Merge branch 'x86-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git...

[linux-2.6-omap-h63xx.git] / arch / sparc / kernel / traps_64.c

diff --git a/arch/sparc/kernel/traps_64.c b/arch/sparc/kernel/traps_64.c
index bca3b4e09c41bd5c1edef9e3c18e0cb7a37bf6cc..d809c4ebb48f44120f682272e00664bfbfd7cea6 100644 (file)
--- 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)
  */
 
@@ -128,6 +128,7 @@ void do_BUG(const char *file, int line)
        bust_spinlocks(1);
        printk("kernel BUG at %s:%d!\n", file, line);
 }
+EXPORT_SYMBOL(do_BUG);
 #endif
 
 static DEFINE_SPINLOCK(dimm_handler_lock);
@@ -313,6 +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);
@@ -2261,6 +2277,7 @@ void die_if_kernel(char *str, struct pt_regs *regs)
                do_exit(SIGKILL);
        do_exit(SIGSEGV);
 }
+EXPORT_SYMBOL(die_if_kernel);
 
 #define VIS_OPCODE_MASK        ((0x3 << 30) | (0x3f << 19))
 #define VIS_OPCODE_VAL ((0x2 << 30) | (0x36 << 19))