context.h

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/*
 * Copyright (C) 2005 Jakub Jermar
 * 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.
 */

#ifndef __ia64_CONTEXT_H__
#define __ia64_CONTEXT_H__

#include <arch/types.h>
#include <arch/register.h>
#include <typedefs.h>
#include <align.h>
#include <arch/stack.h>

/*
 * context_save_arch() and context_restore_arch() are both leaf procedures.
 * No need to allocate scratch area.
 *
 * One item is put onto the stack to support get_stack_base().
 */
#define SP_DELTA        (0+ALIGN_UP(STACK_ITEM_SIZE, STACK_ALIGNMENT))

#ifdef context_set
#undef context_set
#endif

/* RSE stack starts at the bottom of memory stack. */
#define context_set(c, _pc, stack, size)                                                                \
        do {                                                                                            \
                (c)->pc = (__address) _pc;                                                              \
                (c)->bsp = ((__address) stack) + ALIGN_UP((size), REGISTER_STACK_ALIGNMENT);            \
                (c)->ar_pfs &= PFM_MASK;                                                                \
                (c)->sp = ((__address) stack) + ALIGN_UP((size), STACK_ALIGNMENT) - SP_DELTA;           \
        } while (0);

/*
 * Only save registers that must be preserved across
 * function calls.
 */
struct context {

        /*
         * Application registers
         */
        __u64 ar_pfs;
        __u64 ar_unat_caller;
        __u64 ar_unat_callee;
        __u64 ar_rsc;
        __address bsp;          /* ar_bsp */
        __u64 ar_rnat;
        __u64 ar_lc;

        /*
         * General registers
         */
        __u64 r1;
        __u64 r4;
        __u64 r5;
        __u64 r6;
        __u64 r7;
        __address sp;           /* r12 */
        __u64 r13;
        
        /*
         * Branch registers
         */
        __address pc;           /* b0 */
        __u64 b1;
        __u64 b2;
        __u64 b3;
        __u64 b4;
        __u64 b5;

        /*
         * Predicate registers
         */
        __u64 pr;

        __r128 f2 __attribute__ ((aligned(16)));
        __r128 f3;
        __r128 f4;
        __r128 f5;

        __r128 f16;
        __r128 f17;
        __r128 f18;
        __r128 f19;
        __r128 f20;
        __r128 f21;
        __r128 f22;
        __r128 f23;
        __r128 f24;
        __r128 f25;
        __r128 f26;
        __r128 f27;
        __r128 f28;
        __r128 f29;
        __r128 f30;
        __r128 f31;
        
        ipl_t ipl;
};

#endif

---