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155 lines
4.6 KiB
C
155 lines
4.6 KiB
C
/*
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* Copyright (c) 2005, Swedish Institute of Computer Science
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the Institute nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* This file is part of the Contiki operating system.
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*
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* @(#)$Id: cooja_mtarch.c,v 1.5 2007/04/02 08:47:28 fros4943 Exp $
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*/
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#include <stdio.h>
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#include <string.h>
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#include "sys/cooja_mt.h"
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struct frame {
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unsigned long flags;
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unsigned long ebp;
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unsigned long edi;
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unsigned long esi;
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unsigned long edx;
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unsigned long ecx;
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unsigned long ebx;
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unsigned long eax;
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unsigned long retaddr;
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unsigned long retaddr2;
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unsigned long data;
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};
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/*--------------------------------------------------------------------------*/
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void
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cooja_mtarch_init(void)
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{
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}
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/*--------------------------------------------------------------------------*/
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void
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cooja_mtarch_start(struct cooja_mtarch_thread *t,
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void (*function)(void *), void *data)
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{
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struct frame *f = (struct frame *)&t->stack[COOJA_MTARCH_STACKSIZE - sizeof(struct frame)/4];
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int i;
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for(i = 0; i < COOJA_MTARCH_STACKSIZE; ++i) {
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t->stack[i] = i;
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}
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memset(f, 0, sizeof(struct frame));
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f->retaddr = (unsigned long)function;
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f->data = (unsigned long)data;
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t->sp = (unsigned long)&f->flags;
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f->ebp = (unsigned long)&f->eax;
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}
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/*--------------------------------------------------------------------------*/
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static struct cooja_mtarch_thread *cooja_running_thread;
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/*--------------------------------------------------------------------------*/
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void cooja_sw(void)
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{
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/* Store registers */
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__asm__ (
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"pushl %eax\n\t"
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"pushl %ebx\n\t"
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"pushl %ecx\n\t"
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"pushl %edx\n\t"
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"pushl %esi\n\t"
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"pushl %edi\n\t"
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"pushl %ebp\n\t"
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"pushl %ebp\n\t");
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/* Switch stack pointer */
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__asm__ ("movl %0, %%eax\n\t" : : "m" (cooja_running_thread));
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__asm__ (
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"movl 0(%eax), %ebx\n\t"
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"movl %esp, 0(%eax)\n\t"
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"movl %ebx, %esp\n\t"
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);
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/* Restore stored registers and return "our" way */
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__asm__ (
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"popl %ebp\n\t"
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"popl %ebp\n\t"
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"popl %edi\n\t"
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"popl %esi\n\t"
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"popl %edx\n\t"
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"popl %ecx\n\t"
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"popl %ebx\n\t"
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"popl %eax\n\t"
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"leave\n\t"
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"ret\n\t"
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);
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}
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/*--------------------------------------------------------------------------*/
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void
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cooja_mtarch_exec(struct cooja_mtarch_thread *t)
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{
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cooja_running_thread = t;
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cooja_sw();
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cooja_running_thread = NULL;
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}
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/*--------------------------------------------------------------------------*/
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void
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cooja_mtarch_remove(void)
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{
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}
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/*--------------------------------------------------------------------------*/
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void
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cooja_mtarch_yield(void)
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{
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cooja_sw();
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}
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/*--------------------------------------------------------------------------*/
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void
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cooja_mtarch_pstop(void)
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{
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}
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/*--------------------------------------------------------------------------*/
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void
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cooja_mtarch_pstart(void)
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{
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}
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/*--------------------------------------------------------------------------*/
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int
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cooja_mtarch_stack_usage(struct cooja_mt_thread *t)
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{
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int i;
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for(i = 0; i < COOJA_MTARCH_STACKSIZE; ++i) {
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if(t->thread.stack[i] != i) {
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return COOJA_MTARCH_STACKSIZE - i;
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}
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}
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return -1;
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}
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/*--------------------------------------------------------------------------*/
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