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 [-G|--stabs]
43 [-t|--syms]
44 [-T|--dynamic-syms]
45 [-x|--all-headers]
46 [-w|--wide]
47 [--start-address=address]
48 [--stop-address=address]
49 [--no-addresses]
50 [--prefix-addresses]
51 [--[no-]show-raw-insn]
52 [--adjust-vma=offset]
53 [--dwarf-depth=n]
54 [--dwarf-start=n]
55 [--ctf-parent=section]
56 [--no-recurse-limit|--recurse-limit]
57 [--special-syms]
58 [--prefix=prefix]
59 [--prefix-strip=level]
60 [--insn-width=width]
61 [--visualize-jumps[=color|=extended-color|=off]
62 [-U method] [--unicode=method]
63 [-V|--version]
64 [-H|--help]
65 objfile...
66
68 objdump displays information about one or more object files. The
69 options control what particular information to display. This
70 information is mostly useful to programmers who are working on the
71 compilation tools, as opposed to programmers who just want their
72 program to compile and work.
73 objfile... are the object files to be examined. When you specify
75 archives, objdump shows information on each of the member object files.
76
78 The long and short forms of options, shown here as alternatives, are
79 equivalent. At least one option from the list
80 -a,-d,-D,-e,-f,-g,-G,-h,-H,-p,-P,-r,-R,-s,-S,-t,-T,-V,-x must be given.
81 -a
83 --archive-header
84 If any of the objfile files are archives, display the archive
85 header information (in a format similar to ls -l). Besides the
86 information you could list with ar tv, objdump -a shows the object
87 file format of each archive member.
88 --adjust-vma=offset
90 When dumping information, first add offset to all the section
91 addresses. This is useful if the section addresses do not
92 correspond to the symbol table, which can happen when putting
93 sections at particular addresses when using a format which can not
94 represent section addresses, such as a.out.
95 -b bfdname
97 --target=bfdname
98 Specify that the object-code format for the object files is
99 bfdname. This option may not be necessary; objdump can
100 automatically recognize many formats.
101 For example,
103 objdump -b oasys -m vax -h fu.o
105 displays summary information from the section headers (-h) of fu.o,
107 which is explicitly identified (-m) as a VAX object file in the
108 format produced by Oasys compilers. You can list the formats
109 available with the -i option.
110 -C
112 --demangle[=style]
113 Decode (demangle) low-level symbol names into user-level names.
114 Besides removing any initial underscore prepended by the system,
115 this makes C++ function names readable. Different compilers have
116 different mangling styles. The optional demangling style argument
117 can be used to choose an appropriate demangling style for your
118 compiler.
119 --recurse-limit
121 --no-recurse-limit
122 --recursion-limit
123 --no-recursion-limit
124 Enables or disables a limit on the amount of recursion performed
125 whilst demangling strings. Since the name mangling formats allow
126 for an infinite level of recursion it is possible to create strings
127 whose decoding will exhaust the amount of stack space available on
128 the host machine, triggering a memory fault. The limit tries to
129 prevent this from happening by restricting recursion to 2048 levels
130 of nesting.
131 The default is for this limit to be enabled, but disabling it may
133 be necessary in order to demangle truly complicated names. Note
134 however that if the recursion limit is disabled then stack
135 exhaustion is possible and any bug reports about such an event will
136 be rejected.
137 -g
139 --debugging
140 Display debugging information. This attempts to parse STABS
141 debugging format information stored in the file and print it out
142 using a C like syntax. If no STABS debugging was found this option
143 falls back on the -W option to print any DWARF information in the
144 file.
145 -e
147 --debugging-tags
148 Like -g, but the information is generated in a format compatible
149 with ctags tool.
150 -d
152 --disassemble
153 --disassemble=symbol
154 Display the assembler mnemonics for the machine instructions from
155 the input file. This option only disassembles those sections which
156 are expected to contain instructions. If the optional symbol
157 argument is given, then display the assembler mnemonics starting at
158 symbol. If symbol is a function name then disassembly will stop at
159 the end of the function, otherwise it will stop when the next
160 symbol is encountered. If there are no matches for symbol then
161 nothing will be displayed.
162 Note if the --dwarf=follow-links option is enabled then any symbol
164 tables in linked debug info files will be read in and used when
165 disassembling.
