[parisc-linux] 720 - some progress

[Matthew Wilcox]

On Thu, Sep 27, 2001 at 10:42:25AM -0400, Jurij Smakov wrote:
> I hope I've got it right. It only emulates MFCTL and only when the
> source control register is 27. It turns out, that pt_regs does not
> have a member for cr26 and adding one does not look like an easy
> task. 

I think the right way to do this would be...

> @@ -363,6 +364,17 @@
>                 si.si_code = ILL_PRVOPC;
>                 goto give_sigill;
>         case 11:
> +               if(!(regs->iir & 0xfc000000) && (((regs->iir & 0x1fe0)>>5) == 0x45)) {
> +                 /* This is MFCTL instruction */
> +                 fromcr = (regs->iir & 0x03e00000)>>21;
> +                 togr = (regs->iir & 0x1f);
> +                 /* Emulate the instruction if the read is from cr27 */

		if (fromcr == 26 || fromcr == 27) {
			regs->gr[togr] = mfctl(fromcr);
			return;
		}

> +               }
> +               /* Something else is wrong */
>                 die_if_kernel("Privileged register - shouldn't happen!", regs, code);
>                 si.si_code = ILL_PRVREG;
>         give_sigill:

Can you give this a try?

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