679 | return false; |
---|
680 | } |
---|
681 | |
---|
682 | rtems_rtl_obj_caches (&symbols, &strings, NULL); |
---|
683 | |
---|
684 | if (!symbols || !strings) |
---|
685 | return false; |
---|
686 | |
---|
687 | /* |
---|
688 | * Find the number of globals and the amount of string space |
---|
689 | * needed. Also check for duplicate symbols. |
---|
690 | */ |
---|
691 | |
---|
692 | globals = 0; |
---|
693 | global_string_space = 0; |
---|
694 | locals = 0; |
---|
695 | local_string_space = 0; |
---|
696 | |
---|
697 | for (sym = 0; sym < (sect->size / sizeof (Elf_Sym)); ++sym) |
---|
698 | { |
---|
699 | Elf_Sym symbol; |
---|
700 | off_t off; |
---|
701 | const char* name; |
---|
702 | size_t len; |
---|
703 | |
---|
704 | off = obj->ooffset + sect->offset + (sym * sizeof (symbol)); |
---|
705 | |
---|
706 | if (!rtems_rtl_obj_cache_read_byval (symbols, fd, off, |
---|
707 | &symbol, sizeof (symbol))) |
---|
708 | return false; |
---|
709 | |
---|
710 | off = obj->ooffset + strtab->offset + symbol.st_name; |
---|
711 | len = RTEMS_RTL_ELF_STRING_MAX; |
---|
712 | |
---|
713 | if (!rtems_rtl_obj_cache_read (strings, fd, off, (void**) &name, &len)) |
---|
714 | return false; |
---|
715 | |
---|
716 | /* |
---|
717 | * Only keep the functions and global or weak symbols so place them in a |
---|
718 | * separate table to local symbols. Local symbols are not needed after the |
---|
719 | * object file has been loaded. Undefined symbols are NOTYPE so for locals |
---|
720 | * we need to make sure there is a valid seciton. |
---|
721 | */ |
---|
722 | if (rtems_rtl_trace (RTEMS_RTL_TRACE_SYMBOL)) |
---|
723 | printf ("rtl: sym:elf:%-2d name:%-2d:%-20s bind:%-2d " \ |
---|
724 | "type:%-2d sect:%d size:%d\n", |
---|
725 | sym, (int) symbol.st_name, name, |
---|
726 | (int) ELF_ST_BIND (symbol.st_info), |
---|
727 | (int) ELF_ST_TYPE (symbol.st_info), |
---|
728 | symbol.st_shndx, |
---|
729 | (int) symbol.st_size); |
---|
730 | |
---|
731 | /* |
---|
732 | * If a duplicate forget it. |
---|
733 | */ |
---|
734 | if (rtems_rtl_symbol_global_find (name)) |
---|
735 | continue; |
---|
736 | |
---|
737 | if ((symbol.st_shndx != 0) && |
---|
738 | ((ELF_ST_TYPE (symbol.st_info) == STT_OBJECT) || |
---|
739 | (ELF_ST_TYPE (symbol.st_info) == STT_COMMON) || |
---|
740 | (ELF_ST_TYPE (symbol.st_info) == STT_FUNC) || |
---|
741 | (ELF_ST_TYPE (symbol.st_info) == STT_NOTYPE))) |
---|
742 | { |
---|
743 | /* |
---|
744 | * There needs to be a valid section for the symbol. |
---|
745 | */ |
---|
746 | rtems_rtl_obj_sect* symsect; |
---|
747 | |
---|
748 | symsect = rtems_rtl_obj_find_section_by_index (obj, symbol.st_shndx); |
---|
749 | if (symsect != NULL) |
---|
750 | { |
---|
751 | if ((ELF_ST_BIND (symbol.st_info) == STB_GLOBAL) || |
---|
752 | (ELF_ST_BIND (symbol.st_info) == STB_WEAK)) |
---|
753 | { |
---|
754 | /* |
---|
755 | * If there is a globally exported symbol already present and this |
---|
756 | * symbol is not weak raise check if the object file being loaded is |
---|
757 | * from an archive. If the base image is built with text sections a |
---|
758 | * symbol with it's section will be linked into the base image and not |
---|
759 | * another symbol. If not an archive rause an error. |
---|
760 | * |
---|
761 | * If the symbol is weak and present globally ignore this symbol and |
---|
762 | * use the global one and if it is not present take this symbol global |
---|
763 | * or weak. We accept the first weak symbol we find and make it |
---|
764 | * globally exported. |
---|
765 | */ |
---|
766 | if (rtems_rtl_symbol_global_find (name) && |
---|
767 | (ELF_ST_BIND (symbol.st_info) != STB_WEAK)) |
---|
768 | { |
---|
769 | if (!rtems_rtl_obj_aname_valid (obj)) |
---|
770 | { |
---|
771 | rtems_rtl_set_error (ENOMEM, "duplicate global symbol: %s", name); |
---|
772 | return false; |
---|
773 | } |
