powerpc/64s: Add exception macro that does not enable RI
Subsequent patches will add more non-RI variant exceptions, so
create a macro for it rather than open-code it.
This does not change generated instructions.
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
diff --git a/arch/powerpc/include/asm/exception-64s.h b/arch/powerpc/include/asm/exception-64s.h
index 8925981..99ed1d8 100644
--- a/arch/powerpc/include/asm/exception-64s.h
+++ b/arch/powerpc/include/asm/exception-64s.h
@@ -200,6 +200,21 @@ END_FTR_SECTION_NESTED(ftr,ftr,943)
#define EXCEPTION_PROLOG_PSERIES_1(label, h) \
__EXCEPTION_PROLOG_PSERIES_1(label, h)
+/* _NORI variant keeps MSR_RI clear */
+#define __EXCEPTION_PROLOG_PSERIES_1_NORI(label, h) \
+ ld r10,PACAKMSR(r13); /* get MSR value for kernel */ \
+ xori r10,r10,MSR_RI; /* Clear MSR_RI */ \
+ mfspr r11,SPRN_##h##SRR0; /* save SRR0 */ \
+ LOAD_HANDLER(r12,label) \
+ mtspr SPRN_##h##SRR0,r12; \
+ mfspr r12,SPRN_##h##SRR1; /* and SRR1 */ \
+ mtspr SPRN_##h##SRR1,r10; \
+ h##rfid; \
+ b . /* prevent speculative execution */
+
+#define EXCEPTION_PROLOG_PSERIES_1_NORI(label, h) \
+ __EXCEPTION_PROLOG_PSERIES_1_NORI(label, h)
+
#define EXCEPTION_PROLOG_PSERIES(area, label, h, extra, vec) \
EXCEPTION_PROLOG_0(area); \
EXCEPTION_PROLOG_1(area, extra, vec); \