1 /*-
2 * SPDX-License-Identifier: BSD-2-Clause
3 *
4 * Copyright (c) 2005 Doug Rabson
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 *
28 */
29
30 #include <sys/cdefs.h>
31 #include "opt_cpu.h"
32
33 #include <sys/param.h>
34 #include <sys/systm.h>
35 #include <sys/elf.h>
36 #include <sys/lock.h>
37 #include <sys/malloc.h>
38 #include <sys/mutex.h>
39 #include <sys/proc.h>
40 #include <sys/ptrace.h>
41 #include <sys/reg.h>
42 #include <machine/frame.h>
43 #include <machine/md_var.h>
44 #include <machine/pcb.h>
45
46 static uint32_t
get_segbase(struct segment_descriptor * sdp)47 get_segbase(struct segment_descriptor *sdp)
48 {
49 return (sdp->sd_hibase << 24 | sdp->sd_lobase);
50 }
51
52 static bool
get_segbases(struct regset * rs,struct thread * td,void * buf,size_t * sizep)53 get_segbases(struct regset *rs, struct thread *td, void *buf,
54 size_t *sizep)
55 {
56 struct segbasereg *reg;
57
58 if (buf != NULL) {
59 KASSERT(*sizep == sizeof(*reg), ("%s: invalid size", __func__));
60 reg = buf;
61 reg->r_fsbase = get_segbase(&td->td_pcb->pcb_fsd);
62 reg->r_gsbase = get_segbase(&td->td_pcb->pcb_gsd);
63 }
64 *sizep = sizeof(*reg);
65 return (true);
66 }
67
68 static bool
set_segbases(struct regset * rs,struct thread * td,void * buf,size_t size)69 set_segbases(struct regset *rs, struct thread *td, void *buf,
70 size_t size)
71 {
72 struct segbasereg *reg;
73
74 KASSERT(size == sizeof(*reg), ("%s: invalid size", __func__));
75 reg = buf;
76
77 fill_based_sd(&td->td_pcb->pcb_fsd, reg->r_fsbase);
78 td->td_frame->tf_fs = GSEL(GUFS_SEL, SEL_UPL);
79 fill_based_sd(&td->td_pcb->pcb_gsd, reg->r_gsbase);
80 td->td_pcb->pcb_gs = GSEL(GUGS_SEL, SEL_UPL);
81
82 return (true);
83 }
84
85 static struct regset regset_segbases = {
86 .note = NT_X86_SEGBASES,
87 .size = sizeof(struct segbasereg),
88 .get = get_segbases,
89 .set = set_segbases,
90 };
91 ELF_REGSET(regset_segbases);
92
93 static int
cpu_ptrace_xstate(struct thread * td,int req,void * addr,int data)94 cpu_ptrace_xstate(struct thread *td, int req, void *addr, int data)
95 {
96 struct ptrace_xstate_info info;
97 char *savefpu;
98 int error;
99
100 if (!use_xsave)
101 return (EOPNOTSUPP);
102
103 switch (req) {
104 case PT_GETXSTATE_OLD:
105 npxgetregs(td);
106 savefpu = (char *)(get_pcb_user_save_td(td) + 1);
107 error = copyout(savefpu, addr,
108 cpu_max_ext_state_size - sizeof(union savefpu));
109 break;
110
111 case PT_SETXSTATE_OLD:
112 if (data > cpu_max_ext_state_size - sizeof(union savefpu)) {
113 error = EINVAL;
114 break;
115 }
116 savefpu = malloc(data, M_TEMP, M_WAITOK);
117 error = copyin(addr, savefpu, data);
118 if (error == 0) {
119 npxgetregs(td);
120 error = npxsetxstate(td, savefpu, data);
121 }
122 free(savefpu, M_TEMP);
123 break;
124
125 case PT_GETXSTATE_INFO:
126 if (data != sizeof(info)) {
127 error = EINVAL;
128 break;
129 }
130 info.xsave_len = cpu_max_ext_state_size;
131 info.xsave_mask = xsave_mask;
132 error = copyout(&info, addr, data);
133 break;
134
135 case PT_GETXSTATE:
136 npxgetregs(td);
137 savefpu = (char *)(get_pcb_user_save_td(td));
138 error = copyout(savefpu, addr, cpu_max_ext_state_size);
139 break;
140
141 case PT_SETXSTATE:
