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 * $FreeBSD$
30 */
31
32 #include <sys/param.h>
33 #include <sys/systm.h>
34 #include <sys/ktr.h>
35 #include <sys/proc.h>
36
37 #include <machine/frame.h>
38 #include <machine/pcb.h>
39
40 CTASSERT((1 << RW_SHIFT) == sizeof(struct rwindow));
41
42 int
rwindow_load(struct thread * td,struct trapframe * tf,int n)43 rwindow_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 if ((error = (usp & 0x7)) != 0)
64 break;
65 error = copyin((void *)usp, &rw, sizeof rw);
66 usp = rw.rw_in[6];
67 }
68 CTR1(KTR_TRAP, "rwindow_load: error=%d", error);
69 return (error == 0 ? 0 : SIGILL);
70 }
71
72 int
rwindow_save(struct thread * td)73 rwindow_save(struct thread *td)
74 {
75 struct rwindow *rw;
76 struct pcb *pcb;
77 u_long *ausp;
78 u_long usp;
79 int error;
80 int i;
81
82 pcb = td->td_pcb;
83 CTR3(KTR_TRAP, "rwindow_save: td=%p (%s) nsaved=%d", td,
84 td->td_proc->p_comm, pcb->pcb_nsaved);
85
86 flushw();
87 KASSERT(pcb->pcb_nsaved < MAXWIN,
88 ("rwindow_save: pcb_nsaved > MAXWIN"));
89 if ((i = pcb->pcb_nsaved) == 0)
90 return (0);
91 ausp = pcb->pcb_rwsp;
92 rw = pcb->pcb_rw;
93 error = 0;
94 do {
95 usp = *ausp;
96 CTR1(KTR_TRAP, "rwindow_save: usp=%#lx", usp);
97 usp += SPOFF;
98 if ((error = (usp & 0x7)) != 0)
99 break;
100 error = copyout(rw, (void *)usp, sizeof *rw);
101 if (error)
102 break;
103 ausp++;
104 rw++;
105 } while (--i > 0);
106 CTR1(KTR_TRAP, "rwindow_save: error=%d", error);
107 if (error == 0)
108 pcb->pcb_nsaved = 0;
109 return (error == 0 ? 0 : SIGILL);
110 }
111