Assembly Language for x86 Processors, 6E Kip R Irvine Test Bank

Type:

Test Bank

Resource:

Assembly Language for x86 Processors

Edition:

6th Edition

Author(s):

Kip R. Irvine

Chapter 1 Test Bank Note to instructors: To view the answers, select Tools | Options | View | Hidden Text in MS-Word.

Fill in the Blanks and Short Answer 1.

Which popular programming language is well-known for executing its target programs on a virtual machine?

2.

Translate the following decimal numbers to binary: a. 34 b. 18 c. 6 d. 73

3.

Translate the following decimal numbers to hexadecimal: a. 75 b. 97 c. 258 d. 76

4.

Add the following binary integers: 00101101 and 00111011

5.

Form the 8-bit two's complement of each binary integer: a. 11111111 b. 11111000 c. 11110000 d. 11110001

6.

Translate the following signed decimal numbers to binary: a. −35 b. −78 c. −7 d. −

7.

Convert the following string to a sequence of hexadecimal ASCII codes: "BW654"

Multiple-Choice (Some of the following questions have more than one correct answer. Circle all correct answers.)

8.

A program that combines object files into an executable program is called a _________. a. compiler b. loader

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c. linker d. assembler 9.

If virtual machine V2 is radically different that virtual machine V1, what major problem results when we try to run V2 programs on machine V1? a. translation is too difficult b. machine V2 cannot run V1 programs c. V1 would have to be written in microcode d. V2 would have to be implemented by software

10. Which of the following correctly describes the Java Virtual Machine? a. executes Java Bytecodes b. translates Java into Java Bytecodes c. provides virtual memory management for the operating system d. makes Java run faster on x86 computers 11. What is the value of the booloean expression X  (Y  Z), when X=true, Y=false, and Z=false? a. true b. false 12. Is the expression X  (Y  Z) equivalent to (X  Y)  (X  Z) for all possible inputs of X, Y, and Z? a. yes b. no 13. The following C++ expression cannot be written in assembly language code.

X = (Y + 4) * 3; a. true b. false 14. Three hexadecimal digits can be used to represent 12 binary bits. a. true b. false 15. The most significant bit in a binary byte is numbered bit 8. a. true b. false 16. A quadword is 4 bytes. a. true b. false 17. A word (on x86 systems) is 16 bits. a. true

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b. false 18. A doubleword (on x86 systems) is 32 bits. a. true b. false 19. A signed integer stores the sign in the least significant bit (LSB). a. true b. false 20. If an integer's sign bit is 1, the integer is positive. a. true b. false 21. A signed byte can be equal to +127. a. true b. false 22. The ASCII codes for alphabetic letters are smaller than for decimal digits. a. true b. false 23. The expression X  Y is true only when X and Y are both true. a. true b. false 24. The expression X  Y is only true when X and Y are both true. a. true b. false 25. The expression (X  Y) is true when X and Y are both false. a. true b. false 26. The three most basic operators in Boolean algebra are AND, OR, and NOT. a. true b. false 27. The integer range of standard ASCII codes is: a. −128 to +127 b. 0 to 127 c. 0 to 270 d. 0 to 65,535 28. How many bits are used by Unicode characters in MS-Windows?

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a. 7 b. 8 c. 16 d. 24 29. Which type of program must usually run on multiple platforms? a. device driver b. business application c. embedded system d. assembler 30. Which of the following best describes the relationship between assembly language and machine language? a. one to many b. one to one c. many to one d. many to many 31. A program is considered portable if it . . . a. can be rewritten in a different programming language without losing its meaning. b. can be quickly copied from conventional RAM into high-speed RAM. c. can be executed on multiple platforms. d. none of the above 32. Device drivers nearly always contain some code written in a. machine language b. assembly language c. Java d. an application-oriented language 33. Which of the following are embedded systems applications? a. an accounting program b. a javascript program running on a Web page c. a video game for a dedicated console d. a phone book searching program in a cellular phone 34. Suppose a program written in language L1 must be executed on a machine running a program running in language L0. What important operation must take place? a. translation of the entire L1 program into L0 code b. translation of the L0 program into L1 code c. creation of a language L3 that interprets L0 instructions d. interpretation of each L1 statement using L0 code as the L1 program is running

