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1 /* |
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2 |
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3 Copyright (C) 2000,2004 Silicon Graphics, Inc. All Rights Reserved. |
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4 |
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5 This program is free software; you can redistribute it and/or modify it |
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6 under the terms of version 2.1 of the GNU Lesser General Public License |
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7 as published by the Free Software Foundation. |
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8 |
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9 This program is distributed in the hope that it would be useful, but |
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10 WITHOUT ANY WARRANTY; without even the implied warranty of |
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11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. |
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12 |
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13 Further, this software is distributed without any warranty that it is |
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14 free of the rightful claim of any third person regarding infringement |
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15 or the like. Any license provided herein, whether implied or |
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16 otherwise, applies only to this software file. Patent licenses, if |
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17 any, provided herein do not apply to combinations of this program with |
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18 other software, or any other product whatsoever. |
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19 |
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20 You should have received a copy of the GNU Lesser General Public |
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21 License along with this program; if not, write the Free Software |
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22 Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston MA 02110-1301, |
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23 USA. |
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24 |
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25 Contact information: Silicon Graphics, Inc., 1500 Crittenden Lane, |
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26 Mountain View, CA 94043, or: |
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27 |
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28 http://www.sgi.com |
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29 |
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30 For further information regarding this notice, see: |
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31 |
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32 http://oss.sgi.com/projects/GenInfo/NoticeExplan |
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33 |
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34 */ |
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35 |
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36 |
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37 |
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38 #include "config.h" |
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39 #include "libdwarfdefs.h" |
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40 #include <stdio.h> |
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41 #include <string.h> |
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42 #ifdef HAVE_ELFACCESS_H |
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43 #include <elfaccess.h> |
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44 #endif |
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45 #include "pro_incl.h" |
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46 #include "pro_arange.h" |
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47 #include "pro_section.h" |
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48 #include "pro_reloc.h" |
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49 |
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50 |
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51 |
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52 /* |
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53 This function adds another address range |
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54 to the list of address ranges for the |
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55 given Dwarf_P_Debug. It returns 0 on error, |
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56 and 1 otherwise. |
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57 */ |
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58 Dwarf_Unsigned |
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59 dwarf_add_arange(Dwarf_P_Debug dbg, |
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60 Dwarf_Addr begin_address, |
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61 Dwarf_Unsigned length, |
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62 Dwarf_Signed symbol_index, Dwarf_Error * error) |
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63 { |
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64 return dwarf_add_arange_b(dbg, begin_address, length, symbol_index, |
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65 /* end_symbol_index */ 0, |
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66 /* offset_from_end_sym */ 0, |
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67 error); |
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68 } |
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69 |
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70 /* |
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71 This function adds another address range |
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72 to the list of address ranges for the |
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73 given Dwarf_P_Debug. It returns 0 on error, |
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74 and 1 otherwise. |
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75 */ |
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76 Dwarf_Unsigned |
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77 dwarf_add_arange_b(Dwarf_P_Debug dbg, |
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78 Dwarf_Addr begin_address, |
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79 Dwarf_Unsigned length, |
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80 Dwarf_Unsigned symbol_index, |
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81 Dwarf_Unsigned end_symbol_index, |
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82 Dwarf_Addr offset_from_end_sym, Dwarf_Error * error) |
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83 { |
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84 Dwarf_P_Arange arange; |
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85 |
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86 if (dbg == NULL) { |
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87 _dwarf_p_error(NULL, error, DW_DLE_DBG_NULL); |
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88 return (0); |
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89 } |
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90 |
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91 arange = (Dwarf_P_Arange) |
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92 _dwarf_p_get_alloc(dbg, sizeof(struct Dwarf_P_Arange_s)); |
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93 if (arange == NULL) { |
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94 _dwarf_p_error(dbg, error, DW_DLE_ALLOC_FAIL); |
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95 return (0); |
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96 } |
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97 |
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98 arange->ag_begin_address = begin_address; |
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99 arange->ag_length = length; |
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100 arange->ag_symbol_index = symbol_index; |
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101 arange->ag_end_symbol_index = end_symbol_index; |
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102 arange->ag_end_symbol_offset = offset_from_end_sym; |
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103 |
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104 if (dbg->de_arange == NULL) |
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105 dbg->de_arange = dbg->de_last_arange = arange; |
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106 else { |
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107 dbg->de_last_arange->ag_next = arange; |
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108 dbg->de_last_arange = arange; |
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109 } |
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110 dbg->de_arange_count++; |
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111 |
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112 return (1); |
