CCS/AM3354: ERROR MESSAGE, Address must be defined in the current section

Sorry George

I still can not understand how to get the address of control block uipNextRunningTaskTCBPtr.

Best Regards

Jack

can i  write like this?

.global    uipNextRunningTaskTCBPtr
uipNextRunningTaskTCBPtrAddr    .field    uipNextRunningTaskTCBPtr,32

LDR      R1, uipNextRunningTaskTCBPtrAddr

best regards

Jack

Similar to the method used in the forum thread I referenced, write small piece of C code which does the same thing, then see how the code generated by the compiler does it.  

Consider this simple source file ...

/* const_table_example.c */

/* This structure is a stand-in for the real uipTask, which I do not have */
typedef struct
{
   int a, b, c;
} uipTask;

extern  uipTask  *uipCurrentTaskTCBPtr;

/* A simple function which uses the global pointer variable */
int test_function()
{
   return uipCurrentTaskTCBPtr->b;
}

Build it with a command similar too ...

% armcl -mv7a8 --src_interlist const_table_example.c

Because of --src_interlist, the compiler generated assembly code is a file named const_table_example.asm.  Inspect it.  The key lines are ...

test_function:
;* --------------------------------------------------------------------------*
;** 14  -----------------------    return (*uipCurrentTaskTCBPtr).b;
        LDR       V9, $C$CON1           ; [DPU_V7A8_PIPE0] |14|
...

;******************************************************************************
;* CONSTANT TABLE                                                             *
;******************************************************************************
        .sect   ".text"
        .align  4
||$C$CON1||:    .bits   uipCurrentTaskTCBPtr,32

Line 4 loads the address of uipCurrentTaskTCBPtr into the register V9.  This is a reference to a constant table entry.  This constant table, which is in the same section, is written right after the function.  

You need to do something similar.

Thanks and regards,

-George

Hi George

where should I insert the the command line "% armcl -mv7a8 --src_interlist const_table_example.c"? 

Put the command line in .c file or .s file? Or the command line is just used  for insert the assembler function 

test_function into const_table_example.c?

In addition, does "||........||" means the address? If I quote "||$C$CON1||", it means get the address of variable

 $C$CON1?

So , now I am porting an real time operating system to AM3354, I defined uipCurrentTaskTCBPtr in task.c,

typedef struct uip_TSK_STRUCT 
{     
    int a,b,c;
 
} uipTask;   

typedef uipTask *  uipTaskPtr;

And I write in .s file like this:

.sect   ".text"
        .align  4
||$C$CON1||:    .bits   uipCurrentTaskTCBPtr,32

uipScheduler

   LDR R1, $C$CON1 

Does this ok?

zemin shan said:

where should I insert the the command line "% armcl -mv7a8 --src_interlist const_table_example.c"? 

Put the command line in .c file or .s file? Or the command line is just used  for insert the assembler function 

test_function into const_table_example.c?

The file const_table_example.c, and the command that builds it, form an example.  It demonstrates a method for you to learn.  Do not use any of it in your system.

zemin shan said:

In addition, does "||........||" means the address? If I quote "||$C$CON1||", it means get the address of variable

 $C$CON1?

The compiler uses the syntax ||label name here||.  But it is best to just ignore the ||.  If you are curious, this forum post has the details.  In this specific case, read this to mean the symbol $C$CON1 corresponds to the address of the constant table entry.  

This assembly code ...

zemin shan said:

        .sect   ".text"

        .align  4

||$C$CON1||:    .bits   uipCurrentTaskTCBPtr,32

uipScheduler

   LDR R1, $C$CON1

... appears to be correct.  Though, as I explain above, the || around the label name is not needed.

Thanks and regards,

-George

Since I rewrite my code, download and debug on chip AM3354, I still got the error message :

why this happen?

Best Regards

Jack

Hello George

What I mean is that the command line

 " ||$C$CON1||:   .bits   uipCurrentTaskTCBPtr,32 "  or

 " $C$CON1:  .bits   uipCurrentTaskTCBPtr,32 "

can not put the value in address uipCurrentTaskTCBPtr into

varaable $C$CON1.

And put the value in address in uipCurrentTaskPtr into $C$CON1

is exact what I need. 

Best Regards

Jack

I recommend you ignore the CCS display problem, just for now.  I'm not sure, but I think that is typical for hand-coded assembly.

When you run the code, does it work as expected?  

Thanks and regards,

-George

No, it is not work as I expected.  I want the type of pointer $C$CON1 is uipTask, and the value of $C$CON is the address of struct uipCurrentTaskTCBPtr. 

But the type of pointer $S$CON1 is void, and the value of $C$CON is not the address of struct uipCurrentTaskTCBPtr, it is another value.

Best Regards 

Jack

Hello George

I think, I find the problem, since I use the code:

     .global  uipNextRunningTaskTCBPtr
uipNextRunningTaskTCBPtrAddr:     .bits uipNextRunningTaskTCBPtr,32

uipScheduler
     LDR       R1 ,uipNextRunningTaskTCBPtr

The value in register R1 is the Address of uipNextRunningTaskTCBPtr, it is not the value of uipNextRunningTaskTCBPtr.

But what I need is that the value in uipNextRunningTaskTCBPtr shift into R1.

what should I modify?

Best Regards

Jack

Thanks George

It is works, but I want to inquire you another question.

How can I replace the following code with TI Assembler?

IF :DEF:MixPreemption

    .................

ELSE

    .................

ENDIF

MixPreemption is a micro

Best Regards

Jack

Replace the IF, ELSE, and ENDIF with .if, .else, and .endif.  To learn about those directives, please search the TI ARM assembly tools manual for the sub-chapter titled Assembler Directives.  

For IF :DEF:MixPreemption, please search the same manual for the sub-chapter titled Defining Symbolic Constants.  Note how the operator $$isdefed is used.

Thanks and regards,

-George