Table of Contents
- 1 What are assembler directives explain 4 assembler directives in detail?
- 2 What are assembler directives list any four assembler directives and its usage?
- 3 What are the advanced assembler directives?
- 4 What is the purpose of the origin directive?
- 5 What is the need of assembler directives?
- 6 Which type of errors are detected by the assembler?
- 7 How are directives used in an assembler program?
- 8 What is the quad word directive in assembler?
What are assembler directives explain 4 assembler directives in detail?
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. Control the appearance of listings.
What are assembler directives list any four assembler directives and its usage?
Table 5-1: Summary of Assembler Directives
| Category | Directives |
|---|---|
| Compiler-Use-Only Directives | .bgnb .endb .file .gjsrlive .gjsrsaved .lab .livereg .loc .option .ugen .vreg |
| Location Control Directives | .align .data .rdata .sdata .space .text |
| Symbol Declaration Directives | .extern .globl .struct symbolic equate .weakext |
What are assembler directives explain with example?
Assembler directives- These are the statements that direct the assembler to do something. As the name says, it directs the assembler to do a task. The specialty of these statements is that they are effective only during the assembly of a program but they do not generate any code that is machine executable.
What are assembler directives list any three assembler directives in SIC machine?
Assembler directives (or pseudo opcodes): START, END, BYTE, WORD, RESB, RESW, BASE and NOBASE.
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 =) This is used to set the program or register address during assembly. For example, ORG 0100h tells the assembler to assemble all subsequent code starting at address 0100h.
What is the purpose of the origin directive?
| Q. | The purpose of the ORIGIN directive is |
|---|---|
| B. | to indicate the starting of the computation code |
| C. | to indicate the purpose of the code |
| D. | to list the locations of all the registers used |
| Answer» a. to indicate the starting position in memory, where the program block is to be stored |
What is the need for an assembler directives?
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.
Why are assembler directives required?
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 is the need of assembler directives?
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.
Which type of errors are detected by the assembler?
Detailed Solution. The correct answer Logical Error. A logic error (or logical error) is a mistake in a program’s source code that results in incorrect or unexpected behavior. It is a type of runtime error that may simply produce the wrong output or may cause a program to crash while running.
Which directive is used to specify the starting of the program address?
EQU directives are typically placed at the beginning of an assembly program. * OFFSET – The OFFSET directive declares an offset section and initializes the location counter to the value specified in expression following offset.
What are called assembler directives give two examples?
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).
How are directives used in an assembler program?
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. It consists of two types of statements: instructions and directives.
What is the quad word directive in assembler?
Define Quad word [DQ]- This directive is used to tell the assembler to declare variable 4 words in length or to reserve 4 words of storage in memory. Define Ten bytes [DT]- It is used to define the data items that are 10 bytes long.
How are directives used in Motorola assembly language?
Directives are NOT part of the Motorola assembly language machine instructions, such as ‘ldaa’ or ‘movb’. Machine instructions generate machine code, assembler directives do not. Directives are used essentially in a pre-processing stage of the assembly process.
What are the four elements of assembler syntax?
There are four elements to assembly syntax: labels, directives, instructions, and comments. Directives are used mainly to define symbols, allocate storage, and control the behavior of the assembler. The most common assembler directives were introduced in this chapter, but there are many other directives available in the GNU assembler.