166 -D
168 --disassemble-all
169 Like -d, but disassemble the contents of all sections, not just
170 those expected to contain instructions.
171 This option also has a subtle effect on the disassembly of
173 instructions in code sections. When option -d is in effect objdump
174 will assume that any symbols present in a code section occur on the
175 boundary between instructions and it will refuse to disassemble
176 across such a boundary. When option -D is in effect however this
177 assumption is supressed. This means that it is possible for the
178 output of -d and -D to differ if, for example, data is stored in
179 code sections.
180 If the target is an ARM architecture this switch also has the
182 effect of forcing the disassembler to decode pieces of data found
183 in code sections as if they were instructions.
184 Note if the --dwarf=follow-links option is enabled then any symbol
186 tables in linked debug info files will be read in and used when
187 disassembling.
188 --no-addresses
190 When disassembling, don't print addresses on each line or for
191 symbols and relocation offsets. In combination with
192 --no-show-raw-insn this may be useful for comparing compiler
193 output.
194 --prefix-addresses
196 When disassembling, print the complete address on each line. This
197 is the older disassembly format.
198 -EB
200 -EL
201 --endian={big|little}
202 Specify the endianness of the object files. This only affects
203 disassembly. This can be useful when disassembling a file format
204 which does not describe endianness information, such as S-records.
205 -f
207 --file-headers
208 Display summary information from the overall header of each of the
209 objfile files.
210 -F
212 --file-offsets
213 When disassembling sections, whenever a symbol is displayed, also
214 display the file offset of the region of data that is about to be
215 dumped. If zeroes are being skipped, then when disassembly
216 resumes, tell the user how many zeroes were skipped and the file
217 offset of the location from where the disassembly resumes. When
218 dumping sections, display the file offset of the location from
219 where the dump starts.
220 --file-start-context
222 Specify that when displaying interlisted source code/disassembly
223 (assumes -S) from a file that has not yet been displayed, extend
224 the context to the start of the file.
225 -h
227 --section-headers
228 --headers
229 Display summary information from the section headers of the object
230 file.
231 File segments may be relocated to nonstandard addresses, for
233 example by using the -Ttext, -Tdata, or -Tbss options to ld.
234 However, some object file formats, such as a.out, do not store the
235 starting address of the file segments. In those situations,
236 although ld relocates the sections correctly, using objdump -h to
237 list the file section headers cannot show the correct addresses.
238 Instead, it shows the usual addresses, which are implicit for the
239 target.
240 Note, in some cases it is possible for a section to have both the
242 READONLY and the NOREAD attributes set. In such cases the NOREAD
243 attribute takes precedence, but objdump will report both since the
244 exact setting of the flag bits might be important.
245 -H
247 --help
248 Print a summary of the options to objdump and exit.
249 -i
251 --info
252 Display a list showing all architectures and object formats
253 available for specification with -b or -m.
254 -j name
256 --section=name
257 Display information only for section name.
258 -L
260 --process-links
261 Display the contents of non-debug sections found in separate
262 debuginfo files that are linked to the main file. This option
263 automatically implies the -WK option, and only sections requested
264 by other command line options will be displayed.
265 -l
267 --line-numbers
268 Label the display (using debugging information) with the filename
269 and source line numbers corresponding to the object code or relocs
270 shown. Only useful with -d, -D, or -r.
271 -m machine
273 --architecture=machine
274 Specify the architecture to use when disassembling object files.
275 This can be useful when disassembling object files which do not
276 describe architecture information, such as S-records. You can list
277 the available architectures with the -i option.
278 If the target is an ARM architecture then this switch has an
280 additional effect. It restricts the disassembly to only those
281 instructions supported by the architecture specified by machine.
282 If it is necessary to use this switch because the input file does
283 not contain any architecture information, but it is also desired to
284 disassemble all the instructions use -marm.
285 -M options
287 --disassembler-options=options
288 Pass target specific information to the disassembler. Only
289 supported on some targets. If it is necessary to specify more than
290 one disassembler option then multiple -M options can be used or can
291 be placed together into a comma separated list.
292 For ARC, dsp controls the printing of DSP instructions, spfp
294 selects the printing of FPX single precision FP instructions, dpfp
295 selects the printing of FPX double precision FP instructions,
296 quarkse_em selects the printing of special QuarkSE-EM instructions,
297 fpuda selects the printing of double precision assist instructions,
298 fpus selects the printing of FPU single precision FP instructions,
299 while fpud selects the printing of FPU double precision FP
300 instructions. Additionally, one can choose to have all the
301 immediates printed in hexadecimal using hex. By default, the short
302 immediates are printed using the decimal representation, while the
303 long immediate values are printed as hexadecimal.
