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_fpregs.c

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    1 /*-
    2  * Copyright (c) 1993 Jan-Simon Pendry
    3  * Copyright (c) 1993
    4  *      The Regents of the University of California.  All rights reserved.
    5  *
    6  * This code is derived from software contributed to Berkeley by
    7  * Jan-Simon Pendry.
    8  *
    9  * Redistribution and use in source and binary forms, with or without
   10  * modification, are permitted provided that the following conditions
   11  * are met:
   12  * 1. Redistributions of source code must retain the above copyright
   13  *    notice, this list of conditions and the following disclaimer.
   14  * 2. Redistributions in binary form must reproduce the above copyright
   15  *    notice, this list of conditions and the following disclaimer in the
   16  *    documentation and/or other materials provided with the distribution.
   17  * 4. Neither the name of the University nor the names of its contributors
   18  *    may be used to endorse or promote products derived from this software
   19  *    without specific prior written permission.
   20  *
   21  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   31  * SUCH DAMAGE.
   32  *
   33  *      @(#)procfs_fpregs.c     8.2 (Berkeley) 6/15/94
   34  *
   35  * From:
   36  *      $Id: procfs_regs.c,v 3.2 1993/12/15 09:40:17 jsp Exp $
   37  * $FreeBSD$
   38  */
   39 
   40 #include "opt_compat.h"
   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 <machine/reg.h>
   51 
   52 #include <fs/pseudofs/pseudofs.h>
   53 #include <fs/procfs/procfs.h>
   54 
   55 #ifdef COMPAT_IA32
   56 #include <sys/procfs.h>
   57 #include <machine/fpu.h>
   58 #include <compat/ia32/ia32_reg.h>
   59 
   60 extern struct sysentvec ia32_freebsd_sysvec;
   61 /*
   62  * PROC(write, fpregs, td2, &r) becomes
   63  * proc_write_fpregs(td2, &r)   or
   64  * proc_write_fpregs32(td2, &r32)
   65  *
   66  * UIOMOVE_FROMBUF(r, uio) becomes
   67  * uiomove_frombuf(&r, sizeof(r), uio)  or
   68  * uiomove_frombuf(&r32, sizeof(r32), uio)
   69  */
   70 #define PROC(d, w, t, r)        wrap32 ? \
   71         proc_ ## d ## _ ## w ## 32(t, r ## 32) : \
   72         proc_ ## d ## _ ## w(t, r)
   73 #define UIOMOVE_FROMBUF(k, u)   wrap32 ? \
   74         uiomove_frombuf(& k ## 32, sizeof(k ## 32), u) : \
   75         uiomove_frombuf(& k, sizeof(k), u)
   76 #else
   77 #define PROC(d, w, t, r)        proc_ ## d ## _ ## w(t, r)
   78 #define UIOMOVE_FROMBUF(k, u)   uiomove_frombuf(& k, sizeof(k), u)
   79 #endif
   80 
   81 int
   82 procfs_doprocfpregs(PFS_FILL_ARGS)
   83 {
   84         int error;
   85         struct fpreg r;
   86         struct thread *td2;
   87 #ifdef COMPAT_IA32
   88         struct fpreg32 r32;
   89         int wrap32 = 0;
   90 #endif
   91 
   92         if (uio->uio_offset != 0)
   93                 return (0);
   94 
   95         PROC_LOCK(p);
   96         KASSERT(p->p_lock > 0, ("proc not held"));
   97         if (p_candebug(td, p)) {
   98                 PROC_UNLOCK(p);
   99                 return (EPERM);
  100         }
  101 
  102         /* XXXKSE: */
  103         td2 = FIRST_THREAD_IN_PROC(p);
  104 #ifdef COMPAT_IA32
  105         if (td->td_proc->p_sysent == &ia32_freebsd_sysvec) {
  106                 if (td2->td_proc->p_sysent != &ia32_freebsd_sysvec) {
  107                         PROC_UNLOCK(p);
  108                         return (EINVAL);
  109                 }
  110                 wrap32 = 1;
  111         }
  112 #endif
  113         error = PROC(read, fpregs, td2, &r);
  114         if (error == 0) {
  115                 PROC_UNLOCK(p);
  116                 error = UIOMOVE_FROMBUF(r, uio);
  117                 PROC_LOCK(p);
  118         }
  119         if (error == 0 && uio->uio_rw == UIO_WRITE) {
  120                 if (!P_SHOULDSTOP(p))
  121                         error = EBUSY;
  122                 else
  123                         /* XXXKSE: */
  124                         error = PROC(write, fpregs, td2, &r);
  125         }
  126         PROC_UNLOCK(p);
  127 
  128         return (error);
  129 }

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