Provided by: binutils-msp430_2.22~msp20120406-5.1_amd64 
NAME
objdump - display information from object files.
SYNOPSIS
objdump [-a|--archive-headers]
[-b bfdname|--target=bfdname]
[-C|--demangle[=style] ]
[-d|--disassemble]
[-D|--disassemble-all]
[-z|--disassemble-zeroes]
[-EB|-EL|--endian={big | little }]
[-f|--file-headers]
[-F|--file-offsets]
[--file-start-context]
[-g|--debugging]
[-e|--debugging-tags]
[-h|--section-headers|--headers]
[-i|--info]
[-j section|--section=section]
[-l|--line-numbers]
[-S|--source]
[-m machine|--architecture=machine]
[-M options|--disassembler-options=options]
[-p|--private-headers]
[-r|--reloc]
[-R|--dynamic-reloc]
[-s|--full-contents]
[-W[lLiaprmfFsoRt]|
--dwarf[=rawline,=decodedline,=info,=abbrev,=pubnames,=aranges,=macro,=frames,=frames-interp,=str,=loc,=Ranges,=pubtypes,=trace_info,=trace_abbrev,=trace_aranges,=gdb_index]]
[-G|--stabs]
[-t|--syms]
[-T|--dynamic-syms]
[-x|--all-headers]
[-w|--wide]
[--start-address=address]
[--stop-address=address]
[--prefix-addresses]
[--[no-]show-raw-insn]
[--adjust-vma=offset]
[--special-syms]
[--prefix=prefix]
[--prefix-strip=level]
[--insn-width=width]
[-V|--version]
[-H|--help]
objfile...
DESCRIPTION
objdump displays information about one or more object files. The options control what particular
information to display. This information is mostly useful to programmers who are working on the
compilation tools, as opposed to programmers who just want their program to compile and work.
objfile... are the object files to be examined. When you specify archives, objdump shows information on
each of the member object files.
OPTIONS
The long and short forms of options, shown here as alternatives, are equivalent. At least one option
from the list -a,-d,-D,-e,-f,-g,-G,-h,-H,-p,-r,-R,-s,-S,-t,-T,-V,-x must be given.
-a
--archive-header
If any of the objfile files are archives, display the archive header information (in a format similar
to ls -l). Besides the information you could list with ar tv, objdump -a shows the object file
format of each archive member.
--adjust-vma=offset
When dumping information, first add offset to all the section addresses. This is useful if the
section addresses do not correspond to the symbol table, which can happen when putting sections at
particular addresses when using a format which can not represent section addresses, such as a.out.
-b bfdname
--target=bfdname
Specify that the object-code format for the object files is bfdname. This option may not be
necessary; objdump can automatically recognize many formats.
For example,
objdump -b oasys -m vax -h fu.o
displays summary information from the section headers (-h) of fu.o, which is explicitly identified
(-m) as a VAX object file in the format produced by Oasys compilers. You can list the formats
available with the -i option.
-C
--demangle[=style]
Decode (demangle) low-level symbol names into user-level names. Besides removing any initial
underscore prepended by the system, this makes C++ function names readable. Different compilers have
different mangling styles. The optional demangling style argument can be used to choose an
appropriate demangling style for your compiler.
-g
--debugging
Display debugging information. This attempts to parse STABS and IEEE debugging format information
stored in the file and print it out using a C like syntax. If neither of these formats are found
this option falls back on the -W option to print any DWARF information in the file.
-e
--debugging-tags
Like -g, but the information is generated in a format compatible with ctags tool.
-d
--disassemble
Display the assembler mnemonics for the machine instructions from objfile. This option only
disassembles those sections which are expected to contain instructions.
-D
--disassemble-all
Like -d, but disassemble the contents of all sections, not just those expected to contain
instructions.
If the target is an ARM architecture this switch also has the effect of forcing the disassembler to
decode pieces of data found in code sections as if they were instructions.
--prefix-addresses
When disassembling, print the complete address on each line. This is the older disassembly format.
-EB
-EL
--endian={big|little}
Specify the endianness of the object files. This only affects disassembly. This can be useful when
disassembling a file format which does not describe endianness information, such as S-records.
