RA_startup.c

#include <stddef.h>

extern int _estack;
void __libc_init_array(void);
extern int _sdata, _edata, _sidata;
extern int _sbss, _ebss;
int main(void);

void Reset_Handler(void) {
	// Clear .bss section
	int *p = &_sbss;
	while( p != &_ebss ) {
		*p = 0;
		p++;
	}

	// Copy .data section
	const int *src = &_sidata;
	int *dest = &_sdata;
	while( dest != &_edata ) {
		*dest = *src;
		src++;
		dest++;
	}

	__libc_init_array();
	main();
	while(1);
}

__attribute__((weak))
void NMI_Handler(void) {
	while(1) {
	}
}
__attribute__((weak))
void HardFault_Handler(void) {
	while(1){}
}
__attribute__((weak))
void SVC_Handler(void) {}
__attribute__((weak))
void PendSV_Handler(void) {}
__attribute__((weak))
void SysTick_Handler(void) {}

__attribute__((weak))
void Handler0(void) {}
__attribute__((weak))
void Handler1(void) {}
__attribute__((weak))
void Handler2(void) {}
__attribute__((weak))
void Handler3(void) {}
__attribute__((weak))
void Handler4(void) {}
__attribute__((weak))
void Handler5(void) {}
__attribute__((weak))
void Handler6(void) {}
__attribute__((weak))
void Handler7(void) {}
__attribute__((weak))
void Handler8(void) {}
__attribute__((weak))
void Handler9(void) {}
__attribute__((weak))
void Handler10(void) {}
__attribute__((weak))
void Handler11(void) {}
__attribute__((weak))
void Handler12(void) {}
__attribute__((weak))
void Handler13(void) {}
__attribute__((weak))
void Handler14(void) {}
__attribute__((weak))
void Handler15(void) {}
__attribute__((weak))
void Handler16(void) {}
__attribute__((weak))
void Handler17(void) {}
__attribute__((weak))
void Handler18(void) {}
__attribute__((weak))
void Handler19(void) {}
__attribute__((weak))
void Handler20(void) {}
__attribute__((weak))
void Handler21(void) {}
__attribute__((weak))
void Handler22(void) {}
__attribute__((weak))
void Handler23(void) {}
__attribute__((weak))
void Handler24(void) {}
__attribute__((weak))
void Handler25(void) {}
__attribute__((weak))
void Handler26(void) {}
__attribute__((weak))
void Handler27(void) {}
__attribute__((weak))
void Handler28(void) {}
__attribute__((weak))
void Handler29(void) {}
__attribute__((weak))
void Handler30(void) {}
__attribute__((weak))
void Handler31(void) {}

__attribute__((section(".isr_vector")))
void (*isr_vector[])(void) = {
	(void *)&_estack,
	Reset_Handler,
	NMI_Handler,
	HardFault_Handler,
	NULL,
	NULL,
	NULL,
	NULL,
	NULL,
	NULL,
	NULL,
	SVC_Handler,
	NULL,
	NULL,
	PendSV_Handler,
	SysTick_Handler,
	Handler0,
	Handler1,
	Handler2,
	Handler3,
	Handler4,
	Handler5,
	Handler6,
	Handler7,
	Handler8,
	Handler9,
	Handler10,
	Handler11,
	Handler12,
	Handler13,
	Handler14,
	Handler15,
	Handler16,
	Handler17,
	Handler18,
	Handler19,
	Handler20,
	Handler21,
	Handler22,
	Handler23,
	Handler24,
	Handler25,
	Handler26,
	Handler27,
	Handler28,
	Handler29,
	Handler30,
	Handler31,
};