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| Rev | Author | Line No. | Line |
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| 2128 | jermar | 1 | /* |
| 2465 | jermar | 2 | * Copyright (c) 2007 Michal Kebrt, Petr Stepan |
| 3 | * |
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| 2128 | jermar | 4 | * All rights reserved. |
| 5 | * |
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| 6 | * Redistribution and use in source and binary forms, with or without |
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| 7 | * modification, are permitted provided that the following conditions |
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| 8 | * are met: |
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| 9 | * |
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| 10 | * - Redistributions of source code must retain the above copyright |
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| 11 | * notice, this list of conditions and the following disclaimer. |
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| 12 | * - Redistributions in binary form must reproduce the above copyright |
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| 13 | * notice, this list of conditions and the following disclaimer in the |
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| 14 | * documentation and/or other materials provided with the distribution. |
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| 15 | * - The name of the author may not be used to endorse or promote products |
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| 16 | * derived from this software without specific prior written permission. |
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| 17 | * |
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| 18 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
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| 19 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
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| 20 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
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| 21 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
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| 22 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
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| 23 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
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| 24 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
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| 25 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
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| 26 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
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| 27 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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| 28 | */ |
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| 29 | |||
| 30 | /** @addtogroup arm32 |
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| 31 | * @{ |
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| 32 | */ |
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| 33 | /** @file |
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| 2465 | jermar | 34 | * @brief Exception declarations. |
| 2128 | jermar | 35 | */ |
| 36 | |||
| 37 | #ifndef KERN_arm32_EXCEPTION_H_ |
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| 38 | #define KERN_arm32_EXCEPTION_H_ |
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| 39 | |||
| 40 | #include <arch/types.h> |
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| 2465 | jermar | 41 | #include <arch/regutils.h> |
| 2128 | jermar | 42 | |
| 2465 | jermar | 43 | /** If defined, forces using of high exception vectors. */ |
| 44 | #define HIGH_EXCEPTION_VECTORS |
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| 45 | |||
| 46 | #ifdef HIGH_EXCEPTION_VECTORS |
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| 47 | #define EXC_BASE_ADDRESS 0xffff0000 |
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| 48 | #else |
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| 49 | #define EXC_BASE_ADDRESS 0x0 |
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| 50 | #endif |
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| 51 | |||
| 52 | /* Exception Vectors */ |
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| 53 | #define EXC_RESET_VEC (EXC_BASE_ADDRESS + 0x0) |
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| 54 | #define EXC_UNDEF_INSTR_VEC (EXC_BASE_ADDRESS + 0x4) |
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| 55 | #define EXC_SWI_VEC (EXC_BASE_ADDRESS + 0x8) |
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| 56 | #define EXC_PREFETCH_ABORT_VEC (EXC_BASE_ADDRESS + 0xc) |
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| 57 | #define EXC_DATA_ABORT_VEC (EXC_BASE_ADDRESS + 0x10) |
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| 58 | #define EXC_IRQ_VEC (EXC_BASE_ADDRESS + 0x18) |
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| 59 | #define EXC_FIQ_VEC (EXC_BASE_ADDRESS + 0x1c) |
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| 60 | |||
| 61 | /* Exception numbers */ |
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| 62 | #define EXC_RESET 0 |
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| 63 | #define EXC_UNDEF_INSTR 1 |
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| 64 | #define EXC_SWI 2 |
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| 65 | #define EXC_PREFETCH_ABORT 3 |
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| 66 | #define EXC_DATA_ABORT 4 |
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| 67 | #define EXC_IRQ 5 |
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| 68 | #define EXC_FIQ 6 |
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| 69 | |||
| 70 | |||
| 71 | /** Kernel stack pointer. |
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| 72 | * |
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| 73 | * It is set when thread switches to user mode, |
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| 74 | * and then used for exception handling. |
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| 75 | */ |
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| 76 | extern uintptr_t supervisor_sp; |
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| 77 | |||
| 78 | |||
| 79 | /** Temporary exception stack pointer. |
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| 80 | * |
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| 81 | * Temporary stack is used in exceptions handling routines |
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| 82 | * before switching to thread's kernel stack. |
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| 83 | */ |
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| 84 | extern uintptr_t exc_stack; |
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| 85 | |||
| 86 | |||
| 87 | /** Struct representing CPU state saved when an exception occurs. */ |
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| 2128 | jermar | 88 | typedef struct { |
| 2465 | jermar | 89 | uint32_t spsr; |
| 90 | uint32_t sp; |
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| 91 | uint32_t lr; |
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| 92 | |||
| 93 | uint32_t r0; |
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| 94 | uint32_t r1; |
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| 95 | uint32_t r2; |
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| 96 | uint32_t r3; |
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| 97 | uint32_t r4; |
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| 98 | uint32_t r5; |
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| 99 | uint32_t r6; |
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| 100 | uint32_t r7; |
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| 101 | uint32_t r8; |
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| 102 | uint32_t r9; |
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| 103 | uint32_t r10; |
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| 104 | uint32_t r11; |
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| 105 | uint32_t r12; |
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| 106 | |||
| 107 | uint32_t pc; |
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| 2128 | jermar | 108 | } istate_t; |
| 109 | |||
| 2465 | jermar | 110 | |
| 111 | /** Sets Program Counter member of given istate structure. |
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| 112 | * |
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| 113 | * @param istate istate structure |
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| 114 | * @param retaddr new value of istate's PC member |
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| 115 | */ |
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| 2128 | jermar | 116 | static inline void istate_set_retaddr(istate_t *istate, uintptr_t retaddr) |
| 117 | { |
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| 2465 | jermar | 118 | istate->pc = retaddr; |
| 2128 | jermar | 119 | } |
| 120 | |||
| 2465 | jermar | 121 | |
| 122 | /** Returns true if exception happened while in userspace. */ |
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| 2128 | jermar | 123 | static inline int istate_from_uspace(istate_t *istate) |
| 124 | { |
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| 2465 | jermar | 125 | return (istate->spsr & STATUS_REG_MODE_MASK) == USER_MODE; |
| 2128 | jermar | 126 | } |
| 2465 | jermar | 127 | |
| 128 | |||
| 129 | /** Returns Program Counter member of given istate structure. */ |
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| 2128 | jermar | 130 | static inline unative_t istate_get_pc(istate_t *istate) |
| 131 | { |
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| 2465 | jermar | 132 | return istate->pc; |
| 2128 | jermar | 133 | } |
| 134 | |||
| 2465 | jermar | 135 | |
| 136 | extern void install_exception_handlers(void); |
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| 137 | extern void exception_init(void); |
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| 138 | extern void print_istate(istate_t *istate); |
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| 139 | |||
| 140 | |||
| 2128 | jermar | 141 | #endif |
| 142 | |||
| 143 | /** @} |
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| 144 | */ |