arm64: add local_daif_inherit()
Some synchronous exceptions can be taken from a number of contexts, e.g. where IRQs may or may not be masked. In the entry assembly for these exceptions, we use the inherit_daif assembly macro to ensure that we only mask those exceptions which were masked when the exception was taken. So that we can do the same from C code, this patch adds a new local_daif_inherit() function, following the existing local_daif_*() naming scheme. Signed-off-by: Mark Rutland <mark.rutland@arm.com> [moved away from local_daif_restore()] Signed-off-by: James Morse <james.morse@arm.com> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
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@ -9,6 +9,7 @@
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#include <asm/arch_gicv3.h>
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#include <asm/cpufeature.h>
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#include <asm/ptrace.h>
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#define DAIF_PROCCTX 0
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#define DAIF_PROCCTX_NOIRQ PSR_I_BIT
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@ -109,4 +110,19 @@ static inline void local_daif_restore(unsigned long flags)
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trace_hardirqs_off();
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}
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/*
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* Called by synchronous exception handlers to restore the DAIF bits that were
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* modified by taking an exception.
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*/
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static inline void local_daif_inherit(struct pt_regs *regs)
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{
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unsigned long flags = regs->pstate & DAIF_MASK;
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/*
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* We can't use local_daif_restore(regs->pstate) here as
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* system_has_prio_mask_debugging() won't restore the I bit if it can
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* use the pmr instead.
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*/
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write_sysreg(flags, daif);
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}
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#endif
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