304 cpu=... allows one to enforce a particular ISA when disassembling
306 instructions, overriding the -m value or whatever is in the ELF
307 file. This might be useful to select ARC EM or HS ISA, because
308 architecture is same for those and disassembler relies on private
309 ELF header data to decide if code is for EM or HS. This option
310 might be specified multiple times - only the latest value will be
311 used. Valid values are same as for the assembler -mcpu=... option.
312 If the target is an ARM architecture then this switch can be used
314 to select which register name set is used during disassembler.
315 Specifying -M reg-names-std (the default) will select the register
316 names as used in ARM's instruction set documentation, but with
317 register 13 called 'sp', register 14 called 'lr' and register 15
318 called 'pc'. Specifying -M reg-names-apcs will select the name set
319 used by the ARM Procedure Call Standard, whilst specifying -M reg-
320 names-raw will just use r followed by the register number.
321 There are also two variants on the APCS register naming scheme
323 enabled by -M reg-names-atpcs and -M reg-names-special-atpcs which
324 use the ARM/Thumb Procedure Call Standard naming conventions.
325 (Either with the normal register names or the special register
326 names).
327 This option can also be used for ARM architectures to force the
329 disassembler to interpret all instructions as Thumb instructions by
330 using the switch --disassembler-options=force-thumb. This can be
331 useful when attempting to disassemble thumb code produced by other
332 compilers.
333 For AArch64 targets this switch can be used to set whether
335 instructions are disassembled as the most general instruction using
336 the -M no-aliases option or whether instruction notes should be
337 generated as comments in the disasssembly using -M notes.
338 For the x86, some of the options duplicate functions of the -m
340 switch, but allow finer grained control.
341 "x86-64"
343 "i386"
344 "i8086"
345 Select disassembly for the given architecture.
346 "intel"
348 "att"
349 Select between intel syntax mode and AT&T syntax mode.
350 "amd64"
352 "intel64"
353 Select between AMD64 ISA and Intel64 ISA.
354 "intel-mnemonic"
356 "att-mnemonic"
357 Select between intel mnemonic mode and AT&T mnemonic mode.
358 Note: "intel-mnemonic" implies "intel" and "att-mnemonic"
359 implies "att".
360 "addr64"
362 "addr32"
363 "addr16"
364 "data32"
365 "data16"
366 Specify the default address size and operand size. These five
367 options will be overridden if "x86-64", "i386" or "i8086"
368 appear later in the option string.
369 "suffix"
371 When in AT&T mode and also for a limited set of instructions
372 when in Intel mode, instructs the disassembler to print a
373 mnemonic suffix even when the suffix could be inferred by the
374 operands or, for certain instructions, the execution mode's
375 defaults.
376 For PowerPC, the -M argument raw selects disasssembly of hardware
378 insns rather than aliases. For example, you will see "rlwinm"
379 rather than "clrlwi", and "addi" rather than "li". All of the -m
380 arguments for gas that select a CPU are supported. These are: 403,
381 405, 440, 464, 476, 601, 603, 604, 620, 7400, 7410, 7450, 7455,
382 750cl, 821, 850, 860, a2, booke, booke32, cell, com, e200z4, e300,
383 e500, e500mc, e500mc64, e500x2, e5500, e6500, efs, power4, power5,
384 power6, power7, power8, power9, power10, ppc, ppc32, ppc64,
385 ppc64bridge, ppcps, pwr, pwr2, pwr4, pwr5, pwr5x, pwr6, pwr7, pwr8,
386 pwr9, pwr10, pwrx, titan, and vle. 32 and 64 modify the default or
387 a prior CPU selection, disabling and enabling 64-bit insns
388 respectively. In addition, altivec, any, htm, vsx, and spe add
389 capabilities to a previous or later CPU selection. any will
390 disassemble any opcode known to binutils, but in cases where an
391 opcode has two different meanings or different arguments, you may
392 not see the disassembly you expect. If you disassemble without
393 giving a CPU selection, a default will be chosen from information
394 gleaned by BFD from the object files headers, but the result again
395 may not be as you expect.
