http://www.microapl.co.uk/Porting/ColdFire/FAQCF68KLib.html"A lot of code can be run without any changes, since CF68KLib includes handlers to emulate all missing 680x0, CPU32 and CPU32+ instructions. However, there are a few special cases where an instruction behaves slightly differently under ColdFire and which the emulation library cannot automatically correct. The most important of these are:
MULU and MULS instructions executed on ColdFire do not set the overflow flag. Because these are legal ColdFire instructions, with the same opcodes as the 680x0 equivalents, no exception is generated and the CF68KLib handler will therefore not be called. If the original code depends on multiply setting the overflow flag, it will need to be patched or modified to run correctly.
Certain variants of the divide instructions DIVS.L and DIVU.L behave differently under ColdFire.
MOVE.B
,-(A7) and MOVE.B (A7)+, change the stack pointer by one byte on ColdFire instead of 2 bytes as on the 680x0.
An instruction such as MOVE.L (A7)+,(A0,D0.W) is not legal in ColdFire because word-length displacements are not supported. Although the ColdFire processor will take an exception for this instruction, it does so only after incrementing the stack pointer, and so the exception stack frame overwrites the data to be restored. As a result, it is impossible for CF68KLib to reproduce the correct behavior. "
