Mercurial > hg > truffle
annotate agent/src/os/linux/symtab.c @ 1294:7de45b5044c3
6932270: Allow Java's ELF symtab reader to use separate debuginfo files
Reviewed-by: never
Contributed-by: Andrew Haley <aph@redhat.com>
author | never |
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date | Tue, 09 Mar 2010 11:02:39 -0800 |
parents | a61af66fc99e |
children | c18cbe5936b8 |
rev | line source |
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0 | 1 /* |
2 * Copyright 2003-2005 Sun Microsystems, Inc. All Rights Reserved. | |
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. | |
4 * | |
5 * This code is free software; you can redistribute it and/or modify it | |
6 * under the terms of the GNU General Public License version 2 only, as | |
7 * published by the Free Software Foundation. | |
8 * | |
9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
12 * version 2 for more details (a copy is included in the LICENSE file that | |
13 * accompanied this code). | |
14 * | |
15 * You should have received a copy of the GNU General Public License version | |
16 * 2 along with this work; if not, write to the Free Software Foundation, | |
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
18 * | |
19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, | |
20 * CA 95054 USA or visit www.sun.com if you need additional information or | |
21 * have any questions. | |
22 * | |
23 */ | |
24 | |
25 #include <unistd.h> | |
26 #include <sys/procfs.h> | |
27 #include <search.h> | |
28 #include <stdlib.h> | |
29 #include <string.h> | |
30 #include "symtab.h" | |
31 #include "salibelf.h" | |
32 | |
33 | |
34 // ---------------------------------------------------- | |
35 // functions for symbol lookups | |
36 // ---------------------------------------------------- | |
37 | |
38 struct elf_section { | |
39 ELF_SHDR *c_shdr; | |
40 void *c_data; | |
41 }; | |
42 | |
43 struct elf_symbol { | |
44 char *name; | |
45 uintptr_t offset; | |
46 uintptr_t size; | |
47 }; | |
48 | |
49 typedef struct symtab { | |
50 char *strs; | |
51 size_t num_symbols; | |
52 struct elf_symbol *symbols; | |
53 struct hsearch_data *hash_table; | |
54 } symtab_t; | |
55 | |
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56 |
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57 // Directory that contains global debuginfo files. In theory it |
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58 // should be possible to change this, but in a Java environment there |
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59 // is no obvious place to put a user interface to do it. Maybe this |
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60 // could be set with an environment variable. |
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61 static const char debug_file_directory[] = "/usr/lib/debug"; |
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62 |
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63 /* The CRC used in gnu_debuglink, retrieved from |
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64 http://sourceware.org/gdb/current/onlinedocs/gdb/Separate-Debug-Files.html#Separate-Debug-Files. */ |
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65 unsigned int gnu_debuglink_crc32 (unsigned int crc, |
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66 unsigned char *buf, size_t len) |
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67 { |
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68 static const unsigned int crc32_table[256] = |
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69 { |
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70 0x00000000, 0x77073096, 0xee0e612c, 0x990951ba, 0x076dc419, |
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71 0x706af48f, 0xe963a535, 0x9e6495a3, 0x0edb8832, 0x79dcb8a4, |
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72 0xe0d5e91e, 0x97d2d988, 0x09b64c2b, 0x7eb17cbd, 0xe7b82d07, |
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73 0x90bf1d91, 0x1db71064, 0x6ab020f2, 0xf3b97148, 0x84be41de, |
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74 0x1adad47d, 0x6ddde4eb, 0xf4d4b551, 0x83d385c7, 0x136c9856, |
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75 0x646ba8c0, 0xfd62f97a, 0x8a65c9ec, 0x14015c4f, 0x63066cd9, |
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76 0xfa0f3d63, 0x8d080df5, 0x3b6e20c8, 0x4c69105e, 0xd56041e4, |
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77 0xa2677172, 0x3c03e4d1, 0x4b04d447, 0xd20d85fd, 0xa50ab56b, |
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78 0x35b5a8fa, 0x42b2986c, 0xdbbbc9d6, 0xacbcf940, 0x32d86ce3, |
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79 0x45df5c75, 0xdcd60dcf, 0xabd13d59, 0x26d930ac, 0x51de003a, |
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80 0xc8d75180, 0xbfd06116, 0x21b4f4b5, 0x56b3c423, 0xcfba9599, |
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81 0xb8bda50f, 0x2802b89e, 0x5f058808, 0xc60cd9b2, 0xb10be924, |
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82 0x2f6f7c87, 0x58684c11, 0xc1611dab, 0xb6662d3d, 0x76dc4190, |
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83 0x01db7106, 0x98d220bc, 0xefd5102a, 0x71b18589, 0x06b6b51f, |
