msp430 with minimized low level init code

main.cpp

/*
 * main.cpp
 *
 *  Created on: Mar 15, 2012
 *      Author: kimballr
 */

#include <msp430.h>

#define GREEN_LED_PIN BIT6
#define RED_LED_PIN BIT0
#define OUTPUT_SMCLK_PIN BIT4


static void init() {
	P1OUT = RED_LED_PIN; // start with the red led lit
	P1DIR = GREEN_LED_PIN | RED_LED_PIN | OUTPUT_SMCLK_PIN;
	P1SEL |= OUTPUT_SMCLK_PIN;
}

static void loop() {
	do {
		P1OUT ^= GREEN_LED_PIN | RED_LED_PIN;
		__delay_cycles(128000);
	} while(1);
}

int main(void) {
	init();

	do {
		loop();
	} while(1);

}

#ifdef __cplusplus
extern "C" {
#endif

/**
 * override the lowlevel initialization
 */

__attribute__((naked,section(".init2"))) void __init_stack(void) {
	asm("mov     #__stack, r1\n");
}

/**
 * __low_level_init() - simple replacement routine just do a WDT stop
 *
 */
__attribute__((naked,section(".init3"))) void __low_level_init(void) {
	WDTCTL = WDTHOLD + WDTPW;
}

/**
 * __do_copy_data() - empty replacement when no data
 */
__attribute__((naked,section(".init3"))) void __do_copy_data(void) {
	; // nothing
}

/**
 * __do_copy_bss() - empty replacement when no bss
 */
__attribute__((naked,section(".init3"))) void __do_clear_bss(void) {
	; // nothing
}

#ifdef __cplusplus
}
#endif