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.\" ========================================================================

.\"

.IX Title "NM 1"

.TH NM 1 "2009-10-16" "binutils-2.20" "GNU Development Tools"

.\" For nroff, turn off justification.  Always turn off hyphenation; it makes

.\" way too many mistakes in technical documents.

.if n .ad l

.nh

.SH "NAME"

nm \- list symbols from object files

.SH "SYNOPSIS"

.IX Header "SYNOPSIS"

nm [\fB\-a\fR|\fB\-\-debug\-syms\fR]

   [\fB\-g\fR|\fB\-\-extern\-only\fR][\fB\-\-plugin\fR \fIname\fR]

   [\fB\-B\fR] [\fB\-C\fR|\fB\-\-demangle\fR[=\fIstyle\fR]] [\fB\-D\fR|\fB\-\-dynamic\fR]

   [\fB\-S\fR|\fB\-\-print\-size\fR] [\fB\-s\fR|\fB\-\-print\-armap\fR]

   [\fB\-A\fR|\fB\-o\fR|\fB\-\-print\-file\-name\fR][\fB\-\-special\-syms\fR]

   [\fB\-n\fR|\fB\-v\fR|\fB\-\-numeric\-sort\fR] [\fB\-p\fR|\fB\-\-no\-sort\fR]

   [\fB\-r\fR|\fB\-\-reverse\-sort\fR] [\fB\-\-size\-sort\fR] [\fB\-u\fR|\fB\-\-undefined\-only\fR]

   [\fB\-t\fR \fIradix\fR|\fB\-\-radix=\fR\fIradix\fR] [\fB\-P\fR|\fB\-\-portability\fR]

   [\fB\-\-target=\fR\fIbfdname\fR] [\fB\-f\fR\fIformat\fR|\fB\-\-format=\fR\fIformat\fR]

   [\fB\-\-defined\-only\fR] [\fB\-l\fR|\fB\-\-line\-numbers\fR] [\fB\-\-no\-demangle\fR]

   [\fB\-V\fR|\fB\-\-version\fR] [\fB\-X 32_64\fR] [\fB\-\-help\fR]  [\fIobjfile\fR...]

.SH "DESCRIPTION"

.IX Header "DESCRIPTION"

\&\s-1GNU\s0 \fBnm\fR lists the symbols from object files \fIobjfile\fR....

If no object files are listed as arguments, \fBnm\fR assumes the file

\&\fIa.out\fR.

.PP

For each symbol, \fBnm\fR shows:

.IP "\(bu" 4

The symbol value, in the radix selected by options (see below), or

hexadecimal by default.

.IP "\(bu" 4

The symbol type.  At least the following types are used; others are, as

well, depending on the object file format.  If lowercase, the symbol is

local; if uppercase, the symbol is global (external).

.RS 4

.ie n .IP """A""" 4

.el .IP "\f(CWA\fR" 4

.IX Item "A"

The symbol's value is absolute, and will not be changed by further

linking.

.ie n .IP """B""" 4

.el .IP "\f(CWB\fR" 4

.IX Item "B"

.PD 0

.ie n .IP """b""" 4

.el .IP "\f(CWb\fR" 4

.IX Item "b"

.PD

The symbol is in the uninitialized data section (known as \s-1BSS\s0).

.ie n .IP """C""" 4

.el .IP "\f(CWC\fR" 4

.IX Item "C"

The symbol is common.  Common symbols are uninitialized data.  When

linking, multiple common symbols may appear with the same name.  If the

symbol is defined anywhere, the common symbols are treated as undefined

references.

.ie n .IP """D""" 4

.el .IP "\f(CWD\fR" 4

.IX Item "D"

.PD 0

.ie n .IP """d""" 4

.el .IP "\f(CWd\fR" 4

.IX Item "d"

.PD

The symbol is in the initialized data section.

.ie n .IP """G""" 4

.el .IP "\f(CWG\fR" 4

.IX Item "G"

.PD 0

.ie n .IP """g""" 4

.el .IP "\f(CWg\fR" 4

.IX Item "g"

.PD

The symbol is in an initialized data section for small objects.  Some

object file formats permit more efficient access to small data objects,

such as a global int variable as opposed to a large global array.

