/* objdump.c -- dump information about an object file. Copyright (C) 1990-2019 Free Software Foundation, Inc. This file is part of GNU Binutils. 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 3, 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, 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, USA. */ /* Objdump overview. Objdump displays information about one or more object files, either on their own, or inside libraries. It is commonly used as a disassembler, but it can also display information about file headers, symbol tables, relocations, debugging directives and more. The flow of execution is as follows: 1. Command line arguments are checked for control switches and the information to be displayed is selected. 2. Any remaining arguments are assumed to be object files, and they are processed in order by display_bfd(). If the file is an archive each of its elements is processed in turn. 3. The file's target architecture and binary file format are determined by bfd_check_format(). If they are recognised, then dump_bfd() is called. 4. dump_bfd() in turn calls separate functions to display the requested item(s) of information(s). For example disassemble_data() is called if a disassembly has been requested. When disassembling the code loops through blocks of instructions bounded by symbols, calling disassemble_bytes() on each block. The actual disassembling is done by the libopcodes library, via a function pointer supplied by the disassembler() function. */ #include "sysdep.h" #include "bfd.h" #include "elf-bfd.h" #include "coff-bfd.h" #include "progress.h" #include "bucomm.h" #include "elfcomm.h" #include "dwarf.h" #include "ctf-api.h" #include "getopt.h" #include "safe-ctype.h" #include "dis-asm.h" #include "libiberty.h" #include "demangle.h" #include "filenames.h" #include "debug.h" #include "budbg.h" #include "objdump.h" #ifdef HAVE_MMAP #include #endif /* Internal headers for the ELF .stab-dump code - sorry. */ #define BYTES_IN_WORD 32 #include "aout/aout64.h" /* Exit status. */ static int exit_status = 0; static char *default_target = NULL; /* Default at runtime. */ /* The following variables are set based on arguments passed on the command line. */ static int show_version = 0; /* Show the version number. */ static int dump_section_contents; /* -s */ static int dump_section_headers; /* -h */ static bfd_boolean dump_file_header; /* -f */ static int dump_symtab; /* -t */ static int dump_dynamic_symtab; /* -T */ static int dump_reloc_info; /* -r */ static int dump_dynamic_reloc_info; /* -R */ static int dump_ar_hdrs; /* -a */ static int dump_private_headers; /* -p */ static char *dump_private_options; /* -P */ static int prefix_addresses; /* --prefix-addresses */ static int with_line_numbers; /* -l */ static bfd_boolean with_source_code; /* -S */ static int show_raw_insn; /* --show-raw-insn */ static int dump_dwarf_section_info; /* --dwarf */ static int dump_stab_section_info; /* --stabs */ static int dump_ctf_section_info; /* --ctf */ static char *dump_ctf_section_name; static char *dump_ctf_parent_name; /* --ctf-parent */ static int do_demangle; /* -C, --demangle */ static bfd_boolean disassemble; /* -d */ static bfd_boolean disassemble_all; /* -D */ static int disassemble_zeroes; /* --disassemble-zeroes */ static bfd_boolean formats_info; /* -i */ static int wide_output; /* -w */ static int insn_width; /* --insn-width */ static bfd_vma start_address = (bfd_vma) -1; /* --start-address */ static bfd_vma stop_address = (bfd_vma) -1; /* --stop-address */ static int dump_debugging; /* --debugging */ static int dump_debugging_tags; /* --debugging-tags */ static int suppress_bfd_header; static int dump_special_syms = 0; /* --special-syms */ static bfd_vma adjust_section_vma = 0; /* --adjust-vma */ static int file_start_context = 0; /* --file-start-context */ static bfd_boolean display_file_offsets;/* -F */ static const char *prefix; /* --prefix */ static int prefix_strip; /* --prefix-strip */ static size_t prefix_length; static bfd_boolean unwind_inlines; /* --inlines. */ static const char * disasm_sym; /* Disassembly start symbol. */ static const char * source_comment; /* --source_comment. */ static int demangle_flags = DMGL_ANSI | DMGL_PARAMS; /* A structure to record the sections mentioned in -j switches. */ struct only { const char * name; /* The name of the section. */ bfd_boolean seen; /* A flag to indicate that the section has been found in one or more input files. */ struct only * next; /* Pointer to the next structure in the list. */ }; /* Pointer to an array of 'only' structures. This pointer is NULL if the -j switch has not been used. */ static struct only * only_list = NULL; /* Variables for handling include file path table. */ static const char **include_paths; static int include_path_count; /* Extra info to pass to the section disassembler and address printing function. */ struct objdump_disasm_info { bfd * abfd; bfd_boolean require_sec; arelent ** dynrelbuf; long dynrelcount; disassembler_ftype disassemble_fn; arelent * reloc; const char * symbol; }; /* Architecture to disassemble for, or default if NULL. */ static char *machine = NULL; /* Target specific options to the disassembler. */ static char *disassembler_options = NULL; /* Endianness to disassemble for, or default if BFD_ENDIAN_UNKNOWN. */ static enum bfd_endian endian = BFD_ENDIAN_UNKNOWN; /* The symbol table. */ static asymbol **syms; /* Number of symbols in `syms'. */ static long symcount = 0; /* The sorted symbol table. */ static asymbol **sorted_syms; /* Number of symbols in `sorted_syms'. */ static long sorted_symcount = 0; /* The dynamic symbol table. */ static asymbol **dynsyms; /* The synthetic symbol table. */ static asymbol *synthsyms; static long synthcount = 0; /* Number of symbols in `dynsyms'. */ static long dynsymcount = 0; static bfd_byte *stabs; static bfd_size_type stab_size; static bfd_byte *strtab; static bfd_size_type stabstr_size; /* Handlers for -P/--private. */ static const struct objdump_private_desc * const objdump_private_vectors[] = { OBJDUMP_PRIVATE_VECTORS NULL }; static void usage (FILE *, int) ATTRIBUTE_NORETURN; static void usage (FILE *stream, int status) { fprintf (stream, _("Usage: %s \n"), program_name); fprintf (stream, _(" Display information from object .\n")); fprintf (stream, _(" At least one of the following switches must be given:\n")); fprintf (stream, _("\ -a, --archive-headers Display archive header information\n\ -f, --file-headers Display the contents of the overall file header\n\ -p, --private-headers Display object format specific file header contents\n\ -P, --private=OPT,OPT... Display object format specific contents\n\ -h, --[section-]headers Display the contents of the section headers\n\ -x, --all-headers Display the contents of all headers\n\ -d, --disassemble Display assembler contents of executable sections\n\ -D, --disassemble-all Display assembler contents of all sections\n\ --disassemble= Display assembler contents from \n\ -S, --source Intermix source code with disassembly\n\ --source-comment[=] Prefix lines of source code with \n\ -s, --full-contents Display the full contents of all sections requested\n\ -g, --debugging Display debug information in object file\n\ -e, --debugging-tags Display debug information using ctags style\n\ -G, --stabs Display (in raw form) any STABS info in the file\n\ -W[lLiaprmfFsoRtUuTgAckK] or\n\ --dwarf[=rawline,=decodedline,=info,=abbrev,=pubnames,=aranges,=macro,=frames,\n\ =frames-interp,=str,=loc,=Ranges,=pubtypes,\n\ =gdb_index,=trace_info,=trace_abbrev,=trace_aranges,\n\ =addr,=cu_index,=links,=follow-links]\n\ Display DWARF info in the file\n\ --ctf=SECTION Display CTF info from SECTION\n\ -t, --syms Display the contents of the symbol table(s)\n\ -T, --dynamic-syms Display the contents of the dynamic symbol table\n\ -r, --reloc Display the relocation entries in the file\n\ -R, --dynamic-reloc Display the dynamic relocation entries in the file\n\ @ Read options from \n\ -v, --version Display this program's version number\n\ -i, --info List object formats and architectures supported\n\ -H, --help Display this information\n\ ")); if (status != 2) { const struct objdump_private_desc * const *desc; fprintf (stream, _("\n The following switches are optional:\n")); fprintf (stream, _("\ -b, --target=BFDNAME Specify the target object format as BFDNAME\n\ -m, --architecture=MACHINE Specify the target architecture as MACHINE\n\ -j, --section=NAME Only display information for section NAME\n\ -M, --disassembler-options=OPT Pass text OPT on to the disassembler\n\ -EB --endian=big Assume big endian format when disassembling\n\ -EL --endian=little Assume little endian format when disassembling\n\ --file-start-context Include context from start of file (with -S)\n\ -I, --include=DIR Add DIR to search list for source files\n\ -l, --line-numbers Include line numbers and filenames in output\n\ -F, --file-offsets Include file offsets when displaying information\n\ -C, --demangle[=STYLE] Decode mangled/processed symbol names\n\ The STYLE, if specified, can be `auto', `gnu',\n\ `lucid', `arm', `hp', `edg', `gnu-v3', `java'\n\ or `gnat'\n\ --recurse-limit Enable a limit on recursion whilst demangling. [Default]\n\ --no-recurse-limit Disable a limit on recursion whilst demangling\n\ -w, --wide Format output for more than 80 columns\n\ -z, --disassemble-zeroes Do not skip blocks of zeroes when disassembling\n\ --start-address=ADDR Only process data whose address is >= ADDR\n\ --stop-address=ADDR Only process data whose address is < ADDR\n\ --prefix-addresses Print complete address alongside disassembly\n\ --[no-]show-raw-insn Display hex alongside symbolic disassembly\n\ --insn-width=WIDTH Display WIDTH bytes on a single line for -d\n\ --adjust-vma=OFFSET Add OFFSET to all displayed section addresses\n\ --special-syms Include special symbols in symbol dumps\n\ --inlines Print all inlines for source line (with -l)\n\ --prefix=PREFIX Add PREFIX to absolute paths for -S\n\ --prefix-strip=LEVEL Strip initial directory names for -S\n")); fprintf (stream, _("\ --dwarf-depth=N Do not display DIEs at depth N or greater\n\ --dwarf-start=N Display DIEs starting with N, at the same depth\n\ or deeper\n\ --dwarf-check Make additional dwarf internal consistency checks.\ \n\ --ctf-parent=SECTION Use SECTION as the CTF parent\n\n")); list_supported_targets (program_name, stream); list_supported_architectures (program_name, stream); disassembler_usage (stream); if (objdump_private_vectors[0] != NULL) { fprintf (stream, _("\nOptions supported for -P/--private switch:\n")); for (desc = objdump_private_vectors; *desc != NULL; desc++) (*desc)->help (stream); } } if (REPORT_BUGS_TO[0] && status == 0) fprintf (stream, _("Report bugs to %s.\n"), REPORT_BUGS_TO); exit (status); } /* 150 isn't special; it's just an arbitrary non-ASCII char value. */ enum option_values { OPTION_ENDIAN=150, OPTION_START_ADDRESS, OPTION_STOP_ADDRESS, OPTION_DWARF, OPTION_PREFIX, OPTION_PREFIX_STRIP, OPTION_INSN_WIDTH, OPTION_ADJUST_VMA, OPTION_DWARF_DEPTH, OPTION_DWARF_CHECK, OPTION_DWARF_START, OPTION_RECURSE_LIMIT, OPTION_NO_RECURSE_LIMIT, OPTION_INLINES, OPTION_SOURCE_COMMENT, OPTION_CTF, OPTION_CTF_PARENT }; static struct option long_options[]= { {"adjust-vma", required_argument, NULL, OPTION_ADJUST_VMA}, {"all-headers", no_argument, NULL, 'x'}, {"private-headers", no_argument, NULL, 'p'}, {"private", required_argument, NULL, 'P'}, {"architecture", required_argument, NULL, 'm'}, {"archive-headers", no_argument, NULL, 'a'}, {"debugging", no_argument, NULL, 'g'}, {"debugging-tags", no_argument, NULL, 'e'}, {"demangle", optional_argument, NULL, 'C'}, {"disassemble", optional_argument, NULL, 'd'}, {"disassemble-all", no_argument, NULL, 'D'}, {"disassembler-options", required_argument, NULL, 'M'}, {"disassemble-zeroes", no_argument, NULL, 'z'}, {"dynamic-reloc", no_argument, NULL, 'R'}, {"dynamic-syms", no_argument, NULL, 'T'}, {"endian", required_argument, NULL, OPTION_ENDIAN}, {"file-headers", no_argument, NULL, 'f'}, {"file-offsets", no_argument, NULL, 'F'}, {"file-start-context", no_argument, &file_start_context, 1}, {"full-contents", no_argument, NULL, 's'}, {"headers", no_argument, NULL, 'h'}, {"help", no_argument, NULL, 'H'}, {"info", no_argument, NULL, 'i'}, {"line-numbers", no_argument, NULL, 'l'}, {"no-show-raw-insn", no_argument, &show_raw_insn, -1}, {"prefix-addresses", no_argument, &prefix_addresses, 1}, {"recurse-limit", no_argument, NULL, OPTION_RECURSE_LIMIT}, {"recursion-limit", no_argument, NULL, OPTION_RECURSE_LIMIT}, {"no-recurse-limit", no_argument, NULL, OPTION_NO_RECURSE_LIMIT}, {"no-recursion-limit", no_argument, NULL, OPTION_NO_RECURSE_LIMIT}, {"reloc", no_argument, NULL, 'r'}, {"section", required_argument, NULL, 'j'}, {"section-headers", no_argument, NULL, 'h'}, {"show-raw-insn", no_argument, &show_raw_insn, 1}, {"source", no_argument, NULL, 'S'}, {"source-comment", optional_argument, NULL, OPTION_SOURCE_COMMENT}, {"special-syms", no_argument, &dump_special_syms, 1}, {"include", required_argument, NULL, 'I'}, {"dwarf", optional_argument, NULL, OPTION_DWARF}, {"ctf", required_argument, NULL, OPTION_CTF}, {"ctf-parent", required_argument, NULL, OPTION_CTF_PARENT}, {"stabs", no_argument, NULL, 'G'}, {"start-address", required_argument, NULL, OPTION_START_ADDRESS}, {"stop-address", required_argument, NULL, OPTION_STOP_ADDRESS}, {"syms", no_argument, NULL, 