FreeBSD/Linux Kernel Cross Reference
sys/arm64/include/setjmp.h

     /*-
      * Copyright (c) 2014 Andrew Turner
      * Copyright (c) 2014-2015 The FreeBSD Foundation
      * All rights reserved.
      *
      * This software was developed by Andrew Turner under
      * sponsorship from the FreeBSD Foundation.
      *
      * Redistribution and use in source and binary forms, with or without
     * modification, are permitted provided that the following conditions
     * are met:
     * 1. Redistributions of source code must retain the above copyright
     *    notice, this list of conditions and the following disclaimer.
     * 2. Redistributions in binary form must reproduce the above copyright
     *    notice, this list of conditions and the following disclaimer in the
     *    documentation and/or other materials provided with the distribution.
     *
     * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
     * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
     * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     * SUCH DAMAGE.
     *
     * $FreeBSD: releng/11.2/sys/arm64/include/setjmp.h 292659 2015-12-23 15:22:44Z andrew $
     */
    
    #ifndef _MACHINE_SETJMP_H_
    #define _MACHINE_SETJMP_H_
    
    #include <sys/cdefs.h>
    
    /*
     * We need to store:
     *  - A magic value to differentiate the buffers
     *  - The stack pointer
     *  - The link register
     *  - 11 general purpose registers
     *  - 8 floating point registers
     *  - The signal mask (128 bits)
     * i.e. 24 64-bit words, round this up to 31(+1) 128-bit words to allow for
     * CPU extensions with larger registers and stronger alignment requirements.
     *
     * The registers to save are: r19 to r29, and d8 to d15.
     */
    #define _JBLEN          31
    #define _JB_SIGMASK     21
    
    /* This should only be needed in libc and may change */
    #ifdef __ASSEMBLER__
    #define _JB_MAGIC__SETJMP       0xfb5d25837d7ff700
    #define _JB_MAGIC_SETJMP        0xfb5d25837d7ff701
    #endif
    
    #ifndef __ASSEMBLER__
    /*
     * jmp_buf and sigjmp_buf are encapsulated in different structs to force
     * compile-time diagnostics for mismatches.  The structs are the same
     * internally to avoid some run-time errors for mismatches.
     */
    #if __BSD_VISIBLE || __POSIX_VISIBLE || __XSI_VISIBLE
    typedef struct _sigjmp_buf { __int128_t _sjb[_JBLEN + 1]; } sigjmp_buf[1];
    #endif
    
    typedef struct _jmp_buf { __int128_t _jb[_JBLEN + 1]; } jmp_buf[1];
    #endif /* __ASSEMBLER__ */
    
    #endif /* !_MACHINE_SETJMP_H_ */

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