K60 启动过程分析

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mb5ff982de32716 2015-07-15 15:04:00

文章标签 #endif #if #include #define #ifdef 文章分类 后端开发

很高兴老师借给我一K60的开发板，趁着暑假好好鼓捣鼓捣！

K60 启动过程分析_#endif

有了上图的过程分析我想心里大概有个低了吧！

以下看代码：

/* 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