firmware/libboard/common/source/board_cstartup_gnu.c

/* ----------------------------------------------------------------------------
 *         ATMEL Microcontroller Software Support
 * ----------------------------------------------------------------------------
 * Copyright (c) 2010, Atmel Corporation
 * Copyright (c) 2017, Harald Welte <laforge@gnumonks.org>
 * Copyright (c) 2018, sysmocom -s.f.m.c. GmbH, Author: Kevin Redon <kredon@sysmocom.de>
 *
 * 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 disclaimer below.
 *
 * Atmel's name may not be used to endorse or promote products derived from
 * this software without specific prior written permission.
 *
 * DISCLAIMER: THIS SOFTWARE IS PROVIDED BY ATMEL "AS IS" AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT ARE
 * DISCLAIMED. IN NO EVENT SHALL ATMEL 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.
 * ----------------------------------------------------------------------------
 */

/*----------------------------------------------------------------------------
 *        Headers
 *----------------------------------------------------------------------------*/

#include "board.h"
#include "board_lowlevel.h"

/*----------------------------------------------------------------------------
 *        Exported variables
 *----------------------------------------------------------------------------*/

/* Stack Configuration */  
#define STACK_SIZE       0x900     /** Stack size (in DWords) */
__attribute__ ((aligned(8),section(".stack")))
uint32_t pdwStack[STACK_SIZE] ;     

/* Initialize segments */
extern uint32_t _sfixed;
extern uint32_t _efixed;
extern uint32_t _etext;
extern uint32_t _srelocate;
extern uint32_t _erelocate;
extern uint32_t _szero;
extern uint32_t _ezero;


/*----------------------------------------------------------------------------
 *        ProtoTypes
 *----------------------------------------------------------------------------*/

/** \cond DOXYGEN_SHOULD_SKIP_THIS */
extern int main( void ) ;
/** \endcond */
void ResetException( void ) ;

/*------------------------------------------------------------------------------
 *         Exception Table
 *------------------------------------------------------------------------------*/

__attribute__((section(".vectors")))
IntFunc exception_table[] = {

	/* Configure Initial Stack Pointer, using linker-generated symbols */
	(IntFunc)(&pdwStack[STACK_SIZE-1]),
	ResetException,

	NMI_Handler,
	HardFault_Handler,
	MemManage_Handler,
	BusFault_Handler,
	UsageFault_Handler,
	0, 0, 0, 0,         /* Reserved */
	SVC_Handler,
	DebugMon_Handler,
	0,                  /* Reserved  */
	PendSV_Handler,
	SysTick_Handler,

	/* Configurable interrupts  */
	SUPC_IrqHandler,    /* 0  Supply Controller */
	RSTC_IrqHandler,    /* 1  Reset Controller */
	RTC_IrqHandler,     /* 2  Real Time Clock */
	RTT_IrqHandler,     /* 3  Real Time Timer */
	WDT_IrqHandler,     /* 4  Watchdog Timer */
	PMC_IrqHandler,     /* 5  PMC */
	EEFC_IrqHandler,    /* 6  EEFC */
	IrqHandlerNotUsed,  /* 7  Reserved */
	UART0_IrqHandler,   /* 8  UART0 */
	UART1_IrqHandler,   /* 9  UART1 */
	SMC_IrqHandler,     /* 10 SMC */
	PIOA_IrqHandler,    /* 11 Parallel IO Controller A */
	PIOB_IrqHandler,    /* 12 Parallel IO Controller B */
	PIOC_IrqHandler,    /* 13 Parallel IO Controller C */
	USART0_IrqHandler,  /* 14 USART 0 */
	USART1_IrqHandler,  /* 15 USART 1 */
	IrqHandlerNotUsed,  /* 16 Reserved */
	IrqHandlerNotUsed,  /* 17 Reserved */
	MCI_IrqHandler,     /* 18 MCI */
	TWI0_IrqHandler,    /* 19 TWI 0 */
	TWI1_IrqHandler,    /* 20 TWI 1 */
	SPI_IrqHandler,     /* 21 SPI */
	SSC_IrqHandler,     /* 22 SSC */
	TC0_IrqHandler,     /* 23 Timer Counter 0 */
	TC1_IrqHandler,     /* 24 Timer Counter 1 */
	TC2_IrqHandler,     /* 25 Timer Counter 2 */
	TC3_IrqHandler,     /* 26 Timer Counter 3 */
	TC4_IrqHandler,     /* 27 Timer Counter 4 */
	TC5_IrqHandler,     /* 28 Timer Counter 5 */
	ADC_IrqHandler,     /* 29 ADC controller */
	DAC_IrqHandler,     /* 30 DAC controller */
	PWM_IrqHandler,     /* 31 PWM */
	CRCCU_IrqHandler,   /* 32 CRC Calculation Unit */
	ACC_IrqHandler,     /* 33 Analog Comparator */
	USBD_IrqHandler,    /* 34 USB Device Port */
	IrqHandlerNotUsed   /* 35 not used */
};

#if defined(BOARD_USB_DFU) && defined(APPLICATION_dfu) && defined(ENVIRONMENT_flash)
#include "usb/device/dfu/dfu.h"
static void BootIntoApp(void)
{
	unsigned int *pSrc;
	void (*appReset)(void);

	pSrc = (unsigned int *) ((unsigned char *)IFLASH_ADDR + BOARD_DFU_BOOT_SIZE);
	/* set vector table to application vector table (store at the beginning of the application) */
	SCB->VTOR = (unsigned int)(pSrc);
	/* set stack pointer to address provided in the beginning of the application (loaded into a register first) */
	__asm__ volatile ("MSR msp,%0" : :"r"(*pSrc));
	/* start application (by jumping to the reset function which address is stored as second entry of the vector table) */
	appReset = (void(*)(void))pSrc[1];

	g_dfu->state = DFU_STATE_appIDLE;

	appReset();
}
#endif

/**
 * \brief This is the code that gets called on processor reset.
 * To initialize the device, and call the main() routine.
 */
void ResetException( void )
{
	uint32_t *pSrc, *pDest ;

	/* Low level Initialize */
	LowLevelInit() ;


#if defined(BOARD_USB_DFU) && defined(APPLICATION_dfu) && defined(ENVIRONMENT_flash)
	// boot application if there is not DFU override
	if (!USBDFU_OverrideEnterDFU() && SCB->VTOR < IFLASH_ADDR + BOARD_DFU_BOOT_SIZE) {
		UART_Exit();
		__disable_irq();
		BootIntoApp();
		/* Infinite loop */
		while ( 1 ) ;
	}
#endif

	/* Initialize the relocate segment */
	pSrc = &_etext ;
	pDest = &_srelocate ;

	if ( pSrc != pDest )
	{
		for ( ; pDest < &_erelocate ; )
		{
		    *pDest++ = *pSrc++ ;
		}
	}

	/* Clear the zero segment */
	for ( pDest = &_szero ; pDest < &_ezero ; )
	{
		*pDest++ = 0;
	}

	/* Set the vector table base address */
	pSrc = (uint32_t *)&_sfixed;
	SCB->VTOR = ( (uint32_t)pSrc & SCB_VTOR_TBLOFF_Msk ) ;
	
	if ( ((uint32_t)pSrc >= IRAM_ADDR) && ((uint32_t)pSrc < IRAM_ADDR+IRAM_SIZE) )
	{
	    SCB->VTOR |= 1 << SCB_VTOR_TBLBASE_Pos ;
	}

	/* App should have disabled interrupts during the transition */
	__enable_irq();

	/* Branch to main function */
	main() ;

	/* Infinite loop */
	while ( 1 ) ;
}