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84 0x9fbfe4a5, 0xe8b8d433, 0x7807c9a2, 0x0f00f934, 0x9609a88e, |
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85 0xe10e9818, 0x7f6a0dbb, 0x086d3d2d, 0x91646c97, 0xe6635c01, |
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86 0x6b6b51f4, 0x1c6c6162, 0x856530d8, 0xf262004e, 0x6c0695ed, |
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87 0x1b01a57b, 0x8208f4c1, 0xf50fc457, 0x65b0d9c6, 0x12b7e950, |
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88 0x8bbeb8ea, 0xfcb9887c, 0x62dd1ddf, 0x15da2d49, 0x8cd37cf3, |
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89 0xfbd44c65, 0x4db26158, 0x3ab551ce, 0xa3bc0074, 0xd4bb30e2, |
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90 0x4adfa541, 0x3dd895d7, 0xa4d1c46d, 0xd3d6f4fb, 0x4369e96a, |
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91 0x346ed9fc, 0xad678846, 0xda60b8d0, 0x44042d73, 0x33031de5, |
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92 0xaa0a4c5f, 0xdd0d7cc9, 0x5005713c, 0x270241aa, 0xbe0b1010, |
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93 0xc90c2086, 0x5768b525, 0x206f85b3, 0xb966d409, 0xce61e49f, |
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94 0x5edef90e, 0x29d9c998, 0xb0d09822, 0xc7d7a8b4, 0x59b33d17, |
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95 0x2eb40d81, 0xb7bd5c3b, 0xc0ba6cad, 0xedb88320, 0x9abfb3b6, |
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96 0x03b6e20c, 0x74b1d29a, 0xead54739, 0x9dd277af, 0x04db2615, |
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97 0x73dc1683, 0xe3630b12, 0x94643b84, 0x0d6d6a3e, 0x7a6a5aa8, |
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98 0xe40ecf0b, 0x9309ff9d, 0x0a00ae27, 0x7d079eb1, 0xf00f9344, |
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99 0x8708a3d2, 0x1e01f268, 0x6906c2fe, 0xf762575d, 0x806567cb, |
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100 0x196c3671, 0x6e6b06e7, 0xfed41b76, 0x89d32be0, 0x10da7a5a, |
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101 0x67dd4acc, 0xf9b9df6f, 0x8ebeeff9, 0x17b7be43, 0x60b08ed5, |
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102 0xd6d6a3e8, 0xa1d1937e, 0x38d8c2c4, 0x4fdff252, 0xd1bb67f1, |
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103 0xa6bc5767, 0x3fb506dd, 0x48b2364b, 0xd80d2bda, 0xaf0a1b4c, |
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104 0x36034af6, 0x41047a60, 0xdf60efc3, 0xa867df55, 0x316e8eef, |
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105 0x4669be79, 0xcb61b38c, 0xbc66831a, 0x256fd2a0, 0x5268e236, |
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106 0xcc0c7795, 0xbb0b4703, 0x220216b9, 0x5505262f, 0xc5ba3bbe, |
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107 0xb2bd0b28, 0x2bb45a92, 0x5cb36a04, 0xc2d7ffa7, 0xb5d0cf31, |
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108 0x2cd99e8b, 0x5bdeae1d, 0x9b64c2b0, 0xec63f226, 0x756aa39c, |
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109 0x026d930a, 0x9c0906a9, 0xeb0e363f, 0x72076785, 0x05005713, |
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110 0x95bf4a82, 0xe2b87a14, 0x7bb12bae, 0x0cb61b38, 0x92d28e9b, |
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111 0xe5d5be0d, 0x7cdcefb7, 0x0bdbdf21, 0x86d3d2d4, 0xf1d4e242, |
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112 0x68ddb3f8, 0x1fda836e, 0x81be16cd, 0xf6b9265b, 0x6fb077e1, |
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113 0x18b74777, 0x88085ae6, 0xff0f6a70, 0x66063bca, 0x11010b5c, |
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114 0x8f659eff, 0xf862ae69, 0x616bffd3, 0x166ccf45, 0xa00ae278, |
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115 0xd70dd2ee, 0x4e048354, 0x3903b3c2, 0xa7672661, 0xd06016f7, |
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116 0x4969474d, 0x3e6e77db, 0xaed16a4a, 0xd9d65adc, 0x40df0b66, |
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117 0x37d83bf0, 0xa9bcae53, 0xdebb9ec5, 0x47b2cf7f, 0x30b5ffe9, |
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118 0xbdbdf21c, 0xcabac28a, 0x53b39330, 0x24b4a3a6, 0xbad03605, |
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119 0xcdd70693, 0x54de5729, 0x23d967bf, 0xb3667a2e, 0xc4614ab8, |
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120 0x5d681b02, 0x2a6f2b94, 0xb40bbe37, 0xc30c8ea1, 0x5a05df1b, |
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121 0x2d02ef8d |
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122 }; |
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123 unsigned char *end; |
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124 |
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125 crc = ~crc & 0xffffffff; |
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126 for (end = buf + len; buf < end; ++buf) |
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127 crc = crc32_table[(crc ^ *buf) & 0xff] ^ (crc >> 8); |
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128 return ~crc & 0xffffffff; |
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129 } |
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130 |
