Get the char* value with python gdb

Asked Jun 27 '23 at 13:50

Active Jun 27 '23 at 15:50

Viewed 35 times

With GDB and Python I tried to get the char* value on x1 register

python
a= gdb.execute("x/s $x1", to_string=True)
print(a)
end

But I got 0xbb4aaa: "SomeString"

I want to get only the SomeString without the address

How can I do that directly with python GDB (without regex/split)

edited Jun 27 '23 at 15:50

asked Jun 27 '23 at 13:50

python3.789

Try `gdb.convenience_variable('x1').string()`. – ssbssa Jun 27 '23 at 15:36
@ssbssa `$x1` is a register ,not a variable . that doesn't work – python3.789 Jun 27 '23 at 15:48
In that case, `gdb.selected_frame().read_register('x1').cast(gdb.lookup_type('char').pointer()).string()`. – ssbssa Jun 27 '23 at 16:43
@ssbssa Wow that crazy command, work, so strange that there is no simple python command for that – python3.789 Jun 27 '23 at 16:51
Not sure what you mean, that's a very specific thing you needed here, why should a 'simple' command exist for exactly that? You can just create your own function if you need this a lot. – ssbssa Jun 27 '23 at 17:14
@ssbssa you can write that as an answer so I will mark that – python3.789 Jun 27 '23 at 19:08
1

Another alternative that's not as efficient, but is compact: `a = gdb.execute('printf "%s", $x1', to_string=True)` – Mark Plotnick Jun 27 '23 at 19:21
@MarkPlotnick write that as an answer please – python3.789 Jun 27 '23 at 21:04

0 Answers0