Skip site navigation (1)Skip section navigation (2)

FreeBSD Manual Pages

  
 
  

home | help
nm(1)				 User Commands				 nm(1)

NAME
       nm - print name list of an object file

SYNOPSIS
       /usr/ccs/bin/nm	[-ACDhlnPprRsTuVv]  [-efox]  [-g  |  -u]   [-t format]
       file...

       /usr/xpg4/bin/nm	[-ACDhlnPprRsTuVv]  [-efox]  [-g  |  -u]   [-t format]
       file...

DESCRIPTION
       The  nm	utility	displays the symbol table of each ELF object file that
       is specified by file.

       If no symbolic information is available for a valid input file, the  nm
       utility will report that	fact, but not consider it an error condition.

OPTIONS
       The output of nm	may be controlled using	the following options:

       -A	       Writes  the full	path name or library name of an	object
		       on each line.

       -C	       Demangles C++ symbol names before printing them out.

       -D	       Displays	the SHT_DYNSYM symbol information. This	is the
		       symbol  table  used  by	ld.so.1	and is present even in
		       stripped	  dynamic   executables.   By	default,   the
		       SHT_SYMTAB symbol table is displayed.

       -e	       See NOTES below.

       -f	       See NOTES below.

       -g	       Writes only external (global) symbol information.

       -h	       Does not	display	the output heading data.

       -l	       Distinguishes   between	WEAK  and  GLOBAL  symbols  by
		       appending a * to	the key	letter for WEAK	symbols.

       -n	       Sorts external symbols by name before they are printed.

       -o	       Prints the value	and size of a symbol in	octal  instead
		       of decimal (equivalent to -t o).

       -p	       Produces	 easy to parse,	terse output. Each symbol name
		       is preceded by its value	(blanks	if undefined) and  one
		       of the letters:

		       A	Absolute symbol.

		       B	bss (uninitialized data	space) symbol.

		       C	COMMON symbol.

		       D	Data object symbol.

		       F	File symbol.

		       N	Symbol has no type.

		       L	Thread-Local storage symbol.

		       S	Section	symbol.

		       T	Text symbol.

		       U	Undefined.

		       If the symbol's binding attribute is:

		       LOCAL	       The key letter is lower case.

		       WEAK	       The key letter is upper case. If	the -l
				       modifier	is specified, the  upper  case
				       key letter is followed by a *

		       GLOBAL	       The key letter is upper case.

       -P	       Writes  information  in	a  portable  output format, as
		       specified in Standard Output.

       -r	       Prepends	the name of the	object file or archive to each
		       output line.

       -R	       Prints  the  archive name (if present), followed	by the
		       object file and symbol name. If the -r option  is  also
		       specified, this option is ignored.

       -s	       Prints section name instead of section index.

       -t format       Writes  each numeric value in the specified format. The
		       format is dependent on the single character used	as the
		       format option-argument:

		       d	The offset is written in decimal (default).

		       o	The offset is written in octal.

		       x	The offset is written in hexadecimal.

       -T	       See NOTES below.

   /usr/ccs/bin/nm
       -u	       Prints undefined	symbols	only.

   /usr/xpg4/bin/nm
       -u	       Prints long listing for each undefined symbol. See OUT-
		       PUT below.

       -v	       Sorts  external	symbols	 by  value  before  they   are
		       printed.

       -V	       Prints  the  version of the nm command executing	on the
		       standard	error output.

       -x	       Prints the value	and size of a  symbol  in  hexadecimal
		       instead of decimal (equivalent to -t x).

       Options	may be used in any order, either singly	or in combination, and
       may appear anywhere in the command line.	When conflicting  options  are
       specified  (such	as -v and -n, or -o and	-x) the	first is taken and the
       second ignored with a warning message to	the user. (See -R  for	excep-
       tion.)

OPERANDS
       The following operand is	supported:

       file	A  path	name of	an object file,	executable file	or object-file
		library.

OUTPUT
       This section describes the nm utility's output options.

   Standard Output
       For each	symbol,	the following information will be printed:

       Index	       The index of the	symbol.	(The index appears  in	brack-
		       ets.)

       Value	       The value of the	symbol is one of the following:

			 o  A section offset for defined symbols in a relocat-
			    able file.

			 o  Alignment constraints for  symbols	whose  section
			    index is SHN_COMMON.

			 o  A	virtual	 address  in  executable  and  dynamic
			    library files.

       Size	       The size	in bytes of the	associated object.

       Type	       A symbol	is of one of the following types:

		       NOTYPE	       No type was specified.

		       OBJECT	       A data object such as an	array or vari-
				       able.

		       FUNC	       A function or other executable code.

		       REGI	       A register symbol (SPARC	only).

		       SECTION	       A section symbol.

		       FILE	       Name of the source file.

		       COMMON	       An uninitialized	common block.

		       TLS	       A variable associated with Thread-Local
				       storage.

       Bind	       The symbol's binding attributes.

