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

     /*-
      * SPDX-License-Identifier: BSD-3-Clause
      *
      * Copyright (c) 1999 Brian Scott Dean, brdean@unx.sas.com.
      *                    All rights reserved.
      *
      * This code is derived from software contributed to Berkeley by
      * Jan-Simon Pendry under the following copyrights and conditions:
      *
     * Copyright (c) 1993 Jan-Simon Pendry
     * Copyright (c) 1993
     *      The Regents of the University of California.  All rights reserved.
     *
     * This code is derived from software contributed to Berkeley by
     * Jan-Simon Pendry.
     *
     * Redistribution and use in source and binary forms, with or without
     * modification, are permitted provided that the following conditions
     * are met:
     * 1. Redistributions of source code must retain the above copyright
     *    notice, this list of conditions and the following disclaimer.
     * 2. Redistributions in binary form must reproduce the above copyright
     *    notice, this list of conditions and the following disclaimer in the
     *    documentation and/or other materials provided with the distribution.
     * 3. Neither the name of the University nor the names of its contributors
     *    may be used to endorse or promote products derived from this software
     *    without specific prior written permission.
     *
     * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     * SUCH DAMAGE.
     *
     *      From: @(#)procfs_regs.c 8.4 (Berkeley) 6/15/94
     *
     * From:
     *      $Id: procfs_regs.c,v 3.2 1993/12/15 09:40:17 jsp Exp $
     * $FreeBSD$
     */
    
    #include <sys/param.h>
    #include <sys/systm.h>
    #include <sys/lock.h>
    #include <sys/mutex.h>
    #include <sys/proc.h>
    #include <sys/ptrace.h>
    #include <sys/uio.h>
    
    #include <fs/pseudofs/pseudofs.h>
    #include <fs/procfs/procfs.h>
    
    #ifdef COMPAT_FREEBSD32
    #include <sys/sysent.h>
    #include <sys/procfs.h>
    #include <machine/fpu.h>
    
    /*
     * PROC(write, dbregs, td2, &r) becomes
     * proc_write_dbregs(td2, &r)   or
     * proc_write_dbregs32(td2, &r32)
     *
     * UIOMOVE_FROMBUF(r, uio) becomes
     * uiomove_frombuf(&r, sizeof(r), uio)  or
     * uiomove_frombuf(&r32, sizeof(r32), uio)
     */
    #define PROC(d, w, t, r)        wrap32 ? \
            proc_ ## d ## _ ## w ## 32(t, r ## 32) : \
            proc_ ## d ## _ ## w(t, r)
    #define UIOMOVE_FROMBUF(k, u)   wrap32 ? \
            uiomove_frombuf(& k ## 32, sizeof(k ## 32), u) : \
            uiomove_frombuf(& k, sizeof(k), u)
    #else
    #define PROC(d, w, t, r)        proc_ ## d ## _ ## w(t, r)
    #define UIOMOVE_FROMBUF(k, u)   uiomove_frombuf(& k, sizeof(k), u)
    #endif
    
    int
    procfs_doprocdbregs(PFS_FILL_ARGS)
    {
            int error;
            struct dbreg r;
            struct thread *td2;
    #ifdef COMPAT_FREEBSD32
            struct dbreg32 r32;
            int wrap32 = 0;
    #endif
    
            if (uio->uio_offset != 0)
                    return (0);
    
            PROC_LOCK(p);
            PROC_ASSERT_HELD(p);
           if (p_candebug(td, p) != 0) {
                   PROC_UNLOCK(p);
                   return (EPERM);
           }
   
           td2 = FIRST_THREAD_IN_PROC(p);
   #ifdef COMPAT_FREEBSD32
           if (SV_CURPROC_FLAG(SV_ILP32)) {
                   if (SV_PROC_FLAG(td2->td_proc, SV_ILP32) == 0) {
                           PROC_UNLOCK(p);
                           return (EINVAL);
                   }
                   wrap32 = 1;
                   memset(&r32, 0, sizeof(r32));
           } else
   #endif
                   memset(&r, 0, sizeof(r));
           error = PROC(read, dbregs, td2, &r);
           if (error == 0) {
                   PROC_UNLOCK(p);
                   error = UIOMOVE_FROMBUF(r, uio);
                   PROC_LOCK(p);
           }
           if (error == 0 && uio->uio_rw == UIO_WRITE) {
                   if (!P_SHOULDSTOP(p)) /* XXXKSE should be P_TRACED? */
                           error = EBUSY;
                   else
                           /* XXXKSE: */
                           error = PROC(write, dbregs, td2, &r);
           }
           PROC_UNLOCK(p);
   
           return (error);
   }

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