1OBJDUMP(1) GNU Development Tools OBJDUMP(1)
2
6 objdump - display information from object files
7
9 objdump [-a|--archive-headers]
10 [-b bfdname|--target=bfdname]
11 [-C|--demangle[=style] ]
12 [-d|--disassemble[=symbol]]
13 [-D|--disassemble-all]
14 [-z|--disassemble-zeroes]
15 [-EB|-EL|--endian={big | little }]
16 [-f|--file-headers]
17 [-F|--file-offsets]
18 [--file-start-context]
19 [-g|--debugging]
20 [-e|--debugging-tags]
21 [-h|--section-headers|--headers]
22 [-i|--info]
23 [-j section|--section=section]
24 [-l|--line-numbers]
25 [-S|--source]
26 [--source-comment[=text]]
27 [-m machine|--architecture=machine]
28 [-M options|--disassembler-options=options]
29 [-p|--private-headers]
30 [-P options|--private=options]
31 [-r|--reloc]
32 [-R|--dynamic-reloc]
33 [-s|--full-contents]
34 [-W[lLiaprmfFsoORtUuTgAck]|
35 --dwarf[=rawline,=decodedline,=info,=abbrev,=pubnames,=aranges,=macro,=frames,=frames-interp,=str,=str-offsets,=loc,=Ranges,=pubtypes,=trace_info,=trace_abbrev,=trace_aranges,=gdb_index,=addr,=cu_index,=links]]
36 [-WK|--dwarf=follow-links]
37 [-WN|--dwarf=no-follow-links]
38 [-L|--process-links]
39 [--ctf=section]
40 [-G|--stabs]
41 [-t|--syms]
42 [-T|--dynamic-syms]
43 [-x|--all-headers]
44 [-w|--wide]
45 [--start-address=address]
46 [--stop-address=address]
47 [--no-addresses]
48 [--prefix-addresses]
49 [--[no-]show-raw-insn]
50 [--adjust-vma=offset]
51 [--dwarf-depth=n]
52 [--dwarf-start=n]
53 [--ctf-parent=section]
54 [--no-recurse-limit|--recurse-limit]
55 [--special-syms]
56 [--prefix=prefix]
57 [--prefix-strip=level]
58 [--insn-width=width]
59 [--visualize-jumps[=color|=extended-color|=off]
60 [-U method] [--unicode=method]
61 [-V|--version]
62 [-H|--help]
63 objfile...
64
66 objdump displays information about one or more object files. The
67 options control what particular information to display. This
68 information is mostly useful to programmers who are working on the
69 compilation tools, as opposed to programmers who just want their
70 program to compile and work.
71 objfile... are the object files to be examined. When you specify
73 archives, objdump shows information on each of the member object files.
74
76 The long and short forms of options, shown here as alternatives, are
77 equivalent. At least one option from the list
78 -a,-d,-D,-e,-f,-g,-G,-h,-H,-p,-P,-r,-R,-s,-S,-t,-T,-V,-x must be given.
79 -a
81 --archive-header
82 If any of the objfile files are archives, display the archive
83 header information (in a format similar to ls -l). Besides the
84 information you could list with ar tv, objdump -a shows the object
85 file format of each archive member.
86 --adjust-vma=offset
88 When dumping information, first add offset to all the section
89 addresses. This is useful if the section addresses do not
90 correspond to the symbol table, which can happen when putting
91 sections at particular addresses when using a format which can not
92 represent section addresses, such as a.out.
93 -b bfdname
95 --target=bfdname
96 Specify that the object-code format for the object files is
97 bfdname. This option may not be necessary; objdump can
98 automatically recognize many formats.
99 For example,
101 objdump -b oasys -m vax -h fu.o
103 displays summary information from the section headers (-h) of fu.o,
105 which is explicitly identified (-m) as a VAX object file in the
106 format produced by Oasys compilers. You can list the formats
107 available with the -i option.