-f
--file-headers
Display summary information from the overall header of each of the objfile files.
-F
--file-offsets
When disassembling sections, whenever a symbol is displayed, also display the file offset of the
region of data that is about to be dumped. If zeroes are being skipped, then when disassembly
resumes, tell the user how many zeroes were skipped and the file offset of the location from where
the disassembly resumes. When dumping sections, display the file offset of the location from where
the dump starts.
--file-start-context
Specify that when displaying interlisted source code/disassembly (assumes -S) from a file that has
not yet been displayed, extend the context to the start of the file.
-h
--section-headers
--headers
Display summary information from the section headers of the object file.
File segments may be relocated to nonstandard addresses, for example by using the -Ttext, -Tdata, or
-Tbss options to ld. However, some object file formats, such as a.out, do not store the starting
address of the file segments. In those situations, although ld relocates the sections correctly,
using objdump -h to list the file section headers cannot show the correct addresses. Instead, it
shows the usual addresses, which are implicit for the target.
-H
--help
Print a summary of the options to objdump and exit.
-i
--info
Display a list showing all architectures and object formats available for specification with -b or
-m.
-j name
--section=name
Display information only for section name.
-l
--line-numbers
Label the display (using debugging information) with the filename and source line numbers
corresponding to the object code or relocs shown. Only useful with -d, -D, or -r.
-m machine
--architecture=machine
Specify the architecture to use when disassembling object files. This can be useful when
disassembling object files which do not describe architecture information, such as S-records. You
can list the available architectures with the -i option.
If the target is an ARM architecture then this switch has an additional effect. It restricts the
disassembly to only those instructions supported by the architecture specified by machine. If it is
necessary to use this switch because the input file does not contain any architecture information,
but it is also desired to disassemble all the instructions use -marm.
-M options
--disassembler-options=options
Pass target specific information to the disassembler. Only supported on some targets. If it is
necessary to specify more than one disassembler option then multiple -M options can be used or can be
placed together into a comma separated list.
If the target is an ARM architecture then this switch can be used to select which register name set
is used during disassembler. Specifying -M reg-names-std (the default) will select the register
names as used in ARM's instruction set documentation, but with register 13 called 'sp', register 14
called 'lr' and register 15 called 'pc'. Specifying -M reg-names-apcs will select the name set used
by the ARM Procedure Call Standard, whilst specifying -M reg-names-raw will just use r followed by
the register number.
There are also two variants on the APCS register naming scheme enabled by -M reg-names-atpcs and -M
reg-names-special-atpcs which use the ARM/Thumb Procedure Call Standard naming conventions. (Either
with the normal register names or the special register names).
This option can also be used for ARM architectures to force the disassembler to interpret all
instructions as Thumb instructions by using the switch --disassembler-options=force-thumb. This can
be useful when attempting to disassemble thumb code produced by other compilers.
For the x86, some of the options duplicate functions of the -m switch, but allow finer grained
control. Multiple selections from the following may be specified as a comma separated string.
x86-64, i386 and i8086 select disassembly for the given architecture. intel and att select between
intel syntax mode and AT&T syntax mode. intel-mnemonic and att-mnemonic select between intel
mnemonic mode and AT&T mnemonic mode. intel-mnemonic implies intel and att-mnemonic implies att.
addr64, addr32, addr16, data32 and data16 specify the default address size and operand size. These
four options will be overridden if x86-64, i386 or i8086 appear later in the option string. Lastly,
suffix, when in AT&T mode, instructs the disassembler to print a mnemonic suffix even when the suffix
could be inferred by the operands.
For PowerPC, booke controls the disassembly of BookE instructions. 32 and 64 select PowerPC and
PowerPC64 disassembly, respectively. e300 selects disassembly for the e300 family. 440 selects
disassembly for the PowerPC 440. ppcps selects disassembly for the paired single instructions of the
PPC750CL.
