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powerpc/kprobes: Do not disable External interrupts during single step
External/Decrement exceptions have lower priority than the Debug Exception. So, we don't have to disable the External interrupts before a single step. However, on BookE, Critical Input Exception(CE) has higher priority than a Debug Exception. Hence we mask them. Signed-off-by: Suzuki K. Poulose <suzuki@in.ibm.com> Cc: Sebastian Andrzej Siewior <bigeasy@linutronix.de> Cc: Ananth N Mavinakaynahalli <ananth@in.ibm.com> Cc: Kumar Gala <galak@kernel.crashing.org> Cc: linuxppc-dev@ozlabs.org Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
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@ -104,13 +104,13 @@ void __kprobes arch_remove_kprobe(struct kprobe *p)
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static void __kprobes prepare_singlestep(struct kprobe *p, struct pt_regs *regs)
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{
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/* We turn off async exceptions to ensure that the single step will
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* be for the instruction we have the kprobe on, if we dont its
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* possible we'd get the single step reported for an exception handler
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* like Decrementer or External Interrupt */
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regs->msr &= ~MSR_EE;
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regs->msr |= MSR_SINGLESTEP;
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#ifdef CONFIG_PPC_ADV_DEBUG_REGS
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/*
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* We turn off Critical Input Exception(CE) to ensure that the single
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* step will be for the instruction we have the probe on; if we don't,
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* it is possible we'd get the single step reported for CE.
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*/
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regs->msr &= ~MSR_CE;
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mtspr(SPRN_DBCR0, mfspr(SPRN_DBCR0) | DBCR0_IC | DBCR0_IDM);
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#ifdef CONFIG_PPC_47x
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