FreeBSD/Linux Kernel Cross Reference
sys/i386/i386/procfs_machdep.c

     /*
      * Copyright (c) 1993
      *      The Regents of the University of California.  All rights reserved.
      * Copyright (c) 1993 Jan-Simon Pendry
      *
      * 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. All advertising materials mentioning features or use of this software
     *    must display the following acknowledgement:
     *      This product includes software developed by the University of
     *      California, Berkeley and its contributors.
     * 4. 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.
     *
     *      @(#)procfs_machdep.c    8.3 (Berkeley) 1/27/94
     *
     * From:
     * $FreeBSD: src/sys/i386/i386/procfs_machdep.c,v 1.6.4.1 1999/09/05 08:11:15 peter Exp $
     */
    
    /*
     * Functions to be implemented here are:
     *
     * procfs_read_regs(proc, regs)
     *      Get the current user-visible register set from the process
     *      and copy it into the regs structure (<machine/reg.h>).
     *      The process is stopped at the time read_regs is called.
     *
     * procfs_write_regs(proc, regs)
     *      Update the current register set from the passed in regs
     *      structure.  Take care to avoid clobbering special CPU
     *      registers or privileged bits in the PSL.
     *      Depending on the architecture this may have fix-up work to do,
     *      especially if the IAR or PCW are modified.
     *      The process is stopped at the time write_regs is called.
     *
     * procfs_read_fpregs, procfs_write_fpregs
     *      deal with the floating point register set, otherwise as above.
     *
     * procfs_sstep(proc)
     *      Arrange for the process to trap after executing a single instruction.
     *
     */
    
    #include <sys/param.h>
    #include <sys/systm.h>
    #include <sys/time.h>
    #include <sys/kernel.h>
    #include <sys/proc.h>
    #include <sys/ptrace.h>
    #include <sys/vnode.h>
    #include <machine/psl.h>
    #include <machine/reg.h>
    #include <machine/frame.h>
    #include <machine/md_var.h>
    #include <miscfs/procfs/procfs.h>
    
    #include <vm/vm.h>
    #include <vm/vm_param.h>
    #include <vm/vm_prot.h>
    #include <vm/lock.h>
    #include <vm/pmap.h>
    #include <vm/vm_map.h>
    
    #include <sys/user.h>
    
    int
    procfs_read_regs(p, regs)
            struct proc *p;
            struct reg *regs;
    {
            if ((p->p_flag & P_INMEM) == 0)
                    return (EIO);
            return (fill_regs(p, regs));
    }
    
    int
   procfs_write_regs(p, regs)
           struct proc *p;
           struct reg *regs;
   {
           if ((p->p_flag & P_INMEM) == 0)
                   return (EIO);
           return (set_regs(p, regs));
   }
   
   /*
    * Ptrace doesn't support fpregs at all, and there are no security holes
    * or translations for fpregs, so we can just copy them.
    */
   
   int
   procfs_read_fpregs(p, fpregs)
           struct proc *p;
           struct fpreg *fpregs;
   {
           if ((p->p_flag & P_INMEM) == 0)
                   return (EIO);
           bcopy(&p->p_addr->u_pcb.pcb_savefpu, fpregs, sizeof *fpregs);
           return (0);
   }
   
   int
   procfs_write_fpregs(p, fpregs)
           struct proc *p;
           struct fpreg *fpregs;
   {
           if ((p->p_flag & P_INMEM) == 0)
                   return (EIO);
           bcopy(fpregs, &p->p_addr->u_pcb.pcb_savefpu, sizeof *fpregs);
           return (0);
   }
   
   int
   procfs_sstep(p)
           struct proc *p;
   {
           if ((p->p_flag & P_INMEM) == 0)
                   return (EIO);
           return (ptrace_single_step(p));
   }

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