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. 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_machdep.c 8.3 (Berkeley) 1/27/94
34 *
35 * From:
36 * $FreeBSD: src/sys/i386/i386/procfs_machdep.c,v 1.14 1999/10/11 14:50:03 peter Exp $
37 * $DragonFly: src/sys/platform/pc64/amd64/procfs_machdep.c,v 1.2 2007/09/24 03:24:45 yanyh Exp $
38 */
39
40 /*
41 * Functions to be implemented here are:
42 *
43 * procfs_read_regs(lwp, regs)
44 * Get the current user-visible register set from the process
45 * and copy it into the regs structure (<machine/reg.h>).
46 * The process is stopped at the time read_regs is called.
47 *
48 * procfs_write_regs(lwp, regs)
49 * Update the current register set from the passed in regs
50 * structure. Take care to avoid clobbering special CPU
51 * registers or privileged bits in the PSL.
52 * Depending on the architecture this may have fix-up work to do,
53 * especially if the IAR or PCW are modified.
54 * The process is stopped at the time write_regs is called.
55 *
56 * procfs_read_fpregs, procfs_write_fpregs
57 * deal with the floating point register set, otherwise as above.
58 *
59 * procfs_read_dbregs, procfs_write_dbregs
60 * deal with the processor debug register set, otherwise as above.
61 *
62 * procfs_sstep(lwp)
63 * Arrange for the process to trap after executing a single instruction.
64 *
65 */
66
67 #include <sys/param.h>
68 #include <sys/proc.h>
69 #include <sys/ptrace.h>
70 #include <sys/vnode.h>
71 #include <sys/reg.h>
72 #include <machine/md_var.h>
73 #include <vfs/procfs/procfs.h>
74
75 #include <vm/vm.h>
76 #include <sys/lock.h>
77 #include <vm/pmap.h>
78 #include <vm/vm_map.h>
79
80 int
procfs_read_regs(struct lwp * lp,struct reg * regs)81 procfs_read_regs(struct lwp *lp, struct reg *regs)
82 {
83 return (fill_regs(lp, regs));
84 }
85
86 int
procfs_write_regs(struct lwp * lp,struct reg * regs)87 procfs_write_regs(struct lwp *lp, struct reg *regs)
88 {
89 return (set_regs(lp, regs));
90 }
91
92 int
procfs_read_dbregs(struct lwp * lp,struct dbreg * dbregs)93 procfs_read_dbregs(struct lwp *lp, struct dbreg *dbregs)
94 {
95 return (fill_dbregs(lp, dbregs));
96 }
97
98 int
procfs_write_dbregs(struct lwp * lp,struct dbreg * dbregs)99 procfs_write_dbregs(struct lwp *lp, struct dbreg *dbregs)
100 {
101 return (set_dbregs(lp, dbregs));
102 }
103
104 /*
105 * Ptrace doesn't support fpregs at all, and there are no security holes
106 * or translations for fpregs, so we can just copy them.
107 */
108
109 int
procfs_read_fpregs(struct lwp * lp,struct fpreg * fpregs)110 procfs_read_fpregs(struct lwp *lp, struct fpreg *fpregs)
111 {
112 return (fill_fpregs(lp, fpregs));
113 }
114
115 int
procfs_write_fpregs(struct lwp * lp,struct fpreg * fpregs)116 procfs_write_fpregs(struct lwp *lp, struct fpreg *fpregs)
117 {
118 return (set_fpregs(lp, fpregs));
119 }
120
121 int
procfs_sstep(struct lwp * lp)122 procfs_sstep(struct lwp *lp)
123 {
124 return (ptrace_single_step(lp));
125 }
126