procfs_regs.c

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    1 /*-
    2  * SPDX-License-Identifier: BSD-3-Clause
    3  *
    4  * Copyright (c) 1993 Jan-Simon Pendry
    5  * Copyright (c) 1993
    6  *      The Regents of the University of California.  All rights reserved.
    7  *
    8  * This code is derived from software contributed to Berkeley by
    9  * Jan-Simon Pendry.
   10  *
   11  * Redistribution and use in source and binary forms, with or without
   12  * modification, are permitted provided that the following conditions
   13  * are met:
   14  * 1. Redistributions of source code must retain the above copyright
   15  *    notice, this list of conditions and the following disclaimer.
   16  * 2. Redistributions in binary form must reproduce the above copyright
   17  *    notice, this list of conditions and the following disclaimer in the
   18  *    documentation and/or other materials provided with the distribution.
   19  * 3. Neither the name of the University nor the names of its contributors
   20  *    may be used to endorse or promote products derived from this software
   21  *    without specific prior written permission.
   22  *
   23  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   24  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   25  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   26  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   27  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   28  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   29  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   30  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   31  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   32  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   33  * SUCH DAMAGE.
   34  *
   35  *      @(#)procfs_regs.c       8.4 (Berkeley) 6/15/94
   36  *
   37  * From:
   38  *      $Id: procfs_regs.c,v 3.2 1993/12/15 09:40:17 jsp Exp $
   39  * $FreeBSD$
   40  */
   41 
   42 #include <sys/param.h>
   43 #include <sys/systm.h>
   44 #include <sys/lock.h>
   45 #include <sys/mutex.h>
   46 #include <sys/proc.h>
   47 #include <sys/ptrace.h>
   48 #include <sys/uio.h>
   49 
   50 #include <fs/pseudofs/pseudofs.h>
   51 #include <fs/procfs/procfs.h>
   52 
   53 #ifdef COMPAT_FREEBSD32
   54 #include <sys/procfs.h>
   55 #include <sys/sysent.h>
   56 #include <machine/fpu.h>
   57 
   58 /*
   59  * PROC(write, regs, td2, &r) becomes
   60  * proc_write_regs(td2, &r)   or
   61  * proc_write_regs32(td2, &r32)
   62  *
   63  * UIOMOVE_FROMBUF(r, uio) becomes
   64  * uiomove_frombuf(&r, sizeof(r), uio)  or
   65  * uiomove_frombuf(&r32, sizeof(r32), uio)
   66  */
   67 #define PROC(d, w, t, r)        wrap32 ? \
   68         proc_ ## d ## _ ## w ## 32(t, r ## 32) : \
   69         proc_ ## d ## _ ## w(t, r)
   70 #define UIOMOVE_FROMBUF(k, u)   wrap32 ? \
   71         uiomove_frombuf(& k ## 32, sizeof(k ## 32), u) : \
   72         uiomove_frombuf(& k, sizeof(k), u)
   73 #else
   74 #define PROC(d, w, t, r)        proc_ ## d ## _ ## w(t, r)
   75 #define UIOMOVE_FROMBUF(k, u)   uiomove_frombuf(& k, sizeof(k), u)
   76 #endif
   77 
   78 int
   79 procfs_doprocregs(PFS_FILL_ARGS)
   80 {
   81         int error;
   82         struct reg r;
   83         struct thread *td2;
   84 #ifdef COMPAT_FREEBSD32
   85         struct reg32 r32;
   86         int wrap32 = 0;
   87 #endif
   88 
   89         if (uio->uio_offset != 0)
   90                 return (0);
   91 
   92         PROC_LOCK(p);
   93         PROC_ASSERT_HELD(p);
   94         if (p_candebug(td, p)) {
   95                 PROC_UNLOCK(p);
   96                 return (EPERM);
   97         }
   98         if (!P_SHOULDSTOP(p)) {
   99                 PROC_UNLOCK(p);
  100                 return (EBUSY);
  101         }
  102 
  103         td2 = FIRST_THREAD_IN_PROC(p);
  104 #ifdef COMPAT_FREEBSD32
  105         if (SV_CURPROC_FLAG(SV_ILP32)) {
  106                 if ((SV_PROC_FLAG(td2->td_proc, SV_ILP32)) == 0) {
  107                         PROC_UNLOCK(p);
  108                         return (EINVAL);
  109                 }
  110                 wrap32 = 1;
  111                 memset(&r32, 0, sizeof(r32));
  112         } else
  113 #endif
  114                 memset(&r, 0, sizeof(r));
  115         error = PROC(read, regs, td2, &r);
  116         if (error == 0) {
  117                 PROC_UNLOCK(p);
  118                 error = UIOMOVE_FROMBUF(r, uio);
  119                 PROC_LOCK(p);
  120         }
  121         if (error == 0 && uio->uio_rw == UIO_WRITE) {
  122                 if (!P_SHOULDSTOP(p))
  123                         error = EBUSY;
  124                 else
  125                         /* XXXKSE: */
  126                         error = PROC(write, regs, td2, &r);
  127         }
  128         PROC_UNLOCK(p);
  129 
  130         return (error);
  131 }

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FreeBSD/Linux Kernel Cross Reference sys/fs/procfs/procfs_regs.c

FreeBSD/Linux Kernel Cross Reference
sys/fs/procfs/procfs_regs.c