108 -C
110 --demangle[=style]
111 Decode (demangle) low-level symbol names into user-level names.
112 Besides removing any initial underscore prepended by the system,
113 this makes C++ function names readable. Different compilers have
114 different mangling styles. The optional demangling style argument
115 can be used to choose an appropriate demangling style for your
116 compiler.
117 --recurse-limit
119 --no-recurse-limit
120 --recursion-limit
121 --no-recursion-limit
122 Enables or disables a limit on the amount of recursion performed
123 whilst demangling strings. Since the name mangling formats allow
124 for an infinite level of recursion it is possible to create strings
125 whose decoding will exhaust the amount of stack space available on
126 the host machine, triggering a memory fault. The limit tries to
127 prevent this from happening by restricting recursion to 2048 levels
128 of nesting.
129 The default is for this limit to be enabled, but disabling it may
131 be necessary in order to demangle truly complicated names. Note
132 however that if the recursion limit is disabled then stack
133 exhaustion is possible and any bug reports about such an event will
134 be rejected.
135 -g
137 --debugging
138 Display debugging information. This attempts to parse STABS
139 debugging format information stored in the file and print it out
140 using a C like syntax. If no STABS debugging was found this option
141 falls back on the -W option to print any DWARF information in the
142 file.
143 -e
145 --debugging-tags
146 Like -g, but the information is generated in a format compatible
147 with ctags tool.
148 -d
150 --disassemble
151 --disassemble=symbol
152 Display the assembler mnemonics for the machine instructions from
153 the input file. This option only disassembles those sections which
154 are expected to contain instructions. If the optional symbol
155 argument is given, then display the assembler mnemonics starting at
156 symbol. If symbol is a function name then disassembly will stop at
157 the end of the function, otherwise it will stop when the next
158 symbol is encountered. If there are no matches for symbol then
159 nothing will be displayed.
160 Note if the --dwarf=follow-links option is enabled then any symbol
162 tables in linked debug info files will be read in and used when
163 disassembling.
164 -D
166 --disassemble-all
167 Like -d, but disassemble the contents of all sections, not just
168 those expected to contain instructions.
169 This option also has a subtle effect on the disassembly of
171 instructions in code sections. When option -d is in effect objdump
172 will assume that any symbols present in a code section occur on the
173 boundary between instructions and it will refuse to disassemble
174 across such a boundary. When option -D is in effect however this
175 assumption is supressed. This means that it is possible for the
176 output of -d and -D to differ if, for example, data is stored in
177 code sections.
178 If the target is an ARM architecture this switch also has the
180 effect of forcing the disassembler to decode pieces of data found
181 in code sections as if they were instructions.
182 Note if the --dwarf=follow-links option is enabled then any symbol
184 tables in linked debug info files will be read in and used when
185 disassembling.
186 --no-addresses
188 When disassembling, don't print addresses on each line or for
189 symbols and relocation offsets. In combination with
190 --no-show-raw-insn this may be useful for comparing compiler
191 output.
192 --prefix-addresses
194 When disassembling, print the complete address on each line. This
195 is the older disassembly format.
196 -EB
198 -EL
199 --endian={big|little}
200 Specify the endianness of the object files. This only affects
201 disassembly. This can be useful when disassembling a file format
202 which does not describe endianness information, such as S-records.
203 -f
205 --file-headers
206 Display summary information from the overall header of each of the
207 objfile files.
208 -F
210 --file-offsets
211 When disassembling sections, whenever a symbol is displayed, also
212 display the file offset of the region of data that is about to be
213 dumped. If zeroes are being skipped, then when disassembly
214 resumes, tell the user how many zeroes were skipped and the file
215 offset of the location from where the disassembly resumes. When
216 dumping sections, display the file offset of the location from
217 where the dump starts.
218 --file-start-context
220 Specify that when displaying interlisted source code/disassembly
221 (assumes -S) from a file that has not yet been displayed, extend
222 the context to the start of the file.
223 -h
225 --section-headers
226 --headers
227 Display summary information from the section headers of the object
228 file.
