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 [-wD|--dwarf=use-debuginfod]
39 [-wE|--dwarf=do-not-use-debuginfod]
40 [-L|--process-links]
41 [--ctf=section]
42 [--sframe=section]
43 [-G|--stabs]
44 [-t|--syms]
45 [-T|--dynamic-syms]
46 [-x|--all-headers]
47 [-w|--wide]
48 [--start-address=address]
49 [--stop-address=address]
50 [--no-addresses]
51 [--prefix-addresses]
52 [--[no-]show-raw-insn]
53 [--adjust-vma=offset]
54 [--show-all-symbols]
55 [--dwarf-depth=n]
56 [--dwarf-start=n]
57 [--ctf-parent=section]
58 [--no-recurse-limit|--recurse-limit]
59 [--special-syms]
60 [--prefix=prefix]
61 [--prefix-strip=level]
62 [--insn-width=width]
63 [--visualize-jumps[=color|=extended-color|=off]
64 [--disassembler-color=[off|terminal|on|extended]
65 [-U method] [--unicode=method]
66 [-V|--version]
67 [-H|--help]
68 objfile...
69
71 objdump displays information about one or more object files. The
72 options control what particular information to display. This
73 information is mostly useful to programmers who are working on the
74 compilation tools, as opposed to programmers who just want their
75 program to compile and work.
76 objfile... are the object files to be examined. When you specify
78 archives, objdump shows information on each of the member object files.
79
81 The long and short forms of options, shown here as alternatives, are
82 equivalent. At least one option from the list
83 -a,-d,-D,-e,-f,-g,-G,-h,-H,-p,-P,-r,-R,-s,-S,-t,-T,-V,-x must be given.
84 -a
86 --archive-header
87 If any of the objfile files are archives, display the archive
88 header information (in a format similar to ls -l). Besides the
89 information you could list with ar tv, objdump -a shows the object
90 file format of each archive member.
91 --adjust-vma=offset
93 When dumping information, first add offset to all the section
94 addresses. This is useful if the section addresses do not
95 correspond to the symbol table, which can happen when putting
96 sections at particular addresses when using a format which can not
97 represent section addresses, such as a.out.
98 -b bfdname
100 --target=bfdname
101 Specify that the object-code format for the object files is
102 bfdname. This option may not be necessary; objdump can
103 automatically recognize many formats.
104 For example,
106 objdump -b oasys -m vax -h fu.o
108 displays summary information from the section headers (-h) of fu.o,
110 which is explicitly identified (-m) as a VAX object file in the
111 format produced by Oasys compilers. You can list the formats
112 available with the -i option.
113 -C
115 --demangle[=style]
116 Decode (demangle) low-level symbol names into user-level names.
117 Besides removing any initial underscore prepended by the system,
118 this makes C++ function names readable. Different compilers have
119 different mangling styles. The optional demangling style argument
120 can be used to choose an appropriate demangling style for your
121 compiler.
122 --recurse-limit
124 --no-recurse-limit
125 --recursion-limit
126 --no-recursion-limit
127 Enables or disables a limit on the amount of recursion performed
128 whilst demangling strings. Since the name mangling formats allow
129 for an infinite level of recursion it is possible to create strings
130 whose decoding will exhaust the amount of stack space available on
131 the host machine, triggering a memory fault. The limit tries to
132 prevent this from happening by restricting recursion to 2048 levels
133 of nesting.
134 The default is for this limit to be enabled, but disabling it may
136 be necessary in order to demangle truly complicated names. Note
137 however that if the recursion limit is disabled then stack
138 exhaustion is possible and any bug reports about such an event will
139 be rejected.
140 -g
142 --debugging
143 Display debugging information. This attempts to parse STABS
144 debugging format information stored in the file and print it out
145 using a C like syntax. If no STABS debugging was found this option
146 falls back on the -W option to print any DWARF information in the
147 file.
148 -e
150 --debugging-tags
151 Like -g, but the information is generated in a format compatible
152 with ctags tool.
