_start program for demonstration purposes

_start.c

   0x0000000000400450 <+0>:	xor    %ebp,%ebp
   0x0000000000400452 <+2>:	mov    %rdx,%r9
   0x0000000000400455 <+5>:	pop    %rsi
   0x0000000000400456 <+6>:	mov    %rsp,%rdx
   0x0000000000400459 <+9>:	and    $0xfffffffffffffff0,%rsp
   0x000000000040045d <+13>:	push   %rax
   0x000000000040045e <+14>:	push   %rsp
   0x000000000040045f <+15>:	mov    $0x4005e0,%r8
   0x0000000000400466 <+22>:	mov    $0x400570,%rcx
   0x000000000040046d <+29>:	mov    $0x400430,%rdi
   0x0000000000400474 <+36>:	callq  0x400410 <__libc_start_main@plt>
   0x0000000000400479 <+41>:	hlt