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A.1.2.3 Change the allocated area using the -Xpreinclude option

You can use the -Xpreinclude option to allocate all variables declared or defined in a file into an arbitrary section, without changing the C source file. You can reduce the code size by allocating them in a section with efficient access.

(1)

Prepare a header file (.h) containing a #pragma section directive.

Example

Allocating in .sdata/.sbss section [section.h]

#pragma section gp_disp16

(2)

Use the -Xpreinclude option to include the header you created in (1) at the beginning of the compilation unit.

Example

If the header file with the specified section is section.h

>ccrh main.c -Xpreinclude=section.h

 

Compiled as if main.c starts with an include of "section.h".

 

However, a link-time error will be output if the variables do not fit in the section specified in (1). In this case, change the section of the variables in the C source file.

E0562330 : Relocation size overflow : "file"-"section"-"offset"

Example

Changing variables to .sdata23/.sbss23 section

int a = 1;              /*Allocated in section specified in (1)*/
int b;                  /*Allocated in section specified in (1)*/
#pragma section gp_disp23
int c = 1;              /*Allocated in .sdata23 section*/
int d;                  /*Allocated in .sbss23 section*/
#pragma section default
int e = 1;              /*Allocated in default .data section*/
int f;                  /*Allocated in default .bss section*/