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ppc: BOOK3E: nothing should be done when MSR:PR is set

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The server architecture (BOOK3S) specifies that any instruction that
sets MSR:PR will also set MSR:EE, IR and DR.
However there is no such behavior specification for the embedded
architecture (BOOK3E).

Signed-off-by: Vladimir Svoboda <ze.vlad@gmail.com>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Reviewed-by: Thomas Huth <thuth@redhat.com>
This commit is contained in:
Vladimir Svoboda 2016-11-17 14:49:48 +01:00 committed by David Gibson
parent 62ef3760d4
commit 0d28aa197d
1 changed files with 7 additions and 4 deletions
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11
target-ppc/helper_regs.h
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@ -131,11 +131,14 @@ static inline int hreg_store_msr(CPUPPCState *env, target_ulong value,
}
/* If PR=1 then EE, IR and DR must be 1
*
* Note: We only enforce this on 64-bit processors. It appears that
* 32-bit implementations supports PR=1 and EE/DR/IR=0 and MacOS
* exploits it.
* Note: We only enforce this on 64-bit server processors.
* It appears that:
* - 32-bit implementations supports PR=1 and EE/DR/IR=0 and MacOS
* exploits it.
* - 64-bit embedded implementations do not need any operation to be
* performed when PR is set.
*/
if ((env->insns_flags & PPC_64B) && ((value >> MSR_PR) & 1)) {
if ((env->insns_flags & PPC_SEGMENT_64B) && ((value >> MSR_PR) & 1)) {
value |= (1 << MSR_EE) | (1 << MSR_DR) | (1 << MSR_IR);
}
#endif