/*
 * Copyright (c) 2016, Alex Taradov <alex@taradov.com>
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * 1. Redistributions of source code must retain the above copyright notice,
 *    this list of conditions and the following disclaimer.
 * 2. 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.
 * 3. 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 COPYRIGHT HOLDERS AND CONTRIBUTORS "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 COPYRIGHT HOLDER OR CONTRIBUTORS 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.
 */

//-----------------------------------------------------------------------------
#define DUMMY __attribute__ ((weak, alias ("irq_handler_dummy")))

//-----------------------------------------------------------------------------
void irq_handler_reset(void);
DUMMY void irq_handler_nmi(void);
DUMMY void irq_handler_hard_fault(void);
DUMMY void irq_handler_sv_call(void);
DUMMY void irq_handler_pend_sv(void);
DUMMY void irq_handler_sys_tick(void);

DUMMY void irq_handler_pm(void);
DUMMY void irq_handler_sysctrl(void);
DUMMY void irq_handler_wdt(void);
DUMMY void irq_handler_rtc(void);
DUMMY void irq_handler_eic(void);
DUMMY void irq_handler_nvmctrl(void);
DUMMY void irq_handler_dmac(void);
DUMMY void irq_handler_usb(void);
DUMMY void irq_handler_evsys(void);
DUMMY void irq_handler_sercom0(void);
DUMMY void irq_handler_sercom1(void);
DUMMY void irq_handler_sercom2(void);
DUMMY void irq_handler_sercom3(void);
DUMMY void irq_handler_sercom4(void);
DUMMY void irq_handler_sercom5(void);
DUMMY void irq_handler_tcc0(void);
DUMMY void irq_handler_tcc1(void);
DUMMY void irq_handler_tcc2(void);
DUMMY void irq_handler_tc3(void);
DUMMY void irq_handler_tc4(void);
DUMMY void irq_handler_tc5(void);
DUMMY void irq_handler_tc6(void);
DUMMY void irq_handler_tc7(void);
DUMMY void irq_handler_adc(void);
DUMMY void irq_handler_ac(void);
DUMMY void irq_handler_dac(void);
DUMMY void irq_handler_ptc(void);
DUMMY void irq_handler_i2s(void);

extern int main(void);

extern void _stack_top(void);
extern unsigned int _etext;
extern unsigned int _data;
extern unsigned int _edata;
extern unsigned int _bss;
extern unsigned int _ebss;

//-----------------------------------------------------------------------------
__attribute__ ((used, section(".vectors")))
void (* const vectors[])(void) =
{
  &_stack_top,                   // 0 - Initial Stack Pointer Value

  // Cortex-M0+ handlers
  irq_handler_reset,             // 1 - Reset
  irq_handler_nmi,               // 2 - NMI
  irq_handler_hard_fault,        // 3 - Hard Fault
  0,                             // 4 - Reserved
  0,                             // 5 - Reserved
  0,                             // 6 - Reserved
  0,                             // 7 - Reserved
  0,                             // 8 - Reserved
  0,                             // 9 - Reserved
  0,                             // 10 - Reserved
  irq_handler_sv_call,           // 11 - SVCall
  0,                             // 12 - Reserved
  0,                             // 13 - Reserved
  irq_handler_pend_sv,           // 14 - PendSV
  irq_handler_sys_tick,          // 15 - SysTick

  // Peripheral handlers
  irq_handler_pm,                // 0 - Power Manager
  irq_handler_sysctrl,           // 1 - System Controller
  irq_handler_wdt,               // 2 - Watchdog Timer
  irq_handler_rtc,               // 3 - Real Time Counter
  irq_handler_eic,               // 4 - External Interrupt Controller
  irq_handler_nvmctrl,           // 5 - Non-Volatile Memory Controller
  irq_handler_dmac,              // 6 - Direct Memory Access Controller
  irq_handler_usb,               // 7 - Universal Serial Bus Controller
  irq_handler_evsys,             // 8 - Event System
  irq_handler_sercom0,           // 9 - Serial Communication Interface 0
  irq_handler_sercom1,           // 10 - Serial Communication Interface 1
  irq_handler_sercom2,           // 11 - Serial Communication Interface 2
  irq_handler_sercom3,           // 12 - Serial Communication Interface 3
  irq_handler_sercom4,           // 13 - Serial Communication Interface 4
  irq_handler_sercom5,           // 14 - Serial Communication Interface 5
  irq_handler_tcc0,              // 15 - Timer/Counter for Control 0
  irq_handler_tcc1,              // 16 - Timer/Counter for Control 1
  irq_handler_tcc2,              // 17 - Timer/Counter for Control 2
  irq_handler_tc3,               // 18 - Timer/Counter 3
  irq_handler_tc4,               // 19 - Timer/Counter 4
  irq_handler_tc5,               // 20 - Timer/Counter 5
  irq_handler_tc6,               // 21 - Timer/Counter 6
  irq_handler_tc7,               // 22 - Timer/Counter 7
  irq_handler_adc,               // 23 - Analog-to-Digital Converter
  irq_handler_ac,                // 24 - Analog Comparator
  irq_handler_dac,               // 25 - Digital-to-Analog Converter
  irq_handler_ptc,               // 26 - Peripheral Touch Controller
  irq_handler_i2s,               // 27 - Inter-IC Sound Interface
};

//-----------------------------------------------------------------------------
void irq_handler_reset(void)
{
  unsigned int *src, *dst;

  src = &_etext;
  dst = &_data;
  while (dst < &_edata)
    *dst++ = *src++;

  dst = &_bss;
  while (dst < &_ebss)
    *dst++ = 0;

  main();
  while (1);
}

//-----------------------------------------------------------------------------
void irq_handler_dummy(void)
{
  while (1);
}

//-----------------------------------------------------------------------------
void _exit(int status)
{
  (void)status;
  while (1);
}