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131 /* Open a debuginfo file and check its CRC. If it exists and the CRC |
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132 matches return its fd. */ |
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133 static int |
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134 open_debug_file (const char *pathname, unsigned int crc) |
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135 { |
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136 unsigned int file_crc = 0; |
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137 unsigned char buffer[8 * 1024]; |
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138 |
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139 int fd = pathmap_open(pathname); |
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140 |
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141 if (fd < 0) |
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142 return -1; |
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143 |
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144 lseek(fd, 0, SEEK_SET); |
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145 |
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146 for (;;) { |
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147 int len = read(fd, buffer, sizeof buffer); |
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148 if (len <= 0) |
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149 break; |
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150 file_crc = gnu_debuglink_crc32(file_crc, buffer, len); |
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151 } |
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152 |
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153 if (crc == file_crc) |
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154 return fd; |
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155 else { |
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156 close(fd); |
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157 return -1; |
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158 } |
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159 } |
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160 |
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161 /* Find an ELF section. */ |
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162 static struct elf_section *find_section_by_name(char *name, |
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163 int fd, |
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164 ELF_EHDR *ehdr, |
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165 ELF_SHDR *shbuf, |
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166 struct elf_section *scn_cache) |
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167 { |
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168 ELF_SHDR* cursct = NULL; |
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169 char *strtab; |
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170 int cnt; |
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171 |
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172 if (scn_cache[ehdr->e_shstrndx].c_data == NULL) { |
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173 if ((scn_cache[ehdr->e_shstrndx].c_data |
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174 = read_section_data(fd, ehdr, cursct)) == NULL) { |
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175 return NULL; |
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176 } |
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177 } |
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178 |
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179 strtab = scn_cache[ehdr->e_shstrndx].c_data; |
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180 |
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181 for (cursct = shbuf, cnt = 0; |
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182 cnt < ehdr->e_shnum; |
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183 cnt++, cursct++) { |
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184 if (strcmp(cursct->sh_name + strtab, name) == 0) { |
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185 scn_cache[cnt].c_data = read_section_data(fd, ehdr, cursct); |
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186 return &scn_cache[cnt]; |
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187 } |
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188 } |
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189 |
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190 return NULL; |
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191 } |
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192 |
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193 /* Look for a ".gnu_debuglink" section. If one exists, try to open a |
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194 suitable debuginfo file. */ |
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195 static int open_file_from_debug_link(const char *name, |
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196 int fd, |
