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[SPARC64]: Do not write garbage into %pstate in tsb_context_switch(). 

For SUN4V, we were clobbering %o5 to do the hypervisor call.
This clobbers the saved %pstate value and we end up writing
garbage into that register as a result.  Oops.

Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David S. Miller 2006-02-15 21:16:42 -08:00
parent de635d833f
commit a7b31bac69
1 changed files with 7 additions and 1 deletions
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8
arch/sparc64/kernel/tsb.S
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@ -265,13 +265,19 @@ __tsb_context_switch:
mov SCRATCHPAD_UTSBREG2, %g1 mov SCRATCHPAD_UTSBREG2, %g1
stxa %g2, [%g1] ASI_SCRATCHPAD stxa %g2, [%g1] ASI_SCRATCHPAD
/* Save away %o5's %pstate, we have to use %o5 for
* the hypervisor call.
*/
mov %o5, %g1
mov HV_FAST_MMU_TSB_CTXNON0, %o5 mov HV_FAST_MMU_TSB_CTXNON0, %o5
mov 1, %o0 mov 1, %o0
mov %o4, %o1 mov %o4, %o1
ta HV_FAST_TRAP ta HV_FAST_TRAP
/* Finish up and restore %o5. */
ba,pt %xcc, 9f ba,pt %xcc, 9f
nop mov %g1, %o5
/* SUN4U TSB switch. */ /* SUN4U TSB switch. */
1: mov TSB_REG, %g1 1: mov TSB_REG, %g1