amd64/bareMetalOS-0.5.3/newlib/baremetal/crt0.s

   1 .global _start
   2 .extern main
   3 _start:
   4
   5 ## here you might want to get the argc/argv pairs somehow and then push
   6 ## them onto the stack...
   7
   8 # call the user's function
   9 call main
  10
  11 # return to the OS
  12 ret