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 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 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 72int 73rwindow_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