how to inline a c function called from assembly

andreas von kaenel

Hi all,

I would like to inline a c-function into an assembler file. I did not find any advices in the manuals. My own trials failed cause I don't know how to call the function from the assembly (lcr is not suitable obviously) - I think I should do it similar to a macro call, but how must the c-function be defined then??

Any proposals are very welcome

Best regards,

Andreas

over 14 years ago

0 AartiG over 14 years ago

TI__Guru**** 173310 points

Andreas,

There is a section in the C/C++ Compiler Users Guide that talks about Interfacing C with Assembly Language. Have you taken a look at this section? You didn't mention the device you are using, but if it c28x, please refer to section 7.4 of the C28x Optimizing C/C++ Compiler Users Guide.

This application note might also be helpful: http://focus.ti.com/general/docs/litabsmultiplefilelist.tsp?literatureNumber=spra806

0 andreas von kaenel over 14 years ago in reply to AartiG

Genius 4925 points

Hi Aarti,

Yes I use a C28x device,
and yes I did read the documents you mentioned - but they mainly cover the topic how to access asm functions from c environment. what I'd like to do is the vice versa, accessing a c function from assembly environment and inline this function in the assembly code. So I am still hanging in the nowhere... right now I think what I would like to do is even impossible, though still hoping I am wrong.

Andreas

0 AartiG over 14 years ago in reply to andreas von kaenel

TI__Guru**** 173310 points

Andreas,

I don't know if its possible to inline C function within assembly (I think not), but you can make a call to a C function from assembly, using LCR as you noted before.

   .global _func1
    ....
   LCR #_func1

Maybe someone else will comment on the inlining.

0 George Mock over 14 years ago in reply to andreas von kaenel

TI__Guru**** 244300 points

andreas von kaenel said:
right now I think what I would like to do is even impossible

That's correct. It's impossible.

Thanks and regards,

-George

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how to inline a c function called from assembly