---|
774 | } |
---|
775 | else |
---|
776 | { |
---|
777 | if (rtems_rtl_trace (RTEMS_RTL_TRACE_SYMBOL)) |
---|
778 | printf ("rtl: sym:elf:%-2d name:%-2d:%-20s: global\n", |
---|
779 | sym, (int) symbol.st_name, name); |
---|
780 | ++globals; |
---|
781 | global_string_space += strlen (name) + 1; |
---|
782 | } |
---|
783 | } |
---|
784 | else if (ELF_ST_BIND (symbol.st_info) == STB_LOCAL) |
---|
785 | { |
---|
786 | if (rtems_rtl_trace (RTEMS_RTL_TRACE_SYMBOL)) |
---|
787 | printf ("rtl: sym:elf:%-2d name:%-2d:%-20s: local\n", |
---|
788 | sym, (int) symbol.st_name, name); |
---|
789 | ++locals; |
---|
790 | local_string_space += strlen (name) + 1; |
---|
791 | } |
---|
792 | } |
---|
793 | } |
---|
794 | } |
---|
795 | |
---|
796 | if (locals) |
---|
797 | { |
---|
798 | obj->local_size = locals * sizeof (rtems_rtl_obj_sym) + local_string_space; |
---|
799 | obj->local_table = rtems_rtl_alloc_new (RTEMS_RTL_ALLOC_SYMBOL, |
---|
800 | obj->local_size, true); |
---|
801 | if (!obj->local_table) |
---|
802 | { |
---|
803 | obj->local_size = 0; |
---|
804 | rtems_rtl_set_error (ENOMEM, "no memory for obj local syms"); |
---|
805 | return false; |
---|
806 | } |
---|
807 | |
---|
808 | obj->local_syms = locals; |
---|
809 | } |
---|
810 | |
---|
811 | if (globals) |
---|
812 | { |
---|
813 | obj->global_size = globals * sizeof (rtems_rtl_obj_sym) + global_string_space; |
---|
814 | obj->global_table = rtems_rtl_alloc_new (RTEMS_RTL_ALLOC_SYMBOL, |
---|
815 | obj->global_size, true); |
---|
816 | if (!obj->global_table) |
---|
817 | { |
---|
818 | if (locals) |
---|
819 | { |
---|
820 | rtems_rtl_alloc_del (RTEMS_RTL_ALLOC_SYMBOL, obj->local_table); |
---|
821 | obj->local_size = 0; |
---|
822 | obj->local_syms = 0; |
---|
823 | } |
---|
824 | obj->global_size = 0; |
---|
825 | rtems_rtl_set_error (ENOMEM, "no memory for obj global syms"); |
---|
826 | return false; |
---|
827 | } |
---|
828 | |
---|
829 | obj->global_syms = globals; |
---|
830 | } |
---|
831 | |
---|
832 | lsym = obj->local_table; |
---|
833 | lstring = |
---|
834 | (((char*) obj->local_table) + (locals * sizeof (rtems_rtl_obj_sym))); |
---|
835 | gsym = obj->global_table; |
---|
836 | gstring = |
---|
837 | (((char*) obj->global_table) + (globals * sizeof (rtems_rtl_obj_sym))); |
---|
838 | |
---|
839 | common_offset = 0; |
---|
840 | |
---|
841 | for (sym = 0; sym < (sect->size / sizeof (Elf_Sym)); ++sym) |
---|
842 | { |
---|
843 | Elf_Sym symbol; |
---|
844 | off_t off; |
---|
845 | size_t len; |
---|
846 | |
---|
847 | off = obj->ooffset + sect->offset + (sym * sizeof (symbol)); |
---|
848 | |
---|
849 | if (!rtems_rtl_obj_cache_read_byval (symbols, fd, off, |
---|
850 | &symbol, sizeof (symbol))) |
---|
851 | { |
---|
852 | if (locals) |
---|
853 | { |
---|
854 | rtems_rtl_alloc_del (RTEMS_RTL_ALLOC_SYMBOL, obj->local_table); |
---|
855 | obj->local_table = NULL; |
---|
856 | obj->local_size = 0; |
---|
857 | obj->local_syms = 0; |
---|
858 | } |
---|
859 | if (globals) |
---|
860 | { |
---|
861 | rtems_rtl_alloc_del (RTEMS_RTL_ALLOC_SYMBOL, obj->global_table); |
---|
862 | obj->global_table = NULL; |
---|
863 | obj->global_syms = 0; |
---|
864 | obj->global_size = 0; |
---|
865 | } |
---|
866 | return false; |
---|
867 | } |
---|
868 | |
---|
869 | if ((symbol.st_shndx != 0) && |
---|
870 | ((ELF_ST_TYPE (symbol.st_info) == STT_OBJECT) || |
---|
871 | (ELF_ST_TYPE (symbol.st_info) == STT_COMMON) || |
---|
872 | (ELF_ST_TYPE (symbol.st_info) == STT_FUNC) || |
---|
873 | (ELF_ST_TYPE (symbol.st_info) == STT_NOTYPE)) && |
---|
874 | ((ELF_ST_BIND (symbol.st_info) == STB_GLOBAL) || |
---|
875 | (ELF_ST_BIND (symbol.st_info) == STB_WEAK) || |
---|
876 | (ELF_ST_BIND (symbol.st_info) == STB_LOCAL))) |
---|
877 | { |
---|
878 | rtems_rtl_obj_sect* symsect; |
---|
879 | rtems_rtl_obj_sym* osym; |
---|
880 | char* string; |
---|
