以下是TI给我的回复： Regarding your inquiry, To call a C subroutine from assembly you have to follow below mentioned steps:
1) Declare and define the C subroutine in a .c file
2) To access a C function or object from assembly language, declare the C object with .global or .ref. This creates an undeclared external reference that the linker resolves.
3)When you call a C function from assembly language, push any arguments onto the stack in reverse order. Pop them off after calling the function.
4) The compiler adds an underscore ( _ ) to the beginning of all identifiers(that is, labels). In assembly language modules, you must use an underscore prefix for all objects that are to be accessible from C. For example, a C object named x is called _x in assembly language. So if you have to call the C subroutine "func_c" in assembly then declare the subroutine as .global _func_c and then call the subroutine.
5)Functions must return values in the accumulator. 16-bit integer values and pointers must be loaded in the accumulator with proper sign extension.
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