142 if (data < sizeof(union savefpu) ||
143 data > cpu_max_ext_state_size) {
144 error = EINVAL;
145 break;
146 }
147 savefpu = malloc(data, M_TEMP, M_WAITOK);
148 error = copyin(addr, savefpu, data);
149 if (error == 0)
150 error = npxsetregs(td, (union savefpu *)savefpu,
151 savefpu + sizeof(union savefpu), data -
152 sizeof(union savefpu));
153 free(savefpu, M_TEMP);
154 break;
155
156 default:
157 error = EINVAL;
158 break;
159 }
160
161 return (error);
162 }
163
164 static int
cpu_ptrace_xmm(struct thread * td,int req,void * addr,int data)165 cpu_ptrace_xmm(struct thread *td, int req, void *addr, int data)
166 {
167 struct savexmm *fpstate;
168 int error;
169
170 if (!cpu_fxsr)
171 return (EINVAL);
172
173 fpstate = &get_pcb_user_save_td(td)->sv_xmm;
174 switch (req) {
175 case PT_GETXMMREGS:
176 npxgetregs(td);
177 error = copyout(fpstate, addr, sizeof(*fpstate));
178 break;
179
180 case PT_SETXMMREGS:
181 npxgetregs(td);
182 error = copyin(addr, fpstate, sizeof(*fpstate));
183 fpstate->sv_env.en_mxcsr &= cpu_mxcsr_mask;
184 break;
185
186 case PT_GETXSTATE_OLD:
187 case PT_SETXSTATE_OLD:
188 case PT_GETXSTATE_INFO:
189 case PT_GETXSTATE:
190 case PT_SETXSTATE:
191 error = cpu_ptrace_xstate(td, req, addr, data);
192 break;
193
194 default:
195 return (EINVAL);
196 }
197
198 return (error);
199 }
200
201 int
cpu_ptrace(struct thread * td,int req,void * addr,int data)202 cpu_ptrace(struct thread *td, int req, void *addr, int data)
203 {
204 struct segment_descriptor *sdp, sd;
205 register_t r;
206 int error;
207
208 switch (req) {
209 case PT_GETXMMREGS:
210 case PT_SETXMMREGS:
211 case PT_GETXSTATE_OLD:
212 case PT_SETXSTATE_OLD:
213 case PT_GETXSTATE_INFO:
214 case PT_GETXSTATE:
215 case PT_SETXSTATE:
216 error = cpu_ptrace_xmm(td, req, addr, data);
217 break;
218
219 case PT_GETFSBASE:
220 case PT_GETGSBASE:
221 sdp = req == PT_GETFSBASE ? &td->td_pcb->pcb_fsd :
222 &td->td_pcb->pcb_gsd;
223 r = get_segbase(sdp);
224 error = copyout(&r, addr, sizeof(r));
225 break;
226
227 case PT_SETFSBASE:
228 case PT_SETGSBASE:
229 error = copyin(addr, &r, sizeof(r));
230 if (error != 0)
231 break;
232 fill_based_sd(&sd, r);
233 if (req == PT_SETFSBASE) {
234 td->td_pcb->pcb_fsd = sd;
235 td->td_frame->tf_fs = GSEL(GUFS_SEL, SEL_UPL);
236 } else {
237 td->td_pcb->pcb_gsd = sd;
238 td->td_pcb->pcb_gs = GSEL(GUGS_SEL, SEL_UPL);
239 }
240 break;
241
242 default:
243 return (EINVAL);
244 }
245
246 return (error);
247 }
248
249 int
ptrace_set_pc(struct thread * td,u_long addr)250 ptrace_set_pc(struct thread *td, u_long addr)
251 {
252
253 td->td_frame->tf_eip = addr;
254 return (0);
255 }
256
257 int
ptrace_single_step(struct thread * td)258 ptrace_single_step(struct thread *td)
259 {
260
261 PROC_LOCK_ASSERT(td->td_proc, MA_OWNED);
262 if ((td->td_frame->tf_eflags & PSL_T) == 0) {
263 td->td_frame->tf_eflags |= PSL_T;
264 td->td_dbgflags |= TDB_STEP;
265 }
266 return (0);
267 }
268
269 int
ptrace_clear_single_step(struct thread * td)270 ptrace_clear_single_step(struct thread *td)
271 {
272
273 PROC_LOCK_ASSERT(td->td_proc, MA_OWNED);
274 td->td_frame->tf_eflags &= ~PSL_T;
275 td->td_dbgflags &= ~TDB_STEP;
276 return (0);
277 }
278