881 | Elf_Word value; |
---|
882 | |
---|
883 | symsect = rtems_rtl_obj_find_section_by_index (obj, symbol.st_shndx); |
---|
884 | if (symsect) |
---|
885 | { |
---|
886 | const char* name; |
---|
887 | |
---|
888 | off = obj->ooffset + strtab->offset + symbol.st_name; |
---|
889 | len = RTEMS_RTL_ELF_STRING_MAX; |
---|
890 | |
---|
891 | if (!rtems_rtl_obj_cache_read (strings, fd, off, (void**) &name, &len)) |
---|
892 | return false; |
---|
893 | |
---|
894 | /* |
---|
895 | * If a duplicate forget it. |
---|
896 | */ |
---|
897 | if (rtems_rtl_symbol_global_find (name)) |
---|
898 | continue; |
---|
899 | |
---|
900 | if ((ELF_ST_BIND (symbol.st_info) == STB_GLOBAL) || |
---|
901 | (ELF_ST_BIND (symbol.st_info) == STB_WEAK)) |
---|
902 | { |
---|
903 | osym = gsym; |
---|
904 | string = gstring; |
---|
905 | gstring += strlen (name) + 1; |
---|
906 | ++gsym; |
---|
907 | } |
---|
908 | else |
---|
909 | { |
---|
910 | osym = lsym; |
---|
911 | string = lstring; |
---|
912 | lstring += strlen (name) + 1; |
---|
913 | ++lsym; |
---|
914 | } |
---|
915 | |
---|
916 | /* |
---|
917 | * Allocate any common symbols in the common section. |
---|
918 | */ |
---|
919 | if (symbol.st_shndx == SHN_COMMON) |
---|
920 | { |
---|
921 | size_t value_off = rtems_rtl_obj_align (common_offset, |
---|
922 | symbol.st_value); |
---|
923 | common_offset = value_off + symbol.st_size; |
---|
924 | value = value_off; |
---|
925 | } |
---|
926 | else |
---|
927 | { |
---|
928 | value = symbol.st_value; |
---|
929 | } |
---|
930 | |
---|
931 | rtems_chain_set_off_chain (&osym->node); |
---|
932 | memcpy (string, name, strlen (name) + 1); |
---|
933 | osym->name = string; |
---|
934 | osym->value = value + (uint8_t*) symsect->base; |
---|
935 | osym->data = symbol.st_info; |
---|
936 | |
---|
937 | if (rtems_rtl_trace (RTEMS_RTL_TRACE_SYMBOL)) |
---|
938 | printf ("rtl: sym:add:%-2d name:%-2d:%-20s bind:%-2d " \ |
---|
939 | "type:%-2d val:%8p sect:%d size:%d\n", |
---|
940 | sym, (int) symbol.st_name, osym->name, |
---|
941 | (int) ELF_ST_BIND (symbol.st_info), |
---|
942 | (int) ELF_ST_TYPE (symbol.st_info), |
---|
943 | osym->value, symbol.st_shndx, |
---|
944 | (int) symbol.st_size); |
---|
945 | } |
---|
946 | } |
---|
947 | } |
---|
948 | |
---|
949 | if (globals) |
---|
950 | rtems_rtl_symbol_obj_add (obj); |
---|
951 | |
---|
952 | return true; |
---|
953 | } |
---|
954 | |
---|
955 | static bool |
---|
956 | rtems_rtl_elf_arch_alloc (rtems_rtl_obj* obj, |
---|
957 | int fd, |
---|
958 | rtems_rtl_obj_sect* sect, |
---|
959 | void* data) |
---|
960 | { |
---|
961 | if (rtems_rtl_obj_sect_is_arch_alloc (sect)) |
---|
962 | return rtems_rtl_elf_arch_section_alloc (obj, sect); |
---|
963 | return true; |
---|
964 | } |
---|
965 | |
---|
966 | static bool |
---|
967 | rtems_rtl_elf_arch_free (rtems_rtl_obj* obj) |
---|
968 | { |
---|
969 | int index = -1; |
---|
970 | while (true) |
---|
971 | { |
---|
972 | rtems_rtl_obj_sect* sect; |
---|
973 | sect = rtems_rtl_obj_find_section_by_mask (obj, |
---|
974 | index, |
---|
975 | RTEMS_RTL_OBJ_SECT_ARCH_ALLOC); |
---|
976 | if (sect == NULL) |
---|
977 | break; |
---|
978 | if (!rtems_rtl_elf_arch_section_free (obj, sect)) |
---|
979 | return false; |
---|
980 | index = sect->section; |
---|
981 | } |
---|
982 | return true; |
---|
983 | } |
---|
984 | |
---|
985 | static bool |
---|
986 | rtems_rtl_elf_loader (rtems_rtl_obj* obj, |
---|
987 | int fd, |
---|
988 | rtems_rtl_obj_sect* sect, |
---|
989 | void* data) |
---|
990 | { |
---|
991 | uint8_t* base_offset; |
---|
992 | size_t len; |
---|
993 | |
---|
994 | if (lseek (fd, obj->ooffset + sect->offset, SEEK_SET) < 0) |
---|
995 | { |
---|
996 | rtems_rtl_set_error (errno, "section load seek failed"); |
---|
997 | return false; |
---|
998 | } |
---|
999 | |
---|
1000 | base_offset = sect->base; |
---|
1001 | len = sect->size; |
