1/*-
2 * SPDX-License-Identifier: BSD-2-Clause
3 *
4 * Copyright (c) 2017 Michal Meloun <mmel@FreeBSD.org>
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 *
11 * 1. Redistributions of source code must retain the above copyright
12 *    notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 *    notice, this list of conditions and the following disclaimer in the
15 *    documentation and/or other materials provided with the distribution.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
18 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
19 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
20 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
21 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
22 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27 */
28
29#include <sys/types.h>
30#include <sys/ucontext.h>
31#include <errno.h>
32#include <stdlib.h>
33#include <machine/sysarch.h>
34
35struct ucontextx {
36	ucontext_t	ucontext;
37	mcontext_vfp_t	mcontext_vfp;
38};
39
40int
41__getcontextx_size(void)
42{
43
44	return (sizeof(struct ucontextx));
45}
46
47int
48__fillcontextx2(char *ctx)
49{
50	struct ucontextx *ucxp;
51	ucontext_t	 *ucp;
52	mcontext_vfp_t	 *mvp;
53	struct arm_get_vfpstate_args vfp_arg;
54
55	ucxp = (struct ucontextx *)ctx;
56	ucp = &ucxp->ucontext;
57	mvp = &ucxp->mcontext_vfp;
58
59	vfp_arg.mc_vfp_size = sizeof(mcontext_vfp_t);
60	vfp_arg.mc_vfp = mvp;
61	if (sysarch(ARM_GET_VFPSTATE, &vfp_arg) == -1)
62			return (-1);
63	ucp->uc_mcontext.mc_vfp_size = sizeof(mcontext_vfp_t);
64	ucp->uc_mcontext.mc_vfp_ptr = mvp;
65	return (0);
66}
67
68int
69__fillcontextx(char *ctx)
70{
71	struct ucontextx *ucxp;
72
73	ucxp = (struct ucontextx *)ctx;
74	if (getcontext(&ucxp->ucontext) == -1)
75		return (-1);
76	__fillcontextx2(ctx);
77	return (0);
78}
79
80__weak_reference(__getcontextx, getcontextx);
81
82ucontext_t *
83__getcontextx(void)
84{
85	char *ctx;
86	int error;
87
88	ctx = malloc(__getcontextx_size());
89	if (ctx == NULL)
90		return (NULL);
91	if (__fillcontextx(ctx) == -1) {
92		error = errno;
93		free(ctx);
94		errno = error;
95		return (NULL);
96	}
97	return ((ucontext_t *)ctx);
98}
99