Computer Architecture and Assembly Language Quiz
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Questions and Answers

Which of the following items generates executable/object code?

  • Text Editor
  • Compiler (correct)
  • Debugger
  • Assembler (correct)

    • The FLAGS register in an X86 CPU is 32 bits in size.

    False

    What is the hexadecimal value in DL if EDX contains 805FD1C6?

    C6

    The CPU component responsible for performing arithmetic calculations is called the ______.

    <p>ALU</p> Signup and view all the answers

    Match the following registers with their sizes:

    <p>R15D = 32 BH = 8 FLAGS = 16 RIP = 64</p> Signup and view all the answers

    Which of the following is NOT a valid segment register in an X86 CPU?

    <p>BS</p> Signup and view all the answers

    Main memory is considered a part of the CPU.

    <p>False</p> Signup and view all the answers

    How many general-purpose registers are there in a 64-bit system?

    <p>16</p> Signup and view all the answers

    What is the minimum number of hexadecimal digits in an object's code for any valid instruction?

    <p>2</p> Signup and view all the answers

    The instruction 'cmp' is associated with the EFLAGS register.

    <p>True</p> Signup and view all the answers

    What is the object code for the instruction 'INC EDX' in upper case hexadecimal?

    <p>42</p> Signup and view all the answers

    The instruction 'loop' uses the register __________.

    <p>ECX</p> Signup and view all the answers

    Match the register to its corresponding instruction:

    <p>EAX = cbw EIP = Any assembly instruction ECX = loop EFLAGS = cmp</p> Signup and view all the answers

    Which of the following jump types is true for the object code E9 B102A134?

    <p>Relative Near Jump</p> Signup and view all the answers

    206 in decimal is represented as 3032 in the base-4 number system.

    <p>True</p> Signup and view all the answers

    How many bytes will be allocated for the declaration 'array1 DWORD 25, 47, 15, 50, 32, -30, 38'?

    <p>28</p> Signup and view all the answers

    Which directive is not necessary for a 64-bit assembly program?

    <p>.MODEL FLAT</p> Signup and view all the answers

    You can define a macro with more than 4 parameters.

    <p>True</p> Signup and view all the answers

    How many bytes are allocated for the declaration 'myVar2 QWORD -105, 20, -29'?

    <p>24</p> Signup and view all the answers

    The hexadecimal value for 'num WORD -1' is _____ (enter without prefix or suffix).

    <p>FFFF</p> Signup and view all the answers

    Match each symbol to its purpose:

    <p>. = Directive : = Label , = Parameters ; = Comment</p> Signup and view all the answers

    Which of the following can validly replace 'XXXXXX' in the declaration 'value XXXXXX 246'?

    <p>DWORD</p> Signup and view all the answers

    You cannot have comments within a macro definition.

    <p>False</p> Signup and view all the answers

    What is the matching number system for the suffix notation 'H'?

    <p>Hexadecimal</p> Signup and view all the answers

    Which of the following instructions will leave the same result in AL when the value of x is set to 8?

    <p>Both A and B</p> Signup and view all the answers

    The result of the instruction 'shl EAX, 2' on AL with a value of 10100101 will be 01001010.

    <p>True</p> Signup and view all the answers

    What will be the result of the operation '10100100 XOR 10010001'?

    <p>00110101</p> Signup and view all the answers

    To multiply EDX by 64 using a shift operation, the instruction would be 'shl EDX, ___'.

    <p>6</p> Signup and view all the answers

    Match the assembly instructions with their characteristics:

    <p>stosb = Uses EDI cmpsb = Uses both ESI and EDI lodsb = Uses ESI but not EDI std = Uses neither ESI nor EDI</p> Signup and view all the answers

    Which of the following registers will be updated after the instruction 'test EDX, 150' is executed?

    <p>EFLAGS</p> Signup and view all the answers

    Using a repeat prefix with 'lods' in an assembly instruction is sensible.

    <p>False</p> Signup and view all the answers

    How many times should a loop iterate to copy 200 bytes using 'movsd'?

    <p>50</p> Signup and view all the answers

    What does the instruction represented by the object code '8B 15 00000000 R' indicate?

    <p>Instruction contains a direct memory reference</p> Signup and view all the answers

    MOV AL, 24 followed by ADD AL, 110 will not set the Carry Flag.

    <p>False</p> Signup and view all the answers

    What will be the hexadecimal value of AX after executing MOV AL, -5 and IMUL AL?

    <p>FFFD</p> Signup and view all the answers

    If the MOD R/M byte of an object code is 15, the register used is _____ .

