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1 /* |
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2 |
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3 Copyright (C) 2000,2002,2004,2005 Silicon Graphics, Inc. All Rights Reserved. |
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4 Portions Copyright (C) 2007 David Anderson. All Rights Reserved. |
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5 |
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6 This program is free software; you can redistribute it and/or modify it |
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7 under the terms of version 2.1 of the GNU Lesser General Public License |
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8 as published by the Free Software Foundation. |
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9 |
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10 This program is distributed in the hope that it would be useful, but |
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11 WITHOUT ANY WARRANTY; without even the implied warranty of |
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12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. |
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13 |
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14 Further, this software is distributed without any warranty that it is |
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15 free of the rightful claim of any third person regarding infringement |
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16 or the like. Any license provided herein, whether implied or |
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17 otherwise, applies only to this software file. Patent licenses, if |
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18 any, provided herein do not apply to combinations of this program with |
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19 other software, or any other product whatsoever. |
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20 |
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21 You should have received a copy of the GNU Lesser General Public |
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22 License along with this program; if not, write the Free Software |
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23 Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston MA 02110-1301, |
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24 USA. |
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25 |
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26 Contact information: Silicon Graphics, Inc., 1500 Crittenden Lane, |
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27 Mountain View, CA 94043, or: |
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28 |
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29 http://www.sgi.com |
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30 |
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31 For further information regarding this notice, see: |
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32 |
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33 http://oss.sgi.com/projects/GenInfo/NoticeExplan |
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34 |
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35 */ |
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36 /* The address of the Free Software Foundation is |
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37 Free Software Foundation, Inc., 51 Franklin St, Fifth Floor, |
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38 Boston, MA 02110-1301, USA. |
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39 SGI has moved from the Crittenden Lane address. |
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40 */ |
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41 |
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42 |
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43 |
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44 |
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45 #include "config.h" |
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46 #include "dwarf_incl.h" |
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47 #include <stdio.h> |
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48 #include "dwarf_global.h" |
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49 |
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50 |
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51 #ifdef __sgi /* __sgi should only be defined for |
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52 IRIX/MIPS. */ |
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53 /* The 'fixup' here intended for IRIX targets only. |
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54 With a 2+GB Elf64 IRIX executable (under 4GB in size), |
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55 some DIE offsets wrongly |
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56 got the 32bit upper bit sign extended. For the cu-header |
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57 offset in the .debug_pubnames section and in the |
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58 .debug_aranges section. |
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59 the 'varp' here is a pointer to an offset into .debug_info. |
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60 We fix up the offset here if it seems advisable.. |
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61 |
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62 As of June 2005 we have identified a series of mistakes |
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63 in ldx64 that can cause this (64 bit values getting passed |
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64 thru 32-bit signed knothole). |
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65 */ |
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66 void |
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67 _dwarf_fix_up_offset_irix(Dwarf_Debug dbg, |
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68 Dwarf_Unsigned * varp, char *caller_site_name) |
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69 { |
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70 |
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71 Dwarf_Unsigned var = *varp; |
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72 |
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73 #define UPPER33 0xffffffff80000000LL |
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74 #define LOWER32 0xffffffffLL |
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75 /* Restrict the hack to the known case. Upper 32 bits erroneously |
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76 sign extended from lower 32 upper bit. */ |
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77 if ((var & UPPER33) == UPPER33) { |
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78 var &= LOWER32; |
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79 /* Apply the fix. Dreadful hack. */ |
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80 *varp = var; |
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81 } |
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82 #undef UPPER33 |
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83 #undef LOWER32 |
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84 return; |
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85 } |
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86 #endif |
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87 |
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88 |
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89 int |
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90 dwarf_get_globals(Dwarf_Debug dbg, |
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91 Dwarf_Global ** globals, |
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92 Dwarf_Signed * return_count, Dwarf_Error * error) |
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93 { |
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94 int res; |
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95 |
