00001 /* 00002 * Copyright (C) 2001-2004 Jakub Jermar 00003 * All rights reserved. 00004 * 00005 * Redistribution and use in source and binary forms, with or without 00006 * modification, are permitted provided that the following conditions 00007 * are met: 00008 * 00009 * - Redistributions of source code must retain the above copyright 00010 * notice, this list of conditions and the following disclaimer. 00011 * - Redistributions in binary form must reproduce the above copyright 00012 * notice, this list of conditions and the following disclaimer in the 00013 * documentation and/or other materials provided with the distribution. 00014 * - The name of the author may not be used to endorse or promote products 00015 * derived from this software without specific prior written permission. 00016 * 00017 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 00018 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 00019 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 00020 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 00021 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 00022 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 00023 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 00024 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 00025 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 00026 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 00027 */ 00028 00035 #ifndef __ia32_CONTEXT_H__ 00036 #define __ia32_CONTEXT_H__ 00037 00038 #include <arch/types.h> 00039 00040 #define STACK_ITEM_SIZE 4 00041 00042 /* 00043 * Both context_save() and context_restore() eat two doublewords from the stack. 00044 * First for pop of the saved register, second during ret instruction. 00045 * 00046 * One item is put onto stack to support get_stack_base(). 00047 */ 00048 #define SP_DELTA (8+STACK_ITEM_SIZE) 00049 00050 /* 00051 * Only save registers that must be preserved across 00052 * function calls. 00053 */ 00054 struct context { 00055 __address sp; 00056 __address pc; 00057 __u32 ebx; 00058 __u32 esi; 00059 __u32 edi; 00060 __u32 ebp; 00061 ipl_t ipl; 00062 } __attribute__ ((packed)); 00063 00064 #endif 00065