On 01/07/16 07:41, David Gibson wrote:
> From: Benjamin Herrenschmidt <b378bb0948277d71c78bc6d0c1ef80a253aafc80>
>
> The architecture specifies that any instruction that sets MSR:PR will also
> set MSR:EE, IR and DR.
>
> Signed-off-by: Benjamin Herrenschmidt <b...@kernel.crashing.org>
> Signed-off-by: Cédric Le Goater <c...@kaod.org>
> Signed-off-by: David Gibson <da...@gibson.dropbear.id.au>
> ---
> target-ppc/helper_regs.h | 4 ++++
> 1 file changed, 4 insertions(+)
>
> diff --git a/target-ppc/helper_regs.h b/target-ppc/helper_regs.h
> index 8fc0934..8fdfa5c 100644
> --- a/target-ppc/helper_regs.h
> +++ b/target-ppc/helper_regs.h
> @@ -136,6 +136,10 @@ static inline int hreg_store_msr(CPUPPCState *env,
> target_ulong value,
> /* Change the exception prefix on PowerPC 601 */
> env->excp_prefix = ((value >> MSR_EP) & 1) * 0xFFF00000;
> }
> + /* If PR=1 then EE, IR and DR must be 1 */
> + if ((value >> MSR_PR) & 1) {
> + value |= (1 << MSR_EE) | (1 << MSR_DR) | (1 << MSR_IR);
> + }
> #endif
> env->msr = value;
> hreg_compute_hflags(env);
>
Unfortunately this patch causes a regression and breaks booting OS 9 and
OS X under qemu-system-ppc.
ATB,
Mark.
