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 [--disassembler-color=[color|extended-color|off]
63 [-U method] [--unicode=method]
64 [-V|--version]
65 [-H|--help]
66 objfile...
67
69 objdump displays information about one or more object files. The
70 options control what particular information to display. This
71 information is mostly useful to programmers who are working on the
72 compilation tools, as opposed to programmers who just want their
73 program to compile and work.
74 objfile... are the object files to be examined. When you specify
76 archives, objdump shows information on each of the member object files.
77
79 The long and short forms of options, shown here as alternatives, are
80 equivalent. At least one option from the list
81 -a,-d,-D,-e,-f,-g,-G,-h,-H,-p,-P,-r,-R,-s,-S,-t,-T,-V,-x must be given.
82 -a
84 --archive-header
85 If any of the objfile files are archives, display the archive
86 header information (in a format similar to ls -l). Besides the
87 information you could list with ar tv, objdump -a shows the object
88 file format of each archive member.
89 --adjust-vma=offset
91 When dumping information, first add offset to all the section
92 addresses. This is useful if the section addresses do not
93 correspond to the symbol table, which can happen when putting
94 sections at particular addresses when using a format which can not
95 represent section addresses, such as a.out.
96 -b bfdname
98 --target=bfdname
99 Specify that the object-code format for the object files is
100 bfdname. This option may not be necessary; objdump can
101 automatically recognize many formats.
102 For example,
104 objdump -b oasys -m vax -h fu.o
106 displays summary information from the section headers (-h) of fu.o,
108 which is explicitly identified (-m) as a VAX object file in the
109 format produced by Oasys compilers. You can list the formats
110 available with the -i option.
111 -C
113 --demangle[=style]
114 Decode (demangle) low-level symbol names into user-level names.
115 Besides removing any initial underscore prepended by the system,
116 this makes C++ function names readable. Different compilers have
117 different mangling styles. The optional demangling style argument
118 can be used to choose an appropriate demangling style for your
119 compiler.
120 --recurse-limit
122 --no-recurse-limit
123 --recursion-limit
124 --no-recursion-limit
125 Enables or disables a limit on the amount of recursion performed
126 whilst demangling strings. Since the name mangling formats allow
127 for an infinite level of recursion it is possible to create strings
128 whose decoding will exhaust the amount of stack space available on
129 the host machine, triggering a memory fault. The limit tries to
130 prevent this from happening by restricting recursion to 2048 levels
131 of nesting.
132 The default is for this limit to be enabled, but disabling it may
134 be necessary in order to demangle truly complicated names. Note
135 however that if the recursion limit is disabled then stack
136 exhaustion is possible and any bug reports about such an event will
137 be rejected.
138 -g
140 --debugging
141 Display debugging information. This attempts to parse STABS
142 debugging format information stored in the file and print it out
143 using a C like syntax. If no STABS debugging was found this option
144 falls back on the -W option to print any DWARF information in the
145 file.
146 -e
148 --debugging-tags
149 Like -g, but the information is generated in a format compatible
150 with ctags tool.
151 -d
153 --disassemble
154 --disassemble=symbol
155 Display the assembler mnemonics for the machine instructions from
156 the input file. This option only disassembles those sections which
157 are expected to contain instructions. If the optional symbol
158 argument is given, then display the assembler mnemonics starting at
159 symbol. If symbol is a function name then disassembly will stop at
160 the end of the function, otherwise it will stop when the next
161 symbol is encountered. If there are no matches for symbol then
162 nothing will be displayed.
163 Note if the --dwarf=follow-links option is enabled then any symbol
165 tables in linked debug info files will be read in and used when
166 disassembling.
167 -D
169 --disassemble-all
170 Like -d, but disassemble the contents of all sections, not just
171 those expected to contain instructions.
172 This option also has a subtle effect on the disassembly of
174 instructions in code sections. When option -d is in effect objdump
175 will assume that any symbols present in a code section occur on the
176 boundary between instructions and it will refuse to disassemble
177 across such a boundary. When option -D is in effect however this
178 assumption is supressed. This means that it is possible for the
179 output of -d and -D to differ if, for example, data is stored in
180 code sections.
181 If the target is an ARM architecture this switch also has the
183 effect of forcing the disassembler to decode pieces of data found
184 in code sections as if they were instructions.
