Re: [parisc-linux] fic problem

[Matthew Wilcox <willy@debian.org>]

On Fri, Dec 13, 2002 at 04:27:13AM -0800, FARINATI,LEANDRO (HP-Brazil,ex1) wrote:
>                 __asm__ __volatile__("fdc (%0)" :: "r" (spot) );
>                 __asm__ __volatile__("sync" ::);
>                 __asm__ __volatile__("fic (%0)" :: "r" (spot) );
> (segmentation fault in this line)
>                 __asm__ __volatile__("sync" ::);

don't do it like this.  do it this way:

		__asm__ __volatile__("\n\
			fdc (%0)\n\
			sync\n\
			fic (%0)\n\
			sync\n"
			: : "r" (spot)
		);

that ensures that these 4 insns really are together.  you might want to
look at the generated assembly output for this function (objdump -dr
foo.o |less) and/or recompile the kernel with PRINT_USER_TRAPS turned
on so you get a register dump so you can debug this yourself.

-- 
"It's not Hollywood.  War is real, war is primarily not about defeat or
victory, it is about death.  I've seen thousands and thousands of dead bodies.
Do you think I want to have an academic debate on this subject?" -- Robert Fisk