rwindow.c revision 88640 
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 88640 2001-12-29 07:32:56Z 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
40ASSERT_EQUAL(sizeof(struct rwindow), 1 << RW_SHIFT);
41ASSERT_EQUAL(sizeof(char *), 1 << PTR_SHIFT);
42
43int
44rwindow_load(struct thread *td, struct trapframe *tf, int n)
45{
46	struct rwindow rw;
47	u_long usp;
48	int error;
49	int i;
50
51	CTR3(KTR_TRAP, "rwindow_load: td=%p (%s) n=%d",
52	    td, td->td_proc->p_comm, n);
53
54	/*
55	 * In case current window is still only on-chip, push it out;
56	 * if it cannot get all the way out, we cannot continue either.
57	 */
58	if ((error = rwindow_save(td)) != 0)
59		return (error);
60	usp = tf->tf_out[6];
61	for (i = 0; i < n; i++) {
62		CTR1(KTR_TRAP, "rwindow_load: usp=%#lx", usp);
63		usp += SPOFF;
64		error = copyin((void *)usp, &rw, sizeof rw);
65		usp = rw.rw_in[6];
66	}
67	CTR1(KTR_TRAP, "rwindow_load: error=%d", error);
68	return (error);
69}
70
71int
72rwindow_save(struct thread *td)
73{
74	struct rwindow *rw;
75	struct pcb *pcb;
76	u_long *ausp;
77	u_long usp;
78	int error;
79	int i;
80
81	pcb = td->td_pcb;
82	CTR3(KTR_TRAP, "rwindow_save: td=%p (%s) nsaved=%d", td,
83	    td->td_proc->p_comm, pcb->pcb_nsaved);
84
85	flushw();
86	if ((i = pcb->pcb_nsaved) == 0)
87		return (0);
88	ausp = pcb->pcb_rwsp;
89	rw = pcb->pcb_rw;
90	error = 0;
91	do {
92		usp = *ausp;
93		CTR1(KTR_TRAP, "rwindow_save: usp=%#lx", usp);
94		usp += SPOFF;
95		error = copyout(rw, (void *)usp, sizeof *rw);
96		if (error)
97			break;
98		ausp++;
99		rw++;
100	} while (--i > 0);
101	CTR1(KTR_TRAP, "rwindow_save: error=%d", error);
102	if (error == 0)
103		pcb->pcb_nsaved = 0;
104	return (error);
105}
106