.ie n .IP """i""" 4

.el .IP "\f(CWi\fR" 4

.IX Item "i"

For \s-1PE\s0 format files this indicates that the symbol is in a section

specific to the implementation of DLLs.  For \s-1ELF\s0 format files this

indicates that the symbol is an indirect function.  This is a \s-1GNU\s0

extension to the standard set of \s-1ELF\s0 symbol types.  It indicates a

symbol which if referenced by a relocation does not evaluate to its

address, but instead must be invoked at runtime.  The runtime

execution will then return the value to be used in the relocation.

.ie n .IP """N""" 4

.el .IP "\f(CWN\fR" 4

.IX Item "N"

The symbol is a debugging symbol.

.ie n .IP """p""" 4

.el .IP "\f(CWp\fR" 4

.IX Item "p"

The symbols is in a stack unwind section.

.ie n .IP """R""" 4

.el .IP "\f(CWR\fR" 4

.IX Item "R"

.PD 0

.ie n .IP """r""" 4

.el .IP "\f(CWr\fR" 4

.IX Item "r"

.PD

The symbol is in a read only data section.

.ie n .IP """S""" 4

.el .IP "\f(CWS\fR" 4

.IX Item "S"

.PD 0

.ie n .IP """s""" 4

.el .IP "\f(CWs\fR" 4

.IX Item "s"

.PD

The symbol is in an uninitialized data section for small objects.

.ie n .IP """T""" 4

.el .IP "\f(CWT\fR" 4

.IX Item "T"

.PD 0

.ie n .IP """t""" 4

.el .IP "\f(CWt\fR" 4

.IX Item "t"

.PD

The symbol is in the text (code) section.

.ie n .IP """U""" 4

.el .IP "\f(CWU\fR" 4

.IX Item "U"

The symbol is undefined.

.ie n .IP """u""" 4

.el .IP "\f(CWu\fR" 4

.IX Item "u"

The symbol is a unique global symbol.  This is a \s-1GNU\s0 extension to the

standard set of \s-1ELF\s0 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.

.ie n .IP """V""" 4

.el .IP "\f(CWV\fR" 4

.IX Item "V"

.PD 0

.ie n .IP """v""" 4

.el .IP "\f(CWv\fR" 4

.IX Item "v"

.PD

The symbol is a weak object.  When a weak defined symbol is linked with

a normal defined symbol, the normal defined symbol is used with no error.

When a weak undefined symbol is linked and the symbol is not defined,

the value of the weak symbol becomes zero with no error.  On some

systems, uppercase indicates that a default value has been specified.

.ie n .IP """W""" 4

.el .IP "\f(CWW\fR" 4

.IX Item "W"

.PD 0

.ie n .IP """w""" 4

.el .IP "\f(CWw\fR" 4

.IX Item "w"

.PD

The symbol is a weak symbol that has not been specifically tagged as a

weak object symbol.  When a weak defined symbol is linked with a normal

defined symbol, the normal defined symbol is used with no error.

When a weak undefined symbol is linked and the symbol is not defined,

the value of the symbol is determined in a system-specific manner without

error.  On some systems, uppercase indicates that a default value has been

specified.

.ie n .IP """\-""" 4

.el .IP "\f(CW\-\fR" 4

.IX Item "-"

The symbol is a stabs symbol in an a.out object file.  In this case, the

next values printed are the stabs other field, the stabs desc field, and

the stab type.  Stabs symbols are used to hold debugging information.

.ie n .IP """?""" 4

.el .IP "\f(CW?\fR" 4

.IX Item "?"

The symbol type is unknown, or object file format specific.

.RE

.RS 4

.RE

.IP "\(bu" 4

The symbol name.

.SH "OPTIONS"

.IX Header "OPTIONS"

The long and short forms of options, shown here as alternatives, are

equivalent.

