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6077
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1 /*
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2 * Copyright (c) 2012, Oracle and/or its affiliates. All rights reserved.
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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4 *
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5 * This code is free software; you can redistribute it and/or modify it
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6 * under the terms of the GNU General Public License version 2 only, as
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7 * published by the Free Software Foundation.
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8 *
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9 * This code is distributed in the hope that it will be useful, but WITHOUT
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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12 * version 2 for more details (a copy is included in the LICENSE file that
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13 * accompanied this code).
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14 *
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15 * You should have received a copy of the GNU General Public License version
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16 * 2 along with this work; if not, write to the Free Software Foundation,
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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18 *
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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20 * or visit www.oracle.com if you need additional information or have any
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21 * questions.
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22 *
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23 */
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24
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25 /*
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26 * Name: add_gnu_debuglink.c
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27 *
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28 * Description: Add a ".gnu_debuglink" section that refers to the specified
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29 * debug_info_path to the specified ELF object.
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30 *
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31 * This program is adapted from the example program shown on the
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32 * elf(3elf) man page and from code from the Solaris compiler
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33 * driver.
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34 */
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35
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36 /*
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37 * needed to define SHF_EXCLUDE
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38 */
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39 #define ELF_TARGET_ALL
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40
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41 #include <fcntl.h>
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42 #include <stdio.h>
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43 #include <libelf.h>
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44 #include <stdlib.h>
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45 #include <string.h>
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46 #include <unistd.h>
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47
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48 static void failure(void);
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49 static unsigned int gnu_debuglink_crc32(unsigned int crc, unsigned char *buf,
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50 size_t len);
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51
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52 void
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53 main(int argc, char ** argv) {
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54 /* new ELF section name */
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55 static char SEC_NAME[] = ".gnu_debuglink";
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56
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57 unsigned char buffer[8 * 1024]; /* I/O buffer */
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58 int buffer_len; /* buffer length */
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59 char * debug_info_path; /* debug info path */
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60 void * ehdr; /* ELF header */
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61 Elf * elf; /* ELF descriptor */
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62 char * elf_ident; /* ELF identity string */
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63 char * elf_obj; /* elf_obj file */
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64 int fd; /* descriptor for files */
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65 unsigned int file_crc = 0; /* CRC for debug info file */
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66 int is_elfclass64; /* is an ELFCLASS64 file? */
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67 Elf_Data * link_dat; /* ELF data for new debug info link */
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68 Elf_Data * name_dat; /* ELF data for new section name */
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69 Elf_Scn * new_scn; /* new ELF section descriptor */
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70 void * new_shdr; /* new ELF section header */
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71 Elf_Scn * scn; /* ELF section descriptor */
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72 void * shdr; /* ELF section header */
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73
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74 if (argc != 3) {
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75 (void) fprintf(stderr, "Usage: %s debug_info_path elf_obj\n", argv[0]);
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76 exit(2);
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77 }
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78
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79 debug_info_path = argv[1]; /* save for later */
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80 if ((fd = open(debug_info_path, O_RDONLY)) == -1) {
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81 (void) fprintf(stderr, "%s: cannot open file.\n", debug_info_path);
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82 exit(3);
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83 }
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84
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85 (void) printf("Computing CRC for '%s'\n", debug_info_path);
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86 (void) fflush(stdout);
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87 /* compute CRC for the debug info file */
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88 for (;;) {
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89 int len = read(fd, buffer, sizeof buffer);
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90 if (len <= 0) {
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91 break;
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92 }
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93 file_crc = gnu_debuglink_crc32(file_crc, buffer, len);
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94 }
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95 (void) close(fd);
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96
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97 /* open the elf_obj */
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98 elf_obj = argv[2];
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99 if ((fd = open(elf_obj, O_RDWR)) == -1) {
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100 (void) fprintf(stderr, "%s: cannot open file.\n", elf_obj);
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101 exit(4);
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102 }
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103
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104 (void) printf("Opening '%s' for update\n", elf_obj);
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105 (void) fflush(stdout);
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106 (void) elf_version(EV_CURRENT); /* coordinate ELF versions */
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107
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108 /* obtain the ELF descriptors from the input file */
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109 if ((elf = elf_begin(fd, ELF_C_RDWR, NULL)) == NULL) {
