/* MemProf -- memory profiler and leak detector * Copyright 1999, 2000, 2001, Red Hat, Inc. * Copyright 2002, Kristian Rietveld * * Sysprof -- Sampling, systemwide CPU profiler * Copyright 2004, 2005, 2008 Soeren Sandmann * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ /* Most interesting code in this file is lifted from bfdutils.c * and process.c from Memprof, */ #include #include "binfile.h" #include #include #include #include #include #include static void bfd_nonfatal (const char *string); static void bfd_fatal (const char *string); /* Binary File */ struct BinFile { char * filename; int n_symbols; Symbol *symbols; Symbol undefined; int ref_count; }; static bfd * open_bfd (const char *file) { bfd *abfd = bfd_openr (file, NULL); if (!abfd) return NULL; if (!bfd_check_format (abfd, bfd_object)) { bfd_close (abfd); return NULL; } return abfd; } static unsigned long calc_crc32 (unsigned long crc, unsigned char *buf, size_t len) { static const unsigned long crc32_table[256] = { 0x00000000, 0x77073096, 0xee0e612c, 0x990951ba, 0x076dc419, 0x706af48f, 0xe963a535, 0x9e6495a3, 0x0edb8832, 0x79dcb8a4, 0xe0d5e91e, 0x97d2d988, 0x09b64c2b, 0x7eb17cbd, 0xe7b82d07, 0x90bf1d91, 0x1db71064, 0x6ab020f2, 0xf3b97148, 0x84be41de, 0x1adad47d, 0x6ddde4eb, 0xf4d4b551, 0x83d385c7, 0x136c9856, 0x646ba8c0, 0xfd62f97a, 0x8a65c9ec, 0x14015c4f, 0x63066cd9, 0xfa0f3d63, 0x8d080df5, 0x3b6e20c8, 0x4c69105e, 0xd56041e4, 0xa2677172, 0x3c03e4d1, 0x4b04d447, 0xd20d85fd, 0xa50ab56b, 0x35b5a8fa, 0x42b2986c, 0xdbbbc9d6, 0xacbcf940, 0x32d86ce3, 0x45df5c75, 0xdcd60dcf, 0xabd13d59, 0x26d930ac, 0x51de003a, 0xc8d75180, 0xbfd06116, 0x21b4f4b5, 0x56b3c423, 0xcfba9599, 0xb8bda50f, 0x2802b89e, 0x5f058808, 0xc60cd9b2, 0xb10be924, 0x2f6f7c87, 0x58684c11, 0xc1611dab, 0xb6662d3d, 0x76dc4190, 0x01db7106, 0x98d220bc, 0xefd5102a, 0x71b18589, 0x06b6b51f, 0x9fbfe4a5, 0xe8b8d433, 0x7807c9a2, 0x0f00f934, 0x9609a88e, 0xe10e9818, 0x7f6a0dbb, 0x086d3d2d, 0x91646c97, 0xe6635c01, 0x6b6b51f4, 0x1c6c6162, 0x856530d8, 0xf262004e, 0x6c0695ed, 0x1b01a57b, 0x8208f4c1, 0xf50fc457, 0x65b0d9c6, 0x12b7e950, 0x8bbeb8ea, 0xfcb9887c, 0x62dd1ddf, 0x15da2d49, 0x8cd37cf3, 0xfbd44c65, 0x4db26158, 0x3ab551ce, 0xa3bc0074, 0xd4bb30e2, 0x4adfa541, 0x3dd895d7, 0xa4d1c46d, 0xd3d6f4fb, 0x4369e96a, 0x346ed9fc, 0xad678846, 0xda60b8d0, 0x44042d73, 0x33031de5, 0xaa0a4c5f, 0xdd0d7cc9, 0x5005713c, 0x270241aa, 0xbe0b1010, 0xc90c2086, 0x5768b525, 0x206f85b3, 0xb966d409, 0xce61e49f, 0x5edef90e, 0x29d9c998, 0xb0d09822, 0xc7d7a8b4, 0x59b33d17, 0x2eb40d81, 0xb7bd5c3b, 0xc0ba6cad, 0xedb88320, 0x9abfb3b6, 0x03b6e20c, 0x74b1d29a, 0xead54739, 0x9dd277af, 0x04db2615, 0x73dc1683, 0xe3630b12, 0x94643b84, 0x0d6d6a3e, 0x7a6a5aa8, 0xe40ecf0b, 0x9309ff9d, 0x0a00ae27, 0x7d079eb1, 0xf00f9344, 0x8708a3d2, 0x1e01f268, 0x6906c2fe, 0xf762575d, 0x806567cb, 0x196c3671, 0x6e6b06e7, 0xfed41b76, 0x89d32be0, 0x10da7a5a, 0x67dd4acc, 0xf9b9df6f, 0x8ebeeff9, 0x17b7be43, 0x60b08ed5, 0xd6d6a3e8, 0xa1d1937e, 0x38d8c2c4, 0x4fdff252, 0xd1bb67f1, 0xa6bc5767, 0x3fb506dd, 0x48b2364b, 0xd80d2bda, 0xaf0a1b4c, 0x36034af6, 0x41047a60, 0xdf60efc3, 0xa867df55, 0x316e8eef, 0x4669be79, 0xcb61b38c, 0xbc66831a, 0x256fd2a0, 0x5268e236, 0xcc0c7795, 0xbb0b4703, 0x220216b9, 0x5505262f, 0xc5ba3bbe, 0xb2bd0b28, 0x2bb45a92, 0x5cb36a04, 0xc2d7ffa7, 0xb5d0cf31, 