/**
 * @file crt0.S
 * @brief C runtime startup for user-mode applications.
 *
 * Calls the C main() function and then exits with the return value.
 */
.section .text
.global _start
.extern main

_start:
    /* Call main() */
    call main

    /* Exit with main's return value (in EAX) */
    movl %eax, %ebx     /* exit code = return value */
    movl $0, %eax        /* SYS_EXIT = 0 */
    int $0x80

    /* Should never reach here */
1:  jmp 1b