added the got command to show fastly the state of the GOT table

[degrigis]

Added the command "got" used to retrieve fastly the state of the GOT table. It works for 32 and 64 binaries and also for PIE programs.

Example 64 bit - PIE OFF :

Example 64 bit - PIE ON:

Example 32 bit:

[anthraxx]

This looks awesome, I did some tests and looks cool... just noticed a small detail: under certain binaries i don't get any symbols printed for the GOT entries. for example with my version of nmap i don't get any symbols explaining the pointers:

gdb-peda$ got
[...]
0x768570:   0x0042c386  0x00000000

however when i run readelf:

> readelf -r /usr/bin/nmap|grep 768570  
000000768570  00a600000007 R_X86_64_JUMP_SLO 0000000000000000 sleep@GLIBC_2.2.5 + 0

What do you think about not just relying on gdb and therefor purely relying on the x/wx command issued in line 4521: https://github.com/longld/peda/pull/79/commits/ea2d69558e0449f9be53752b4a8b725f5f4b6f01#diff-c1c917467ee788f52846b75c797b9eb0R4521 or 4516: https://github.com/longld/peda/pull/79/commits/ea2d69558e0449f9be53752b4a8b725f5f4b6f01#diff-c1c917467ee788f52846b75c797b9eb0R4516 but also propagate the readelf value contained in the f_line variable from line 4512: https://github.com/longld/peda/pull/79/commits/ea2d69558e0449f9be53752b4a8b725f5f4b6f01#diff-c1c917467ee788f52846b75c797b9eb0R4512. This way we could always output some useful information about the got/plt entry even when gdb does not provide anything for the x/wx command.

This would always be rock solid when we don't get useful additions by GDB and could look somewhat like:

gdb-peda$ got
[...]
0x768570:   0x0042c386  0x00000000  sleep@GLIBC_2.2.5

[anthraxx]

It would be cool if you can apply this patch in addition to yours to achieve the previous mentioned printing of the name: https://github.com/anthraxx/peda/commit/aa63d4fa076036e8e735079a6bc8bb89cbd6ae06

Additionally there is a warning_msg function from the utils file to print warnings, please also update the pull request by changing those two warnings like:

https://github.com/anthraxx/peda/commit/7fb48563826724c0a896db34b72bf14ecaea31e5

[degrigis]

Ok, I've got time to improve a little bit the output of the commands following your advice @anthraxx.

The situation now is the following:

I've re-used the information inside the f_line for the name and filtered a little bit the output from x/wx for both 32 and 64 bits to extract the addresses.