.IP "\fB\-A\fR" 4

.IX Item "-A"

.PD 0

.IP "\fB\-o\fR" 4

.IX Item "-o"

.IP "\fB\-\-print\-file\-name\fR" 4

.IX Item "--print-file-name"

.PD

Precede each symbol by the name of the input file (or archive member)

in which it was found, rather than identifying the input file once only,

before all of its symbols.

.IP "\fB\-a\fR" 4

.IX Item "-a"

.PD 0

.IP "\fB\-\-debug\-syms\fR" 4

.IX Item "--debug-syms"

.PD

Display all symbols, even debugger-only symbols; normally these are not

listed.

.IP "\fB\-B\fR" 4

.IX Item "-B"

The same as \fB\-\-format=bsd\fR (for compatibility with the \s-1MIPS\s0 \fBnm\fR).

.IP "\fB\-C\fR" 4

.IX Item "-C"

.PD 0

.IP "\fB\-\-demangle[=\fR\fIstyle\fR\fB]\fR" 4

.IX Item "--demangle[=style]"

.PD

Decode (\fIdemangle\fR) 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.

.IP "\fB\-\-no\-demangle\fR" 4

.IX Item "--no-demangle"

Do not demangle low-level symbol names.  This is the default.

.IP "\fB\-D\fR" 4

.IX Item "-D"

.PD 0

.IP "\fB\-\-dynamic\fR" 4

.IX Item "--dynamic"

.PD

Display the dynamic symbols rather than the normal symbols.  This is

only meaningful for dynamic objects, such as certain types of shared

libraries.

.IP "\fB\-f\fR \fIformat\fR" 4

.IX Item "-f format"

.PD 0

.IP "\fB\-\-format=\fR\fIformat\fR" 4

.IX Item "--format=format"

.PD

Use the output format \fIformat\fR, which can be \f(CW\*(C`bsd\*(C'\fR,

\&\f(CW\*(C`sysv\*(C'\fR, or \f(CW\*(C`posix\*(C'\fR.  The default is \f(CW\*(C`bsd\*(C'\fR.

Only the first character of \fIformat\fR is significant; it can be

either upper or lower case.

.IP "\fB\-g\fR" 4

.IX Item "-g"

.PD 0

.IP "\fB\-\-extern\-only\fR" 4

.IX Item "--extern-only"

.PD

Display only external symbols.

.IP "\fB\-\-plugin\fR \fIname\fR" 4

.IX Item "--plugin name"

Load the plugin called \fIname\fR to add support for extra target

types.  This option is only available if the toolchain has been built

with plugin support enabled.

.IP "\fB\-l\fR" 4

.IX Item "-l"

.PD 0

.IP "\fB\-\-line\-numbers\fR" 4

.IX Item "--line-numbers"

.PD

For each symbol, use debugging information to try to find a filename and

line number.  For a defined symbol, look for the line number of the

address of the symbol.  For an undefined symbol, look for the line

number of a relocation entry which refers to the symbol.  If line number

information can be found, print it after the other symbol information.

.IP "\fB\-n\fR" 4

.IX Item "-n"

.PD 0

.IP "\fB\-v\fR" 4

.IX Item "-v"

.IP "\fB\-\-numeric\-sort\fR" 4

.IX Item "--numeric-sort"

.PD

Sort symbols numerically by their addresses, rather than alphabetically

by their names.

.IP "\fB\-p\fR" 4

.IX Item "-p"

.PD 0

.IP "\fB\-\-no\-sort\fR" 4

.IX Item "--no-sort"

.PD

Do not bother to sort the symbols in any order; print them in the order

encountered.

.IP "\fB\-P\fR" 4

.IX Item "-P"

.PD 0

.IP "\fB\-\-portability\fR" 4

.IX Item "--portability"

.PD

Use the \s-1POSIX\s0.2 standard output format instead of the default format.

Equivalent to \fB\-f posix\fR.

.IP "\fB\-S\fR" 4

.IX Item "-S"

.PD 0

.IP "\fB\-\-print\-size\fR" 4

.IX Item "--print-size"

.PD

Print both value and size of defined symbols for the \f(CW\*(C`bsd\*(C'\fR output style.

This option has no effect for object formats that do not record symbol

sizes, unless \fB\-\-size\-sort\fR is also used in which case a

calculated size is displayed.

