Symbols in stack?

Hello Matthew,

Can you provide which compiler/compiler version you are using? Given you posted originally in the TM4C E2E Forum, can we assume it is the TI ARM compiler being used within CCS? Please also include which linker version you are using.

In the mean time, I will move this thread to the compiler forum since they would be better suited to answer with in depth explanations/discussion.

They symbols __stack and __STACK_END differ by 0x1000, which is correct if you specified a stack of that size. I agree with George, I don't know where __STACK_TOP comes from. It is probably defined in the linker command file.

Thanks for the replies.
I'm using TI compiler in CCS.

Another micro I'm working with (using GCC) uses the symbols __StackTop and __StackLimit, hence the confusion.

So in this situation the micro will be using the space between __stack and __STACK_END, which has the correct 0x1000 stack size?

The __STACK_TOP symbol is defined at the bottom of the CMD file.  I haven't altered this but it may have been adjusted before I got this project.  If this symbol isn't used I'll remove it.  In the mean time I've altered the CMD file to put the .stack at the very top of RAM, so its will away from any other symbols anyway.

from the original CMD file:

SECTIONS
{
    .intvecs:   > APP_BASE
    .text   :   > FLASH
    .const  :   > FLASH
    .cinit  :   > FLASH
    .pinit  :   > FLASH

    .vtable :   > RAM_BASE
    .data   :   > SRAM
    .bss    :   > SRAM
    .sysmem :   > SRAM
    .stack  :   > SRAM
}

__STACK_TOP = __stack + 0x1800;

Matthew Gillott said:

So in this situation the micro will be using the space between __stack and __STACK_END, which has the correct 0x1000 stack size?

Probably.  The default stack size is 0x800.  So you must use the build option --stack=0x1000 .

Thanks and regards,

-George