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35. Machine language instructions are found at which virtual machine level? a. digital logic level b. ISA level c. assembly language level d. operating system level 36. Which language (or virtual machine) uses short mnemonics such as ADD and SUB to identify instructions? a. conventional machine language b. ISA-level language c. assembly language d. Java Virtual Machine 37. What is the largest unsigned integer that may be stored in 24 bits? a. 32,767 b. 65,536 c. 1,048,575 d. 1,048,576 38. What is the largest signed integer that may be stored in 32 bits? a. 232 − 1 b. 232 c. 231 − 1 d. 231 39. The two's complement of an integer is formed by doing which of the following? a. reversing (inverting) the bits and adding 1 b. adding 1 and reversing the bits c. adding 2 and reversing the bits d. changing the highest bit to a 1 40. Which list contains the correct hexadecimal translation (in order) of the following unsigned decimal integers? 33, 95, 257 a. 21, 5F, 101 b. 22, 5E, 11A c. 6A, 5F, 101 d. 21, 62, 103 41. Which of the following binary values is equivalent to hexadecimal 4A2B? a. 0100 1010 0010 1101 b. 0100 1010 0010 1011 c. 0100 1010 0010 1011

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d. 0110 1011 0010 1001 42. Which of the following binary values is equivalent to hexadecimal 7CBE? a. 0111 1101 1011 1110 b. 0111 1011 1011 1100 c. 0111 1100 1100 1110 d. 0111 1100 1011 1110 43. Which of the following is the binary translation of signed decimal −33 ? a. 11011111 b. 10101011 c. 11001100 d. 11100011

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Chapter 2 Test Bank Note to instructors: To view the answers, select Tools | Options | View | Hidden Text in MS-Word.

Fill in the Blanks and Short Answer 1.

Which internal bus uses binary signals to synchronize actions of all devices attached to the system bus?

2.

Which unit in the X86 instruction cycle receives machine instructions from the Bus Interface Unit and inserts them into the instruction queue?

3.

Which unit in the X86 instruction cycle performs page protection checks?

4.

Which component of an operating system is responsible for switching control between tasks?

5.

Identify three types of segments that would be referenced by segment registers.

6.

If you were to multiply 1.5 by 2.6, which part of the CPU would you use?

7.

Name two RISC-like features incorporated by Intel into the X86 family.

8.

In the Flat segmentation model, which table holds the addresses of segments?

9.

List at least five types of ports found on a typical PC motherboard.

10. Which support processor synchronizes the CPU and the rest of the computer?

11. Which support processor transfers data to the printer?

12. Why are serial ports typically slower than parallel ports?

Multiple-Choice 13. Which two 32-bit registers are known as extended index registers? a. SI, DI b. EAX, EBX c. ESI, EDI d. EBP, ESP 14. What is the name of the lowest 8 bits of the EDX register? a. DL b. DH c. DX d. none of the above 15. How much memory can be addressed in Real-address mode? a. 640 K b. 1 MB c. 16 MB

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d. 4 GB 16. How much memory can be addressed in Protected mode? a. 640 K b. 1 MB c. 16 MB d. 4 GB 17. What special feature makes VRAM better-suited to use with a video adapter than DRAM? a. VRAM uses static RAM b. VRAM is dual-ported c. VRAM does not require a refresh cycle d. VRAM holds its memory when power is turned off 18. Which of the following linear addresses matches the segment-offset address 08F0:0200? a. 09100h b. 09200h c. 0AF0h d. 08F2h 19. Which type of I/O device uses the 16550 UART chip? a. USB port b. printer port c. serial port d. parallel port 20. If you wanted to turn a device on and off using computer software, which type of port interface would be best? a. USB b. keyboard c. serial d. parallel 21. What is the name of the bus architecture commonly used with Pentium processors? a. ISA b. PCI c. EISA d. RAM-BUS 22. Segment-offset addressing is used in which processor mode(s)? a. Protected b. Virtual-8086 c. Real-address

