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  1. /*
  2.  * Copyright (c) 2007 Michal Kebrt, Petr Stepan
  3.  *
  4.  * All rights reserved.
  5.  *
  6.  * Redistribution and use in source and binary forms, with or without
  7.  * modification, are permitted provided that the following conditions
  8.  * are met:
  9.  *
  10.  * - Redistributions of source code must retain the above copyright
  11.  *   notice, this list of conditions and the following disclaimer.
  12.  * - Redistributions in binary form must reproduce the above copyright
  13.  *   notice, this list of conditions and the following disclaimer in the
  14.  *   documentation and/or other materials provided with the distribution.
  15.  * - The name of the author may not be used to endorse or promote products
  16.  *   derived from this software without specific prior written permission.
  17.  *
  18.  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  19.  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  20.  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  21.  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  22.  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  23.  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  24.  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  25.  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  26.  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  27.  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  28.  */
  29.  
  30. /** @addtogroup arm32  
  31.  * @{
  32.  */
  33. /** @file
  34.  *  @brief Exception declarations.
  35.  */
  36.  
  37. #ifndef KERN_arm32_EXCEPTION_H_
  38. #define KERN_arm32_EXCEPTION_H_
  39.  
  40. #include <arch/types.h>
  41. #include <arch/regutils.h>
  42.  
  43. /** If defined, forces using of high exception vectors. */
  44. #define HIGH_EXCEPTION_VECTORS
  45.  
  46. #ifdef HIGH_EXCEPTION_VECTORS
  47.     #define EXC_BASE_ADDRESS    0xffff0000
  48. #else
  49.     #define EXC_BASE_ADDRESS    0x0
  50. #endif
  51.  
  52. /* Exception Vectors */
  53. #define EXC_RESET_VEC          (EXC_BASE_ADDRESS + 0x0)
  54. #define EXC_UNDEF_INSTR_VEC    (EXC_BASE_ADDRESS + 0x4)
  55. #define EXC_SWI_VEC            (EXC_BASE_ADDRESS + 0x8)
  56. #define EXC_PREFETCH_ABORT_VEC (EXC_BASE_ADDRESS + 0xc)
  57. #define EXC_DATA_ABORT_VEC     (EXC_BASE_ADDRESS + 0x10)
  58. #define EXC_IRQ_VEC            (EXC_BASE_ADDRESS + 0x18)
  59. #define EXC_FIQ_VEC            (EXC_BASE_ADDRESS + 0x1c)
  60.  
  61. /* Exception numbers */
  62. #define EXC_RESET           0
  63. #define EXC_UNDEF_INSTR     1
  64. #define EXC_SWI             2
  65. #define EXC_PREFETCH_ABORT  3
  66. #define EXC_DATA_ABORT      4
  67. #define EXC_IRQ             5
  68. #define EXC_FIQ             6
  69.  
  70.  
  71. /** Kernel stack pointer.
  72.  *
  73.  * It is set when thread switches to user mode,
  74.  * and then used for exception handling.
  75.  */
  76. extern uintptr_t supervisor_sp;
  77.  
  78.  
  79. /** Temporary exception stack pointer.
  80.  *
  81.  * Temporary stack is used in exceptions handling routines
  82.  * before switching to thread's kernel stack.
  83.  */
  84. extern uintptr_t exc_stack;
  85.  
  86.  
  87. /** Struct representing CPU state saved when an exception occurs. */
  88. typedef struct {
  89.     uint32_t spsr;
  90.     uint32_t sp;
  91.     uint32_t lr;
  92.  
  93.     uint32_t r0;
  94.     uint32_t r1;
  95.     uint32_t r2;
  96.     uint32_t r3;
  97.     uint32_t r4;
  98.     uint32_t r5;
  99.     uint32_t r6;
  100.     uint32_t r7;
  101.     uint32_t r8;
  102.     uint32_t r9;
  103.     uint32_t r10;
  104.     uint32_t r11;
  105.     uint32_t r12;
  106.  
  107.     uint32_t pc;
  108. } istate_t;
  109.  
  110.  
  111. /** Sets Program Counter member of given istate structure.
  112.  *
  113.  * @param istate istate structure
  114.  * @param retaddr new value of istate's PC member
  115.  */
  116. static inline void istate_set_retaddr(istate_t *istate, uintptr_t retaddr)
  117. {
  118.     istate->pc = retaddr;
  119. }
  120.  
  121.  
  122. /** Returns true if exception happened while in userspace. */
  123. static inline int istate_from_uspace(istate_t *istate)
  124. {
  125.     return (istate->spsr & STATUS_REG_MODE_MASK) == USER_MODE;
  126. }
  127.  
  128.  
  129. /** Returns Program Counter member of given istate structure. */
  130. static inline unative_t istate_get_pc(istate_t *istate)
  131. {
  132.     return istate->pc;
  133. }
  134.  
  135.  
  136. extern void install_exception_handlers(void);
  137. extern void exception_init(void);
  138. extern void print_istate(istate_t *istate);
  139. extern void reset_exception_entry(void);
  140. extern void irq_exception_entry(void);
  141. extern void fiq_exception_entry(void);
  142. extern void undef_instr_exception_entry(void);
  143. extern void prefetch_abort_exception_entry(void);
  144. extern void data_abort_exception_entry(void);
  145. extern void swi_exception_entry(void);
  146.  
  147.  
  148. #endif
  149.  
  150. /** @}
  151.  */
  152.