fibril.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 LIBC_ia64_FIBRIL_H_
#define LIBC_ia64_FIBRIL_H_

#include <sys/types.h>
#include <align.h>
#include <libarch/stack.h>
#include <libarch/types.h>

/*
 * context_save() and context_restore() are both leaf procedures.
 * No need to allocate scratch area.
 */
#define SP_DELTA        (0 + ALIGN_UP(STACK_ITEM_SIZE, STACK_ALIGNMENT))

#define PFM_MASK        (~0x3fffffffff)

#define PSTHREAD_INITIAL_STACK_PAGES_NO 2
/* Stack is divided into two equal parts (for memory stack and register stack). */
#define PSTHREAD_INITIAL_STACK_DIVISION 2  

#define context_set(c, _pc, stack, size, tls)                                                           \
        do {                                                                                            \
                (c)->pc = (uint64_t) _pc;                                                               \
                (c)->bsp = ((uint64_t) stack) + size / PSTHREAD_INITIAL_STACK_DIVISION;                                                         \
                (c)->ar_pfs &= PFM_MASK;                                                                \
                (c)->sp = ((uint64_t) stack) + ALIGN_UP((size / PSTHREAD_INITIAL_STACK_DIVISION), STACK_ALIGNMENT) - SP_DELTA;          \
                (c)->tp = (uint64_t) tls;                                                               \
        } while (0);
        

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

        /*
         * Application registers
         */
        uint64_t ar_pfs;
        uint64_t ar_unat_caller;
        uint64_t ar_unat_callee;
        uint64_t ar_rsc;
        uint64_t bsp;           /* ar_bsp */
        uint64_t ar_rnat;
        uint64_t ar_lc;

        /*
         * General registers
         */
        uint64_t r1;
        uint64_t r4;
        uint64_t r5;
        uint64_t r6;
        uint64_t r7;
        uint64_t sp;            /* r12 */
        uint64_t tp;            /* r13 */
        
        /*
         * Branch registers
         */
        uint64_t pc;            /* b0 */
        uint64_t b1;
        uint64_t b2;
        uint64_t b3;
        uint64_t b4;
        uint64_t b5;

        /*
         * Predicate registers
         */
        uint64_t pr;

        uint128_t f2 __attribute__ ((aligned(16)));
        uint128_t f3;
        uint128_t f4;
        uint128_t f5;

        uint128_t f16;
        uint128_t f17;
        uint128_t f18;
        uint128_t f19;
        uint128_t f20;
        uint128_t f21;
        uint128_t f22;
        uint128_t f23;
        uint128_t f24;
        uint128_t f25;
        uint128_t f26;
        uint128_t f27;
        uint128_t f28;
        uint128_t f29;
        uint128_t f30;
        uint128_t f31;

} context_t;

static inline uintptr_t context_get_fp(context_t *ctx)
{
        return 0;       /* FIXME */
}

#endif

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