1/*
2 * Copyright (C) 2010 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.
34 * Do not modify this value or you will break the ABI !
35 *
36 * This value comes from the original OpenBSD ARM-specific header
37 * that was replaced by this one.
38 */
39#define _JBLEN  64
40
41/* According to the ARM AAPCS document, we only need to save
42 * the following registers:
43 *
44 *  Core   r4-r14
45 *
46 *  VFP    d8-d15  (see section 5.1.2.1)
47 *
48 *      Registers s16-s31 (d8-d15, q4-q7) must be preserved across subroutine
49 *      calls; registers s0-s15 (d0-d7, q0-q3) do not need to be preserved
50 *      (and can be used for passing arguments or returning results in standard
51 *      procedure-call variants). Registers d16-d31 (q8-q15), if present, do
52 *      not need to be preserved.
53 *
54 *  FPSCR  saved because GLibc does saves it too.
55 *
56 */
57
58/* The internal structure of a jmp_buf is totally private.
59 * Current layout (may change in the future):
60 *
61 * word   name         description
62 * 0      magic        magic number
63 * 1      sigmask      signal mask (not used with _setjmp / _longjmp)
64 * 2      float_base   base of float registers (d8 to d15)
65 * 18     float_state  floating-point status and control register
66 * 19     core_base    base of core registers (r4 to r14)
67 * 30     reserved     reserved entries (room to grow)
68 * 64
69 *
70 * NOTE: float_base must be at an even word index, since the
71 *       FP registers will be loaded/stored with instructions
72 *       that expect 8-byte alignment.
73 */
74
75#define _JB_MAGIC       0
76#define _JB_SIGMASK     (_JB_MAGIC+1)
77#define _JB_FLOAT_BASE  (_JB_SIGMASK+1)
78#define _JB_FLOAT_STATE (_JB_FLOAT_BASE + (15-8+1)*2)
79#define _JB_CORE_BASE   (_JB_FLOAT_STATE+1)
80
81#define _JB_MAGIC__SETJMP	0x4278f500
82#define _JB_MAGIC_SETJMP	0x4278f501
83