185 Note if the --dwarf=follow-links option is enabled then any symbol
187 tables in linked debug info files will be read in and used when
188 disassembling.
189 --no-addresses
191 When disassembling, don't print addresses on each line or for
192 symbols and relocation offsets. In combination with
193 --no-show-raw-insn this may be useful for comparing compiler
194 output.
195 --prefix-addresses
197 When disassembling, print the complete address on each line. This
198 is the older disassembly format.
199 -EB
201 -EL
202 --endian={big|little}
203 Specify the endianness of the object files. This only affects
204 disassembly. This can be useful when disassembling a file format
205 which does not describe endianness information, such as S-records.
206 -f
208 --file-headers
209 Display summary information from the overall header of each of the
210 objfile files.
211 -F
213 --file-offsets
214 When disassembling sections, whenever a symbol is displayed, also
215 display the file offset of the region of data that is about to be
216 dumped. If zeroes are being skipped, then when disassembly
217 resumes, tell the user how many zeroes were skipped and the file
218 offset of the location from where the disassembly resumes. When
219 dumping sections, display the file offset of the location from
220 where the dump starts.
221 --file-start-context
223 Specify that when displaying interlisted source code/disassembly
224 (assumes -S) from a file that has not yet been displayed, extend
225 the context to the start of the file.
226 -h
228 --section-headers
229 --headers
230 Display summary information from the section headers of the object
231 file.
232 File segments may be relocated to nonstandard addresses, for
234 example by using the -Ttext, -Tdata, or -Tbss options to ld.
235 However, some object file formats, such as a.out, do not store the
236 starting address of the file segments. In those situations,
237 although ld relocates the sections correctly, using objdump -h to
238 list the file section headers cannot show the correct addresses.
239 Instead, it shows the usual addresses, which are implicit for the
240 target.
241 Note, in some cases it is possible for a section to have both the
243 READONLY and the NOREAD attributes set. In such cases the NOREAD
244 attribute takes precedence, but objdump will report both since the
245 exact setting of the flag bits might be important.
246 -H
248 --help
249 Print a summary of the options to objdump and exit.
250 -i
252 --info
253 Display a list showing all architectures and object formats
254 available for specification with -b or -m.
255 -j name
257 --section=name
258 Display information only for section name.
259 -L
261 --process-links
262 Display the contents of non-debug sections found in separate
263 debuginfo files that are linked to the main file. This option
264 automatically implies the -WK option, and only sections requested
265 by other command line options will be displayed.
266 -l
268 --line-numbers
269 Label the display (using debugging information) with the filename
270 and source line numbers corresponding to the object code or relocs
271 shown. Only useful with -d, -D, or -r.
272 -m machine
274 --architecture=machine
275 Specify the architecture to use when disassembling object files.
276 This can be useful when disassembling object files which do not
277 describe architecture information, such as S-records. You can list
278 the available architectures with the -i option.
279 If the target is an ARM architecture then this switch has an
281 additional effect. It restricts the disassembly to only those
282 instructions supported by the architecture specified by machine.
283 If it is necessary to use this switch because the input file does
284 not contain any architecture information, but it is also desired to
285 disassemble all the instructions use -marm.
286 -M options
288 --disassembler-options=options
289 Pass target specific information to the disassembler. Only
290 supported on some targets. If it is necessary to specify more than
291 one disassembler option then multiple -M options can be used or can
292 be placed together into a comma separated list.
293 For ARC, dsp controls the printing of DSP instructions, spfp
295 selects the printing of FPX single precision FP instructions, dpfp
296 selects the printing of FPX double precision FP instructions,
297 quarkse_em selects the printing of special QuarkSE-EM instructions,
298 fpuda selects the printing of double precision assist instructions,
299 fpus selects the printing of FPU single precision FP instructions,
300 while fpud selects the printing of FPU double precision FP
301 instructions. Additionally, one can choose to have all the
302 immediates printed in hexadecimal using hex. By default, the short
303 immediates are printed using the decimal representation, while the
304 long immediate values are printed as hexadecimal.
305 cpu=... allows one to enforce a particular ISA when disassembling
307 instructions, overriding the -m value or whatever is in the ELF
308 file. This might be useful to select ARC EM or HS ISA, because
309 architecture is same for those and disassembler relies on private
310 ELF header data to decide if code is for EM or HS. This option
311 might be specified multiple times - only the latest value will be
312 used. Valid values are same as for the assembler -mcpu=... option.
