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| author | Benjamin Herrenschmidt <benh@kernel.crashing.org> | 2012-03-01 15:47:44 +1100 |
|---|---|---|
| committer | Benjamin Herrenschmidt <benh@kernel.crashing.org> | 2012-03-09 10:55:10 +1100 |
| commit | 9f2f79e3a3c19ae745d0439d6e0eed31df28de3c (patch) | |
| tree | 0f68f198e3ce6233c5c96d0267de9a73832858a4 /arch/powerpc/kernel/exceptions-64s.S | |
| parent | a546498f3bf9aac311c66f965186373aee2ca0b0 (diff) | |
| download | blackbird-op-linux-9f2f79e3a3c19ae745d0439d6e0eed31df28de3c.tar.gz blackbird-op-linux-9f2f79e3a3c19ae745d0439d6e0eed31df28de3c.zip | |
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-64s.S')
| -rw-r--r-- | arch/powerpc/kernel/exceptions-64s.S | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/arch/powerpc/kernel/exceptions-64s.S b/arch/powerpc/kernel/exceptions-64s.S index d8ff6d37fc4d..0fb42ae21694 100644 --- a/arch/powerpc/kernel/exceptions-64s.S +++ b/arch/powerpc/kernel/exceptions-64s.S @@ -762,8 +762,8 @@ fp_unavailable_common: EXCEPTION_PROLOG_COMMON(0x800, PACA_EXGEN) bne 1f /* if from user, just load it up */ bl .save_nvgprs + DISABLE_INTS addi r3,r1,STACK_FRAME_OVERHEAD - ENABLE_INTS bl .kernel_fp_unavailable_exception BUG_OPCODE 1: bl .load_up_fpu @@ -782,8 +782,8 @@ BEGIN_FTR_SECTION END_FTR_SECTION_IFSET(CPU_FTR_ALTIVEC) #endif bl .save_nvgprs + DISABLE_INTS addi r3,r1,STACK_FRAME_OVERHEAD - ENABLE_INTS bl .altivec_unavailable_exception b .ret_from_except @@ -798,8 +798,8 @@ BEGIN_FTR_SECTION END_FTR_SECTION_IFSET(CPU_FTR_VSX) #endif bl .save_nvgprs + DISABLE_INTS addi r3,r1,STACK_FRAME_OVERHEAD - ENABLE_INTS bl .vsx_unavailable_exception b .ret_from_except |
