a)HLL b) 68K x:=x+1 ADDQ.W #1,X IF A=7 THEN CMPI.W #7,A B:=3; BNE NEXT C:=4; MOVEQ #3,B END IF MOVEQ #4,C x:=X+2; NEXT: ADDQ.W #2,X b) At. Programmation Structurée En Assembleur by J.-P. Malengé, S. Albertsen, P. Collard and L. Andréani Masson, Paris, pages. ABCD. Operation: Source(base 10) + Destination (base 10) –>; Destination. Compatibility: Family. Assembler Syntax: ABCD Dy, Dx ABCD -(Ay), -(Ax).
|Published (Last):||24 August 2005|
|PDF File Size:||17.23 Mb|
|ePub File Size:||19.15 Mb|
|Price:||Free* [*Free Regsitration Required]|
Wikipedia has more about this subject:.
IFs, LOOPs and DBRA
Determines which stack mode to use if S is set. This may change the size of the label, in which case a third pass will be needed, and so on. Some instructions only accept one or the other of near or far absolute addresses, thus the separation. After the instruction, both registers contain the same information. First decreases A0 with 4 size of operandthen copies the long word starting at address stored in A0 to D2.
Copies the long word starting at address location stored in A0 you say A0 points to the long word. When it encounters one, it assigns it the current value of the assembler’s PC. Only the lower byte is accessible in user mode, and of this, only the first five bits are useful. Wherever you see “cc” in an instruction, you should replace it with the appropriate conditional test code.
Usually, it just uses assemblsur known safe value like the current PCflags the location, and makes a second pass to substitute the real value.
From Wikibooks, open books for an open world.
The assembler you use may have different behavior. Other than that, I don’t know how this works. Like absolute near, you can include the parentheses at your discretion. Detailed descriptions of every instruction in the MC family can be found in the Programmer’s Reference Manual.
The only exception is byte operations on A7 – this register must point to an even address, so it will always assembleur by at least 2. Scale is not supported on all devices. Retrieved from ” https: W easier to read.
One thing to note is that the PowerPC is not binary compatible with the 68K processor.
Assembly – Wikibooks, open books for an open world
You can write this either with or without the parentheses, and most assemblers can take either one. However, Apple has written an emulator in PowerPC assembly language which allows PowerPC microprocessors to interpret machine language code written for 68K microprocessors, albeit with xssembleur substantial performance decrease versus native PowerPC machine language.
Normally the processor is in user mode. You can ask for help in dividing this book in the assistance reading room.
If set, trace is allowed on any instruction. These addressing modes perform two memory accesses – first a read in to a table of addresses, second the actual read or write. If set, look at M to determine what assemnleur SP points to.
Some assemblers won’t take certain syntaxes. Same as above, but another register will also be added.
Assemblrur whole A1 to D0. On theonly the lower 24 bits output to any pins, giving a maximum addressing range of 16MiB. Note that you can reference labels before they’re actually declared. Scale can be 6800, 2, 4, or 8. This bit is always cleared on processor models lower than Take care with this!!! You can help by splitting this big page into smaller ones.
Operate on the location pointed to by xxx. All syntaxes are equivalent, but some assemblers won’t take them all. Most instructions can operate on all data sizes, and very few are restricted to less than three addressing modes.
Refer to this table for what each test does. It can also be used as a pointer in PC relative addressing modes. When the instruction is executed, both registers will contain the same information. Note that there is no postdecrement or preincrement addressing mode.
Labels are simply names for lines. The Program Counter PC points to the current instruction. Same as indirect addressing, but An will be increased by the size of the operation after the instruction is executed. Their assembly languages are completely different. The assembler handles labels as aliases for numbers.
Langage de programmation – Assembleur – Référence d’instructions Motorola x0 par OpCode
This document contains information on how to program the Motorola 68K-series assemblleur in assembly language. The only instructions that are allowed to use this addressing mode are: When moving a byte or a word, the upper part of the register will remain unchanged.
Typically, there are only a few places you’ll want to refer to, asembleur example the starting points of functions, loop starts and loop ends, and certain data storage locations.