't'}, {"target", required_argument, NULL, 'b'}, {"version", no_argument, NULL, 'V'}, {"wide", no_argument, NULL, 'w'}, {"prefix", required_argument, NULL, OPTION_PREFIX}, {"prefix-strip", required_argument, NULL, OPTION_PREFIX_STRIP}, {"insn-width", required_argument, NULL, OPTION_INSN_WIDTH}, {"dwarf-depth", required_argument, 0, OPTION_DWARF_DEPTH}, {"dwarf-start", required_argument, 0, OPTION_DWARF_START}, {"dwarf-check", no_argument, 0, OPTION_DWARF_CHECK}, {"inlines", no_argument, 0, OPTION_INLINES}, {0, no_argument, 0, 0} }; static void nonfatal (const char *msg) { bfd_nonfatal (msg); exit_status = 1; } /* Returns a version of IN with any control characters replaced by escape sequences. Uses a static buffer if necessary. */ static const char * sanitize_string (const char * in) { static char * buffer = NULL; static size_t buffer_len = 0; const char * original = in; char * out; /* Paranoia. */ if (in == NULL) return ""; /* See if any conversion is necessary. In the majority of cases it will not be needed. */ do { char c = *in++; if (c == 0) return original; if (ISCNTRL (c)) break; } while (1); /* Copy the input, translating as needed. */ in = original; if (buffer_len < (strlen (in) * 2)) { free ((void *) buffer); buffer_len = strlen (in) * 2; buffer = xmalloc (buffer_len + 1); } out = buffer; do { char c = *in++; if (c == 0) break; if (!ISCNTRL (c)) *out++ = c; else { *out++ = '^'; *out++ = c + 0x40; } } while (1); *out = 0; return buffer; } /* Returns TRUE if the specified section should be dumped. */ static bfd_boolean process_section_p (asection * section) { struct only * only; if (only_list == NULL) return TRUE; for (only = only_list; only; only = only->next) if (strcmp (only->name, section->name) == 0) { only->seen = TRUE; return TRUE; } return FALSE; } /* Add an entry to the 'only' list. */ static void add_only (char * name) { struct only * only; /* First check to make sure that we do not already have an entry for this name. */ for (only = only_list; only; only = only->next) if (strcmp (only->name, name) == 0) return; only = xmalloc (sizeof * only); only->name = name; only->seen = FALSE; only->next = only_list; only_list = only; } /* Release the memory used by the 'only' list. PR 11225: Issue a warning message for unseen sections. Only do this if none of the sections were seen. This is mainly to support tools like the GAS testsuite where an object file is dumped with a list of generic section names known to be present in a range of different file formats. */ static void free_only_list (void) { bfd_boolean at_least_one_seen = FALSE; struct only * only; struct only * next; if (only_list == NULL) return; for (only = only_list; only; only = only->next) if (only->seen) { at_least_one_seen = TRUE; break; } for (only = only_list; only; only = next) { if (! at_least_one_seen) { non_fatal (_("section '%s' mentioned in a -j option, " "but not found in any input file"), only->name); exit_status = 1; } next = only->next; free (only); } } static void dump_section_header (bfd *abfd, asection *section, void *data) { char *comma = ""; unsigned int opb = bfd_octets_per_byte (abfd, section); int longest_section_name = *((int *) data); /* Ignore linker created section. See elfNN_ia64_object_p in bfd/elfxx-ia64.c. */ if (section->flags & SEC_LINKER_CREATED) return; /* PR 10413: Skip sections that we are ignoring. */ if (! process_section_p (section)) return; printf ("%3d %-*s %08lx ", section->index, longest_section_name, sanitize_string (bfd_section_name (section)), (unsigned long) bfd_section_size (section) / opb); bfd_printf_vma (abfd, bfd_section_vma (section)); printf (" "); bfd_printf_vma (abfd, section->lma); printf (" %08lx 2**%u", (unsigned long) section->filepos, bfd_section_alignment (section)); if (! wide_output) printf ("\n "); printf (" "); #define PF(x, y) \ if (section->flags & x) { printf ("%s%s", comma, y); comma = ", "; } PF (SEC_HAS_CONTENTS, "CONTENTS"); PF (SEC_ALLOC, "ALLOC"); PF (SEC_CONSTRUCTOR, "CONSTRUCTOR"); PF (SEC_LOAD, "LOAD"); PF (SEC_RELOC, "RELOC"); PF (SEC_READONLY, "READONLY"); PF (SEC_CODE, "CODE"); PF (SEC_DATA, "DATA"); PF (SEC_ROM, "ROM"); PF (SEC_DEBUGGING, "DEBUGGING"); PF (SEC_NEVER_LOAD, "NEVER_LOAD"); PF (SEC_EXCLUDE, "EXCLUDE"); PF (SEC_SORT_ENTRIES, "SORT_ENTRIES"); if (bfd_get_arch (abfd) == bfd_arch_tic54x) { PF (SEC_TIC54X_BLOCK, "BLOCK"); PF (SEC_TIC54X_CLINK, "CLINK"); } PF (SEC_SMALL_DATA, "SMALL_DATA"); if (bfd_get_flavour (abfd) == bfd_target_coff_flavour) { PF (SEC_COFF_SHARED, "SHARED"); PF (SEC_COFF_NOREAD, "NOREAD"); } else if (bfd_get_flavour (abfd) == bfd_target_elf_flavour) { PF (SEC_ELF_OCTETS, "OCTETS"); PF (SEC_ELF_PURECODE, "PURECODE"); } PF (SEC_THREAD_LOCAL, "THREAD_LOCAL"); PF (SEC_GROUP, "GROUP"); if (bfd_get_arch (abfd) == bfd_arch_mep) { PF (SEC_MEP_VLIW, "VLIW"); } if ((section->flags & SEC_LINK_ONCE) != 0) { const char *ls; struct coff_comdat_info *comdat; switch (section->flags & SEC_LINK_DUPLICATES) { default: abort (); case SEC_LINK_DUPLICATES_DISCARD: ls = "LINK_ONCE_DISCARD"; break; case SEC_LINK_DUPLICATES_ONE_ONLY: ls = "LINK_ONCE_ONE_ONLY"; break; case SEC_LINK_DUPLICATES_SAME_SIZE: ls = "LINK_ONCE_SAME_SIZE"; break; case SEC_LINK_DUPLICATES_SAME_CONTENTS: ls = "LINK_ONCE_SAME_CONTENTS"; break; } printf ("%s%s", comma, ls); comdat = bfd_coff_get_comdat_section (abfd, section); if (comdat != NULL) printf (" (COMDAT %s %ld)", comdat->name, comdat->symbol); comma = ", "; } printf ("\n"); #undef PF } /* Called on each SECTION in ABFD, update the int variable pointed to by DATA which contains the string length of the longest section name. */ static void find_longest_section_name (bfd *abfd ATTRIBUTE_UNUSED, asection *section, void *data) { int *longest_so_far = (int *) data; const char *name; int len; /* Ignore linker created section. */ if (section->flags & SEC_LINKER_CREATED) return; /* Skip sections that we are ignoring. */ if (! process_section_p (section)) return; name = bfd_section_name (section); len = (int) strlen (name); if (len > *longest_so_far) *longest_so_far = len; } static void dump_headers (bfd *abfd) { /* The default width of 13 is just an arbitrary choice. */ int max_section_name_length = 13; int bfd_vma_width; #ifndef BFD64 bfd_vma_width = 10; #else /* With BFD64, non-ELF returns -1 and wants always 64 bit addresses. */ if (bfd_get_arch_size (abfd) == 32) bfd_vma_width = 10; else bfd_vma_width = 18; #endif printf (_("Sections:\n")); if (wide_output) bfd_map_over_sections (abfd, find_longest_section_name, &max_section_name_length); printf (_("Idx %-*s Size %-*s%-*sFile off Algn"), max_section_name_length, "Name", bfd_vma_width, "VMA", bfd_vma_width, "LMA"); if (wide_output) printf (_(" Flags")); printf ("\n"); bfd_map_over_sections (abfd, dump_section_header, &max_section_name_length); } static asymbol ** slurp_symtab (bfd *abfd) { asymbol **sy = 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) { non_fatal (_("failed to read symbol table from: %s"), bfd_get_filename (abfd)); bfd_fatal (_("error message was")); } if (storage) { off_t filesize = bfd_get_file_size (abfd); /* qv PR 24707. */ if (filesize > 0 && filesize < storage /* The MMO file format supports its own special compression technique, so its sections can be larger than the file size. */ && bfd_get_flavour (abfd) != bfd_target_mmo_flavour) { bfd_nonfatal_message (bfd_get_filename (abfd), abfd, NULL, _("error: symbol table size (%#lx) is larger than filesize (%#lx)"), storage, (long) filesize); exit_status = 1; symcount = 0; return NULL; } sy = (asymbol **) xmalloc (storage); } symcount = bfd_canonicalize_symtab (abfd, sy); if (symcount < 0) bfd_fatal (bfd_get_filename (abfd)); return sy; } /* Read in the dynamic symbols. */ static asymbol ** slurp_dynamic_symtab (bfd *abfd) { asymbol **sy = NULL; long storage; storage = bfd_get_dynamic_symtab_upper_bound (abfd); if (storage < 0) { if (!(bfd_get_file_flags (abfd) & DYNAMIC)) { non_fatal (_("%s: not a dynamic object"), bfd_get_filename (abfd)); exit_status = 1; dynsymcount = 0; return NULL; } bfd_fatal (bfd_get_filename (abfd)); } if (storage) sy = (asymbol **) xmalloc (storage); dynsymcount = bfd_canonicalize_dynamic_symtab (abfd, sy); if (dynsymcount < 0) bfd_fatal (bfd_get_filename (abfd)); return sy; } /* Some symbol names are significant and should be kept in the table of sorted symbol names, even if they are marked as debugging/section symbols. */ static bfd_boolean is_significant_symbol_name (const char * name) { return strncmp (name, ".plt", 4) == 0 || strcmp (name, ".got") == 0; } /* Filter out (in place) symbols that are useless for disassembly. COUNT is the number of elements in SYMBOLS. Return the number of useful symbols. */ static long remove_useless_symbols (asymbol **symbols, long count) { asymbol **in_ptr = symbols, **out_ptr = symbols; while (--count >= 0) { asymbol *sym = *in_ptr++; if (sym->name == NULL || sym->name[0] == '\0') continue; if ((sym->flags & (BSF_DEBUGGING | BSF_SECTION_SYM)) && ! is_significant_symbol_name (sym->name)) continue; if (bfd_is_und_section (sym->section) || bfd_is_com_section (sym->section)) continue; *out_ptr++ = sym; } return out_ptr - symbols; } static const asection *compare_section; /* Sort symbols into value order. */ static int compare_symbols (const void *ap, const void *bp) { const asymbol *a = * (const asymbol **) ap; const asymbol *b = * (const asymbol **) bp; const char *an; const char *bn; size_t anl; size_t bnl; bfd_boolean as, af, bs, bf; flagword aflags; flagword bflags; if (bfd_asymbol_value (a) > bfd_asymbol_value (b)) return 1; else if (bfd_asymbol_value (a) < bfd_asymbol_value (b)) return -1; /* Prefer symbols from the section currently being disassembled. Don't sort symbols from other sections by section, since there isn't much reason to prefer one section over another otherwise. See sym_ok comment for why we compare by section name. */ as = strcmp (compare_section->name, a->section->name) == 0; bs = strcmp (compare_section->name, b->section->name) == 0; if (as && !bs) return -1; if (!as && bs) return 1; an = bfd_asymbol_name (a); bn = bfd_asymbol_name (b); anl = strlen (an); bnl = strlen (bn); /* The symbols gnu_compiled and gcc2_compiled convey no real information, so put them after other symbols with the same value. */ af = (strstr (an, "gnu_compiled") != NULL || strstr (an, "gcc2_compiled") != NULL); bf = (strstr (bn, "gnu_compiled") != NULL || strstr (bn, "gcc2_compiled") != NULL); if (af && ! bf) return 1; if (! af && bf) return -1; /* We use a heuristic for the file name, to try to sort it after more useful symbols. It may not work on non Unix systems, but it doesn't really matter; the only difference is precisely which symbol names get printed. */ #define file_symbol(s, sn, snl) \ (((s)->flags & BSF_FILE) != 0 \ || ((snl) > 2 \ && (sn)[(snl) - 2] == '.' \ && ((sn)[(snl) - 1] == 'o' \ || (sn)[(snl) - 1] == 'a'))) af = file_symbol (a, an, anl); bf = file_symbol (b, bn, bnl); if (af && ! bf) return 1; if (! af && bf) return -1; /* Sort function and object symbols before global symbols before local symbols before section symbols before debugging symbols. */ aflags = a->flags; bflags = b->flags; if ((aflags & BSF_DEBUGGING) != (bflags & BSF_DEBUGGING)) { if ((aflags & BSF_DEBUGGING) != 0) return 1; else return -1; } if ((aflags & BSF_SECTION_SYM) != (bflags & BSF_SECTION_SYM)) { if ((aflags & BSF_SECTION_SYM) != 0) return 1; else return -1; } if ((aflags & BSF_FUNCTION) != (bflags & BSF_FUNCTION)) { if ((aflags & BSF_FUNCTION) != 0) return -1; else return 1; } if ((aflags & BSF_OBJECT) != (bflags & BSF_OBJECT)) { if ((aflags & BSF_OBJECT) != 0) return -1; else return 1; } if ((aflags & BSF_LOCAL) != (bflags & BSF_LOCAL)) { if ((aflags & BSF_LOCAL) != 0) return 1; else return -1; } if ((aflags & BSF_GLOBAL) != (bflags & BSF_GLOBAL)) { if ((aflags & BSF_GLOBAL) != 0) return -1; else return 1; } if (bfd_get_flavour (bfd_asymbol_bfd (a)) == bfd_target_elf_flavour && bfd_get_flavour (bfd_asymbol_bfd (b)) == bfd_target_elf_flavour) { bfd_vma asz, bsz; asz = 0; if ((a->flags & (BSF_SECTION_SYM | BSF_SYNTHETIC)) == 0) asz = ((elf_symbol_type *) a)->internal_elf_sym.st_size; bsz = 0; if ((b->flags & (BSF_SECTION_SYM | BSF_SYNTHETIC)) == 0) bsz = ((elf_symbol_type *) b)->internal_elf_sym.st_size; if (asz != bsz) return asz > bsz ? -1 : 1; } /* Symbols that start with '.' might be section names, so sort them after symbols that don't start with '.'