IAR map文件说明

map文件是一个底层变成文件必须掌握的

IAR的map文件分为以下几个部分（以下的所引用的map内容）

一、RUNTIME MODEL ATTRIBUTES

CppFlavor                     = *
__Heap_Handler                = Basic
__SystemLibrary               = DLib
__dlib_dynamic_initialization = normal

二、PLACEMENT SUMMARY

各section在存储器中的分配

"A1":  place at 0x08000000 { ro section .intvec };
"P1":  place in [from 0x08000000 to 0x080fffff] { ro };
"P2":  place in [from 0x20000000 to 0x2001ffff] { rw, block CSTACK, block HEAP };

• A1, FLASH空间，存放ro section和 .intvec
• P1, FLASH空间，存放ro data
• P2, sram空间，存放rw data, CSTACK, HEAP

如上图：
- A1里放的是.intvec，也就是复位向量表
- P1里放的是可执行代码和一些只读的数据
- P2第一部分存放.data，已经初始化的静态和全局变量
- P2第二部分存放.bss，未初始化的静态和全局变量
- P3第三部分存放CSTACK=0x4000和HEAP=0x1000.

系统SP的起始地址为CSTACK的结束地址， cortex的堆栈向下生长，每次入栈都会消耗8个word（32字节）的SRAM空间

堆栈大小设置如下图所示

三、INIT TABLE

显示与初始化有关的section tables

四、MODULE SUMMARY

显示所有被连接的文件信息，包括目标文件和库文件等

五、ENTRY LIST

给出了所有函数的入口地址，大小，类型

六、目标代码占用ROM和RAM

map文件的最后会给出目标代码占用的ROM和RAM空间大小

48 598 bytes of readonly  code memory
80 703 bytes of readonly  data memory
62 395 bytes of readwrite data memory

readonly code和readonly data使用的是ROM空间
readwrite data使用的是SRAM空间

附录：IAR Section 说明

Section	Description
.bss	Holds zero-initialized static and global variables.
CSTACK	Holds the stack used by programs.
.data	Holds static and global initialized variables.
.data_init	Holds initial values for .data sections when the linker directive initialize by copy is used.
DLIB_PERTHREAD	Holds variables that contain static states for DLIB modules.
.exc.text	Holds exception-related code.
HEAP	Holds the heap used for dynamically allocated data.
.iar.dynexit	Holds the atexit table.
.init_array	Holds a table of dynamic initialization functions.
.intvec	Holds the reset vector table
IRQ_STACK	Holds the stack for interrupt requests, IRQ, and exceptions.
.noinit	Holds _ _no_init static and global variables.
.preinit_array	Holds a table of dynamic initialization functions.
.prepreinit_array	Holds a table of dynamic initialization functions.
.rodata	Holds constant data.
.text	Holds the program code.
.textrw	Holds _ _ramfunc declared program code.
.textrw_init	Holds initializers for the .textrw declared section.