229 File segments may be relocated to nonstandard addresses, for
231 example by using the -Ttext, -Tdata, or -Tbss options to ld.
232 However, some object file formats, such as a.out, do not store the
233 starting address of the file segments. In those situations,
234 although ld relocates the sections correctly, using objdump -h to
235 list the file section headers cannot show the correct addresses.
236 Instead, it shows the usual addresses, which are implicit for the
237 target.
238 Note, in some cases it is possible for a section to have both the
240 READONLY and the NOREAD attributes set. In such cases the NOREAD
241 attribute takes precedence, but objdump will report both since the
242 exact setting of the flag bits might be important.
243 -H
245 --help
246 Print a summary of the options to objdump and exit.
247 -i
249 --info
250 Display a list showing all architectures and object formats
251 available for specification with -b or -m.
252 -j name
254 --section=name
255 Display information only for section name.
256 -L
258 --process-links
259 Display the contents of non-debug sections found in separate
260 debuginfo files that are linked to the main file. This option
261 automatically implies the -WK option, and only sections requested
262 by other command line options will be displayed.
263 -l
265 --line-numbers
266 Label the display (using debugging information) with the filename
267 and source line numbers corresponding to the object code or relocs
268 shown. Only useful with -d, -D, or -r.
269 -m machine
271 --architecture=machine
272 Specify the architecture to use when disassembling object files.
273 This can be useful when disassembling object files which do not
274 describe architecture information, such as S-records. You can list
275 the available architectures with the -i option.
276 If the target is an ARM architecture then this switch has an
278 additional effect. It restricts the disassembly to only those
279 instructions supported by the architecture specified by machine.
280 If it is necessary to use this switch because the input file does
281 not contain any architecture information, but it is also desired to
282 disassemble all the instructions use -marm.
283 -M options
285 --disassembler-options=options
286 Pass target specific information to the disassembler. Only
287 supported on some targets. If it is necessary to specify more than
288 one disassembler option then multiple -M options can be used or can
289 be placed together into a comma separated list.
290 For ARC, dsp controls the printing of DSP instructions, spfp
292 selects the printing of FPX single precision FP instructions, dpfp
293 selects the printing of FPX double precision FP instructions,
294 quarkse_em selects the printing of special QuarkSE-EM instructions,
295 fpuda selects the printing of double precision assist instructions,
296 fpus selects the printing of FPU single precision FP instructions,
297 while fpud selects the printing of FPU double precision FP
298 instructions. Additionally, one can choose to have all the
299 immediates printed in hexadecimal using hex. By default, the short
300 immediates are printed using the decimal representation, while the
301 long immediate values are printed as hexadecimal.
302 cpu=... allows one to enforce a particular ISA when disassembling
304 instructions, overriding the -m value or whatever is in the ELF
305 file. This might be useful to select ARC EM or HS ISA, because
306 architecture is same for those and disassembler relies on private
307 ELF header data to decide if code is for EM or HS. This option
308 might be specified multiple times - only the latest value will be
309 used. Valid values are same as for the assembler -mcpu=... option.
310 If the target is an ARM architecture then this switch can be used
312 to select which register name set is used during disassembler.
313 Specifying -M reg-names-std (the default) will select the register
314 names as used in ARM's instruction set documentation, but with
315 register 13 called 'sp', register 14 called 'lr' and register 15
316 called 'pc'. Specifying -M reg-names-apcs will select the name set
317 used by the ARM Procedure Call Standard, whilst specifying -M reg-
318 names-raw will just use r followed by the register number.
319 There are also two variants on the APCS register naming scheme
321 enabled by -M reg-names-atpcs and -M reg-names-special-atpcs which
322 use the ARM/Thumb Procedure Call Standard naming conventions.
323 (Either with the normal register names or the special register
324 names).
325 This option can also be used for ARM architectures to force the
327 disassembler to interpret all instructions as Thumb instructions by
328 using the switch --disassembler-options=force-thumb. This can be
329 useful when attempting to disassemble thumb code produced by other
330 compilers.