153 -d
155 --disassemble
156 --disassemble=symbol
157 Display the assembler mnemonics for the machine instructions from
158 the input file. This option only disassembles those sections which
159 are expected to contain instructions. If the optional symbol
160 argument is given, then display the assembler mnemonics starting at
161 symbol. If symbol is a function name then disassembly will stop at
162 the end of the function, otherwise it will stop when the next
163 symbol is encountered. If there are no matches for symbol then
164 nothing will be displayed.
165 Note if the --dwarf=follow-links option is enabled then any symbol
167 tables in linked debug info files will be read in and used when
168 disassembling.
169 -D
171 --disassemble-all
172 Like -d, but disassemble the contents of all sections, not just
173 those expected to contain instructions.
174 This option also has a subtle effect on the disassembly of
176 instructions in code sections. When option -d is in effect objdump
177 will assume that any symbols present in a code section occur on the
178 boundary between instructions and it will refuse to disassemble
179 across such a boundary. When option -D is in effect however this
180 assumption is supressed. This means that it is possible for the
181 output of -d and -D to differ if, for example, data is stored in
182 code sections.
183 If the target is an ARM architecture this switch also has the
185 effect of forcing the disassembler to decode pieces of data found
186 in code sections as if they were instructions.
187 Note if the --dwarf=follow-links option is enabled then any symbol
189 tables in linked debug info files will be read in and used when
190 disassembling.
191 --no-addresses
193 When disassembling, don't print addresses on each line or for
194 symbols and relocation offsets. In combination with
195 --no-show-raw-insn this may be useful for comparing compiler
196 output.
197 --prefix-addresses
199 When disassembling, print the complete address on each line. This
200 is the older disassembly format.
201 -EB
203 -EL
204 --endian={big|little}
205 Specify the endianness of the object files. This only affects
206 disassembly. This can be useful when disassembling a file format
207 which does not describe endianness information, such as S-records.
208 -f
210 --file-headers
211 Display summary information from the overall header of each of the
212 objfile files.
213 -F
215 --file-offsets
216 When disassembling sections, whenever a symbol is displayed, also
217 display the file offset of the region of data that is about to be
218 dumped. If zeroes are being skipped, then when disassembly
219 resumes, tell the user how many zeroes were skipped and the file
220 offset of the location from where the disassembly resumes. When
221 dumping sections, display the file offset of the location from
222 where the dump starts.
223 --file-start-context
225 Specify that when displaying interlisted source code/disassembly
226 (assumes -S) from a file that has not yet been displayed, extend
227 the context to the start of the file.
228 -h
230 --section-headers
231 --headers
232 Display summary information from the section headers of the object
233 file.
234 File segments may be relocated to nonstandard addresses, for
236 example by using the -Ttext, -Tdata, or -Tbss options to ld.
237 However, some object file formats, such as a.out, do not store the
238 starting address of the file segments. In those situations,
239 although ld relocates the sections correctly, using objdump -h to
240 list the file section headers cannot show the correct addresses.
241 Instead, it shows the usual addresses, which are implicit for the
242 target.
243 Note, in some cases it is possible for a section to have both the
245 READONLY and the NOREAD attributes set. In such cases the NOREAD
246 attribute takes precedence, but objdump will report both since the
247 exact setting of the flag bits might be important.
248 -H
250 --help
251 Print a summary of the options to objdump and exit.
252 -i
254 --info
255 Display a list showing all architectures and object formats
256 available for specification with -b or -m.
257 -j name
259 --section=name
260 Display information only for section name.
261 -L
263 --process-links
264 Display the contents of non-debug sections found in separate
265 debuginfo files that are linked to the main file. This option
266 automatically implies the -WK option, and only sections requested
267 by other command line options will be displayed.
268 -l
270 --line-numbers
271 Label the display (using debugging information) with the filename
272 and source line numbers corresponding to the object code or relocs
273 shown. Only useful with -d, -D, or -r.
