pls explain strcpy() assembly

[Rajaram Suryanarayanan <rajaram_linux@xxxxxxxxx>]

Hi,

Can anybody pls explain me step by step what is done by the assembly code below ? Particularly, I want to know how "src" and "dest" get substituted in the assembly code.

 static inline char * strcpy(char * dest,const char *src)
{
int d0, d1, d2;
__asm__ __volatile__(
        "1:\tlodsb\n\t"
        "stosb\n\t"
        "testb %%al,%%al\n\t"
        "jne 1b"
        : "=&S" (d0), "=&D" (d1), "=&a" (d2)
        :"0" (src),"1" (dest) : "memory");
return dest;
}

Thanks,
Rajaram.

---

Yahoo! Photos ? Showcase holiday pictures in hardcover
 
Photo Books. You design it and we?ll bind it!