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