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 _startup(void) 23 { 24 write(1, "Hello World\n", 12); 25 exit(0); 26 } 27