0x2cd99e8b, 0x5bdeae1d, 0x9b64c2b0, 0xec63f226, 0x756aa39c, 0x026d930a, 0x9c0906a9, 0xeb0e363f, 0x72076785, 0x05005713, 0x95bf4a82, 0xe2b87a14, 0x7bb12bae, 0x0cb61b38, 0x92d28e9b, 0xe5d5be0d, 0x7cdcefb7, 0x0bdbdf21, 0x86d3d2d4, 0xf1d4e242, 0x68ddb3f8, 0x1fda836e, 0x81be16cd, 0xf6b9265b, 0x6fb077e1, 0x18b74777, 0x88085ae6, 0xff0f6a70, 0x66063bca, 0x11010b5c, 0x8f659eff, 0xf862ae69, 0x616bffd3, 0x166ccf45, 0xa00ae278, 0xd70dd2ee, 0x4e048354, 0x3903b3c2, 0xa7672661, 0xd06016f7, 0x4969474d, 0x3e6e77db, 0xaed16a4a, 0xd9d65adc, 0x40df0b66, 0x37d83bf0, 0xa9bcae53, 0xdebb9ec5, 0x47b2cf7f, 0x30b5ffe9, 0xbdbdf21c, 0xcabac28a, 0x53b39330, 0x24b4a3a6, 0xbad03605, 0xcdd70693, 0x54de5729, 0x23d967bf, 0xb3667a2e, 0xc4614ab8, 0x5d681b02, 0x2a6f2b94, 0xb40bbe37, 0xc30c8ea1, 0x5a05df1b, 0x2d02ef8d }; unsigned char *end; crc = ~crc & 0xffffffff; for (end = buf + len; buf < end; ++buf) crc = crc32_table[(crc ^ *buf) & 0xff] ^ (crc >> 8); return ~crc & 0xffffffff;; } static char * get_debug_link_info (bfd *abfd, unsigned long *crc32_out) { asection *sect; ssize_t debuglink_size; unsigned long crc32; char *contents; int crc_offset; sect = bfd_get_section_by_name (abfd, ".gnu_debuglink"); if (sect == NULL) return NULL; debuglink_size = bfd_get_section_limit (abfd, sect); if (debuglink_size < 6) { g_warning ("%s: .gnu_debuglink section is %d bytes long", abfd->filename, debuglink_size); return NULL; } contents = g_malloc (debuglink_size); bfd_get_section_contents (abfd, sect, contents, (file_ptr)0, (bfd_size_type)debuglink_size); /* Sanity check */ if (!memchr (contents, '\0', debuglink_size - 4)) { g_warning ("%s: Malformed .gnu_debuglink section", abfd->filename); g_free (contents); return NULL; } /* Crc value is stored after the filename, aligned up to 4 bytes. */ crc_offset = strlen (contents) + 1; crc_offset = (crc_offset + 3) & ~3; crc32 = bfd_get_32 (abfd, (bfd_byte *) (contents + crc_offset)); *crc32_out = crc32; return contents; } static gboolean separate_debug_file_exists (const char *name, unsigned long crc) { unsigned long file_crc = 0; int fd; guchar buffer[8*1024]; int count; fd = open (name, O_RDONLY); if (fd < 0) return 0; while ((count = read (fd, buffer, sizeof (buffer))) > 0) file_crc = calc_crc32 (file_crc, buffer, count); close (fd); if (crc != file_crc) { g_print ("warning: %s has wrong crc\n", name); return FALSE; } else { return TRUE; } } /* FIXME - not10: this should probably be detected by config.h -- find out what gdb does*/ static const char *debug_file_directory = "/usr/lib/debug"; static char * find_separate_debug_file (bfd *abfd) { char *basename; char *dir; char *debugfile; unsigned long crc32; basename = get_debug_link_info (abfd, &crc32); if (basename == NULL) return NULL; dir = g_path_get_dirname (bfd_get_filename (abfd)); /* First try in the same directory as the original file: */ debugfile = g_build_filename (dir, basename, NULL); if (separate_debug_file_exists (debugfile, crc32)) { g_free (basename); g_free (dir); return debugfile; } g_free (debugfile); /* Then try in a subdirectory called .debug */ debugfile = g_build_filename (dir, ".debug", basename, NULL); if (separate_debug_file_exists (debugfile, crc32)) { g_free (basename); g_free (dir); return debugfile; } g_free (debugfile); /* Then try in the global debugfile directory */ debugfile = g_build_filename (debug_file_directory, dir, basename, NULL); if (separate_debug_file_exists (debugfile, crc32)) { g_free (basename); g_free (dir); return debugfile; } g_free (debugfile); g_free (basename); g_free (dir); return NULL; } static asymbol ** slurp_symtab (bfd *abfd, long *symcount) { asymbol **sy = (asymbol **) NULL; long storage; if (!