313 If the target is an ARM architecture then this switch can be used
315 to select which register name set is used during disassembler.
316 Specifying -M reg-names-std (the default) will select the register
317 names as used in ARM's instruction set documentation, but with
318 register 13 called 'sp', register 14 called 'lr' and register 15
319 called 'pc'. Specifying -M reg-names-apcs will select the name set
320 used by the ARM Procedure Call Standard, whilst specifying -M reg-
321 names-raw will just use r followed by the register number.
322 There are also two variants on the APCS register naming scheme
324 enabled by -M reg-names-atpcs and -M reg-names-special-atpcs which
325 use the ARM/Thumb Procedure Call Standard naming conventions.
326 (Either with the normal register names or the special register
327 names).
328 This option can also be used for ARM architectures to force the
330 disassembler to interpret all instructions as Thumb instructions by
331 using the switch --disassembler-options=force-thumb. This can be
332 useful when attempting to disassemble thumb code produced by other
333 compilers.
334 For AArch64 targets this switch can be used to set whether
336 instructions are disassembled as the most general instruction using
337 the -M no-aliases option or whether instruction notes should be
338 generated as comments in the disasssembly using -M notes.
339 For the x86, some of the options duplicate functions of the -m
341 switch, but allow finer grained control.
342 "x86-64"
344 "i386"
345 "i8086"
346 Select disassembly for the given architecture.
347 "intel"
349 "att"
350 Select between intel syntax mode and AT&T syntax mode.
351 "amd64"
353 "intel64"
354 Select between AMD64 ISA and Intel64 ISA.
355 "intel-mnemonic"
357 "att-mnemonic"
358 Select between intel mnemonic mode and AT&T mnemonic mode.
359 Note: "intel-mnemonic" implies "intel" and "att-mnemonic"
360 implies "att".
361 "addr64"
363 "addr32"
364 "addr16"
365 "data32"
366 "data16"
367 Specify the default address size and operand size. These five
368 options will be overridden if "x86-64", "i386" or "i8086"
369 appear later in the option string.
370 "suffix"
372 When in AT&T mode and also for a limited set of instructions
373 when in Intel mode, instructs the disassembler to print a
374 mnemonic suffix even when the suffix could be inferred by the
375 operands or, for certain instructions, the execution mode's
376 defaults.
377 For PowerPC, the -M argument raw selects disasssembly of hardware
379 insns rather than aliases. For example, you will see "rlwinm"
380 rather than "clrlwi", and "addi" rather than "li". All of the -m
381 arguments for gas that select a CPU are supported. These are: 403,
382 405, 440, 464, 476, 601, 603, 604, 620, 7400, 7410, 7450, 7455,
383 750cl, 821, 850, 860, a2, booke, booke32, cell, com, e200z4, e300,
384 e500, e500mc, e500mc64, e500x2, e5500, e6500, efs, power4, power5,
385 power6, power7, power8, power9, power10, ppc, ppc32, ppc64,
386 ppc64bridge, ppcps, pwr, pwr2, pwr4, pwr5, pwr5x, pwr6, pwr7, pwr8,
387 pwr9, pwr10, pwrx, titan, and vle. 32 and 64 modify the default or
388 a prior CPU selection, disabling and enabling 64-bit insns
389 respectively. In addition, altivec, any, htm, vsx, and spe add
390 capabilities to a previous or later CPU selection. any will
391 disassemble any opcode known to binutils, but in cases where an
392 opcode has two different meanings or different arguments, you may
393 not see the disassembly you expect. If you disassemble without
394 giving a CPU selection, a default will be chosen from information
395 gleaned by BFD from the object files headers, but the result again
396 may not be as you expect.
397 For MIPS, this option controls the printing of instruction mnemonic
399 names and register names in disassembled instructions. Multiple
400 selections from the following may be specified as a comma separated
401 string, and invalid options are ignored:
402 "no-aliases"
404 Print the 'raw' instruction mnemonic instead of some pseudo
405 instruction mnemonic. I.e., print 'daddu' or 'or' instead of
406 'move', 'sll' instead of 'nop', etc.
