[POWERPC] Make instruction dumping work in real mode

On non-book-E, exceptions execute in real mode. If a fault happens
that leads to a register dump, the kernel currently prints XXXXXXXX
because it doesn't realize that PC is a physical address.

This patch checks whether instruction address translation is turned
on, and if not converts PC into a virtual address.

Signed-off-by: Scott Wood <[e-mail]>
Acked-by: Kumar Gala <[e-mail]>
Acked-by: Olof Johansson <[e-mail]>
Signed-off-by: Paul Mackerras <[e-mail]>

arch/powerpc/kernel/process.c

···
 		if (!(i % 8))
 			printk("\n");
 
+#if !defined(CONFIG_BOOKE)
+		/* If executing with the IMMU off, adjust pc rather
+		 * than print XXXXXXXX.
+		 */
+		if (!(regs->msr & MSR_IR))
+			pc = (unsigned long)phys_to_virt(pc);
+#endif
+
 		/* We use __get_user here *only* to avoid an OOPS on a
 		 * bad address because the pc *should* only be a
 		 * kernel address.