rwindow.c revision 91336 
1/*-
2 * Copyright (c) 1997 Berkeley Software Design, Inc. All rights reserved.
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
6 * are met:
7 * 1. Redistributions of source code must retain the above copyright
8 *    notice, this list of conditions and the following disclaimer.
9 * 2. Redistributions in binary form must reproduce the above copyright
10 *    notice, this list of conditions and the following disclaimer in the
11 *    documentation and/or other materials provided with the distribution.
12 * 3. Berkeley Software Design Inc's name may not be used to endorse or
13 *    promote products derived from this software without specific prior
14 *    written permission.
15 *
16 * THIS SOFTWARE IS PROVIDED BY BERKELEY SOFTWARE DESIGN INC ``AS IS'' AND
17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED.  IN NO EVENT SHALL BERKELEY SOFTWARE DESIGN INC BE LIABLE
20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 *
28 *	from: BSDI: trap.c,v 1.17.2.9 1999/10/19 15:29:52 cp Exp
29 * $FreeBSD: head/sys/sparc64/sparc64/rwindow.c 91336 2002-02-27 00:21:04Z jake $
30 */
31
32#include <sys/param.h>
33#include <sys/systm.h>
34#include <sys/ktr.h>
35#include <sys/proc.h>
36#include <sys/user.h>
37
38#include <machine/frame.h>
39
40CTASSERT((1 << RW_SHIFT) == sizeof(struct rwindow));
41
42int
43rwindow_load(struct thread *td, struct trapframe *tf, int n)
44{
45	struct rwindow rw;
46	u_long usp;
47	int error;
48	int i;
49
50	CTR3(KTR_TRAP, "rwindow_load: td=%p (%s) n=%d",
51	    td, td->td_proc->p_comm, n);
52
53	/*
54	 * In case current window is still only on-chip, push it out;
55	 * if it cannot get all the way out, we cannot continue either.
56	 */
57	if ((error = rwindow_save(td)) != 0)
58		return (error);
59	usp = tf->tf_out[6];
60	for (i = 0; i < n; i++) {
61		CTR1(KTR_TRAP, "rwindow_load: usp=%#lx", usp);
62		usp += SPOFF;
63		error = copyin((void *)usp, &rw, sizeof rw);
64		usp = rw.rw_in[6];
65	}
66	CTR1(KTR_TRAP, "rwindow_load: error=%d", error);
67	return (error);
68}
69
70int
71rwindow_save(struct thread *td)
72{
73	struct rwindow *rw;
74	struct pcb *pcb;
75	u_long *ausp;
76	u_long usp;
77	int error;
78	int i;
79
80	pcb = td->td_pcb;
81	CTR3(KTR_TRAP, "rwindow_save: td=%p (%s) nsaved=%d", td,
82	    td->td_proc->p_comm, pcb->pcb_nsaved);
83
84	flushw();
85	if ((i = pcb->pcb_nsaved) == 0)
86		return (0);
87	ausp = pcb->pcb_rwsp;
88	rw = pcb->pcb_rw;
89	error = 0;
90	do {
91		usp = *ausp;
92		CTR1(KTR_TRAP, "rwindow_save: usp=%#lx", usp);
93		usp += SPOFF;
94		error = copyout(rw, (void *)usp, sizeof *rw);
95		if (error)
96			break;
97		ausp++;
98		rw++;
99	} while (--i > 0);
100	CTR1(KTR_TRAP, "rwindow_save: error=%d", error);
101	if (error == 0)
102		pcb->pcb_nsaved = 0;
103	return (error);
104}
105