[PATCH] ppc32: fix SPE state corruption on e500

Unfortunately the restoring of SPE state was causing data corruption
since we were restoring based on the size of the altivec context and not
the SPE context.  Also, fixed setting of last_task_used_spe on
start_thread, flush_thread, and exit_thread. 
Signed-off-by: Kumar Gala <kumar.gala@freescale.com>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

arch/ppc/kernel/process.c

@@ -321,7 +321,7 @@ void show_regs(struct pt_regs * regs)
 	trap = TRAP(regs);
 	if (trap == 0x300 || trap == 0x600)
 		printk("DAR: %08lX, DSISR: %08lX\n", regs->dar, regs->dsisr);
-	printk("TASK = %p[%d] '%s' THREAD: %p",
+	printk("TASK = %p[%d] '%s' THREAD: %p\n",
 	       current, current->pid, current->comm, current->thread_info);
 	printk("Last syscall: %ld ", current->thread.last_syscall);
 
@@ -370,6 +370,10 @@ void exit_thread(void)
 		last_task_used_math = NULL;
 	if (last_task_used_altivec == current)
 		last_task_used_altivec = NULL;
+#ifdef CONFIG_SPE
+	if (last_task_used_spe == current)
+		last_task_used_spe = NULL;
+#endif
 }
 
 void flush_thread(void)
@@ -378,6 +382,10 @@ void flush_thread(void)
 		last_task_used_math = NULL;
 	if (last_task_used_altivec == current)
 		last_task_used_altivec = NULL;
+#ifdef CONFIG_SPE
+	if (last_task_used_spe == current)
+		last_task_used_spe = NULL;
+#endif
 }
 
 void
@@ -480,6 +488,10 @@ void start_thread(struct pt_regs *regs, unsigned long nip, unsigned long sp)
 		last_task_used_math = NULL;
 	if (last_task_used_altivec == current)
 		last_task_used_altivec = NULL;
+#ifdef CONFIG_SPE
+	if (last_task_used_spe == current)
+		last_task_used_spe = NULL;
+#endif
 	memset(current->thread.fpr, 0, sizeof(current->thread.fpr));
 	current->thread.fpscr = 0;
 #ifdef CONFIG_ALTIVEC

arch/ppc/kernel/signal.c

@@ -319,7 +319,7 @@ restore_user_regs(struct pt_regs *regs, struct mcontext __user *sr, int sig)
 	if (!__get_user(msr, &sr->mc_gregs[PT_MSR]) && (msr & MSR_SPE) != 0) {
 		/* restore spe registers from the stack */
 		if (__copy_from_user(current->thread.evr, &sr->mc_vregs,
-				     sizeof(sr->mc_vregs)))
+				     ELF_NEVRREG * sizeof(u32)))
 			return 1;
 	} else if (current->thread.used_spe)
 		memset(&current->thread.evr, 0, ELF_NEVRREG * sizeof(u32));