For MIPS, this option controls the printing of instruction mnemonic names and register names in
disassembled instructions. Multiple selections from the following may be specified as a comma
separated string, and invalid options are ignored:
"no-aliases"
Print the 'raw' instruction mnemonic instead of some pseudo instruction mnemonic. I.e., print
'daddu' or 'or' instead of 'move', 'sll' instead of 'nop', etc.
"gpr-names=ABI"
Print GPR (general-purpose register) names as appropriate for the specified ABI. By default, GPR
names are selected according to the ABI of the binary being disassembled.
"fpr-names=ABI"
Print FPR (floating-point register) names as appropriate for the specified ABI. By default, FPR
numbers are printed rather than names.
"cp0-names=ARCH"
Print CP0 (system control coprocessor; coprocessor 0) register names as appropriate for the CPU
or architecture specified by ARCH. By default, CP0 register names are selected according to the
architecture and CPU of the binary being disassembled.
"hwr-names=ARCH"
Print HWR (hardware register, used by the "rdhwr" instruction) names as appropriate for the CPU
or architecture specified by ARCH. By default, HWR names are selected according to the
architecture and CPU of the binary being disassembled.
"reg-names=ABI"
Print GPR and FPR names as appropriate for the selected ABI.
"reg-names=ARCH"
Print CPU-specific register names (CP0 register and HWR names) as appropriate for the selected
CPU or architecture.
For any of the options listed above, ABI or ARCH may be specified as numeric to have numbers printed
rather than names, for the selected types of registers. You can list the available values of ABI and
ARCH using the --help option.
For VAX, you can specify function entry addresses with -M entry:0xf00ba. You can use this multiple
times to properly disassemble VAX binary files that don't contain symbol tables (like ROM dumps). In
these cases, the function entry mask would otherwise be decoded as VAX instructions, which would
probably lead the rest of the function being wrongly disassembled.
-p
--private-headers
Print information that is specific to the object file format. The exact information printed depends
upon the object file format. For some object file formats, no additional information is printed.
-r
--reloc
Print the relocation entries of the file. If used with -d or -D, the relocations are printed
interspersed with the disassembly.
-R
--dynamic-reloc
Print the dynamic relocation entries of the file. This is only meaningful for dynamic objects, such
as certain types of shared libraries. As for -r, if used with -d or -D, the relocations are printed
interspersed with the disassembly.
-s
--full-contents
Display the full contents of any sections requested. By default all non-empty sections are
displayed.
-S
--source
Display source code intermixed with disassembly, if possible. Implies -d.
--prefix=prefix
Specify prefix to add to the absolute paths when used with -S.
--prefix-strip=level
Indicate how many initial directory names to strip off the hardwired absolute paths. It has no effect
without --prefix=prefix.
--show-raw-insn
When disassembling instructions, print the instruction in hex as well as in symbolic form. This is
the default except when --prefix-addresses is used.
--no-show-raw-insn
When disassembling instructions, do not print the instruction bytes. This is the default when
--prefix-addresses is used.
--insn-width=width
Display width bytes on a single line when disassembling instructions.
-W[lLiaprmfFsoRt]
--dwarf[=rawline,=decodedline,=info,=abbrev,=pubnames,=aranges,=macro,=frames,=frames-interp,=str,=loc,=Ranges,=pubtypes,=trace_info,=trace_abbrev,=trace_aranges,=gdb_index]
Displays the contents of the debug sections in the file, if any are present. If one of the optional
letters or words follows the switch then only data found in those specific sections will be dumped.
Note that there is no single letter option to display the content of trace sections or .gdb_index.
-G
--stabs
Display the full contents of any sections requested. Display the contents of the .stab and
.stab.index and .stab.excl sections from an ELF file. This is only useful on systems (such as
Solaris 2.0) in which ".stab" debugging symbol-table entries are carried in an ELF section. In most
other file formats, debugging symbol-table entries are interleaved with linkage symbols, and are
visible in the --syms output.
--start-address=address
Start displaying data at the specified address. This affects the output of the -d, -r and -s
options.
--stop-address=address
Stop displaying data at the specified address. This affects the output of the -d, -r and -s options.
