Read memory

Reading memory:

(gdb) x 0x20001234
0x20001234:     0xabababab

https://stackoverflow.com/questions/29528732/gdb-print-all-values-in-char-array

(gdb) list
1   int main(void) {
2       char * p = "hello\0world\0hahaha";
3       return 0;
4   }
5   
(gdb) b 3
Breakpoint 1 at 0x4004b8: file str.c, line 3.
(gdb) run
Starting program: /home/paul/src/sandbox/str 

Breakpoint 1, main () at str.c:3
3       return 0;
(gdb) print p
$1 = 0x40056c "hello"
(gdb) x/19bc p
0x40056c:   104 'h' 101 'e' 108 'l' 108 'l' 111 'o' 0 '\000'    119 'w' 111 'o'
0x400574:   114 'r' 108 'l' 100 'd' 0 '\000'    104 'h' 97 'a'  104 'h' 97 'a'
0x40057c:   104 'h' 97 'a'  0 '\000'

https://stackoverflow.com/questions/29528732/gdb-print-all-values-in-char-array

With gdb, you can achieve to print the elements of your array using the following command:

(gdb) print *array@size

https://jvns.ca/blog/2014/02/10/three-steps-to-learning-gdb/

From looking at that assembly above, it seems like 0x40060c might be the address of the string we’re printing. Let’s check!

(gdb) x/s 0x40060c
0x40060c:        "Hi!"

It is! Neat! Look at that. The /s part of x/s means “show it to me like it’s a string”. I could also have said “show me 10 characters” like this:

(gdb) x/10c 0x40060c
0x40060c:       72 'H'  105 'i' 33 '!'  0 '\000'        1 '\001'        27 '\033'       3 '\003'        59 ';'
0x400614:       52 '4'  0 '\000'

You can see that the first four characters are ‘H’, ‘i’, and ‘!’, and ‘\0’ and then after that there’s more unrelated stuff.