source: mainline/kernel/arch/amd64/include/context.h@ c0699467

/*
 * Copyright (c) 2005 Ondrej Palkovsky
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * - Redistributions of source code must retain the above copyright
 *   notice, this list of conditions and the following disclaimer.
 * - 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.
 * - The name of the author may not be used to endorse or promote products
 *   derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 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.
 */

/** @addtogroup amd64
 * @{
 */
/** @file
 */

#ifndef KERN_amd64_CONTEXT_H_
#define KERN_amd64_CONTEXT_H_

#include <typedefs.h>

/* According to ABI the stack MUST be aligned on 
 * 16-byte boundary. If it is not, the va_arg calling will
 * panic sooner or later
 */
#define SP_DELTA  16

#define context_set(c, _pc, stack, size) \
        do { \
                (c)->pc = (uintptr_t) (_pc); \
                (c)->sp = ((uintptr_t) (stack)) + (size) - SP_DELTA; \
                (c)->rbp = 0; \
        } while (0)

/* We include only registers that must be preserved
 * during function call
 */
typedef struct {
        uintptr_t sp;
        uintptr_t pc;
        
        uint64_t rbx;
        uint64_t rbp;
        
        uint64_t r12;
        uint64_t r13;
        uint64_t r14;
        uint64_t r15;
        
        ipl_t ipl;
} __attribute__ ((packed)) context_t;

#endif

/** @}
 */