---|
1002 | |
---|
1003 | while (len) |
---|
1004 | { |
---|
1005 | ssize_t r = read (fd, base_offset, len); |
---|
1006 | if (r <= 0) |
---|
1007 | { |
---|
1008 | rtems_rtl_set_error (errno, "section load read failed"); |
---|
1009 | return false; |
---|
1010 | } |
---|
1011 | base_offset += r; |
---|
1012 | len -= r; |
---|
1013 | } |
---|
1014 | |
---|
1015 | return true; |
---|
1016 | } |
---|
1017 | |
---|
1018 | static bool |
---|
1019 | rtems_rtl_elf_parse_sections (rtems_rtl_obj* obj, int fd, Elf_Ehdr* ehdr) |
---|
1020 | { |
---|
1021 | rtems_rtl_obj_cache* sects; |
---|
1022 | rtems_rtl_obj_cache* strings; |
---|
1023 | int section; |
---|
1024 | off_t sectstroff; |
---|
1025 | off_t off; |
---|
1026 | Elf_Shdr shdr; |
---|
1027 | |
---|
1028 | rtems_rtl_obj_caches (§s, &strings, NULL); |
---|
1029 | |
---|
1030 | if (!sects || !strings) |
---|
1031 | return false; |
---|
1032 | |
---|
1033 | /* |
---|
1034 | * Get the offset to the section string table. |
---|
1035 | */ |
---|
1036 | off = obj->ooffset + ehdr->e_shoff + (ehdr->e_shstrndx * ehdr->e_shentsize); |
---|
1037 | |
---|
1038 | if (!rtems_rtl_obj_cache_read_byval (sects, fd, off, &shdr, sizeof (shdr))) |
---|
1039 | return false; |
---|
1040 | |
---|
1041 | if (shdr.sh_type != SHT_STRTAB) |
---|
1042 | { |
---|
1043 | rtems_rtl_set_error (EINVAL, "bad .sectstr section type"); |
---|
1044 | return false; |
---|
1045 | } |
---|
1046 | |
---|
1047 | sectstroff = obj->ooffset + shdr.sh_offset; |
---|
1048 | |
---|
1049 | for (section = 0; section < ehdr->e_shnum; ++section) |
---|
1050 | { |
---|
1051 | char* name; |
---|
1052 | size_t len; |
---|
1053 | uint32_t flags; |
---|
1054 | |
---|
1055 | /* |
---|
1056 | * Make sure section is at least 32bits to avoid 16-bit overflow errors. |
---|
1057 | */ |
---|
1058 | off = obj->ooffset + ehdr->e_shoff + (((uint32_t) section) * ehdr->e_shentsize); |
---|
1059 | |
---|
1060 | if (rtems_rtl_trace (RTEMS_RTL_TRACE_DETAIL)) |
---|
1061 | printf ("rtl: section header: %2d: offset=%d\n", section, (int) off); |
---|
1062 | |
---|
1063 | if (!rtems_rtl_obj_cache_read_byval (sects, fd, off, &shdr, sizeof (shdr))) |
---|
1064 | return false; |
---|
1065 | |
---|
1066 | len = RTEMS_RTL_ELF_STRING_MAX; |
---|
1067 | if (!rtems_rtl_obj_cache_read (strings, fd, |
---|
1068 | sectstroff + shdr.sh_name, |
---|
1069 | (void**) &name, &len)) |
---|
1070 | return false; |
---|
1071 | |
---|
1072 | if (rtems_rtl_trace (RTEMS_RTL_TRACE_DETAIL)) |
---|
1073 | printf ("rtl: section: %2d: name=%s type=%d flags=%08x link=%d info=%d\n", |
---|
1074 | section, name, (int) shdr.sh_type, (unsigned int) shdr.sh_flags, |
---|
1075 | (int) shdr.sh_link, (int) shdr.sh_info); |
---|
1076 | |
---|
1077 | flags = 0; |
---|
1078 | |
---|
1079 | switch (shdr.sh_type) |
---|
1080 | { |
---|
1081 | case SHT_NULL: |
---|
1082 | /* |
---|
1083 | * Ignore. |
---|
1084 | */ |
---|
1085 | break; |
---|
1086 | |
---|
1087 | case SHT_PROGBITS: |
---|
1088 | /* |
---|
1089 | * There are 2 program bits sections. One is the program text and the |
---|
1090 | * other is the program data. The program text is flagged |
---|
1091 | * alloc/executable and the program data is flagged alloc/writable. |
---|
1092 | */ |
---|
1093 | if ((shdr.sh_flags & SHF_ALLOC) == SHF_ALLOC) |
---|
1094 | { |
---|
1095 | if ((shdr.sh_flags & SHF_EXECINSTR) == SHF_EXECINSTR) |
---|
1096 | flags = RTEMS_RTL_OBJ_SECT_TEXT | RTEMS_RTL_OBJ_SECT_LOAD; |
---|
1097 | else if ((shdr.sh_flags & SHF_WRITE) == SHF_WRITE) |
---|
1098 | flags = RTEMS_RTL_OBJ_SECT_DATA | RTEMS_RTL_OBJ_SECT_LOAD; |
---|
1099 | else |
---|
1100 | flags = RTEMS_RTL_OBJ_SECT_CONST | RTEMS_RTL_OBJ_SECT_LOAD; |
---|
1101 | } |
---|
1102 | break; |
---|
1103 | |
---|
1104 | case SHT_NOBITS: |
---|
1105 | /* |
---|
1106 | * There is 1 NOBIT section which is the .bss section. There is nothing |
