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1 | jermar | 1 | /* |
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 | |||
29 | #ifndef __CONTEXT_H__ |
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30 | #define __CONTEXT_H__ |
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31 | |||
97 | jermar | 32 | #include <arch/types.h> |
1 | jermar | 33 | #include <typedefs.h> |
414 | jermar | 34 | #include <arch/context.h> |
1 | jermar | 35 | |
414 | jermar | 36 | |
97 | jermar | 37 | #ifndef context_set |
38 | #define context_set(c, _pc, stack, size) \ |
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39 | (c)->pc = (__address) (_pc); \ |
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40 | (c)->sp = ((__address) (stack)) + (size) - SP_DELTA; |
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41 | #endif /* context_set */ |
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52 | vana | 42 | |
414 | jermar | 43 | extern int context_save_arch(context_t *c); |
44 | extern void context_restore_arch(context_t *c) __attribute__ ((noreturn)); |
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1 | jermar | 45 | |
414 | jermar | 46 | /** Save register context. |
47 | * |
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48 | * Save current register context (including stack pointers) |
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49 | * to context structure. |
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50 | * |
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51 | * Note that call to context_restore() will return at the same |
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52 | * address as the corresponding call to context_save(). |
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53 | * |
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54 | * @param c Context structure. |
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55 | * |
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56 | * @return context_save() returns 1, context_restore() returns 0. |
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57 | */ |
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58 | static inline int context_save(context_t *c) |
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59 | { |
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60 | return context_save_arch(c); |
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61 | } |
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62 | |||
63 | /** Restore register context. |
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64 | * |
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65 | * Restore previously saved register context (including stack pointers) |
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66 | * from context structure. |
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67 | * |
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68 | * Note that this function does not normally return. |
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69 | * Instead, it returns at the same address as the |
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70 | * corresponding call to context_save(), the only |
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71 | * difference being return value. |
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72 | * |
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73 | * Note that content of any local variable defined by |
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74 | * the caller of context_save() is undefined after |
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75 | * context_restore(). |
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76 | * |
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77 | * @param c Context structure. |
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78 | */ |
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79 | static inline void context_restore(context_t *c) |
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80 | { |
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81 | context_restore_arch(c); |
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82 | } |
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83 | |||
1 | jermar | 84 | #endif |