407 "msa"
409 Disassemble MSA instructions.
410 "virt"
412 Disassemble the virtualization ASE instructions.
413 "xpa"
415 Disassemble the eXtended Physical Address (XPA) ASE
416 instructions.
417 "gpr-names=ABI"
419 Print GPR (general-purpose register) names as appropriate for
420 the specified ABI. By default, GPR names are selected
421 according to the ABI of the binary being disassembled.
422 "fpr-names=ABI"
424 Print FPR (floating-point register) names as appropriate for
425 the specified ABI. By default, FPR numbers are printed rather
426 than names.
427 "cp0-names=ARCH"
429 Print CP0 (system control coprocessor; coprocessor 0) register
430 names as appropriate for the CPU or architecture specified by
431 ARCH. By default, CP0 register names are selected according to
432 the architecture and CPU of the binary being disassembled.
433 "hwr-names=ARCH"
435 Print HWR (hardware register, used by the "rdhwr" instruction)
436 names as appropriate for the CPU or architecture specified by
437 ARCH. By default, HWR names are selected according to the
438 architecture and CPU of the binary being disassembled.
439 "reg-names=ABI"
441 Print GPR and FPR names as appropriate for the selected ABI.
442 "reg-names=ARCH"
444 Print CPU-specific register names (CP0 register and HWR names)
445 as appropriate for the selected CPU or architecture.
446 For any of the options listed above, ABI or ARCH may be specified
448 as numeric to have numbers printed rather than names, for the
449 selected types of registers. You can list the available values of
450 ABI and ARCH using the --help option.
451 For VAX, you can specify function entry addresses with -M
453 entry:0xf00ba. You can use this multiple times to properly
454 disassemble VAX binary files that don't contain symbol tables (like
455 ROM dumps). In these cases, the function entry mask would
456 otherwise be decoded as VAX instructions, which would probably lead
457 the rest of the function being wrongly disassembled.
458 -p
460 --private-headers
461 Print information that is specific to the object file format. The
462 exact information printed depends upon the object file format. For
463 some object file formats, no additional information is printed.
464 -P options
466 --private=options
467 Print information that is specific to the object file format. The
468 argument options is a comma separated list that depends on the
469 format (the lists of options is displayed with the help).
470 For XCOFF, the available options are:
472 "header"
474 "aout"
475 "sections"
476 "syms"
477 "relocs"
478 "lineno,"
479 "loader"
480 "except"
481 "typchk"
482 "traceback"
483 "toc"
484 "ldinfo"
485 Not all object formats support this option. In particular the ELF
487 format does not use it.
488 -r
490 --reloc
491 Print the relocation entries of the file. If used with -d or -D,
492 the relocations are printed interspersed with the disassembly.
493 -R
495 --dynamic-reloc
496 Print the dynamic relocation entries of the file. This is only
497 meaningful for dynamic objects, such as certain types of shared
498 libraries. As for -r, if used with -d or -D, the relocations are
499 printed interspersed with the disassembly.
500 -s
502 --full-contents
503 Display the full contents of any sections requested. By default
504 all non-empty sections are displayed.
505 -S
507 --source
508 Display source code intermixed with disassembly, if possible.
509 Implies -d.
510 --source-comment[=txt]
512 Like the -S option, but all source code lines are displayed with a
513 prefix of txt. Typically txt will be a comment string which can be
514 used to distinguish the assembler code from the source code. If
515 txt is not provided then a default string of "# " (hash followed by
516 a space), will be used.
517 --prefix=prefix
519 Specify prefix to add to the absolute paths when used with -S.
520 --prefix-strip=level
522 Indicate how many initial directory names to strip off the
523 hardwired absolute paths. It has no effect without --prefix=prefix.
524 --show-raw-insn
526 When disassembling instructions, print the instruction in hex as
527 well as in symbolic form. This is the default except when
528 --prefix-addresses is used.
529 --no-show-raw-insn
531 When disassembling instructions, do not print the instruction
532 bytes. This is the default when --prefix-addresses is used.
533 --insn-width=width
535 Display width bytes on a single line when disassembling
536 instructions.
537 --visualize-jumps[=color|=extended-color|=off]
539 Visualize jumps that stay inside a function by drawing ASCII art
540 between the start and target addresses. The optional =color
541 argument adds color to the output using simple terminal colors.
542 Alternatively the =extended-color argument will add color using
543 8bit colors, but these might not work on all terminals.