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d. System management 23. How is Virtual-8086 mode similar to Real-address mode? a. permits the use of virtual memory (paging) b. uses a segment descriptor table to track memory usage c. uses only 16-bit registers for input-output d. simulates 8086-based computer running in Real-address mode 24. High-speed memory that reduces the frequency of access by the CPU to conventional memory is called a. local memory b. cache memory c. system memory d. virtual memory 25. Why are device drivers needed, given that BIOS programs can do the same task? a. device drivers allow for the introduction of new devices b. device drivers have faster performance than BIOS programs c. BIOS programs are only used by the operating system in Real-address mode d. device drivers have more direct access to hardware than BIOS programs 26. If you wanted to find out whether an integer contained an even number of 1 bits, which status flag would be useful? a. carry b. overflow c. sign d. parity 27. In regard to multitasking, a task's state consists of which three elements? a. status flags, program counter, register contents b. register contents, task variables, program counter c. task variables, segment descriptor, register contents d. segment descriptor, status flags, task variables 28. Within the CPU, all calculations and logic operations take place inside the ___________ . a. registers b. ALU c. CU d. MBU 29. The three types of buses connected to the CPU are: a. data, address, control b. data, system, address

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c. address, control, memory d. fetch-decode, control, execution 30. If a clock oscillates 10 billion times per second, what is the duration of a single clock cycle? a. 1 nanosecond b. 1.0 x 10-9 seconds c. 1.0 x 1010 seconds d. 1.0 x 10-10 seconds 31. During which phase of the instruction execution cycle is the program counter incremented? a. decode b. execute c. operand fetch d. fetch 32. The four parts of a CPU are: a. data bus, memory unit, control unit, arithmetic logic unit b. address bus, registers, control unit, arithmetic logic unit c. clock, memory unit, control unit, instruction fetch unit d. clock, registers, control unit, arithmetic logic unit 33. What is the name of the time delay in a CPU caused by differences between the speed of the CPU, the system bus, and memory circuits? a. wait cycle b. wait state c. dead cycle d. memory write cycle 34. List the three primary steps of the instruction execution cycle, in sequential order. a. fetch, decode, memory write b. fetch, memory read, execute c. decode, fetch, execute d. fetch, decode, execute 35. Which stage in the X86 instruction cycle is responsible for translating logical addresses to linear addresses and performing protection checks? a segment unit b. code prefetch unit c. execution unit d. paging unit 36. What are the six stages, or units involved in executing a single X86 instruction? a. code prefetch, instruction decode, execution, segment, paging, memory store

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b. bus interface, instruction decode, parallel analysis, execution, segment, paging c. bus interface, code prefetch, instruction decode, execution, segment, paging d. bus interface, code prefetch, instruction decode, execution, address translation, paging 37. Which flag is set when an unsigned value is too large to fit into a destination operand? a. Sign b. Carry c. Overflow d. Auxiliary Carry 38. Which of the following correctly describes the sequence of reading from memory during a single clock cycle? a.

Read line set low; Address placed on bus; Operand placed on data bus by memory controller; Read line set high, indicating that data bus contains the requested data.

b.

Address placed on bus; Operand placed on data bus by memory controller; Read line set low; Read line set high, indicating that data bus contains the requested data.

c.

Address placed on bus; Read line set low; Read line set high, indicating that data bus contains the requested data; Operand placed on data bus by memory controller.

d.

Address placed on bus; Read line set low; Operand placed on data bus by memory controller; Read line set high, indicating that data bus contains the requested data.

