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Calling conventions for m68k
The Motorola m68k pushes all arguments onto the stack, last to first, so that the lowest
numbered argument not passed in a register is at the lowest address in the stack.
Function return values for integers are stored in
D0 and D1. A7 has a reserved use. Registers A0, A1, D0, D1, F0, and F1 can be used for temporary values.
When a function is compiled with the default options, it must return with
registers
D2 through D7 and registers A2 through A6 unchanged.
If you have floating-point registers, then registers
F2 through F7 must also be unchanged.
Note:
Functions compiled with different calling conventions cannot be run together
without some care.