What does each column of objdump's Symbol table mean?
ObjdumpObjdump Problem Overview
SYMBOL TABLE:
0000000000000000 w *UND* 0000000000000000 __gmon_start__
I've man objdump
but there's no such info.
Anyone know what the 5 columns mean?
Objdump Solutions
Solution 1 - Objdump
COLUMN ONE: the symbol's value
COLUMN TWO: a set of characters and spaces indicating the flag bits that are set on the symbol. There are seven groupings which are listed below:
group one: (l,g,
group two: (w,
group three: (C,
group four: (W,
group five: (I,
group six: (d,D,
group seven: (F,f,O,
COLUMN THREE: the section in which the symbol lives, ABS means not associated with a certain section
COLUMN FOUR: the symbol's size or alignment.
COLUMN FIVE: the symbol's name.
If you want additional information try you man page ;-) or the following links: http://manpages.ubuntu.com/manpages/intrepid/man1/objdump.1.html and http://sourceware.org/binutils/docs/binutils/objdump.html
Solution 2 - Objdump
Since none of the previous answers seem to be correct, here's what you are actually looking for:
Here's a snippet from this link that might help:
"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."
Solution 3 - Objdump
objdump -t prints the symbol table entries of the file.
The output is similar to the information provided by the nm program.
There are 7 columns in the output:
- value
- class
- type
- size
- line
- section
- symbol-name
(some columns may be empty for some entries)
objdump prints the symbol-name in left-most column.
nm prints the symbol-name in the right-most column.
Solution 4 - Objdump
http://www.cs.swarthmore.edu/~newhall/unixhelp/compilecycle.html#runtime
$ nm --format sysv simple # system V format is easier to read than bsd format which is the defaultName Value Class Type Size Line Section
... foo |080484e6| T | FUNC|0000000c| |.text
Solution 5 - Objdump
From description of option -t in man pages of objdump from man7.org, the format is explained as follows: >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.
You can visit above site for a more detail description.