sys/platform/vkernel/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/vkernel/i386/procfs_machdep.c,v 1.3 2007/02/19 01:14:23 corecode Exp $
  42  */
  43
  44 /*
  45  * Functions to be implemented here are:
  46  *
  47  * procfs_read_regs(lwp, 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(lwp, 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(lwp)
  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 <sys/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 lwp *lp, struct reg *regs)
  86 {
  87         return (fill_regs(lp, regs));
  88 }
  89
  90 int
  91 procfs_write_regs(struct lwp *lp, struct reg *regs)
  92 {
  93         return (set_regs(lp, regs));
  94 }
  95
  96 int
  97 procfs_read_dbregs(struct lwp *lp, struct dbreg *dbregs)
  98 {
  99         return (fill_dbregs(lp, dbregs));
 100 }
 101
 102 int
 103 procfs_write_dbregs(struct lwp *lp, struct dbreg *dbregs)
 104 {
 105         return (set_dbregs(lp, dbregs));
 106 }
 107
 108 /*
 109  * Ptrace doesn't support fpregs at all, and there are no security holes
 110  * or translations for fpregs, so we can just copy them.
 111  */
 112
 113 int
 114 procfs_read_fpregs(struct lwp *lp, struct fpreg *fpregs)
 115 {
 116         return (fill_fpregs(lp, fpregs));
 117 }
 118
 119 int
 120 procfs_write_fpregs(struct lwp *lp, struct fpreg *fpregs)
 121 {
 122         return (set_fpregs(lp, fpregs));
 123 }
 124
 125 int
 126 procfs_sstep(struct lwp *lp)
 127 {
 128         return (ptrace_single_step(lp));
 129 }