shell3_64_debugging1

[howard@sterling shellcodes]$ gdb -q bin/shell3_64 
Reading symbols from bin/shell3_64...(no debugging symbols found)...done.
(gdb) r
Starting program: /home/howard/repos/bof/shellcodes/bin/shell3_64 

Program received signal SIGSEGV, Segmentation fault.
0x0000000000400088 in system_call ()
(gdb) disas system_call
Dump of assembler code for function system_call:
   0x000000000040007e <+0>:    mov    (%rsp),%r8
   0x0000000000400082 <+4>:    xor    %r9,%r9
   0x0000000000400085 <+7>:    mov    $0x41,%r9b
=> 0x0000000000400088 <+10>:    xor    %r9b,0x7(%r8)
   0x000000000040008c <+14>:    mov    %r8,%rdi
   0x000000000040008f <+17>:    mov    0x8(%rsp),%r8
   0x0000000000400094 <+22>:    xor    %r9,0x2(%r8)
   0x0000000000400098 <+26>:    mov    %rsp,%rsi
   0x000000000040009b <+29>:    xor    %rdx,%rdx
   0x000000000040009e <+32>:    xor    %rax,%rax
   0x00000000004000a1 <+35>:    mov    $0x3b,%al
   0x00000000004000a3 <+37>:    syscall 
End of assembler dump.