| 1 | /*
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| 2 | * Copyright (c) 2001-2004 Jakub Jermar
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| 3 | * All rights reserved.
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| 4 | *
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| 5 | * Redistribution and use in source and binary forms, with or without
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| 6 | * modification, are permitted provided that the following conditions
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| 7 | * are met:
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| 8 | *
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| 9 | * - Redistributions of source code must retain the above copyright
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| 10 | * notice, this list of conditions and the following disclaimer.
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| 11 | * - Redistributions in binary form must reproduce the above copyright
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| 12 | * notice, this list of conditions and the following disclaimer in the
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| 13 | * documentation and/or other materials provided with the distribution.
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| 14 | * - The name of the author may not be used to endorse or promote products
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| 15 | * derived from this software without specific prior written permission.
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| 16 | *
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| 17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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| 18 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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| 19 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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| 20 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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| 21 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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| 22 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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| 23 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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| 24 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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| 25 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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| 26 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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| 27 | */
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| 28 |
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| 29 | /** @addtogroup ia32
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| 30 | * @{
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| 31 | */
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| 32 | /** @file
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| 33 | */
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| 34 |
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| 35 | #ifndef KERN_ia32_CONTEXT_H_
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| 36 | #define KERN_ia32_CONTEXT_H_
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| 37 |
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| 38 | #ifdef KERNEL
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| 39 |
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| 40 | #include <typedefs.h>
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| 41 |
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| 42 | #define STACK_ITEM_SIZE 4
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| 43 |
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| 44 | /*
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| 45 | * Both context_save() and context_restore() eat two doublewords from the stack.
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| 46 | * First for pop of the saved register, second during ret instruction.
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| 47 | *
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| 48 | * One item is put onto stack to support get_stack_base().
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| 49 | */
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| 50 | #define SP_DELTA (8 + STACK_ITEM_SIZE)
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| 51 |
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| 52 | #define context_set(c, _pc, stack, size) \
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| 53 | do { \
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| 54 | (c)->pc = (uintptr_t) (_pc); \
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| 55 | (c)->sp = ((uintptr_t) (stack)) + (size) - SP_DELTA; \
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| 56 | (c)->ebp = 0; \
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| 57 | } while (0)
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| 58 |
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| 59 | #endif /* KERNEL */
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| 60 |
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| 61 | /*
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| 62 | * Only save registers that must be preserved across
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| 63 | * function calls.
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| 64 | */
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| 65 | typedef struct {
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| 66 | uintptr_t sp;
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| 67 | uintptr_t pc;
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| 68 | uint32_t ebx;
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| 69 | uint32_t esi;
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| 70 | uint32_t edi;
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| 71 | uint32_t ebp;
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| 72 | ipl_t ipl;
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| 73 | } __attribute__ ((packed)) context_t;
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| 74 |
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| 75 | #endif
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| 76 |
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| 77 | /** @}
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| 78 | */
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