Contents
- 1 What does DUP mean in assembly?
- 2 What is the use of DUP in assembly language?
- 3 What does a DUP operator do?
- 4 What is DB in assembly language?
- 5 What is the purpose of origin directive?
- 6 What is DB and DW in assembly language?
- 7 Are there different assembly languages for x86 machines?
- 8 How many operands are there in assembly language?
What does DUP mean in assembly?
The DUP directive tells the assembler to duplicate an expression a given number of times. For example, 4 DUP(2) is equivalent to 2, 2, 2, 2.
What is the use of DUP in assembly language?
DUP is a specific operand specifier to the DB / DW /etc psuedo-instructions, telling them to repeat a specific value. TIMES is a generic instruction prefix, telling the assembler to produce multiple copies of the instruction (or psuedo-instruction), whatever it may be. …
What is the meaning of Y DB 8 dup (?)?
STACK16_SIZE dup (?) means to duplicate the data in parenthesis by STACK16_SIZE times.
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 does a DUP operator do?
The DUP operator is very often used in the declaration of arrays This operator works with any of the data allocation directives. the count value sets the number of times to repeat all values within the parentheses.
What is DB in assembly language?
DB = define byte size variables. DW = define word size (16 bits) variables. DD = define double word size (32 bits) variables.
What does the DUP operator do?
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 the purpose of origin directive?
Explanation: The directives help the program in getting compiled and hence won’t be there in the object code. Explanation: This basically is used to replace the variable with a constant value. Explanation: This does the function similar to the main statement.
What is DB and DW in assembly language?
What is the meaning of DUP in assembly language?
DUP is a specific operand specifier to the DB / DW /etc psuedo-instructions, telling them to repeat a specific value. It can only be used in these data instructions. TIMES is a generic instruction prefix, telling the assembler to produce multiple copies of the instruction (or psuedo-instruction), whatever it may be.
What does DUP mean in db / dw / etc?
DUP is a specific operand specifier to the DB / DW /etc psuedo-instructions, telling them to repeat a specific value. It can only be used in these data instructions.
Are there different assembly languages for x86 machines?
This guide describes the basics of 32-bit x86 assembly language programming, covering a small but useful subset of the available instructions and assembler directives. There are several different assembly languages for generating x86 machine code.
How many operands are there in assembly language?
Assembly language instructions can have between zero and three operands, each of which can be a register, memory operand, constant expression, or I/O port. • constant (immediate value): ex. 96 • constant expression: ex. 10 * 10 • register: ex. eax