274 -m machine
276 --architecture=machine
277 Specify the architecture to use when disassembling object files.
278 This can be useful when disassembling object files which do not
279 describe architecture information, such as S-records. You can list
280 the available architectures with the -i option.
281 For most architectures it is possible to supply an architecture
283 name and a machine name, separated by a colon. For example foo:bar
284 would refer to the bar machine type in the foo architecture. This
285 can be helpful if objdump has been configured to support multiple
286 architectures.
287 If the target is an ARM architecture then this switch has an
289 additional effect. It restricts the disassembly to only those
290 instructions supported by the architecture specified by machine.
291 If it is necessary to use this switch because the input file does
292 not contain any architecture information, but it is also desired to
293 disassemble all the instructions use -marm.
294 -M options
296 --disassembler-options=options
297 Pass target specific information to the disassembler. Only
298 supported on some targets. If it is necessary to specify more than
299 one disassembler option then multiple -M options can be used or can
300 be placed together into a comma separated list.
301 For ARC, dsp controls the printing of DSP instructions, spfp
303 selects the printing of FPX single precision FP instructions, dpfp
304 selects the printing of FPX double precision FP instructions,
305 quarkse_em selects the printing of special QuarkSE-EM instructions,
306 fpuda selects the printing of double precision assist instructions,
307 fpus selects the printing of FPU single precision FP instructions,
308 while fpud selects the printing of FPU double precision FP
309 instructions. Additionally, one can choose to have all the
310 immediates printed in hexadecimal using hex. By default, the short
311 immediates are printed using the decimal representation, while the
312 long immediate values are printed as hexadecimal.
313 cpu=... allows one to enforce a particular ISA when disassembling
315 instructions, overriding the -m value or whatever is in the ELF
316 file. This might be useful to select ARC EM or HS ISA, because
317 architecture is same for those and disassembler relies on private
318 ELF header data to decide if code is for EM or HS. This option
319 might be specified multiple times - only the latest value will be
320 used. Valid values are same as for the assembler -mcpu=... option.
321 If the target is an ARM architecture then this switch can be used
323 to select which register name set is used during disassembler.
324 Specifying -M reg-names-std (the default) will select the register
325 names as used in ARM's instruction set documentation, but with
326 register 13 called 'sp', register 14 called 'lr' and register 15
327 called 'pc'. Specifying -M reg-names-apcs will select the name set
328 used by the ARM Procedure Call Standard, whilst specifying -M reg-
329 names-raw will just use r followed by the register number.
330 There are also two variants on the APCS register naming scheme
332 enabled by -M reg-names-atpcs and -M reg-names-special-atpcs which
333 use the ARM/Thumb Procedure Call Standard naming conventions.
334 (Either with the normal register names or the special register
335 names).
336 This option can also be used for ARM architectures to force the
338 disassembler to interpret all instructions as Thumb instructions by
339 using the switch --disassembler-options=force-thumb. This can be
340 useful when attempting to disassemble thumb code produced by other
341 compilers.
342 For AArch64 targets this switch can be used to set whether
344 instructions are disassembled as the most general instruction using
345 the -M no-aliases option or whether instruction notes should be
346 generated as comments in the disasssembly using -M notes.
347 For the x86, some of the options duplicate functions of the -m
349 switch, but allow finer grained control.
350 "x86-64"
352 "i386"
353 "i8086"
354 Select disassembly for the given architecture.
355 "intel"
357 "att"
358 Select between intel syntax mode and AT&T syntax mode.
359 "amd64"
361 "intel64"
362 Select between AMD64 ISA and Intel64 ISA.
363 "intel-mnemonic"
365 "att-mnemonic"
366 Select between intel mnemonic mode and AT&T mnemonic mode.
367 Note: "intel-mnemonic" implies "intel" and "att-mnemonic"
368 implies "att".
369 "addr64"
371 "addr32"
372 "addr16"
373 "data32"
374 "data16"
375 Specify the default address size and operand size. These five
376 options will be overridden if "x86-64", "i386" or "i8086"
377 appear later in the option string.
