Carmine,
When you call a C function, the compiler puts additional code to save registers to the stack for you. The same can be done for C interrupt routines. A description of what the TI C6x C compiler does for interrupt service routine (ISR) and how to set it up is described section 7.6 of the C6000 C Compiler User's Guide SPRU187u at http://www.ti.com/lit/ug/spru187u/spru187u.pdf
As shown in section 7.6.3 skeleton example, writing an interrupt service routine in TI C6x C is simply using the "interrupt" keyword.
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