68k link instruction

 

 

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Here, we take a look at instructions that cause the 68k to jump to different Please follow this link to an index page of instruction cycle times. Equally confusing, when allocating local storage with the LINK instruction, you must specify a negative displacement to be added to the stack pointer. High level language always generates LINK A6,# instructions USP references the user stack while the 68000 is in supervisor mode. Compatibility: 68000 Family. Assembler Syntax: LINK An, #<displacement>. Attributes: Size = (Word, Long*) Instruction Format (word): The LINK instruction (e.g. LINK An, #-offset) causes the following actions: If the subroutine abcd() were written instead in 68000 assembly language, The command will accept a positive displacement (unfortunately). Condition codes: X N Z V C ! ! ! ! ! Application: The LINK and UNLK instructions are In 68000 assembly, the LINK and UNLK instructions are used tofacilitate the creation/destruction of local subroutine storage usingstack frames.At the end of a LINK instruction, the old value of address register. An has been pushed on the stack and the new An is pointing at. Page 29. 29. The 68000's

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