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| author | Nicholas Piggin <npiggin@gmail.com> | 2016-12-20 04:30:02 +1000 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2017-04-28 21:02:25 +1000 |
| commit | 83a980f7f4769c0673f0f966350d1db26993a193 (patch) | |
| tree | 4e47191ce9cd9dcab291a61357f04ebd4c9e0442 /arch/powerpc | |
| parent | 6e83985b0f6e30b928eee26eb41d276814a698aa (diff) | |
| download | linux-83a980f7f4769c0673f0f966350d1db26993a193.tar.gz linux-83a980f7f4769c0673f0f966350d1db26993a193.tar.bz2 linux-83a980f7f4769c0673f0f966350d1db26993a193.zip | |
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>
Diffstat (limited to 'arch/powerpc')
| -rw-r--r-- | arch/powerpc/include/asm/exception-64s.h | 15 | ||||
| -rw-r--r-- | arch/powerpc/kernel/exceptions-64s.S | 17 |
2 files changed, 19 insertions, 13 deletions
diff --git a/arch/powerpc/include/asm/exception-64s.h b/arch/powerpc/include/asm/exception-64s.h index 89259817f5ef..99ed1d811684 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); \ diff --git a/arch/powerpc/kernel/exceptions-64s.S b/arch/powerpc/kernel/exceptions-64s.S index 28f8d7bed6b1..aa65e3cd4875 100644 --- a/arch/powerpc/kernel/exceptions-64s.S +++ b/arch/powerpc/kernel/exceptions-64s.S @@ -240,20 +240,11 @@ machine_check_fwnmi: machine_check_pSeries_0: EXCEPTION_PROLOG_1(PACA_EXMC, KVMTEST_PR, 0x200) /* - * The following is essentially EXCEPTION_PROLOG_PSERIES_1 with the - * difference that MSR_RI is not enabled, because PACA_EXMC is being - * used, so nested machine check corrupts it. machine_check_common - * enables MSR_RI. + * MSR_RI is not enabled, because PACA_EXMC is being used, so a + * nested machine check corrupts it. machine_check_common enables + * MSR_RI. */ - ld r10,PACAKMSR(r13) - xori r10,r10,MSR_RI - mfspr r11,SPRN_SRR0 - LOAD_HANDLER(r12, machine_check_common) - mtspr SPRN_SRR0,r12 - mfspr r12,SPRN_SRR1 - mtspr SPRN_SRR1,r10 - rfid - b . /* prevent speculative execution */ + EXCEPTION_PROLOG_PSERIES_1_NORI(machine_check_common, EXC_STD) TRAMP_KVM_SKIP(PACA_EXMC, 0x200) |