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sparc64: Fix DAX handling via userspace access from kernel.

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If we do a userspace access from kernel mode, and get a
data access exception, we need to check the exception
table just like a normal fault does.

The spitfire DAX handler was doing this, but such logic
was missing from the sun4v DAX code.

Reported-by: Dennis Gilmore <dgilmore@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David S. Miller
2009-01-19 22:44:04 -08:00
parent e42650196d
commit fcd26f7ae2
1 changed files with 16 additions and 1 deletions
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17
arch/sparc/kernel/traps_64.c
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@@ -1,6 +1,6 @@
/* arch/sparc64/kernel/traps.c /* arch/sparc64/kernel/traps.c
* *
* Copyright (C) 1995,1997,2008 David S. Miller (davem@davemloft.net) * Copyright (C) 1995,1997,2008,2009 David S. Miller (davem@davemloft.net)
* Copyright (C) 1997,1999,2000 Jakub Jelinek (jakub@redhat.com) * Copyright (C) 1997,1999,2000 Jakub Jelinek (jakub@redhat.com)
*/ */
@@ -314,6 +314,21 @@ void sun4v_data_access_exception(struct pt_regs *regs, unsigned long addr, unsig
return; return;
if (regs->tstate & TSTATE_PRIV) { if (regs->tstate & TSTATE_PRIV) {
/* Test if this comes from uaccess places. */
const struct exception_table_entry *entry;
entry = search_exception_tables(regs->tpc);
if (entry) {
/* Ouch, somebody is trying VM hole tricks on us... */
#ifdef DEBUG_EXCEPTIONS
printk("Exception: PC<%016lx> faddr<UNKNOWN>\n", regs->tpc);
printk("EX_TABLE: insn<%016lx> fixup<%016lx>\n",
regs->tpc, entry->fixup);
#endif
regs->tpc = entry->fixup;
regs->tnpc = regs->tpc + 4;
return;
}
printk("sun4v_data_access_exception: ADDR[%016lx] " printk("sun4v_data_access_exception: ADDR[%016lx] "
"CTX[%04x] TYPE[%04x], going.\n", "CTX[%04x] TYPE[%04x], going.\n",
addr, ctx, type); addr, ctx, type);