544 If it is necessary to disable the visualize-jumps option after it
546 has previously been enabled then use visualize-jumps=off.
547 --disassembler-color=[color|extended-color|off]
549 Apply syntax highlighting to the disassembler output. The color
550 argument adds color using simple terminal colors. Alternatively
551 the extended-color argument will use 8bit colors, but these might
552 not work on all terminals.
553 If it is necessary to disable the --disassembler-color option after
555 it has previously been enabled then use --disassembler-color=off.
556 -W[lLiaprmfFsoORtUuTgAckK]
558 --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]
559 Displays the contents of the DWARF debug sections in the file, if
560 any are present. Compressed debug sections are automatically
561 decompressed (temporarily) before they are displayed. If one or
562 more of the optional letters or words follows the switch then only
563 those type(s) of data will be dumped. The letters and words refer
564 to the following information:
565 "a"
567 "=abbrev"
568 Displays the contents of the .debug_abbrev section.
569 "A"
571 "=addr"
572 Displays the contents of the .debug_addr section.
573 "c"
575 "=cu_index"
576 Displays the contents of the .debug_cu_index and/or
577 .debug_tu_index sections.
578 "f"
580 "=frames"
581 Display the raw contents of a .debug_frame section.
582 "F"
584 "=frames-interp"
585 Display the interpreted contents of a .debug_frame section.
586 "g"
588 "=gdb_index"
589 Displays the contents of the .gdb_index and/or .debug_names
590 sections.
591 "i"
593 "=info"
594 Displays the contents of the .debug_info section. Note: the
595 output from this option can also be restricted by the use of
596 the --dwarf-depth and --dwarf-start options.
597 "k"
599 "=links"
600 Displays the contents of the .gnu_debuglink, .gnu_debugaltlink
601 and .debug_sup sections, if any of them are present. Also
602 displays any links to separate dwarf object files (dwo), if
603 they are specified by the DW_AT_GNU_dwo_name or DW_AT_dwo_name
604 attributes in the .debug_info section.
605 "K"
607 "=follow-links"
608 Display the contents of any selected debug sections that are
609 found in linked, separate debug info file(s). This can result
610 in multiple versions of the same debug section being displayed
611 if it exists in more than one file.
612 In addition, when displaying DWARF attributes, if a form is
614 found that references the separate debug info file, then the
615 referenced contents will also be displayed.
616 Note - in some distributions this option is enabled by default.
618 It can be disabled via the N debug option. The default can be
619 chosen when configuring the binutils via the
620 --enable-follow-debug-links=yes or
621 --enable-follow-debug-links=no options. If these are not used
622 then the default is to enable the following of debug links.
623 Note - if support for the debuginfod protocol was enabled when
625 the binutils were built then this option will also include an
626 attempt to contact any debuginfod servers mentioned in the
627 DEBUGINFOD_URLS environment variable. This could take some
628 time to resolve. This behaviour can be disabled via the
629 =do-not-use-debuginfod debug option.
630 "N"
632 "=no-follow-links"
633 Disables the following of links to separate debug info files.
634 "D"
636 "=use-debuginfod"
637 Enables contacting debuginfod servers if there is a need to
638 follow debug links. This is the default behaviour.
639 "E"
641 "=do-not-use-debuginfod"
642 Disables contacting debuginfod servers when there is a need to
643 follow debug links.
644 "l"
646 "=rawline"
647 Displays the contents of the .debug_line section in a raw
648 format.
649 "L"
651 "=decodedline"
652 Displays the interpreted contents of the .debug_line section.
653 "m"
655 "=macro"
656 Displays the contents of the .debug_macro and/or .debug_macinfo
657 sections.
658 "o"
660 "=loc"
661 Displays the contents of the .debug_loc and/or .debug_loclists
662 sections.
663 "O"
665 "=str-offsets"
666 Displays the contents of the .debug_str_offsets section.
667 "p"
669 "=pubnames"
670 Displays the contents of the .debug_pubnames and/or
671 .debug_gnu_pubnames sections.
672 "r"
674 "=aranges"
675 Displays the contents of the .debug_aranges section.
676 "R"
678 "=Ranges"
679 Displays the contents of the .debug_ranges and/or
680 .debug_rnglists sections.
