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