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/*
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 * Copyright (c) 2007 Michal Kebrt, Petr Stepan
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 *
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 * All rights reserved.
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 *
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 * Redistribution and use in source and binary forms, with or without
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 * modification, are permitted provided that the following conditions
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 * are met:
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 *
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 * - Redistributions of source code must retain the above copyright
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 *   notice, this list of conditions and the following disclaimer.
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 * - Redistributions in binary form must reproduce the above copyright
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 *   notice, this list of conditions and the following disclaimer in the
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 *   documentation and/or other materials provided with the distribution.
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 * - The name of the author may not be used to endorse or promote products
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 *   derived from this software without specific prior written permission.
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 *
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 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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 */
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/** @addtogroup arm32  
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 * @{
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 */
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/** @file
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 *  @brief Exception declarations.
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 */
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#ifndef KERN_arm32_EXCEPTION_H_
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#define KERN_arm32_EXCEPTION_H_
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#include <arch/types.h>
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#include <arch/regutils.h>
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/** If defined, forces using of high exception vectors. */
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#define HIGH_EXCEPTION_VECTORS
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#ifdef HIGH_EXCEPTION_VECTORS
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    #define EXC_BASE_ADDRESS    0xffff0000
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#else
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    #define EXC_BASE_ADDRESS    0x0
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#endif
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/* Exception Vectors */
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#define EXC_RESET_VEC          (EXC_BASE_ADDRESS + 0x0)
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#define EXC_UNDEF_INSTR_VEC    (EXC_BASE_ADDRESS + 0x4)
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#define EXC_SWI_VEC            (EXC_BASE_ADDRESS + 0x8)
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#define EXC_PREFETCH_ABORT_VEC (EXC_BASE_ADDRESS + 0xc)
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#define EXC_DATA_ABORT_VEC     (EXC_BASE_ADDRESS + 0x10)
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#define EXC_IRQ_VEC            (EXC_BASE_ADDRESS + 0x18)
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#define EXC_FIQ_VEC            (EXC_BASE_ADDRESS + 0x1c)
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/* Exception numbers */
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#define EXC_RESET           0
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#define EXC_UNDEF_INSTR     1
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#define EXC_SWI             2
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#define EXC_PREFETCH_ABORT  3
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#define EXC_DATA_ABORT      4
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#define EXC_IRQ             5
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#define EXC_FIQ             6
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/** Kernel stack pointer.
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 *
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 * It is set when thread switches to user mode,
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 * and then used for exception handling.
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 */
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extern uintptr_t supervisor_sp;
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/** Temporary exception stack pointer.
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 *
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 * Temporary stack is used in exceptions handling routines
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 * before switching to thread's kernel stack.
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 */
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extern uintptr_t exc_stack;
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/** Struct representing CPU state saved when an exception occurs. */
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typedef struct {
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    uint32_t spsr;
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    uint32_t sp;
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    uint32_t lr;
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    uint32_t r0;
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    uint32_t r1;
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    uint32_t r2;
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    uint32_t r3;
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    uint32_t r4;
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    uint32_t r5;
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    uint32_t r6;
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    uint32_t r7;
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    uint32_t r8;
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    uint32_t r9;
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    uint32_t r10;
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    uint32_t r11;
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    uint32_t r12;
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    uint32_t pc;
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} istate_t;
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/** Sets Program Counter member of given istate structure.
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 *
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 * @param istate istate structure
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 * @param retaddr new value of istate's PC member
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 */
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static inline void istate_set_retaddr(istate_t *istate, uintptr_t retaddr)
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{
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    istate->pc = retaddr;
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}
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/** Returns true if exception happened while in userspace. */
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static inline int istate_from_uspace(istate_t *istate)
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{
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    return (istate->spsr & STATUS_REG_MODE_MASK) == USER_MODE;
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}
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/** Returns Program Counter member of given istate structure. */
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static inline unative_t istate_get_pc(istate_t *istate)
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{
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    return istate->pc;
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}
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extern void install_exception_handlers(void);
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extern void exception_init(void);
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extern void print_istate(istate_t *istate);
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extern void reset_exception_entry(void);
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extern void irq_exception_entry(void);
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extern void fiq_exception_entry(void);
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extern void undef_instr_exception_entry(void);
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extern void prefetch_abort_exception_entry(void);
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extern void data_abort_exception_entry(void);
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extern void swi_exception_entry(void);
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#endif
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/** @}
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 */