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96 res = |
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97 _dwarf_load_section(dbg, |
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98 dbg->de_debug_pubnames_index, |
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99 &dbg->de_debug_pubnames, error); |
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100 if (res != DW_DLV_OK) { |
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101 return res; |
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102 } |
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103 |
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104 |
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105 |
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106 return _dwarf_internal_get_pubnames_like_data(dbg, |
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107 dbg-> |
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108 de_debug_pubnames, |
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109 dbg-> |
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110 de_debug_pubnames_size, |
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111 globals, return_count, |
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112 error, |
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113 DW_DLA_GLOBAL_CONTEXT, |
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114 DW_DLA_GLOBAL, |
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115 DW_DLE_PUBNAMES_LENGTH_BAD, |
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116 DW_DLE_PUBNAMES_VERSION_ERROR); |
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117 |
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118 } |
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119 |
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120 /* Deallocating fully requires deallocating the list |
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121 and all entries. But some internal data is |
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122 not exposed, so we need a function with internal knowledge. |
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123 */ |
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124 |
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125 void |
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126 dwarf_globals_dealloc(Dwarf_Debug dbg, Dwarf_Global * dwgl, |
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127 Dwarf_Signed count) |
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128 { |
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129 _dwarf_internal_globals_dealloc(dbg, dwgl, |
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130 count, |
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131 DW_DLA_GLOBAL_CONTEXT, |
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132 DW_DLA_GLOBAL, DW_DLA_LIST); |
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133 return; |
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134 } |
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135 |
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136 void |
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137 _dwarf_internal_globals_dealloc(Dwarf_Debug dbg, Dwarf_Global * dwgl, |
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138 Dwarf_Signed count, |
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139 int context_code, |
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140 int global_code, int list_code) |
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141 { |
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142 Dwarf_Signed i; |
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143 struct Dwarf_Global_Context_s *gcp = 0; |
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144 struct Dwarf_Global_Context_s *lastgcp = 0; |
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145 |
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146 for (i = 0; i < count; i++) { |
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147 Dwarf_Global dgb = dwgl[i]; |
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148 |
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149 gcp = dgb->gl_context; |
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150 |
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151 if (lastgcp != gcp) { |
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152 lastgcp = gcp; |
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153 dwarf_dealloc(dbg, gcp, context_code); |
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154 } |
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155 dwarf_dealloc(dbg, dgb, global_code); |
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156 } |
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157 dwarf_dealloc(dbg, dwgl, list_code); |
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158 return; |
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159 } |
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160 |
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161 |
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162 /* Sweeps the complete section. |
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163 */ |
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164 int |
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165 _dwarf_internal_get_pubnames_like_data(Dwarf_Debug dbg, |
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166 Dwarf_Small * section_data_ptr, |
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167 Dwarf_Unsigned section_length, |
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168 Dwarf_Global ** globals, |
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169 Dwarf_Signed * return_count, |
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170 Dwarf_Error * error, |
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171 int context_code, |
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172 int global_code, |
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173 int length_err_num, |
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174 int version_err_num) |
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175 { |
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176 |
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177 |
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178 Dwarf_Small *pubnames_like_ptr = 0; |
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179 |
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180 |
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181 |
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182 /* |
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183 Points to the context for the current set of global names, and |
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184 contains information to identify the compilation-unit that the |
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185 set refers to. */ |
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186 Dwarf_Global_Context pubnames_context = 0; |
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187 |
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188 Dwarf_Half version = 0; |
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189 |
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190 /* |
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191 Offset from the start of compilation-unit for the current |
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192 global. */ |
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193 Dwarf_Off die_offset_in_cu = 0; |
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194 |
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195 Dwarf_Unsigned global_count = 0; |
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196 |
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197 /* Points to the current global read. */ |
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198 Dwarf_Global global = 0; |
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199 |
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200 /* |
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201 Used to chain the Dwarf_Global_s structs for creating contiguous |
