0,0 → 1,96 |
/* |
* Copyright (c) 2007 Petr Stepan |
* All rights reserved. |
* |
* Redistribution and use in source and binary forms, with or without |
* modification, are permitted provided that the following conditions |
* are met: |
* |
* - Redistributions of source code must retain the above copyright |
* notice, this list of conditions and the following disclaimer. |
* - Redistributions in binary form must reproduce the above copyright |
* notice, this list of conditions and the following disclaimer in the |
* documentation and/or other materials provided with the distribution. |
* - The name of the author may not be used to endorse or promote products |
* derived from this software without specific prior written permission. |
* |
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
*/ |
|
/** @addtogroup arm32 |
* @{ |
*/ |
/** @file |
@brief Exception handlers and exception initialization routines. |
*/ |
|
#include <arch/exception.h> |
#include "aux_print/printf.h" |
#include <arch/memstr.h> |
|
#define PREFETCH_OFFSET 0x8 |
#define BRANCH_OPCODE 0xea000000 |
#define VALID_BRANCH_MASK 0xff000000 |
|
/** Updates specified exception vector to jump to given handler. |
*/ |
static void install_handler (unsigned* handler, unsigned* vector) { |
volatile unsigned vec; |
|
/* calculate relative distance */ |
vec = ((unsigned)handler - (unsigned)vector - PREFETCH_OFFSET); |
|
/* word offset */ |
vec >>= 2; |
|
/* check if haven't jumped beyond 32 MB */ |
if ((vec & VALID_BRANCH_MASK) != 0) { |
/*panic("exception handler beyond 32MB.");*/ |
return; |
} |
|
/* make it branch instruction */ |
vec |= BRANCH_OPCODE; |
*vector = vec; |
|
aux_printf("installed handler to %p, to vector %p\n.", handler, vector); |
} |
|
/* TODO add other exception handlers */ |
static void dummy_exception(){ |
asm("bkpt"); |
} |
|
/** IRQ Exception handler */ |
static void irq_exception(){ |
asm("bkpt"); |
} |
|
/** Fills exception vectors with appropriate exception handlers. |
*/ |
void install_exception_handlers(void) { |
install_handler((unsigned*)dummy_exception, (unsigned*)EXC_RESET_VEC); |
install_handler((unsigned*)dummy_exception, (unsigned*)EXC_UNDEF_INSTR_VEC); |
install_handler((unsigned*)dummy_exception, (unsigned*)EXC_SWI_VEC); |
install_handler((unsigned*)dummy_exception, (unsigned*)EXC_PREFETCH_ABORT_VEC); |
install_handler((unsigned*)dummy_exception, (unsigned*)EXC_DATA_ABORT_VEC); |
install_handler((unsigned*)irq_exception, (unsigned*)EXC_IRQ_VEC); |
install_handler((unsigned*)dummy_exception, (unsigned*)EXC_FIQ_VEC); |
} |
|
/** Registers exceptions and their handlers to kernel exception dispatcher. */ |
void exception_init(void){ |
/* TODO */ |
} |
|
/** @} |
*/ |