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| author | Benjamin Herrenschmidt <benh@kernel.crashing.org> | 2012-03-01 04:47:44 (GMT) |
|---|---|---|
| committer | Benjamin Herrenschmidt <benh@kernel.crashing.org> | 2012-03-08 23:55:10 (GMT) |
| commit | 9f2f79e3a3c19ae745d0439d6e0eed31df28de3c (patch) | |
| tree | 0f68f198e3ce6233c5c96d0267de9a73832858a4 /arch/powerpc/kernel/exceptions-64e.S | |
| parent | a546498f3bf9aac311c66f965186373aee2ca0b0 (diff) | |
| download | linux-9f2f79e3a3c19ae745d0439d6e0eed31df28de3c.tar.xz | |
powerpc: Disable interrupts in 64-bit kernel FP and vector faults
If we get a floating point, altivec or vsx unavaible interrupt in
kernel, we trigger a kernel error. There is no point preserving
the interrupt state, in fact, that can even make debugging harder
as the processor state might change (we may even preempt) between
taking the exception and landing in a debugger.
So just make those 3 disable interrupts unconditionally.
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
---
v2: On BookE only disable when hitting the kernel unavailable
path, otherwise it will fail to restore softe as
fast_exception_return doesn't do it.
Diffstat (limited to 'arch/powerpc/kernel/exceptions-64e.S')
| -rw-r--r-- | arch/powerpc/kernel/exceptions-64e.S | 7 |
1 files changed, 3 insertions, 4 deletions
diff --git a/arch/powerpc/kernel/exceptions-64e.S b/arch/powerpc/kernel/exceptions-64e.S index 573613d..3de9993 100644 --- a/arch/powerpc/kernel/exceptions-64e.S +++ b/arch/powerpc/kernel/exceptions-64e.S @@ -354,9 +354,9 @@ interrupt_end_book3e: /* we can probably do a shorter exception entry for that one... */ EXCEPTION_COMMON(0x800, PACA_EXGEN, INTS_KEEP) bne 1f /* if from user, just load it up */ + INTS_DISABLE_ALL bl .save_nvgprs addi r3,r1,STACK_FRAME_OVERHEAD - INTS_RESTORE_HARD bl .kernel_fp_unavailable_exception BUG_OPCODE 1: ld r12,_MSR(r1) @@ -391,10 +391,9 @@ interrupt_end_book3e: /* Auxiliary Processor Unavailable Interrupt */ START_EXCEPTION(ap_unavailable); NORMAL_EXCEPTION_PROLOG(0xf20, PROLOG_ADDITION_NONE) - EXCEPTION_COMMON(0xf20, PACA_EXGEN, INTS_KEEP) - addi r3,r1,STACK_FRAME_OVERHEAD + EXCEPTION_COMMON(0xf20, PACA_EXGEN, INTS_DISABLE_ALL) bl .save_nvgprs - INTS_RESTORE_HARD + addi r3,r1,STACK_FRAME_OVERHEAD bl .unknown_exception b .ret_from_except |