| 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 */ |
| } |
| |
| /** @} |
| */ |