sys/platform/pc32/i386/procfs_machdep.c

   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: src/sys/i386/i386/procfs_machdep.c,v 1.14 1999/10/11 14:50:03 peter Exp $
  41  * $DragonFly: src/sys/platform/pc32/i386/procfs_machdep.c,v 1.6 2006/09/13 18:45:12 swildner Exp $
  42  */
  43
  44 /*
  45  * Functions to be implemented here are:
  46  *
  47  * procfs_read_regs(proc, regs)
  48  *      Get the current user-visible register set from the process
  49  *      and copy it into the regs structure (<machine/reg.h>).
  50  *      The process is stopped at the time read_regs is called.
  51  *
  52  * procfs_write_regs(proc, regs)
  53  *      Update the current register set from the passed in regs
  54  *      structure.  Take care to avoid clobbering special CPU
  55  *      registers or privileged bits in the PSL.
  56  *      Depending on the architecture this may have fix-up work to do,
  57  *      especially if the IAR or PCW are modified.
  58  *      The process is stopped at the time write_regs is called.
  59  *
  60  * procfs_read_fpregs, procfs_write_fpregs
  61  *      deal with the floating point register set, otherwise as above.
  62  *
  63  * procfs_read_dbregs, procfs_write_dbregs
  64  *      deal with the processor debug register set, otherwise as above.
  65  *
  66  * procfs_sstep(proc)
  67  *      Arrange for the process to trap after executing a single instruction.
  68  *
  69  */
  70
  71 #include <sys/param.h>
  72 #include <sys/proc.h>
  73 #include <sys/ptrace.h>
  74 #include <sys/vnode.h>
  75 #include <machine/reg.h>
  76 #include <machine/md_var.h>
  77 #include <vfs/procfs/procfs.h>
  78
  79 #include <vm/vm.h>
  80 #include <sys/lock.h>
  81 #include <vm/pmap.h>
  82 #include <vm/vm_map.h>
  83
  84 int
  85 procfs_read_regs(struct proc *p, struct reg *regs)
  86 {
  87         if (p->p_flag & P_SWAPPEDOUT)
  88                 return (EIO);
  89         return (fill_regs(&p->p_lwp, regs));
  90 }
  91
  92 int
  93 procfs_write_regs(struct proc *p, struct reg *regs)
  94 {
  95         if (p->p_flag & P_SWAPPEDOUT)
  96                 return (EIO);
  97         return (set_regs(&p->p_lwp, regs));
  98 }
  99
 100 int
 101 procfs_read_dbregs(struct proc *p, struct dbreg *dbregs)
 102 {
 103         if (p->p_flag & P_SWAPPEDOUT)
 104                 return (EIO);
 105         return (fill_dbregs(&p->p_lwp, dbregs));
 106 }
 107
 108 int
 109 procfs_write_dbregs(struct proc *p, struct dbreg *dbregs)
 110 {
 111         if (p->p_flag & P_SWAPPEDOUT)
 112                 return (EIO);
 113         return (set_dbregs(&p->p_lwp, dbregs));
 114 }
 115
 116 /*
 117  * Ptrace doesn't support fpregs at all, and there are no security holes
 118  * or translations for fpregs, so we can just copy them.
 119  */
 120
 121 int
 122 procfs_read_fpregs(struct proc *p, struct fpreg *fpregs)
 123 {
 124         if (p->p_flag & P_SWAPPEDOUT)
 125                 return (EIO);
 126         return (fill_fpregs(&p->p_lwp, fpregs));
 127 }
 128
 129 int
 130 procfs_write_fpregs(struct proc *p, struct fpreg *fpregs)
 131 {
 132         if (p->p_flag & P_SWAPPEDOUT)
 133                 return (EIO);
 134         return (set_fpregs(&p->p_lwp, fpregs));
 135 }
 136
 137 int
 138 procfs_sstep(struct proc *p)
 139 {
 140         if (p->p_flag & P_SWAPPEDOUT)
 141                 return (EIO);
 142         return (ptrace_single_step(&p->p_lwp));
 143 }