1 #include <asm/unistd.h>

     2 

     3 extern inline volatile void exit(int status)

     4 {

     5   int __res;

     6   __asm__ volatile ("movl %%ecx,%%ebx\n"\

     7 		    "int $0x80" \

     8 		    :  "=a" (__res) : "0" (__NR_exit),"c" ((long)(status)));

     9 }

    10 

    11 extern inline int write(int fd, const char * buf, int len)

    12 {

    13   int status;

    14   __asm__ volatile ("pushl %%ebx\n"\

    15 		    "movl %%esi,%%ebx\n"\

    16 		    "int $0x80\n" \

    17 		    "popl %%ebx\n"\

    18 		    : "=a" (status) \

    19 		    : "0" (__NR_write),"S" ((long)(fd)),"c" ((long)(buf)),"d" ((long)(len)));

    20 }

    21 

    22 void _start(void)

    23 {

    24     write(1, "Hello World\n", 12);

    25     exit(0);

    26 }