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202 list of pointers to the structs. */ |
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203 Dwarf_Chain curr_chain = 0; |
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204 Dwarf_Chain prev_chain = 0; |
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205 Dwarf_Chain head_chain = 0; |
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206 |
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207 /* Points to contiguous block of Dwarf_Global's to be returned. */ |
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208 Dwarf_Global *ret_globals = 0; |
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209 |
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210 /* Temporary counter. */ |
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211 Dwarf_Unsigned i = 0; |
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212 |
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213 |
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214 |
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215 |
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216 if (dbg == NULL) { |
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217 _dwarf_error(NULL, error, DW_DLE_DBG_NULL); |
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218 return (DW_DLV_ERROR); |
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219 } |
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220 /* We will eventually need the .debug_info data. Load it now. */ |
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221 if (!dbg->de_debug_info) { |
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222 int res = _dwarf_load_debug_info(dbg, error); |
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223 |
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224 if (res != DW_DLV_OK) { |
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225 return res; |
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226 } |
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227 } |
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228 |
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229 if (section_data_ptr == NULL) { |
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230 return (DW_DLV_NO_ENTRY); |
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231 } |
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232 |
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233 pubnames_like_ptr = section_data_ptr; |
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234 do { |
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235 Dwarf_Unsigned length = 0; |
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236 int local_extension_size = 0; |
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237 int local_length_size = 0; |
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238 |
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239 /* Some compilers emit padding at the end of each cu's area. |
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240 pubnames_ptr_past_end_cu records the true area end for this |
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241 cu's data. Essentially the length in the header and the 0 |
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242 terminator of the data are redundant information. The |
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243 dwarf2/3 spec does not mention what to do if the length is |
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244 past the 0 terminator. So we take any bytes left after the 0 |
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245 as padding and ignore them. */ |
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246 Dwarf_Small *pubnames_ptr_past_end_cu = 0; |
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247 |
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248 |
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249 pubnames_context = (Dwarf_Global_Context) |
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250 _dwarf_get_alloc(dbg, context_code, 1); |
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251 if (pubnames_context == NULL) { |
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252 _dwarf_error(dbg, error, DW_DLE_ALLOC_FAIL); |
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253 return (DW_DLV_ERROR); |
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254 } |
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255 /* READ_AREA_LENGTH updates pubnames_like_ptr for consumed |
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256 bytes */ |
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257 READ_AREA_LENGTH(dbg, length, Dwarf_Unsigned, |
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258 pubnames_like_ptr, local_length_size, |
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259 local_extension_size); |
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260 pubnames_context->pu_length_size = local_length_size; |
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261 pubnames_context->pu_extension_size = local_extension_size; |
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262 pubnames_context->pu_dbg = dbg; |
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263 |
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264 pubnames_ptr_past_end_cu = pubnames_like_ptr + length; |
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265 |
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266 READ_UNALIGNED(dbg, version, Dwarf_Half, |
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267 pubnames_like_ptr, sizeof(Dwarf_Half)); |
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268 pubnames_like_ptr += sizeof(Dwarf_Half); |
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269 if (version != CURRENT_VERSION_STAMP) { |
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270 _dwarf_error(dbg, error, version_err_num); |
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271 return (DW_DLV_ERROR); |
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272 } |
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273 |
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274 /* offset of CU header in debug section */ |
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275 READ_UNALIGNED(dbg, pubnames_context->pu_offset_of_cu_header, |
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276 Dwarf_Off, pubnames_like_ptr, |
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277 pubnames_context->pu_length_size); |
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278 pubnames_like_ptr += pubnames_context->pu_length_size; |
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279 |
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280 FIX_UP_OFFSET_IRIX_BUG(dbg, |
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281 pubnames_context->pu_offset_of_cu_header, |
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282 "pubnames cu header offset"); |
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283 |
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284 |
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285 READ_UNALIGNED(dbg, pubnames_context->pu_info_length, |
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286 Dwarf_Unsigned, pubnames_like_ptr, |
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287 pubnames_context->pu_length_size); |
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288 pubnames_like_ptr += pubnames_context->pu_length_size; |
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289 |
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290 if (pubnames_like_ptr > (section_data_ptr + section_length)) { |
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291 _dwarf_error(dbg, error, length_err_num); |
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292 return (DW_DLV_ERROR); |
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293 } |
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294 |
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295 /* read initial offset (of DIE within CU) of a pubname, final |
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296 entry is not a pair, just a zero offset */ |
