1 | |
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2 | #include <sys/cdefs.h> |
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3 | |
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4 | #include <errno.h> |
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5 | #include <stdio.h> |
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6 | #include <sys/types.h> |
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7 | #include <sys/stat.h> |
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8 | |
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9 | #include <rtems/rtl/rtl.h> |
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10 | #include "rtl-elf.h" |
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11 | #include "rtl-error.h" |
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12 | #include <rtems/rtl/rtl-trace.h> |
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13 | #include "rtl-unwind.h" |
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14 | #include "rtl-unwind-dw2.h" |
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15 | |
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16 | uint32_t |
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17 | rtems_rtl_elf_section_flags (const rtems_rtl_obj* obj, |
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18 | const Elf_Shdr* shdr) |
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19 | { |
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20 | return 0; |
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21 | } |
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22 | |
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23 | bool |
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24 | rtems_rtl_elf_rel_resolve_sym (Elf_Word type) |
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25 | { |
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26 | return true; |
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27 | } |
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28 | |
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29 | size_t |
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30 | rtems_rtl_elf_relocate_tramp_max_size (void) |
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31 | { |
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32 | /* |
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33 | * Disable by returning 0. |
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34 | */ |
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35 | return 0; |
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36 | } |
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37 | |
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38 | bool |
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39 | rtems_rtl_elf_relocate_rela_tramp (rtems_rtl_obj* obj, |
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40 | const Elf_Rela* rela, |
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41 | const rtems_rtl_obj_sect* sect, |
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42 | const char* symname, |
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43 | const Elf_Byte syminfo, |
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44 | const Elf_Word symvalue) |
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45 | { |
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46 | (void) obj; |
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47 | (void) rela; |
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48 | (void) sect; |
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49 | (void) symname; |
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50 | (void) syminfo; |
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51 | (void) symvalue; |
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52 | return true; |
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53 | } |
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54 | |
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55 | bool |
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56 | rtems_rtl_elf_relocate_rela (rtems_rtl_obj* obj, |
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57 | const Elf_Rela* rela, |
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58 | const rtems_rtl_obj_sect* sect, |
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59 | const char* symname, |
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60 | const Elf_Byte syminfo, |
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61 | const Elf_Word symvalue) |
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62 | { |
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63 | Elf_Addr *where; |
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64 | Elf_Sword tmp; |
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65 | |
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66 | where = (Elf_Addr *)(sect->base + rela->r_offset); |
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67 | |
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68 | /* Handle the not 4byte aligned address carefully */ |
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69 | |
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70 | switch (ELF_R_TYPE(rela->r_info)) { |
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71 | case R_TYPE(NONE): |
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72 | break; |
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73 | |
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74 | case R_TYPE(32): |
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75 | *(uint16_t *)where = ((symvalue + rela->r_addend) >> 16) & 0xffff; |
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76 | *((uint16_t *)where + 1) = (symvalue + rela->r_addend) & 0xffff; |
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77 | |
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78 | if (rtems_rtl_trace (RTEMS_RTL_TRACE_RELOC)) { |
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79 | printf("*where 0x%04x%04x\n", *((uint16_t *)where + 1), *(uint16_t *)where); |
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80 | } |
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81 | break; |
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82 | |
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83 | case R_TYPE(PCREL10): |
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84 | /* beq, bge, bgeu, bgt, bgtu, ble, bleu, blt, bltu, bne */ |
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85 | if (rtems_rtl_trace (RTEMS_RTL_TRACE_RELOC)) { |
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86 | printf("*where %x\n", *(uint16_t *)where); |
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87 | printf("symvalue - where %x\n", (int)(symvalue - (Elf_Word)where)); |
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88 | } |
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89 | tmp = (symvalue + rela->r_addend - ((Elf_Word)where + 2)); /* pc is the next instruction */ |
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90 | tmp = (Elf_Sword)tmp >> 1; |
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91 | if (((Elf32_Sword)tmp > 0x1ff) || ((Elf32_Sword)tmp < -(Elf32_Sword)0x200)){ |
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92 | printf("Overflow for PCREL10: %ld exceed -0x200:0x1ff\n", tmp); |
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93 | return false; |
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94 | } |
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95 | |
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96 | *(uint16_t *)where = (*(uint16_t *)where & 0xfc00) | (tmp & 0x3ff); |
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97 | |
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98 | if (rtems_rtl_trace (RTEMS_RTL_TRACE_RELOC)) { |
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99 | printf("*where 0x%04x\n", *(uint16_t *)where); |
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100 | } |
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101 | |
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102 | break; |
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103 | |
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104 | default: |
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105 | rtems_rtl_set_error (EINVAL, "rela type record not supported"); |
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106 | printf("Unsupported reloc types\n"); |
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107 | return false; |
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108 | } |
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109 | |
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110 | return true; |
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111 | } |
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112 | |
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113 | bool |
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114 | rtems_rtl_elf_relocate_rel_tramp (rtems_rtl_obj* obj, |
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115 | const Elf_Rel* rel, |
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116 | const rtems_rtl_obj_sect* sect, |
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117 | const char* symname, |
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118 | const Elf_Byte syminfo, |
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119 | const Elf_Word symvalue) |
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120 | { |
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121 | (void) obj; |
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122 | (void) rel; |
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123 | (void) sect; |
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124 | (void) symname; |
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125 | (void) syminfo; |
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126 | (void) symvalue; |
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127 | rtems_rtl_set_error (EINVAL, "rel type record not supported"); |
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128 | return false; |
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129 | } |
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130 | |
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131 | bool |
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132 | rtems_rtl_elf_relocate_rel (rtems_rtl_obj* obj, |
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133 | const Elf_Rel* rel, |
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134 | const rtems_rtl_obj_sect* sect, |
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135 | const char* symname, |
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136 | const Elf_Byte syminfo, |
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137 | const Elf_Word symvalue) |
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138 | { |
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139 | (void) obj; |
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140 | (void) rel; |
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141 | (void) sect; |
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142 | (void) symname; |
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143 | (void) syminfo; |
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144 | (void) symvalue; |
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145 | rtems_rtl_set_error (EINVAL, "rel type record not supported"); |
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146 | return false; |
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147 | } |
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148 | |
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149 | bool |
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150 | rtems_rtl_elf_unwind_parse (const rtems_rtl_obj* obj, |
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151 | const char* name, |
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152 | uint32_t flags) |
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153 | { |
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154 | return rtems_rtl_elf_unwind_dw2_parse (obj, name, flags); |
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155 | } |
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156 | |
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157 | bool |
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158 | rtems_rtl_elf_unwind_register (rtems_rtl_obj* obj) |
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159 | { |
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160 | return rtems_rtl_elf_unwind_dw2_register (obj); |
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161 | } |
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162 | |
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163 | bool |
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164 | rtems_rtl_elf_unwind_deregister (rtems_rtl_obj* obj) |
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165 | { |
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166 | return rtems_rtl_elf_unwind_dw2_deregister (obj); |
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167 | } |
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