source: mainline/uspace/lib/c/arch/arm32/include/libarch/fibril.h

/*
 * Copyright (c) 2007 Michal Kebrt
 * 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 libcarm32
 * @{
 */
/** @file
 *  @brief Fibrils related declarations.
 */

#ifndef _LIBC_arm32_FIBRIL_H_
#define _LIBC_arm32_FIBRIL_H_

#include <types/common.h>
#include <align.h>
#include <libarch/fibril_context.h>

/** Size of a stack item */
#define STACK_ITEM_SIZE  4

/** Stack alignment - see <a href="http://www.arm.com/support/faqdev/14269.html">ABI</a> for details */
#define STACK_ALIGNMENT  8

#define SP_DELTA  (0 + ALIGN_UP(STACK_ITEM_SIZE, STACK_ALIGNMENT))

/** Sets data to the context.
 *
 *  @param c     Context (#context_t).
 *  @param _pc   Program counter.
 *  @param stack Stack address.
 *  @param size  Stack size.
 *  @param ptls  Pointer to the TCB.
 */
#define context_set(c, _pc, stack, size, ptls) \
        do { \
                (c)->pc = (sysarg_t) (_pc); \
                (c)->sp = ((sysarg_t) (stack)) + (size) - SP_DELTA; \
                (c)->tls = ((sysarg_t)(ptls)) + ARCH_TP_OFFSET; \
                (c)->fp = 0; \
        } while (0)

static inline uintptr_t _context_get_fp(context_t *ctx)
{
        return ctx->fp;
}

#endif

/** @}
 */