. */ if (an[0] == '.' && bn[0] != '.') return 1; if (an[0] != '.' && bn[0] == '.') return -1; /* Finally, if we can't distinguish them in any other way, try to get consistent results by sorting the symbols by name. */ return strcmp (an, bn); } /* Sort relocs into address order. */ static int compare_relocs (const void *ap, const void *bp) { const arelent *a = * (const arelent **) ap; const arelent *b = * (const arelent **) bp; if (a->address > b->address) return 1; else if (a->address < b->address) return -1; /* So that associated relocations tied to the same address show up in the correct order, we don't do any further sorting. */ if (a > b) return 1; else if (a < b) return -1; else return 0; } /* Print an address (VMA) to the output stream in INFO. If SKIP_ZEROES is TRUE, omit leading zeroes. */ static void objdump_print_value (bfd_vma vma, struct disassemble_info *inf, bfd_boolean skip_zeroes) { char buf[30]; char *p; struct objdump_disasm_info *aux; aux = (struct objdump_disasm_info *) inf->application_data; bfd_sprintf_vma (aux->abfd, buf, vma); if (! skip_zeroes) p = buf; else { for (p = buf; *p == '0'; ++p) ; if (*p == '\0') --p; } (*inf->fprintf_func) (inf->stream, "%s", p); } /* Print the name of a symbol. */ static void objdump_print_symname (bfd *abfd, struct disassemble_info *inf, asymbol *sym) { char *alloc; const char *name, *version_string = NULL; bfd_boolean hidden = FALSE; alloc = NULL; name = bfd_asymbol_name (sym); if (do_demangle && name[0] != '\0') { /* Demangle the name. */ alloc = bfd_demangle (abfd, name, demangle_flags); if (alloc != NULL) name = alloc; } if ((sym->flags & (BSF_SECTION_SYM | BSF_SYNTHETIC)) == 0) version_string = bfd_get_symbol_version_string (abfd, sym, &hidden); if (bfd_is_und_section (bfd_asymbol_section (sym))) hidden = TRUE; name = sanitize_string (name); if (inf != NULL) { (*inf->fprintf_func) (inf->stream, "%s", name); if (version_string && *version_string != '\0') (*inf->fprintf_func) (inf->stream, hidden ? "@%s" : "@@%s", version_string); } else { printf ("%s", name); if (version_string && *version_string != '\0') printf (hidden ? "@%s" : "@@%s", version_string); } if (alloc != NULL) free (alloc); } static inline bfd_boolean sym_ok (bfd_boolean want_section, bfd * abfd ATTRIBUTE_UNUSED, long place, asection * sec, struct disassemble_info * inf) { if (want_section) { /* Note - we cannot just compare section pointers because they could be different, but the same... Ie the symbol that we are trying to find could have come from a separate debug info file. Under such circumstances the symbol will be associated with a section in the debug info file, whilst the section we want is in a normal file. So the section pointers will be different, but the section names will be the same. */ if (strcmp (bfd_section_name (sorted_syms[place]->section), bfd_section_name (sec)) != 0) return FALSE; } return inf->symbol_is_valid (sorted_syms[place], inf); } /* Locate a symbol given a bfd and a section (from INFO->application_data), and a VMA. If INFO->application_data->require_sec is TRUE, then always require the symbol to be in the section. Returns NULL if there is no suitable symbol. If PLACE is not NULL, then *PLACE is set to the index of the symbol in sorted_syms. */ static asymbol * find_symbol_for_address (bfd_vma vma, struct disassemble_info *inf, long *place) { /* @@ Would it speed things up to cache the last two symbols returned, and maybe their address ranges? For many processors, only one memory operand can be present at a time, so the 2-entry cache wouldn't be constantly churned by code doing heavy memory accesses. */ /* Indices in `sorted_syms'. */ long min = 0; long max_count = sorted_symcount; long thisplace; struct objdump_disasm_info *aux; bfd *abfd; asection *sec; unsigned int opb; bfd_boolean want_section; long rel_count; if (sorted_symcount < 1) return NULL; aux = (struct objdump_disasm_info *) inf->application_data; abfd = aux->abfd; sec = inf->section; opb = inf->octets_per_byte; /* Perform a binary search looking for the closest symbol to the required value. We are searching the range (min, max_count]. */ while (min + 1 < max_count) { asymbol *sym; thisplace = (max_count + min) / 2; sym = sorted_syms[thisplace]; if (bfd_asymbol_value (sym) > vma) max_count = thisplace; else if (bfd_asymbol_value (sym) < vma) min = thisplace; else { min = thisplace; break; } } /* The symbol we want is now in min, the low end of the range we were searching. If there are several symbols with the same value, we want the first one. */ thisplace = min; while (thisplace > 0 && (bfd_asymbol_value (sorted_syms[thisplace]) == bfd_asymbol_value (sorted_syms[thisplace - 1]))) --thisplace; /* Prefer a symbol in the current section if we have multple symbols with the same value, as can occur with overlays or zero size sections. */ min = thisplace; while (min < max_count && (bfd_asymbol_value (sorted_syms[min]) == bfd_asymbol_value (sorted_syms[thisplace]))) { if (sym_ok (TRUE, abfd, min, sec, inf)) { thisplace = min; if (place != NULL) *place = thisplace; return sorted_syms[thisplace]; } ++min; } /* If the file is relocatable, and the symbol could be from this section, prefer a symbol from this section over symbols from others, even if the other symbol's value might be closer. Note that this may be wrong for some symbol references if the sections have overlapping memory ranges, but in that case there's no way to tell what's desired without looking at the relocation table. Also give the target a chance to reject symbols. */ want_section = (aux->require_sec || ((abfd->flags & HAS_RELOC) != 0 && vma >= bfd_section_vma (sec) && vma < (bfd_section_vma (sec) + bfd_section_size (sec) / opb))); if (! sym_ok (want_section, abfd, thisplace, sec, inf)) { long i; long newplace = sorted_symcount; for (i = min - 1; i >= 0; i--) { if (sym_ok (want_section, abfd, i, sec, inf)) { if (newplace == sorted_symcount) newplace = i; if (bfd_asymbol_value (sorted_syms[i]) != bfd_asymbol_value (sorted_syms[newplace])) break; /* Remember this symbol and keep searching until we reach an earlier address. */ newplace = i; } } if (newplace != sorted_symcount) thisplace = newplace; else { /* We didn't find a good symbol with a smaller value. Look for one with a larger value. */ for (i = thisplace + 1; i < sorted_symcount; i++) { if (sym_ok (want_section, abfd, i, sec, inf)) { thisplace = i; break; } } } if (! sym_ok (want_section, abfd, thisplace, sec, inf)) /* There is no suitable symbol. */ return NULL; } /* If we have not found an exact match for the specified address and we have dynamic relocations available, then we can produce a better result by matching a relocation to the address and using the symbol associated with that relocation. */ rel_count = aux->dynrelcount; if (!want_section && sorted_syms[thisplace]->value != vma && rel_count > 0 && aux->dynrelbuf != NULL && aux->dynrelbuf[0]->address <= vma && aux->dynrelbuf[rel_count - 1]->address >= vma /* If we have matched a synthetic symbol, then stick with that. */ && (sorted_syms[thisplace]->flags & BSF_SYNTHETIC) == 0) { arelent ** rel_low; arelent ** rel_high; rel_low = aux->dynrelbuf; rel_high = rel_low + rel_count - 1; while (rel_low <= rel_high) { arelent **rel_mid = &rel_low[(rel_high - rel_low) / 2]; arelent * rel = *rel_mid; if (rel->address == vma) { /* Absolute relocations do not provide a more helpful symbolic address. Find a non-absolute relocation with the same address. */ arelent **rel_vma = rel_mid; for (rel_mid--; rel_mid >= rel_low && rel_mid[0]->address == vma; rel_mid--) rel_vma = rel_mid; for (; rel_vma <= rel_high && rel_vma[0]->address == vma; rel_vma++) { rel = *rel_vma; if (rel->sym_ptr_ptr != NULL && ! bfd_is_abs_section ((* rel->sym_ptr_ptr)->section)) { if (place != NULL) * place = thisplace; return * rel->sym_ptr_ptr; } } break; } if (vma < rel->address) rel_high = rel_mid; else if (vma >= rel_mid[1]->address) rel_low = rel_mid + 1; else break; } } if (place != NULL) *place = thisplace; return sorted_syms[thisplace]; } /* Print an address and the offset to the nearest symbol. */ static void objdump_print_addr_with_sym (bfd *abfd, asection *sec, asymbol *sym, bfd_vma vma, struct disassemble_info *inf, bfd_boolean skip_zeroes) { objdump_print_value (vma, inf, skip_zeroes); if (sym == NULL) { bfd_vma secaddr; (*inf->fprintf_func) (inf->stream, " <%s", sanitize_string (bfd_section_name (sec))); secaddr = bfd_section_vma (sec); if (vma < secaddr) { (*inf->fprintf_func) (inf->stream, "-0x"); objdump_print_value (secaddr - vma, inf, TRUE); } else if (vma > secaddr) { (*inf->fprintf_func) (inf->stream, "+0x"); objdump_print_value (vma - secaddr, inf, TRUE); } (*inf->fprintf_func) (inf->stream, ">"); } else { (*inf->fprintf_func) (inf->stream, " <"); objdump_print_symname (abfd, inf, sym); if (bfd_asymbol_value (sym) == vma) ; /* Undefined symbols in an executables and dynamic objects do not have a value associated with them, so it does not make sense to display an offset relative to them. Normally we would not be provided with this kind of symbol, but the target backend might choose to do so, and the code in find_symbol_for_address might return an as yet unresolved symbol associated with a dynamic reloc. */ else if ((bfd_get_file_flags (abfd) & (EXEC_P | DYNAMIC)) && bfd_is_und_section (sym->section)) ; else if (bfd_asymbol_value (sym) > vma) { (*inf->fprintf_func) (inf->stream, "-0x"); objdump_print_value (bfd_asymbol_value (sym) - vma, inf, TRUE); } else if (vma > bfd_asymbol_value (sym)) { (*inf->fprintf_func) (inf->stream, "+0x"); objdump_print_value (vma - bfd_asymbol_value (sym), inf, TRUE); } (*inf->fprintf_func) (inf->stream, ">"); } if (display_file_offsets) inf->fprintf_func (inf->stream, _(" (File Offset: 0x%lx)"), (long int)(sec->filepos + (vma - sec->vma))); } /* Print an address (VMA), symbolically if possible. If SKIP_ZEROES is TRUE, don't output leading zeroes. */ static void objdump_print_addr (bfd_vma vma, struct disassemble_info *inf, bfd_boolean skip_zeroes) { struct objdump_disasm_info *aux; asymbol *sym = NULL; bfd_boolean skip_find = FALSE; aux = (struct objdump_disasm_info *) inf->application_data; if (sorted_symcount < 1) { (*inf->fprintf_func) (inf->stream, "0x"); objdump_print_value (vma, inf, skip_zeroes); if (display_file_offsets) inf->fprintf_func (inf->stream, _(" (File Offset: 0x%lx)"), (long int) (inf->section->filepos + (vma - inf->section->vma))); return; } if (aux->reloc != NULL && aux->reloc->sym_ptr_ptr != NULL && * aux->reloc->sym_ptr_ptr != NULL) { sym = * aux->reloc->sym_ptr_ptr; /* Adjust the vma to the reloc. */ vma += bfd_asymbol_value (sym); if (bfd_is_und_section (bfd_asymbol_section (sym))) skip_find = TRUE; } if (!skip_find) sym = find_symbol_for_address (vma, inf, NULL); objdump_print_addr_with_sym (aux->abfd, inf->section, sym, vma, inf, skip_zeroes); } /* Print VMA to INFO. This function is passed to the disassembler routine. */ static void objdump_print_address (bfd_vma vma, struct disassemble_info *inf) { objdump_print_addr (vma, inf, ! prefix_addresses); } /* Determine if the given address has a symbol associated with it. */ static int objdump_symbol_at_address (bfd_vma vma, struct disassemble_info * inf) { asymbol * sym; sym = find_symbol_for_address (vma, inf, NULL); return (sym != NULL && (bfd_asymbol_value (sym) == vma)); } /* Hold the last function name and the last line number we displayed in a disassembly. */ static char *prev_functionname; static unsigned int prev_line; static unsigned int prev_discriminator; /* We keep a list of all files that we have seen when doing a disassembly with source, so that we know how much of the file to display. This can be important for inlined functions. */ struct print_file_list { struct print_file_list *next; const char *filename; const char *modname; const char *map; size_t mapsize; const char **linemap; unsigned maxline; unsigned last_line; unsigned max_printed; int first; }; static struct print_file_list *print_files; /* The number of preceding context lines to show when we start displaying a file for the first time. */ #define SHOW_PRECEDING_CONTEXT_LINES (5) /* Read a complete file into memory. */ static const char * slurp_file (const char *fn, size_t *size, struct stat *fst) { #ifdef HAVE_MMAP int ps = getpagesize (); size_t msize; #endif const char *map; int fd = open (fn, O_RDONLY | O_BINARY); if (fd < 0) return NULL; if (fstat (fd, fst) < 0) { close (fd); return NULL; } *size = fst->st_size; #ifdef HAVE_MMAP msize = (*size + ps - 1) & ~(ps - 1); map = mmap (NULL, msize, PROT_READ, MAP_SHARED, fd, 0); if (map != (char *) -1L) { close (fd); return map; } #endif map = (const char *) malloc (*size); if (!map || (size_t) read (fd, (char *) map, *size) != *size) { free ((void *) map); map = NULL; } close (fd); return map; } #define line_map_decrease 5 /* Precompute array of lines for a mapped file. */ static const char ** index_file (const char *map, size_t size, unsigned int *maxline) { const char *p, *lstart, *end; int chars_per_line = 45; /* First iteration will use 40. */ unsigned int lineno; const char **linemap = NULL; unsigned long line_map_size = 0; lineno = 0; lstart = map; end = map + size; for (p = map; p < end; p++) { if (*p == '\n') { if (p + 1 < end && p[1] == '\r') p++; } else if (*p == '\r') { if (p + 1 < end && p[1] == '\n') p++; } else continue; /* End of line found. */ if (linemap == NULL || line_map_size < lineno + 1) { unsigned long newsize; chars_per_line -= line_map_decrease; if (chars_per_line <= 1) chars_per_line = 1; line_map_size = size / chars_per_line + 1; if (line_map_size < lineno + 1) line_map_size = lineno + 1; newsize = line_map_size * sizeof (char *); linemap = (const char **) xrealloc (linemap, newsize); } linemap[lineno++] = lstart; lstart = p + 1; } *maxline = lineno; return linemap; } /* Tries to open MODNAME, and if successful adds a node to print_files linked list and returns that node. Returns NULL on failure. */ static struct print_file_list * try_print_file_open (const char *origname, const char *modname, struct stat *fst) { struct print_file_list *p; p = (struct print_file_list *) xmalloc (sizeof (struct print_file_list)); p->map = slurp_file (modname, &p->mapsize, fst); if (p->map == NULL) { free (p); return NULL; } p->linemap = index_file (p->map, p->mapsize, &p->maxline); p->last_line = 0; p->max_printed = 0; p->filename = origname; p->modname = modname; p->next = print_files; p->first = 1; print_files = p; return p; } /* If the source file, as described in the symtab, is not found try to locate it in one of the paths specified with -I If found, add location to print_files linked list. */ static struct print_file_list * update_source_path (const char *filename, bfd *abfd) { struct print_file_list *p; const char *fname; struct stat fst; int i; p = try_print_file_open (filename, filename, &fst); if (p == NULL) { if (include_path_count == 0) return NULL; /* Get the name of the file. */ fname = lbasename (filename); /* If file exists under a new path, we need to add it to the list so that show_line knows about it. */ for (i = 0; i < include_path_count; i++) { char *modname = concat (include_paths[i], "/", fname, (const char *) 0); p = try_print_file_open (filename, modname, &fst); if (p) break; free (modname); } } if (p != NULL) { long mtime = bfd_get_mtime (abfd); if (fst.st_mtime > mtime) warn (_("source file %s is more recent than object file\n"), filename); } return p; } /* Print a source file line. */ static void print_line (struct print_file_list *p, unsigned int linenum) { const char *l; size_t len; --linenum; if (linenum >= p->maxline) return; l = p->linemap [linenum]; if (source_comment != NULL && strlen (l) > 0) printf ("%s", source_comment); len = strcspn (l, "\n\r"); /* Test fwrite return value to quiet glibc warning. */ if (len == 0 || fwrite (l, len, 1, stdout) == 1) putchar ('\n'); } /* Print a range of source code lines. */ static void dump_lines (struct print_file_list *p, unsigned int start, unsigned int end) { if (p->map == NULL) return; while (start <= end) { print_line (p, start); start++; } } /* Show the line number, or the source line, in a disassembly listing. */ static void show_line (bfd *abfd, asection *section, bfd_vma addr_offset) { const char *filename; const char *functionname; unsigned int linenumber; unsigned int discriminator; bfd_boolean reloc; char *path = NULL; if (! with_line_numbers && ! with_source_code) return; if (! bfd_find_nearest_line_discriminator (abfd, section, syms, addr_offset, &filename, &functionname, &linenumber, &discriminator)) return; if (filename != NULL && *filename == '\0') filename = NULL; if (functionname != NULL && *functionname == '\0') functionname = NULL; if (filename && IS_ABSOLUTE_PATH (filename) && prefix) { char *path_up; const char *fname = filename; path = xmalloc (prefix_length + PATH_MAX + 1); if (prefix_length) memcpy (path, prefix, prefix_length); path_up = path + prefix_length; /* Build relocated filename, stripping off leading directories from the initial filename if requested. */ if (prefix_strip > 0) { int level = 0; const char *s; /* Skip selected directory levels. */ for (s = fname + 1; *s != '\0' && level < prefix_strip; s++) if (IS_DIR_SEPARATOR(*s)) { fname = s; level++; } } /* Update complete filename. */ strncpy (path_up, fname, PATH_MAX); path_up[PATH_MAX] = '\0'; filename = path; reloc = TRUE; } else reloc = FALSE; if (with_line_numbers) { if (functionname != NULL && (prev_functionname == NULL || strcmp (functionname, prev_functionname) != 0)) { printf ("%s():\n", sanitize_string (functionname)); prev_line = -1; } if (linenumber > 0 && (linenumber != prev_line || discriminator != prev_discriminator)) { if (discriminator > 0) printf ("%s:%u (discriminator %u)\n", filename == NULL ? "???" : sanitize_string (filename), linenumber, discriminator); else printf ("%s:%u\n", filename == NULL ? "???" : sanitize_string (filename), linenumber); } if (unwind_inlines) { const char *filename2; const char *functionname2; unsigned line2; while (bfd_find_inliner_info (abfd, &filename2, &functionname2, &line2)) { printf ("inlined by %s:%u", sanitize_string (filename2), line2); printf (" (%s)\n", sanitize_string (functionname2)); } } } if (with_source_code && filename != NULL && linenumber > 0) { struct print_file_list **pp, *p; unsigned l; for (pp = &print_files; *pp != NULL; pp = &(*pp)->next) if (filename_cmp ((*pp)->filename, filename) == 0) break; p = *pp; if (p == NULL) { if (reloc) filename = xstrdup (filename); p = update_source_path (filename, abfd); } if (p != NULL && linenumber != p->last_line) { if (file_start_context && p->first) l = 1; else { l = linenumber - SHOW_PRECEDING_CONTEXT_LINES; if (l >= linenumber) l = 1; if (p->max_printed >= l) { if (p->max_printed < linenumber) l = p->max_printed + 1; else l = linenumber; } } dump_lines (p, l, linenumber); if (p->max_printed < linenumber) p->max_printed = linenumber; p->last_line = linenumber; p->first = 0; } } if (functionname != NULL && (prev_functionname == NULL || strcmp (functionname, prev_functionname) != 0)) { if (prev_functionname != NULL) free (prev_functionname); prev_functionname = (char *) xmalloc (strlen (functionname) + 1); strcpy (prev_functionname, functionname); } if (linenumber > 0 && linenumber != prev_line) prev_line = linenumber; if (discriminator != prev_discriminator) prev_discriminator = discriminator; if (path) free (path); } /* Pseudo FILE object for strings. */ typedef struct { char *buffer; size_t pos; size_t alloc; } SFILE; /* sprintf to a "stream". */ static int ATTRIBUTE_PRINTF_2 objdump_sprintf (SFILE *f, const char *format, ...) { size_t n; va_list args; while (1) { size_t space = f->alloc - f->pos; va_start (args, format); n = vsnprintf (f->buffer + f->pos, space, format, args); va_end (args); if (space > n) break; f->alloc = (f->alloc + n) * 2; f->buffer = (char *) xrealloc (f->buffer, f->alloc); } f->pos += n; return n; } /* The number of zeroes we want to see before we start skipping them. The number is arbitrarily chosen. */ #define DEFAULT_SKIP_ZEROES 8 /* The number of zeroes to skip at the end of a section. If the number of zeroes at the end is between SKIP_ZEROES_AT_END and SKIP_ZEROES, they will be disassembled. If there are fewer than SKIP_ZEROES_AT_END, they will be skipped. This is a heuristic attempt to avoid disassembling zeroes inserted by section alignment. */ #define DEFAULT_SKIP_ZEROES_AT_END 3 static int null_print (const void * stream ATTRIBUTE_UNUSED, const char * format ATTRIBUTE_UNUSED, ...) { return 1; } /* Disassemble some data in memory between given values. */ static void disassemble_bytes (struct disassemble_info * inf, disassembler_ftype disassemble_fn, bfd_boolean insns, bfd_byte * data, bfd_vma start_offset, bfd_vma stop_offset, bfd_vma rel_offset, arelent *** relppp, arelent ** relppend) { struct objdump_disasm_info *aux; asection *section; int octets_per_line; int skip_addr_chars; bfd_vma addr_offset; unsigned int opb = inf->octets_per_byte; unsigned int skip_zeroes = inf->skip_zeroes; unsigned int skip_zeroes_at_end = inf->skip_zeroes_at_end; int octets = opb; SFILE sfile; aux = (struct objdump_disasm_info *) inf->application_data; section = inf->section; sfile.alloc = 120; sfile.buffer = (char *) xmalloc (sfile.alloc); sfile.pos = 0; if (insn_width) octets_per_line = insn_width; else if (insns) octets_per_line = 4; else octets_per_line = 16; /* Figure out how many characters to skip at the start of an address, to make the disassembly look nicer. We discard leading zeroes in chunks of 4, ensuring that there is always a leading zero remaining. */ skip_addr_chars = 0; if (! prefix_addresses) { char buf[30]; bfd_sprintf_vma (aux->abfd, buf, section->vma + section->size / opb); while (buf[skip_addr_chars] == '0') ++skip_addr_chars; /* Don't discard zeros on overflow. */ if (buf[skip_addr_chars] == '\0' && section->vma != 0) skip_addr_chars = 0; if (skip_addr_chars != 0) skip_addr_chars = (skip_addr_chars - 1) & -4; } inf->insn_info_valid = 0; addr_offset = start_offset; while (addr_offset < stop_offset) { bfd_vma z; bfd_boolean need_nl = FALSE; octets = 0; /* Make sure we don't use relocs from previous instructions. */ aux->reloc = NULL; /* If we see more than SKIP_ZEROES octets of zeroes, we just print `...'. */ for (z = addr_offset * opb; z < stop_offset * opb; z++) if (data[z] != 0) break; if (! disassemble_zeroes && (inf->insn_info_valid == 0 || inf->branch_delay_insns == 0) && (z - addr_offset * opb >= skip_zeroes || (z == stop_offset * opb && z - addr_offset * opb < skip_zeroes_at_end))) { /* If there are more nonzero octets to follow, we only skip zeroes in multiples of 4, to try to avoid running over the start of an instruction which happens to start with zero. */ if (z != stop_offset * opb) z = addr_offset * opb + ((z - addr_offset * opb) &~ 3); octets = z - addr_offset * opb; /* If we are going to display more data, and we are displaying file offsets, then tell the user how many zeroes we skip and the file offset from where we resume dumping. */ if (display_file_offsets && ((addr_offset + (octets / opb)) < stop_offset)) printf ("\t... (skipping %d zeroes, resuming at file offset: 0x%lx)\n", octets / opb, (unsigned long) (section->filepos + (addr_offset + (octets / opb)))); else printf ("\t...\n"); } else { char buf[50]; int bpc = 0; int pb = 0; if (with_line_numbers || with_source_code) show_line (aux->abfd, section, addr_offset); if (! prefix_addresses) { char *s; bfd_sprintf_vma (aux->abfd, buf, section->vma + addr_offset); for (s = buf + skip_addr_chars; *s == '0'; s++) *s = ' '; if (*s == '\0') *--s = '0'; printf ("%s:\t", buf + skip_addr_chars); } else { aux->require_sec = TRUE; objdump_print_address (section->vma + addr_offset, inf); aux->require_sec = FALSE; putchar (' '); } if (insns) { sfile.pos = 0; inf->fprintf_func = (fprintf_ftype) objdump_sprintf; inf->stream = &sfile; inf->bytes_per_line = 0; inf->bytes_per_chunk = 0; inf->flags = ((disassemble_all ? DISASSEMBLE_DATA : 0) | (wide_output ? WIDE_OUTPUT : 0)); if (machine) inf->flags |= USER_SPECIFIED_MACHINE_TYPE; if (inf->disassembler_needs_relocs && (bfd_get_file_flags (aux->abfd) & EXEC_P) == 0 && (bfd_get_file_flags (aux->abfd) & DYNAMIC) == 0 && *relppp < relppend) { bfd_signed_vma distance_to_rel; int insn_size = 0; int max_reloc_offset = aux->abfd->arch_info->max_reloc_offset_into_insn; distance_to_rel = ((**relppp)->address - rel_offset - addr_offset); if (distance_to_rel > 0 && (max_reloc_offset < 0 || distance_to_rel <= max_reloc_offset)) { /* This reloc *might* apply to the current insn, starting somewhere inside it. Discover the length of the current insn so that the check below will work. */ if (insn_width) insn_size = insn_width; else { /* We find the length by calling the dissassembler function with a dummy print handler. This should work unless the disassembler is not expecting to be called multiple times for the same address. This does mean disassembling the instruction twice, but we only do this when there is a high probability that there is a reloc that will affect the instruction. */ inf->fprintf_func = (fprintf_ftype) null_print; insn_size = disassemble_fn (section->vma + addr_offset, inf); inf->fprintf_func = (fprintf_ftype) objdump_sprintf; } } /* Check to see if the current reloc is associated with the instruction that we are about to disassemble. */ if (distance_to_rel == 0 || (distance_to_rel > 0 && distance_to_rel < insn_size / (int) opb)) { inf->flags |= INSN_HAS_RELOC; aux->reloc = **relppp; } } if (! disassemble_all && (section->flags & (SEC_CODE | SEC_HAS_CONTENTS)) == (SEC_CODE | SEC_HAS_CONTENTS)) /* Set a stop_vma so that the disassembler will not read beyond the next symbol. We assume that symbols appear on the boundaries between instructions. We only do this when disassembling code of course, and when -D is in effect. */ inf->stop_vma = section->vma + stop_offset; inf->stop_offset = stop_offset; octets = (*disassemble_fn) (section->vma + addr_offset, inf); inf->stop_vma = 0; inf->fprintf_func = (fprintf_ftype) fprintf; inf->stream = stdout; if (insn_width == 0 && inf->bytes_per_line != 0) octets_per_line = inf->bytes_per_line; if (octets < (int) opb) { if (sfile.pos) printf ("%s\n", sfile.buffer); if (octets >= 0) { non_fatal (_("disassemble_fn returned length %d"), octets); exit_status = 1; } break; } } else { bfd_vma j; octets = octets_per_line; if (addr_offset + octets / opb > stop_offset) octets = (stop_offset - addr_offset) * opb; for (j = addr_offset * opb; j < addr_offset * opb + octets; ++j) { if (ISPRINT (data[j])) buf[j - addr_offset * opb] = data[j]; else buf[j - addr_offset * opb] = '.'; } buf[j - addr_offset * opb] = '\0'; } if (prefix_addresses ? show_raw_insn > 0 : show_raw_insn >= 0) { bfd_vma j; /* If ! prefix_addresses and ! wide_output, we print octets_per_line octets per line. */ pb = octets; if (pb > octets_per_line && ! prefix_addresses && ! wide_output) pb = octets_per_line; if (inf->bytes_per_chunk) bpc = inf->bytes_per_chunk; else bpc = 1; for (j = addr_offset * opb; j < addr_offset * opb + pb; j += bpc) { /* PR 21580: Check for a buffer ending early. */ if (j + bpc <= stop_offset * opb) { int k; if (inf->display_endian == BFD_ENDIAN_LITTLE) { for (k = bpc - 1; k >= 0; k--) printf ("%02x", (unsigned) data[j + k]); } else { for (k = 0; k < bpc; k++) printf ("%02x", (unsigned) data[j + k]); } } putchar (' '); } for (; pb < octets_per_line; pb += bpc) { int k; for (k = 0; k < bpc; k++) printf (" "); putchar (' '); } /* Separate raw data from instruction by extra space. */ if (insns) putchar ('\t'); else printf (" "); } if (! insns) printf ("%s", buf); else if (sfile.pos) printf ("%s", sfile.buffer); if (prefix_addresses ? show_raw_insn > 0 : show_raw_insn >= 0) { while (pb < octets) { bfd_vma j; char *s; putchar ('\n'); j = addr_offset * opb + pb; bfd_sprintf_vma (aux->abfd, buf, section->vma + j / opb); for (s = buf + skip_addr_chars; *s == '0'; s++) *s = ' '; if (*s == '\0') *--s = '0'; printf ("%s:\t", buf + skip_addr_chars); pb += octets_per_line; if (pb > octets) pb = octets; for (; j < addr_offset * opb + pb; j += bpc) { /* PR 21619: Check for a buffer ending early. */ if (j + bpc <= stop_offset * opb) { int k; if (inf->display_endian == BFD_ENDIAN_LITTLE) { for (k = bpc - 1; k >= 0; k--) printf ("%02x", (unsigned) data[j + k]); } else { for (k = 0; k < bpc; k++) printf ("%02x", (unsigned) data[j + k]); } } putchar (' '); } } } if (!wide_output) putchar ('\n'); else need_nl = TRUE; } while ((*relppp) < relppend && (**relppp)->address < rel_offset + addr_offset + octets / opb) { if (dump_reloc_info || dump_dynamic_reloc_info) { arelent *q; q = **relppp; if (wide_output) putchar ('\t'); else printf ("\t\t\t"); objdump_print_value (section->vma - rel_offset + q->address, inf, TRUE); if (q->howto == NULL) printf (": *unknown*\t"); else if (q->howto->name) printf (": %s\t", q->howto->name); else printf (": %d\t", q->howto->type); if (q->sym_ptr_ptr == NULL || *q->sym_ptr_ptr == NULL) printf ("*unknown*"); else { const char *sym_name; sym_name = bfd_asymbol_name (*q->sym_ptr_ptr); if (sym_name != NULL && *sym_name != '\0') objdump_print_symname (aux->abfd, inf, *q->sym_ptr_ptr); else { asection *sym_sec; sym_sec = bfd_asymbol_section (*q->sym_ptr_ptr); sym_name = bfd_section_name (sym_sec); if (sym_name == NULL || *sym_name == '\0') sym_name = "*unknown*"; printf ("%s", sanitize_string (sym_name)); } } if (q->addend) { bfd_signed_vma addend = q->addend; if (addend < 0) { printf ("-0x"); addend = -addend; } else printf ("+0x"); objdump_print_value (addend, inf, TRUE); } printf ("\n"); need_nl = FALSE; } ++(*relppp); } if (need_nl) printf ("\n"); addr_offset += octets / opb; } free (sfile.buffer); } static void disassemble_section (bfd *abfd, asection *section, void *inf) { const struct elf_backend_data * bed; bfd_vma sign_adjust = 0; struct disassemble_info * pinfo = (struct disassemble_info *) inf; struct objdump_disasm_info * paux; unsigned int opb = pinfo->octets_per_byte; bfd_byte * data = NULL; bfd_size_type datasize = 0; arelent ** rel_pp = NULL; arelent ** rel_ppstart = NULL; arelent ** rel_ppend; bfd_vma stop_offset; asymbol * sym = NULL; long place = 0; long rel_count; bfd_vma rel_offset; unsigned long addr_offset; bfd_boolean do_print; enum loop_control { stop_offset_reached, function_sym, next_sym } loop_until; /* Sections that do not contain machine code are not normally disassembled. */ if (! disassemble_all && only_list == NULL && ((section->flags & (SEC_CODE | SEC_HAS_CONTENTS)) != (SEC_CODE | SEC_HAS_CONTENTS))) return; if (! process_section_p (section)) return; datasize = bfd_section_size (section); if (datasize == 0) return; if (start_address == (bfd_vma) -1 || start_address < section->vma) addr_offset = 0; else addr_offset = start_address - section->vma; if (stop_address == (bfd_vma) -1) stop_offset = datasize / opb; else { if (stop_address < section->vma) stop_offset = 0; else stop_offset = stop_address - section->vma; if (stop_offset > datasize / opb) stop_offset = datasize / opb; } if (addr_offset >= stop_offset) return; /* Decide which set of relocs to use. Load them if necessary. */ paux = (struct objdump_disasm_info *) pinfo->application_data; if (paux->dynrelbuf && dump_dynamic_reloc_info) { rel_pp = paux->dynrelbuf; rel_count = paux->dynrelcount; /* Dynamic reloc addresses are absolute, non-dynamic are section relative. REL_OFFSET specifies the reloc address corresponding to the start of this section. */ rel_offset = section->vma; } else { rel_count = 0; rel_pp = NULL; rel_offset = 0; if ((section->flags & SEC_RELOC) != 0 && (dump_reloc_info || pinfo->disassembler_needs_relocs)) { long relsize; relsize = bfd_get_reloc_upper_bound (abfd, section); if (relsize < 0) bfd_fatal (bfd_get_filename (abfd)); if (relsize > 0) { rel_ppstart = rel_pp = (arelent **) xmalloc (relsize); rel_count = bfd_canonicalize_reloc (abfd, section, rel_pp, syms); if (rel_count < 0) bfd_fatal (bfd_get_filename (abfd)); /* Sort the relocs by address. */ qsort (rel_pp, rel_count, sizeof (arelent *), compare_relocs); } } } rel_ppend = rel_pp + rel_count; if (!bfd_malloc_and_get_section (abfd, section, &data)) { non_fatal (_("Reading section %s failed because: %s"), section->name, bfd_errmsg (bfd_get_error ())); return; } pinfo->buffer = data; pinfo->buffer_vma = section->vma; pinfo->buffer_length = datasize; pinfo->section = section; /* Sort the symbols into value and section order. */ compare_section = section; qsort (sorted_syms, sorted_symcount, sizeof (asymbol *), compare_symbols); /* Skip over the relocs belonging to addresses below the start address. */ while (rel_pp < rel_ppend && (*rel_pp)->address < rel_offset + addr_offset) ++rel_pp; printf (_("\nDisassembly of section %s:\n"), sanitize_string (section->name)); /* Find the nearest symbol forwards from our current position. */ paux->require_sec = TRUE; sym = (asymbol *) find_symbol_for_address (section->vma + addr_offset, (struct disassemble_info *) inf, &place); paux->require_sec = FALSE; /* PR 9774: If the target used signed addresses then we must make sure that we sign extend the value that we calculate for 'addr' in the loop below. */ if (bfd_get_flavour (abfd) == bfd_target_elf_flavour && (bed = get_elf_backend_data (abfd)) != NULL && bed->sign_extend_vma) sign_adjust = (bfd_vma) 1 << (bed->s->arch_size - 1); /* Disassemble a block of instructions up to the address associated with the symbol we have just found. Then print the symbol and find the next symbol on. Repeat until we have disassembled the entire section or we have reached the end of the address range we are interested in. */ do_print = paux->symbol == NULL; loop_until = stop_offset_reached; while (addr_offset < stop_offset) { bfd_vma addr; asymbol *nextsym; bfd_vma nextstop_offset; bfd_boolean insns; addr = section->vma + addr_offset; addr = ((addr & ((sign_adjust << 1) - 1)) ^ sign_adjust) - sign_adjust; if (sym != NULL && bfd_asymbol_value (sym) <= addr) { int x; for (x = place; (x < sorted_symcount && (bfd_asymbol_value (sorted_syms[x]) <= addr)); ++x) continue; pinfo->symbols = sorted_syms + place; pinfo->num_symbols = x - place; pinfo->symtab_pos = place; } else { pinfo->symbols = NULL; pinfo->num_symbols = 0; pinfo->symtab_pos = -1; } /* If we are only disassembling from a specific symbol, check to see if we should start or stop displaying. */ if (sym && paux->symbol) { if (do_print) { /* See if we should stop printing. */ switch (loop_until) { case function_sym: if (sym->flags & BSF_FUNCTION) do_print = FALSE; break; case stop_offset_reached: /* Handled by the while loop. */ break; case next_sym: /* FIXME: There is an implicit assumption here that the name of sym is different from paux->symbol. */ if (! bfd_is_local_label (abfd, sym)) do_print = FALSE; break; } } else { const char * name = bfd_asymbol_name (sym); char * alloc = NULL; if (do_demangle && name[0] != '\0') { /* Demangle the name. */ alloc = bfd_demangle (abfd, name, demangle_flags); if (alloc != NULL) name = alloc; } /* We are not currently printing. Check to see if the current symbol matches the requested symbol. */ if (streq (name, paux->symbol)) { do_print = TRUE; if (sym->flags & BSF_FUNCTION) { if (bfd_get_flavour (abfd) == bfd_target_elf_flavour && ((elf_symbol_type *) sym)->internal_elf_sym.st_size > 0) { /* Sym is a function symbol with a size associated with it. Turn on automatic disassembly for the next VALUE bytes. */ stop_offset = addr_offset + ((elf_symbol_type *) sym)->internal_elf_sym.st_size; loop_until = stop_offset_reached; } else { /* Otherwise we need to tell the loop heuristic to loop until the next function symbol is encountered. */ loop_until = function_sym; } } else { /* Otherwise loop until the next symbol is encountered. */ loop_until = next_sym; } } free (alloc); } } if (! prefix_addresses && do_print) { pinfo->fprintf_func (pinfo->stream, "\n"); objdump_print_addr_with_sym (abfd, section, sym, addr, pinfo, FALSE); pinfo->fprintf_func (pinfo->stream, ":\n"); } if (sym != NULL && bfd_asymbol_value (sym) > addr) nextsym = sym; else if (sym == NULL) nextsym = NULL; else { #define is_valid_next_sym(SYM) \ (strcmp (bfd_section_name ((SYM)->section), bfd_section_name (section)) == 0 \ && (bfd_asymbol_value (SYM) > bfd_asymbol_value (sym)) \ && pinfo->symbol_is_valid (SYM, pinfo)) /* Search forward for the next appropriate symbol in SECTION. Note that all the symbols are sorted together into one big array, and that some sections may have overlapping addresses. */ while (place < sorted_symcount && ! is_valid_next_sym (sorted_syms [place])) ++place; if (place >= sorted_symcount) nextsym = NULL; else nextsym = sorted_syms[place]; } if (sym != NULL && bfd_asymbol_value (sym) > addr) nextstop_offset = bfd_asymbol_value (sym) - section->vma; else if (nextsym == NULL) nextstop_offset = stop_offset; else nextstop_offset = bfd_asymbol_value (nextsym) - section->vma; if (nextstop_offset > stop_offset || nextstop_offset <= addr_offset) nextstop_offset = stop_offset; /* If a symbol is explicitly marked as being an object rather than a function, just dump the bytes without disassembling them. */ if (disassemble_all || sym == NULL || sym->section != section || bfd_asymbol_value (sym) > addr || ((sym->flags & BSF_OBJECT) == 0 && (strstr (bfd_asymbol_name (sym), "gnu_compiled") == NULL) && (strstr (bfd_asymbol_name (sym), "gcc2_compiled") == NULL)) || (sym->flags & BSF_FUNCTION) != 0) insns = TRUE; else insns = FALSE; if (do_print) disassemble_bytes (pinfo, paux->disassemble_fn, insns, data, addr_offset, nextstop_offset, rel_offset, &rel_pp, rel_ppend); addr_offset = nextstop_offset; sym = nextsym; } free (data); if (rel_ppstart != NULL) free (rel_ppstart); } /* Disassemble the contents of an object file. */ static void disassemble_data (bfd *abfd) { struct disassemble_info disasm_info; struct objdump_disasm_info aux; long i; print_files = NULL; prev_functionname = NULL; prev_line = -1; prev_discriminator = 0; /* We make a copy of syms to sort. We don't want to sort syms because that will screw up the relocs. */ sorted_symcount = symcount ? symcount : dynsymcount; sorted_syms = (asymbol **) xmalloc ((sorted_symcount + synthcount) * sizeof (asymbol *)); memcpy (sorted_syms, symcount ? syms : dynsyms, sorted_symcount * sizeof (asymbol *)); sorted_symcount = remove_useless_symbols (sorted_syms, sorted_symcount); for (i = 0; i < synthcount; ++i) { sorted_syms[sorted_symcount] = synthsyms + i; ++sorted_symcount; } init_disassemble_info (&disasm_info, stdout, (fprintf_ftype) fprintf); disasm_info.application_data = (void *) &aux; aux.abfd = abfd; aux.require_sec = FALSE; aux.dynrelbuf = NULL; aux.dynrelcount = 0; aux.reloc = NULL; aux.symbol = disasm_sym; disasm_info.print_address_func = objdump_print_address; disasm_info.symbol_at_address_func = objdump_symbol_at_address; if (machine != NULL) { const bfd_arch_info_type *inf = bfd_scan_arch (machine); if (inf == NULL) fatal (_("can't use supplied machine %s"), machine); abfd->arch_info = inf; } if (endian != BFD_ENDIAN_UNKNOWN) { struct bfd_target *xvec; xvec = (struct bfd_target *) xmalloc (sizeof (struct bfd_target)); memcpy (xvec, abfd->xvec, sizeof (struct bfd_target)); xvec->byteorder = endian; abfd->xvec = xvec; } /* Use libopcodes to locate a suitable disassembler. */ aux.disassemble_fn = disassembler (bfd_get_arch (abfd), bfd_big_endian (abfd), bfd_get_mach (abfd), abfd); if (!aux.disassemble_fn) { non_fatal (_("can't disassemble for architecture %s\n"), bfd_printable_arch_mach (bfd_get_arch (abfd), 0)); exit_status = 1; return; } disasm_info.flavour = bfd_get_flavour (abfd); disasm_info.arch = bfd_get_arch (abfd); disasm_info.mach = bfd_get_mach (abfd); disasm_info.disassembler_options = disassembler_options; disasm_info.octets_per_byte = bfd_octets_per_byte (abfd, NULL); disasm_info.skip_zeroes = DEFAULT_SKIP_ZEROES; disasm_info.skip_zeroes_at_end = DEFAULT_SKIP_ZEROES_AT_END; disasm_info.disassembler_needs_relocs = FALSE; if (bfd_big_endian (abfd)) disasm_info.display_endian = disasm_info.endian = BFD_ENDIAN_BIG; else if (bfd_little_endian (abfd)) disasm_info.display_endian = disasm_info.endian = BFD_ENDIAN_LITTLE; else /* ??? Aborting here seems too drastic. We could default to big or little instead. */ disasm_info.endian = BFD_ENDIAN_UNKNOWN; /* Allow the target to customize the info structure. */ disassemble_init_for_target (& disasm_info); /* Pre-load the dynamic relocs as we may need them during the disassembly. */ { long relsize = bfd_get_dynamic_reloc_upper_bound (abfd); if (relsize < 0 && dump_dynamic_reloc_info) bfd_fatal (bfd_get_filename (abfd)); if (relsize > 0) { aux.dynrelbuf = (arelent **) xmalloc (relsize); aux.dynrelcount = bfd_canonicalize_dynamic_reloc (abfd, aux.dynrelbuf, dynsyms); if (aux.dynrelcount < 0) bfd_fatal (bfd_get_filename (abfd)); /* Sort the relocs by address. */ qsort (aux.dynrelbuf, aux.dynrelcount, sizeof (arelent *), compare_relocs); } } disasm_info.symtab = sorted_syms; disasm_info.symtab_size = sorted_symcount; bfd_map_over_sections (abfd, disassemble_section, & disasm_info); if (aux.dynrelbuf != NULL) free (aux.dynrelbuf); free (sorted_syms); disassemble_free_target (&disasm_info); } static bfd_boolean load_specific_debug_section (enum dwarf_section_display_enum debug, asection *sec, void *file) { struct dwarf_section *section = &debug_displays [debug].section; bfd *abfd = (bfd *) file; bfd_byte *contents; bfd_size_type amt; size_t alloced; if (section->start != NULL) { /* If it is already loaded, do nothing. */ if (streq (section->filename, bfd_get_filename (abfd))) return TRUE; free (section->start); } section->filename = bfd_get_filename (abfd); section->reloc_info = NULL; section->num_relocs = 0; section->address = bfd_section_vma (sec); section->user_data = sec; section->size = bfd_section_size (sec); /* PR 24360: On 32-bit hosts sizeof (size_t) < sizeof (bfd_size_type). */ alloced = amt = section->size + 1; if (alloced != amt || alloced == 0) { section->start = NULL; free_debug_section (debug); printf (_("\nSection '%s' has an invalid size: %#llx.