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authorDavid S. Miller <davem@davemloft.net>2009-01-19 22:44:04 -0800
committerDavid S. Miller <davem@davemloft.net>2009-01-19 22:44:04 -0800
commitfcd26f7ae2ea5889134e8b3d60a42ce8b993c95f (patch)
tree1d7928ac2107d4894f7c85483feb0bfb4a43ced0 /arch/sparc/kernel/traps_64.c
parente42650196df34789c825fa83f8bb37a5d5e52c14 (diff)
downloadlinux-linaro-stable-fcd26f7ae2ea5889134e8b3d60a42ce8b993c95f.tar.gz
sparc64: Fix DAX handling via userspace access from kernel.
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>
Diffstat (limited to 'arch/sparc/kernel/traps_64.c')
-rw-r--r--arch/sparc/kernel/traps_64.c17
1 files changed, 16 insertions, 1 deletions
diff --git a/arch/sparc/kernel/traps_64.c b/arch/sparc/kernel/traps_64.c
index c2d153d46586..d809c4ebb48f 100644
--- a/arch/sparc/kernel/traps_64.c
+++ b/arch/sparc/kernel/traps_64.c
@@ -1,6 +1,6 @@
/* 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)
*/
@@ -314,6 +314,21 @@ void sun4v_data_access_exception(struct pt_regs *regs, unsigned long addr, unsig
return;
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] "
"CTX[%04x] TYPE[%04x], going.\n",
addr, ctx, type);