MCU-PLUS-SDK-AM243X: the code is running in the R5 core, how to obtain the value of PSP?

guxl24

Now that the code is running in the R5 core, how can I obtain the value of PSP? I used the code shown in the figure below, but compilation cannot pass. It seems that the compiler doesn't recognize PSP. How can I obtain the value of PSP pointer?

over 1 year ago

0 Ralph Jacobi over 1 year ago

TI__Guru*** 135355 points

Hello guxl24,

Our usual expert for this query is out of office, so I'm seeking who else on the team can help address this.

Best Regards,

Ralph Jacobi

0 Aakash Kedia over 1 year ago in reply to Ralph Jacobi

TI__Mastermind 26145 points

Hi guxl24,

I assume you intend to read the SP which is at R13.

You can simply use "str" to store the same to a variable with intrinsics.

I hope this solves your problem.

Best Regards,
Aakash

0 guxl24 over 1 year ago in reply to Aakash Kedia

Prodigy 150 points

how to use "str" to store the same to a variable with intrinsics？

0 Piyush Sharma over 1 year ago in reply to guxl24

TI__Prodigy 30 points

Try using ,

uint32_t result;

__asm volatile ("mov %0, sp" : "=r" (result) );

In R core you have to use sp , The instruction that you were using is valid for M core.

Cortex-R series processors typically only use one stack pointer 'sp' .

0 guxl24 over 1 year ago in reply to Piyush Sharma

Prodigy 150 points

But I want to get sp_user in the exception_handler, for example in the Abort mode or undefined mode. How to obtain sp_user?

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MCU-PLUS-SDK-AM243X: the code is running in the R5 core, how to obtain the value of PSP?