\n"), sanitize_string (section->name), (unsigned long long) section->size); return FALSE; } section->start = contents = malloc (alloced); if (section->start == NULL || !bfd_get_full_section_contents (abfd, sec, &contents)) { free_debug_section (debug); printf (_("\nCan't get contents for section '%s'.\n"), sanitize_string (section->name)); return FALSE; } /* Ensure any string section has a terminating NUL. */ section->start[section->size] = 0; if ((abfd->flags & (EXEC_P | DYNAMIC)) == 0 && debug_displays [debug].relocate) { long reloc_size; bfd_boolean ret; bfd_cache_section_contents (sec, section->start); ret = bfd_simple_get_relocated_section_contents (abfd, sec, section->start, syms) != NULL; if (! ret) { free_debug_section (debug); printf (_("\nCan't get contents for section '%s'.\n"), sanitize_string (section->name)); return FALSE; } reloc_size = bfd_get_reloc_upper_bound (abfd, sec); if (reloc_size > 0) { unsigned long reloc_count; arelent **relocs; relocs = (arelent **) xmalloc (reloc_size); reloc_count = bfd_canonicalize_reloc (abfd, sec, relocs, NULL); if (reloc_count == 0) free (relocs); else { section->reloc_info = relocs; section->num_relocs = reloc_count; } } } return TRUE; } bfd_boolean reloc_at (struct dwarf_section * dsec, dwarf_vma offset) { arelent ** relocs; arelent * rp; if (dsec == NULL || dsec->reloc_info == NULL) return FALSE; relocs = (arelent **) dsec->reloc_info; for (; (rp = * relocs) != NULL; ++ relocs) if (rp->address == offset) return TRUE; return FALSE; } bfd_boolean load_debug_section (enum dwarf_section_display_enum debug, void *file) { struct dwarf_section *section = &debug_displays [debug].section; bfd *abfd = (bfd *) file; asection *sec; /* If it is already loaded, do nothing. */ if (section->start != NULL) { if (streq (section->filename, bfd_get_filename (abfd))) return TRUE; } /* Locate the debug section. */ sec = bfd_get_section_by_name (abfd, section->uncompressed_name); if (sec != NULL) section->name = section->uncompressed_name; else { sec = bfd_get_section_by_name (abfd, section->compressed_name); if (sec != NULL) section->name = section->compressed_name; } if (sec == NULL) return FALSE; return load_specific_debug_section (debug, sec, file); } void free_debug_section (enum dwarf_section_display_enum debug) { struct dwarf_section *section = &debug_displays [debug].section; if (section->start == NULL) return; /* PR 17512: file: 0f67f69d. */ if (section->user_data != NULL) { asection * sec = (asection *) section->user_data; /* If we are freeing contents that are also pointed to by the BFD library's section structure then make sure to update those pointers too. Otherwise, the next time we try to load data for this section we can end up using a stale pointer. */ if (section->start == sec->contents) { sec->contents = NULL; sec->flags &= ~ SEC_IN_MEMORY; sec->compress_status = COMPRESS_SECTION_NONE; } } free ((char *) section->start); section->start = NULL; section->address = 0; section->size = 0; } void close_debug_file (void * file) { bfd * abfd = (bfd *) file; bfd_close (abfd); } void * open_debug_file (const char * pathname) { bfd * data; data = bfd_openr (pathname, NULL); if (data == NULL) return NULL; if (! bfd_check_format (data, bfd_object)) return NULL; return data; } static void dump_dwarf_section (bfd *abfd, asection *section, void *arg ATTRIBUTE_UNUSED) { const char *name = bfd_section_name (section); const char *match; int i; if (CONST_STRNEQ (name, ".gnu.linkonce.wi.")) match = ".debug_info"; else match = name; for (i = 0; i < max; i++) if ((strcmp (debug_displays [i].section.uncompressed_name, match) == 0 || strcmp (debug_displays [i].section.compressed_name, match) == 0) && debug_displays [i].enabled != NULL && *debug_displays [i].enabled) { struct dwarf_section *sec = &debug_displays [i].section; if (strcmp (sec->uncompressed_name, match) == 0) sec->name = sec->uncompressed_name; else sec->name = sec->compressed_name; if (load_specific_debug_section ((enum dwarf_section_display_enum) i, section, abfd)) { debug_displays [i].display (sec, abfd); if (i != info && i != abbrev) free_debug_section ((enum dwarf_section_display_enum) i); } break; } } /* Dump the dwarf debugging information. */ static void dump_dwarf (bfd *abfd) { /* The byte_get pointer should have been set at the start of dump_bfd(). */ if (byte_get == NULL) { warn (_("File %s does not contain any dwarf debug information\n"), bfd_get_filename (abfd)); return; } switch (bfd_get_arch (abfd)) { case bfd_arch_s12z: /* S12Z has a 24 bit address space. But the only known producer of dwarf_info encodes addresses into 32 bits. */ eh_addr_size = 4; break; default: eh_addr_size = bfd_arch_bits_per_address (abfd) / 8; break; } init_dwarf_regnames_by_bfd_arch_and_mach (bfd_get_arch (abfd), bfd_get_mach (abfd)); bfd_map_over_sections (abfd, dump_dwarf_section, NULL); } /* Read ABFD's stabs section STABSECT_NAME, and return a pointer to it. Return NULL on failure. */ static bfd_byte * read_section_stabs (bfd *abfd, const char *sect_name, bfd_size_type *size_ptr, bfd_size_type *entsize_ptr) { asection *stabsect; bfd_byte *contents; stabsect = bfd_get_section_by_name (abfd, sect_name); if (stabsect == NULL) { printf (_("No %s section present\n\n"), sanitize_string (sect_name)); return FALSE; } if (!bfd_malloc_and_get_section (abfd, stabsect, &contents)) { non_fatal (_("reading %s section of %s failed: %s"), sect_name, bfd_get_filename (abfd), bfd_errmsg (bfd_get_error ())); exit_status = 1; free (contents); return NULL; } *size_ptr = bfd_section_size (stabsect); if (entsize_ptr) *entsize_ptr = stabsect->entsize; return contents; } /* Stabs entries use a 12 byte format: 4 byte string table index 1 byte stab type 1 byte stab other field 2 byte stab desc field 4 byte stab value FIXME: This will have to change for a 64 bit object format. */ #define STRDXOFF (0) #define TYPEOFF (4) #define OTHEROFF (5) #define DESCOFF (6) #define VALOFF (8) #define STABSIZE (12) /* Print ABFD's stabs section STABSECT_NAME (in `stabs'), using string table section STRSECT_NAME (in `strtab'). */ static void print_section_stabs (bfd *abfd, const char *stabsect_name, unsigned *string_offset_ptr) { int i; unsigned file_string_table_offset = 0; unsigned next_file_string_table_offset = *string_offset_ptr; bfd_byte *stabp, *stabs_end; stabp = stabs; stabs_end = stabp + stab_size; printf (_("Contents of %s section:\n\n"), sanitize_string (stabsect_name)); printf ("Symnum n_type n_othr n_desc n_value n_strx String\n"); /* Loop through all symbols and print them. We start the index at -1 because there is a dummy symbol on the front of stabs-in-{coff,elf} sections that supplies sizes. */ for (i = -1; stabp <= stabs_end - STABSIZE; stabp += STABSIZE, i++) { const char *name; unsigned long strx; unsigned char type, other; unsigned short desc; bfd_vma value; strx = bfd_h_get_32 (abfd, stabp + STRDXOFF); type = bfd_h_get_8 (abfd, stabp + TYPEOFF); other = bfd_h_get_8 (abfd, stabp + OTHEROFF); desc = bfd_h_get_16 (abfd, stabp + DESCOFF); value = bfd_h_get_32 (abfd, stabp + VALOFF); printf ("\n%-6d ", i); /* Either print the stab name, or, if unnamed, print its number again (makes consistent formatting for tools like awk). */ name = bfd_get_stab_name (type); if (name != NULL) printf ("%-6s", sanitize_string (name)); else if (type == N_UNDF) printf ("HdrSym"); else printf ("%-6d", type); printf (" %-6d %-6d ", other, desc); bfd_printf_vma (abfd, value); printf (" %-6lu", strx); /* Symbols with type == 0 (N_UNDF) specify the length of the string table associated with this file. We use that info to know how to relocate the *next* file's string table indices. */ if (type == N_UNDF) { file_string_table_offset = next_file_string_table_offset; next_file_string_table_offset += value; } else { bfd_size_type amt = strx + file_string_table_offset; /* Using the (possibly updated) string table offset, print the string (if any) associated with this symbol. */ if (amt < stabstr_size) /* PR 17512: file: 079-79389-0.001:0.1. FIXME: May need to sanitize this string before displaying. */ printf (" %.*s", (int)(stabstr_size - amt), strtab + amt); else printf (" *"); } } printf ("\n\n"); *string_offset_ptr = next_file_string_table_offset; } typedef struct { const char * section_name; const char * string_section_name; unsigned string_offset; } stab_section_names; static void find_stabs_section (bfd *abfd, asection *section, void *names) { int len; stab_section_names * sought = (stab_section_names *) names; /* Check for section names for which stabsect_name is a prefix, to handle .stab.N, etc. */ len = strlen (sought->section_name); /* If the prefix matches, and the files section name ends with a nul or a digit, then we match. I.e., we want either an exact match or a section followed by a number. */ if (strncmp (sought->section_name, section->name, len) == 0 && (section->name[len] == 0 || (section->name[len] == '.' && ISDIGIT (section->name[len + 1])))) { if (strtab == NULL) strtab = read_section_stabs (abfd, sought->string_section_name, &stabstr_size, NULL); if (strtab) { stabs = read_section_stabs (abfd, section->name, &stab_size, NULL); if (stabs) print_section_stabs (abfd, section->name, &sought->string_offset); } } } static void dump_stabs_section (bfd *abfd, char *stabsect_name, char *strsect_name) { stab_section_names s; s.section_name = stabsect_name; s.string_section_name = strsect_name; s.string_offset = 0; bfd_map_over_sections (abfd, find_stabs_section, & s); free (strtab); strtab = NULL; } /* Dump the any sections containing stabs debugging information. */ static void dump_stabs (bfd *abfd) { dump_stabs_section (abfd, ".stab", ".stabstr"); dump_stabs_section (abfd, ".stab.excl", ".stab.exclstr"); dump_stabs_section (abfd, ".stab.index", ".stab.indexstr"); /* For Darwin. */ dump_stabs_section (abfd, "LC_SYMTAB.stabs", "LC_SYMTAB.stabstr"); dump_stabs_section (abfd, "$GDB_SYMBOLS$", "$GDB_STRINGS$"); } static void dump_bfd_header (bfd *abfd) { char *comma = ""; printf (_("architecture: %s, "), bfd_printable_arch_mach (bfd_get_arch (abfd), bfd_get_mach (abfd))); printf (_("flags 0x%08x:\n"), abfd->flags & ~BFD_FLAGS_FOR_BFD_USE_MASK); #define PF(x, y) if (abfd->flags & x) {printf("%s%s", comma, y); comma=", ";} PF (HAS_RELOC, "HAS_RELOC"); PF (EXEC_P, "EXEC_P"); PF (HAS_LINENO, "HAS_LINENO"); PF (HAS_DEBUG, "HAS_DEBUG"); PF (HAS_SYMS, "HAS_SYMS"); PF (HAS_LOCALS, "HAS_LOCALS"); PF (DYNAMIC, "DYNAMIC"); PF (WP_TEXT, "WP_TEXT"); PF (D_PAGED, "D_PAGED"); PF (BFD_IS_RELAXABLE, "BFD_IS_RELAXABLE"); printf (_("\nstart address 0x")); bfd_printf_vma (abfd, abfd->start_address); printf ("\n"); } /* Formatting callback function passed to ctf_dump. Returns either the pointer it is passed, or a pointer to newly-allocated storage, in which case dump_ctf() will free it when it no longer needs it. */ static char * dump_ctf_indent_lines (ctf_sect_names_t sect ATTRIBUTE_UNUSED, char *s, void *arg) { const char *blanks = arg; char *new_s; if (asprintf (&new_s, "%s%s", blanks, s) < 0) return s; return new_s; } /* Make a ctfsect suitable for ctf_bfdopen_ctfsect(). */ static ctf_sect_t make_ctfsect (const char *name, bfd_byte *data, bfd_size_type size) { ctf_sect_t ctfsect; ctfsect.cts_name = name; ctfsect.cts_entsize = 1; ctfsect.cts_size = size; ctfsect.cts_data = data; return ctfsect; } /* Dump one CTF archive member. */ static int dump_ctf_archive_member (ctf_file_t *ctf, const char *name, void *arg) { ctf_file_t *parent = (ctf_file_t *) arg; const char *things[] = {"Header", "Labels", "Data objects", "Function objects", "Variables", "Types", "Strings", ""}; const char **thing; size_t i; /* Only print out the name of non-default-named archive members. The name .ctf appears everywhere, even for things that aren't really archives, so printing it out is liable to be confusing. The parent, if there is one, is the default-owned archive member: avoid importing it into itself. (This does no harm, but looks confusing.) */ if (strcmp (name, ".ctf") != 0) { printf (_("\nCTF archive member: %s:\n"), sanitize_string (name)); ctf_import (ctf, parent); } for (i = 0, thing = things; *thing[0]; thing++, i++) { ctf_dump_state_t *s = NULL; char *item; printf ("\n %s:\n", *thing); while ((item = ctf_dump (ctf, &s, i, dump_ctf_indent_lines, (void *) " ")) != NULL) { printf ("%s\n", item); free (item); } if (ctf_errno (ctf)) { non_fatal (_("Iteration failed: %s, %s\n"), *thing, ctf_errmsg (ctf_errno (ctf))); break; } } return 0; } /* Dump the CTF debugging information. */ static void dump_ctf (bfd *abfd, const char *sect_name, const char *parent_name) { ctf_archive_t *ctfa, *parenta = NULL, *lookparent; bfd_byte *ctfdata, *parentdata = NULL; bfd_size_type ctfsize, parentsize; ctf_sect_t ctfsect; ctf_file_t *parent = NULL; int err; if ((ctfdata = read_section_stabs (abfd, sect_name, &ctfsize, NULL)) == NULL) bfd_fatal (bfd_get_filename (abfd)); if (parent_name && (parentdata = read_section_stabs (abfd, parent_name, &parentsize, NULL)) == NULL) bfd_fatal (bfd_get_filename (abfd)); /* Load the CTF file and dump it. */ ctfsect = make_ctfsect (sect_name, ctfdata, ctfsize); if ((ctfa = ctf_bfdopen_ctfsect (abfd, &ctfsect, &err)) == NULL) { non_fatal (_("CTF open failure: %s\n"), ctf_errmsg (err)); bfd_fatal (bfd_get_filename (abfd)); } if (parentdata) { ctfsect = make_ctfsect (parent_name, parentdata, parentsize); if ((parenta = ctf_bfdopen_ctfsect (abfd, &ctfsect, &err)) == NULL) { non_fatal (_("CTF open failure: %s\n"), ctf_errmsg (err)); bfd_fatal (bfd_get_filename (abfd)); } lookparent = parenta; } else lookparent = ctfa; /* Assume that the applicable parent archive member is the default one. (This is what all known implementations are expected to do, if they put CTFs and their parents in archives together.) */ if ((parent = ctf_arc_open_by_name (lookparent, NULL, &err)) == NULL) { non_fatal (_("CTF open failure: %s\n"), ctf_errmsg (err)); bfd_fatal (bfd_get_filename (abfd)); } printf (_("Contents of CTF section %s:\n"), sanitize_string (sect_name)); ctf_archive_iter (ctfa, dump_ctf_archive_member, parent); ctf_file_close (parent); ctf_close (ctfa); ctf_close (parenta); free (parentdata); free (ctfdata); } static void dump_bfd_private_header (bfd *abfd) { if (!bfd_print_private_bfd_data (abfd, stdout)) non_fatal (_("warning: private headers incomplete: %s"), bfd_errmsg (bfd_get_error ())); } static void dump_target_specific (bfd *abfd) { const struct objdump_private_desc * const *desc; struct objdump_private_option *opt; char *e, *b; /* Find the desc. */ for (desc = objdump_private_vectors; *desc != NULL; desc++) if ((*desc)->filter (abfd)) break; if (*desc == NULL) { non_fatal (_("option -P/--private not supported by this file")); return; } /* Clear all options. */ for (opt = (*desc)->options; opt->name; opt++) opt->selected = FALSE; /* Decode options. */ b = dump_private_options; do { e = strchr (b, ','); if (e) *e = 0; for (opt = (*desc)->options; opt->name; opt++) if (strcmp (opt->name, b) == 0) { opt->selected = TRUE; break; } if (opt->name == NULL) non_fatal (_("target specific dump '%s' not supported"), b); if (e) { *e = ','; b = e + 1; } } while (e != NULL); /* Dump. */ (*desc)->dump (abfd); } /* Display a section in hexadecimal format with associated characters. Each line prefixed by the zero padded address. */ static void dump_section (bfd *abfd, asection *section, void *dummy ATTRIBUTE_UNUSED) { bfd_byte *data = NULL; bfd_size_type datasize; bfd_vma addr_offset; bfd_vma start_offset; bfd_vma stop_offset; unsigned int opb = bfd_octets_per_byte (abfd, section); /* Bytes per line. */ const int onaline = 16; char buf[64]; int count; int width; if ((section->flags & SEC_HAS_CONTENTS) == 0) return; if (! process_section_p (section)) return; if ((datasize = bfd_section_size (section)) == 0) return; /* Compute the address range to display. */ if (start_address == (bfd_vma) -1 || start_address < section->vma) start_offset = 0; else start_offset = start_address - section->vma; if (stop_address == (bfd_vma) -1) stop_offset = datasize / opb; else { if (stop_address < section->vma) stop_offset = 0; else stop_offset = stop_address - section->vma; if (stop_offset > datasize / opb) stop_offset = datasize / opb; } if (start_offset >= stop_offset) return; printf (_("Contents of section %s:"), sanitize_string (section->name)); if (display_file_offsets) printf (_(" (Starting at file offset: 0x%lx)"), (unsigned long) (section->filepos + start_offset)); printf ("\n"); if (!bfd_get_full_section_contents (abfd, section, &data)) { non_fatal (_("Reading section %s failed because: %s"), section->name, bfd_errmsg (bfd_get_error ())); return; } width = 4; bfd_sprintf_vma (abfd, buf, start_offset + section->vma); if (strlen (buf) >= sizeof (buf)) abort (); count = 0; while (buf[count] == '0' && buf[count+1] != '\0') count++; count = strlen (buf) - count; if (count > width) width = count; bfd_sprintf_vma (abfd, buf, stop_offset + section->vma - 1); if (strlen (buf) >= sizeof (buf)) abort (); count = 0; while (buf[count] == '0' && buf[count+1] != '\0') count++; count = strlen (buf) - count; if (count > width) width = count; for (addr_offset = start_offset; addr_offset < stop_offset; addr_offset += onaline / opb) { bfd_size_type j; bfd_sprintf_vma (abfd, buf, (addr_offset + section->vma)); count = strlen (buf); if ((size_t) count >= sizeof (buf)) abort (); putchar (' '); while (count < width) { putchar ('0'); count++; } fputs (buf + count - width, stdout); putchar (' '); for (j = addr_offset * opb; j < addr_offset * opb + onaline; j++) { if (j < stop_offset * opb) printf ("%02x", (unsigned) (data[j])); else printf (" "); if ((j & 3) == 3) printf (" "); } printf (" "); for (j = addr_offset * opb; j < addr_offset * opb + onaline; j++) { if (j >= stop_offset * opb) printf (" "); else printf ("%c", ISPRINT (data[j]) ? data[j] : '.'); } putchar ('\n'); } free (data); } /* Actually display the various requested regions. */ static void dump_data (bfd *abfd) { bfd_map_over_sections (abfd, dump_section, NULL); } /* Should perhaps share code and display with nm? */ static void dump_symbols (bfd *abfd ATTRIBUTE_UNUSED, bfd_boolean dynamic) { asymbol **current; long max_count; long count; if (dynamic) { current = dynsyms; max_count = dynsymcount; printf ("DYNAMIC SYMBOL TABLE:\n"); } else { current = syms; max_count = symcount; printf ("SYMBOL TABLE:\n"); } if (max_count == 0) printf (_("no symbols\n")); for (count = 0; count < max_count; count++) { bfd *cur_bfd; if (*current == NULL) printf (_("no information for symbol number %ld\n"), count); else if ((cur_bfd = bfd_asymbol_bfd (*current)) == NULL) printf (_("could not determine the type of symbol number %ld\n"), count); else if (process_section_p ((* current)->section) && (dump_special_syms || !bfd_is_target_special_symbol (cur_bfd, *current))) { const char *name = (*current)->name; if (do_demangle && name != NULL && *name != '\0') { char *alloc; /* If we want to demangle the name, we demangle it here, and temporarily clobber it while calling bfd_print_symbol. FIXME: This is a gross hack. */ alloc = bfd_demangle (cur_bfd, name, demangle_flags); if (alloc != NULL) (*current)->name = alloc; bfd_print_symbol (cur_bfd, stdout, *current, bfd_print_symbol_all); if (alloc != NULL) { (*current)->name = name; free (alloc); } } else bfd_print_symbol (cur_bfd, stdout, *current, bfd_print_symbol_all); printf ("\n"); } current++; } printf ("\n\n"); } static void dump_reloc_set (bfd *abfd, asection *sec, arelent **relpp, long relcount) { arelent **p; char *last_filename, *last_functionname; unsigned int last_line; unsigned int last_discriminator; /* Get column headers lined up reasonably. */ { static int width; if (width == 0) { char buf[30]; bfd_sprintf_vma (abfd, buf, (bfd_vma) -1); width = strlen (buf) - 7; } printf ("OFFSET %*s TYPE %*s VALUE \n", width, "", 12, ""); } last_filename = NULL; last_functionname = NULL; last_line = 0; last_discriminator = 0; for (p = relpp; relcount && *p != NULL; p++, relcount--) { arelent *q = *p; const char *filename, *functionname; unsigned int linenumber; unsigned int discriminator; const char *sym_name; const char *section_name; bfd_vma addend2 = 0; if (start_address != (bfd_vma) -1 && q->address < start_address) continue; if (stop_address != (bfd_vma) -1 && q->address > stop_address) continue; if (with_line_numbers && sec != NULL && bfd_find_nearest_line_discriminator (abfd, sec, syms, q->address, &filename, &functionname, &linenumber, &discriminator)) { if (functionname != NULL && (last_functionname == NULL || strcmp (functionname, last_functionname) != 0)) { printf ("%s():\n", sanitize_string (functionname)); if (last_functionname != NULL) free (last_functionname); last_functionname = xstrdup (functionname); } if (linenumber > 0 && (linenumber != last_line || (filename != NULL && last_filename != NULL && filename_cmp (filename, last_filename) != 0) || (discriminator != last_discriminator))) { if (discriminator > 0) printf ("%s:%u\n", filename == NULL ? "???" : sanitize_string (filename), linenumber); else printf ("%s:%u (discriminator %u)\n", filename == NULL ? "???" : sanitize_string (filename), linenumber, discriminator); last_line = linenumber; last_discriminator = discriminator; if (last_filename != NULL) free (last_filename); if (filename == NULL) last_filename = NULL; else last_filename = xstrdup (filename); } } if (q->sym_ptr_ptr && *q->sym_ptr_ptr) { sym_name = (*(q->sym_ptr_ptr))->name; section_name = (*(q->sym_ptr_ptr))->section->name; } else { sym_name = NULL; section_name = NULL; } bfd_printf_vma (abfd, q->address); if (q->howto == NULL) printf (" *unknown* "); else if (q->howto->name) { const char *name = q->howto->name; /* R_SPARC_OLO10 relocations contain two addends. But because 'arelent' lacks enough storage to store them both, the 64-bit ELF Sparc backend records this as two relocations. One R_SPARC_LO10 and one R_SPARC_13, both pointing to the same address. This is merely so that we have some place to store both addend fields. Undo this transformation, otherwise the output will be confusing. */ if (abfd->xvec->flavour == bfd_target_elf_flavour && elf_tdata(abfd)->elf_header->e_machine == EM_SPARCV9 && relcount > 1 && !strcmp (q->howto->name, "R_SPARC_LO10")) { arelent *q2 = *(p + 1); if (q2 != NULL && q2->howto && q->address == q2->address && !strcmp (q2->howto->name, "R_SPARC_13")) { name = "R_SPARC_OLO10"; addend2 = q2->addend; p++; } } printf (" %-16s ", name); } else printf (" %-16d ", q->howto->type); if (sym_name) { objdump_print_symname (abfd, NULL, *q->sym_ptr_ptr); } else { if (section_name == NULL) section_name = "*unknown*"; printf ("[%s]", sanitize_string (section_name)); } if (q->addend) { bfd_signed_vma addend = q->addend; if (addend < 0) { printf ("-0x"); addend = -addend; } else printf ("+0x"); bfd_printf_vma (abfd, addend); } if (addend2) { printf ("+0x"); bfd_printf_vma (abfd, addend2); } printf ("\n"); } if (last_filename != NULL) free (last_filename); if (last_functionname != NULL) free (last_functionname); } static void dump_relocs_in_section (bfd *abfd, asection *section, void *dummy ATTRIBUTE_UNUSED) { arelent **relpp = NULL; long relcount; long relsize; if ( bfd_is_abs_section (section) || bfd_is_und_section (section) || bfd_is_com_section (section) || (! process_section_p (section)) || ((section->flags & SEC_RELOC) == 0)) return; printf ("RELOCATION RECORDS FOR [%s]:", sanitize_string (section->name)); relsize = bfd_get_reloc_upper_bound (abfd, section); if (relsize == 0) { printf (" (none)\n\n"); return; } if (relsize < 0) relcount = relsize; else { relpp = (arelent **) xmalloc (relsize); relcount = bfd_canonicalize_reloc (abfd, section, relpp, syms); } if (relcount < 0) { printf ("\n"); non_fatal (_("failed to read relocs in: %s"), sanitize_string (bfd_get_filename (abfd))); bfd_fatal (_("error message was")); } else if (relcount == 0) printf (" (none)\n\n"); else { printf ("\n"); dump_reloc_set (abfd, section, relpp, relcount); printf ("\n\n"); } free (relpp); } static void dump_relocs (bfd *abfd) { bfd_map_over_sections (abfd, dump_relocs_in_section, NULL); } static void dump_dynamic_relocs (bfd *abfd) { long relsize; arelent **relpp; long relcount; relsize = bfd_get_dynamic_reloc_upper_bound (abfd); if (relsize < 0) bfd_fatal (bfd_get_filename (abfd)); printf ("DYNAMIC RELOCATION RECORDS"); if (relsize == 0) printf (" (none)\n\n"); else { relpp = (arelent **) xmalloc (relsize); relcount = bfd_canonicalize_dynamic_reloc (abfd, relpp, dynsyms); if (relcount < 0) bfd_fatal (bfd_get_filename (abfd)); else if (relcount == 0) printf (" (none)\n\n"); else { printf ("\n"); dump_reloc_set (abfd, NULL, relpp, relcount); printf ("\n\n"); } free (relpp); } } /* Creates a table of paths, to search for source files. */ static void add_include_path (const char *path) { if (path[0] == 0) return; include_path_count++; include_paths = (const char **) xrealloc (include_paths, include_path_count * sizeof (*include_paths)); #ifdef HAVE_DOS_BASED_FILE_SYSTEM if (path[1] == ':' && path[2] == 0) path = concat (path, ".", (const char *) 0); #endif include_paths[include_path_count - 1] = path; } static void adjust_addresses (bfd *abfd ATTRIBUTE_UNUSED, asection *section, void *arg) { if ((section->flags & SEC_DEBUGGING) == 0) { bfd_boolean *has_reloc_p = (bfd_boolean *) arg; section->vma += adjust_section_vma; if (*has_reloc_p) section->lma += adjust_section_vma; } } /* Return the sign-extended form of an ARCH_SIZE sized VMA. */ static bfd_vma sign_extend_address (bfd *abfd ATTRIBUTE_UNUSED, bfd_vma vma, unsigned arch_size) { bfd_vma mask; mask = (bfd_vma) 1 << (arch_size - 1); return (((vma & ((mask << 1) - 1)) ^ mask) - mask); } /* Dump selected