The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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

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    1 /*-
    2  * Copyright (c) 1999 Brian Scott Dean, brdean@unx.sas.com.
    3  *                    All rights reserved.
    4  *
    5  * This code is derived from software contributed to Berkeley by
    6  * Jan-Simon Pendry under the following copyrights and conditions:
    7  *
    8  * Copyright (c) 1993 Jan-Simon Pendry
    9  * Copyright (c) 1993
   10  *      The Regents of the University of California.  All rights reserved.
   11  *
   12  * This code is derived from software contributed to Berkeley by
   13  * Jan-Simon Pendry.
   14  *
   15  * Redistribution and use in source and binary forms, with or without
   16  * modification, are permitted provided that the following conditions
   17  * are met:
   18  * 1. Redistributions of source code must retain the above copyright
   19  *    notice, this list of conditions and the following disclaimer.
   20  * 2. Redistributions in binary form must reproduce the above copyright
   21  *    notice, this list of conditions and the following disclaimer in the
   22  *    documentation and/or other materials provided with the distribution.
   23  * 4. Neither the name of the University nor the names of its contributors
   24  *    may be used to endorse or promote products derived from this software
   25  *    without specific prior written permission.
   26  *
   27  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   28  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   29  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   30  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   31  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   32  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   33  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   34  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   35  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   36  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   37  * SUCH DAMAGE.
   38  *
   39  *      From: @(#)procfs_regs.c 8.4 (Berkeley) 6/15/94
   40  *
   41  * From:
   42  *      $Id: procfs_regs.c,v 3.2 1993/12/15 09:40:17 jsp Exp $
   43  * $FreeBSD: releng/6.4/sys/fs/procfs/procfs_dbregs.c 169951 2007-05-24 16:18:50Z des $
   44  */
   45 
   46 #include "opt_compat.h"
   47 
   48 #include <sys/param.h>
   49 #include <sys/systm.h>
   50 #include <sys/lock.h>
   51 #include <sys/mutex.h>
   52 #include <sys/proc.h>
   53 #include <sys/ptrace.h>
   54 #include <sys/uio.h>
   55 
   56 #include <machine/reg.h>
   57 
   58 #include <fs/pseudofs/pseudofs.h>
   59 #include <fs/procfs/procfs.h>
   60 
   61 #ifdef COMPAT_IA32
   62 #include <sys/procfs.h>
   63 #include <machine/fpu.h>
   64 #include <compat/ia32/ia32_reg.h>
   65 
   66 extern struct sysentvec ia32_freebsd_sysvec;
   67 /*
   68  * PROC(write, dbregs, td2, &r) becomes
   69  * proc_write_dbregs(td2, &r)   or
   70  * proc_write_dbregs32(td2, &r32)
   71  *
   72  * UIOMOVE_FROMBUF(r, uio) becomes
   73  * uiomove_frombuf(&r, sizeof(r), uio)  or
   74  * uiomove_frombuf(&r32, sizeof(r32), uio)
   75  */
   76 #define PROC(d, w, t, r)        wrap32 ? \
   77         proc_ ## d ## _ ## w ## 32(t, r ## 32) : \
   78         proc_ ## d ## _ ## w(t, r)
   79 #define UIOMOVE_FROMBUF(k, u)   wrap32 ? \
   80         uiomove_frombuf(& k ## 32, sizeof(k ## 32), u) : \
   81         uiomove_frombuf(& k, sizeof(k), u)
   82 #else
   83 #define PROC(d, w, t, r)        proc_ ## d ## _ ## w(t, r)
   84 #define UIOMOVE_FROMBUF(k, u)   uiomove_frombuf(& k, sizeof(k), u)
   85 #endif
   86 
   87 int
   88 procfs_doprocdbregs(PFS_FILL_ARGS)
   89 {
   90         int error;
   91         struct dbreg r;
   92         struct thread *td2;
   93 #ifdef COMPAT_IA32
   94         struct dbreg32 r32;
   95         int wrap32 = 0;
   96 #endif
   97 
   98         if (uio->uio_offset != 0)
   99                 return (0);
  100 
  101         PROC_LOCK(p);
  102         KASSERT(p->p_lock > 0, ("proc not held"));
  103         if (p_candebug(td, p) != 0) {
  104                 PROC_UNLOCK(p);
  105                 return (EPERM);
  106         }
  107 
  108         /* XXXKSE: */
  109         td2 = FIRST_THREAD_IN_PROC(p);
  110 #ifdef COMPAT_IA32
  111         if (td->td_proc->p_sysent == &ia32_freebsd_sysvec) {
  112                 if (td2->td_proc->p_sysent != &ia32_freebsd_sysvec) {
  113                         PROC_UNLOCK(p);
  114                         return (EINVAL);
  115                 }
  116                 wrap32 = 1;
  117         }
  118 #endif
  119         error = PROC(read, dbregs, td2, &r);
  120         if (error == 0) {
  121                 PROC_UNLOCK(p);
  122                 error = UIOMOVE_FROMBUF(r, uio);
  123                 PROC_LOCK(p);
  124         }
  125         if (error == 0 && uio->uio_rw == UIO_WRITE) {
  126                 if (!P_SHOULDSTOP(p)) /* XXXKSE should be P_TRACED? */
  127                         error = EBUSY;
  128                 else
  129                         /* XXXKSE: */
  130                         error = PROC(write, dbregs, td2, &r);
  131         }
  132         PROC_UNLOCK(p);
  133 
  134         return (error);
  135 }

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