OSDev.org

Hi !

I know what you've been doing wrong
while fixing asm clobbers in linux 0.0.1.

For example:
__asm__(
    "cld;rep;movsl"
    ::"S"(src),"D"(dst),"c"(count)
    :"si","di","cx");

should be converted to

int d0,d1,d2;
__asm__ __volatile__(
    "cld;rep;movsl"
    :"=&c"(d0),"=&D"(d1),"=&S"(d2)
    :"0"(count),"1"(dst),"2"(src));

instead of simple removing clobbers,
because GCC simply thinks that these
registers are not touched and uses
them to optimize code by not loading
variables again.

Best regards
Jarek Pelczar

>I know what you've been doing wrong while fixing asm clobbers in linux 0.0.1.

Over a year ago, I gave up trying to make it work. I made a small Minix partition on the hard drive of my old PC for it. It would boot, but I couldn't find a small, statically-linked shell for it to run.

If you do get it to work, I bet the people on the Linux kernel mailing list would be interested.