---|
1107 | * but a definition as the .bss is just a clear region of memory. |
---|
1108 | */ |
---|
1109 | if ((shdr.sh_flags & (SHF_ALLOC | SHF_WRITE)) == (SHF_ALLOC | SHF_WRITE)) |
---|
1110 | flags = RTEMS_RTL_OBJ_SECT_BSS | RTEMS_RTL_OBJ_SECT_ZERO; |
---|
1111 | break; |
---|
1112 | |
---|
1113 | case SHT_RELA: |
---|
1114 | flags = RTEMS_RTL_OBJ_SECT_RELA | RTEMS_RTL_OBJ_SECT_LOAD; |
---|
1115 | break; |
---|
1116 | |
---|
1117 | case SHT_REL: |
---|
1118 | /* |
---|
1119 | * The sh_link holds the section index for the symbol table. The sh_info |
---|
1120 | * holds the section index the relocations apply to. |
---|
1121 | */ |
---|
1122 | flags = RTEMS_RTL_OBJ_SECT_REL | RTEMS_RTL_OBJ_SECT_LOAD; |
---|
1123 | break; |
---|
1124 | |
---|
1125 | case SHT_SYMTAB: |
---|
1126 | flags = RTEMS_RTL_OBJ_SECT_SYM; |
---|
1127 | break; |
---|
1128 | |
---|
1129 | case SHT_STRTAB: |
---|
1130 | flags = RTEMS_RTL_OBJ_SECT_STR; |
---|
1131 | break; |
---|
1132 | |
---|
1133 | case SHT_INIT_ARRAY: |
---|
1134 | /* |
---|
1135 | * Constructors are text and need to be loaded. |
---|
1136 | */ |
---|
1137 | flags = (RTEMS_RTL_OBJ_SECT_CTOR | |
---|
1138 | RTEMS_RTL_OBJ_SECT_TEXT | |
---|
1139 | RTEMS_RTL_OBJ_SECT_LOAD); |
---|
1140 | break; |
---|
1141 | |
---|
1142 | case SHT_FINI_ARRAY: |
---|
1143 | /* |
---|
1144 | * Destructors are text and need to be loaded. |
---|
1145 | */ |
---|
1146 | flags = (RTEMS_RTL_OBJ_SECT_DTOR | |
---|
1147 | RTEMS_RTL_OBJ_SECT_TEXT | |
---|
1148 | RTEMS_RTL_OBJ_SECT_LOAD); |
---|
1149 | break; |
---|
1150 | |
---|
1151 | default: |
---|
1152 | /* |
---|
1153 | * See if there are architecture specific flags? |
---|
1154 | */ |
---|
1155 | flags = rtems_rtl_elf_section_flags (obj, &shdr); |
---|
1156 | if (flags == 0) |
---|
1157 | { |
---|
1158 | if (rtems_rtl_trace (RTEMS_RTL_TRACE_WARNING)) |
---|
1159 | printf ("rtl: unsupported section: %2d: type=%02d flags=%02x\n", |
---|
1160 | section, (int) shdr.sh_type, (int) shdr.sh_flags); |
---|
1161 | } |
---|
1162 | break; |
---|
1163 | } |
---|
1164 | |
---|
1165 | if (flags != 0) |
---|
1166 | { |
---|
1167 | /* |
---|
1168 | * If the object file is part of a library check the section's name. If it |
---|
1169 | * starts with '.text.*' see if the last part is a global symbol. If a |
---|
1170 | * global symbol exists we have to assume the symbol in the archive is a |
---|
1171 | * duplicate can can be ignored. |
---|
1172 | */ |
---|
1173 | if (rtems_rtl_obj_aname_valid (obj)) |
---|
1174 | { |
---|
1175 | const char* symname = rtems_rtl_elf_separated_section (name); |
---|
1176 | if (symname != NULL && rtems_rtl_symbol_global_find (symname)) |
---|
1177 | flags &= ~RTEMS_RTL_OBJ_SECT_LOAD; |
---|
1178 | } |
---|
1179 | |
---|
1180 | /* |
---|
1181 | * If link ordering this section must appear in the same order in memory |
---|
1182 | * as the linked-to section relative to the sections it loads with. |
---|
1183 | */ |
---|
1184 | if ((shdr.sh_flags & SHF_LINK_ORDER) != 0) |
---|
1185 | flags |= RTEMS_RTL_OBJ_SECT_LINK; |
---|
1186 | |
---|
1187 | /* |
---|
1188 | * Some architexctures have a named PROGBIT section for INIT/FINI. |
---|
1189 | */ |
---|
1190 | if (strcmp (".ctors", name) == 0) |
---|
1191 | flags |= RTEMS_RTL_OBJ_SECT_CTOR; |
---|
1192 | if (strcmp (".dtors", name) == 0) |
---|
1193 | flags |= RTEMS_RTL_OBJ_SECT_DTOR; |
---|
1194 | |
---|
1195 | if (rtems_rtl_elf_unwind_parse (obj, name, flags)) |
---|
1196 | { |
---|
1197 | flags &= ~(RTEMS_RTL_OBJ_SECT_TEXT | RTEMS_RTL_OBJ_SECT_CONST); |
---|
1198 | flags |= RTEMS_RTL_OBJ_SECT_EH; |
---|
1199 | } |
---|
1200 | |
---|
1201 | /* |
---|
1202 | * Architecture specific parsing. Modified or extends the flags. |
---|
1203 | */ |
---|
1204 | flags = rtems_rtl_elf_arch_parse_section (obj, section, name, &shdr, flags); |
---|
1205 | if (flags == 0) |
---|