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197 ELF_EHDR *ehdr, |
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198 ELF_SHDR *shbuf, |
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199 struct elf_section *scn_cache) |
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200 { |
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201 int debug_fd; |
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202 struct elf_section *debug_link = find_section_by_name(".gnu_debuglink", fd, ehdr, |
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203 shbuf, scn_cache); |
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204 if (debug_link == NULL) |
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205 return -1; |
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206 char *debug_filename = debug_link->c_data; |
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207 int offset = (strlen(debug_filename) + 4) >> 2; |
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208 static unsigned int crc; |
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209 crc = ((unsigned int*)debug_link->c_data)[offset]; |
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210 char *debug_pathname = malloc(strlen(debug_filename) |
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211 + strlen(name) |
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212 + strlen(".debug/") |
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213 + strlen(debug_file_directory) |
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214 + 2); |
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215 strcpy(debug_pathname, name); |
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216 char *last_slash = strrchr(debug_pathname, '/'); |
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217 if (last_slash == NULL) |
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218 return -1; |
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219 |
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220 /* Look in the same directory as the object. */ |
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221 strcpy(last_slash+1, debug_filename); |
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222 |
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223 debug_fd = open_debug_file(debug_pathname, crc); |
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224 if (debug_fd >= 0) { |
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225 free(debug_pathname); |
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226 return debug_fd; |
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227 } |
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228 |
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229 /* Look in a subdirectory named ".debug". */ |
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230 strcpy(last_slash+1, ".debug/"); |
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231 strcat(last_slash, debug_filename); |
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232 |
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233 debug_fd = open_debug_file(debug_pathname, crc); |
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234 if (debug_fd >= 0) { |
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235 free(debug_pathname); |
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236 return debug_fd; |
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237 } |
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238 |
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239 /* Look in /usr/lib/debug + the full pathname. */ |
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240 strcpy(debug_pathname, debug_file_directory); |
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241 strcat(debug_pathname, name); |
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242 last_slash = strrchr(debug_pathname, '/'); |
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243 strcpy(last_slash+1, debug_filename); |
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244 |
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245 debug_fd = open_debug_file(debug_pathname, crc); |
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246 if (debug_fd >= 0) { |
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247 free(debug_pathname); |
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248 return debug_fd; |
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249 } |
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250 |
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251 free(debug_pathname); |
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252 return -1; |
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253 } |
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254 |
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255 static struct symtab* build_symtab_internal(int fd, const char *filename, bool try_debuginfo); |
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256 |
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257 /* Look for a ".gnu_debuglink" section. If one exists, try to open a |
