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: releng/11.0/sys/fs/procfs/procfs_fpregs.c 290530 2015-11-08 01:38:56Z markj $
   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/sysent.h>
   49 #include <sys/uio.h>
   50 
   51 #include <machine/reg.h>
   52 
   53 #include <fs/pseudofs/pseudofs.h>
   54 #include <fs/procfs/procfs.h>
   55 
   56 #ifdef COMPAT_FREEBSD32
   57 #include <sys/procfs.h>
   58 #include <machine/fpu.h>
   59 
   60 /*
   61  * PROC(write, fpregs, td2, &r) becomes
   62  * proc_write_fpregs(td2, &r)   or
   63  * proc_write_fpregs32(td2, &r32)
   64  *
   65  * UIOMOVE_FROMBUF(r, uio) becomes
   66  * uiomove_frombuf(&r, sizeof(r), uio)  or
   67  * uiomove_frombuf(&r32, sizeof(r32), uio)
   68  */
   69 #define PROC(d, w, t, r)        wrap32 ? \
   70         proc_ ## d ## _ ## w ## 32(t, r ## 32) : \
   71         proc_ ## d ## _ ## w(t, r)
   72 #define UIOMOVE_FROMBUF(k, u)   wrap32 ? \
   73         uiomove_frombuf(& k ## 32, sizeof(k ## 32), u) : \
   74         uiomove_frombuf(& k, sizeof(k), u)
   75 #else
   76 #define PROC(d, w, t, r)        proc_ ## d ## _ ## w(t, r)
   77 #define UIOMOVE_FROMBUF(k, u)   uiomove_frombuf(& k, sizeof(k), u)
   78 #endif
   79 
   80 int
   81 procfs_doprocfpregs(PFS_FILL_ARGS)
   82 {
   83         int error;
   84         struct fpreg r;
   85         struct thread *td2;
   86 #ifdef COMPAT_FREEBSD32
   87         struct fpreg32 r32;
   88         int wrap32 = 0;
   89 #endif
   90 
   91         if (uio->uio_offset != 0)
   92                 return (0);
   93 
   94         PROC_LOCK(p);
   95         PROC_ASSERT_HELD(p);
   96         if (p_candebug(td, p)) {
   97                 PROC_UNLOCK(p);
   98                 return (EPERM);
   99         }
  100         if (!P_SHOULDSTOP(p)) {
  101                 PROC_UNLOCK(p);
  102                 return (EBUSY);
  103         }
  104 
  105         /* XXXKSE: */
  106         td2 = FIRST_THREAD_IN_PROC(p);
  107 #ifdef COMPAT_FREEBSD32
  108         if (SV_CURPROC_FLAG(SV_ILP32)) {
  109                 if (SV_PROC_FLAG(td2->td_proc, SV_ILP32) == 0) {
  110                         PROC_UNLOCK(p);
  111                         return (EINVAL);
  112                 }
  113                 wrap32 = 1;
  114         }
  115 #endif
  116         error = PROC(read, fpregs, td2, &r);
  117         if (error == 0) {
  118                 PROC_UNLOCK(p);
  119                 error = UIOMOVE_FROMBUF(r, uio);
  120                 PROC_LOCK(p);
  121         }
  122         if (error == 0 && uio->uio_rw == UIO_WRITE) {
  123                 if (!P_SHOULDSTOP(p))
  124                         error = EBUSY;
  125                 else
  126                         /* XXXKSE: */
  127                         error = PROC(write, fpregs, td2, &r);
  128         }
  129         PROC_UNLOCK(p);
  130 
  131         return (error);
  132 }

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