1206 | { |
---|
1207 | if (rtems_rtl_trace (RTEMS_RTL_TRACE_WARNING)) |
---|
1208 | printf ("rtl: unsupported section: %2d: type=%02d flags=%02x\n", |
---|
1209 | section, (int) shdr.sh_type, (int) shdr.sh_flags); |
---|
1210 | rtems_rtl_set_error (ENOMEM, "invalid architecture section: %s", name); |
---|
1211 | return false; |
---|
1212 | } |
---|
1213 | |
---|
1214 | /* |
---|
1215 | * Add the section. |
---|
1216 | */ |
---|
1217 | if (!rtems_rtl_obj_add_section (obj, section, name, |
---|
1218 | shdr.sh_size, shdr.sh_offset, |
---|
1219 | shdr.sh_addralign, shdr.sh_link, |
---|
1220 | shdr.sh_info, flags)) |
---|
1221 | return false; |
---|
1222 | } |
---|
1223 | } |
---|
1224 | |
---|
1225 | return true; |
---|
1226 | } |
---|
1227 | |
---|
1228 | static bool |
---|
1229 | rtems_rtl_elf_add_common (rtems_rtl_obj* obj, size_t size, uint32_t alignment) |
---|
1230 | { |
---|
1231 | if (size > 0) |
---|
1232 | { |
---|
1233 | if (!rtems_rtl_obj_add_section (obj, SHN_COMMON, ".common.rtems.rtl", |
---|
1234 | size, 0, alignment, 0, 0, |
---|
1235 | RTEMS_RTL_OBJ_SECT_BSS | RTEMS_RTL_OBJ_SECT_ZERO)) |
---|
1236 | return false; |
---|
1237 | } |
---|
1238 | return true; |
---|
1239 | } |
---|
1240 | |
---|
1241 | bool |
---|
1242 | rtems_rtl_elf_file_check (rtems_rtl_obj* obj, int fd) |
---|
1243 | { |
---|
1244 | rtems_rtl_obj_cache* header; |
---|
1245 | Elf_Ehdr ehdr; |
---|
1246 | |
---|
1247 | rtems_rtl_obj_caches (&header, NULL, NULL); |
---|
1248 | |
---|
1249 | if (!rtems_rtl_obj_cache_read_byval (header, fd, obj->ooffset, |
---|
1250 | &ehdr, sizeof (ehdr))) |
---|
1251 | return false; |
---|
1252 | |
---|
1253 | /* |
---|
1254 | * Check we have a valid ELF file. |
---|
1255 | */ |
---|
1256 | if ((memcmp (ELFMAG, ehdr.e_ident, SELFMAG) != 0) |
---|
1257 | || ehdr.e_ident[EI_CLASS] != ELFCLASS) |
---|
1258 | { |
---|
1259 | return false; |
---|
1260 | } |
---|
1261 | |
---|
1262 | if ((ehdr.e_ident[EI_VERSION] != EV_CURRENT) |
---|
1263 | || (ehdr.e_version != EV_CURRENT) |
---|
1264 | || (ehdr.e_ident[EI_DATA] != ELFDEFNNAME (MACHDEP_ENDIANNESS))) |
---|
1265 | { |
---|
1266 | return false; |
---|
1267 | } |
---|
1268 | |
---|
1269 | return true; |
---|
1270 | } |
---|
1271 | |
---|
1272 | static bool |
---|
1273 | rtems_rtl_elf_load_linkmap (rtems_rtl_obj* obj) |
---|
1274 | { |
---|
1275 | rtems_chain_control* sections = NULL; |
---|
1276 | rtems_chain_node* node = NULL; |
---|
1277 | int sec_num = 0; |
---|
1278 | section_detail* sd; |
---|
1279 | int i = 0; |
---|
1280 | size_t m; |
---|
1281 | |
---|
1282 | /* |
---|
1283 | * The section masks to add to the linkmap. |
---|
1284 | */ |
---|
1285 | const uint32_t sect_mask[] = { |
---|
1286 | RTEMS_RTL_OBJ_SECT_TEXT | RTEMS_RTL_OBJ_SECT_LOAD, |
---|
1287 | RTEMS_RTL_OBJ_SECT_CONST | RTEMS_RTL_OBJ_SECT_LOAD, |
---|
1288 | RTEMS_RTL_OBJ_SECT_DATA | RTEMS_RTL_OBJ_SECT_LOAD, |
---|
1289 | RTEMS_RTL_OBJ_SECT_BSS |
---|
1290 | }; |
---|
1291 | const size_t sect_masks = sizeof (sect_mask) / sizeof (sect_mask[0]); |
---|
1292 | |
---|
1293 | /* |
---|
1294 | * Caculate the size of sections' name. |
---|
1295 | */ |
---|
1296 | for (m = 0; m < sect_masks; ++m) |
---|
1297 | { |
---|
1298 | sections = &obj->sections; |
---|
1299 | node = rtems_chain_first (sections); |
---|
1300 | while (!rtems_chain_is_tail (sections, node)) |
---|
1301 | { |
---|
1302 | rtems_rtl_obj_sect* sect = (rtems_rtl_obj_sect*) node; |
---|
1303 | const uint32_t mask = sect_mask[m]; |
---|
1304 | if ((sect->size != 0) && ((sect->flags & mask) == mask)) |
---|
1305 | { |
---|
1306 | ++sec_num; |
---|
1307 | } |
---|
1308 | node = rtems_chain_next (node); |
---|
1309 | } |
---|
1310 | } |
---|
1311 | |
---|
1312 | obj->obj_num = 1; |
---|
1313 | obj->linkmap = rtems_rtl_alloc_new (RTEMS_RTL_ALLOC_OBJECT, |
---|
1314 | sizeof(struct link_map) + |
---|