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258 suitable debuginfo file and read a symbol table from it. */ |
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259 static struct symtab *build_symtab_from_debug_link(const char *name, |
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260 int fd, |
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261 ELF_EHDR *ehdr, |
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262 ELF_SHDR *shbuf, |
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263 struct elf_section *scn_cache) |
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264 { |
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265 fd = open_file_from_debug_link(name, fd, ehdr, shbuf, scn_cache); |
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266 |
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267 if (fd >= 0) { |
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268 struct symtab *symtab = build_symtab_internal(fd, NULL, /* try_debuginfo */ false); |
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269 close(fd); |
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270 return symtab; |
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271 } |
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272 |
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273 return NULL; |
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274 } |
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275 |
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276 // Given a build_id, find the associated debuginfo file |
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277 static char * |
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278 build_id_to_debug_filename (size_t size, unsigned char *data) |
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279 { |
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280 char *filename, *s; |
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281 |
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282 filename = malloc(strlen (debug_file_directory) + (sizeof "/.build-id/" - 1) + 1 |
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283 + 2 * size + (sizeof ".debug" - 1) + 1); |
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284 s = filename + sprintf (filename, "%s/.build-id/", debug_file_directory); |
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285 if (size > 0) |
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286 { |
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287 size--; |
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288 s += sprintf (s, "%02x", *data++); |
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289 } |
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290 if (size > 0) |
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291 *s++ = '/'; |
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292 while (size-- > 0) |
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293 s += sprintf (s, "%02x", *data++); |
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294 strcpy (s, ".debug"); |
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295 |
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296 return filename; |
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297 } |
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298 |
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299 // Read a build ID note. Try to open any associated debuginfo file |
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300 // and return its symtab |
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301 static struct symtab* build_symtab_from_build_id(Elf64_Nhdr *note) |
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302 { |
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303 int fd; |
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304 struct symtab *symtab = NULL; |
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305 |
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306 unsigned char *bytes |
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307 = (unsigned char*)(note+1) + note->n_namesz; |
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308 unsigned char *filename |
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309 = (build_id_to_debug_filename (note->n_descsz, bytes)); |
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310 |
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311 fd = pathmap_open(filename); |
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312 if (fd >= 0) { |
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313 symtab = build_symtab_internal(fd, NULL, /* try_debuginfo */ false); |
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314 close(fd); |
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315 } |
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316 free(filename); |
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317 |
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318 return symtab; |
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319 } |
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320 |
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321 // read symbol table from given fd. If try_debuginfo) is true, also |
