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How to propagate a value from C to a SPACE directive with armasm

Marco Accame

Hi all,

I would like to ask help to some expert in armasm.

In my startup.s file I have the following code which reserves 0x400 bytes of RAM to the stack.

; this is the original startup.s file
Stack_Size      EQU     0x00000400

                AREA    STACK, NOINIT, READWRITE, ALIGN=3
Stack_Mem       SPACE   Stack_Size
__initial_sp

Well, I would like to be able to initialise Stack_Size with a value which I have in a cfg.h file or with a const value which I have in a cfg.c file

// this is cfg.h file
#define STACK_SIZE  0x00000400

// this is cfg.c file
#include "cfg.h"
extern const int Stack_Size = STACK_SIZE;

The problem is that I dont know how to export the variable from C and import it into assembly.

I tried to use IMPORT, as in the following, but it does not work.

; this is the modified startup.s

                IMPORT Stack_Size
;Stack_Size      EQU     0x00000400
;               EXPORT  Stack_Size

                AREA    STACK, NOINIT, READWRITE, ALIGN=3
Stack_Mem       SPACE   Stack_Size
__initial_sp

Any suggestion?

Thanks in advance, Marco.

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