fibril.h

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/*
 * Copyright (c) 2006 Martin Decky
 * 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_ppc32_FIBRIL_H_
#define LIBC_ppc32_FIBRIL_H_

#include <sys/types.h>

/* We define our own context_set, because we need to set
 * the TLS pointer to the tcb+0x7000
 *
 * See tls_set in thread.h
 */
#define context_set(c, _pc, stack, size, ptls)                  \
        (c)->pc = (sysarg_t) (_pc);                             \
        (c)->sp = ((sysarg_t) (stack)) + (size) - SP_DELTA;     \
        (c)->tls = ((sysarg_t) (ptls)) + 0x7000 + sizeof(tcb_t);

#define SP_DELTA        16

typedef struct {
        uint32_t sp;
        uint32_t pc;
        
        uint32_t tls;
        uint32_t r13;
        uint32_t r14;
        uint32_t r15;
        uint32_t r16;
        uint32_t r17;
        uint32_t r18;
        uint32_t r19;
        uint32_t r20;
        uint32_t r21;
        uint32_t r22;
        uint32_t r23;
        uint32_t r24;
        uint32_t r25;
        uint32_t r26;
        uint32_t r27;
        uint32_t r28;
        uint32_t r29;
        uint32_t r30;
        uint32_t r31;
        
        uint32_t cr;
} __attribute__ ((packed)) context_t;

static inline uintptr_t context_get_fp(context_t *ctx)
{
        return ctx->sp;
}

#endif

---