From bde4e4ee9f90142d550e2684dec2c8df302f5f8e Mon Sep 17 00:00:00 2001
From: "David S. Miller" <davem@davemloft.net>
Date: Mon, 29 Aug 2005 12:44:57 -0700
Subject: [PATCH] [SPARC64]: Do not call winfix_dax blindly
Verify we really are taking a data access exception trap, at TL1, from
one of the window spill/fill handlers.
Else call a new function, data_access_exception_tl1, to log the error.
Signed-off-by: David S. Miller <davem@davemloft.net>
---
arch/sparc64/kernel/entry.S | 16 ++++++++++++++++
arch/sparc64/kernel/traps.c | 11 +++++++++++
2 files changed, 27 insertions(+)
diff --git a/arch/sparc64/kernel/entry.S b/arch/sparc64/kernel/entry.S
index 6d0476ff4ff8..214cd0ebe832 100644
--- a/arch/sparc64/kernel/entry.S
+++ b/arch/sparc64/kernel/entry.S
@@ -701,8 +701,24 @@ __do_data_access_exception_tl1:
ldxa [%g5] ASI_DMMU, %g5 ! Get SFAR
stxa %g0, [%g3] ASI_DMMU ! Clear SFSR.FaultValid bit
membar #Sync
+ rdpr %tt, %g3
+ cmp %g3, 0x80 ! first win spill/fill trap
+ blu,pn %xcc, 1f
+ cmp %g3, 0xff ! last win spill/fill trap
+ bgu,pn %xcc, 1f
+ nop
ba,pt %xcc, winfix_dax
rdpr %tpc, %g3
+1: sethi %hi(109f), %g7
+ ba,pt %xcc, etraptl1
+109: or %g7, %lo(109b), %g7
+ mov %l4, %o1
+ mov %l5, %o2
+ call data_access_exception_tl1
+ add %sp, PTREGS_OFF, %o0
+ ba,pt %xcc, rtrap
+ clr %l6
+
__do_data_access_exception:
rdpr %pstate, %g4
wrpr %g4, PSTATE_MG|PSTATE_AG, %pstate
diff --git a/arch/sparc64/kernel/traps.c b/arch/sparc64/kernel/traps.c
index 0c9e54b2f0c8..210b3e321c29 100644
--- a/arch/sparc64/kernel/traps.c
+++ b/arch/sparc64/kernel/traps.c
@@ -220,6 +220,17 @@ void data_access_exception(struct pt_regs *regs,
force_sig_info(SIGSEGV, &info, current);
}
+void data_access_exception_tl1(struct pt_regs *regs,
+ unsigned long sfsr, unsigned long sfar)
+{
+ if (notify_die(DIE_TRAP_TL1, "data access exception tl1", regs,
+ 0, 0x30, SIGTRAP) == NOTIFY_STOP)
+ return;
+
+ dump_tl1_traplog((struct tl1_traplog *)(regs + 1));
+ data_access_exception(regs, sfsr, sfar);
+}
+
#ifdef CONFIG_PCI
/* This is really pathetic... */
extern volatile int pci_poke_in_progress;
--
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