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Instruction Sets: Characteristics and Functions. Addressing Modes. What is an Instruction Set? The complete collection of instructions that are understood by a CPU; Machine language: binary representation of operations and (addresses of) arguments Ring 0 on 80386+; Kernel mode Example: Y=(A-B):[(C+(DxE)].
Chapter 17 80386 Instruction Set. This chapter presents instructions for the 80386 in alphabetical order. For each instruction, the forms are given for each operand combination, including object code produced, operands required, execution time, and a description. For each instruction, there is an operational description and
20 Dec 2014 The second form is for 32-bit operands and is included in the 80386 instruction set. For example, consider BOUND EDI, AD DR. Suppose (ADDR) = 32-bit lower bound d1 and (ADDR + 4) = 32 bit upper bound d". If, after execution of this instruction, (EDI) <d1 or>d, the 80386 traps to interrupt 5; otherwise,
A register can be used as both the source and destination of the instruction. Registers are very fast for most operations so maximum use must be made thereof. examples: mov ax,bx mov ax,10h mov si,es:[bx]; Direct Memory Addressing A memory location can be used by using its address as the operand in an instruction.
Most books you will find on this subject are geared toward PC based assembly language products using the Intel 803x6 instruction set. The GNU This also applies to variables, for example, if the variable doscall is set to 0x21, then $doscall refers to the number 21, while doscall refers to memory offset 21. The size of
BTR, Bit test and reset. BTS, Bit test and set. CDQ, Convert double-word to quad-word, Sign-extends EAX into EDX, forming the quad-word EDX:EAX. Since (I)DIV uses EDX:EAX as its input, CDQ must be called after setting EAX if EDX is not manually initialized (as in 64/32 division) before
contain an 80386sx or later processor. This text often uses the 80386 instruction set in vari- ous example programs. Keep in mind, though, that this is only for convenience. There is no program that appears in this text that could not be recoded using only 8088 assembly language instructions. A word of advice, particularly to
up: Chapter 3 -- Applications Instruction Set prev: 3.3 Decimal Arithmetic The Boolean operation instructions; Bit test and modify instructions; Bit scan instructions; Rotate and shift instructions; Byte set on condition . For example, when IDIV is used to divide -9 by 4, the result is -2 with a remainder of -1. If SAR is used to
This chapter describes the signals and operation of the Intel 80386SX processor bus and describes a subset of the While it's not possible to cover all the details of the 80x86 instruction set you should learn enough about it to be able to write simple routines to . Figure 1: Examples of 80386SX Bus Cycles. Thus BHE* and
The Intel 80386, also known as i386 or just 386, is a 32-bit microprocessor introduced in 1985. The first versions had 275,000 transistors and were the CPU of many workstations and high-end personal computers of the time. As the original implementation of the 32-bit extension of the 80286 architecture, the 80386
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