1cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng/* Locate source files or functions which caused text relocations. 2cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng Copyright (C) 2005, 2006, 2007 Red Hat, Inc. 3cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng This file is part of Red Hat elfutils. 4cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng Written by Ulrich Drepper <drepper@redhat.com>, 2005. 5cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng 6cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng Red Hat elfutils is free software; you can redistribute it and/or modify 7cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng it under the terms of the GNU General Public License as published by the 8cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng Free Software Foundation; version 2 of the License. 9cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng 10cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng Red Hat elfutils is distributed in the hope that it will be useful, but 11cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng WITHOUT ANY WARRANTY; without even the implied warranty of 12cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 13cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng General Public License for more details. 14cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng 15cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng You should have received a copy of the GNU General Public License along 16cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng with Red Hat elfutils; if not, write to the Free Software Foundation, 17cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301 USA. 18cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng 19cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng Red Hat elfutils is an included package of the Open Invention Network. 20cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng An included package of the Open Invention Network is a package for which 21cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng Open Invention Network licensees cross-license their patents. No patent 22cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng license is granted, either expressly or impliedly, by designation as an 23cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng included package. Should you wish to participate in the Open Invention 24cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng Network licensing program, please visit www.openinventionnetwork.com 25cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng <http://www.openinventionnetwork.com>. */ 26cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng 27cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng#ifdef HAVE_CONFIG_H 28cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng# include <config.h> 29cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng#endif 30cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng 31cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng#include <argp.h> 32cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng#include <assert.h> 33cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng#include <errno.h> 34cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng#include <error.h> 35cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng#include <fcntl.h> 36cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng#include <gelf.h> 37cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng#include <libdw.h> 38cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng#include <libintl.h> 39cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng#include <locale.h> 40cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng#include <search.h> 41cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng#include <stdbool.h> 42cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng#include <stdio.h> 43cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng#include <stdlib.h> 44cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng#include <string.h> 45cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng#include <unistd.h> 46cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng 47cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng 48cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Chengstruct segments 49cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng{ 50cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng GElf_Addr from; 51cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng GElf_Addr to; 52cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng}; 53cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng 54cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng 55cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng/* Name and version of program. */ 56cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Chengstatic void print_version (FILE *stream, struct argp_state *state); 57cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Chengvoid (*argp_program_version_hook) (FILE *, struct argp_state *) = print_version; 58cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng 59cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng/* Bug report address. */ 60cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Chengconst char *argp_program_bug_address = PACKAGE_BUGREPORT; 61cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng 62cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng/* Values for the parameters which have no short form. */ 63cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng#define OPT_DEBUGINFO 0x100 64cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng 65cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng/* Definitions of arguments for argp functions. */ 66cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Chengstatic const struct argp_option options[] = 67cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng{ 68cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng { NULL, 0, NULL, 0, N_("Input Selection:"), 0 }, 69cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng { "root", 'r', "PATH", 0, N_("Prepend PATH to all file names"), 0 }, 70cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng { "debuginfo", OPT_DEBUGINFO, "PATH", 0, 71cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng N_("Use PATH as root of debuginfo hierarchy"), 0 }, 72cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng 73cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng { NULL, 0, NULL, 0, N_("Miscellaneous:"), 0 }, 74cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng { NULL, 0, NULL, 0, NULL, 0 } 75cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng}; 76cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng 77cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng/* Short description of program. */ 78cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Chengstatic const char doc[] = N_("\ 79cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben ChengLocate source of text relocations in FILEs (a.out by default)."); 80cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng 81cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng/* Strings for arguments in help texts. */ 82cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Chengstatic const char args_doc[] = N_("[FILE...]"); 83cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng 84cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng/* Prototype for option handler. */ 85cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Chengstatic error_t parse_opt (int key, char *arg, struct argp_state *state); 86cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng 87cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng/* Data structure to communicate with argp functions. */ 88cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Chengstatic struct argp argp = 89cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng{ 90cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng options, parse_opt, args_doc, doc, NULL, NULL, NULL 91cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng}; 92cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng 93cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng 94cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng/* Print symbols in file named FNAME. */ 95cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Chengstatic int process_file (const char *fname, bool more_than_one); 96cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng 97cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng/* Check for text relocations in the given file. The segment 98cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng information is known. */ 99cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Chengstatic void check_rel (size_t nsegments, struct segments segments[nsegments], 100cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng GElf_Addr addr, Elf *elf, Elf_Scn *symscn, Dwarf *dw, 101cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng const char *fname, bool more_than_one, 102cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng void **knownsrcs); 103cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng 104cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng 105cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng 106cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng/* User-provided root directory. */ 107cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Chengstatic const char *rootdir = "/"; 108cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng 109cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng/* Root of debuginfo directory hierarchy. */ 110cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Chengstatic const char *debuginfo_root; 111cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng 112cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng 113cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Chengint 114cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Chengmain (int argc, char *argv[]) 115cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng{ 116cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng int remaining; 117cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng int result = 0; 118cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng 119cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng /* Set locale. */ 120cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng (void) setlocale (LC_ALL, ""); 121cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng 122cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng /* Make sure the message catalog can be found. */ 123cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng (void) bindtextdomain (PACKAGE_TARNAME, LOCALEDIR); 124cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng 125cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng /* Initialize the message catalog. */ 126cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng (void) textdomain (PACKAGE_TARNAME); 127cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng 128cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng /* Parse and process arguments. */ 129cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng (void) argp_parse (&argp, argc, argv, 0, &remaining, NULL); 130cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng 131cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng /* Tell the library which version we are expecting. */ 132cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng elf_version (EV_CURRENT); 133cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng 134cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng /* If the user has not specified the root directory for the 135cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng debuginfo hierarchy, we have to determine it ourselves. */ 136cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng if (debuginfo_root == NULL) 137cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng { 138cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng // XXX The runtime should provide this information. 139cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng#if defined __ia64__ || defined __alpha__ 140cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng debuginfo_root = "/usr/lib/debug"; 141cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng#else 142cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng debuginfo_root = (sizeof (long int) == 4 143cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng ? "/usr/lib/debug" : "/usr/lib64/debug"); 144cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng#endif 145cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng } 146cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng 147cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng if (remaining == argc) 148cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng result = process_file ("a.out", false); 149cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng else 150cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng { 151cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng /* Process all the remaining files. */ 152cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng const bool more_than_one = remaining + 1 < argc; 153cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng 154cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng do 155cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng result |= process_file (argv[remaining], more_than_one); 156cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng while (++remaining < argc); 157cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng } 158cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng 159cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng return result; 160cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng} 161cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng 162cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng 163cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng/* Print the version information. */ 164cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Chengstatic void 165cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Chengprint_version (FILE *stream, struct argp_state *state __attribute__ ((unused))) 166cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng{ 167cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng fprintf (stream, "findtextrel (%s) %s\n", PACKAGE_NAME, PACKAGE_VERSION); 168cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng fprintf (stream, gettext ("\ 169cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben ChengCopyright (C) %s Red Hat, Inc.\n\ 170cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben ChengThis is free software; see the source for copying conditions. There is NO\n\ 171cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Chengwarranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.\n\ 172cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng"), "2008"); 173cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng fprintf (stream, gettext ("Written by %s.\n"), "Ulrich Drepper"); 174cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng} 175cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng 176cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng 177cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng/* Handle program arguments. */ 178cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Chengstatic error_t 179cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Chengparse_opt (int key, char *arg, 180cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng struct argp_state *state __attribute__ ((unused))) 181cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng{ 182cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng switch (key) 183cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng { 184cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng case 'r': 185cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng rootdir = arg; 186cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng break; 187cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng 188cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng case OPT_DEBUGINFO: 189cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng debuginfo_root = arg; 190cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng break; 191cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng 192cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng default: 193cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng return ARGP_ERR_UNKNOWN; 194cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng } 195cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng return 0; 196cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng} 197cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng 198cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng 199cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Chengstatic void 200cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Chengnoop (void *arg __attribute__ ((unused))) 201cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng{ 202cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng} 203cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng 204cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng 205cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Chengstatic int 206cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Chengprocess_file (const char *fname, bool more_than_one) 207cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng{ 208cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng int result = 0; 209cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng void *knownsrcs = NULL; 210cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng 211cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng size_t fname_len = strlen (fname); 212cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng size_t rootdir_len = strlen (rootdir); 213cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng const char *real_fname = fname; 214cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng if (fname[0] == '/' && (rootdir[0] != '/' || rootdir[1] != '\0')) 215cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng { 216cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng /* Prepend the user-provided root directory. */ 217cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng char *new_fname = alloca (rootdir_len + fname_len + 2); 218cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng *((char *) mempcpy (stpcpy (mempcpy (new_fname, rootdir, rootdir_len), 219cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng "/"), 220cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng fname, fname_len)) = '\0'; 221cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng real_fname = new_fname; 222cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng } 223cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng 224cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng int fd = open64 (real_fname, O_RDONLY); 225cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng if (fd == -1) 226cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng { 227cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng error (0, errno, gettext ("cannot open '%s'"), fname); 228cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng return 1; 229cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng } 230cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng 231cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng Elf *elf = elf_begin (fd, ELF_C_READ_MMAP, NULL); 232cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng if (elf == NULL) 233cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng { 234cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng error (0, 0, gettext ("cannot create ELF descriptor for '%s': %s"), 235cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng fname, elf_errmsg (-1)); 236cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng goto err_close; 237cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng } 238cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng 239cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng /* Make sure the file is a DSO. */ 240cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng GElf_Ehdr ehdr_mem; 241cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng GElf_Ehdr *ehdr = gelf_getehdr (elf, &ehdr_mem); 242cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng if (ehdr == NULL) 243cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng { 244cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng error (0, 0, gettext ("cannot get ELF header '%s': %s"), 245cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng fname, elf_errmsg (-1)); 246cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng err_elf_close: 247cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng elf_end (elf); 248cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng err_close: 249cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng close (fd); 250cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng return 1; 251cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng } 252cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng 253cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng if (ehdr->e_type != ET_DYN) 254cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng { 255cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng error (0, 0, gettext ("'%s' is not a DSO or PIE"), fname); 256cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng goto err_elf_close; 257cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng } 258cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng 259cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng /* Determine whether the DSO has text relocations at all and locate 260cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng the symbol table. */ 261cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng Elf_Scn *symscn = NULL; 262cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng Elf_Scn *scn = NULL; 263cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng while ((scn = elf_nextscn (elf, scn)) != NULL) 264cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng { 265cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng /* Handle the section if it is a symbol table. */ 266cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng GElf_Shdr shdr_mem; 267cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng GElf_Shdr *shdr = gelf_getshdr (scn, &shdr_mem); 268cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng 269cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng if (shdr == NULL) 270cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng { 271cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng error (0, 0, 272cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng gettext ("getting get section header of section %zu: %s"), 273cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng elf_ndxscn (scn), elf_errmsg (-1)); 274cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng goto err_elf_close; 275cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng } 276cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng 277cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng if (shdr->sh_type == SHT_DYNAMIC) 278cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng { 279cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng Elf_Data *data = elf_getdata (scn, NULL); 280cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng 281cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng for (size_t cnt = 0; cnt < shdr->sh_size / shdr->sh_entsize; 282cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng ++cnt) 283cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng { 284cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng GElf_Dyn dynmem; 285cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng GElf_Dyn *dyn; 286cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng 287cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng dyn = gelf_getdyn (data, cnt, &dynmem); 288cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng if (dyn == NULL) 289cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng { 290cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng error (0, 0, gettext ("cannot read dynamic section: %s"), 291cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng elf_errmsg (-1)); 292cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng goto err_elf_close; 293cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng } 294cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng 295cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng if (dyn->d_tag == DT_TEXTREL 296cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng || (dyn->d_tag == DT_FLAGS 297cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng && (dyn->d_un.d_val & DF_TEXTREL) != 0)) 298cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng goto have_textrel; 299cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng } 300cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng } 301cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng else if (shdr->sh_type == SHT_SYMTAB) 302cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng symscn = scn; 303cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng } 304cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng 305cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng error (0, 0, gettext ("no text relocations reported in '%s'"), fname); 306cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng return 1; 307cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng 308cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng have_textrel:; 309cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng int fd2 = -1; 310cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng Elf *elf2 = NULL; 311cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng /* Get the address ranges for the loaded segments. */ 312cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng size_t nsegments_max = 10; 313cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng size_t nsegments = 0; 314cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng struct segments *segments 315cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng = (struct segments *) malloc (nsegments_max * sizeof (segments[0])); 316cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng if (segments == NULL) 317cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng error (1, errno, gettext ("while reading ELF file")); 318cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng 319cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng for (int i = 0; i < ehdr->e_phnum; ++i) 320cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng { 321cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng GElf_Phdr phdr_mem; 322cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng GElf_Phdr *phdr = gelf_getphdr (elf, i, &phdr_mem); 323cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng if (phdr == NULL) 324cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng { 325cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng error (0, 0, 326cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng gettext ("cannot get program header index at offset %d: %s"), 327cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng i, elf_errmsg (-1)); 328cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng result = 1; 329cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng goto next; 330cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng } 331cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng 332cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng if (phdr->p_type == PT_LOAD && (phdr->p_flags & PF_W) == 0) 333cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng { 334cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng if (nsegments == nsegments_max) 335cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng { 336cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng nsegments_max *= 2; 337cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng segments 338cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng = (struct segments *) realloc (segments, 339cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng nsegments_max 340cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng * sizeof (segments[0])); 341cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng if (segments == NULL) 342cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng { 343cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng error (0, 0, gettext ("\ 344cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Chengcannot get program header index at offset %d: %s"), 345cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng i, elf_errmsg (-1)); 346cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng result = 1; 347cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng goto next; 348cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng } 349cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng } 350cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng 351cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng segments[nsegments].from = phdr->p_vaddr; 352cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng segments[nsegments].to = phdr->p_vaddr + phdr->p_memsz; 353cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng ++nsegments; 354cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng } 355cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng } 356cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng 357cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng if (nsegments > 0) 358cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng { 359cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng 360cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng Dwarf *dw = dwarf_begin_elf (elf, DWARF_C_READ, NULL); 361cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng /* Look for debuginfo files if the information is not the in 362cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng opened file itself. This makes only sense if the input file 363cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng is specified with an absolute path. */ 364cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng if (dw == NULL && fname[0] == '/') 365cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng { 366cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng size_t debuginfo_rootlen = strlen (debuginfo_root); 367cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng char *difname = (char *) alloca (rootdir_len + debuginfo_rootlen 368cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng + fname_len + 8); 369cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng strcpy (mempcpy (stpcpy (mempcpy (mempcpy (difname, rootdir, 370cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng rootdir_len), 371cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng debuginfo_root, 372cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng debuginfo_rootlen), 373cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng "/"), 374cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng fname, fname_len), 375cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng ".debug"); 376cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng 377cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng fd2 = open64 (difname, O_RDONLY); 378cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng if (fd2 != -1 379cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng && (elf2 = elf_begin (fd2, ELF_C_READ_MMAP, NULL)) != NULL) 380cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng dw = dwarf_begin_elf (elf2, DWARF_C_READ, NULL); 381cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng } 382cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng 383cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng /* Look at all relocations and determine which modify 384cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng write-protected segments. */ 385cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng scn = NULL; 386cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng while ((scn = elf_nextscn (elf, scn)) != NULL) 387cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng { 388cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng /* Handle the section if it is a symbol table. */ 389cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng GElf_Shdr shdr_mem; 390cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng GElf_Shdr *shdr = gelf_getshdr (scn, &shdr_mem); 391cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng 392cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng if (shdr == NULL) 393cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng { 394cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng error (0, 0, 395cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng gettext ("cannot get section header of section %Zu: %s"), 396cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng elf_ndxscn (scn), elf_errmsg (-1)); 397cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng result = 1; 398cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng goto next; 399cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng } 400cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng 401cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng if ((shdr->sh_type == SHT_REL || shdr->sh_type == SHT_RELA) 402cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng && symscn == NULL) 403cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng { 404cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng symscn = elf_getscn (elf, shdr->sh_link); 405cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng if (symscn == NULL) 406cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng { 407cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng error (0, 0, gettext ("\ 408cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Chengcannot get symbol table section %zu in '%s': %s"), 409cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng (size_t) shdr->sh_link, fname, elf_errmsg (-1)); 410cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng result = 1; 411cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng goto next; 412cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng } 413cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng } 414cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng 415cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng if (shdr->sh_type == SHT_REL) 416cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng { 417cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng Elf_Data *data = elf_getdata (scn, NULL); 418cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng 419cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng for (int cnt = 0; 420cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng (size_t) cnt < shdr->sh_size / shdr->sh_entsize; 421cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng ++cnt) 422cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng { 423cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng GElf_Rel rel_mem; 424cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng GElf_Rel *rel = gelf_getrel (data, cnt, &rel_mem); 425cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng if (rel == NULL) 426cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng { 427cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng error (0, 0, gettext ("\ 428cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Chengcannot get relocation at index %d in section %zu in '%s': %s"), 429cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng cnt, elf_ndxscn (scn), fname, elf_errmsg (-1)); 430cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng result = 1; 431cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng goto next; 432cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng } 433cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng 434cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng check_rel (nsegments, segments, rel->r_offset, elf, 435cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng symscn, dw, fname, more_than_one, &knownsrcs); 436cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng } 437cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng } 438cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng else if (shdr->sh_type == SHT_RELA) 439cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng { 440cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng Elf_Data *data = elf_getdata (scn, NULL); 441cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng 442cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng for (int cnt = 0; 443cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng (size_t) cnt < shdr->sh_size / shdr->sh_entsize; 444cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng ++cnt) 445cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng { 446cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng GElf_Rela rela_mem; 447cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng GElf_Rela *rela = gelf_getrela (data, cnt, &rela_mem); 448cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng if (rela == NULL) 449cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng { 450cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng error (0, 0, gettext ("\ 451cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Chengcannot get relocation at index %d in section %zu in '%s': %s"), 452cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng cnt, elf_ndxscn (scn), fname, elf_errmsg (-1)); 453cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng result = 1; 454cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng goto next; 455cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng } 456cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng 457cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng check_rel (nsegments, segments, rela->r_offset, elf, 458cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng symscn, dw, fname, more_than_one, &knownsrcs); 459cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng } 460cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng } 461cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng } 462cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng 463cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng dwarf_end (dw); 464cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng } 465cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng 466cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng next: 467cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng elf_end (elf); 468cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng elf_end (elf2); 469cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng close (fd); 470cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng if (fd2 != -1) 471cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng close (fd2); 472cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng 473cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng tdestroy (knownsrcs, noop); 474cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng 475cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng return result; 476cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng} 477cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng 478cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng 479cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Chengstatic int 480cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Chengptrcompare (const void *p1, const void *p2) 481cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng{ 482cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng if ((uintptr_t) p1 < (uintptr_t) p2) 483cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng return -1; 484cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng if ((uintptr_t) p1 > (uintptr_t) p2) 485cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng return 1; 486cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng return 0; 487cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng} 488cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng 489cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng 490cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Chengstatic void 491cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Chengcheck_rel (size_t nsegments, struct segments segments[nsegments], 492cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng GElf_Addr addr, Elf *elf, Elf_Scn *symscn, Dwarf *dw, 493cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng const char *fname, bool more_than_one, void **knownsrcs) 494cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng{ 495cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng for (size_t cnt = 0; cnt < nsegments; ++cnt) 496cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng if (segments[cnt].from <= addr && segments[cnt].to > addr) 497cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng { 498cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng Dwarf_Die die_mem; 499cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng Dwarf_Die *die; 500cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng Dwarf_Line *line; 501cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng const char *src; 502cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng 503cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng if (more_than_one) 504cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng printf ("%s: ", fname); 505cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng 506cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng if ((die = dwarf_addrdie (dw, addr, &die_mem)) != NULL 507cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng && (line = dwarf_getsrc_die (die, addr)) != NULL 508cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng && (src = dwarf_linesrc (line, NULL, NULL)) != NULL) 509cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng { 510cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng /* There can be more than one relocation against one file. 511cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng Try to avoid multiple messages. And yes, the code uses 512cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng pointer comparison. */ 513cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng if (tfind (src, knownsrcs, ptrcompare) == NULL) 514cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng { 515cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng printf (gettext ("%s not compiled with -fpic/-fPIC\n"), src); 516cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng tsearch (src, knownsrcs, ptrcompare); 517cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng } 518cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng return; 519cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng } 520cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng else 521cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng { 522cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng /* At least look at the symbol table to see which function 523cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng the modified address is in. */ 524cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng Elf_Data *symdata = elf_getdata (symscn, NULL); 525cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng GElf_Shdr shdr_mem; 526cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng GElf_Shdr *shdr = gelf_getshdr (symscn, &shdr_mem); 527cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng if (shdr != NULL) 528cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng { 529cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng GElf_Addr lowaddr = 0; 530cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng int lowidx = -1; 531cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng GElf_Addr highaddr = ~0ul; 532cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng int highidx = -1; 533cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng GElf_Sym sym_mem; 534cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng GElf_Sym *sym; 535cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng 536cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng for (int i = 0; (size_t) i < shdr->sh_size / shdr->sh_entsize; 537cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng ++i) 538cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng { 539cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng sym = gelf_getsym (symdata, i, &sym_mem); 540cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng if (sym == NULL) 541cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng continue; 542cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng 543cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng if (sym->st_value < addr && sym->st_value > lowaddr) 544cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng { 545cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng lowaddr = sym->st_value; 546cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng lowidx = i; 547cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng } 548cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng if (sym->st_value > addr && sym->st_value < highaddr) 549cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng { 550cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng highaddr = sym->st_value; 551cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng highidx = i; 552cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng } 553cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng } 554cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng 555cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng if (lowidx != -1) 556cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng { 557cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng sym = gelf_getsym (symdata, lowidx, &sym_mem); 558cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng assert (sym != NULL); 559cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng 560cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng const char *lowstr = elf_strptr (elf, shdr->sh_link, 561cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng sym->st_name); 562cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng 563cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng if (sym->st_value + sym->st_size > addr) 564cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng { 565cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng /* It is this function. */ 566cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng if (tfind (lowstr, knownsrcs, ptrcompare) == NULL) 567cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng { 568cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng printf (gettext ("\ 569cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Chengthe file containing the function '%s' is not compiled with -fpic/-fPIC\n"), 570cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng lowstr); 571cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng tsearch (lowstr, knownsrcs, ptrcompare); 572cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng } 573cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng } 574cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng else if (highidx == -1) 575cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng printf (gettext ("\ 576cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Chengthe file containing the function '%s' might not be compiled with -fpic/-fPIC\n"), 577cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng lowstr); 578cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng else 579cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng { 580cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng sym = gelf_getsym (symdata, highidx, &sym_mem); 581cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng assert (sym != NULL); 582cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng 583cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng printf (gettext ("\ 584cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Chengeither the file containing the function '%s' or the file containing the function '%s' is not compiled with -fpic/-fPIC\n"), 585cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng lowstr, elf_strptr (elf, shdr->sh_link, 586cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng sym->st_name)); 587cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng } 588cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng return; 589cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng } 590cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng else if (highidx != -1) 591cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng { 592cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng sym = gelf_getsym (symdata, highidx, &sym_mem); 593cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng assert (sym != NULL); 594cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng 595cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng printf (gettext ("\ 596cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Chengthe file containing the function '%s' might not be compiled with -fpic/-fPIC\n"), 597cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng elf_strptr (elf, shdr->sh_link, sym->st_name)); 598cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng return; 599cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng } 600cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng } 601cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng } 602cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng 603cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng printf (gettext ("\ 604cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Chenga relocation modifies memory at offset %llu in a write-protected segment\n"), 605cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng (unsigned long long int) addr); 606cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng break; 607cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng } 608cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng} 609cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng 610cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng 611cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng#include "debugpred.h" 612