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Argument passing (convention) to assembly function

SBhushan
Intellectual 360 points

Other Parts Discussed in Thread: TMS320F28234

If an assembly function is called in C, and two 32 bit parameters are passed, the first parameter is placed in 32-bit ACC (AH/AL) and the second is placed on the stack in reverse order (SPRU514D, Page 128, Line 1)

Could anyone please confirm if this calling convention is true when compiled for the TMS320F28234 (no FPU)?

  • 0
    TI__Guru 61235 points

    Yes, what you say is true for all C28x C code.  The compiler section you cite covers both floating point and fixed point devices.  Item #1 on p.127 indicates how floating point parameters are handled in FPU architectures.  For non-FPU (fixed-point) architectures, I believe floating pt. arguments are just treated like any other 32-bit argument.

    Regards,

    David