1/*
2 * Copyright (C) 2013 The Android Open Source Project
3 * 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 *  * Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 *  * Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in
12 *    the documentation and/or other materials provided with the
13 *    distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
16 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
17 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
18 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
19 * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
21 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
22 * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
23 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
24 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
25 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 */
28
29/*
30 * machine/setjmp.h: machine dependent setjmp-related information.
31 */
32
33/* _JBLEN is the size of a jmp_buf in longs(64bit on AArch64) */
34#define _JBLEN 32
35
36/* According to AARCH64 PCS document we need to save the following
37 * registers:
38 *
39 * Core     x19 - x30, sp (see section 5.1.1)
40 * VFP      d8 - d15 (see section 5.1.2)
41 *
42 * NOTE: All the registers saved here will have 64bit vales (except FPSR).
43 *       AAPCS mandates that the higher part of q registers does not need to
44 *       be saveved by the callee.
45 */
46
47/* The structure of jmp_buf for AArch64:
48 *
49 * NOTE: _JBLEN is the size of jmp_buf in longs(64bit on AArch64)! The table
50 *      below computes the offsets in words(32bit).
51 *
52 *  word        name            description
53 *  0       magic           magic number
54 *  1       sigmask         signal mask (not used with _setjmp / _longjmp)
55 *  2       core_base       base of core registers (x19-x30, sp)
56 *  28      float_base      base of float registers (d8-d15)
57 *  44      reserved        reserved entries (room to grow)
58 *  64
59 *
60 *
61 *  NOTE: The instructions that load/store core/vfp registers expect 8-byte
62 *        alignment. Contrary to the previous setjmp header for ARM we do not
63 *        need to save status/control registers for VFP (it is not a
64 *        requirement for setjmp).
65 */
66
67#define _JB_MAGIC       0
68#define _JB_SIGMASK     (_JB_MAGIC+1)
69#define _JB_CORE_BASE   (_JB_SIGMASK+1)
70#define _JB_FLOAT_BASE  (_JB_CORE_BASE + (31-19+1)*2)
71
72#define _JB_MAGIC__SETJMP   0x53657200
73#define _JB_MAGIC_SETJMP    0x53657201
74