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sparc64: Set %l4 properly on trap return after handling signals. 

If we did some signal processing, we have to reload the pt_regs
tstate register because it's value may have changed.

In doing so we also have to extract the %pil value contained in there
anre load that into %l4.

This value is at bit 20 and thus needs to be shifted down before we
later write it into the %pil register.

Most of the time this is harmless as we are returning to userspace
and the %pil is zero for that case.

Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David S. Miller 2018-10-14 20:22:28 -07:00
parent b3e1eb8e7a
commit d1f1f98c6d
1 changed files with 2 additions and 1 deletions
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3
arch/sparc/kernel/rtrap_64.S
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@ -84,8 +84,9 @@ __handle_signal:
ldx [%sp + PTREGS_OFF + PT_V9_TSTATE], %l1 ldx [%sp + PTREGS_OFF + PT_V9_TSTATE], %l1
sethi %hi(0xf << 20), %l4 sethi %hi(0xf << 20), %l4
and %l1, %l4, %l4 and %l1, %l4, %l4
andn %l1, %l4, %l1
ba,pt %xcc, __handle_preemption_continue ba,pt %xcc, __handle_preemption_continue
andn %l1, %l4, %l1 srl %l4, 20, %l4
/* When returning from a NMI (%pil==15) interrupt we want to /* When returning from a NMI (%pil==15) interrupt we want to
* avoid running softirqs, doing IRQ tracing, preempting, etc. * avoid running softirqs, doing IRQ tracing, preempting, etc.