K60 启动过程分析

标签：k60 启动分析

挺高兴的老师借了我一块K60的开发板，趁着暑假好好鼓捣鼓捣！

有了上图的过程分析我想心里大概有个低了吧！

下面看代码：

/* CodeWarrior ARM Runtime Support Library

 * Copyright ?2012 Freescale Semiconductors. All rights reserved.

 *

 * $Date: 2013/02/08 07:14:44 $

 * $Revision: 1.6 $

 */


/*

 *	__arm_start.c	-	entry-point for ARM programs

 *

 */

#include <string.h>

#include <stdlib.h>

#include <runtime_configuration.h>



_EWL_BEGIN_EXTERN_C



#if SUPPORT_SEMIHOST_ARGC_ARGV

#define __MAX_CMDLINE_ARGS 10

static char *argv[__MAX_CMDLINE_ARGS] = { 0 };

#else

static char *argv[] = { 0 };

#endif



#if __GNUC__

#define __call_static_initializers __init_cpp

#endif

#if SUPPORT_SEMIHOST_ARGC_ARGV

extern int __argc_argv(int, char **);

#endif /* SUPPORT_SEMIHOST_ARGC_ARGV */



extern void __call_static_initializers(void);

extern int main(int, char **);



#ifdef __VFPV4__

extern void __fp_init(void);

#endif /* __VFPV4__ */



extern void __init_registers();

extern void __init_hardware();

extern void __init_user();



#if defined(__APCS_ROPI)

extern void __init_pic();

#endif



#if defined(__APCS_RWPI)

extern void __init_pid();

#endif



#if defined(__APCS_ROPI) || defined(__APCS_RWPI)

extern void __load_static_base();

#endif



#if defined(__SEMIHOSTING)

extern void __init_semihost(void) _EWL_WEAK;

#endif



#if SUPPORT_ROM_TO_RAM

extern void __copy_rom_sections_to_ram(void);

extern char __S_romp[];

#endif



static void zero_fill_bss(void)

{

	extern char __START_BSS[];

	extern char __END_BSS[];



	memset(__START_BSS, 0, (__END_BSS - __START_BSS));

}



#ifndef __thumb // Thumb version

#error Thumb startup

#endif



// To keep iar debugger happy

void __iar_program_start(void) _EWL_NAKED;

void __thumb_startup(void);

void __iar_program_start()

{

	__thumb_startup();

}





void __thumb_startup(void) _EWL_NAKED;

void __thumb_startup(void)

{

		// Setup registers

		__init_registers();



		// setup hardware

		__init_hardware();





#if defined(__APCS_ROPI) || defined(__APCS_RWPI)

		//	static base register initialization

		__load_static_base();

#endif

#if defined(__APCS_RWPI)

		//	-pid

		//	setup static base for SB relative position independent data

		//	perform runtime relocation

		__init_pid();

#endif

#if defined(__APCS_ROPI)

		//	-pic

		//	perform runtime relocation for position independent code

		__init_pic();

#endif

		//	zero-fill the .bss section

		zero_fill_bss();



#if SUPPORT_ROM_TO_RAM

		if (__S_romp != 0L)

			__copy_rom_sections_to_ram();

#endif





		//      initialize the floating-point library

#ifdef __VFPV4__

		__fp_init();

#endif



		//	call C++ static initializers

		__call_static_initializers();



		// initializations before main, user specific

		__init_user();



#if defined(__SEMIHOSTING)

		// semihost initializations

		__init_semihost();

#endif



		//	call main(argc, &argv)

#if SUPPORT_SEMIHOST_ARGC_ARGV

		exit(main(__argc_argv(__MAX_CMDLINE_ARGS, argv), argv));

#else

		exit(main(0, argv));

#endif



		//	should never get here

		while (1);



}



_EWL_END_EXTERN_C

K60 启动过程分析,布布扣,bubuko.com

K60 启动过程分析

标签：k60 启动分析

原文地址：http://blog.csdn.net/qqzwp/article/details/37900865