LEARN MORE...

Home
Documents
July 2021
31
Provide examples of three different x86 instruction mnemonics Brief

Provide examples of three different x86 instruction mnemonics Brief

Content type

User Generated

Uploaded By

qewnpx9256

Pages

Showing Page:

1/4

Provide examples of three different x86 instruction

mnemonics. Briefly explain what are the assembly

language components? Instruction mnemonic Directive

Label Comments Do assembly language directives

execute at run time? Convert the following C program to

x86 assembly code. Use 8086 instruction set.

Solution

1) The examples of three different x86 instruction

mnemonics are:

Instruction mnemonic:

It is a word used in assembly language to represent a

binary machine instruction operation code. Different

processors have different instruction sets and so use

different set of mnemonics to represent them.

The different set of Instruction mnemonics are:

Directive:

Directives are the commands that are a part of

assembler syntax but are not related to x86 processor

instruction set. All assembler directives begin with a

period(.).

Some of the assembler directives are:

Showing Page:

2/4

Label:

A label can be placed at the beginning of the statement. In

assembly language label is assigned the current value of

active location counter and serves as instruction operand.

Labels are of two types. They are numeric label and

sybolic label. Each label represents a memory address in

assembly language. The address may be address of data

or address of an instruction.

Comments:

Compared to high level languages comments are more

important for assembly languages. Comments are needed

not only for others to understand your code but it is more

important for you to read the comment and understand the

code. Comments are needed when debugging. Comments

are needed to check that you have correct algorithm and to

check the assembly language code implements it correctly.

There are four types of comments. They are:

3) Assembly language directives do not execute at run

time because directives do not represent machine

instructions. They just direct the assembler to do

something while translating the program to machine code,

like to allocate space to a variable and give it a initial

value.

.Ltext0:

Showing Page:

3/4

End of Preview - Want to read all 4 pages?

Access Now

Unformatted Attachment Preview

Provide examples of three different x86 instruction mnemonics. Briefly explain what are the assembly language components? Instruction mnemonic Directive Label Comments Do assembly language directives execute at run time? Convert the following C pro gram to x86 assembly code. Use 8086 instruction set. Solution 1) The examples of three different x86 instruction mnemonics are: 2) Instruction mnemonic: It is a word used in assembly language to represent a binary machine instruction operation code. Different processors have different instruction sets and so use different set of mnemonics to represent them. The different set of Instruction mnemonics are: Directive: Directives are the commands that are a part of assembler syntax but are not related to x86 processor instruction set. All assembler directives begin with a period(.). Some of the assembler directives are: Label: A label can be placed at the beginning of the statement. In assembly language label is assigned the current value of active location counter and serves as instruction operand. Labels are of two types. They are numeric label and sybolic label. Each label represents a memory address in assembly language. The address ...
Purchase document to see full attachment