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| author |   Nicholas Piggin <npiggin@gmail.com> | 2019-08-02 20:56:32 +1000 |
|---|---|---|
| committer |   Michael Ellerman <mpe@ellerman.id.au> | 2019-08-30 10:32:34 +1000 |
| commit | 0b66370c61fcf5fcc1d6901013e110284da6e2bb (patch) | |
| tree | 4afed0e1cd9cd878eee11975e2fa3a9b3f3686db /arch/powerpc/kernel/exceptions-64s.S | |
| parent | powerpc/64s/exception: machine check remove machine_check_pSeries_0 branch (diff) | |
| download | linux-dev-0b66370c61fcf5fcc1d6901013e110284da6e2bb.tar.xz linux-dev-0b66370c61fcf5fcc1d6901013e110284da6e2bb.zip | |
powerpc/64s/exception: machine check use correct cfar for late handler
Bare metal machine checks run an "early" handler in real mode before
running the main handler which reports the event.
The main handler runs exactly as a normal interrupt handler, after the
"windup" which sets registers back as they were at interrupt entry.
CFAR does not get restored by the windup code, so that will be wrong
when the handler is run.
Restore the CFAR to the saved value before running the late handler.
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20190802105709.27696-8-npiggin@gmail.com
Diffstat (limited to 'arch/powerpc/kernel/exceptions-64s.S')
| -rw-r--r-- | arch/powerpc/kernel/exceptions-64s.S | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/arch/powerpc/kernel/exceptions-64s.S b/arch/powerpc/kernel/exceptions-64s.S index 577d93a83d05..b7c4149cb91c 100644 --- a/arch/powerpc/kernel/exceptions-64s.S +++ b/arch/powerpc/kernel/exceptions-64s.S @@ -1186,6 +1186,10 @@ FTR_SECTION_ELSE ALT_FTR_SECTION_END_IFSET(CPU_FTR_HVMODE) 9: /* Deliver the machine check to host kernel in V mode. */ +BEGIN_FTR_SECTION + ld r10,ORIG_GPR3(r1) + mtspr SPRN_CFAR,r10 +END_FTR_SECTION_IFSET(CPU_FTR_CFAR) MACHINE_CHECK_HANDLER_WINDUP EXCEPTION_PROLOG_0 PACA_EXMC EXCEPTION_PROLOG_1 EXC_STD, PACA_EXMC, 1, 0x200, 1, 1, 0 |