331 For AArch64 targets this switch can be used to set whether
333 instructions are disassembled as the most general instruction using
334 the -M no-aliases option or whether instruction notes should be
335 generated as comments in the disasssembly using -M notes.
336 For the x86, some of the options duplicate functions of the -m
338 switch, but allow finer grained control.
339 "x86-64"
341 "i386"
342 "i8086"
343 Select disassembly for the given architecture.
344 "intel"
346 "att"
347 Select between intel syntax mode and AT&T syntax mode.
348 "amd64"
350 "intel64"
351 Select between AMD64 ISA and Intel64 ISA.
352 "intel-mnemonic"
354 "att-mnemonic"
355 Select between intel mnemonic mode and AT&T mnemonic mode.
356 Note: "intel-mnemonic" implies "intel" and "att-mnemonic"
357 implies "att".
358 "addr64"
360 "addr32"
361 "addr16"
362 "data32"
363 "data16"
364 Specify the default address size and operand size. These five
365 options will be overridden if "x86-64", "i386" or "i8086"
366 appear later in the option string.
367 "suffix"
369 When in AT&T mode and also for a limited set of instructions
370 when in Intel mode, instructs the disassembler to print a
371 mnemonic suffix even when the suffix could be inferred by the
372 operands or, for certain instructions, the execution mode's
373 defaults.
374 For PowerPC, the -M argument raw selects disasssembly of hardware
376 insns rather than aliases. For example, you will see "rlwinm"
377 rather than "clrlwi", and "addi" rather than "li". All of the -m
378 arguments for gas that select a CPU are supported. These are: 403,
379 405, 440, 464, 476, 601, 603, 604, 620, 7400, 7410, 7450, 7455,
380 750cl, 821, 850, 860, a2, booke, booke32, cell, com, e200z4, e300,
381 e500, e500mc, e500mc64, e500x2, e5500, e6500, efs, power4, power5,
382 power6, power7, power8, power9, power10, ppc, ppc32, ppc64,
383 ppc64bridge, ppcps, pwr, pwr2, pwr4, pwr5, pwr5x, pwr6, pwr7, pwr8,
384 pwr9, pwr10, pwrx, titan, and vle. 32 and 64 modify the default or
385 a prior CPU selection, disabling and enabling 64-bit insns
386 respectively. In addition, altivec, any, htm, vsx, and spe add
387 capabilities to a previous or later CPU selection. any will
388 disassemble any opcode known to binutils, but in cases where an
389 opcode has two different meanings or different arguments, you may
390 not see the disassembly you expect. If you disassemble without
391 giving a CPU selection, a default will be chosen from information
392 gleaned by BFD from the object files headers, but the result again
393 may not be as you expect.
394 For MIPS, this option controls the printing of instruction mnemonic
396 names and register names in disassembled instructions. Multiple
397 selections from the following may be specified as a comma separated
398 string, and invalid options are ignored:
399 "no-aliases"
401 Print the 'raw' instruction mnemonic instead of some pseudo
402 instruction mnemonic. I.e., print 'daddu' or 'or' instead of
403 'move', 'sll' instead of 'nop', etc.
404 "msa"
406 Disassemble MSA instructions.
407 "virt"
409 Disassemble the virtualization ASE instructions.
410 "xpa"
412 Disassemble the eXtended Physical Address (XPA) ASE
413 instructions.
414 "gpr-names=ABI"
416 Print GPR (general-purpose register) names as appropriate for
417 the specified ABI. By default, GPR names are selected
418 according to the ABI of the binary being disassembled.
419 "fpr-names=ABI"
421 Print FPR (floating-point register) names as appropriate for
422 the specified ABI. By default, FPR numbers are printed rather
423 than names.
424 "cp0-names=ARCH"
426 Print CP0 (system control coprocessor; coprocessor 0) register
427 names as appropriate for the CPU or architecture specified by
428 ARCH. By default, CP0 register names are selected according to
429 the architecture and CPU of the binary being disassembled.
