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 * $FreeBSD: releng/11.0/sys/arm64/include/setjmp.h 292659 2015-12-23 15:22:44Z andrew $
31 */
32
33#ifndef _MACHINE_SETJMP_H_
34#define	_MACHINE_SETJMP_H_
35
36#include <sys/cdefs.h>
37
38/*
39 * We need to store:
40 *  - A magic value to differentiate the buffers
41 *  - The stack pointer
42 *  - The link register
43 *  - 11 general purpose registers
44 *  - 8 floating point registers
45 *  - The signal mask (128 bits)
46 * i.e. 24 64-bit words, round this up to 31(+1) 128-bit words to allow for
47 * CPU extensions with larger registers and stronger alignment requirements.
48 *
49 * The registers to save are: r19 to r29, and d8 to d15.
50 */
51#define	_JBLEN		31
52#define	_JB_SIGMASK	21
53
54/* This should only be needed in libc and may change */
55#ifdef __ASSEMBLER__
56#define	_JB_MAGIC__SETJMP	0xfb5d25837d7ff700
57#define	_JB_MAGIC_SETJMP	0xfb5d25837d7ff701
58#endif
59
60#ifndef __ASSEMBLER__
61/*
62 * jmp_buf and sigjmp_buf are encapsulated in different structs to force
63 * compile-time diagnostics for mismatches.  The structs are the same
64 * internally to avoid some run-time errors for mismatches.
65 */
66#if __BSD_VISIBLE || __POSIX_VISIBLE || __XSI_VISIBLE
67typedef struct _sigjmp_buf { __int128_t _sjb[_JBLEN + 1]; } sigjmp_buf[1];
68#endif
69
70typedef struct _jmp_buf { __int128_t _jb[_JBLEN + 1]; } jmp_buf[1];
71#endif /* __ASSEMBLER__ */
72
73#endif /* !_MACHINE_SETJMP_H_ */
74