GDB baby step 3

Give executing permission and start gdb; break at main and run

1. Disassemble main(): disas main

gdb . . 0x0000000000401111 <+11>: mov %rsi,-0x20(%rbp) 0x0000000000401115 <+15>: movl $0x2262c96b,-0x4(%rbp) 0x000000000040111c <+22>: mov -0x4(%rbp),%eax . .

1. Set a breakpoint after movl: break *main+22

2. Examine the bytes: x/4xb $rbp-4