396 For MIPS, this option controls the printing of instruction mnemonic
398 names and register names in disassembled instructions. Multiple
399 selections from the following may be specified as a comma separated
400 string, and invalid options are ignored:
401 "no-aliases"
403 Print the 'raw' instruction mnemonic instead of some pseudo
404 instruction mnemonic. I.e., print 'daddu' or 'or' instead of
405 'move', 'sll' instead of 'nop', etc.
406 "msa"
408 Disassemble MSA instructions.
409 "virt"
411 Disassemble the virtualization ASE instructions.
412 "xpa"
414 Disassemble the eXtended Physical Address (XPA) ASE
415 instructions.
416 "gpr-names=ABI"
418 Print GPR (general-purpose register) names as appropriate for
419 the specified ABI. By default, GPR names are selected
420 according to the ABI of the binary being disassembled.
421 "fpr-names=ABI"
423 Print FPR (floating-point register) names as appropriate for
424 the specified ABI. By default, FPR numbers are printed rather
425 than names.
426 "cp0-names=ARCH"
428 Print CP0 (system control coprocessor; coprocessor 0) register
429 names as appropriate for the CPU or architecture specified by
430 ARCH. By default, CP0 register names are selected according to
431 the architecture and CPU of the binary being disassembled.
432 "hwr-names=ARCH"
434 Print HWR (hardware register, used by the "rdhwr" instruction)
435 names as appropriate for the CPU or architecture specified by
436 ARCH. By default, HWR names are selected according to the
437 architecture and CPU of the binary being disassembled.
438 "reg-names=ABI"
440 Print GPR and FPR names as appropriate for the selected ABI.
441 "reg-names=ARCH"
443 Print CPU-specific register names (CP0 register and HWR names)
444 as appropriate for the selected CPU or architecture.
445 For any of the options listed above, ABI or ARCH may be specified
447 as numeric to have numbers printed rather than names, for the
448 selected types of registers. You can list the available values of
449 ABI and ARCH using the --help option.
450 For VAX, you can specify function entry addresses with -M
452 entry:0xf00ba. You can use this multiple times to properly
453 disassemble VAX binary files that don't contain symbol tables (like
454 ROM dumps). In these cases, the function entry mask would
455 otherwise be decoded as VAX instructions, which would probably lead
456 the rest of the function being wrongly disassembled.
457 -p
459 --private-headers
460 Print information that is specific to the object file format. The
461 exact information printed depends upon the object file format. For
462 some object file formats, no additional information is printed.
463 -P options
465 --private=options
466 Print information that is specific to the object file format. The
467 argument options is a comma separated list that depends on the
468 format (the lists of options is displayed with the help).
469 For XCOFF, the available options are:
471 "header"
473 "aout"
474 "sections"
475 "syms"
476 "relocs"
477 "lineno,"
478 "loader"
479 "except"
480 "typchk"
481 "traceback"
482 "toc"
483 "ldinfo"
484 Not all object formats support this option. In particular the ELF
486 format does not use it.
487 -r
489 --reloc
490 Print the relocation entries of the file. If used with -d or -D,
491 the relocations are printed interspersed with the disassembly.
492 -R
494 --dynamic-reloc
495 Print the dynamic relocation entries of the file. This is only
496 meaningful for dynamic objects, such as certain types of shared
497 libraries. As for -r, if used with -d or -D, the relocations are
498 printed interspersed with the disassembly.
499 -s
501 --full-contents
502 Display the full contents of any sections requested. By default
503 all non-empty sections are displayed.
504 -S
506 --source
507 Display source code intermixed with disassembly, if possible.
508 Implies -d.
509 --source-comment[=txt]
511 Like the -S option, but all source code lines are displayed with a
512 prefix of txt. Typically txt will be a comment string which can be
513 used to distinguish the assembler code from the source code. If
514 txt is not provided then a default string of "# " (hash followed by
515 a space), will be used.
516 --prefix=prefix
518 Specify prefix to add to the absolute paths when used with -S.
519 --prefix-strip=level
521 Indicate how many initial directory names to strip off the
522 hardwired absolute paths. It has no effect without --prefix=prefix.
523 --show-raw-insn
525 When disassembling instructions, print the instruction in hex as
526 well as in symbolic form. This is the default except when
527 --prefix-addresses is used.
