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/pc64/amd64/procfs_machdep.c,v 1.2 2007/09/24 03:24:45 yanyh 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 }
130