MPC55XX Codewarrior Linker symbols cant be accessed...Stack paint

[mechalec]

Hi all,

This is my first post, so I hope it is clear and concise but also in the correct section.

I am doing some development on a MPC5534, using Freescales Codewarrior compiler.

I am trying to implement a stack paint algorithm, so that I can determine my stack usage at runtime.

My problem lies in the fact that I cannot access the linker generated symbols that are present in the ".lcf".

The compiler/linker error:

C:/Freescale/CW MCU v10.4/MCU/PA_Tools/Command_Line_Tools/mwldeppc|Linker|Error

>Small data relocation (109) in function 'vStackInit'

>in referencing file 'stack_c.obj'

>requires that symbol '_stack_addr'

>in symbol definition file 'linker generated symbol'

The function below is a simplification of my implementation so that you can get the "idea" of what I am doing.

There is no need to correct the algorithm (Yes, I know it is corrupting any existing values on the stack), but any help

as to the  syntax required to access the symbol "_stack_addr" would be greatly appreciated.

#define STACK_VALUE 0x55AA55AAul

void vStackInit( void );

extern uint32_t _stack_addr;

void vStackInit( void )

{

  unsigned int u32IntIndex = 0u;

  unsigned int *pu32Index = (unsigned int *)(_stack_addr);

  for(u32IntIndex = 0ul; u32IntIndex < 0x8000ul; u32IntIndex++ ) {

  pu32Index[u32IntIndex] = STACK_VALUE;

  }

}

Any help would be greatly appreciated.

Thanks

[DavidS]

Hi Scott.

Haven't used the MPC5534 or tool set but the Kinetis device with CW10.x can access the linker script variable with following declaration in a "C" file"

const uchar __FLASHX_START_ADDR[];

Later in "C" file it is used with following way:

(uint_32) __FLASHX_START_ADDR

Hope this helps.

Regards,

David

[mechalec]

Thanks for the feedback, its really helpful. I will try compile and link with that and see if it pulls the correct value.

Regarding your declaration,  are you missing "extern"?

[trytohelp]

Hi,

for my understanding you could use the following.

in main.c file:

extern unsigned long _stack_addr[];

int main(void) {

  volatile int i = 0;

  unsigned long* StackStartAddr;

  StackStartAddr = _stack_addr;

in lcf file:

_stack_addr = ADDR(stack)+SIZEOF(stack);

I can build it without problem on my side.

However I don't have board to test it.

Pascal