ptrace_machdep.c revision 230426 
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 230426 2012-01-21 17:45:27Z 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
42static int
43cpu_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		savefpu = (char *)(get_pcb_user_save_td(td) + 1);
54		error = copyout(savefpu, addr,
55		    cpu_max_ext_state_size - sizeof(struct savefpu));
56		break;
57
58	case PT_SETXSTATE:
59		if (data > cpu_max_ext_state_size - sizeof(struct savefpu)) {
60			error = EINVAL;
61			break;
62		}
63		savefpu = malloc(data, M_TEMP, M_WAITOK);
64		error = copyin(addr, savefpu, data);
65		if (error == 0)
66			error = fpusetxstate(td, savefpu, data);
67		free(savefpu, M_TEMP);
68		break;
69
70	default:
71		error = EINVAL;
72		break;
73	}
74
75	return (error);
76}
77
78#ifdef COMPAT_FREEBSD32
79#define PT_I386_GETXMMREGS	(PT_FIRSTMACH + 0)
80#define PT_I386_SETXMMREGS	(PT_FIRSTMACH + 1)
81#define PT_I386_GETXSTATE	(PT_FIRSTMACH + 2)
82#define PT_I386_SETXSTATE	(PT_FIRSTMACH + 3)
83
84static int
85cpu32_ptrace(struct thread *td, int req, void *addr, int data)
86{
87	struct savefpu *fpstate;
88	int error;
89
90	switch (req) {
91	case PT_I386_GETXMMREGS:
92		error = copyout(get_pcb_user_save_td(td), addr,
93		    sizeof(*fpstate));
94		break;
95
96	case PT_I386_SETXMMREGS:
97		fpstate = get_pcb_user_save_td(td);
98		error = copyin(addr, fpstate, sizeof(*fpstate));
99		fpstate->sv_env.en_mxcsr &= cpu_mxcsr_mask;
100		break;
101
102	case PT_I386_GETXSTATE:
103		error = cpu_ptrace_xstate(td, PT_GETXSTATE, addr, data);
104		break;
105
106	case PT_I386_SETXSTATE:
107		error = cpu_ptrace_xstate(td, PT_SETXSTATE, addr, data);
108		break;
109
110	default:
111		error = EINVAL;
112		break;
113	}
114
115	return (error);
116}
117#endif
118
119int
120cpu_ptrace(struct thread *td, int req, void *addr, int data)
121{
122	int error;
123
124#ifdef COMPAT_FREEBSD32
125	if (SV_CURPROC_FLAG(SV_ILP32))
126		return (cpu32_ptrace(td, req, addr, data));
127#endif
128
129	switch (req) {
130	case PT_GETXSTATE:
131	case PT_SETXSTATE:
132		error = cpu_ptrace_xstate(td, req, addr, data);
133		break;
134
135	default:
136		error = EINVAL;
137		break;
138	}
139
140	return (error);
141}
142