430 "hwr-names=ARCH"
432 Print HWR (hardware register, used by the "rdhwr" instruction)
433 names as appropriate for the CPU or architecture specified by
434 ARCH. By default, HWR names are selected according to the
435 architecture and CPU of the binary being disassembled.
436 "reg-names=ABI"
438 Print GPR and FPR names as appropriate for the selected ABI.
439 "reg-names=ARCH"
441 Print CPU-specific register names (CP0 register and HWR names)
442 as appropriate for the selected CPU or architecture.
443 For any of the options listed above, ABI or ARCH may be specified
445 as numeric to have numbers printed rather than names, for the
446 selected types of registers. You can list the available values of
447 ABI and ARCH using the --help option.
448 For VAX, you can specify function entry addresses with -M
450 entry:0xf00ba. You can use this multiple times to properly
451 disassemble VAX binary files that don't contain symbol tables (like
452 ROM dumps). In these cases, the function entry mask would
453 otherwise be decoded as VAX instructions, which would probably lead
454 the rest of the function being wrongly disassembled.
455 -p
457 --private-headers
458 Print information that is specific to the object file format. The
459 exact information printed depends upon the object file format. For
460 some object file formats, no additional information is printed.
461 -P options
463 --private=options
464 Print information that is specific to the object file format. The
465 argument options is a comma separated list that depends on the
466 format (the lists of options is displayed with the help).
467 For XCOFF, the available options are:
469 "header"
471 "aout"
472 "sections"
473 "syms"
474 "relocs"
475 "lineno,"
476 "loader"
477 "except"
478 "typchk"
479 "traceback"
480 "toc"
481 "ldinfo"
482 Not all object formats support this option. In particular the ELF
484 format does not use it.
485 -r
487 --reloc
488 Print the relocation entries of the file. If used with -d or -D,
489 the relocations are printed interspersed with the disassembly.
490 -R
492 --dynamic-reloc
493 Print the dynamic relocation entries of the file. This is only
494 meaningful for dynamic objects, such as certain types of shared
495 libraries. As for -r, if used with -d or -D, the relocations are
496 printed interspersed with the disassembly.
497 -s
499 --full-contents
500 Display the full contents of any sections requested. By default
501 all non-empty sections are displayed.
502 -S
504 --source
505 Display source code intermixed with disassembly, if possible.
506 Implies -d.
507 --source-comment[=txt]
509 Like the -S option, but all source code lines are displayed with a
510 prefix of txt. Typically txt will be a comment string which can be
511 used to distinguish the assembler code from the source code. If
512 txt is not provided then a default string of "# " (hash followed by
513 a space), will be used.
514 --prefix=prefix
516 Specify prefix to add to the absolute paths when used with -S.
517 --prefix-strip=level
519 Indicate how many initial directory names to strip off the
520 hardwired absolute paths. It has no effect without --prefix=prefix.
521 --show-raw-insn
523 When disassembling instructions, print the instruction in hex as
524 well as in symbolic form. This is the default except when
525 --prefix-addresses is used.
526 --no-show-raw-insn
528 When disassembling instructions, do not print the instruction
529 bytes. This is the default when --prefix-addresses is used.
530 --insn-width=width
532 Display width bytes on a single line when disassembling
533 instructions.
534 --visualize-jumps[=color|=extended-color|=off]
536 Visualize jumps that stay inside a function by drawing ASCII art
537 between the start and target addresses. The optional =color
538 argument adds color to the output using simple terminal colors.
539 Alternatively the =extended-color argument will add color using
540 8bit colors, but these might not work on all terminals.
541 If it is necessary to disable the visualize-jumps option after it
543 has previously been enabled then use visualize-jumps=off.
