1 | #include <sys/cdefs.h> |
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2 | |
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3 | #include <errno.h> |
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4 | #include <stdio.h> |
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5 | #include <sys/types.h> |
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6 | #include <sys/stat.h> |
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7 | |
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8 | #include <rtems/rtl/rtl.h> |
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9 | #include "rtl-elf.h" |
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10 | #include "rtl-error.h" |
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11 | #include "rtl-trace.h" |
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12 | |
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13 | static inline Elf_Addr |
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14 | load_ptr(void *where) |
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15 | { |
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16 | Elf_Addr res; |
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17 | |
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18 | memcpy(&res, where, sizeof(res)); |
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19 | |
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20 | return (res); |
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21 | } |
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22 | |
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23 | static inline void |
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24 | store_ptr(void *where, Elf_Addr val) |
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25 | { |
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26 | memcpy(where, &val, sizeof(val)); |
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27 | } |
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28 | |
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29 | bool |
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30 | rtems_rtl_elf_rel_resolve_sym (Elf_Word type) |
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31 | { |
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32 | return true; |
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33 | } |
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34 | |
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35 | bool |
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36 | rtems_rtl_elf_relocate_rela (const rtems_rtl_obj_t* obj, |
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37 | const Elf_Rela* rela, |
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38 | const rtems_rtl_obj_sect_t* sect, |
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39 | const char* symname, |
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40 | const Elf_Byte syminfo, |
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41 | const Elf_Word symvalue) |
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42 | { |
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43 | |
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44 | Elf_Addr *where; |
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45 | Elf_Word tmp; |
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46 | |
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47 | where = (Elf_Addr *)(sect->base + rela->r_offset); |
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48 | if (rtems_rtl_trace (RTEMS_RTL_TRACE_RELOC)) { |
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49 | printf("relocated address 0x%08lx\n", (Elf_Addr)where); |
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50 | } |
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51 | |
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52 | switch (ELF_R_TYPE(rela->r_info)) { |
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53 | case R_TYPE(NONE): |
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54 | break; |
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55 | |
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56 | case R_TYPE(16_RELA): |
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57 | /* |
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58 | * half16: S + A |
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59 | */ |
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60 | *(uint16_t *)where = (symvalue + rela->r_addend) & 0xffff; |
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61 | break; |
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62 | |
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63 | case R_TYPE(24_RELA): |
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64 | /* |
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65 | * imm24: (S + A) & 0xFFFFFF |
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66 | */ |
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67 | tmp = symvalue + rela->r_addend; |
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68 | if (((Elf_Sword)tmp > 0x7fffff) || ((Elf_Sword)tmp < -0x800000)) { |
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69 | printf("24_RELA Overflow\n"); |
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70 | return false; |
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71 | } |
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72 | *where = (*where & 0xff000000) | (tmp & 0xffffff); |
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73 | break; |
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74 | |
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75 | case R_TYPE(32_RELA): |
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76 | /* |
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77 | * word32: S + A |
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78 | */ |
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79 | *where += symvalue + rela->r_addend; |
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80 | break; |
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81 | |
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82 | case R_TYPE(26_PCREL_RELA): |
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83 | /* |
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84 | * disp24: ((S + A - P) >> 2) & 0xFFFFFF |
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85 | */ |
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86 | tmp = symvalue + rela->r_addend - (Elf_Addr)where; |
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87 | tmp = (Elf_Sword)tmp >> 2; |
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88 | if (((Elf_Sword)tmp > 0x7fffff) || ((Elf_Sword)tmp < -0x800000)) { |
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89 | printf("26_PCREL_RELA Overflow\n"); |
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90 | return false; |
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91 | } |
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92 | |
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93 | *where = (*where & 0xff000000) | (tmp & 0xffffff); |
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94 | break; |
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95 | |
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96 | case R_TYPE(18_PCREL_RELA): |
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97 | /* |
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98 | * disp16: ((S + A - P) >> 2) & 0xFFFFFF |
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99 | */ |
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100 | tmp = symvalue + rela->r_addend - (Elf_Addr)where; |
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101 | tmp = (Elf_Sword)tmp >> 2; |
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102 | if (((Elf_Sword)tmp > 0x7fff) || ((Elf_Sword)tmp < -0x8000)) { |
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103 | printf("18_PCREL_RELA Overflow\n"); |
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104 | return false; |
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105 | } |
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106 | |
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107 | *where = (*where & 0xffff0000) | (tmp & 0xffff); |
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108 | break; |
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109 | |
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110 | case R_TYPE(HI16_ULO_RELA): |
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111 | /* |
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112 | * imm16: ((S + A) >> 16) |
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113 | */ |
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114 | tmp = *where; |
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115 | tmp += ((symvalue + rela->r_addend) >> 16) & 0xffff; |
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116 | *where = tmp; |
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117 | break; |
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118 | |
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119 | case R_TYPE(HI16_SLO_RELA): |
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120 | /* |
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121 | * imm16: ((S + A) >> 16) or ((S + A + 0x10000) >> 16) |
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122 | */ |
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123 | tmp = symvalue + rela->r_addend; |
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124 | if (tmp & 0x8000) tmp += 0x10000; |
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125 | tmp = (tmp >> 16) & 0xffff; |
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126 | *where += tmp; |
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127 | break; |
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128 | |
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129 | case R_TYPE(LO16_RELA): |
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130 | /* |
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131 | * imm16: (S + A) & 0xFFFF |
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132 | */ |
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133 | tmp = symvalue + rela->r_addend; |
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134 | *where = (*where & 0xffff0000) | (tmp & 0xffff); |
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135 | break; |
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136 | |
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137 | default: |
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138 | rtems_rtl_set_error (EINVAL, "rela type record not supported"); |
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139 | printf("Unsupported rela reloc types\n"); |
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140 | return false; |
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141 | } |
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142 | return true; |
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143 | } |
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144 | |
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145 | bool |
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146 | rtems_rtl_elf_relocate_rel (const rtems_rtl_obj_t* obj, |
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147 | const Elf_Rel* rel, |
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148 | const rtems_rtl_obj_sect_t* sect, |
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149 | const char* symname, |
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150 | const Elf_Byte syminfo, |
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151 | const Elf_Word symvalue) |
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152 | { |
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153 | |
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154 | rtems_rtl_set_error (EINVAL, "rel type record not supported"); |
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155 | return true; |
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156 | } |
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