(bfd_get_file_flags (abfd) & HAS_SYMS)) { *symcount = 0; return NULL; } storage = bfd_get_symtab_upper_bound (abfd); if (storage < 0) bfd_fatal (bfd_get_filename (abfd)); if (storage) sy = (asymbol **) malloc (storage); *symcount = bfd_canonicalize_symtab (abfd, sy); if (*symcount < 0) bfd_fatal (bfd_get_filename (abfd)); return sy; } extern char *cplus_demangle (const char *mangled, int options); #define DMGL_PARAMS (1 << 0) /* Include function args */ #define DMGL_ANSI (1 << 1) /* Include const, volatile, etc */ static char * demangle (bfd *bfd, const char *name) { char *demangled; if (bfd_get_symbol_leading_char (bfd) == *name) ++name; demangled = cplus_demangle (name, DMGL_ANSI | DMGL_PARAMS); return demangled ? demangled : g_strdup (name); } static gint compare_address (const void *a, const void *b) { const Symbol *symbol1 = a; const Symbol *symbol2 = b; if (symbol1->address < symbol2->address) return -1; else if (symbol1->address == symbol2->address) return 0; else return 1; } static void read_symbols (BinFile *bf) { asection *text_section; const char *separate_debug_file; asymbol **bfd_symbols; long n_symbols; int i; bfd *bfd; GArray *symbols; file_ptr real_text_offset; bf->symbols = NULL; bf->n_symbols = 0; bfd = open_bfd (bf->filename); if (!bfd) return; text_section = bfd_get_section_by_name (bfd, ".text"); if (!text_section) { bfd_close (bfd); return; } /* Offset of the text segment in the real binary (not the debug one) */ real_text_offset = text_section->filepos; separate_debug_file = find_separate_debug_file (bfd); if (separate_debug_file) { bfd_close (bfd); bfd = open_bfd (separate_debug_file); #if 0 g_print ("bfd for %s is %s\n", bf->filename, separate_debug_file); #endif if (!bfd) return; } bfd_symbols = slurp_symtab (bfd, &n_symbols); if (!bfd_symbols) return; text_section = bfd_get_section_by_name (bfd, ".text"); if (!text_section) return; symbols = g_array_new (FALSE, FALSE, sizeof (Symbol)); /* g_print ("%s: text vma: %x\n", bf->filename, text_section->vma); */ for (i = 0; i < n_symbols; i++) { Symbol symbol; if ((bfd_symbols[i]->flags & BSF_FUNCTION) && (bfd_symbols[i]->section == text_section)) { /* Store the address in * * "offset into text_segment + filepos of text segment in original binary" * * Ie., "file position of original binary" */ /* offset into text section */ symbol.address = bfd_asymbol_value (bfd_symbols[i]) - text_section->vma + real_text_offset; symbol.name = demangle (bfd, bfd_asymbol_name (bfd_symbols[i])); #if 0 g_print ("computed address for %s: %lx\n", symbol.name, symbol.address); #endif g_array_append_vals (symbols, &symbol, 1); } } if (n_symbols) free (bfd_symbols); #if 0 if (!n_symbols) g_print ("no symbols found for %s\n", bf->filename); else g_print ("symbols found for %s\n", bf->filename); #endif /* Sort the symbols by address */ qsort (symbols->data, symbols->len, sizeof(Symbol), compare_address); bf->n_symbols = symbols->len; bf->symbols = (Symbol *)g_array_free (symbols, FALSE); } static GHashTable *bin_files; BinFile * bin_file_new (const char *filename) { BinFile *bf; if (!bin_files) bin_files = g_hash_table_new (g_str_hash, g_str_equal); bf = g_hash_table_lookup (bin_files, filename); if (bf) { bf->ref_count++; } else { bf = g_new0 (BinFile, 1); bf->filename = g_strdup (filename); read_symbols (bf); bf->undefined.name = g_strdup_printf ("In file %s", filename); bf->undefined.address = 0x0; bf->ref_count = 1; g_hash_table_insert (bin_files, bf->filename, bf); } return bf; } void bin_file_free (BinFile *bf) { if (--bf->ref_count == 0) { int i; g_hash_table_remove (bin_files, bf->filename); g_free (bf->filename); for (i = 0; i < bf->n_symbols; ++i) g_free (bf->symbols[i].name); g_free (bf->symbols); g_free (bf->undefined.name); g_free (bf); } } /** * bin_file_lookup_symbol: * @bf: A BinFile * @address: The address to lookup * * Look up a symbol. @address should be in file coordinates * **/ const Symbol * bin_file_lookup_symbol (BinFile *bf, gulong address) { int first = 0; int last = bf->n_symbols - 1; int middle = last; Symbol *data; Symbol *result; if (!bf->symbols || (bf->n_symbols == 0)) return &(bf->undefined); data = bf->symbols; #if 0 g_print ("looking up %p in %s ", address, bf->filename); #endif if (address < data[last].address) { /* Invariant: data[first].addr <= val < data[last].addr */ while (first < last - 1) { middle = (first + last) / 2; if (address < data[middle].address) last = middle; else first = middle; } /* Size is not included in generic bfd data, so we * ignore it for now. (It is ELF specific) */ result = &data[first]; } else { result = &data[last]; } #if 0 g_print ("-> %s\n", result->name); #endif /* If the name is "call_gmon_start", the file probably doesn't * have any other symbols */ if (strcmp (result->name, "call_gmon_start") == 0) return &(bf->undefined); else if (strncmp (result->name, "__do_global_ctors_aux", strlen ("__do_global_ctors_aux")) == 0) { #if 0 g_print ("ctors: %p, pos: %p\n", address, result->address); #endif } return result; } /* Symbol */ Symbol * symbol_copy (const Symbol *orig) { Symbol *copy; copy = g_new (Symbol, 1); copy->name = g_strdup (orig->name); copy->address = orig->address; return copy; } gboolean symbol_equal (const void *sa, const void *sb) { const Symbol *syma = sa; const Symbol *symb = sb; if (symb->address != syma->address) return FALSE; /* symbols compare equal if their names are both NULL */ if (!syma->name && !symb->name) return TRUE; if (!syma) return FALSE; if (!symb) return FALSE; return strcmp (syma->name, symb->name) == 0; } guint symbol_hash (const void *s) { const Symbol *symbol = s; if (!s) return 0; return symbol->name? g_str_hash (symbol->name) : 0 + symbol->address; } void symbol_free (Symbol *symbol) { if (symbol->name) g_free (symbol->name); g_free (symbol); } static void bfd_nonfatal (const char *string) { const char *errmsg = bfd_errmsg (bfd_get_error ()); if (string) { fprintf (stderr, "%s: %s: %s\n", g_get_application_name(), string, errmsg); } else { fprintf (stderr, "%s: %s\n", g_get_application_name(), errmsg); } } static void bfd_fatal (const char *string) { bfd_nonfatal (string); exit (1); }