544 -W[lLiaprmfFsoORtUuTgAckK]
546 --dwarf[=rawline,=decodedline,=info,=abbrev,=pubnames,=aranges,=macro,=frames,=frames-interp,=str,=str-offsets,=loc,=Ranges,=pubtypes,=trace_info,=trace_abbrev,=trace_aranges,=gdb_index,=addr,=cu_index,=links,=follow-links]
547 Displays the contents of the DWARF debug sections in the file, if
548 any are present. Compressed debug sections are automatically
549 decompressed (temporarily) before they are displayed. If one or
550 more of the optional letters or words follows the switch then only
551 those type(s) of data will be dumped. The letters and words refer
552 to the following information:
553 "a"
555 "=abbrev"
556 Displays the contents of the .debug_abbrev section.
557 "A"
559 "=addr"
560 Displays the contents of the .debug_addr section.
561 "c"
563 "=cu_index"
564 Displays the contents of the .debug_cu_index and/or
565 .debug_tu_index sections.
566 "f"
568 "=frames"
569 Display the raw contents of a .debug_frame section.
570 "F"
572 "=frames-interp"
573 Display the interpreted contents of a .debug_frame section.
574 "g"
576 "=gdb_index"
577 Displays the contents of the .gdb_index and/or .debug_names
578 sections.
579 "i"
581 "=info"
582 Displays the contents of the .debug_info section. Note: the
583 output from this option can also be restricted by the use of
584 the --dwarf-depth and --dwarf-start options.
585 "k"
587 "=links"
588 Displays the contents of the .gnu_debuglink, .gnu_debugaltlink
589 and .debug_sup sections, if any of them are present. Also
590 displays any links to separate dwarf object files (dwo), if
591 they are specified by the DW_AT_GNU_dwo_name or DW_AT_dwo_name
592 attributes in the .debug_info section.
593 "K"
595 "=follow-links"
596 Display the contents of any selected debug sections that are
597 found in linked, separate debug info file(s). This can result
598 in multiple versions of the same debug section being displayed
599 if it exists in more than one file.
600 In addition, when displaying DWARF attributes, if a form is
602 found that references the separate debug info file, then the
603 referenced contents will also be displayed.
604 Note - in some distributions this option is enabled by default.
606 It can be disabled via the N debug option. The default can be
607 chosen when configuring the binutils via the
608 --enable-follow-debug-links=yes or
609 --enable-follow-debug-links=no options. If these are not used
610 then the default is to enable the following of debug links.
611 "N"
613 "=no-follow-links"
614 Disables the following of links to separate debug info files.
615 "l"
617 "=rawline"
618 Displays the contents of the .debug_line section in a raw
619 format.
620 "L"
622 "=decodedline"
623 Displays the interpreted contents of the .debug_line section.
624 "m"
626 "=macro"
627 Displays the contents of the .debug_macro and/or .debug_macinfo
628 sections.
629 "o"
631 "=loc"
632 Displays the contents of the .debug_loc and/or .debug_loclists
633 sections.
634 "O"
636 "=str-offsets"
637 Displays the contents of the .debug_str_offsets section.
638 "p"
640 "=pubnames"
641 Displays the contents of the .debug_pubnames and/or
642 .debug_gnu_pubnames sections.
643 "r"
645 "=aranges"
646 Displays the contents of the .debug_aranges section.
647 "R"
649 "=Ranges"
650 Displays the contents of the .debug_ranges and/or
651 .debug_rnglists sections.
652 "s"
654 "=str"
655 Displays the contents of the .debug_str, .debug_line_str and/or
656 .debug_str_offsets sections.
657 "t"
659 "=pubtype"
660 Displays the contents of the .debug_pubtypes and/or
661 .debug_gnu_pubtypes sections.
662 "T"
664 "=trace_aranges"
665 Displays the contents of the .trace_aranges section.
666 "u"
668 "=trace_abbrev"
669 Displays the contents of the .trace_abbrev section.
670 "U"
672 "=trace_info"
673 Displays the contents of the .trace_info section.
674 Note: displaying the contents of .debug_static_funcs,
676 .debug_static_vars and debug_weaknames sections is not currently
677 supported.
