1/*-
 2 * Copyright (c) 2014 Andrew Turner
 3 * Copyright (c) 2014-2015 The FreeBSD Foundation
 4 * All rights reserved.
 5 *
 6 * This software was developed by Andrew Turner under
 7 * sponsorship from the FreeBSD Foundation.
 8 *
 9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
11 * are met:
12 * 1. Redistributions of source code must retain the above copyright
13 *    notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 *    notice, this list of conditions and the following disclaimer in the
16 *    documentation and/or other materials provided with the distribution.
17 *
18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
19 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
21 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
24 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
25 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
26 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
27 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
28 * SUCH DAMAGE.
29 */
30
31#ifdef __arm__
32#include <arm/setjmp.h>
33#else /* !__arm__ */
34
35#ifndef _MACHINE_SETJMP_H_
36#define	_MACHINE_SETJMP_H_
37
38#include <sys/cdefs.h>
39
40/*
41 * We need to store:
42 *  - A magic value to differentiate the buffers
43 *  - The stack pointer
44 *  - The link register
45 *  - 11 general purpose registers
46 *  - 8 floating point registers
47 *  - The signal mask (128 bits)
48 * i.e. 24 64-bit words, round this up to 31(+1) 128-bit words to allow for
49 * CPU extensions with larger registers and stronger alignment requirements.
50 *
51 * The registers to save are: r19 to r29, and d8 to d15.
52 */
53#define	_JBLEN		31
54#define	_JB_SIGMASK	22
55
56/* This should only be needed in libc and may change */
57#ifdef __ASSEMBLER__
58#define	_JB_MAGIC__SETJMP	0xfb5d25837d7ff700
59#define	_JB_MAGIC_SETJMP	0xfb5d25837d7ff701
60#endif
61
62#ifndef __ASSEMBLER__
63/*
64 * jmp_buf and sigjmp_buf are encapsulated in different structs to force
65 * compile-time diagnostics for mismatches.  The structs are the same
66 * internally to avoid some run-time errors for mismatches.
67 */
68#if __BSD_VISIBLE || __POSIX_VISIBLE || __XSI_VISIBLE
69typedef struct _sigjmp_buf { __int128_t _sjb[_JBLEN + 1]; } sigjmp_buf[1];
70#endif
71
72typedef struct _jmp_buf { __int128_t _jb[_JBLEN + 1]; } jmp_buf[1];
73#endif /* __ASSEMBLER__ */
74
75#endif /* !_MACHINE_SETJMP_H_ */
76
77#endif /* !__arm__ */