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110 failure();
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111 }
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112
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113 /* determine if ELFCLASS64 or not? */
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114 elf_ident = elf_getident(elf, NULL);
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115 is_elfclass64 = (elf_ident[EI_CLASS] == ELFCLASS64);
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116
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117 /* get the ELF header */
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118 if (is_elfclass64) {
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119 ehdr = elf64_getehdr(elf);
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120 } else {
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121 ehdr = elf32_getehdr(elf);
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122 }
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123 if (ehdr == NULL) {
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124 failure();
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125 }
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126
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127 /* get the ELF section descriptor */
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128 if (is_elfclass64) {
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129 scn = elf_getscn(elf, ((Elf64_Ehdr *) ehdr)->e_shstrndx);
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130 } else {
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131 scn = elf_getscn(elf, ((Elf32_Ehdr *) ehdr)->e_shstrndx);
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132 }
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133 if (scn == NULL) {
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134 failure();
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135 }
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136
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137 /* get the section header */
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138 if (is_elfclass64) {
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139 shdr = elf64_getshdr(scn);
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140 } else {
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141 shdr = elf32_getshdr(scn);
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142 }
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143 if (shdr == NULL) {
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144 failure();
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145 }
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146
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147 (void) printf("Adding ELF data for new section name\n");
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148 (void) fflush(stdout);
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149 name_dat = elf_newdata(scn);
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150 name_dat->d_buf = (void *) SEC_NAME;
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151 if (is_elfclass64) {
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152 name_dat->d_off = ((Elf64_Shdr *) shdr)->sh_size + 1;
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153 } else {
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154 name_dat->d_off = ((Elf32_Shdr *) shdr)->sh_size + 1;
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155 }
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156 name_dat->d_align = 1;
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157 name_dat->d_size = strlen(SEC_NAME) + 1;
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158
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159 new_scn = elf_newscn(elf);
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160
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161 if (is_elfclass64) {
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162 new_shdr = elf64_getshdr(new_scn);
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163 ((Elf64_Shdr *) new_shdr)->sh_flags = SHF_EXCLUDE;
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164 ((Elf64_Shdr *) new_shdr)->sh_type = SHT_PROGBITS;
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165 ((Elf64_Shdr *) new_shdr)->sh_name = ((Elf64_Shdr *) shdr)->sh_size;
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166 ((Elf64_Shdr *) new_shdr)->sh_addralign = 1;
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167 ((Elf64_Shdr *) shdr)->sh_size += (strlen(SEC_NAME) + 1);
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168 } else {
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169 new_shdr = elf32_getshdr(new_scn);
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170 ((Elf32_Shdr *) new_shdr)->sh_flags = SHF_EXCLUDE;
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171 ((Elf32_Shdr *) new_shdr)->sh_type = SHT_PROGBITS;
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172 ((Elf32_Shdr *) new_shdr)->sh_name = ((Elf32_Shdr *) shdr)->sh_size;
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173 ((Elf32_Shdr *) new_shdr)->sh_addralign = 1;
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174 ((Elf32_Shdr *) shdr)->sh_size += (strlen(SEC_NAME) + 1);
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175 }
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176
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177 (void) printf("Adding ELF data for debug_info_path value\n");
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178 (void) fflush(stdout);
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179 (void) memset(buffer, 0, sizeof buffer);
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180 buffer_len = strlen(debug_info_path) + 1; /* +1 for NUL */
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181 (void) strncpy((char *) buffer, debug_info_path, buffer_len);
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182 if (buffer_len % 4 != 0) {
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183 /* not on a 4 byte boundary so pad to the next one */
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184 buffer_len += (4 - buffer_len % 4);
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185 }
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186 /* save the CRC */
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187 (void) memcpy(&buffer[buffer_len], &file_crc, sizeof file_crc);
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188 buffer_len += sizeof file_crc;
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189
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190 link_dat = elf_newdata(new_scn);
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191 link_dat->d_type = ELF_T_BYTE;
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192 link_dat->d_size = buffer_len;
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193 link_dat->d_buf = buffer;
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194 link_dat->d_align = 1;
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195
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196 (void) printf("Saving updates to '%s'\n", elf_obj);
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197 (void) fflush(stdout);
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198 (void) elf_update(elf, ELF_C_NULL); /* recalc ELF memory structures */
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199 (void) elf_update(elf, ELF_C_WRITE); /* write out changes to ELF obj */
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200 (void) elf_end(elf); /* done with ELF obj */
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201 (void) close(fd);
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202
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203 (void) printf("Done updating '%s'\n", elf_obj);
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204 (void) fflush(stdout);
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205 exit(0);
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206 } /* end main */
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207
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208
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209 static void
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210 failure() {
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211 (void) fprintf(stderr, "%s\n", elf_errmsg(elf_errno()));
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212 exit(5);
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213 }
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214
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215
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216 /*
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217 * The CRC used in gnu_debuglink, retrieved from
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218 * http://sourceware.org/gdb/current/onlinedocs/gdb/Separate-Debug-Files.html#Separate-Debug-Files.
