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sparc64: Reschedule KGDB capture to a software interrupt.

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Otherwise it might interrupt switch_to() midstream and use
half-cooked register window state.

Reported-by: Chris Torek <chris.torek@windriver.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David S. Miller
2009-03-18 23:51:57 -07:00
parent 1c339eb183
commit 42cc77c861
4 changed files with 10 additions and 24 deletions
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24
arch/sparc/mm/ultra.S
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@@ -679,28 +679,8 @@ xcall_new_mmu_context_version:
#ifdef CONFIG_KGDB
.globl xcall_kgdb_capture
xcall_kgdb_capture:
661: rdpr %pstate, %g2
wrpr %g2, PSTATE_IG | PSTATE_AG, %pstate
.section .sun4v_2insn_patch, "ax"
.word 661b
nop
nop
.previous
rdpr %pil, %g2
wrpr %g0, PIL_NORMAL_MAX, %pil
sethi %hi(109f), %g7
ba,pt %xcc, etrap_irq
109: or %g7, %lo(109b), %g7
#ifdef CONFIG_TRACE_IRQFLAGS
call trace_hardirqs_off
nop
#endif
call smp_kgdb_capture_client
add %sp, PTREGS_OFF, %o0
/* Has to be a non-v9 branch due to the large distance. */
ba rtrap_xcall
ldx [%sp + PTREGS_OFF + PT_V9_TSTATE], %l1
wr %g0, (1 << PIL_KGDB_CAPTURE), %set_softint
retry
#endif
#endif /* CONFIG_SMP */