378 "suffix"
380 When in AT&T mode and also for a limited set of instructions
381 when in Intel mode, instructs the disassembler to print a
382 mnemonic suffix even when the suffix could be inferred by the
383 operands or, for certain instructions, the execution mode's
384 defaults.
385 For PowerPC, the -M argument raw selects disasssembly of hardware
387 insns rather than aliases. For example, you will see "rlwinm"
388 rather than "clrlwi", and "addi" rather than "li". All of the -m
389 arguments for gas that select a CPU are supported. These are: 403,
390 405, 440, 464, 476, 601, 603, 604, 620, 7400, 7410, 7450, 7455,
391 750cl, 821, 850, 860, a2, booke, booke32, cell, com, e200z2,
392 e200z4, e300, e500, e500mc, e500mc64, e500x2, e5500, e6500, efs,
393 power4, power5, power6, power7, power8, power9, power10, ppc,
394 ppc32, ppc64, ppc64bridge, ppcps, pwr, pwr2, pwr4, pwr5, pwr5x,
395 pwr6, pwr7, pwr8, pwr9, pwr10, pwrx, titan, vle, and future. 32
396 and 64 modify the default or a prior CPU selection, disabling and
397 enabling 64-bit insns respectively. In addition, altivec, any,
398 lsp, htm, vsx, spe and spe2 add capabilities to a previous or
399 later CPU selection. any will disassemble any opcode known to
400 binutils, but in cases where an opcode has two different meanings
401 or different arguments, you may not see the disassembly you expect.
402 If you disassemble without giving a CPU selection, a default will
403 be chosen from information gleaned by BFD from the object files
404 headers, but the result again may not be as you expect.
405 For MIPS, this option controls the printing of instruction mnemonic
407 names and register names in disassembled instructions. Multiple
408 selections from the following may be specified as a comma separated
409 string, and invalid options are ignored:
410 "no-aliases"
412 Print the 'raw' instruction mnemonic instead of some pseudo
413 instruction mnemonic. I.e., print 'daddu' or 'or' instead of
414 'move', 'sll' instead of 'nop', etc.
415 "msa"
417 Disassemble MSA instructions.
418 "virt"
420 Disassemble the virtualization ASE instructions.
421 "xpa"
423 Disassemble the eXtended Physical Address (XPA) ASE
424 instructions.
425 "gpr-names=ABI"
427 Print GPR (general-purpose register) names as appropriate for
428 the specified ABI. By default, GPR names are selected
429 according to the ABI of the binary being disassembled.
430 "fpr-names=ABI"
432 Print FPR (floating-point register) names as appropriate for
433 the specified ABI. By default, FPR numbers are printed rather
434 than names.
435 "cp0-names=ARCH"
437 Print CP0 (system control coprocessor; coprocessor 0) register
438 names as appropriate for the CPU or architecture specified by
439 ARCH. By default, CP0 register names are selected according to
440 the architecture and CPU of the binary being disassembled.
441 "hwr-names=ARCH"
443 Print HWR (hardware register, used by the "rdhwr" instruction)
444 names as appropriate for the CPU or architecture specified by
445 ARCH. By default, HWR names are selected according to the
446 architecture and CPU of the binary being disassembled.
447 "reg-names=ABI"
449 Print GPR and FPR names as appropriate for the selected ABI.
450 "reg-names=ARCH"
452 Print CPU-specific register names (CP0 register and HWR names)
453 as appropriate for the selected CPU or architecture.
454 For any of the options listed above, ABI or ARCH may be specified
456 as numeric to have numbers printed rather than names, for the
457 selected types of registers. You can list the available values of
458 ABI and ARCH using the --help option.
459 For VAX, you can specify function entry addresses with -M
461 entry:0xf00ba. You can use this multiple times to properly
462 disassemble VAX binary files that don't contain symbol tables (like
463 ROM dumps). In these cases, the function entry mask would
464 otherwise be decoded as VAX instructions, which would probably lead
465 the rest of the function being wrongly disassembled.
