topic running code out of the stack in S32 Design Studio

running code out of the stack

hajianik — Fri, 09 Apr 2021 19:51:38 GMT

Hi,

I was wondering if any one of the brilliant mind would show me how to load the stack and run the code from there.

I know how to use linker script file to run code out of RAM.

I'm exclusively talking about the stack. I have seen other people do it long time ago, and I know it could be done.

Please don't give me "Stack is used to save machine state" and things of that nature.

Thanks,

Koorosh Hajiani

Re: running code out of the stack

stanish — Thu, 15 Apr 2021 08:05:30 GMT

Hi,

could you describe more in the detail what are you trying to achieve by that construction?

Thanks,

Stan

Re: running code out of the stack

hajianik — Thu, 15 Apr 2021 16:50:22 GMT

Hi Stan,

I just need to run a function from RAM. This is concerning the the launching command to read/write to Program Once in program flash IFR.

I've done this using a linker script file.I've seen other people use stack to run from RAM however it was a long time ago.

was wondering if any of the brilliant mind out there has an idea!!!!

Thanks,

Koorosh

Re: running code out of the stack

jiri_kral — Fri, 16 Apr 2021 11:32:44 GMT

Hi,

well, running some function directly from stack is quite unusual way and not much effective - in my opinion. First of all you need to allocate local memory, then memcopy your "function implementation" into allocated memory from flash and after that you can call function pointer.

Easiest way is just call function from RAM (as you already did). There is a macro in S32K1xx SDK for running functions from RAM - here is simple example:

START_FUNCTION_DECLARATION_RAMSECTION
void CCIF_Callback(void)
END_FUNCTION_DECLARATION_RAMSECTION

Hope it helps.

Jiri

Re: running code out of the stack

hajianik — Fri, 16 Apr 2021 21:37:55 GMT

I know all that.

My question was/is specifically on running function out of stack.

Thanks,