678 --dwarf-depth=n
680 Limit the dump of the ".debug_info" section to n children. This is
681 only useful with --debug-dump=info. The default is to print all
682 DIEs; the special value 0 for n will also have this effect.
683 With a non-zero value for n, DIEs at or deeper than n levels will
685 not be printed. The range for n is zero-based.
686 --dwarf-start=n
688 Print only DIEs beginning with the DIE numbered n. This is only
689 useful with --debug-dump=info.
690 If specified, this option will suppress printing of any header
692 information and all DIEs before the DIE numbered n. Only siblings
693 and children of the specified DIE will be printed.
694 This can be used in conjunction with --dwarf-depth.
696 --dwarf-check
698 Enable additional checks for consistency of Dwarf information.
699 --ctf[=section]
701 Display the contents of the specified CTF section. CTF sections
702 themselves contain many subsections, all of which are displayed in
703 order.
704 By default, display the name of the section named .ctf, which is
706 the name emitted by ld.
707 --ctf-parent=member
709 If the CTF section contains ambiguously-defined types, it will
710 consist of an archive of many CTF dictionaries, all inheriting from
711 one dictionary containing unambiguous types. This member is by
712 default named .ctf, like the section containing it, but it is
713 possible to change this name using the
714 "ctf_link_set_memb_name_changer" function at link time. When
715 looking at CTF archives that have been created by a linker that
716 uses the name changer to rename the parent archive member,
717 --ctf-parent can be used to specify the name used for the parent.
718 -G
720 --stabs
721 Display the full contents of any sections requested. Display the
722 contents of the .stab and .stab.index and .stab.excl sections from
723 an ELF file. This is only useful on systems (such as Solaris 2.0)
724 in which ".stab" debugging symbol-table entries are carried in an
725 ELF section. In most other file formats, debugging symbol-table
726 entries are interleaved with linkage symbols, and are visible in
727 the --syms output.
728 --start-address=address
730 Start displaying data at the specified address. This affects the
731 output of the -d, -r and -s options.
732 --stop-address=address
734 Stop displaying data at the specified address. This affects the
735 output of the -d, -r and -s options.
736 -t
738 --syms
739 Print the symbol table entries of the file. This is similar to the
740 information provided by the nm program, although the display format
741 is different. The format of the output depends upon the format of
742 the file being dumped, but there are two main types. One looks
743 like this:
744 [ 4](sec 3)(fl 0x00)(ty 0)(scl 3) (nx 1) 0x00000000 .bss
746 [ 6](sec 1)(fl 0x00)(ty 0)(scl 2) (nx 0) 0x00000000 fred
747 where the number inside the square brackets is the number of the
749 entry in the symbol table, the sec number is the section number,
750 the fl value are the symbol's flag bits, the ty number is the
751 symbol's type, the scl number is the symbol's storage class and the
752 nx value is the number of auxiliary entries associated with the
753 symbol. The last two fields are the symbol's value and its name.
754 The other common output format, usually seen with ELF based files,
756 looks like this:
757 00000000 l d .bss 00000000 .bss
759 00000000 g .text 00000000 fred
760 Here the first number is the symbol's value (sometimes referred to
762 as its address). The next field is actually a set of characters
763 and spaces indicating the flag bits that are set on the symbol.
764 These characters are described below. Next is the section with
765 which the symbol is associated or *ABS* if the section is absolute
766 (ie not connected with any section), or *UND* if the section is
767 referenced in the file being dumped, but not defined there.
768 After the section name comes another field, a number, which for
770 common symbols is the alignment and for other symbol is the size.
771 Finally the symbol's name is displayed.
772 The flag characters are divided into 7 groups as follows:
774 "l"
776 "g"
777 "u"
778 "!" The symbol is a local (l), global (g), unique global (u),
779 neither global nor local (a space) or both global and local
780 (!). A symbol can be neither local or global for a variety of
781 reasons, e.g., because it is used for debugging, but it is
782 probably an indication of a bug if it is ever both local and
783 global. Unique global symbols are a GNU extension to the
784 standard set of ELF symbol bindings. For such a symbol the
785 dynamic linker will make sure that in the entire process there
786 is just one symbol with this name and type in use.