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322 // try to open an associated debuginfo file |
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323 static struct symtab* build_symtab_internal(int fd, const char *filename, bool try_debuginfo) { |
0 | 324 ELF_EHDR ehdr; |
325 char *names = NULL; | |
326 struct symtab* symtab = NULL; | |
327 | |
328 // Reading of elf header | |
329 struct elf_section *scn_cache = NULL; | |
330 int cnt = 0; | |
331 ELF_SHDR* shbuf = NULL; | |
332 ELF_SHDR* cursct = NULL; | |
333 ELF_PHDR* phbuf = NULL; | |
334 ELF_PHDR* phdr = NULL; | |
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335 int sym_section = SHT_DYNSYM; |
0 | 336 |
337 uintptr_t baseaddr = (uintptr_t)-1; | |
338 | |
339 lseek(fd, (off_t)0L, SEEK_SET); | |
340 if (! read_elf_header(fd, &ehdr)) { | |
341 // not an elf | |
342 return NULL; | |
343 } | |
344 | |
345 // read ELF header | |
346 if ((shbuf = read_section_header_table(fd, &ehdr)) == NULL) { | |
347 goto quit; | |
348 } | |
349 | |
350 baseaddr = find_base_address(fd, &ehdr); | |
351 | |
352 scn_cache = (struct elf_section *) | |
353 calloc(ehdr.e_shnum * sizeof(struct elf_section), 1); | |
354 if (scn_cache == NULL) { | |
355 goto quit; | |
356 } | |
357 | |
358 for (cursct = shbuf, cnt = 0; cnt < ehdr.e_shnum; cnt++) { | |
359 scn_cache[cnt].c_shdr = cursct; | |
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360 if (cursct->sh_type == SHT_SYMTAB || cursct->sh_type == SHT_STRTAB |
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361 || cursct->sh_type == SHT_NOTE || cursct->sh_type == SHT_DYNSYM) { |
0 | 362 if ( (scn_cache[cnt].c_data = read_section_data(fd, &ehdr, cursct)) == NULL) { |
363 goto quit; | |
364 } | |
365 } | |
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366 if (cursct->sh_type == SHT_SYMTAB) { |
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367 // Full symbol table available so use that |
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368 sym_section = cursct->sh_type; |
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369 } |
0 | 370 cursct++; |
371 } | |
372 | |
373 for (cnt = 1; cnt < ehdr.e_shnum; cnt++) { | |
374 ELF_SHDR *shdr = scn_cache[cnt].c_shdr; | |
375 | |
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376 if (shdr->sh_type == sym_section) { |
0 | 377 ELF_SYM *syms; |
378 int j, n, rslt; | |
379 size_t size; | |
380 | |
381 // FIXME: there could be multiple data buffers associated with the | |
382 // same ELF section. Here we can handle only one buffer. See man page | |
383 // for elf_getdata on Solaris. | |
384 | |
385 // guarantee(symtab == NULL, "multiple symtab"); | |
386 symtab = (struct symtab*)calloc(1, sizeof(struct symtab)); | |
387 if (symtab == NULL) { | |
388 goto quit; | |
389 } | |
390 // the symbol table | |
391 syms = (ELF_SYM *)scn_cache[cnt].c_data; | |
392 | |
393 // number of symbols | |
394 n = shdr->sh_size / shdr->sh_entsize; | |
395 | |
396 // create hash table, we use hcreate_r, hsearch_r and hdestroy_r to | |
397 // manipulate the hash table. | |
398 symtab->hash_table = (struct hsearch_data*) calloc(1, sizeof(struct hsearch_data)); | |
399 rslt = hcreate_r(n, symtab->hash_table); | |
400 // guarantee(rslt, "unexpected failure: hcreate_r"); | |
401 | |
402 // shdr->sh_link points to the section that contains the actual strings | |
403 // for symbol names. the st_name field in ELF_SYM is just the | |
404 // string table index. we make a copy of the string table so the | |
405 // strings will not be destroyed by elf_end. | |
406 size = scn_cache[shdr->sh_link].c_shdr->sh_size; | |
407 symtab->strs = (char *)malloc(size); | |
408 memcpy(symtab->strs, scn_cache[shdr->sh_link].c_data, size); | |
409 | |
410 // allocate memory for storing symbol offset and size; | |
411 symtab->num_symbols = n; | |
412 symtab->symbols = (struct elf_symbol *)calloc(n , sizeof(struct elf_symbol)); | |
413 | |
414 // copy symbols info our symtab and enter them info the hash table | |
415 for (j = 0; j < n; j++, syms++) { | |
416 ENTRY item, *ret; | |
417 char *sym_name = symtab->strs + syms->st_name; | |
418 | |
419 // skip non-object and non-function symbols | |
420 int st_type = ELF_ST_TYPE(syms->st_info); | |
421 if ( st_type != STT_FUNC && st_type != STT_OBJECT) | |
422 continue; | |
423 // skip empty strings and undefined symbols | |
424 if (*sym_name == '\0' || syms->st_shndx == SHN_UNDEF) continue; | |
425 | |
426 symtab->symbols[j].name = sym_name; | |
427 symtab->symbols[j].offset = syms->st_value - baseaddr; | |
428 symtab->symbols[j].size = syms->st_size; | |
429 | |
430 item.key = sym_name; | |
431 item.data = (void *)&(symtab->symbols[j]); | |
432 | |
433 hsearch_r(item, ENTER, &ret, symtab->hash_table); | |
434 } | |
435 } | |
436 } | |
437 | |
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438 // Look for a separate debuginfo file. |
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439 if (try_debuginfo) { |
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440 |
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441 // We prefer a debug symtab to an object's own symtab, so look in |
