ptrace_machdep.c revision 279211 
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: stable/10/sys/i386/i386/ptrace_machdep.c 279211 2015-02-23 18:38:41Z jhb $");
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/md_var.h>
39#include <machine/pcb.h>
40
41#if !defined(CPU_DISABLE_SSE) && defined(I686_CPU)
42#define CPU_ENABLE_SSE
43#endif
44
45#ifdef CPU_ENABLE_SSE
46static int
47cpu_ptrace_xstate(struct thread *td, int req, void *addr, int data)
48{
49	struct ptrace_xstate_info info;
50	char *savefpu;
51	int error;
52
53	if (!use_xsave)
54		return (EOPNOTSUPP);
55
56	switch (req) {
57	case PT_GETXSTATE_OLD:
58		npxgetregs(td);
59		savefpu = (char *)(get_pcb_user_save_td(td) + 1);
60		error = copyout(savefpu, addr,
61		    cpu_max_ext_state_size - sizeof(union savefpu));
62		break;
63
64	case PT_SETXSTATE_OLD:
65		if (data > cpu_max_ext_state_size - sizeof(union savefpu)) {
66			error = EINVAL;
67			break;
68		}
69		savefpu = malloc(data, M_TEMP, M_WAITOK);
70		error = copyin(addr, savefpu, data);
71		if (error == 0) {
72			npxgetregs(td);
73			error = npxsetxstate(td, savefpu, data);
74		}
75		free(savefpu, M_TEMP);
76		break;
77
78	case PT_GETXSTATE_INFO:
79		if (data != sizeof(info)) {
80			error  = EINVAL;
81			break;
82		}
83		info.xsave_len = cpu_max_ext_state_size;
84		info.xsave_mask = xsave_mask;
85		error = copyout(&info, addr, data);
86		break;
87
88	case PT_GETXSTATE:
89		npxgetregs(td);
90		savefpu = (char *)(get_pcb_user_save_td(td));
91		error = copyout(savefpu, addr, cpu_max_ext_state_size);
92		break;
93
94	case PT_SETXSTATE:
95		if (data < sizeof(union savefpu) ||
96		    data > cpu_max_ext_state_size) {
97			error = EINVAL;
98			break;
99		}
100		savefpu = malloc(data, M_TEMP, M_WAITOK);
101		error = copyin(addr, savefpu, data);
102		if (error == 0)
103			error = npxsetregs(td, (union savefpu *)savefpu,
104			    savefpu + sizeof(union savefpu), data -
105			    sizeof(union savefpu));
106		free(savefpu, M_TEMP);
107		break;
108
109	default:
110		error = EINVAL;
111		break;
112	}
113
114	return (error);
115}
116#endif
117
118int
119cpu_ptrace(struct thread *td, int req, void *addr, int data)
120{
121#ifdef CPU_ENABLE_SSE
122	struct savexmm *fpstate;
123	int error;
124
125	if (!cpu_fxsr)
126		return (EINVAL);
127
128	fpstate = &get_pcb_user_save_td(td)->sv_xmm;
129	switch (req) {
130	case PT_GETXMMREGS:
131		npxgetregs(td);
132		error = copyout(fpstate, addr, sizeof(*fpstate));
133		break;
134
135	case PT_SETXMMREGS:
136		npxgetregs(td);
137		error = copyin(addr, fpstate, sizeof(*fpstate));
138		fpstate->sv_env.en_mxcsr &= cpu_mxcsr_mask;
139		break;
140
141	case PT_GETXSTATE_OLD:
142	case PT_SETXSTATE_OLD:
143	case PT_GETXSTATE_INFO:
144	case PT_GETXSTATE:
145	case PT_SETXSTATE:
146		error = cpu_ptrace_xstate(td, req, addr, data);
147		break;
148
149	default:
150		return (EINVAL);
151	}
152
153	return (error);
154#else
155	return (EINVAL);
156#endif
157}
158