readelf - Displays information about ELF files.
readelf [-a|--all] [-h|--file-header] [-l|--program-headers|--segments] [-S|--section-headers|--sections] [-g|--section-groups] [-t|--section-details] [-e|--headers] [-s|--syms|--symbols] [--dyn-syms] [-n|--notes] [-r|--relocs] [-u|--unwind] [-d|--dynamic] [-V|--version-info] [-A|--arch-specific] [-D|--use-dynamic] [-x <number or name>|--hex-dump=<number or name>] [-p <number or name>|--string-dump=<number or name>] [-R <number or name>|--relocated-dump=<number or name>] [-z|--decompress] [-c|--archive-index] [-w[lLiaprmfFsoRt]| --debug-dump[=rawline,=decodedline,=info,=abbrev,=pubnames,=aranges,=macro,=frames,=frames-interp,=str,=loc,=Ranges,=pubtypes,=trace_info,=trace_abbrev,=trace_aranges,=gdb_index]] [--dwarf-depth=n] [--dwarf-start=n] [-I|--histogram] [-v|--version] [-W|--wide] [-H|--help] elffile...
readelf displays information about one or more ELF format object files. The options control what particular information to display. elffile... are the object files to be examined. 32-bit and 64-bit ELF files are supported, as are archives containing ELF files. This program performs a similar function to objdump but it goes into more detail and it exists independently of the BFD library, so if there is a bug in BFD then readelf will not be affected.
The long and short forms of options, shown here as alternatives, are equivalent. At least one option besides -v or -H must be given. -a --all Equivalent to specifying --file-header, --program-headers, --sections, --symbols, --relocs, --dynamic, --notes and --version-info. -h --file-header Displays the information contained in the ELF header at the start of the file. -l --program-headers --segments Displays the information contained in the file's segment headers, if it has any. -S --sections --section-headers Displays the information contained in the file's section headers, if it has any. -g --section-groups Displays the information contained in the file's section groups, if it has any. -t --section-details Displays the detailed section information. Implies -S. -s --symbols --syms Displays the entries in symbol table section of the file, if it has one. If a symbol has version information associated with it then this is displayed as well. The version string is displayed as a suffix to the symbol name, preceeded by an @ character. For example foo@VER_1. If the version is the default version to be used when resolving unversioned references to the symbol then it is displayed as a suffix preceeded by two @ characters. For example foo@@VER_2. --dyn-syms Displays the entries in dynamic symbol table section of the file, if it has one. The output format is the same as the format used by the --syms option. -e --headers Display all the headers in the file. Equivalent to -h -l -S. -n --notes Displays the contents of the NOTE segments and/or sections, if any. -r --relocs Displays the contents of the file's relocation section, if it has one. -u --unwind Displays the contents of the file's unwind section, if it has one. Only the unwind sections for IA64 ELF files, as well as ARM unwind tables (".ARM.exidx" / ".ARM.extab") are currently supported. -d --dynamic Displays the contents of the file's dynamic section, if it has one. -V --version-info Displays the contents of the version sections in the file, it they exist. -A --arch-specific Displays architecture-specific information in the file, if there is any. -D --use-dynamic When displaying symbols, this option makes readelf use the symbol hash tables in the file's dynamic section, rather than the symbol table sections. -x <number or name> --hex-dump=<number or name> Displays the contents of the indicated section as a hexadecimal bytes. A number identifies a particular section by index in the section table; any other string identifies all sections with that name in the object file. -R <number or name> --relocated-dump=<number or name> Displays the contents of the indicated section as a hexadecimal bytes. A number identifies a particular section by index in the section table; any other string identifies all sections with that name in the object file. The contents of the section will be relocated before they are displayed. -p <number or name> --string-dump=<number or name> Displays the contents of the indicated section as printable strings. A number identifies a particular section by index in the section table; any other string identifies all sections with that name in the object file. -z --decompress Requests that the section(s) being dumped by x, R or p options are decompressed before being displayed. If the section(s) are not compressed then they are displayed as is. -c --archive-index Displays the file symbol index information contained in the header part of binary archives. Performs the same function as the t command to ar, but without using the BFD library. -w[lLiaprmfFsoRt] --debug-dump[=rawline,=decodedline,=info,=abbrev,=pubnames,=aranges,=macro,=frames,=frames-interp,=str,=loc,=Ranges,=pubtypes,=trace_info,=trace_abbrev,=trace_aranges,=gdb_index] Displays the contents of the debug sections in the file, if any are present. If one of the optional letters or words follows the switch then only data found in those specific sections will be dumped. Note that there is no single letter option to display the content of trace sections or .gdb_index. Note: the =decodedline option will display the interpreted contents of a .debug_line section whereas the =rawline option dumps the contents in a raw format. Note: the =frames-interp option will display the interpreted contents of a .debug_frame section whereas the =frames option dumps the contents in a raw format. Note: the output from the =info option can also be affected by the options --dwarf-depth and --dwarf-start. --dwarf-depth=n Limit the dump of the ".debug_info" section to n children. This is only useful with --debug-dump=info. The default is to print all DIEs; the special value 0 for n will also have this effect. With a non-zero value for n, DIEs at or deeper than n levels will not be printed. The range for n is zero-based. --dwarf-start=n Print only DIEs beginning with the DIE numbered n. This is only useful with --debug-dump=info. If specified, this option will suppress printing of any header information and all DIEs before the DIE numbered n. Only siblings and children of the specified DIE will be printed. This can be used in conjunction with --dwarf-depth. -I --histogram Display a histogram of bucket list lengths when displaying the contents of the symbol tables. -v --version Display the version number of readelf. -W --wide Don't break output lines to fit into 80 columns. By default readelf breaks section header and segment listing lines for 64-bit ELF files, so that they fit into 80 columns. This option causes readelf to print each section header resp. each segment one a single line, which is far more readable on terminals wider than 80 columns. -H --help Display the command line options understood by readelf. @file Read command-line options from file. The options read are inserted in place of the original @file option. If file does not exist, or cannot be read, then the option will be treated literally, and not removed. Options in file are separated by whitespace. A whitespace character may be included in an option by surrounding the entire option in either single or double quotes. Any character (including a backslash) may be included by prefixing the character to be included with a backslash. The file may itself contain additional @file options; any such options will be processed recursively.
objdump(1), and the Info entries for binutils.
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