.IP "\fB\-s\fR" 4

.IX Item "-s"

.PD 0

.IP "\fB\-\-print\-armap\fR" 4

.IX Item "--print-armap"

.PD

When listing symbols from archive members, include the index: a mapping

(stored in the archive by \fBar\fR or \fBranlib\fR) of which modules

contain definitions for which names.

.IP "\fB\-r\fR" 4

.IX Item "-r"

.PD 0

.IP "\fB\-\-reverse\-sort\fR" 4

.IX Item "--reverse-sort"

.PD

Reverse the order of the sort (whether numeric or alphabetic); let the

last come first.

.IP "\fB\-\-size\-sort\fR" 4

.IX Item "--size-sort"

Sort symbols by size.  The size is computed as the difference between

the value of the symbol and the value of the symbol with the next higher

value.  If the \f(CW\*(C`bsd\*(C'\fR output format is used the size of the symbol

is printed, rather than the value, and \fB\-S\fR must be used in order

both size and value to be printed.

.IP "\fB\-\-special\-syms\fR" 4

.IX Item "--special-syms"

Display symbols which have a target-specific special meaning.  These

symbols are usually used by the target for some special processing and

are not normally helpful when included included in the normal symbol

lists.  For example for \s-1ARM\s0 targets this option would skip the mapping

symbols used to mark transitions between \s-1ARM\s0 code, \s-1THUMB\s0 code and

data.

.IP "\fB\-t\fR \fIradix\fR" 4

.IX Item "-t radix"

.PD 0

.IP "\fB\-\-radix=\fR\fIradix\fR" 4

.IX Item "--radix=radix"

.PD

Use \fIradix\fR as the radix for printing the symbol values.  It must be

\&\fBd\fR for decimal, \fBo\fR for octal, or \fBx\fR for hexadecimal.

.IP "\fB\-\-target=\fR\fIbfdname\fR" 4

.IX Item "--target=bfdname"

Specify an object code format other than your system's default format.

.IP "\fB\-u\fR" 4

.IX Item "-u"

.PD 0

.IP "\fB\-\-undefined\-only\fR" 4

.IX Item "--undefined-only"

.PD

Display only undefined symbols (those external to each object file).

.IP "\fB\-\-defined\-only\fR" 4

.IX Item "--defined-only"

Display only defined symbols for each object file.

.IP "\fB\-V\fR" 4

.IX Item "-V"

.PD 0

.IP "\fB\-\-version\fR" 4

.IX Item "--version"

.PD

Show the version number of \fBnm\fR and exit.

.IP "\fB\-X\fR" 4

.IX Item "-X"

This option is ignored for compatibility with the \s-1AIX\s0 version of

\&\fBnm\fR.  It takes one parameter which must be the string

\&\fB32_64\fR.  The default mode of \s-1AIX\s0 \fBnm\fR corresponds

to \fB\-X 32\fR, which is not supported by \s-1GNU\s0 \fBnm\fR.

.IP "\fB\-\-help\fR" 4

.IX Item "--help"

Show a summary of the options to \fBnm\fR and exit.

.IP "\fB@\fR\fIfile\fR" 4

.IX Item "@file"

Read command-line options from \fIfile\fR.  The options read are

inserted in place of the original @\fIfile\fR option.  If \fIfile\fR

does not exist, or cannot be read, then the option will be treated

literally, and not removed.

.Sp

Options in \fIfile\fR 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 \fIfile\fR may itself contain additional

@\fIfile\fR options; any such options will be processed recursively.

.SH "SEE ALSO"

.IX Header "SEE ALSO"

\&\fIar\fR\|(1), \fIobjdump\fR\|(1), \fIranlib\fR\|(1), and the Info entries for \fIbinutils\fR.

.SH "COPYRIGHT"

.IX Header "COPYRIGHT"

Copyright (c) 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999,

2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009 Free Software Foundation, Inc.

.PP

Permission is granted to copy, distribute and/or modify this document

under the terms of the \s-1GNU\s0 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 \*(L"\s-1GNU\s0 Free Documentation License\*(R".