contents of ABFD. */ static void dump_bfd (bfd *abfd, bfd_boolean is_mainfile) { const struct elf_backend_data * bed; if (bfd_big_endian (abfd)) byte_get = byte_get_big_endian; else if (bfd_little_endian (abfd)) byte_get = byte_get_little_endian; else byte_get = NULL; /* Load any separate debug information files. We do this now and without checking do_follow_links because separate debug info files may contain symbol tables that we will need when displaying information about the main file. Any memory allocated by load_separate_debug_files will be released when we call free_debug_memory below. The test on is_mainfile is there because the chain of separate debug info files is a global variable shared by all invocations of dump_bfd. */ if (is_mainfile) { load_separate_debug_files (abfd, bfd_get_filename (abfd)); /* If asked to do so, recursively dump the separate files. */ if (do_follow_links) { separate_info * i; for (i = first_separate_info; i != NULL; i = i->next) dump_bfd (i->handle, FALSE); } } /* Adjust user-specified start and stop limits for targets that use signed addresses. */ if (bfd_get_flavour (abfd) == bfd_target_elf_flavour && (bed = get_elf_backend_data (abfd)) != NULL && bed->sign_extend_vma) { start_address = sign_extend_address (abfd, start_address, bed->s->arch_size); stop_address = sign_extend_address (abfd, stop_address, bed->s->arch_size); } /* If we are adjusting section VMA's, change them all now. Changing the BFD information is a hack. However, we must do it, or bfd_find_nearest_line will not do the right thing. */ if (adjust_section_vma != 0) { bfd_boolean has_reloc = (abfd->flags & HAS_RELOC); bfd_map_over_sections (abfd, adjust_addresses, &has_reloc); } if (! dump_debugging_tags && ! suppress_bfd_header) printf (_("\n%s: file format %s\n"), sanitize_string (bfd_get_filename (abfd)), abfd->xvec->name); if (dump_ar_hdrs) print_arelt_descr (stdout, abfd, TRUE, FALSE); if (dump_file_header) dump_bfd_header (abfd); if (dump_private_headers) dump_bfd_private_header (abfd); if (dump_private_options != NULL) dump_target_specific (abfd); if (! dump_debugging_tags && ! suppress_bfd_header) putchar ('\n'); if (dump_symtab || dump_reloc_info || disassemble || dump_debugging || dump_dwarf_section_info) { syms = slurp_symtab (abfd); /* If following links, load any symbol tables from the linked files as well. */ if (do_follow_links && is_mainfile) { separate_info * i; for (i = first_separate_info; i != NULL; i = i->next) { asymbol ** extra_syms; long old_symcount = symcount; extra_syms = slurp_symtab (i->handle); if (extra_syms) { if (old_symcount == 0) { syms = extra_syms; } else { syms = xrealloc (syms, (symcount + old_symcount) * sizeof (asymbol *)); memcpy (syms + old_symcount, extra_syms, symcount * sizeof (asymbol *)); } } symcount += old_symcount; } } } if (dump_section_headers) dump_headers (abfd); if (dump_dynamic_symtab || dump_dynamic_reloc_info || (disassemble && bfd_get_dynamic_symtab_upper_bound (abfd) > 0)) dynsyms = slurp_dynamic_symtab (abfd); if (disassemble) { synthcount = bfd_get_synthetic_symtab (abfd, symcount, syms, dynsymcount, dynsyms, &synthsyms); if (synthcount < 0) synthcount = 0; } if (dump_symtab) dump_symbols (abfd, FALSE); if (dump_dynamic_symtab) dump_symbols (abfd, TRUE); if (dump_dwarf_section_info) dump_dwarf (abfd); if (dump_ctf_section_info) dump_ctf (abfd, dump_ctf_section_name, dump_ctf_parent_name); if (dump_stab_section_info) dump_stabs (abfd); if (dump_reloc_info && ! disassemble) dump_relocs (abfd); if (dump_dynamic_reloc_info && ! disassemble) dump_dynamic_relocs (abfd); if (dump_section_contents) dump_data (abfd); if (disassemble) disassemble_data (abfd); if (dump_debugging) { void *dhandle; dhandle = read_debugging_info (abfd, syms, symcount, TRUE); if (dhandle != NULL) { if (!print_debugging_info (stdout, dhandle, abfd, syms, bfd_demangle, dump_debugging_tags ? TRUE : FALSE)) { non_fatal (_("%s: printing debugging information failed"), bfd_get_filename (abfd)); exit_status = 1; } free (dhandle); } /* PR 6483: If there was no STABS debug info in the file, try DWARF instead. */ else if (! dump_dwarf_section_info) { dwarf_select_sections_all (); dump_dwarf (abfd); } } if (syms) { free (syms); syms = NULL; } if (dynsyms) { free (dynsyms); dynsyms = NULL; } if (synthsyms) { free (synthsyms); synthsyms = NULL; } symcount = 0; dynsymcount = 0; synthcount = 0; if (is_mainfile) free_debug_memory (); } static void display_object_bfd (bfd *abfd) { char **matching; if (bfd_check_format_matches (abfd, bfd_object, &matching)) { dump_bfd (abfd, TRUE); return; } if (bfd_get_error () == bfd_error_file_ambiguously_recognized) { nonfatal (bfd_get_filename (abfd)); list_matching_formats (matching); free (matching); return; } if (bfd_get_error () != bfd_error_file_not_recognized) { nonfatal (bfd_get_filename (abfd)); return; } if (bfd_check_format_matches (abfd, bfd_core, &matching)) { dump_bfd (abfd, TRUE); return; } nonfatal (bfd_get_filename (abfd)); if (bfd_get_error () == bfd_error_file_ambiguously_recognized) { list_matching_formats (matching); free (matching); } } static void display_any_bfd (bfd *file, int level) { /* Decompress sections unless dumping the section contents. */ if (!dump_section_contents) file->flags |= BFD_DECOMPRESS; /* If the file is an archive, process all of its elements. */ if (bfd_check_format (file, bfd_archive)) { bfd *arfile = NULL; bfd *last_arfile = NULL; if (level == 0) printf (_("In archive %s:\n"), sanitize_string (bfd_get_filename (file))); else if (level > 100) { /* Prevent corrupted files from spinning us into an infinite loop. 100 is an arbitrary heuristic. */ fatal (_("Archive nesting is too deep")); return; } else printf (_("In nested archive %s:\n"), sanitize_string (bfd_get_filename (file))); for (;;) { bfd_set_error (bfd_error_no_error); arfile = bfd_openr_next_archived_file (file, arfile); if (arfile == NULL) { if (bfd_get_error () != bfd_error_no_more_archived_files) nonfatal (bfd_get_filename (file)); break; } display_any_bfd (arfile, level + 1); if (last_arfile != NULL) { bfd_close (last_arfile); /* PR 17512: file: ac585d01. */ if (arfile == last_arfile) { last_arfile = NULL; break; } } last_arfile = arfile; } if (last_arfile != NULL) bfd_close (last_arfile); } else display_object_bfd (file); } static void display_file (char *filename, char *target, bfd_boolean last_file) { bfd *file; if (get_file_size (filename) < 1) { exit_status = 1; return; } file = bfd_openr (filename, target); if (file == NULL) { nonfatal (filename); return; } display_any_bfd (file, 0); /* This is an optimization to improve the speed of objdump, especially when dumping a file with lots of associated debug informatiom. Calling bfd_close on such a file can take a non-trivial amount of time as there are lots of lists to walk and buffers to free. This is only really necessary however if we are about to load another file and we need the memory back. Otherwise, if we are about to exit, then we can save (a lot of) time by only doing a quick close, and allowing the OS to reclaim the memory for us. */ if (! last_file) bfd_close (file); else bfd_close_all_done (file); } int main (int argc, char **argv) { int c; char *target = default_target; bfd_boolean seenflag = FALSE; #if defined (HAVE_SETLOCALE) #if defined (HAVE_LC_MESSAGES) setlocale (LC_MESSAGES, ""); #endif setlocale (LC_CTYPE, ""); #endif bindtextdomain (PACKAGE, LOCALEDIR); textdomain (PACKAGE); program_name = *argv; xmalloc_set_program_name (program_name); bfd_set_error_program_name (program_name); START_PROGRESS (program_name, 0); expandargv (&argc, &argv); if (bfd_init () != BFD_INIT_MAGIC) fatal (_("fatal error: libbfd ABI mismatch")); set_default_bfd_target (); while ((c = getopt_long (argc, argv, "pP:ib:m:M:VvCdDlfFaHhrRtTxsSI:j:wE:zgeGW::", long_options, (int *) 0)) != EOF) { switch (c) { case 0: break; /* We've been given a long option. */ case 'm': machine = optarg; break; case 'M': { char *options; if (disassembler_options) /* Ignore potential memory leak for now. */ options = concat (disassembler_options, ",", optarg, (const char *) NULL); else options = optarg; disassembler_options = remove_whitespace_and_extra_commas (options); } break; case 'j': add_only (optarg); break; case 'F': display_file_offsets = TRUE; break; case 'l': with_line_numbers = TRUE; break; case 'b': target = optarg; break; case 'C': do_demangle = TRUE; if (optarg != NULL) { enum demangling_styles style; style = cplus_demangle_name_to_style (optarg); if (style == unknown_demangling) fatal (_("unknown demangling style `%s'"), optarg); cplus_demangle_set_style (style); } break; case OPTION_RECURSE_LIMIT: demangle_flags &= ~ DMGL_NO_RECURSE_LIMIT; break; case OPTION_NO_RECURSE_LIMIT: demangle_flags |= DMGL_NO_RECURSE_LIMIT; break; case 'w': do_wide = wide_output = TRUE; break; case OPTION_ADJUST_VMA: adjust_section_vma = parse_vma (optarg, "--adjust-vma"); break; case OPTION_START_ADDRESS: start_address = parse_vma (optarg, "--start-address"); if ((stop_address != (bfd_vma) -1) && stop_address <= start_address) fatal (_("error: the start address should be before the end address")); break; case OPTION_STOP_ADDRESS: stop_address = parse_vma (optarg, "--stop-address"); if ((start_address != (bfd_vma) -1) && stop_address <= start_address) fatal (_("error: the stop address should be after the start address")); break; case OPTION_PREFIX: prefix = optarg; prefix_length = strlen (prefix); /* Remove an unnecessary trailing '/' */ while (IS_DIR_SEPARATOR (prefix[prefix_length - 1])) prefix_length--; break; case OPTION_PREFIX_STRIP: prefix_strip = atoi (optarg); if (prefix_strip < 0) fatal (_("error: prefix strip must be non-negative")); break; case OPTION_INSN_WIDTH: insn_width = strtoul (optarg, NULL, 0); if (insn_width <= 0) fatal (_("error: instruction width must be positive")); break; case OPTION_INLINES: unwind_inlines = TRUE; break; case 'E': if (strcmp (optarg, "B") == 0) endian = BFD_ENDIAN_BIG; else if (strcmp (optarg, "L") == 0) endian = BFD_ENDIAN_LITTLE; else { nonfatal (_("unrecognized -E option")); usage (stderr, 1); } break; case OPTION_ENDIAN: if (strncmp (optarg, "big", strlen (optarg)) == 0) endian = BFD_ENDIAN_BIG; else if (strncmp (optarg, "little", strlen (optarg)) == 0) endian = BFD_ENDIAN_LITTLE; else { non_fatal (_("unrecognized --endian type `%s'"), optarg); exit_status = 1; usage (stderr, 1); } break; case 'f': dump_file_header = TRUE; seenflag = TRUE; break; case 'i': formats_info = TRUE; seenflag = TRUE; break; case 'I': add_include_path (optarg); break; case 'p': dump_private_headers = TRUE; seenflag = TRUE; break; case 'P': dump_private_options = optarg; seenflag = TRUE; break; case 'x': dump_private_headers = TRUE; dump_symtab = TRUE; dump_reloc_info = TRUE; dump_file_header = TRUE; dump_ar_hdrs = TRUE; dump_section_headers = TRUE; seenflag = TRUE; break; case 't': dump_symtab = TRUE; seenflag = TRUE; break; case 'T': dump_dynamic_symtab = TRUE; seenflag = TRUE; break; case 'd': disassemble = TRUE; seenflag = TRUE; disasm_sym = optarg; break; case 'z': disassemble_zeroes = TRUE; break; case 'D': disassemble = TRUE; disassemble_all = TRUE; seenflag = TRUE; break; case 'S': disassemble = TRUE; with_source_code = TRUE; seenflag = TRUE; break; case OPTION_SOURCE_COMMENT: disassemble = TRUE; with_source_code = TRUE; seenflag = TRUE; if (optarg) source_comment = xstrdup (sanitize_string (optarg)); else source_comment = xstrdup ("# "); break; case 'g': dump_debugging = 1; seenflag = TRUE; break; case 'e': dump_debugging = 1; dump_debugging_tags = 1; do_demangle = TRUE; seenflag = TRUE; break; case 'W': dump_dwarf_section_info = TRUE; seenflag = TRUE; if (optarg) dwarf_select_sections_by_letters (optarg); else dwarf_select_sections_all (); break; case OPTION_DWARF: dump_dwarf_section_info = TRUE; seenflag = TRUE; if (optarg) dwarf_select_sections_by_names (optarg); else dwarf_select_sections_all (); break; case OPTION_DWARF_DEPTH: { char *cp; dwarf_cutoff_level = strtoul (optarg, & cp, 0); } break; case OPTION_DWARF_START: { char *cp; dwarf_start_die = strtoul (optarg, & cp, 0); suppress_bfd_header = 1; } break; case OPTION_DWARF_CHECK: dwarf_check = TRUE; break; case OPTION_CTF: dump_ctf_section_info = TRUE; dump_ctf_section_name = xstrdup (optarg); seenflag = TRUE; break; case OPTION_CTF_PARENT: dump_ctf_parent_name = xstrdup (optarg); break; case 'G': dump_stab_section_info = TRUE; seenflag = TRUE; break; case 's': dump_section_contents = TRUE; seenflag = TRUE; break; case 'r': dump_reloc_info = TRUE; seenflag = TRUE; break; case 'R': dump_dynamic_reloc_info = TRUE; seenflag = TRUE; break; case 'a': dump_ar_hdrs = TRUE; seenflag = TRUE; break; case 'h': dump_section_headers = TRUE; seenflag = TRUE; break; case 'v': case 'V': show_version = TRUE; seenflag = TRUE; break; case 'H': usage (stdout, 0); /* No need to set seenflag or to break - usage() does not return. */ default: usage (stderr, 1); } } if (show_version) print_version ("objdump"); if (!seenflag) usage (stderr, 2); if (formats_info) exit_status = display_info (); else { if (optind == argc) display_file ("a.out", target, TRUE); else for (; optind < argc;) { display_file (argv[optind], target, optind == argc - 1); optind++; } } free_only_list (); free (dump_ctf_section_name); free (dump_ctf_parent_name); free ((void *) source_comment); END_PROGRESS (program_name); return exit_status; }