iar等效符号__bss_end__

Question

我想知道Cortex-M的RAM中静态数据的末端在哪里。 GCC CMSIS Linker脚本提供了__ BSS_END __的符号，我只是采用其地址。有同等的IAR吗？还是我必须用一个变量进行虚拟部分，然后将其放在readwrite之后？

这是我（非常标准的）IAR链接脚本：

/*###ICF### Section handled by ICF editor, don't touch! ****/
/*-Editor annotation file-*/
/* IcfEditorFile="$TOOLKIT_DIR$\config\ide\IcfEditor\cortex_v1_0.xml" */

/*-Specials-*/
define symbol __ICFEDIT_intvec_start__ = 0x00000000;

/*-Memory Regions-*/
define symbol __ICFEDIT_region_ROM_start__   = 0x00000000;
define symbol __ICFEDIT_region_ROM_end__     = (0x00000000+0x00010000-1);
define symbol __ICFEDIT_region_RAM_start__   = 0x20000000;
define symbol __ICFEDIT_region_RAM_end__     = (0x20000000+0x00002000-1);

/*-Sizes-*/
if ( !isdefinedsymbol( __ICFEDIT_size_cstack__ ) )
{ define symbol __ICFEDIT_size_cstack__   = 0x400; }

if ( !isdefinedsymbol( __ICFEDIT_size_heap__ ) )
{ define symbol __ICFEDIT_size_heap__     = 0x800; }

/**** End of ICF editor section. ###ICF###*/

define memory mem with size = 4G;
define region ROM_region   = mem:[from __ICFEDIT_region_ROM_start__   to __ICFEDIT_region_ROM_end__];
define region RAM_region   = mem:[from __ICFEDIT_region_RAM_start__   to __ICFEDIT_region_RAM_end__];

define block CSTACK    with alignment = 8, size = __ICFEDIT_size_cstack__   { };
define block HEAP      with alignment = 8, size = __ICFEDIT_size_heap__     { };

initialize by copy { readwrite };

keep { section .intvec };
place at address mem:__ICFEDIT_intvec_start__ { readonly section .intvec };

place in ROM_region   { readonly };
place in RAM_region   { readwrite,
                        block CSTACK,
                        block HEAP };

Answer 1

如果创建一个块，请将数据放入其中并放置块，您可以使用__ section_begin（）和__ section_end（）将指针纳入此开始和结束堵塞。

示例链接器配置：

/*-Specials-*/
define symbol __ICFEDIT_intvec_start__ = 0x00000000;

/*-Memory Regions-*/
define symbol __ICFEDIT_region_ROM_start__   = 0x00000000;
define symbol __ICFEDIT_region_ROM_end__     = (0x00000000+0x00010000-1);
define symbol __ICFEDIT_region_RAM_start__   = 0x20000000;
define symbol __ICFEDIT_region_RAM_end__     = (0x20000000+0x00002000-1);

/*-Sizes-*/
if ( !isdefinedsymbol( __ICFEDIT_size_cstack__ ) )
{ define symbol __ICFEDIT_size_cstack__   = 0x400; }

if ( !isdefinedsymbol( __ICFEDIT_size_heap__ ) )
{ define symbol __ICFEDIT_size_heap__     = 0x800; }

/**** End of ICF editor section. ###ICF###*/

define memory mem with size = 4G;
define region ROM_region   = mem:[from __ICFEDIT_region_ROM_start__   to __ICFEDIT_region_ROM_end__];
define region RAM_region   = mem:[from __ICFEDIT_region_RAM_start__   to __ICFEDIT_region_RAM_end__];

define block CSTACK    with alignment = 8, size = __ICFEDIT_size_cstack__   { };
define block HEAP      with alignment = 8, size = __ICFEDIT_size_heap__     { };
define block RWDATA    { readwrite }; /* Create block for readwrite to find its boundaries */

initialize by copy { readwrite };

keep { section .intvec };
place at address mem:__ICFEDIT_intvec_start__ { readonly section .intvec };

place in ROM_region   { readonly };
place in RAM_region   { block RWDATA, block CSTACK, block HEAP };

以及访问信息的代码

#include <stdio.h>
#pragma language = extended
#pragma section  = "RWDATA"

int main(void)
{
  char const *rw_start = __section_begin("RWDATA");
  char const *rw_end = __section_end("RWDATA");
  printf("rw_start = %x, rw_end = %x\n", rw_start, rw_end);
}