The MOVE Multiple: MOVEM Instruction

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Presentation transcript:

The MOVE Multiple: MOVEM Instruction This instruction saves or restores multiple registers. Useful in subroutines to save the values of registers not used to pass parameters. MOVEM has two forms: MOVEM register_list,<ea> MOVEM <ea>,register_list No effect on CCR. Example: Saving/restoring registers to from memory SUBR1 MOVEM D0-D7/A0-A6,SAVEBLOCK SAVE D0-D7/A0-A6 . . . MOVEM SAVEBLOCK,D0-D7/A0-A6 Restore D0-D7/A0-A6 RTS Example: Saving/restoring registers using the stack (preferred method). SUBR1 MOVEM D0-D7/A0-A6,-(SP) Push D0-D7/A0-A6 onto the stack MOVEM (SP)+,D0-D7/A0-A6 Restore D0-D7/A0-A6 from the stack