x86-64 Assembly Language Programming with Ubuntu – Ed Jorgensen [47-50]

Created by KIRO

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How are hexadecimal values specified in assembly language?

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They are preceded with '0x'.

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Numeric Value Representation

How are hexadecimal values specified in assembly language?

They are preceded with '0x'.

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Program Formatting Requirements

What are the main parts of a properly formatted assembly source file?

Data section, BSS section, and Text section.

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Data Section Structure

What is the purpose of the data section in an assembly program?

To declare and define initialized data.

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Numeric Value Representation

How are octal values specified in assembly language?

They are followed by 'q'.

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Numeric Value Representation

How is the octal number 511 represented in assembly language?

As 777q.

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Numeric Value Representation

What is the default radix for numbers in assembly language?

Decimal (base-10).

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Defining Constants in Assembly

How are constants defined in assembly language?

Using the format equ .

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Defining Constants in Assembly

Can the value of a constant be changed during program execution?

No, it cannot be changed.

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Defining Constants in Assembly

What happens to constants during the assembly process?

They are substituted for their defined values.

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Data Section Structure

What section must initialized data be declared in?

The 'section .data' section.

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BSS Section for Uninitialized Data

What does the BSS section in an assembly program represent?

It is where uninitialized data is declared.

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Data Section Structure

What must variable names start with in assembly language?

A letter.

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Text Section for Code Placement

What is the function of the text section in an assembly program?

It is where the code is placed.

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Comments in Assembly Language

How are comments indicated in assembly language using yasm?

By using a semicolon (;).

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Comments in Assembly Language

Can comments be placed anywhere in the code?

Yes, comments can be placed anywhere, including after an instruction.

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Data Section Structure

What is the general format for variable definitions in assembly language?

.

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Supported Data Types in Assembly

What is the supported declaration for an 8-bit variable in assembly language?

db.

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Program Formatting Requirements

What are the primary assembler directives for initialized data declarations?

dw for 16-bit variables, dd for 32-bit variables, dq for 64-bit variables, ddq for 128-bit integers, and dt for 128-bit floats.

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Program Formatting Requirements

How are initialized arrays defined in assembly language?

Initialized arrays are defined with comma-separated values.

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BSS Section for Uninitialized Data

What is the general format for declaring uninitialized data in the BSS section?

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BSS Section for Uninitialized Data

What must variable names start with in the BSS section?

A letter followed by letters or numbers, including some special characters like the underscore.

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Program Formatting Requirements

What happens if a byte-sized variable is defined with a value that exceeds its limit?

It would generate an assembler error.

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Examples of Variable Declarations

Provide an example of a 32-bit float declaration in assembly language.

flt1 dd 3.14159.

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BSS Section for Uninitialized Data

What is the purpose of the BSS section in assembly language?

To declare uninitialized data.

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BSS Section for Uninitialized Data

What is the significance of the space after the word 'section' in the BSS section?

It is required for proper declaration of the section.

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Supported Data Types in Assembly

What are the supported data types for uninitialized data declarations in assembly?

resb (8-bit), resw (16-bit), resd (32-bit), resq (64-bit), resdq (128-bit).

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Defining Constants in Assembly

What does the directive 'resb' represent?

It represents 8-bit variable(s).

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Text Section for Code Placement

What is the purpose of the 'section .text' in an assembly program?

It is where the code is placed and instructions are specified.

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Text Section for Code Placement

What must be included to define the initial program entry point in an assembly program?

The declaration 'global _start' and the label '_start:'.

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Text Section for Code Placement

How should instructions be specified in the text section?

One per line, each must be a valid instruction with the appropriate required operands.

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Text Section for Code Placement

What is required to terminate an assembly program?

A system service should be used to inform the operating system to terminate the program and recover resources.

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Examples of Variable Declarations

Can allocated arrays in assembly be initialized to specific values?

No, the allocated array may not be initialized to any specific value.

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