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219 */
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220
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221 static unsigned int
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222 gnu_debuglink_crc32(unsigned int crc, unsigned char *buf, size_t len) {
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223 static const unsigned int crc32_table[256] = {
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224 0x00000000, 0x77073096, 0xee0e612c, 0x990951ba, 0x076dc419,
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225 0x706af48f, 0xe963a535, 0x9e6495a3, 0x0edb8832, 0x79dcb8a4,
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226 0xe0d5e91e, 0x97d2d988, 0x09b64c2b, 0x7eb17cbd, 0xe7b82d07,
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227 0x90bf1d91, 0x1db71064, 0x6ab020f2, 0xf3b97148, 0x84be41de,
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228 0x1adad47d, 0x6ddde4eb, 0xf4d4b551, 0x83d385c7, 0x136c9856,
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229 0x646ba8c0, 0xfd62f97a, 0x8a65c9ec, 0x14015c4f, 0x63066cd9,
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230 0xfa0f3d63, 0x8d080df5, 0x3b6e20c8, 0x4c69105e, 0xd56041e4,
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231 0xa2677172, 0x3c03e4d1, 0x4b04d447, 0xd20d85fd, 0xa50ab56b,
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232 0x35b5a8fa, 0x42b2986c, 0xdbbbc9d6, 0xacbcf940, 0x32d86ce3,
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233 0x45df5c75, 0xdcd60dcf, 0xabd13d59, 0x26d930ac, 0x51de003a,
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234 0xc8d75180, 0xbfd06116, 0x21b4f4b5, 0x56b3c423, 0xcfba9599,
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235 0xb8bda50f, 0x2802b89e, 0x5f058808, 0xc60cd9b2, 0xb10be924,
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236 0x2f6f7c87, 0x58684c11, 0xc1611dab, 0xb6662d3d, 0x76dc4190,
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237 0x01db7106, 0x98d220bc, 0xefd5102a, 0x71b18589, 0x06b6b51f,
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238 0x9fbfe4a5, 0xe8b8d433, 0x7807c9a2, 0x0f00f934, 0x9609a88e,
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239 0xe10e9818, 0x7f6a0dbb, 0x086d3d2d, 0x91646c97, 0xe6635c01,
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240 0x6b6b51f4, 0x1c6c6162, 0x856530d8, 0xf262004e, 0x6c0695ed,
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241 0x1b01a57b, 0x8208f4c1, 0xf50fc457, 0x65b0d9c6, 0x12b7e950,
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242 0x8bbeb8ea, 0xfcb9887c, 0x62dd1ddf, 0x15da2d49, 0x8cd37cf3,
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243 0xfbd44c65, 0x4db26158, 0x3ab551ce, 0xa3bc0074, 0xd4bb30e2,
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244 0x4adfa541, 0x3dd895d7, 0xa4d1c46d, 0xd3d6f4fb, 0x4369e96a,
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245 0x346ed9fc, 0xad678846, 0xda60b8d0, 0x44042d73, 0x33031de5,
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246 0xaa0a4c5f, 0xdd0d7cc9, 0x5005713c, 0x270241aa, 0xbe0b1010,
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247 0xc90c2086, 0x5768b525, 0x206f85b3, 0xb966d409, 0xce61e49f,
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248 0x5edef90e, 0x29d9c998, 0xb0d09822, 0xc7d7a8b4, 0x59b33d17,
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249 0x2eb40d81, 0xb7bd5c3b, 0xc0ba6cad, 0xedb88320, 0x9abfb3b6,
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250 0x03b6e20c, 0x74b1d29a, 0xead54739, 0x9dd277af, 0x04db2615,
