Initializing the Tiva-C stack with a pattern

CodeSkin

Hi, I would like to initialize the stack of my Tiva-C at powerup with a specific pattern (in support of a worst-case stack usage analysis).

I tried to use the "fill" linker directive, but this is not working.

.stack : > SRAM, fill = 0xAAAA5555

I am using the TI ARM compiler (v 5.1.10).

Any tips are much appreciated.

over 10 years ago

0 Giuseppe Iellamo over 10 years ago

Prodigy 220 points

I'm using a GCC toolchain.

I'm filling a guard area before the stack defined ain the linker script file as

.guard : {
__guard_start_ = . ;

. += GUARD_SIZE;

__guard_end_ = . ;
}

Using into the ResetISR this simple code

//
// a 32byte area used to guard the stack
//
for (uint32_t * stackGuard=&__guard_start_; stackGuard<&__guard_end_;)
{
*stackGuard++=0xdeadbeef;
}

0 CodeSkin over 10 years ago in reply to Giuseppe Iellamo

Intellectual 980 points

Hi Guiseppe,

Thank you for your response!

Are you sure that the C environment is ready in ResetISR?

In the TI sample projects ResetISR() actually calls the c_int00 function...

__asm(" .global _c_int00\n"
" b.w _c_int00");

Kind regards,

Beat

0 Giuseppe Iellamo over 10 years ago in reply to CodeSkin

Prodigy 220 points

Yes you can do it.

and if you look at the standard startup_gcc.c in TIVAWARE they're already doin' it in order to copy the data segment initializers from flash to SRAM.

0 CodeSkin over 10 years ago in reply to Giuseppe Iellamo

Intellectual 980 points

Thanks for your help!

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Initializing the Tiva-C stack with a pattern