    <p>EBX</p> Signup and view all the answers

    Match the following object codes with their descriptions:

    <p>48/F7 EO = Instruction contains a 64-bit operand C3 = Object code consists of one byte only 66|03 C2 = Instruction contains a word size operand 8B 15 00000000 R = Instruction contains a direct memory reference</p> Signup and view all the answers

    Which of the following describes what happens when executing INC BL after moving OFFh into BL?

    <p>BL will contain 01</p> Signup and view all the answers

    What is the maximum number of parameters that can be passed to a 64-bit procedure via registers?

    <p>4</p> Signup and view all the answers

    In a 64-bit program, any register can be modified freely by a called procedure.

    <p>False</p> Signup and view all the answers

    What will the ECX register hold after the instruction 'mov 26, ECX'?

    <p>None of the mentioned</p> Signup and view all the answers

    A carry out from the most significant bit in binary addition indicates overflow.

    <p>False</p> Signup and view all the answers

    What assembly instructions will calculate the expression 9 - y - 2x and store it in EAX?

    <p>mov eax, 9; sub eax, ebx; shl eax, 1; sub eax, eax;</p> Signup and view all the answers

    The hexadecimal ASCII value for the character 'k' is ______.

    <p>6B</p> Signup and view all the answers

    Match the following hexadecimal numbers with their sign:

    <p>5FF1 = Positive D004 = Negative 8001 = Negative 7FA8 = Positive</p> Signup and view all the answers

    How many words are in a quadword?

    <p>4</p> Signup and view all the answers

    What is the lowest possible signed value in a byte?

    <p>-128</p> Signup and view all the answers

    The little endian form of the hex number 90CD8A9C is ______.

    <p>9C8ACD90</p> Signup and view all the answers

    Study Notes

    X86 Assembly Instruction Summary

    • Various X86 assembly instructions are used for different tasks.
    • Understanding the operands and their roles is crucial for interpretation.
    • Instructions like MUL require implicit operands.
    • Converting decimal to hexadecimal and handling little-endian format is a common task.
    • Different data sizes (BYTE, DWORD) have implications for assembly code.

    Assembly Code Snippet Analysis

    • Analyzing assembly code snippets is important for determining instruction lengths.
    • Understanding data size (byte or dword) plays a role in instructions.
    • Knowledge of assembly instructions (e.g., mov, sub, dec, mov) is needed for accurate interpretation.
    • Assembly language often includes comments detailing the code's logic ('R' often indicates the presence of relocation information).
    • Different addressing modes exist in assembly languages, and identifying them is essential.
    • A common addressing mode noted is Memory-Register Indirect.

    Arithmetic and Conversion Instructions

    • Converting decimal numbers to hexadecimal and vice versa is a standard programming task.
    • Using hexadecimal provides a concise representation of data values.

    Register Usage and Matching

    • Different registers have different functions in assembly programming.
    • Some registers are crucial for specific instructions, and their role should be understood.

    Object Code Digits and Assembly Statements

    • Certain instructions have specific length in hexadecimal code.
    • Specific assembly instructions are identified by code sequences in memory.

    ASCII Sequence Interpretation

    • Converting ASCII sequences to strings.
    • Combining ASCII values into a textual representation.

    Conditional Statements and Assembly Code

    • Performing conditional operations in assembly code and the associated instructions are important to create complex procedures.
    • IF and ELSE constructs, though pseudocode concepts, must be translated into specific instructions for a targeted assembly language implementation.

    Binary Addition and Overflow

    • Recognizing the implication of carry-out in binary addition is essential for understanding overflow conditions.

    Data Declaration and Allocation Bytes

    • Different data types (DWORD, QWORD, WORD) in assembly declaration have different sizes.
    • Allocating the appropriate amount of memory for declarations is vital.

    Operand Addressing Modes

    • Different operand addressing modes (e.g., register, immediate, register indirect) exist in assembly language.
    • Using correct addressing modes is important to correctly execute data-related instructions.

    Instruction Classification and Execution

    • Instructions and their types (MOV, CMP, MUL) are classified based on their properties and usage.
    • Instructions and the associated result of executing the instruction may be determined with analysis.

    Register Size and Matching

    • Different registers have specific bit-sizes (in bits).

    General-Purpose Registers in 64-bit Systems

    • Determining the number of 64-bit registers used for general programming purposes is essential.

    32-bit System Registers

    • Identifying registers used for storing program counters in 32-bit systems is essential.

    Instruction Reference and Operand Type

    • Understanding the syntax and functionality of instructions such as MOV, IMUL, CBW

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    Description

    Test your knowledge on computer architecture and assembly language with this quiz. Covering topics such as CPU registers, object code, and instruction sets, this quiz will challenge your understanding of how processors work. Perfect for students in computer science or engineering courses.

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