466 -p
468 --private-headers
469 Print information that is specific to the object file format. The
470 exact information printed depends upon the object file format. For
471 some object file formats, no additional information is printed.
472 -P options
474 --private=options
475 Print information that is specific to the object file format. The
476 argument options is a comma separated list that depends on the
477 format (the lists of options is displayed with the help).
478 For XCOFF, the available options are:
480 "header"
482 "aout"
483 "sections"
484 "syms"
485 "relocs"
486 "lineno,"
487 "loader"
488 "except"
489 "typchk"
490 "traceback"
491 "toc"
492 "ldinfo"
493 Not all object formats support this option. In particular the ELF
495 format does not use it.
496 -r
498 --reloc
499 Print the relocation entries of the file. If used with -d or -D,
500 the relocations are printed interspersed with the disassembly.
501 -R
503 --dynamic-reloc
504 Print the dynamic relocation entries of the file. This is only
505 meaningful for dynamic objects, such as certain types of shared
506 libraries. As for -r, if used with -d or -D, the relocations are
507 printed interspersed with the disassembly.
508 -s
510 --full-contents
511 Display the full contents of any sections requested. By default
512 all non-empty sections are displayed.
513 -S
515 --source
516 Display source code intermixed with disassembly, if possible.
517 Implies -d.
518 --show-all-symbols
520 When disassembling, show all the symbols that match a given
521 address, not just the first one.
522 --source-comment[=txt]
524 Like the -S option, but all source code lines are displayed with a
525 prefix of txt. Typically txt will be a comment string which can be
526 used to distinguish the assembler code from the source code. If
527 txt is not provided then a default string of "# " (hash followed by
528 a space), will be used.
529 --prefix=prefix
531 Specify prefix to add to the absolute paths when used with -S.
532 --prefix-strip=level
534 Indicate how many initial directory names to strip off the
535 hardwired absolute paths. It has no effect without --prefix=prefix.
536 --show-raw-insn
538 When disassembling instructions, print the instruction in hex as
539 well as in symbolic form. This is the default except when
540 --prefix-addresses is used.
541 --no-show-raw-insn
543 When disassembling instructions, do not print the instruction
544 bytes. This is the default when --prefix-addresses is used.
545 --insn-width=width
547 Display width bytes on a single line when disassembling
548 instructions.
549 --visualize-jumps[=color|=extended-color|=off]
551 Visualize jumps that stay inside a function by drawing ASCII art
552 between the start and target addresses. The optional =color
553 argument adds color to the output using simple terminal colors.
554 Alternatively the =extended-color argument will add color using
555 8bit colors, but these might not work on all terminals.
556 If it is necessary to disable the visualize-jumps option after it
558 has previously been enabled then use visualize-jumps=off.
559 --disassembler-color=off
561 --disassembler-color=terminal
562 --disassembler-color=on|color|colour
563 --disassembler-color=extened|extended-color|extened-colour
564 Enables or disables the use of colored syntax highlighting in
565 disassembly output. The default behaviour is determined via a
566 configure time option. Note, not all architectures support colored
567 syntax highlighting, and depending upon the terminal used, colored
568 output may not actually be legible.
569 The on argument adds colors using simple terminal colors.
571 The terminal argument does the same, but only if the output device
573 is a terminal.
574 The extended-color argument is similar to the on argument, but it
576 uses 8-bit colors. These may not work on all terminals.
577 The off argument disables colored disassembly.
579 -W[lLiaprmfFsoORtUuTgAckK]
581 --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]
582 Displays the contents of the DWARF debug sections in the file, if
583 any are present. Compressed debug sections are automatically
584 decompressed (temporarily) before they are displayed. If one or
585 more of the optional letters or words follows the switch then only
586 those type(s) of data will be dumped. The letters and words refer
587 to the following information:
588 "a"
590 "=abbrev"
591 Displays the contents of the .debug_abbrev section.
592 "A"
594 "=addr"
595 Displays the contents of the .debug_addr section.
596 "c"
598 "=cu_index"
599 Displays the contents of the .debug_cu_index and/or
600 .debug_tu_index sections.
