IAR如何将一组函数或变量放进特定段

Placing a group of functions or variables in a specific section Technical Note 27498 Targets: ARM Component: Linker Updated: 2018/1/16 12:40 Introduction This technical note describes two methods for placing multiple functions or variables in a specified section, without using several #pragma location directives. Discussion One function (or variable) can be placed in a named section using #pragma location, for example: #pragma location=\ void f(void); However, using #pragma location becomes impractical when there are many functions (or variables) to place. These methods will be described:

? Placing several functions/variables using a single pragma directive. ? Placing several functions from an object file using a linker placement directive.

Placing several functions/variables using a single pragma directive

There are two available pragma directives for setting default placement and attributes for declarations and definitions of functions/variables: ? #pragma default_variable_attributes ? #pragma default_function_attributes

These two pragma directives make it possible to use a

single #pragma directive for multiple declarations and definitions, instead of using several #pragma location directives.

An example of how to use these pragma directives

In your source code place some functions in the section MY_FUNC.

#pragma default_function_attributes = @ \

int fun1(int x) {

return x + 1; }

int fun2(int x) {

return x - 1; }

/* Stop placing functions in section MY_FUNC */ #pragma default_function_attributes =

int fun3(int x) {

return x + x; }

/* Place following data in section MY_DATA */

#pragma default_variable_attributes = @ \

int data1; int data2;

/* Stop placing data in section MY_DATA */ #pragma default_variable_attributes =

int data3;

int main() {

data1 = fun1(5); data2 = fun2(5); data3 = fun3(5);

return data1 + data2 + data3; }

Add the following lines to your linker configuration file (.icf) to place all data in the specified memory address range in the section MY_DATA:

define region DATA_region = mem:[from 0x20000000 to 0x20001FFF ]; place in DATA_region { readwrite section MY_DATA }; Add the following lines to your linker configuration file to place all code in the specified memory address range in the section MY_FUNC:

define region FUNC_region = mem:[ from 0x70000 to 0x70FFF ]; place in FUNC_region { readonly section MY_FUNC };