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113 } |
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114 |
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115 |
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116 int |
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117 _dwarf_transform_arange_to_disk(Dwarf_P_Debug dbg, Dwarf_Error * error) |
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118 { |
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119 /* Total num of bytes in .debug_aranges section. */ |
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120 Dwarf_Unsigned arange_num_bytes; |
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121 |
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122 /* |
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123 Adjustment to align the start of the actual address ranges on a |
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124 boundary aligned with twice the address size. */ |
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125 Dwarf_Small remainder; |
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126 |
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127 /* Total number of bytes excluding the length field. */ |
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128 Dwarf_Unsigned adjusted_length; |
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129 |
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130 /* Points to first byte of .debug_aranges buffer. */ |
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131 Dwarf_Small *arange; |
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132 |
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133 /* Fills in the .debug_aranges buffer. */ |
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134 Dwarf_Small *arange_ptr; |
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135 |
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136 /* Scans the list of address ranges provided by user. */ |
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137 Dwarf_P_Arange given_arange; |
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138 |
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139 /* Used to fill in 0. */ |
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140 const Dwarf_Signed big_zero = 0; |
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141 |
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142 int extension_word_size = dbg->de_64bit_extension ? 4 : 0; |
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143 int uword_size = dbg->de_offset_size; |
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144 int upointer_size = dbg->de_pointer_size; |
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145 int res; |
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146 |
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147 |
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148 /* ***** BEGIN CODE ***** */ |
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149 |
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150 /* Size of the .debug_aranges section header. */ |
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151 arange_num_bytes = extension_word_size + uword_size + /* Size |
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152 of |
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153 length |
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154 field. |
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155 */ |
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156 sizeof(Dwarf_Half) + /* Size of version field. */ |
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157 uword_size + /* Size of .debug_info offset. */ |
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158 sizeof(Dwarf_Small) + /* Size of address size field. */ |
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159 sizeof(Dwarf_Small); /* Size of segment size field. */ |
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160 |
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161 /* |
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162 Adjust the size so that the set of aranges begins on a boundary |
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163 that aligned with twice the address size. This is a Libdwarf |
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164 requirement. */ |
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165 remainder = arange_num_bytes % (2 * upointer_size); |
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166 if (remainder != 0) |
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167 arange_num_bytes += (2 * upointer_size) - remainder; |
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168 |
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169 |
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170 /* Add the bytes for the actual address ranges. */ |
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171 arange_num_bytes += upointer_size * 2 * (dbg->de_arange_count + 1); |
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172 |
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173 GET_CHUNK(dbg, dbg->de_elf_sects[DEBUG_ARANGES], |
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174 arange, (unsigned long) arange_num_bytes, error); |
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175 arange_ptr = arange; |
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176 if (arange == NULL) { |
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177 _dwarf_p_error(dbg, error, DW_DLE_ALLOC_FAIL); |
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178 return (0); |
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179 } |
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180 if (extension_word_size) { |
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181 Dwarf_Word x = DISTINGUISHED_VALUE; |
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182 |
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183 WRITE_UNALIGNED(dbg, (void *) arange_ptr, |
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184 (const void *) &x, |
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185 sizeof(x), extension_word_size); |
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186 arange_ptr += extension_word_size; |
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187 } |
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188 |
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189 /* Write the total length of .debug_aranges section. */ |
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190 adjusted_length = arange_num_bytes - uword_size |
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191 - extension_word_size; |
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192 { |
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193 Dwarf_Unsigned du = adjusted_length; |
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194 |
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195 WRITE_UNALIGNED(dbg, (void *) arange_ptr, |
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196 (const void *) &du, sizeof(du), uword_size); |
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197 arange_ptr += uword_size; |
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198 } |
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199 |
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200 /* Write the version as 2 bytes. */ |
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201 { |
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202 Dwarf_Half verstamp = CURRENT_VERSION_STAMP; |
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203 |
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204 WRITE_UNALIGNED(dbg, (void *) arange_ptr, |
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205 (const void *) &verstamp, |
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206 sizeof(verstamp), sizeof(Dwarf_Half)); |
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207 arange_ptr += sizeof(Dwarf_Half); |
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208 } |
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209 |
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210 |
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211 /* Write the .debug_info offset. This is always 0. */ |
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212 WRITE_UNALIGNED(dbg, (void *) arange_ptr, |
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213 (const void *) &big_zero, |
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214 sizeof(big_zero), uword_size); |
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215 arange_ptr += uword_size; |
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216 |
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217 { |
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218 unsigned long count = dbg->de_arange_count + 1; |
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219 int res; |
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220 |
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221 if (dbg->de_reloc_pair) { |
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222 count = (3 * dbg->de_arange_count) + 1; |
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223 } |
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224 /* the following is a small optimization: not needed for |