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442 // the debuginfo file. We stash a copy of the old symtab in case |
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443 // there is no debuginfo. |
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444 struct symtab* prev_symtab = symtab; |
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445 symtab = NULL; |
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446 |
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447 #ifdef NT_GNU_BUILD_ID |
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448 // First we look for a Build ID |
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449 for (cursct = shbuf, cnt = 0; |
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450 symtab == NULL && cnt < ehdr.e_shnum; |
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451 cnt++) { |
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452 if (cursct->sh_type == SHT_NOTE) { |
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453 Elf64_Nhdr *note = (Elf64_Nhdr *)scn_cache[cnt].c_data; |
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454 if (note->n_type == NT_GNU_BUILD_ID) { |
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455 symtab = build_symtab_from_build_id(note); |
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456 } |
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457 } |
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458 cursct++; |
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459 } |
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460 #endif |
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461 |
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462 // Then, if that doesn't work, the debug link |
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463 if (symtab == NULL) { |
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464 symtab = build_symtab_from_debug_link(filename, fd, &ehdr, shbuf, |
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465 scn_cache); |
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466 } |
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467 |
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468 // If we still haven't found a symtab, use the object's own symtab. |
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469 if (symtab != NULL) { |
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470 if (prev_symtab != NULL) |
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471 destroy_symtab(prev_symtab); |
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472 } else { |
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473 symtab = prev_symtab; |
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474 } |
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475 } |
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476 |
0 | 477 quit: |
478 if (shbuf) free(shbuf); | |
479 if (phbuf) free(phbuf); | |
480 if (scn_cache) { | |
481 for (cnt = 0; cnt < ehdr.e_shnum; cnt++) { | |
482 if (scn_cache[cnt].c_data != NULL) { | |
483 free(scn_cache[cnt].c_data); | |
484 } | |
485 } | |
486 free(scn_cache); | |
487 } | |
488 return symtab; | |
489 } | |
490 | |
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491 struct symtab* build_symtab(int fd, const char *filename) { |
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492 return build_symtab_internal(fd, filename, /* try_debuginfo */ true); |
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493 } |
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494 |
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495 |
0 | 496 void destroy_symtab(struct symtab* symtab) { |
497 if (!symtab) return; | |
498 if (symtab->strs) free(symtab->strs); | |
499 if (symtab->symbols) free(symtab->symbols); | |
500 if (symtab->hash_table) { | |
501 hdestroy_r(symtab->hash_table); | |
502 free(symtab->hash_table); | |
503 } | |
504 free(symtab); | |
505 } | |
506 | |
507 uintptr_t search_symbol(struct symtab* symtab, uintptr_t base, | |
508 const char *sym_name, int *sym_size) { | |
509 ENTRY item; | |
510 ENTRY* ret = NULL; | |
511 | |
512 // library does not have symbol table | |
513 if (!symtab || !symtab->hash_table) | |
514 return (uintptr_t)NULL; | |
515 | |
516 item.key = (char*) strdup(sym_name); | |
517 hsearch_r(item, FIND, &ret, symtab->hash_table); | |
518 if (ret) { | |
519 struct elf_symbol * sym = (struct elf_symbol *)(ret->data); | |
520 uintptr_t rslt = (uintptr_t) ((char*)base + sym->offset); | |
521 if (sym_size) *sym_size = sym->size; | |
522 free(item.key); | |
523 return rslt; | |
524 } | |
525 | |
526 quit: | |
527 free(item.key); | |
528 return (uintptr_t) NULL; | |
529 } | |
530 | |
531 const char* nearest_symbol(struct symtab* symtab, uintptr_t offset, | |
532 uintptr_t* poffset) { | |
533 int n = 0; | |
534 if (!symtab) return NULL; | |
535 for (; n < symtab->num_symbols; n++) { | |
536 struct elf_symbol* sym = &(symtab->symbols[n]); | |
537 if (sym->name != NULL && | |
538 offset >= sym->offset && offset < sym->offset + sym->size) { | |
539 if (poffset) *poffset = (offset - sym->offset); | |
540 return sym->name; | |
541 } | |
542 } | |
543 return NULL; | |
544 } |