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* Copyright (c) 2007 Michal Kebrt, Petr Stepan
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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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* - 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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* 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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* @brief Exception declarations.
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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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#define EXC_BASE_ADDRESS 0x0
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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_UNDEF_INSTR 1
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#define EXC_PREFETCH_ABORT 3
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#define EXC_DATA_ABORT 4
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/** Kernel stack pointer.
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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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extern uintptr_t supervisor_sp;
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/** Temporary exception stack pointer.
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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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extern uintptr_t exc_stack;
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/** Struct representing CPU state saved when an exception occurs. */
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/** Sets Program Counter member of given istate structure.
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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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static inline void istate_set_retaddr(istate_t *istate, uintptr_t retaddr)
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istate->pc = retaddr;
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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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return (istate->spsr & STATUS_REG_MODE_MASK) == USER_MODE;
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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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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);