681 "s"
683 "=str"
684 Displays the contents of the .debug_str, .debug_line_str and/or
685 .debug_str_offsets sections.
686 "t"
688 "=pubtype"
689 Displays the contents of the .debug_pubtypes and/or
690 .debug_gnu_pubtypes sections.
691 "T"
693 "=trace_aranges"
694 Displays the contents of the .trace_aranges section.
695 "u"
697 "=trace_abbrev"
698 Displays the contents of the .trace_abbrev section.
699 "U"
701 "=trace_info"
702 Displays the contents of the .trace_info section.
703 Note: displaying the contents of .debug_static_funcs,
705 .debug_static_vars and debug_weaknames sections is not currently
706 supported.
707 --dwarf-depth=n
709 Limit the dump of the ".debug_info" section to n children. This is
710 only useful with --debug-dump=info. The default is to print all
711 DIEs; the special value 0 for n will also have this effect.
712 With a non-zero value for n, DIEs at or deeper than n levels will
714 not be printed. The range for n is zero-based.
715 --dwarf-start=n
717 Print only DIEs beginning with the DIE numbered n. This is only
718 useful with --debug-dump=info.
719 If specified, this option will suppress printing of any header
721 information and all DIEs before the DIE numbered n. Only siblings
722 and children of the specified DIE will be printed.
723 This can be used in conjunction with --dwarf-depth.
725 --dwarf-check
727 Enable additional checks for consistency of Dwarf information.
728 --ctf[=section]
730 Display the contents of the specified CTF section. CTF sections
731 themselves contain many subsections, all of which are displayed in
732 order.
733 By default, display the name of the section named .ctf, which is
735 the name emitted by ld.
736 --ctf-parent=member
738 If the CTF section contains ambiguously-defined types, it will
739 consist of an archive of many CTF dictionaries, all inheriting from
740 one dictionary containing unambiguous types. This member is by
741 default named .ctf, like the section containing it, but it is
742 possible to change this name using the
743 "ctf_link_set_memb_name_changer" function at link time. When
744 looking at CTF archives that have been created by a linker that
745 uses the name changer to rename the parent archive member,
746 --ctf-parent can be used to specify the name used for the parent.
747 -G
749 --stabs
750 Display the full contents of any sections requested. Display the
751 contents of the .stab and .stab.index and .stab.excl sections from
752 an ELF file. This is only useful on systems (such as Solaris 2.0)
753 in which ".stab" debugging symbol-table entries are carried in an
754 ELF section. In most other file formats, debugging symbol-table
755 entries are interleaved with linkage symbols, and are visible in
756 the --syms output.
757 --start-address=address
759 Start displaying data at the specified address. This affects the
760 output of the -d, -r and -s options.
761 --stop-address=address
763 Stop displaying data at the specified address. This affects the
764 output of the -d, -r and -s options.
765 -t
767 --syms
768 Print the symbol table entries of the file. This is similar to the
769 information provided by the nm program, although the display format
770 is different. The format of the output depends upon the format of
771 the file being dumped, but there are two main types. One looks
772 like this:
773 [ 4](sec 3)(fl 0x00)(ty 0)(scl 3) (nx 1) 0x00000000 .bss
775 [ 6](sec 1)(fl 0x00)(ty 0)(scl 2) (nx 0) 0x00000000 fred
776 where the number inside the square brackets is the number of the
778 entry in the symbol table, the sec number is the section number,
779 the fl value are the symbol's flag bits, the ty number is the
780 symbol's type, the scl number is the symbol's storage class and the
781 nx value is the number of auxiliary entries associated with the
782 symbol. The last two fields are the symbol's value and its name.
783 The other common output format, usually seen with ELF based files,
785 looks like this:
786 00000000 l d .bss 00000000 .bss
788 00000000 g .text 00000000 fred
789 Here the first number is the symbol's value (sometimes referred to
791 as its address). The next field is actually a set of characters
792 and spaces indicating the flag bits that are set on the symbol.
793 These characters are described below. Next is the section with
794 which the symbol is associated or *ABS* if the section is absolute
795 (ie not connected with any section), or *UND* if the section is
796 referenced in the file being dumped, but not defined there.
797 After the section name comes another field, a number, which for
799 common symbols is the alignment and for other symbol is the size.