-t
--syms
Print the symbol table entries of the file. This is similar to the information provided by the nm
program, although the display format is different. The format of the output depends upon the format
of the file being dumped, but there are two main types. One looks like this:
[ 4](sec 3)(fl 0x00)(ty 0)(scl 3) (nx 1) 0x00000000 .bss
[ 6](sec 1)(fl 0x00)(ty 0)(scl 2) (nx 0) 0x00000000 fred
where the number inside the square brackets is the number of the entry in the symbol table, the sec
number is the section number, the fl value are the symbol's flag bits, the ty number is the symbol's
type, the scl number is the symbol's storage class and the nx value is the number of auxilary entries
associated with the symbol. The last two fields are the symbol's value and its name.
The other common output format, usually seen with ELF based files, looks like this:
00000000 l d .bss 00000000 .bss
00000000 g .text 00000000 fred
Here the first number is the symbol's value (sometimes refered to as its address). The next field is
actually a set of characters and spaces indicating the flag bits that are set on the symbol. These
characters are described below. Next is the section with which the symbol is associated or *ABS* if
the section is absolute (ie not connected with any section), or *UND* if the section is referenced in
the file being dumped, but not defined there.
After the section name comes another field, a number, which for common symbols is the alignment and
for other symbol is the size. Finally the symbol's name is displayed.
The flag characters are divided into 7 groups as follows:
"l"
"g"
"u"
"!" The symbol is a local (l), global (g), unique global (u), neither global nor local (a space) or
both global and local (!). A symbol can be neither local or global for a variety of reasons,
e.g., because it is used for debugging, but it is probably an indication of a bug if it is ever
both local and global. Unique global symbols are a GNU extension to the standard set of ELF
symbol bindings. For such a symbol the dynamic linker will make sure that in the entire process
there is just one symbol with this name and type in use.
"w" The symbol is weak (w) or strong (a space).
"C" The symbol denotes a constructor (C) or an ordinary symbol (a space).
"W" The symbol is a warning (W) or a normal symbol (a space). A warning symbol's name is a message
to be displayed if the symbol following the warning symbol is ever referenced.
"I"
"i" The symbol is an indirect reference to another symbol (I), a function to be evaluated during
reloc processing (i) or a normal symbol (a space).
"d"
"D" The symbol is a debugging symbol (d) or a dynamic symbol (D) or a normal symbol (a space).
"F"
"f"
"O" The symbol is the name of a function (F) or a file (f) or an object (O) or just a normal symbol
(a space).
-T
--dynamic-syms
Print the dynamic symbol table entries of the file. This is only meaningful for dynamic objects,
such as certain types of shared libraries. This is similar to the information provided by the nm
program when given the -D (--dynamic) option.
--special-syms
When displaying symbols include those which the target considers to be special in some way and which
would not normally be of interest to the user.
-V
--version
Print the version number of objdump and exit.
-x
--all-headers
Display all available header information, including the symbol table and relocation entries. Using
-x is equivalent to specifying all of -a -f -h -p -r -t.
-w
--wide
Format some lines for output devices that have more than 80 columns. Also do not truncate symbol
names when they are displayed.
-z
--disassemble-zeroes
Normally the disassembly output will skip blocks of zeroes. This option directs the disassembler to
disassemble those blocks, just like any other data.
@file
Read command-line options from file. The options read are inserted in place of the original @file
option. If file does not exist, or cannot be read, then the option will be treated literally, and
not removed.
Options in file are separated by whitespace. A whitespace character may be included in an option by
surrounding the entire option in either single or double quotes. Any character (including a
backslash) may be included by prefixing the character to be included with a backslash. The file may
itself contain additional @file options; any such options will be processed recursively.
SEE ALSO
nm(1), readelf(1), and the Info entries for binutils.
COPYRIGHT
Copyright (c) 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005,
2006, 2007, 2008, 2009, 2010 Free Software Foundation, Inc.
Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free
Documentation License, Version 1.3 or any later version published by the Free Software Foundation; with
no Invariant Sections, with no Front-Cover Texts, and with no Back-Cover Texts. A copy of the license is
included in the section entitled "GNU Free Documentation License".
binutils-2.21.1 2011-06-27 OBJDUMP(1)