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//
// user-level startup routine
//
.text
.globl _start
.globl main
.globl exit
// entry point - this is where the kernel starts us running
_start:
// we immediately call main()
call main
// if we come back from that, it means the user
// program didn't call exit(), in which case the
// value returned from main() is the exit status
// push that value onto the stack and call exit()
subl $12, %esp
pushl %eax
call exit
// if we come back from that, something bad has
// happened, so we just lock up
1: jmp 1b
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