debugging on x86_64

call_main

0x00007ffff780ccae in __libc_start_main () from /lib64/libc.so.6
10: /x $eax = 0xf7b7ef60
9: /x $ecx = 0x0
8: /x $edx = 0xffffe658
7: /x $ebx = 0x400e90                                                             # <- main address
6: /x $esi = 0xffffe648
5: /x $edi = 0x1
2: /t $ps = 1000000110
1: x/4i $pc
=> 0x7ffff780ccae <__libc_start_main+142>:      callq  *%rbx                      # call main
   0x7ffff780ccb0 <__libc_start_main+144>:      mov    0x36f1d9(%rip),%rax        # 0x7ffff7b7be90
   0x7ffff780ccb7 <__libc_start_main+151>:      mov    0x110(%rax),%ebx
   0x7ffff780ccbd <__libc_start_main+157>:      test   %ebx,%ebx