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[SPARC64]: Refine register window trap handling.

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When saving and restoing trap state, do the window spill/fill
handling inline so that we never trap deeper than 2 trap levels.
This is important for chips like Niagara.

The window fixup code is massively simplified, and many more
improvements are now possible.

Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David S. Miller
2006-02-04 00:10:01 -08:00
parent ffe483d552
commit 314ef68597
7 changed files with 455 additions and 448 deletions
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arch/sparc64/kernel/tsb.S
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@@ -115,7 +115,6 @@ sparc64_realfault_common:
ba,pt %xcc, rtrap_clr_l6 ! Restore cpu state
nop ! Delay slot (fill me)
.globl winfix_trampoline
winfix_trampoline:
rdpr %tpc, %g3 ! Prepare winfixup TNPC
or %g3, 0x7c, %g3 ! Compute branch offset