Assembler directives
supply data to the program and control the assembly process
. Assembler directives enable you to do the following: Assemble code and data into specified sections. Reserve space in memory for uninitialized variables. … Specify libraries from which the assembler can obtain macros.
What are assembler directives in microprocessor?
An assembler directive is
a statement to give direction to the assembler to perform task of the assembly process
. … They indicate how an operand or a section of the program is to be processed by the assembler. An assembler supports directives to define data, to organise segments to control procedure, to define macros.
What are assembler directives explain?
Definition: Assembler directives are the instructions used by the assembler at the time of assembling a source program. More specifically, we can say, assembler directives are
the commands or instructions that control the operation of the assembler.
What are the different types of assembler directive?
- Assemble code and data into specified sections.
- Reserve space in memory for uninitialized variables.
- Control the appearance of listings.
- Initialize memory.
- Assemble conditional blocks.
- Define global variables.
- Specify libraries from which the assembler can obtain macros.
What is purpose of assembler directive?
The assembler directives
control organization of the program and provide necessary information to the assembler to understand assembly language programs to generate machine codes
. They indicate how an operand or a section of program is to be processed by the assembler.
What are assembler directives give example?
Directives are instructions used by the assembler to help automate the assembly process and to improve program readability. Examples of common assembler directives are
ORG (origin), EQU (equate), and DS. B (define space for a byte)
.
What is difference between assembler directives and instructions?
Answer: Assembler instruction generates machine code, thus contributes towards the size of the program .
Assembler directive does not create any machine code
,thus does not contribute to program size.It directs the assembler to perform certain actions during assembly phase.
What is difference between macro and procedure?
A macro is used for a small number of instructions; mostly, less than ten instructions, while
a procedure is used for a large number of instructions; mostly, higher than ten instructions
. Hence, this is the main difference between macro and procedure.
Which directive ends a procedure?
The ENDP directive
marks the end of the main procedure.
Which assembler directive is used in FAR procedure?
The
PROC directive
is used to identify the start of a procedure. The PROC directive follows a name you give the procedure. After the PROC directive, the term near or the term far is used to specify the type of the procedure.
What do you mean by assembler directive write all assembler directives with their meanings?
Assembler directives are
directions to the assembler to take some action or change a setting
. Assembler directives do not represent instructions, and are not translated into machine code. … data directive tells the assembler that information that follows is program data.
What are directives in 8086?
Introduction: Assembler directives are
the directions to the assembler which indicate how an operand or section of the program is to be processed
. These are also called pseudo operations which are not executable by the microprocessor.
What are the advanced assembler directives?
Assembler directives are
instructions that direct the assembler to do something
. Assigns a value to a symbol (same as =) Sets the current origin to a new value. … For example, ORG 0100h tells the assembler to assemble all subsequent code starting at address 0100h.
Which directive is used to define constants?
The %define Directive
The above code replaces PTR by [EBP+4]. This directive also allows redefinition and it is case-sensitive.
Which directive is used to end the program module?
Explanation:
The directive END
is used to denote the completion of the program. Explanation: The directive ENDS is used to end a segment where as the directive END is used to end the program. Explanation: The directive updates location counter to next even address if the current location counter contents are not even.
What directives indicate the start and end of a procedure?
The PROC and ENDP directives
mark the beginning and end of a procedure. In a NEAR procedure, both calling and called procedures are in the same code segment. Called and calling procedures are in two different segments in a FAR procedure.