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297 READ_UNALIGNED(dbg, die_offset_in_cu, Dwarf_Off, |
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298 pubnames_like_ptr, |
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299 pubnames_context->pu_length_size); |
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300 pubnames_like_ptr += pubnames_context->pu_length_size; |
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301 FIX_UP_OFFSET_IRIX_BUG(dbg, |
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302 die_offset_in_cu, "offset of die in cu"); |
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303 |
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304 /* loop thru pairs. DIE off with CU followed by string */ |
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305 while (die_offset_in_cu != 0) { |
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306 |
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307 /* Already read offset, pubnames_like_ptr now points to the |
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308 string */ |
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309 global = |
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310 (Dwarf_Global) _dwarf_get_alloc(dbg, global_code, 1); |
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311 if (global == NULL) { |
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312 _dwarf_error(dbg, error, DW_DLE_ALLOC_FAIL); |
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313 return (DW_DLV_ERROR); |
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314 } |
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315 global_count++; |
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316 |
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317 global->gl_context = pubnames_context; |
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318 |
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319 global->gl_named_die_offset_within_cu = die_offset_in_cu; |
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320 |
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321 global->gl_name = pubnames_like_ptr; |
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322 |
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323 pubnames_like_ptr = pubnames_like_ptr + |
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324 strlen((char *) pubnames_like_ptr) + 1; |
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325 |
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326 |
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327 /* finish off current entry chain */ |
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328 curr_chain = |
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329 (Dwarf_Chain) _dwarf_get_alloc(dbg, DW_DLA_CHAIN, 1); |
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330 if (curr_chain == NULL) { |
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331 _dwarf_error(dbg, error, DW_DLE_ALLOC_FAIL); |
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332 return (DW_DLV_ERROR); |
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333 } |
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334 |
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335 /* Put current global on singly_linked list. */ |
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336 curr_chain->ch_item = (Dwarf_Global) global; |
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337 |
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338 if (head_chain == NULL) |
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339 head_chain = prev_chain = curr_chain; |
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340 else { |
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341 prev_chain->ch_next = curr_chain; |
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342 prev_chain = curr_chain; |
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343 } |
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344 |
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345 /* read offset for the *next* entry */ |
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346 READ_UNALIGNED(dbg, die_offset_in_cu, Dwarf_Off, |
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347 pubnames_like_ptr, |
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348 pubnames_context->pu_length_size); |
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349 |
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350 pubnames_like_ptr += pubnames_context->pu_length_size; |
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351 FIX_UP_OFFSET_IRIX_BUG(dbg, |
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352 die_offset_in_cu, |
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353 "offset of next die in cu"); |
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354 |
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355 if (pubnames_like_ptr > (section_data_ptr + section_length)) { |
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356 _dwarf_error(dbg, error, length_err_num); |
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357 return (DW_DLV_ERROR); |
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358 } |
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359 } |
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360 /* ASSERT: die_offset_in_cu == 0 */ |
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361 if (pubnames_like_ptr > pubnames_ptr_past_end_cu) { |
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362 /* This is some kind of error. This simply cannot happen. |
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363 The encoding is wrong or the length in the header for |
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364 this cu's contribution is wrong. */ |
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365 _dwarf_error(dbg, error, length_err_num); |
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366 return (DW_DLV_ERROR); |
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367 |
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368 } |
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369 /* If there is some kind of padding at the end of the section, |
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370 as emitted by some compilers, skip over that padding and |
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371 simply ignore the bytes thus passed-over. With most |
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372 compilers, pubnames_like_ptr == pubnames_ptr_past_end_cu at |
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373 this point */ |
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374 pubnames_like_ptr = pubnames_ptr_past_end_cu; |
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375 |
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376 } while (pubnames_like_ptr < (section_data_ptr + section_length)); |
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377 |
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378 /* Points to contiguous block of Dwarf_Global's. */ |
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379 ret_globals = (Dwarf_Global *) |
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380 _dwarf_get_alloc(dbg, DW_DLA_LIST, global_count); |
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381 if (ret_globals == NULL) { |
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382 _dwarf_error(dbg, error, DW_DLE_ALLOC_FAIL); |
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383 return (DW_DLV_ERROR); |
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384 } |
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385 |
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386 /* |
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387 Store pointers to Dwarf_Global_s structs in contiguous block, |
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388 and deallocate the chain. */ |
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389 curr_chain = head_chain; |
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390 for (i = 0; i < global_count; i++) { |
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391 *(ret_globals + i) = curr_chain->ch_item; |
