Update clone syscall for TID and TLS arguments.

arch/alpha/kernel/entry.S

@@ -452,7 +452,8 @@ sys_fork:
 	bsr	$1,do_switch_stack
 	bis	$31,SIGCHLD,$16
 	mov	$31,$17
-	mov	$30,$18
+	mov	$31,$18
+	mov	$30,$19
 	jsr	$26,alpha_clone
 	bsr	$1,undo_switch_stack
 	ret	$31,($26),1
@@ -463,8 +464,9 @@ sys_fork:
 .ent	sys_clone
 sys_clone:
 	bsr	$1,do_switch_stack
-	/* arg1 and arg2 come from the user */
-	mov	$30,$18
+	/* $16, $17, $18, $19 come from the user; $19 is used later
+	   via pt_regs->r19.  */
+	mov	$30,$19
 	jsr	$26,alpha_clone
 	bsr	$1,undo_switch_stack
 	ret	$31,($26),1

arch/alpha/kernel/process.c

@@ -245,11 +245,10 @@ release_thread(struct task_struct *dead_task)
  */
 int
 alpha_clone(unsigned long clone_flags, unsigned long usp,
-	    struct switch_stack * swstack)
+	    int *user_tid, struct switch_stack * swstack)
 {
 	struct task_struct *p;
 	struct pt_regs *u_regs = (struct pt_regs *) (swstack+1);
-	int *user_tid = (int *)u_regs->r19;
 
 	if (!usp)
 		usp = rdusp();
@@ -314,6 +313,10 @@ copy_thread(int nr, unsigned long clone_flags, unsigned long usp,
 	childti->pcb.ksp = (unsigned long) childstack;
 	childti->pcb.flags = 1;	/* set FEN, clear everything else */
 
+	/* Set a new TLS for the child thread?  Peek back into the
+	   syscall arguments that we saved on syscall entry.  */
+	childti->pcb.unique = (clone_flags & CLONE_SETTLS ? regs->r19 : 0);
+
 	return 0;
 }