how to save gdb command result in a variable and reuse it again inside gdb?

Question

in GDB , i want to save the result of x/x $rsp command , the value inside the address showing

example: the result of the command

 x/x $rsp   is    0xffffaaaa : (0x00400b)

i want to save that address 0x00400b that i highlighted between brackets inside a variable , and reuse that variable that contain 0x00400b inside another GDB command. example dump binary memory from that place when a breakpoint hits.

Andrew · Accepted Answer · 2022-06-20 15:30:31Z

3

You can do what you want like this:

(gdb) x/x $rsp
0x7fffffffb000: 0x004011e0
(gdb) set $foo=*((int*) $rsp)
(gdb) p/x $foo
$2 = 0x4011e0

answered Jun 20, 2022 at 15:30

Andrew

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