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  1. /*
  2.  * Copyright (C) 2001-2004 Jakub Jermar
  3.  * All rights reserved.
  4.  *
  5.  * Redistribution and use in source and binary forms, with or without
  6.  * modification, are permitted provided that the following conditions
  7.  * are met:
  8.  *
  9.  * - Redistributions of source code must retain the above copyright
  10.  *   notice, this list of conditions and the following disclaimer.
  11.  * - Redistributions in binary form must reproduce the above copyright
  12.  *   notice, this list of conditions and the following disclaimer in the
  13.  *   documentation and/or other materials provided with the distribution.
  14.  * - The name of the author may not be used to endorse or promote products
  15.  *   derived from this software without specific prior written permission.
  16.  *
  17.  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  18.  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  19.  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  20.  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  21.  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  22.  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  23.  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  24.  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  25.  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  26.  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  27.  */
  28.  
  29. #ifndef __ia32_CONTEXT_H__
  30. #define __ia32_CONTEXT_H__
  31.  
  32. #include <arch/types.h>
  33.  
  34. #define STACK_ITEM_SIZE 4
  35.  
  36. /*
  37.  * Both context_save() and context_restore() eat two doublewords from the stack.
  38.  * First for pop of the saved register, second during ret instruction.
  39.  *
  40.  * One item is put onto stack to support get_stack_base().
  41.  */
  42. #define SP_DELTA    (8+STACK_ITEM_SIZE)
  43.  
  44. /*
  45.  * Only save registers that must be preserved across
  46.  * function calls.
  47.  */
  48. struct context {
  49.     __address sp;
  50.     __address pc;
  51.     __u32 ebx;
  52.     __u32 esi;
  53.     __u32 edi;
  54.     __u32 ebp;
  55.     ipl_t ipl;
  56. } __attribute__ ((packed));
  57.  
  58. #endif
  59.