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https://github.com/RIOT-OS/RIOT.git
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73 lines
1.9 KiB
C
73 lines
1.9 KiB
C
/*
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* Copyright (C) 2014 Freie Universität Berlin, Hinnerk van Bruinehsen
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*
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* This file is subject to the terms and conditions of the GNU Lesser
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* General Public License v2.1. See the file LICENSE in the top level
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* directory for more details.
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*/
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/**
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* @ingroup cpu_atmega1281
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* @{
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*
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* @file
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* @brief Startup code and interrupt vector definition
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*
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* @author Hinnerk van Bruinehsen <h.v.bruinehsen@fu-berlin.de>
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*
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* @}
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*/
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#include <stdint.h>
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#include <avr/interrupt.h>
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#include <avr/io.h>
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/* For Catchall-Loop */
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#include "board.h"
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/**
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* @brief functions for initializing the board, std-lib and kernel
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*/
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extern void board_init(void);
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extern void kernel_init(void);
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extern void __libc_init_array(void);
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/**
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* @brief This pair of functions hook circumvent the call to main
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*
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* avr-libc normally uses the .init9 section for a call to main. This call
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* seems to be not replaceable without hacking inside the library. We
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* circumvent the call to main by using section .init7 to call the function
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* reset_handler which therefore is the real entry point and section .init8
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* which should never be reached but just in case jumps to exit.
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* This way there should be no way to call main directly.
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*/
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void init7_ovr(void) __attribute__((naked)) __attribute__((section(".init7")));
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void init8_ovr(void) __attribute__((naked)) __attribute__((section(".init8")));
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void init7_ovr(void)
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{
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asm("call reset_handler");
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}
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void init8_ovr(void)
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{
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asm("jmp exit");
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}
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/**
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* @brief This function is the entry point after a system reset
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*
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* After a system reset, the following steps are necessary and carried out:
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* 1. initialize the board (sync clock, setup std-IO)
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* 2. initialize and start RIOTs kernel
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*/
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void reset_handler(void)
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{
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/* initialize the board and startup the kernel */
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board_init();
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/* startup the kernel */
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kernel_init();
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}
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