rwindow.c

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    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: releng/5.2/sys/sparc64/sparc64/rwindow.c 105939 2002-10-25 16:00:47Z 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 
   40 CTASSERT((1 << RW_SHIFT) == sizeof(struct rwindow));
   41 
   42 int
   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
   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         if ((i = pcb->pcb_nsaved) == 0)
   88                 return (0);
   89         ausp = pcb->pcb_rwsp;
   90         rw = pcb->pcb_rw;
   91         error = 0;
   92         do {
   93                 usp = *ausp;
   94                 CTR1(KTR_TRAP, "rwindow_save: usp=%#lx", usp);
   95                 usp += SPOFF;
   96                 if ((error = (usp & 0x7)) != 0)
   97                         break;
   98                 error = copyout(rw, (void *)usp, sizeof *rw);
   99                 if (error)
  100                         break;
  101                 ausp++;
  102                 rw++;
  103         } while (--i > 0);
  104         CTR1(KTR_TRAP, "rwindow_save: error=%d", error);
  105         if (error == 0)
  106                 pcb->pcb_nsaved = 0;
  107         return (error == 0 ? 0 : SIGILL);
  108 }

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FreeBSD/Linux Kernel Cross Reference sys/sparc64/sparc64/rwindow.c

FreeBSD/Linux Kernel Cross Reference
sys/sparc64/sparc64/rwindow.c