Linker Tools

Viewing Symbols in an Object file with nm(1)

To

Use This

Option

 

 

 

32-bit mode SOM files only: Truncate every name that would otherwise

–T

overflow its column and place an asterisk as the last character in the

 

displayed name to mark it as truncated. If –Aor –ris also specified, the file

 

prefix is truncated first.

 

By default, nm prints the entire name of the symbols listed. Since object files

 

can have symbol names with an arbitrary number of characters, a name that

 

is longer than the width of the column set aside for names overflows its

 

column, forcing every column after the name to be misaligned.

 

 

 

Display undefined symbols only.

–u

 

 

Print the usage menu.

–U

 

 

Sort symbols by value before they are printed.

–v

 

 

Display the executing version of the nm command on standard error.

–V

 

 

Displays the value and size of a symbol in hexadecimal. this is the default

-x

for the -Pformat. Equivalent to -t x.

 

 

 

Examples

Display which object files have undefined references for the symbol “leap”:

"nm –rup *.o grep leap"

Display which object files have a definition for the text symbol “leap”:

nm –rp *.o awk ’{ if\

($3 == " "T" " && $4 == " "leap" ") { print $0 } }’"

To view the symbols defined in an object file, use the nm command. The following 32-bit mode example shows output from running nm -pon the func.o and main.o object files.

$ nm -p func.o

1073741824

d

$THIS_DATA$

Other symbols created from compiling.

 

1073741824

d

$THIS_SHORTDATA$

 

1073741824

b

$THIS_BSS$

 

1073741824

d

$THIS_SHORTBSS$

Global definitions of sum_n.

0000000000

T

sum_n

$ nm -p main.o

Chapter 4

109

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Image 109
Kenwood HP 9000 manual Examples

HP 9000 specifications

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