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 * $FreeBSD$ 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, this can be rounded up to 32 to give us some 47 * space to expand into without affecting the ABI. 48 * XXX: Is this enough space for expansion? 49 * 50 * The registers to save are: r19 to r29, and d8 to d15. 51 */ 52 #define _JBLEN 32 53 #define _JB_SIGMASK 21 54 55 /* This should only be needed in libc and may change */ 56 #ifdef __ASSEMBLER__ 57 #define _JB_MAGIC__SETJMP 0xfb5d25837d7ff700 58 #define _JB_MAGIC_SETJMP 0xfb5d25837d7ff701 59 #endif 60 61 #ifndef __ASSEMBLER__ 62 /* 63 * jmp_buf and sigjmp_buf are encapsulated in different structs to force 64 * compile-time diagnostics for mismatches. The structs are the same 65 * internally to avoid some run-time errors for mismatches. 66 */ 67 #if __BSD_VISIBLE || __POSIX_VISIBLE || __XSI_VISIBLE 68 typedef struct _sigjmp_buf { long _sjb[_JBLEN + 1]; } sigjmp_buf[1]; 69 #endif 70 71 typedef struct _jmp_buf { long _jb[_JBLEN + 1]; } jmp_buf[1]; 72 #endif /* __ASSEMBLER__ */ 73 74 #endif /* !_MACHINE_SETJMP_H_ */ 75