1 /*-
2 * Copyright (c) 2011 Konstantin Belousov <kib@FreeBSD.org>
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 *
26 */
27
28 #include <sys/cdefs.h>
29 __FBSDID("$FreeBSD: releng/10.1/sys/amd64/amd64/ptrace_machdep.c 238669 2012-07-21 13:06:37Z kib $");
30
31 #include "opt_compat.h"
32
33 #include <sys/param.h>
34 #include <sys/systm.h>
35 #include <sys/malloc.h>
36 #include <sys/proc.h>
37 #include <sys/ptrace.h>
38 #include <sys/sysent.h>
39 #include <machine/md_var.h>
40 #include <machine/pcb.h>
41
42 static int
43 cpu_ptrace_xstate(struct thread *td, int req, void *addr, int data)
44 {
45 char *savefpu;
46 int error;
47
48 if (!use_xsave)
49 return (EOPNOTSUPP);
50
51 switch (req) {
52 case PT_GETXSTATE:
53 fpugetregs(td);
54 savefpu = (char *)(get_pcb_user_save_td(td) + 1);
55 error = copyout(savefpu, addr,
56 cpu_max_ext_state_size - sizeof(struct savefpu));
57 break;
58
59 case PT_SETXSTATE:
60 if (data > cpu_max_ext_state_size - sizeof(struct savefpu)) {
61 error = EINVAL;
62 break;
63 }
64 savefpu = malloc(data, M_TEMP, M_WAITOK);
65 error = copyin(addr, savefpu, data);
66 if (error == 0) {
67 fpugetregs(td);
68 error = fpusetxstate(td, savefpu, data);
69 }
70 free(savefpu, M_TEMP);
71 break;
72
73 default:
74 error = EINVAL;
75 break;
76 }
77
78 return (error);
79 }
80
81 #ifdef COMPAT_FREEBSD32
82 #define PT_I386_GETXMMREGS (PT_FIRSTMACH + 0)
83 #define PT_I386_SETXMMREGS (PT_FIRSTMACH + 1)
84 #define PT_I386_GETXSTATE (PT_FIRSTMACH + 2)
85 #define PT_I386_SETXSTATE (PT_FIRSTMACH + 3)
86
87 static int
88 cpu32_ptrace(struct thread *td, int req, void *addr, int data)
89 {
90 struct savefpu *fpstate;
91 int error;
92
93 switch (req) {
94 case PT_I386_GETXMMREGS:
95 fpugetregs(td);
96 error = copyout(get_pcb_user_save_td(td), addr,
97 sizeof(*fpstate));
98 break;
99
100 case PT_I386_SETXMMREGS:
101 fpugetregs(td);
102 fpstate = get_pcb_user_save_td(td);
103 error = copyin(addr, fpstate, sizeof(*fpstate));
104 fpstate->sv_env.en_mxcsr &= cpu_mxcsr_mask;
105 break;
106
107 case PT_I386_GETXSTATE:
108 error = cpu_ptrace_xstate(td, PT_GETXSTATE, addr, data);
109 break;
110
111 case PT_I386_SETXSTATE:
112 error = cpu_ptrace_xstate(td, PT_SETXSTATE, addr, data);
113 break;
114
115 default:
116 error = EINVAL;
117 break;
118 }
119
120 return (error);
121 }
122 #endif
123
124 int
125 cpu_ptrace(struct thread *td, int req, void *addr, int data)
126 {
127 int error;
128
129 #ifdef COMPAT_FREEBSD32
130 if (SV_CURPROC_FLAG(SV_ILP32))
131 return (cpu32_ptrace(td, req, addr, data));
132 #endif
133
134 /* Support old values of PT_GETXSTATE and PT_SETXSTATE. */
135 if (req == PT_FIRSTMACH + 0)
136 req = PT_GETXSTATE;
137 if (req == PT_FIRSTMACH + 1)
138 req = PT_SETXSTATE;
139
140 switch (req) {
141 case PT_GETXSTATE:
142 case PT_SETXSTATE:
143 error = cpu_ptrace_xstate(td, req, addr, data);
144 break;
145
146 default:
147 error = EINVAL;
148 break;
149 }
150
151 return (error);
152 }
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