STM32CubeIDE链接脚本讲解

        下面就让我们针对具体的链接脚本进行讲解。

/*

******************************************************************************

**

**  File        : LinkerScript.ld

**

**  Author      : STM32CubeIDE

**

**  Abstract    : Linker script for STM32H7 series

**                128Kbytes FLASH and 1056Kbytes RAM

**

**                Set heap size, stack size and stack location according

**                to application requirements.

**

**                Set memory bank area and size if external memory is used.

**

**  Target      : STMicroelectronics STM32

**

**  Distribution: The file is distributed as is, without any warranty

**                of any kind.

**

*****************************************************************************

** @attention

**

** Copyright (c) 2022 STMicroelectronics.

** All rights reserved.

**

** This software is licensed under terms that can be found in the LICENSE file

** in the root directory of this software component.

** If no LICENSE file comes with this software, it is provided AS-IS.

**

****************************************************************************

*/

/* Entry Point */

ENTRY(Reset_Handler)

/* Highest address of the user mode stack */

_estack = ORIGIN(RAM_D1) + LENGTH(RAM_D1);    /* end of RAM */

/* Generate a link error if heap and stack don't fit into RAM */

_Min_Heap_Size = 0x200 ;      /* required amount of heap  */

_Min_Stack_Size = 0x400 ; /* required amount of stack */

/* Specify the memory areas */

MEMORY

{

  FLASH (rx)     : ORIGIN = 0x08000000, LENGTH = 128K

  DTCMRAM (xrw)  : ORIGIN = 0x20000000, LENGTH = 128K

  RAM_D1 (xrw)   : ORIGIN = 0x24000000, LENGTH = 512K

  RAM_D2 (xrw)   : ORIGIN = 0x30000000, LENGTH = 288K

  RAM_D3 (xrw)   : ORIGIN = 0x38000000, LENGTH = 64K

  ITCMRAM (xrw)  : ORIGIN = 0x00000000, LENGTH = 64K

}

/* Define output sections */

SECTIONS

{

  /* The startup code goes first into FLASH */

  .isr_vector :

  {

    . = ALIGN(4);

    KEEP(*(.isr_vector)) /* Startup code */

    . = ALIGN(4);

  } >FLASH

  /* The program code and other data goes into FLASH */

  .text :

  {

    . = ALIGN(4);

    *(.text)           /* .text sections (code) */

    *(.text*)          /* .text* sections (code) */

    *(.glue_7)         /* glue arm to thumb code */

    *(.glue_7t)        /* glue thumb to arm code */

    *(.eh_frame)

    KEEP (*(.init))

    KEEP (*(.fini))

    . = ALIGN(4);

    _etext = .;        /* define a global symbols at end of code */

  } >FLASH

  /* Constant data goes into FLASH */

  .rodata :

  {

    . = ALIGN(4);

    *(.rodata)         /* .rodata sections (constants, strings, etc.) */

    *(.rodata*)        /* .rodata* sections (constants, strings, etc.) */

    . = ALIGN(4);

  } >FLASH

  .ARM.extab   : { *(.ARM.extab* .gnu.linkonce.armextab.*) } >FLASH

  .ARM : {

    __exidx_start = .;

    *(.ARM.exidx*)

    __exidx_end = .;

  } >FLASH

  .preinit_array     :

  {

    PROVIDE_HIDDEN (__preinit_array_start = .);

    KEEP (*(.preinit_array*))

    PROVIDE_HIDDEN (__preinit_array_end = .);

  } >FLASH

  .init_array :

  {

    PROVIDE_HIDDEN (__init_array_start = .);

    KEEP (*(SORT(.init_array.*)))

    KEEP (*(.init_array*))

    PROVIDE_HIDDEN (__init_array_end = .);

  } >FLASH

  .fini_array :

  {

    PROVIDE_HIDDEN (__fini_array_start = .);

    KEEP (*(SORT(.fini_array.*)))

    KEEP (*(.fini_array*))

    PROVIDE_HIDDEN (__fini_array_end = .);

  } >FLASH

  /* used by the startup to initialize data */

  _sidata = LOADADDR(.data);

  /* Initialized data sections goes into RAM, load LMA copy after code */

  .data :

  {

    . = ALIGN(4);

    _sdata = .;        /* create a global symbol at data start */

    *(.data)           /* .data sections */

    *(.data*)          /* .data* sections */

    *(.RamFunc)        /* .RamFunc sections */

    *(.RamFunc*)       /* .RamFunc* sections */

    . = ALIGN(4);

    _edata = .;        /* define a global symbol at data end */

  } >RAM_D1 AT> FLASH

  /* Uninitialized data section */

  . = ALIGN(4);

  .bss :

  {

    /* This is used by the startup in order to initialize the .bss section */

    _sbss = .;         /* define a global symbol at bss start */

    __bss_start__ = _sbss;

    *(.bss)

    *(.bss*)

    *(COMMON)

    . = ALIGN(4);

    _ebss = .;         /* define a global symbol at bss end */

    __bss_end__ = _ebss;

  } >RAM_D1

  /* User_heap_stack section, used to check that there is enough RAM left */

  ._user_heap_stack :

  {

    . = ALIGN(8);

    PROVIDE ( end = . );

    PROVIDE ( _end = . );

    . = . + _Min_Heap_Size;

    . = . + _Min_Stack_Size;

    . = ALIGN(8);

  } >RAM_D1

  /* Remove information from the standard libraries */

  /DISCARD/ :

  {

    libc.a ( * )

    libm.a ( * )

    libgcc.a ( * )

  }

  .ARM.attributes 0 : { *(.ARM.attributes) }

}

   ENTRY(RESET_Handler)定义了程序执行的第一条指令的地址，即复位中断处理函数。

        _estack = ORIGIN(RAM_D1) + LENGTH(RAM_D1); 定义了一个名为_estack的符号，其值为RAM_D1区的最后地址。ORIGIN函数用来REGION的首地址，LENGTH用来获取REGION的长度。

        _Min_Heap_Size = 0x200 ;定义了最小堆大小

        _Min_Stack_Size = 0x400;定义了最小栈大小

        MEMORY定义了各个Region的首地址和大小，从脚本上STM32H750有如下地址空间

  FLASH (rx)     : ORIGIN = 0x08000000, LENGTH = 128K

  DTCMRAM (xrw)  : ORIGIN = 0x20000000, LENGTH = 128K

  RAM_D1 (xrw)   : ORIGIN = 0x24000000, LENGTH = 512K

  RAM_D2 (xrw)   : ORIGIN = 0x30000000, LENGTH = 288K

  RAM_D3 (xrw)   : ORIGIN = 0x38000000, LENGTH = 64K

  ITCMRAM (xrw)  : ORIGIN = 0x00000000, LENGTH = 64K