787 "w" The symbol is weak (w) or strong (a space).
789 "C" The symbol denotes a constructor (C) or an ordinary symbol (a
791 space).
792 "W" The symbol is a warning (W) or a normal symbol (a space). A
794 warning symbol's name is a message to be displayed if the
795 symbol following the warning symbol is ever referenced.
796 "I"
798 "i" The symbol is an indirect reference to another symbol (I), a
799 function to be evaluated during reloc processing (i) or a
800 normal symbol (a space).
801 "d"
803 "D" The symbol is a debugging symbol (d) or a dynamic symbol (D) or
804 a normal symbol (a space).
805 "F"
807 "f"
808 "O" The symbol is the name of a function (F) or a file (f) or an
809 object (O) or just a normal symbol (a space).
810 -T
812 --dynamic-syms
813 Print the dynamic symbol table entries of the file. This is only
814 meaningful for dynamic objects, such as certain types of shared
815 libraries. This is similar to the information provided by the nm
816 program when given the -D (--dynamic) option.
817 The output format is similar to that produced by the --syms option,
819 except that an extra field is inserted before the symbol's name,
820 giving the version information associated with the symbol. If the
821 version is the default version to be used when resolving
822 unversioned references to the symbol then it's displayed as is,
823 otherwise it's put into parentheses.
824 --special-syms
826 When displaying symbols include those which the target considers to
827 be special in some way and which would not normally be of interest
828 to the user.
829 -U [d|i|l|e|x|h]
831 --unicode=[default|invalid|locale|escape|hex|highlight]
832 Controls the display of UTF-8 encoded multibyte characters in
833 strings. The default (--unicode=default) is to give them no
834 special treatment. The --unicode=locale option displays the
835 sequence in the current locale, which may or may not support them.
836 The options --unicode=hex and --unicode=invalid display them as hex
837 byte sequences enclosed by either angle brackets or curly braces.
838 The --unicode=escape option displays them as escape sequences
840 (\uxxxx) and the --unicode=highlight option displays them as escape
841 sequences highlighted in red (if supported by the output device).
842 The colouring is intended to draw attention to the presence of
843 unicode sequences where they might not be expected.
844 -V
846 --version
847 Print the version number of objdump and exit.
848 -x
850 --all-headers
851 Display all available header information, including the symbol
852 table and relocation entries. Using -x is equivalent to specifying
853 all of -a -f -h -p -r -t.
854 -w
856 --wide
857 Format some lines for output devices that have more than 80
858 columns. Also do not truncate symbol names when they are
859 displayed.
860 -z
862 --disassemble-zeroes
863 Normally the disassembly output will skip blocks of zeroes. This
864 option directs the disassembler to disassemble those blocks, just
865 like any other data.
866 @file
868 Read command-line options from file. The options read are inserted
869 in place of the original @file option. If file does not exist, or
870 cannot be read, then the option will be treated literally, and not
871 removed.
872 Options in file are separated by whitespace. A whitespace
874 character may be included in an option by surrounding the entire
875 option in either single or double quotes. Any character (including
876 a backslash) may be included by prefixing the character to be
877 included with a backslash. The file may itself contain additional
878 @file options; any such options will be processed recursively.
879
881 nm(1), readelf(1), and the Info entries for binutils.
882
884 Copyright (c) 1991-2022 Free Software Foundation, Inc.
885 Permission is granted to copy, distribute and/or modify this document
887 under the terms of the GNU Free Documentation License, Version 1.3 or
888 any later version published by the Free Software Foundation; with no
889 Invariant Sections, with no Front-Cover Texts, and with no Back-Cover
890 Texts. A copy of the license is included in the section entitled "GNU
891 Free Documentation License".
892binutils-2.38 2022-07-20 OBJDUMP(1)