Compiler/TMS320F28377D: How to prefill the stack segment to perform run-time stack checks

jimj2713

Tool/software: TI C/C++ Compiler

I would like to prefill the stack memory segment with a known pattern, so that my application can check that the stack is within bounds. i have done this on many other processors, but I cannot seem to get the linker-command-file syntax quite right, as there is no effect.

In the cmd file, I have this line:

.stack : > RAMM1 PAGE = 1, fill=0x5555

Yet the stack is still all zeros after boot. The TI documentation seems explicit about referring to the stack as uninitialized memory -- can I initialize this whole segment to a known pattern?

Thanks,

Jim

over 6 years ago

0 Ozino Odharo over 6 years ago

TI__Mastermind 21600 points

JIm,

Without the fill, the .stack section is uninitialized, and no explicit load of this section to system memory is needed. With the fill, the .stack section is initialized, and it must be explicitly loaded to system memory. This load step is probably where things go wrong.

Here is a link to a forum post that works you through the steps to prefill the stack. https://e2e.ti.com/support/microcontrollers/c2000/f/171/t/196862

Regards,

Ozino

0 jimj2713 over 6 years ago in reply to Ozino Odharo

Expert 2395 points

Ozino,

Thanks for the quick reply. Does it matter where in the boot-process this assembly language is placed? Should it occur before or after the SP is initialized (and aligned) in c_int01?

Thanks,

Jim

0 Ozino Odharo over 6 years ago in reply to jimj2713

TI__Mastermind 21600 points

Jim,

There are a few ways to prefill the stack I would recommend using the C code referenced in this post and fill the stack at load time instead of at runtime, where you'd need to write actual assembly instructions that stores the desired value to the stack in a loop.

http://e2e.ti.com/support/microcontrollers/c2000/f/171/t/440218

Regards,

Ozino

C2000™︎ microcontrollers

C2000 microcontrollers forum

Compiler/TMS320F28377D: How to prefill the stack segment to perform run-time stack checks