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#### Motorola 680x0 standard routine prologue / epilogue

Standard entry code for procedures and functions is as follows on the 680x0 architecture:

        move.l  a6,-(sp)
        move.l  sp,a6

The generated exit sequence for procedure and functions looks as follows (in the default processor mode):

        unlk   a6
        rtd    #xx

Where xx is the total size of the pushed parameters.

To have more information on function return values take a look at section 6.1, page 215.

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