1 #include <asm/unistd.h> 2 3 static inline 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 static 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 return status; 21 } 22 23 void _start(void); 24 void _start(void) 25 { 26 write(1, "Hello World\n", 12); 27 exit(0); 28 } 29