		       LOCAL symbols	       Have a  scope  limited  to  the
					       object  file  containing	 their
					       definition.

		       GLOBAL symbols	       Are visible to all object files
					       being combined.

		       WEAK symbols	       Are  essentially	global symbols
					       with a  lower  precedence  than
					       GLOBAL.

       Other	       A symbol's visibility.

		       The  lower  3  bits  of	the  st_other  member  of  the
		       Elf32_Sym structure,  defined in	<sys/elf.h>, are  cur-
		       rently used and can be one of:

		       #define STV_DEFAULT     0
		       #define STV_INTERNAL    1
		       #define STV_HIDDEN      2
		       #define STV_PROTECTED   3

       Shndx	       Except  for  three  special values, this	is the section
		       header table index in relation to which the  symbol  is
		       defined.	The following special values exist:

		       ABS	       Indicates  the  symbol's	value will not
				       change through relocation.

		       COMMON	       Indicates an unallocated	block and  the
				       value provides alignment	constraints.

		       UNDEF	       Indicates an undefined symbol.

       Name	       The name	of the symbol.

       Object Name     The name	of the object or library if -A is specified.

       If  the	-P  option is specified, the previous information is displayed
       using the following portable format. The	three versions differ  depend-
       ing on whether -t d, -t o, or -t	x was specified, respectively:

       "%s%s  %s  %d %d\n", library/object name, name, type, value, size "%s%s
       %s %o %o\n", library/object name, name ,	type, value , size "%s%s %s %x
       %x\n", library/object name, name, type, value, size

       where library/object name is formatted as follows:

	 o  If -A is not specified, library/object name	is an empty string.

	 o  If	-A  is	specified  and the corresponding file operand does not
	    name a library:

	    "%s: ", file

	 o  If -A is specified and the	corresponding  file  operand  names  a
	    library.  In  this	case, object file names	the object file	in the
	    library containing the symbol being	described:

	    "%s[%s]: ",	file, object file

       If -A is	not specified, then if more than one file operand is specified
       or  if  only  one  file operand is specified and	it names a library, nm
       will write a line identifying the object	containing the following  sym-
       bols before the lines containing	those symbols, in the form:

	 o  If the corresponding file operand does not name a library:

	    "%s:\n", file

	 o  If	the  corresponding file	operand	names a	library; in this case,
	    object file	is the name of the file	in the library containing  the
	    following symbols:

	    "%s[%s]:\n", file, object file

       If  -P  is  specified, but -t is	not, the format	is as if -t x had been
       specified.

ENVIRONMENT VARIABLES
       See environ(5) for descriptions of the following	environment  variables
       that  affect  the  execution of nm: LANG, LC_ALL, LC_COLLATE, LC_CTYPE,
       LC_MESSAGES, and	NLSPATH.

EXIT STATUS
       The following exit values are returned:

       0	Successful completion.

       >0	An error occurred.

ATTRIBUTES
       See attributes(5) for descriptions of the following attributes:

/usr/ccs/bin/nm
       +-----------------------------+-----------------------------+
       |      ATTRIBUTE	TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Availability		     |SUNWbtool			   |
       +-----------------------------+-----------------------------+

/usr/xpg4/bin/nm
       +-----------------------------+-----------------------------+
       |      ATTRIBUTE	TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Availability		     |SUNWxcu4			   |
       +-----------------------------+-----------------------------+
       |Interface Stability	     |Standard			   |
       +-----------------------------+-----------------------------+

SEE ALSO
       ar(1),  as(1),  dump(1),	 ld(1),	 ld.so.1(1),  ar.h(3HEAD),   a.out(4),
       attributes(5), environ(5), standards(5)

NOTES
       The  following  options	are  obsolete because of changes to the	object
       file format and will be deleted in a future release.

       -e	Prints only external and static	symbols. The symbol table  now
		contains  only	static and external symbols. Automatic symbols
		no longer appear in the	symbol table. They do  appear  in  the
		debugging information produced by cc -g, which may be examined
		using dump(1).

       -f	Produces full output. Redundant	symbols	(such as .text,	.data,
		and so forth), which existed previously, do not	exist and pro-
		ducing full output will	be identical to	the default output.

       -T	By default, nm prints the entire name of the  symbols  listed.
		Since  symbol  names  have  been moved to the last column, the
		problem	of overflow is removed and it is no  longer  necessary
		to truncate the	symbol name.

SunOS 5.10			  2 Feb	2004				 nm(1)

NAME | SYNOPSIS | DESCRIPTION | OPTIONS | OPERANDS | OUTPUT | ENVIRONMENT VARIABLES | EXIT STATUS | ATTRIBUTES | /usr/ccs/bin/nm | /usr/xpg4/bin/nm | SEE ALSO | NOTES

Want to link to this manual page? Use this URL:
<https://www.freebsd.org/cgi/man.cgi?query=nm&sektion=1&manpath=SunOS+5.10>

home | help