GDB - jump - 17.2 Continuing at a Different Address

jump顧名思義就是跳到某一行開始執行, 而且是會立刻執行直到遇到breakpoint. 因為jump並不會對stack, memory, 或register有任何改變(除了PC/program counter), 也因此jump的範圍需要在同一個function內部, 避免crash.
你也可以用set $pc=<execute_address> + "continue", "next", "step"替代

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(gdb) set listsize unlimited
(gdb) list
1       #include <stdio.h>
2
3       static void possible_crash_1(void)
4       {
5           printf("%s(#%d)\n", __FUNCTION__, __LINE__);
6       }
7
8       static void possible_crash_2(void)
9       {
10          printf("%s(#%d)\n", __FUNCTION__, __LINE__);
11      }
12
13      static void possible_crash_3(void)
14      {
15          printf("%s(#%d)\n", __FUNCTION__, __LINE__);
16      }
17
18      int main(int argc, char *argv[])
19      {
20          possible_crash_1();
21
22          possible_crash_2();
23
24          possible_crash_3();
25
26          return 0;
27      }
28
(gdb) b main
Breakpoint 1 at 0x400576: file jump.c, line 20.
(gdb) run
Starting program: /build/brook/a.out

Breakpoint 1, main (argc=1, argv=0x7fffffffe4e8) at jump.c:20
20          possible_crash_1();
(gdb) j 22
Continuing at 0x40057b.
possible_crash_2(#10)
possible_crash_3(#15)
[Inferior 1 (process 9816) exited normally]
(gdb) run
Starting program: /build/brook/a.out

Breakpoint 1, main (argc=1, argv=0x7fffffffe4e8) at jump.c:20
20          possible_crash_1();
(gdb) set $pc=0x40057b
(gdb) n
possible_crash_2(#10)
24          possible_crash_3();
(gdb) n
possible_crash_3(#15)
26          return 0;

參考資料:

https://sourceware.org/gdb/download/onlinedocs/gdb/Jumping.html#Jumping, 17.2 Continuing at a Different Address