601 "f"
603 "=frames"
604 Display the raw contents of a .debug_frame section.
605 "F"
607 "=frames-interp"
608 Display the interpreted contents of a .debug_frame section.
609 "g"
611 "=gdb_index"
612 Displays the contents of the .gdb_index and/or .debug_names
613 sections.
614 "i"
616 "=info"
617 Displays the contents of the .debug_info section. Note: the
618 output from this option can also be restricted by the use of
619 the --dwarf-depth and --dwarf-start options.
620 "k"
622 "=links"
623 Displays the contents of the .gnu_debuglink, .gnu_debugaltlink
624 and .debug_sup sections, if any of them are present. Also
625 displays any links to separate dwarf object files (dwo), if
626 they are specified by the DW_AT_GNU_dwo_name or DW_AT_dwo_name
627 attributes in the .debug_info section.
628 "K"
630 "=follow-links"
631 Display the contents of any selected debug sections that are
632 found in linked, separate debug info file(s). This can result
633 in multiple versions of the same debug section being displayed
634 if it exists in more than one file.
635 In addition, when displaying DWARF attributes, if a form is
637 found that references the separate debug info file, then the
638 referenced contents will also be displayed.
639 Note - in some distributions this option is enabled by default.
641 It can be disabled via the N debug option. The default can be
642 chosen when configuring the binutils via the
643 --enable-follow-debug-links=yes or
644 --enable-follow-debug-links=no options. If these are not used
645 then the default is to enable the following of debug links.
646 Note - if support for the debuginfod protocol was enabled when
648 the binutils were built then this option will also include an
649 attempt to contact any debuginfod servers mentioned in the
650 DEBUGINFOD_URLS environment variable. This could take some
651 time to resolve. This behaviour can be disabled via the
652 =do-not-use-debuginfod debug option.
653 "N"
655 "=no-follow-links"
656 Disables the following of links to separate debug info files.
657 "D"
659 "=use-debuginfod"
660 Enables contacting debuginfod servers if there is a need to
661 follow debug links. This is the default behaviour.
662 "E"
664 "=do-not-use-debuginfod"
665 Disables contacting debuginfod servers when there is a need to
666 follow debug links.
667 "l"
669 "=rawline"
670 Displays the contents of the .debug_line section in a raw
671 format.
672 "L"
674 "=decodedline"
675 Displays the interpreted contents of the .debug_line section.
676 "m"
678 "=macro"
679 Displays the contents of the .debug_macro and/or .debug_macinfo
680 sections.
681 "o"
683 "=loc"
684 Displays the contents of the .debug_loc and/or .debug_loclists
685 sections.
686 "O"
688 "=str-offsets"
689 Displays the contents of the .debug_str_offsets section.
690 "p"
692 "=pubnames"
693 Displays the contents of the .debug_pubnames and/or
694 .debug_gnu_pubnames sections.
695 "r"
697 "=aranges"
698 Displays the contents of the .debug_aranges section.
699 "R"
701 "=Ranges"
702 Displays the contents of the .debug_ranges and/or
703 .debug_rnglists sections.
704 "s"
706 "=str"
707 Displays the contents of the .debug_str, .debug_line_str and/or
708 .debug_str_offsets sections.
709 "t"
711 "=pubtype"
712 Displays the contents of the .debug_pubtypes and/or
713 .debug_gnu_pubtypes sections.
714 "T"
716 "=trace_aranges"
717 Displays the contents of the .trace_aranges section.
718 "u"
720 "=trace_abbrev"
721 Displays the contents of the .trace_abbrev section.
722 "U"
724 "=trace_info"
725 Displays the contents of the .trace_info section.
726 Note: displaying the contents of .debug_static_funcs,
728 .debug_static_vars and debug_weaknames sections is not currently
729 supported.