800 Finally the symbol's name is displayed.
801 The flag characters are divided into 7 groups as follows:
803 "l"
805 "g"
806 "u"
807 "!" The symbol is a local (l), global (g), unique global (u),
808 neither global nor local (a space) or both global and local
809 (!). A symbol can be neither local or global for a variety of
810 reasons, e.g., because it is used for debugging, but it is
811 probably an indication of a bug if it is ever both local and
812 global. Unique global symbols are a GNU extension to the
813 standard set of ELF symbol bindings. For such a symbol the
814 dynamic linker will make sure that in the entire process there
815 is just one symbol with this name and type in use.
816 "w" The symbol is weak (w) or strong (a space).
818 "C" The symbol denotes a constructor (C) or an ordinary symbol (a
820 space).
821 "W" The symbol is a warning (W) or a normal symbol (a space). A
823 warning symbol's name is a message to be displayed if the
824 symbol following the warning symbol is ever referenced.
825 "I"
827 "i" The symbol is an indirect reference to another symbol (I), a
828 function to be evaluated during reloc processing (i) or a
829 normal symbol (a space).
830 "d"
832 "D" The symbol is a debugging symbol (d) or a dynamic symbol (D) or
833 a normal symbol (a space).
834 "F"
836 "f"
837 "O" The symbol is the name of a function (F) or a file (f) or an
838 object (O) or just a normal symbol (a space).
839 -T
841 --dynamic-syms
842 Print the dynamic symbol table entries of the file. This is only
843 meaningful for dynamic objects, such as certain types of shared
844 libraries. This is similar to the information provided by the nm
845 program when given the -D (--dynamic) option.
846 The output format is similar to that produced by the --syms option,
848 except that an extra field is inserted before the symbol's name,
849 giving the version information associated with the symbol. If the
850 version is the default version to be used when resolving
851 unversioned references to the symbol then it's displayed as is,
852 otherwise it's put into parentheses.
853 --special-syms
855 When displaying symbols include those which the target considers to
856 be special in some way and which would not normally be of interest
857 to the user.
858 -U [d|i|l|e|x|h]
860 --unicode=[default|invalid|locale|escape|hex|highlight]
861 Controls the display of UTF-8 encoded multibyte characters in
862 strings. The default (--unicode=default) is to give them no
863 special treatment. The --unicode=locale option displays the
864 sequence in the current locale, which may or may not support them.
865 The options --unicode=hex and --unicode=invalid display them as hex
866 byte sequences enclosed by either angle brackets or curly braces.
867 The --unicode=escape option displays them as escape sequences
869 (\uxxxx) and the --unicode=highlight option displays them as escape
870 sequences highlighted in red (if supported by the output device).
871 The colouring is intended to draw attention to the presence of
872 unicode sequences where they might not be expected.
873 -V
875 --version
876 Print the version number of objdump and exit.
877 -x
879 --all-headers
880 Display all available header information, including the symbol
881 table and relocation entries. Using -x is equivalent to specifying
882 all of -a -f -h -p -r -t.
883 -w
885 --wide
886 Format some lines for output devices that have more than 80
887 columns. Also do not truncate symbol names when they are
888 displayed.
889 -z
891 --disassemble-zeroes
892 Normally the disassembly output will skip blocks of zeroes. This
893 option directs the disassembler to disassemble those blocks, just
894 like any other data.
895 @file
897 Read command-line options from file. The options read are inserted
898 in place of the original @file option. If file does not exist, or
899 cannot be read, then the option will be treated literally, and not
900 removed.
901 Options in file are separated by whitespace. A whitespace
903 character may be included in an option by surrounding the entire
904 option in either single or double quotes. Any character (including
905 a backslash) may be included by prefixing the character to be
906 included with a backslash. The file may itself contain additional
907 @file options; any such options will be processed recursively.
908
910 nm(1), readelf(1), and the Info entries for binutils.
911
913 Copyright (c) 1991-2022 Free Software Foundation, Inc.
914 Permission is granted to copy, distribute and/or modify this document
916 under the terms of the GNU Free Documentation License, Version 1.3 or
917 any later version published by the Free Software Foundation; with no
918 Invariant Sections, with no Front-Cover Texts, and with no Back-Cover
919 Texts. A copy of the license is included in the section entitled "GNU
920 Free Documentation License".
921binutils-2.39 2022-08-31 OBJDUMP(1)