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/i386/i386/procfs_machdep.c

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    1 /*
    2  * Copyright (c) 1993
    3  *      The Regents of the University of California.  All rights reserved.
    4  * Copyright (c) 1993 Jan-Simon Pendry
    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  * 3. All advertising materials mentioning features or use of this software
   18  *    must display the following acknowledgement:
   19  *      This product includes software developed by the University of
   20  *      California, Berkeley and its contributors.
   21  * 4. Neither the name of the University nor the names of its contributors
   22  *    may be used to endorse or promote products derived from this software
   23  *    without specific prior written permission.
   24  *
   25  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   26  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   27  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   28  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   29  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   30  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   31  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   32  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   33  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   34  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   35  * SUCH DAMAGE.
   36  *
   37  *      @(#)procfs_machdep.c    8.3 (Berkeley) 1/27/94
   38  *
   39  * From:
   40  * $FreeBSD$
   41  */
   42 
   43 /*
   44  * Functions to be implemented here are:
   45  *
   46  * procfs_read_regs(proc, regs)
   47  *      Get the current user-visible register set from the process
   48  *      and copy it into the regs structure (<machine/reg.h>).
   49  *      The process is stopped at the time read_regs is called.
   50  *
   51  * procfs_write_regs(proc, regs)
   52  *      Update the current register set from the passed in regs
   53  *      structure.  Take care to avoid clobbering special CPU
   54  *      registers or privileged bits in the PSL.
   55  *      Depending on the architecture this may have fix-up work to do,
   56  *      especially if the IAR or PCW are modified.
   57  *      The process is stopped at the time write_regs is called.
   58  *
   59  * procfs_read_fpregs, procfs_write_fpregs
   60  *      deal with the floating point register set, otherwise as above.
   61  *
   62  * procfs_sstep(proc)
   63  *      Arrange for the process to trap after executing a single instruction.
   64  *
   65  */
   66 
   67 #include <sys/param.h>
   68 #include <sys/systm.h>
   69 #include <sys/proc.h>
   70 #include <sys/ptrace.h>
   71 #include <sys/vnode.h>
   72 #include <machine/reg.h>
   73 #include <machine/md_var.h>
   74 #include <miscfs/procfs/procfs.h>
   75 
   76 #include <vm/vm.h>
   77 #include <sys/lock.h>
   78 #include <vm/pmap.h>
   79 #include <vm/vm_map.h>
   80 
   81 #include <sys/user.h>
   82 
   83 int
   84 procfs_read_regs(p, regs)
   85         struct proc *p;
   86         struct reg *regs;
   87 {
   88         if ((p->p_flag & P_INMEM) == 0)
   89                 return (EIO);
   90         return (fill_regs(p, regs));
   91 }
   92 
   93 int
   94 procfs_write_regs(p, regs)
   95         struct proc *p;
   96         struct reg *regs;
   97 {
   98         if ((p->p_flag & P_INMEM) == 0)
   99                 return (EIO);
  100         return (set_regs(p, regs));
  101 }
  102 
  103 /*
  104  * Ptrace doesn't support fpregs at all, and there are no security holes
  105  * or translations for fpregs, so we can just copy them.
  106  */
  107 
  108 int
  109 procfs_read_fpregs(p, fpregs)
  110         struct proc *p;
  111         struct fpreg *fpregs;
  112 {
  113         if ((p->p_flag & P_INMEM) == 0)
  114                 return (EIO);
  115         return (fill_fpregs(p, fpregs));
  116 }
  117 
  118 int
  119 procfs_write_fpregs(p, fpregs)
  120         struct proc *p;
  121         struct fpreg *fpregs;
  122 {
  123         if ((p->p_flag & P_INMEM) == 0)
  124                 return (EIO);
  125         return (set_fpregs(p, fpregs));
  126 }
  127 
  128 int
  129 procfs_sstep(p)
  130         struct proc *p;
  131 {
  132         if ((p->p_flag & P_INMEM) == 0)
  133                 return (EIO);
  134         return (ptrace_single_step(p));
  135 }

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