diff options
| author | David S. Miller <davem@davemloft.net> | 2009-01-19 22:56:51 -0800 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2009-03-16 17:52:42 -0700 |
| commit | b9a94094113f73585f651143113c0c2478ebf34e (patch) | |
| tree | a2174ce71832ddc71c7de44154594cdc17cbccbe /arch | |
| parent | 21ef40e66f6186898ea4240b83a0f1c7424953d0 (diff) | |
sparc64: Fix DAX handling via userspace access from kernel.
[ Upstream commit fcd26f7ae2ea5889134e8b3d60a42ce8b993c95f ]
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>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/sparc64/kernel/traps.c | 17 |
1 files changed, 16 insertions, 1 deletions
diff --git a/arch/sparc64/kernel/traps.c b/arch/sparc64/kernel/traps.c index c824df13f589..eb197240fa06 100644 --- a/arch/sparc64/kernel/traps.c +++ b/arch/sparc64/kernel/traps.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) */ @@ -262,6 +262,21 @@ 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); |