1315 | sec_num * sizeof (section_detail), true); |
---|
1316 | if (!obj->linkmap) |
---|
1317 | { |
---|
1318 | rtems_rtl_set_error (ENOMEM, "no memory for obj linkmap"); |
---|
1319 | return false; |
---|
1320 | } |
---|
1321 | |
---|
1322 | obj->linkmap->name = obj->oname; |
---|
1323 | obj->linkmap->sec_num = sec_num; |
---|
1324 | obj->linkmap->sec_detail = (section_detail*) (obj->linkmap + 1); |
---|
1325 | obj->linkmap->rpathlen = 0; |
---|
1326 | obj->linkmap->rpath = NULL; |
---|
1327 | obj->linkmap->l_next = NULL; |
---|
1328 | obj->linkmap->l_prev = NULL; |
---|
1329 | obj->linkmap->sec_addr[rap_text] = obj->text_base; |
---|
1330 | obj->linkmap->sec_addr[rap_const] = obj->const_base; |
---|
1331 | obj->linkmap->sec_addr[rap_data] = obj->data_base; |
---|
1332 | obj->linkmap->sec_addr[rap_bss] = obj->bss_base; |
---|
1333 | |
---|
1334 | sd = obj->linkmap->sec_detail; |
---|
1335 | sections = &obj->sections; |
---|
1336 | node = rtems_chain_first (sections); |
---|
1337 | |
---|
1338 | for (m = 0; m < sect_masks; ++m) |
---|
1339 | { |
---|
1340 | sections = &obj->sections; |
---|
1341 | node = rtems_chain_first (sections); |
---|
1342 | while (!rtems_chain_is_tail (sections, node)) |
---|
1343 | { |
---|
1344 | rtems_rtl_obj_sect* sect = (rtems_rtl_obj_sect*) node; |
---|
1345 | const uint32_t mask = sect_mask[m]; |
---|
1346 | |
---|
1347 | if ((sect->size != 0) && ((sect->flags & mask) == mask)) |
---|
1348 | { |
---|
1349 | sd[i].name = sect->name; |
---|
1350 | sd[i].size = sect->size; |
---|
1351 | if ((mask & RTEMS_RTL_OBJ_SECT_TEXT) != 0) |
---|
1352 | { |
---|
1353 | sd[i].rap_id = rap_text; |
---|
1354 | sd[i].offset = sect->base - obj->text_base; |
---|
1355 | } |
---|
1356 | if ((mask & RTEMS_RTL_OBJ_SECT_CONST) != 0) |
---|
1357 | { |
---|
1358 | sd[i].rap_id = rap_const; |
---|
1359 | sd[i].offset = sect->base - obj->const_base; |
---|
1360 | } |
---|
1361 | if ((mask & RTEMS_RTL_OBJ_SECT_DATA) != 0) |
---|
1362 | { |
---|
1363 | sd[i].rap_id = rap_data; |
---|
1364 | sd[i].offset = sect->base - obj->data_base; |
---|
1365 | } |
---|
1366 | if ((mask & RTEMS_RTL_OBJ_SECT_BSS) != 0) |
---|
1367 | { |
---|
1368 | sd[i].rap_id = rap_bss; |
---|
1369 | sd[i].offset = sect->base - obj->bss_base; |
---|
1370 | } |
---|
1371 | |
---|
1372 | ++i; |
---|
1373 | } |
---|
1374 | node = rtems_chain_next (node); |
---|
1375 | } |
---|
1376 | } |
---|
1377 | |
---|
1378 | return true; |
---|
1379 | } |
---|
1380 | |
---|
1381 | bool |
---|
1382 | rtems_rtl_elf_file_load (rtems_rtl_obj* obj, int fd) |
---|
1383 | { |
---|
1384 | rtems_rtl_obj_cache* header; |
---|
1385 | Elf_Ehdr ehdr; |
---|
1386 | rtems_rtl_elf_reloc_data relocs = { 0 }; |
---|
1387 | rtems_rtl_elf_common_data common = { 0 }; |
---|
1388 | |
---|
1389 | rtems_rtl_obj_caches (&header, NULL, NULL); |
---|
1390 | |
---|
1391 | if (!rtems_rtl_obj_cache_read_byval (header, fd, obj->ooffset, |
---|
1392 | &ehdr, sizeof (ehdr))) |
---|
1393 | return false; |
---|
1394 | |
---|
1395 | /* |
---|
1396 | * Check we have a valid ELF file. |
---|
1397 | */ |
---|
1398 | if ((memcmp (ELFMAG, ehdr.e_ident, SELFMAG) != 0) |
---|
1399 | || ehdr.e_ident[EI_CLASS] != ELFCLASS) |
---|
1400 | { |
---|
1401 | rtems_rtl_set_error (EINVAL, "invalid ELF file format"); |
---|
1402 | return false; |
---|
1403 | } |
---|
1404 | |
---|
1405 | if ((ehdr.e_ident[EI_VERSION] != EV_CURRENT) |
---|
1406 | || (ehdr.e_version != EV_CURRENT) |
---|
1407 | || (ehdr.e_ident[EI_DATA] != ELFDEFNNAME (MACHDEP_ENDIANNESS))) |
---|
1408 | { |
---|
1409 | rtems_rtl_set_error (EINVAL, "unsupported ELF file version"); |
---|
1410 | return false; |
---|
1411 | } |
---|
1412 | |
---|
1413 | if (!rtems_rtl_elf_machine_check (&ehdr)) |
---|
1414 | { |
---|
1415 | rtems_rtl_set_error (EINVAL, "unsupported machine type"); |
---|
1416 | return false; |
---|
1417 | } |
---|
1418 | |
---|