730 --dwarf-depth=n
732 Limit the dump of the ".debug_info" section to n children. This is
733 only useful with --debug-dump=info. The default is to print all
734 DIEs; the special value 0 for n will also have this effect.
735 With a non-zero value for n, DIEs at or deeper than n levels will
737 not be printed. The range for n is zero-based.
738 --dwarf-start=n
740 Print only DIEs beginning with the DIE numbered n. This is only
741 useful with --debug-dump=info.
742 If specified, this option will suppress printing of any header
744 information and all DIEs before the DIE numbered n. Only siblings
745 and children of the specified DIE will be printed.
746 This can be used in conjunction with --dwarf-depth.
748 --dwarf-check
750 Enable additional checks for consistency of Dwarf information.
751 --ctf[=section]
753 Display the contents of the specified CTF section. CTF sections
754 themselves contain many subsections, all of which are displayed in
755 order.
756 By default, display the name of the section named .ctf, which is
758 the name emitted by ld.
759 --ctf-parent=member
761 If the CTF section contains ambiguously-defined types, it will
762 consist of an archive of many CTF dictionaries, all inheriting from
763 one dictionary containing unambiguous types. This member is by
764 default named .ctf, like the section containing it, but it is
765 possible to change this name using the
766 "ctf_link_set_memb_name_changer" function at link time. When
767 looking at CTF archives that have been created by a linker that
768 uses the name changer to rename the parent archive member,
769 --ctf-parent can be used to specify the name used for the parent.
770 --sframe[=section]
772 Display the contents of the specified SFrame section.
773 By default, display the name of the section named .sframe, which is
775 the name emitted by ld.
776 -G
778 --stabs
779 Display the full contents of any sections requested. Display the
780 contents of the .stab and .stab.index and .stab.excl sections from
781 an ELF file. This is only useful on systems (such as Solaris 2.0)
782 in which ".stab" debugging symbol-table entries are carried in an
783 ELF section. In most other file formats, debugging symbol-table
784 entries are interleaved with linkage symbols, and are visible in
785 the --syms output.
786 --start-address=address
788 Start displaying data at the specified address. This affects the
789 output of the -d, -r and -s options.
790 --stop-address=address
792 Stop displaying data at the specified address. This affects the
793 output of the -d, -r and -s options.
794 -t
796 --syms
797 Print the symbol table entries of the file. This is similar to the
798 information provided by the nm program, although the display format
799 is different. The format of the output depends upon the format of
800 the file being dumped, but there are two main types. One looks
801 like this:
802 [ 4](sec 3)(fl 0x00)(ty 0)(scl 3) (nx 1) 0x00000000 .bss
804 [ 6](sec 1)(fl 0x00)(ty 0)(scl 2) (nx 0) 0x00000000 fred
805 where the number inside the square brackets is the number of the
807 entry in the symbol table, the sec number is the section number,
808 the fl value are the symbol's flag bits, the ty number is the
809 symbol's type, the scl number is the symbol's storage class and the
810 nx value is the number of auxiliary entries associated with the
811 symbol. The last two fields are the symbol's value and its name.
812 The other common output format, usually seen with ELF based files,
814 looks like this:
815 00000000 l d .bss 00000000 .bss
817 00000000 g .text 00000000 fred
818 Here the first number is the symbol's value (sometimes referred to
820 as its address). The next field is actually a set of characters
821 and spaces indicating the flag bits that are set on the symbol.
822 These characters are described below. Next is the section with
823 which the symbol is associated or *ABS* if the section is absolute
824 (ie not connected with any section), or *UND* if the section is
825 referenced in the file being dumped, but not defined there.
826 After the section name comes another field, a number, which for
828 common symbols is the alignment and for other symbol is the size.
829 Finally the symbol's name is displayed.
830 The flag characters are divided into 7 groups as follows:
832 "l"
834 "g"
835 "u"
836 "!" The symbol is a local (l), global (g), unique global (u),
837 neither global nor local (a space) or both global and local
838 (!). A symbol can be neither local or global for a variety of
839 reasons, e.g., because it is used for debugging, but it is
840 probably an indication of a bug if it is ever both local and
841 global. Unique global symbols are a GNU extension to the
842 standard set of ELF symbol bindings. For such a symbol the
843 dynamic linker will make sure that in the entire process there
844 is just one symbol with this name and type in use.