528 --no-show-raw-insn
530 When disassembling instructions, do not print the instruction
531 bytes. This is the default when --prefix-addresses is used.
532 --insn-width=width
534 Display width bytes on a single line when disassembling
535 instructions.
536 --visualize-jumps[=color|=extended-color|=off]
538 Visualize jumps that stay inside a function by drawing ASCII art
539 between the start and target addresses. The optional =color
540 argument adds color to the output using simple terminal colors.
541 Alternatively the =extended-color argument will add color using
542 8bit colors, but these might not work on all terminals.
543 If it is necessary to disable the visualize-jumps option after it
545 has previously been enabled then use visualize-jumps=off.
546 -W[lLiaprmfFsoORtUuTgAckK]
548 --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]
549 Displays the contents of the DWARF debug sections in the file, if
550 any are present. Compressed debug sections are automatically
551 decompressed (temporarily) before they are displayed. If one or
552 more of the optional letters or words follows the switch then only
553 those type(s) of data will be dumped. The letters and words refer
554 to the following information:
555 "a"
557 "=abbrev"
558 Displays the contents of the .debug_abbrev section.
559 "A"
561 "=addr"
562 Displays the contents of the .debug_addr section.
563 "c"
565 "=cu_index"
566 Displays the contents of the .debug_cu_index and/or
567 .debug_tu_index sections.
568 "f"
570 "=frames"
571 Display the raw contents of a .debug_frame section.
572 "F"
574 "=frames-interp"
575 Display the interpreted contents of a .debug_frame section.
576 "g"
578 "=gdb_index"
579 Displays the contents of the .gdb_index and/or .debug_names
580 sections.
581 "i"
583 "=info"
584 Displays the contents of the .debug_info section. Note: the
585 output from this option can also be restricted by the use of
586 the --dwarf-depth and --dwarf-start options.
587 "k"
589 "=links"
590 Displays the contents of the .gnu_debuglink, .gnu_debugaltlink
591 and .debug_sup sections, if any of them are present. Also
592 displays any links to separate dwarf object files (dwo), if
593 they are specified by the DW_AT_GNU_dwo_name or DW_AT_dwo_name
594 attributes in the .debug_info section.
595 "K"
597 "=follow-links"
598 Display the contents of any selected debug sections that are
599 found in linked, separate debug info file(s). This can result
600 in multiple versions of the same debug section being displayed
601 if it exists in more than one file.
602 In addition, when displaying DWARF attributes, if a form is
604 found that references the separate debug info file, then the
605 referenced contents will also be displayed.
606 Note - in some distributions this option is enabled by default.
608 It can be disabled via the N debug option. The default can be
609 chosen when configuring the binutils via the
610 --enable-follow-debug-links=yes or
611 --enable-follow-debug-links=no options. If these are not used
612 then the default is to enable the following of debug links.
613 Note - if support for the debuginfod protocol was enabled when
615 the binutils were built then this option will also include an
616 attempt to contact any debuginfod servers mentioned in the
617 DEBUGINFOD_URLS environment variable. This could take some
618 time to resolve. This behaviour can be disabled via the
619 =do-not-use-debuginfod debug option.
620 "N"
622 "=no-follow-links"
623 Disables the following of links to separate debug info files.
624 "D"
626 "=use-debuginfod"
627 Enables contacting debuginfod servers if there is a need to
628 follow debug links. This is the default behaviour.
629 "E"
631 "=do-not-use-debuginfod"
632 Disables contacting debuginfod servers when there is a need to
633 follow debug links.
634 "l"
636 "=rawline"
637 Displays the contents of the .debug_line section in a raw
638 format.
639 "L"
641 "=decodedline"
642 Displays the interpreted contents of the .debug_line section.
643 "m"
645 "=macro"
646 Displays the contents of the .debug_macro and/or .debug_macinfo
647 sections.
648 "o"
650 "=loc"
651 Displays the contents of the .debug_loc and/or .debug_loclists
652 sections.
653 "O"
655 "=str-offsets"
656 Displays the contents of the .debug_str_offsets section.
657 "p"
659 "=pubnames"
660 Displays the contents of the .debug_pubnames and/or
661 .debug_gnu_pubnames sections.
662 "r"
664 "=aranges"
665 Displays the contents of the .debug_aranges section.
666 "R"
668 "=Ranges"
669 Displays the contents of the .debug_ranges and/or
670 .debug_rnglists sections.
