I have severe reservations on mixing asm and c in the same routine. It is so darn easy to screw it up e.g. who knows if the compiler is saving a value in R0 before and relying on it after the assembly in this 'example'

#pragma asm
mov r0,#7
#pragma endasm

Ok the 'example' may be too obvious, but what about things like CY, OV, acc.

Now that said, I am happily mixing C and asm , I just keep them in separate modules and, if asm call C this comment

 lcall Cfunc; NOTE C may screw up ANY register or flag

is always there.

I have seen this failing because somebody 'tested' which registers the Cfunc affected and relied on that. A later release of the compiler used different registers, it is essential that the caution is applied to ALL registers and flags.

Erik