1/*-
2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
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/cdefs.h>
30__FBSDID("$FreeBSD$");
31
32#include <sys/types.h>
33#include <sys/ucontext.h>
34#include <errno.h>
35#include <stdlib.h>
36#include <machine/sysarch.h>
37
38struct ucontextx {
39	ucontext_t	ucontext;
40	mcontext_vfp_t	mcontext_vfp;
41};
42
43int
44__getcontextx_size(void)
45{
46
47	return (sizeof(struct ucontextx));
48}
49
50int
51__fillcontextx2(char *ctx)
52{
53	struct ucontextx *ucxp;
54	ucontext_t	 *ucp;
55	mcontext_vfp_t	 *mvp;
56	struct arm_get_vfpstate_args vfp_arg;
57
58	ucxp = (struct ucontextx *)ctx;
59	ucp = &ucxp->ucontext;
60	mvp = &ucxp->mcontext_vfp;
61
62	vfp_arg.mc_vfp_size = sizeof(mcontext_vfp_t);
63	vfp_arg.mc_vfp = mvp;
64	if (sysarch(ARM_GET_VFPSTATE, &vfp_arg) == -1)
65			return (-1);
66	ucp->uc_mcontext.mc_vfp_size = sizeof(mcontext_vfp_t);
67	ucp->uc_mcontext.mc_vfp_ptr = mvp;
68	return (0);
69}
70
71int
72__fillcontextx(char *ctx)
73{
74	struct ucontextx *ucxp;
75
76	ucxp = (struct ucontextx *)ctx;
77	if (getcontext(&ucxp->ucontext) == -1)
78		return (-1);
79	__fillcontextx2(ctx);
80	return (0);
81}
82
83__weak_reference(__getcontextx, getcontextx);
84
85ucontext_t *
86__getcontextx(void)
87{
88	char *ctx;
89	int error;
90
91	ctx = malloc(__getcontextx_size());
92	if (ctx == NULL)
93		return (NULL);
94	if (__fillcontextx(ctx) == -1) {
95		error = errno;
96		free(ctx);
97		errno = error;
98		return (NULL);
99	}
100	return ((ucontext_t *)ctx);
101}
102