assembler How to access function parameter in assembly?

[jartim 0]

Hi, 

Does anyone have any insight into how to access a function parameter from in-line assembler?

I am doing the following -

void type24Var::add(const unsigned long src)
{
    asm
    {
        movf _src, W
    }
}

But this will not compile and I get the message -

failure
type24Var.cpp(68:2): error: error in built-in assembly
make[2]: [build/default/production/type24Var.o] Error 1 (ignored)

It's driving me crazy, nothing I do seems to clear the error!

 

[Pavel 0]

You access function argument correctly. Must be something else that causes the problem. Have you included system.h? If W is undefined you'll get same error (to check replace W with 0)

[jartim 0]

Thanks Pavel, that was the problem.

Cannot believe I missed it, it was a long day.

Rgds

Tim