vector.c

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/*
 * This file is part of the libopencm3 project.
 *
 * Copyright (C) 2010 Piotr Esden-Tempski <piotr@esden.net>,
 * Copyright (C) 2012 chrysn <chrysn@fsfe.org>
 *
 * This library is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this library. If not, see <http://www.gnu.org/licenses/>.
 */
 
#include <libopencm3/cm3/scb.h>
#include <libopencm3/cm3/vector.h>
 
/* load optional platform dependent initialization routines */
#include "../dispatch/vector_chipset.c"
/* load the weak symbols for IRQ_HANDLERS */
#include "../dispatch/vector_nvic.c"
 
/* Less common symbols exported by the linker script(s): */
typedef void (*funcp_t) (void);
extern funcp_t __preinit_array_start, __preinit_array_end;
extern funcp_t __init_array_start, __init_array_end;
extern funcp_t __fini_array_start, __fini_array_end;
 
int main(void);
void blocking_handler(void);
void null_handler(void);
 
__attribute__ ((section(".vectors")))
vector_table_t vector_table = {
        .initial_sp_value = &_stack,
        .reset = reset_handler,
        .nmi = nmi_handler,
        .hard_fault = hard_fault_handler,
 
/* Those are defined only on CM3 or CM4 */
#if defined(__ARM_ARCH_7M__) || defined(__ARM_ARCH_7EM__)
        .memory_manage_fault = mem_manage_handler,
        .bus_fault = bus_fault_handler,
        .usage_fault = usage_fault_handler,
        .debug_monitor = debug_monitor_handler,
#endif
 
        .sv_call = sv_call_handler,
        .pend_sv = pend_sv_handler,
        .systick = sys_tick_handler,
        .irq = {
                IRQ_HANDLERS
        }
};
 
void __attribute__ ((weak)) reset_handler(void)
{
        volatile unsigned *src, *dest;
        funcp_t *fp;
 
        for (src = &_data_loadaddr, dest = &_data;
                dest < &_edata;
                src++, dest++) {
                *dest = *src;
        }
 
        while (dest < &_ebss) {
                *dest++ = 0;
        }
 
        /* Ensure 8-byte alignment of stack pointer on interrupts */
        /* Enabled by default on most Cortex-M parts, but not M3 r1 */
        SCB_CCR |= SCB_CCR_STKALIGN;
 
        /* might be provided by platform specific vector.c */
        pre_main();
 
        /* Constructors. */
        for (fp = &__preinit_array_start; fp < &__preinit_array_end; fp++) {
                (*fp)();
        }
        for (fp = &__init_array_start; fp < &__init_array_end; fp++) {
                (*fp)();
        }
 
        /* Call the application's entry point. */
        (void)main();
 
        /* Destructors. */
        for (fp = &__fini_array_start; fp < &__fini_array_end; fp++) {
                (*fp)();
        }
 
}
 
void blocking_handler(void)
{
        while (1);
}
 
void null_handler(void)
{
        /* Do nothing. */
}
 
#pragma weak nmi_handler = null_handler
#pragma weak hard_fault_handler = blocking_handler
#pragma weak sv_call_handler = null_handler
#pragma weak pend_sv_handler = null_handler
#pragma weak sys_tick_handler = null_handler
 
/* Those are defined only on CM3 or CM4 */
#if defined(__ARM_ARCH_7M__) || defined(__ARM_ARCH_7EM__)
#pragma weak mem_manage_handler = blocking_handler
#pragma weak bus_fault_handler = blocking_handler
#pragma weak usage_fault_handler = blocking_handler
#pragma weak debug_monitor_handler = null_handler
#endif