671 "s"
673 "=str"
674 Displays the contents of the .debug_str, .debug_line_str and/or
675 .debug_str_offsets sections.
676 "t"
678 "=pubtype"
679 Displays the contents of the .debug_pubtypes and/or
680 .debug_gnu_pubtypes sections.
681 "T"
683 "=trace_aranges"
684 Displays the contents of the .trace_aranges section.
685 "u"
687 "=trace_abbrev"
688 Displays the contents of the .trace_abbrev section.
689 "U"
691 "=trace_info"
692 Displays the contents of the .trace_info section.
693 Note: displaying the contents of .debug_static_funcs,
695 .debug_static_vars and debug_weaknames sections is not currently
696 supported.
697 --dwarf-depth=n
699 Limit the dump of the ".debug_info" section to n children. This is
700 only useful with --debug-dump=info. The default is to print all
701 DIEs; the special value 0 for n will also have this effect.
702 With a non-zero value for n, DIEs at or deeper than n levels will
704 not be printed. The range for n is zero-based.
705 --dwarf-start=n
707 Print only DIEs beginning with the DIE numbered n. This is only
708 useful with --debug-dump=info.
709 If specified, this option will suppress printing of any header
711 information and all DIEs before the DIE numbered n. Only siblings
712 and children of the specified DIE will be printed.
713 This can be used in conjunction with --dwarf-depth.
715 --dwarf-check
717 Enable additional checks for consistency of Dwarf information.
718 --ctf[=section]
720 Display the contents of the specified CTF section. CTF sections
721 themselves contain many subsections, all of which are displayed in
722 order.
723 By default, display the name of the section named .ctf, which is
725 the name emitted by ld.
726 --ctf-parent=member
728 If the CTF section contains ambiguously-defined types, it will
729 consist of an archive of many CTF dictionaries, all inheriting from
730 one dictionary containing unambiguous types. This member is by
731 default named .ctf, like the section containing it, but it is
732 possible to change this name using the
733 "ctf_link_set_memb_name_changer" function at link time. When
734 looking at CTF archives that have been created by a linker that
735 uses the name changer to rename the parent archive member,
736 --ctf-parent can be used to specify the name used for the parent.
737 -G
739 --stabs
740 Display the full contents of any sections requested. Display the
741 contents of the .stab and .stab.index and .stab.excl sections from
742 an ELF file. This is only useful on systems (such as Solaris 2.0)
743 in which ".stab" debugging symbol-table entries are carried in an
744 ELF section. In most other file formats, debugging symbol-table
745 entries are interleaved with linkage symbols, and are visible in
746 the --syms output.
747 --start-address=address
749 Start displaying data at the specified address. This affects the
750 output of the -d, -r and -s options.
751 --stop-address=address
753 Stop displaying data at the specified address. This affects the
754 output of the -d, -r and -s options.
755 -t
757 --syms
758 Print the symbol table entries of the file. This is similar to the
759 information provided by the nm program, although the display format
760 is different. The format of the output depends upon the format of
761 the file being dumped, but there are two main types. One looks
762 like this:
763 [ 4](sec 3)(fl 0x00)(ty 0)(scl 3) (nx 1) 0x00000000 .bss
765 [ 6](sec 1)(fl 0x00)(ty 0)(scl 2) (nx 0) 0x00000000 fred
766 where the number inside the square brackets is the number of the
768 entry in the symbol table, the sec number is the section number,
769 the fl value are the symbol's flag bits, the ty number is the
770 symbol's type, the scl number is the symbol's storage class and the
771 nx value is the number of auxiliary entries associated with the
772 symbol. The last two fields are the symbol's value and its name.
773 The other common output format, usually seen with ELF based files,
775 looks like this:
776 00000000 l d .bss 00000000 .bss
778 00000000 g .text 00000000 fred
779 Here the first number is the symbol's value (sometimes referred to
781 as its address). The next field is actually a set of characters
782 and spaces indicating the flag bits that are set on the symbol.
783 These characters are described below. Next is the section with
784 which the symbol is associated or *ABS* if the section is absolute
785 (ie not connected with any section), or *UND* if the section is
786 referenced in the file being dumped, but not defined there.
787 After the section name comes another field, a number, which for
789 common symbols is the alignment and for other symbol is the size.