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392 prev_chain = curr_chain; |
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393 curr_chain = curr_chain->ch_next; |
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394 dwarf_dealloc(dbg, prev_chain, DW_DLA_CHAIN); |
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395 } |
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396 |
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397 *globals = ret_globals; |
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398 *return_count = (Dwarf_Signed) global_count; |
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399 return DW_DLV_OK; |
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400 } |
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401 |
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402 |
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403 /* |
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404 Given a pubnames entry (or other like section entry) |
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405 return thru the ret_name pointer |
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406 a pointer to the string which is the entry name. |
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407 |
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408 */ |
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409 int |
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410 dwarf_globname(Dwarf_Global glob, char **ret_name, Dwarf_Error * error) |
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411 { |
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412 if (glob == NULL) { |
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413 _dwarf_error(NULL, error, DW_DLE_GLOBAL_NULL); |
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414 return (DW_DLV_ERROR); |
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415 } |
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416 |
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417 *ret_name = (char *) (glob->gl_name); |
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418 return DW_DLV_OK; |
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419 } |
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420 |
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421 |
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422 /* |
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423 Given a pubnames entry (or other like section entry) |
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424 return thru the ret_off pointer the |
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425 global offset of the DIE for this entry. |
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426 The global offset is the offset within the .debug_info |
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427 section as a whole. |
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428 */ |
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429 int |
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430 dwarf_global_die_offset(Dwarf_Global global, |
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431 Dwarf_Off * ret_off, Dwarf_Error * error) |
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432 { |
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433 if (global == NULL) { |
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434 _dwarf_error(NULL, error, DW_DLE_GLOBAL_NULL); |
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435 return (DW_DLV_ERROR); |
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436 } |
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437 |
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438 if (global->gl_context == NULL) { |
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439 _dwarf_error(NULL, error, DW_DLE_GLOBAL_CONTEXT_NULL); |
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440 return (DW_DLV_ERROR); |
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441 } |
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442 |
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443 *ret_off = (global->gl_named_die_offset_within_cu + |
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444 global->gl_context->pu_offset_of_cu_header); |
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445 return DW_DLV_OK; |
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446 } |
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447 |
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448 /* |
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449 Given a pubnames entry (or other like section entry) |
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450 return thru the ret_off pointer the |
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451 offset of the compilation unit header of the |
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452 compilation unit the global is part of. |
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453 |
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454 In early versions of this, the value returned was |
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455 the offset of the compilation unit die, and |
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456 other cu-local die offsets were faked so adding this to |
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457 such a cu-local offset got a true section offset. |
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458 Now things do as they say (adding *cu_header_offset to |
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459 a cu-local offset gets the section offset). |
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460 |
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461 */ |
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462 int |
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463 dwarf_global_cu_offset(Dwarf_Global global, |
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464 Dwarf_Off * cu_header_offset, |
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465 Dwarf_Error * error) |
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466 { |
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467 Dwarf_Global_Context con = 0; |
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468 |
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469 if (global == NULL) { |
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470 _dwarf_error(NULL, error, DW_DLE_GLOBAL_NULL); |
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471 return (DW_DLV_ERROR); |
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472 } |
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473 |
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474 con = global->gl_context; |
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475 |
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476 if (con == NULL) { |
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477 _dwarf_error(NULL, error, DW_DLE_GLOBAL_CONTEXT_NULL); |
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478 return (DW_DLV_ERROR); |
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479 } |
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480 |
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481 /* In early libdwarf, this incorrectly returned the offset of the |
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482 CU DIE. Now correctly returns the header offset. */ |
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483 *cu_header_offset = con->pu_offset_of_cu_header; |
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484 |
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485 return DW_DLV_OK; |
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486 } |
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487 |
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488 /* |
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489 Give back the pubnames entry (or any other like section) |
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490 name, symbol DIE offset, and the cu-DIE offset. |
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491 |
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492 Various errors are possible. |
