Calling an Assembly Functon From C (RVMDK)

Hello,

I am struggling to do something that should be very simple: call an assembly function from a C function. Can anyone give me some pointers or an example of how to do this?

I am using uVision 3 with Realview MDK C compiler.

All of the documentation that I am finding points me to use inline assembly commands. However, this won't work, as I need the assembly code to modify the stack pointer.

Here is what I would like the code to:

void ChangeRegion (void)
{
     asm_adjust_sp(0x78000);  //call assembly to change the stack pointer
}

//asm_adjust_spi(Ulong ulAddress)
//1. change stack pointer to 0x4000F000
//2. branch to a the address contained by ulAddress

Any help that you can provide would be greatly appreciated.

Thanks!