GNU链接脚本学习-最简链接脚本

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最简连接脚本必备的元素

注： 这里的最简是指能成功生成.bin文件的最简，不代表一定能使MCU跑起来，要跑起来还得指定中断向量表以及堆和栈

1. 指定入口
   ENTRY(ramcode_start)， 其中ramcode_start 可以是汇编程序标号，也可以是c程序函数，但光指定入口连接器并不会把入口链接在最开头，还得在.c或.s中为ramcode_start划分一个段并在链接文件中将该段放在最前面，这样连接成的可执行文件开头的地址就是ramcode_start。

2. 定于存储介质
   /* Specify the memory areas */
   MEMORY
   {
   FLASHCODE(rx) : ORIGIN = 0x8040000, LENGTH = 128K
   FREERAM (xrw) : ORIGIN = 0x20019000, LENGTH = 50K
   }

3. 必要的几个段，
   必须包括.text段、.rodata段、.data段、.bss段

4. 导出end, _end变量
   连接器是根据这两个变量值来结束链接的，内存布局的边界也是通过此变量确定的，如果链接文件中没有用PROVIDE（end = .）导出end变量，那么链接器就不知道可执行文件的结束符在哪里，链接就会报如下错误：
   
   所以，必须在最后一个段中 PROVIDE ( end = . ); PROVIDE ( _end = . );

/*
*****************************************************************************
**
**  File        : pipe485part.ld
**
**  Abstract    : Linker script for STM32F415VG Device with
**                1024KByte FLASH, 128KByte RAM, for run a part of code in SRAM and others in code flash.
**
**                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
**
**  Environment : Atollic TrueSTUDIO(R)
**
**  Distribution: The file is distributed ?as is,? without any warranty
**                of any kind.
**
**  (c)Copyright xxg .
**  You may use this file as-is or modify it according to the needs of your
**  project. This file may only be built (assembled or compiled and linked)
**  using the Atollic TrueSTUDIO(R) product. The use of this file together
**  with other tools than Atollic TrueSTUDIO(R) is not permitted.
**
*****************************************************************************
*//* Entry Point */
ENTRY(ramcode_start)/* Highest address of the user mode stack */
_estack = 0x2001FFFF;    /* end of RAM *//* Generate a link error if heap and stack don't fit into RAM */
_Min_Heap_Size = 0x700;      /* required amount of heap  */
_Min_Stack_Size = 0x80; /* required amount of stack *//* Specify the memory areas */
MEMORY
{FLASHCODE(rx) : ORIGIN = 0x8040000, LENGTH = 128KFREERAM (xrw) : ORIGIN = 0x20019000, LENGTH = 50K
}/* Define output sections */
SECTIONS
{.FLASHCODE :{*(.FLASHCODE)} >FLASHCODE.text :{. = ALIGN(4);*(.text)           /* .text sections (code) */*(.text*)          /* .text* sections (code) */. = ALIGN(4);} >FREERAM.rodata :{. = ALIGN(4);*(.rodata)         /* .rodata sections (constants, strings, etc.) */*(.rodata*)        /* .rodata* sections (constants, strings, etc.) */. = ALIGN(4);} >FREERAM.data :{. = ALIGN(4);_sdata = .;        /* create a global symbol at data start */*(.data)           /* .data sections */*(.data*)          /* .data* sections */. = ALIGN(4);_edata = .;        /* define a global symbol at data end */} >FREERAM. = ALIGN(4);.bss :{/* This is used by the startup in order to initialize the .bss secion */_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;PROVIDE ( end = . );PROVIDE ( _end = . );} >FREERAM/*._user_heap_stack :{. = ALIGN(4);PROVIDE ( end = . );PROVIDE ( _end = . );. = . + _Min_Heap_Size;. = . + _Min_Stack_Size;. = ALIGN(4);} >FREERAM
*/}

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