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225 correctness */ |
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226 res = _dwarf_pro_pre_alloc_n_reloc_slots(dbg, |
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227 DEBUG_ARANGES, count); |
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228 if (res != DW_DLV_OK) { |
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229 { |
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230 _dwarf_p_error(dbg, error, DW_DLE_ALLOC_FAIL); |
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231 return (0); |
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232 } |
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233 } |
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234 } |
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235 |
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236 /* reloc for .debug_info */ |
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237 res = dbg->de_reloc_name(dbg, |
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238 DEBUG_ARANGES, |
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239 extension_word_size + |
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240 uword_size + sizeof(Dwarf_Half), |
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241 dbg->de_sect_name_idx[DEBUG_INFO], |
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242 dwarf_drt_data_reloc, uword_size); |
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243 |
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244 /* Write the size of addresses. */ |
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245 *arange_ptr = dbg->de_pointer_size; |
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246 arange_ptr++; |
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247 |
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248 /* |
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249 Write the size of segment addresses. This is zero for MIPS |
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250 architectures. */ |
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251 *arange_ptr = 0; |
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252 arange_ptr++; |
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253 |
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254 /* |
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255 Skip over the padding to align the start of the actual address |
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256 ranges to twice the address size. */ |
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257 if (remainder != 0) |
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258 arange_ptr += (2 * upointer_size) - remainder; |
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259 |
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260 |
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261 |
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262 |
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263 |
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264 /* The arange address, length are pointer-size fields of the target |
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265 machine. */ |
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266 for (given_arange = dbg->de_arange; given_arange != NULL; |
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267 given_arange = given_arange->ag_next) { |
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268 |
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269 /* Write relocation record for beginning of address range. */ |
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270 res = dbg->de_reloc_name(dbg, DEBUG_ARANGES, arange_ptr - arange, /* r_offset |
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271 */ |
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272 (long) given_arange->ag_symbol_index, |
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273 dwarf_drt_data_reloc, upointer_size); |
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274 if (res != DW_DLV_OK) { |
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275 { |
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276 _dwarf_p_error(dbg, error, DW_DLE_ALLOC_FAIL); |
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277 return (0); |
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278 } |
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279 } |
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280 |
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281 /* Copy beginning address of range. */ |
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282 WRITE_UNALIGNED(dbg, (void *) arange_ptr, |
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283 (const void *) &given_arange->ag_begin_address, |
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284 sizeof(given_arange->ag_begin_address), |
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285 upointer_size); |
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286 arange_ptr += upointer_size; |
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287 |
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288 if (dbg->de_reloc_pair && |
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289 given_arange->ag_end_symbol_index != 0 && |
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290 given_arange->ag_length == 0) { |
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291 /* symbolic reloc, need reloc for length What if we really |
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292 know the length? If so, should use the other part of |
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293 'if'. */ |
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294 Dwarf_Unsigned val; |
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295 |
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296 res = dbg->de_reloc_pair(dbg, DEBUG_ARANGES, arange_ptr - arange, /* r_offset |
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297 */ |
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298 given_arange->ag_symbol_index, |
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299 given_arange->ag_end_symbol_index, |
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300 dwarf_drt_first_of_length_pair, |
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301 upointer_size); |
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302 if (res != DW_DLV_OK) { |
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303 { |
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304 _dwarf_p_error(dbg, error, DW_DLE_ALLOC_FAIL); |
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305 return (0); |
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306 } |
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307 } |
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308 |
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309 /* arrange pre-calc so assem text can do .word end - begin |
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310 + val (gets val from stream) */ |
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311 val = given_arange->ag_end_symbol_offset - |
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312 given_arange->ag_begin_address; |
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313 WRITE_UNALIGNED(dbg, (void *) arange_ptr, |
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314 (const void *) &val, |
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315 sizeof(val), upointer_size); |
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316 arange_ptr += upointer_size; |
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317 |
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318 } else { |
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319 /* plain old length to copy, no relocation at all */ |
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320 WRITE_UNALIGNED(dbg, (void *) arange_ptr, |
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321 (const void *) &given_arange->ag_length, |
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322 sizeof(given_arange->ag_length), |
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323 upointer_size); |
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324 arange_ptr += upointer_size; |
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325 } |
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326 } |
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327 |
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328 WRITE_UNALIGNED(dbg, (void *) arange_ptr, |
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329 (const void *) &big_zero, |
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330 sizeof(big_zero), upointer_size); |
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331 |
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332 arange_ptr += upointer_size; |
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333 WRITE_UNALIGNED(dbg, (void *) arange_ptr, |
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334 (const void *) &big_zero, |
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335 sizeof(big_zero), upointer_size); |
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336 return (int) dbg->de_n_debug_sect; |
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337 } |