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Import a C variable in ASM with GNU compiler???

Hello all!
I'm writting a little OS for LCP2129.
For the moment their are only two task and one sheduler.
But i have a problem:

I would like to Import a C variable in ASM.
My compiler is GCC GNU compiler.

Do someone know how to do this?

The finalitty is to write the content of a variable in the R15(PC) register
Here is my code but it doesn't work:

typedef struct {
        unsigned long PC;
}contexte_tache;


contexte_tache tache1_contexte;


PC_TEMPORAIRE=tache1_contexte.PC;
asm("IMPORT PC_TEMPORAIRE");
asm("STR PC_TEMPORAIRE PC");

Does someone can help me?????????????
If it works i will post my code furthermore...