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493 |
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494 The string pointer returned thru ret_name is not |
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495 dwarf_get_alloc()ed, so no dwarf_dealloc() |
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496 DW_DLA_STRING should be applied to it. |
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497 |
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498 */ |
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499 int |
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500 dwarf_global_name_offsets(Dwarf_Global global, |
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501 char **ret_name, |
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502 Dwarf_Off * die_offset, |
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503 Dwarf_Off * cu_die_offset, |
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504 Dwarf_Error * error) |
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505 { |
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506 Dwarf_Global_Context con = 0; |
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507 Dwarf_Debug dbg = 0; |
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508 Dwarf_Off off = 0; |
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509 |
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510 if (global == NULL) { |
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511 _dwarf_error(NULL, error, DW_DLE_GLOBAL_NULL); |
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512 return (DW_DLV_ERROR); |
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513 } |
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514 |
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515 con = global->gl_context; |
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516 |
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517 if (con == NULL) { |
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518 _dwarf_error(NULL, error, DW_DLE_GLOBAL_CONTEXT_NULL); |
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519 return (DW_DLV_ERROR); |
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520 } |
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521 |
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522 off = con->pu_offset_of_cu_header; |
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523 /* The offset had better not be too close to the end. If it is, |
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524 _dwarf_length_of_cu_header() will step off the end and therefore |
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525 must not be used. 10 is a meaningless heuristic, but no CU |
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526 header is that small so it is safe. An erroneous offset is due |
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527 to a bug in the tool chain. A bug like this has been seen on |
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528 IRIX with MIPSpro 7.3.1.3 and an executable > 2GB in size and |
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529 with 2 million pubnames entries. */ |
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530 #define MIN_CU_HDR_SIZE 10 |
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531 dbg = con->pu_dbg; |
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532 if (dbg == NULL) { |
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533 _dwarf_error(NULL, error, DW_DLE_DBG_NULL); |
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534 return (DW_DLV_ERROR); |
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535 } |
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536 if (dbg->de_debug_info_size && |
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537 ((off + MIN_CU_HDR_SIZE) >= dbg->de_debug_info_size)) { |
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538 _dwarf_error(NULL, error, DW_DLE_OFFSET_BAD); |
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539 return (DW_DLV_ERROR); |
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540 } |
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541 #undef MIN_CU_HDR_SIZE |
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542 if (die_offset != NULL) { |
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543 *die_offset = global->gl_named_die_offset_within_cu + off; |
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544 } |
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545 |
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546 *ret_name = (char *) global->gl_name; |
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547 |
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548 if (cu_die_offset != NULL) { |
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549 int res = _dwarf_load_debug_info(dbg, error); |
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550 |
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551 if (res != DW_DLV_OK) { |
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552 return res; |
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553 } |
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554 /* The offset had better not be too close to the end. If it is, |
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555 _dwarf_length_of_cu_header() will step off the end and |
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556 therefore must not be used. 10 is a meaningless heuristic, |
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557 but no CU header is that small so it is safe. */ |
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558 if ((off + 10) >= dbg->de_debug_info_size) { |
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559 _dwarf_error(NULL, error, DW_DLE_OFFSET_BAD); |
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560 return (DW_DLV_ERROR); |
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561 } |
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562 *cu_die_offset = off + _dwarf_length_of_cu_header(dbg, off); |
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563 } |
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564 |
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565 |
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566 return DW_DLV_OK; |
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567 } |
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568 |
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569 /* |
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570 We have the offset to a CU header. |
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571 Return thru outFileOffset the offset of the CU DIE. |
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572 |
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573 New June, 2001. |
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574 Used by SGI debuggers. |
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575 No error is possible. |
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576 */ |
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577 |
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578 /* ARGSUSED */ |
|
579 int |
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580 dwarf_get_cu_die_offset_given_cu_header_offset(Dwarf_Debug dbg, |
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581 Dwarf_Off |
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582 in_cu_header_offset, |
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583 Dwarf_Off * |
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584 out_cu_die_offset, |
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585 Dwarf_Error * err) |
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586 { |
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587 Dwarf_Off len = |
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588 _dwarf_length_of_cu_header(dbg, in_cu_header_offset); |
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589 |
|
590 Dwarf_Off newoff = in_cu_header_offset + len; |
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591 |
|
592 *out_cu_die_offset = newoff; |
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593 return DW_DLV_OK; |
|
594 } |