ptrace_machdep.c revision 276084 
1257853Sjmmv/*-
2257853Sjmmv * Copyright (c) 2005 Doug Rabson
3257853Sjmmv * 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 276084 2014-12-22 21:32:39Z 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	char *savefpu;
50	int error;
51
52	if (!use_xsave)
53		return (EOPNOTSUPP);
54
55	switch (req) {
56	case PT_GETXSTATE:
57		npxgetregs(td);
58		savefpu = (char *)(get_pcb_user_save_td(td) + 1);
59		error = copyout(savefpu, addr,
60		    cpu_max_ext_state_size - sizeof(union savefpu));
61		break;
62
63	case PT_SETXSTATE:
64		if (data > cpu_max_ext_state_size - sizeof(union savefpu)) {
65			error = EINVAL;
66			break;
67		}
68		savefpu = malloc(data, M_TEMP, M_WAITOK);
69		error = copyin(addr, savefpu, data);
70		if (error == 0) {
71			npxgetregs(td);
72			error = npxsetxstate(td, savefpu, data);
73		}
74		free(savefpu, M_TEMP);
75		break;
76
77	default:
78		error = EINVAL;
79		break;
80	}
81
82	return (error);
83}
84#endif
85
86int
87cpu_ptrace(struct thread *td, int req, void *addr, int data)
88{
89#ifdef CPU_ENABLE_SSE
90	struct savexmm *fpstate;
91	int error;
92
93	if (!cpu_fxsr)
94		return (EINVAL);
95
96	fpstate = &get_pcb_user_save_td(td)->sv_xmm;
97	switch (req) {
98	case PT_GETXMMREGS:
99		npxgetregs(td);
100		error = copyout(fpstate, addr, sizeof(*fpstate));
101		break;
102
103	case PT_SETXMMREGS:
104		npxgetregs(td);
105		error = copyin(addr, fpstate, sizeof(*fpstate));
106		fpstate->sv_env.en_mxcsr &= cpu_mxcsr_mask;
107		break;
108
109	case PT_GETXSTATE:
110	case PT_SETXSTATE:
111		error = cpu_ptrace_xstate(td, req, addr, data);
112		break;
113
114	default:
115		return (EINVAL);
116	}
117
118	return (error);
119#else
120	return (EINVAL);
121#endif
122}
123