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251 0x73dc1683, 0xe3630b12, 0x94643b84, 0x0d6d6a3e, 0x7a6a5aa8,
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252 0xe40ecf0b, 0x9309ff9d, 0x0a00ae27, 0x7d079eb1, 0xf00f9344,
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253 0x8708a3d2, 0x1e01f268, 0x6906c2fe, 0xf762575d, 0x806567cb,
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254 0x196c3671, 0x6e6b06e7, 0xfed41b76, 0x89d32be0, 0x10da7a5a,
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255 0x67dd4acc, 0xf9b9df6f, 0x8ebeeff9, 0x17b7be43, 0x60b08ed5,
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256 0xd6d6a3e8, 0xa1d1937e, 0x38d8c2c4, 0x4fdff252, 0xd1bb67f1,
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257 0xa6bc5767, 0x3fb506dd, 0x48b2364b, 0xd80d2bda, 0xaf0a1b4c,
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258 0x36034af6, 0x41047a60, 0xdf60efc3, 0xa867df55, 0x316e8eef,
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259 0x4669be79, 0xcb61b38c, 0xbc66831a, 0x256fd2a0, 0x5268e236,
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260 0xcc0c7795, 0xbb0b4703, 0x220216b9, 0x5505262f, 0xc5ba3bbe,
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261 0xb2bd0b28, 0x2bb45a92, 0x5cb36a04, 0xc2d7ffa7, 0xb5d0cf31,
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262 0x2cd99e8b, 0x5bdeae1d, 0x9b64c2b0, 0xec63f226, 0x756aa39c,
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263 0x026d930a, 0x9c0906a9, 0xeb0e363f, 0x72076785, 0x05005713,
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264 0x95bf4a82, 0xe2b87a14, 0x7bb12bae, 0x0cb61b38, 0x92d28e9b,
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265 0xe5d5be0d, 0x7cdcefb7, 0x0bdbdf21, 0x86d3d2d4, 0xf1d4e242,
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266 0x68ddb3f8, 0x1fda836e, 0x81be16cd, 0xf6b9265b, 0x6fb077e1,
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267 0x18b74777, 0x88085ae6, 0xff0f6a70, 0x66063bca, 0x11010b5c,
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268 0x8f659eff, 0xf862ae69, 0x616bffd3, 0x166ccf45, 0xa00ae278,
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269 0xd70dd2ee, 0x4e048354, 0x3903b3c2, 0xa7672661, 0xd06016f7,
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270 0x4969474d, 0x3e6e77db, 0xaed16a4a, 0xd9d65adc, 0x40df0b66,
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271 0x37d83bf0, 0xa9bcae53, 0xdebb9ec5, 0x47b2cf7f, 0x30b5ffe9,
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272 0xbdbdf21c, 0xcabac28a, 0x53b39330, 0x24b4a3a6, 0xbad03605,
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273 0xcdd70693, 0x54de5729, 0x23d967bf, 0xb3667a2e, 0xc4614ab8,
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274 0x5d681b02, 0x2a6f2b94, 0xb40bbe37, 0xc30c8ea1, 0x5a05df1b,
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275 0x2d02ef8d
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276 };
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277
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278 unsigned char *end;
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279
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280 crc = ~crc & 0xffffffff;
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281 for (end = buf + len; buf < end; ++buf) {
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282 crc = crc32_table[(crc ^ *buf) & 0xff] ^ (crc >> 8);
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283 }
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284 return ~crc & 0xffffffff;
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285 }
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