845 "w" The symbol is weak (w) or strong (a space).
847 "C" The symbol denotes a constructor (C) or an ordinary symbol (a
849 space).
850 "W" The symbol is a warning (W) or a normal symbol (a space). A
852 warning symbol's name is a message to be displayed if the
853 symbol following the warning symbol is ever referenced.
854 "I"
856 "i" The symbol is an indirect reference to another symbol (I), a
857 function to be evaluated during reloc processing (i) or a
858 normal symbol (a space).
859 "d"
861 "D" The symbol is a debugging symbol (d) or a dynamic symbol (D) or
862 a normal symbol (a space).
863 "F"
865 "f"
866 "O" The symbol is the name of a function (F) or a file (f) or an
867 object (O) or just a normal symbol (a space).
868 -T
870 --dynamic-syms
871 Print the dynamic symbol table entries of the file. This is only
872 meaningful for dynamic objects, such as certain types of shared
873 libraries. This is similar to the information provided by the nm
874 program when given the -D (--dynamic) option.
875 The output format is similar to that produced by the --syms option,
877 except that an extra field is inserted before the symbol's name,
878 giving the version information associated with the symbol. If the
879 version is the default version to be used when resolving
880 unversioned references to the symbol then it's displayed as is,
881 otherwise it's put into parentheses.
882 --special-syms
884 When displaying symbols include those which the target considers to
885 be special in some way and which would not normally be of interest
886 to the user.
887 -U [d|i|l|e|x|h]
889 --unicode=[default|invalid|locale|escape|hex|highlight]
890 Controls the display of UTF-8 encoded multibyte characters in
891 strings. The default (--unicode=default) is to give them no
892 special treatment. The --unicode=locale option displays the
893 sequence in the current locale, which may or may not support them.
894 The options --unicode=hex and --unicode=invalid display them as hex
895 byte sequences enclosed by either angle brackets or curly braces.
896 The --unicode=escape option displays them as escape sequences
898 (\uxxxx) and the --unicode=highlight option displays them as escape
899 sequences highlighted in red (if supported by the output device).
900 The colouring is intended to draw attention to the presence of
901 unicode sequences where they might not be expected.
902 -V
904 --version
905 Print the version number of objdump and exit.
906 -x
908 --all-headers
909 Display all available header information, including the symbol
910 table and relocation entries. Using -x is equivalent to specifying
911 all of -a -f -h -p -r -t.
912 -w
914 --wide
915 Format some lines for output devices that have more than 80
916 columns. Also do not truncate symbol names when they are
917 displayed.
918 -z
920 --disassemble-zeroes
921 Normally the disassembly output will skip blocks of zeroes. This
922 option directs the disassembler to disassemble those blocks, just
923 like any other data.
924 @file
926 Read command-line options from file. The options read are inserted
927 in place of the original @file option. If file does not exist, or
928 cannot be read, then the option will be treated literally, and not
929 removed.
930 Options in file are separated by whitespace. A whitespace
932 character may be included in an option by surrounding the entire
933 option in either single or double quotes. Any character (including
934 a backslash) may be included by prefixing the character to be
935 included with a backslash. The file may itself contain additional
936 @file options; any such options will be processed recursively.
937
939 nm(1), readelf(1), and the Info entries for binutils.
940
942 Copyright (c) 1991-2023 Free Software Foundation, Inc.
943 Permission is granted to copy, distribute and/or modify this document
945 under the terms of the GNU Free Documentation License, Version 1.3 or
946 any later version published by the Free Software Foundation; with no
947 Invariant Sections, with no Front-Cover Texts, and with no Back-Cover
948 Texts. A copy of the license is included in the section entitled "GNU
949 Free Documentation License".
950binutils-2.40.00 2023-07-19 OBJDUMP(1)