qemu/tests/hello.c

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#include <asm/unistd.h>
extern inline volatile void exit(int status)
{
int __res;
__asm__ volatile ("movl %%ecx,%%ebx\n"\
"int $0x80" \
: "=a" (__res) : "0" (__NR_exit),"c" ((long)(status)));
}
extern inline int write(int fd, const char * buf, int len)
{
int status;
__asm__ volatile ("pushl %%ebx\n"\
"movl %%esi,%%ebx\n"\
"int $0x80\n" \
"popl %%ebx\n"\
: "=a" (status) \
: "0" (__NR_write),"S" ((long)(fd)),"c" ((long)(buf)),"d" ((long)(len)));
}
void _start(void)
{
write(1, "Hello World\n", 12);
exit(0);
}