790 Finally the symbol's name is displayed.
791 The flag characters are divided into 7 groups as follows:
793 "l"
795 "g"
796 "u"
797 "!" The symbol is a local (l), global (g), unique global (u),
798 neither global nor local (a space) or both global and local
799 (!). A symbol can be neither local or global for a variety of
800 reasons, e.g., because it is used for debugging, but it is
801 probably an indication of a bug if it is ever both local and
802 global. Unique global symbols are a GNU extension to the
803 standard set of ELF symbol bindings. For such a symbol the
804 dynamic linker will make sure that in the entire process there
805 is just one symbol with this name and type in use.
806 "w" The symbol is weak (w) or strong (a space).
808 "C" The symbol denotes a constructor (C) or an ordinary symbol (a
810 space).
811 "W" The symbol is a warning (W) or a normal symbol (a space). A
813 warning symbol's name is a message to be displayed if the
814 symbol following the warning symbol is ever referenced.
815 "I"
817 "i" The symbol is an indirect reference to another symbol (I), a
818 function to be evaluated during reloc processing (i) or a
819 normal symbol (a space).
820 "d"
822 "D" The symbol is a debugging symbol (d) or a dynamic symbol (D) or
823 a normal symbol (a space).
824 "F"
826 "f"
827 "O" The symbol is the name of a function (F) or a file (f) or an
828 object (O) or just a normal symbol (a space).
829 -T
831 --dynamic-syms
832 Print the dynamic symbol table entries of the file. This is only
833 meaningful for dynamic objects, such as certain types of shared
834 libraries. This is similar to the information provided by the nm
835 program when given the -D (--dynamic) option.
836 The output format is similar to that produced by the --syms option,
838 except that an extra field is inserted before the symbol's name,
839 giving the version information associated with the symbol. If the
840 version is the default version to be used when resolving
841 unversioned references to the symbol then it's displayed as is,
842 otherwise it's put into parentheses.
843 --special-syms
845 When displaying symbols include those which the target considers to
846 be special in some way and which would not normally be of interest
847 to the user.
848 -U [d|i|l|e|x|h]
850 --unicode=[default|invalid|locale|escape|hex|highlight]
851 Controls the display of UTF-8 encoded multibyte characters in
852 strings. The default (--unicode=default) is to give them no
853 special treatment. The --unicode=locale option displays the
854 sequence in the current locale, which may or may not support them.
855 The options --unicode=hex and --unicode=invalid display them as hex
856 byte sequences enclosed by either angle brackets or curly braces.
857 The --unicode=escape option displays them as escape sequences
859 (\uxxxx) and the --unicode=highlight option displays them as escape
860 sequences highlighted in red (if supported by the output device).
861 The colouring is intended to draw attention to the presence of
862 unicode sequences where they might not be expected.
863 -V
865 --version
866 Print the version number of objdump and exit.
867 -x
869 --all-headers
870 Display all available header information, including the symbol
871 table and relocation entries. Using -x is equivalent to specifying
872 all of -a -f -h -p -r -t.
873 -w
875 --wide
876 Format some lines for output devices that have more than 80
877 columns. Also do not truncate symbol names when they are
878 displayed.
879 -z
881 --disassemble-zeroes
882 Normally the disassembly output will skip blocks of zeroes. This
883 option directs the disassembler to disassemble those blocks, just
884 like any other data.
885 @file
887 Read command-line options from file. The options read are inserted
888 in place of the original @file option. If file does not exist, or
889 cannot be read, then the option will be treated literally, and not
890 removed.
891 Options in file are separated by whitespace. A whitespace
893 character may be included in an option by surrounding the entire
894 option in either single or double quotes. Any character (including
895 a backslash) may be included by prefixing the character to be
896 included with a backslash. The file may itself contain additional
897 @file options; any such options will be processed recursively.
898
900 nm(1), readelf(1), and the Info entries for binutils.
901
903 Copyright (c) 1991-2022 Free Software Foundation, Inc.
904 Permission is granted to copy, distribute and/or modify this document
906 under the terms of the GNU Free Documentation License, Version 1.3 or
907 any later version published by the Free Software Foundation; with no
908 Invariant Sections, with no Front-Cover Texts, and with no Back-Cover
909 Texts. A copy of the license is included in the section entitled "GNU
910 Free Documentation License".
911binutils-2.38 2022-11-16 OBJDUMP(1)