1 /*-
2 * Copyright (c) 2005 Doug Rabson
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/11.2/sys/i386/i386/ptrace_machdep.c 331722 2018-03-29 02:50:57Z eadler $");
30
31 #include "opt_cpu.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 <machine/frame.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 struct ptrace_xstate_info info;
46 char *savefpu;
47 int error;
48
49 if (!use_xsave)
50 return (EOPNOTSUPP);
51
52 switch (req) {
53 case PT_GETXSTATE_OLD:
54 npxgetregs(td);
55 savefpu = (char *)(get_pcb_user_save_td(td) + 1);
56 error = copyout(savefpu, addr,
57 cpu_max_ext_state_size - sizeof(union savefpu));
58 break;
59
60 case PT_SETXSTATE_OLD:
61 if (data > cpu_max_ext_state_size - sizeof(union savefpu)) {
62 error = EINVAL;
63 break;
64 }
65 savefpu = malloc(data, M_TEMP, M_WAITOK);
66 error = copyin(addr, savefpu, data);
67 if (error == 0) {
68 npxgetregs(td);
69 error = npxsetxstate(td, savefpu, data);
70 }
71 free(savefpu, M_TEMP);
72 break;
73
74 case PT_GETXSTATE_INFO:
75 if (data != sizeof(info)) {
76 error = EINVAL;
77 break;
78 }
79 info.xsave_len = cpu_max_ext_state_size;
80 info.xsave_mask = xsave_mask;
81 error = copyout(&info, addr, data);
82 break;
83
84 case PT_GETXSTATE:
85 npxgetregs(td);
86 savefpu = (char *)(get_pcb_user_save_td(td));
87 error = copyout(savefpu, addr, cpu_max_ext_state_size);
88 break;
89
90 case PT_SETXSTATE:
91 if (data < sizeof(union savefpu) ||
92 data > cpu_max_ext_state_size) {
93 error = EINVAL;
94 break;
95 }
96 savefpu = malloc(data, M_TEMP, M_WAITOK);
97 error = copyin(addr, savefpu, data);
98 if (error == 0)
99 error = npxsetregs(td, (union savefpu *)savefpu,
100 savefpu + sizeof(union savefpu), data -
101 sizeof(union savefpu));
102 free(savefpu, M_TEMP);
103 break;
104
105 default:
106 error = EINVAL;
107 break;
108 }
109
110 return (error);
111 }
112
113 static int
114 cpu_ptrace_xmm(struct thread *td, int req, void *addr, int data)
115 {
116 struct savexmm *fpstate;
117 int error;
118
119 if (!cpu_fxsr)
120 return (EINVAL);
121
122 fpstate = &get_pcb_user_save_td(td)->sv_xmm;
123 switch (req) {
124 case PT_GETXMMREGS:
125 npxgetregs(td);
126 error = copyout(fpstate, addr, sizeof(*fpstate));
127 break;
128
129 case PT_SETXMMREGS:
130 npxgetregs(td);
131 error = copyin(addr, fpstate, sizeof(*fpstate));
132 fpstate->sv_env.en_mxcsr &= cpu_mxcsr_mask;
133 break;
134
135 case PT_GETXSTATE_OLD:
136 case PT_SETXSTATE_OLD:
137 case PT_GETXSTATE_INFO:
138 case PT_GETXSTATE:
139 case PT_SETXSTATE:
140 error = cpu_ptrace_xstate(td, req, addr, data);
141 break;
142
143 default:
144 return (EINVAL);
145 }
146
147 return (error);
148 }
149
150 int
151 cpu_ptrace(struct thread *td, int req, void *addr, int data)
152 {
153 struct segment_descriptor *sdp, sd;
154 register_t r;
155 int error;
156
157 switch (req) {
158 case PT_GETXMMREGS:
159 case PT_SETXMMREGS:
160 case PT_GETXSTATE_OLD:
161 case PT_SETXSTATE_OLD:
162 case PT_GETXSTATE_INFO:
163 case PT_GETXSTATE:
164 case PT_SETXSTATE:
165 error = cpu_ptrace_xmm(td, req, addr, data);
166 break;
167
168 case PT_GETFSBASE:
169 case PT_GETGSBASE:
170 sdp = req == PT_GETFSBASE ? &td->td_pcb->pcb_fsd :
171 &td->td_pcb->pcb_gsd;
172 r = sdp->sd_hibase << 24 | sdp->sd_lobase;
173 error = copyout(&r, addr, sizeof(r));
174 break;
175
176 case PT_SETFSBASE:
177 case PT_SETGSBASE:
178 error = copyin(addr, &r, sizeof(r));
179 if (error != 0)
180 break;
181 fill_based_sd(&sd, r);
182 if (req == PT_SETFSBASE) {
183 td->td_pcb->pcb_fsd = sd;
184 td->td_frame->tf_fs = GSEL(GUFS_SEL, SEL_UPL);
185 } else {
186 td->td_pcb->pcb_gsd = sd;
187 td->td_pcb->pcb_gs = GSEL(GUGS_SEL, SEL_UPL);
188 }
189 break;
190
191 default:
192 return (EINVAL);
193 }
194
195 return (error);
196 }
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