1419 | if (ehdr.e_type == ET_DYN) |
---|
1420 | { |
---|
1421 | rtems_rtl_set_error (EINVAL, "unsupported ELF file type"); |
---|
1422 | return false; |
---|
1423 | } |
---|
1424 | |
---|
1425 | if (ehdr.e_phentsize != 0) |
---|
1426 | { |
---|
1427 | rtems_rtl_set_error (EINVAL, "ELF file contains program headers"); |
---|
1428 | return false; |
---|
1429 | } |
---|
1430 | |
---|
1431 | if (ehdr.e_shentsize != sizeof (Elf_Shdr)) |
---|
1432 | { |
---|
1433 | rtems_rtl_set_error (EINVAL, "invalid ELF section header size"); |
---|
1434 | return false; |
---|
1435 | } |
---|
1436 | |
---|
1437 | /* |
---|
1438 | * Parse the section information first so we have the memory map of the object |
---|
1439 | * file and the memory allocated. Any further allocations we make to complete |
---|
1440 | * the load will not fragment the memory. |
---|
1441 | */ |
---|
1442 | if (!rtems_rtl_elf_parse_sections (obj, fd, &ehdr)) |
---|
1443 | return false; |
---|
1444 | |
---|
1445 | /* |
---|
1446 | * See if there are any common variables and if there are add a common |
---|
1447 | * section. |
---|
1448 | */ |
---|
1449 | if (!rtems_rtl_obj_load_symbols (obj, fd, rtems_rtl_elf_common, &common)) |
---|
1450 | return false; |
---|
1451 | if (!rtems_rtl_elf_add_common (obj, common.size, common.alignment)) |
---|
1452 | return false; |
---|
1453 | |
---|
1454 | /* |
---|
1455 | * Set the entry point if there is one. |
---|
1456 | */ |
---|
1457 | obj->entry = (void*)(uintptr_t) ehdr.e_entry; |
---|
1458 | |
---|
1459 | /* |
---|
1460 | * Lock the allocator so the section memory and the trampoline memory are as |
---|
1461 | * clock as possible. |
---|
1462 | */ |
---|
1463 | rtems_rtl_alloc_lock (); |
---|
1464 | |
---|
1465 | /* |
---|
1466 | * Allocate the sections. |
---|
1467 | */ |
---|
1468 | if (!rtems_rtl_obj_alloc_sections (obj, fd, rtems_rtl_elf_arch_alloc, &ehdr)) |
---|
1469 | return false; |
---|
1470 | |
---|
1471 | /* |
---|
1472 | * Load the sections and symbols and then relocation to the base address. |
---|
1473 | */ |
---|
1474 | if (!rtems_rtl_obj_load_sections (obj, fd, rtems_rtl_elf_loader, &ehdr)) |
---|
1475 | return false; |
---|
1476 | |
---|
1477 | /* |
---|
1478 | * Parse the relocation records. It lets us know how many dependents |
---|
1479 | * and fixup trampolines there are. |
---|
1480 | */ |
---|
1481 | if (!rtems_rtl_obj_relocate (obj, fd, rtems_rtl_elf_relocs_parser, &relocs)) |
---|
1482 | return false; |
---|
1483 | |
---|
1484 | if (!rtems_rtl_elf_dependents (obj, &relocs)) |
---|
1485 | return false; |
---|
1486 | |
---|
1487 | if (!rtems_rtl_elf_alloc_trampoline (obj, relocs.unresolved)) |
---|
1488 | return false; |
---|
1489 | |
---|
1490 | /* |
---|
1491 | * Unlock the allocator. |
---|
1492 | */ |
---|
1493 | rtems_rtl_alloc_unlock (); |
---|
1494 | |
---|
1495 | if (!rtems_rtl_obj_load_symbols (obj, fd, rtems_rtl_elf_symbols, &ehdr)) |
---|
1496 | return false; |
---|
1497 | |
---|
1498 | if (!rtems_rtl_obj_relocate (obj, fd, rtems_rtl_elf_relocs_locator, &ehdr)) |
---|
1499 | return false; |
---|
1500 | |
---|
1501 | rtems_rtl_symbol_obj_erase_local (obj); |
---|
1502 | |
---|
1503 | if (!rtems_rtl_elf_load_linkmap (obj)) |
---|
1504 | { |
---|
1505 | return false; |
---|
1506 | } |
---|
1507 | |
---|
1508 | if (!rtems_rtl_elf_unwind_register (obj)) |
---|
1509 | { |
---|
1510 | return false; |
---|
1511 | } |
---|
1512 | |
---|
1513 | return true; |
---|
1514 | } |
---|
1515 | |
---|
1516 | bool |
---|
1517 | rtems_rtl_elf_file_unload (rtems_rtl_obj* obj) |
---|
1518 | { |
---|
1519 | rtems_rtl_elf_arch_free (obj); |
---|
1520 | rtems_rtl_elf_unwind_deregister (obj); |
---|
1521 | return true; |
---|
1522 | } |
---|
1523 | |
---|
1524 | rtems_rtl_loader_format* |
---|
1525 | rtems_rtl_elf_file_sig (void) |
---|
1526 | { |
---|
1527 | return &elf_sig; |
---|
1528 | } |
---|