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sparc64: Prevent stack backtrace false positives on trap frames.
author
David S. Miller
<davem@davemloft.net>
Thu, 22 May 2008 04:50:01 +0000
(21:50 -0700)
committer
David S. Miller
<davem@davemloft.net>
Thu, 22 May 2008 04:50:01 +0000
(21:50 -0700)
When we fully commit to returning back to kernel mode from
a trap, zero out the regs->magic value to prevent false
positives during stack backtraces.
Signed-off-by: David S. Miller <davem@davemloft.net>
arch/sparc64/kernel/rtrap.S
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diff --git
a/arch/sparc64/kernel/rtrap.S
b/arch/sparc64/kernel/rtrap.S
index 3afacbb5781da9c7405093073f70335ea2193222..c6fc695fe1fe79fb7c695a3d2f51069e031c10b5 100644
(file)
--- a/
arch/sparc64/kernel/rtrap.S
+++ b/
arch/sparc64/kernel/rtrap.S
@@
-363,6
+363,7
@@
kern_rtt: rdpr %canrestore, %g1
brz,pn %g1, kern_rtt_fill
nop
kern_rtt_restore:
+ stw %g0, [%sp + PTREGS_OFF + PT_V9_MAGIC]
restore
retry