ptrace_machdep.c revision 278976 
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: head/sys/amd64/amd64/ptrace_machdep.c 278976 2015-02-18 23:34:03Z jhb $");
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
42static int
43cpu_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		fpugetregs(td);
55		savefpu = (char *)(get_pcb_user_save_td(td) + 1);
56		error = copyout(savefpu, addr,
57		    cpu_max_ext_state_size - sizeof(struct savefpu));
58		break;
59
60	case PT_SETXSTATE_OLD:
61		if (data > cpu_max_ext_state_size - sizeof(struct 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			fpugetregs(td);
69			error = fpusetxstate(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		fpugetregs(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(struct 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 = fpusetregs(td, (struct savefpu *)savefpu,
100			    savefpu + sizeof(struct savefpu), data -
101			    sizeof(struct savefpu));
102		free(savefpu, M_TEMP);
103		break;
104
105	default:
106		error = EINVAL;
107		break;
108	}
109
110	return (error);
111}
112
113#ifdef COMPAT_FREEBSD32
114#define PT_I386_GETXMMREGS	(PT_FIRSTMACH + 0)
115#define PT_I386_SETXMMREGS	(PT_FIRSTMACH + 1)
116
117static int
118cpu32_ptrace(struct thread *td, int req, void *addr, int data)
119{
120	struct savefpu *fpstate;
121	int error;
122
123	switch (req) {
124	case PT_I386_GETXMMREGS:
125		fpugetregs(td);
126		error = copyout(get_pcb_user_save_td(td), addr,
127		    sizeof(*fpstate));
128		break;
129
130	case PT_I386_SETXMMREGS:
131		fpugetregs(td);
132		fpstate = get_pcb_user_save_td(td);
133		error = copyin(addr, fpstate, sizeof(*fpstate));
134		fpstate->sv_env.en_mxcsr &= cpu_mxcsr_mask;
135		break;
136
137	case PT_GETXSTATE_OLD:
138	case PT_SETXSTATE_OLD:
139	case PT_GETXSTATE_INFO:
140	case PT_GETXSTATE:
141	case PT_SETXSTATE:
142		error = cpu_ptrace_xstate(td, req, addr, data);
143		break;
144
145	default:
146		error = EINVAL;
147		break;
148	}
149
150	return (error);
151}
152#endif
153
154int
155cpu_ptrace(struct thread *td, int req, void *addr, int data)
156{
157	int error;
158
159#ifdef COMPAT_FREEBSD32
160	if (SV_CURPROC_FLAG(SV_ILP32))
161		return (cpu32_ptrace(td, req, addr, data));
162#endif
163
164	/* Support old values of PT_GETXSTATE_OLD and PT_SETXSTATE_OLD. */
165	if (req == PT_FIRSTMACH + 0)
166		req = PT_GETXSTATE_OLD;
167	if (req == PT_FIRSTMACH + 1)
168		req = PT_SETXSTATE_OLD;
169
170	switch (req) {
171	case PT_GETXSTATE_OLD:
172	case PT_SETXSTATE_OLD:
173	case PT_GETXSTATE_INFO:
174	case PT_GETXSTATE:
175	case PT_SETXSTATE:
176		error = cpu_ptrace_xstate(td, req, addr, data);
177		break;
178
179	default:
180		error = EINVAL;
181		break;
182	}
183
184	return (error);
185}
186