39. Which register is known as a loop counter? a. EAX b. EBX c. ECX d. EDX 40. Which mode is the native state of the Intel processor? a. Protected mode b. Virtual-8086 mode c. Real-address mode d. System management mode 41. Real-address mode combines which two values to form addresses? a. page, segment b. segment, offset c. descriptor, segment d. offset, descriptor 42. When the CPU tries to execute part of a program that has been swapped out to disk, it executes a a. descriptor table load b. general protection fault c. page fault

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d. page translation 43. Which type of device receives a digital bit stream directly from the video controller? a. CRT Display b. Liquid Crystal Display c. none of the above 44. Which type of RAM is typically used for cache memory? a. static RAM b. dynamic RAM c. CMOS RAM d. Video RAM (Some of the following questions have more than one correct answer. Circle all correct answers.)

45. Which of the following describe(s) RISC processors? a. short, simple instructions, executed quickly b. complex high-level instructions c. requires microcode interpreter d. instructions are executed directly by hardware 46. Which of the following is(are) advantages of USB ports over parallel ports? a. bidirectional data transfer b. query devices to get name and type of device c. permits a hub to be connected d. can suspend power to devices 47. Which type of output is the most general and portable to different computer systems? a. writing directly to video memory b. using C++ stream output statements c. calling operating system functions d. calling BIOS functions 48. Which type of output will execute the most quickly? a. writing directly to video memory b. using C++ stream output statements c. calling operating system functions d. calling BIOS functions

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Chapter 3 Test Bank Note to instructors: To view the answers, select Tools | Options | View | Hidden Text in MS-Word.

Fill in the Blanks and Short Answer 1.

Show an example of a valid hexadecimal integer constant.

2.

Show an example of a valid 8-bit binary integer constant.

3.

Show an example of an integer expression that performs both multiplication and modulus arithmetic.

4.

What is the order of operations in the expression −6 + 25 * 4 ?

5.

A command that is recognized and executed by the assembler while the source code is being assembled is a(n) __________.

6.

A _________ is a word that has special meaning to the assembler and can only be used in its correct context.

7.

Identify two types of labels in assembly language programs.

8.

Show an example of an instruction mnemonic.

9.

Which directive enables block-style comments?

10. In the AddSub program in Section 3.2, which statement displays the contents of the registers?

11. In the AddSub program in Section 3.2, which directive marks the last line in the program?

12. In the AddSub program in Section 3.2, which directive copies necessary definitions and setup information from a text file?

13. Which directive is used when defining signed 16-bit integers?

14. Which directive is used when defining unsigned 16-bit integers?

15. Which directive is used when defining unsigned 16-bit integers?

16. Which directive is used when defining 80-bit integers?

17. Which directive can by used in place of the BYTE directive for unsigned integers?

18. Write a data definition statement that creates a signed 16-bit integer named myWord and leaves its contents uninitialized.

19. Which directive defines a segment containing only uninitialized data?

20. Declare a symbolic constant named COUNT that equals 25.

25)

COUNT = 25 (or COUNT EQU

21. Use COUNT from the previous question in a data definition statement that creates an uninitialized array of 32-bit unsigned integers named myArray.

22. Given the following array definition, write a constant declaration named ArraySize that automatically calculates the size in bytes, of the array:

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newArray DWORD 10,20,30,40,50

Multiple-Choice 23. Which directive identifies the part of a program containing instructions? a. .DATA b. .CODE c. .STACK d. .PROG 24. Which directive(s) are used when defining both signed and unsigned 64-bit integers? a. QWORD and SQWORD b. DWORD c. QWORD d. DWORD and SDWORD 25. In the AddSub program in Section 3.2, the exit statement calls which predefined MS-Windows function to halt the program? a. HaltProgram b. ExitProcess c. OS_Return d. Exit_Program 26. Which of the following are valid data definition statements that create an array of unsigned bytes containing decimal 10, 20, and 30, named myArray. a. myArray BYTE 10, 20, 30 b. BYTE myArray 10, 20, 30 c. BYTE myArray[3]: 10, 20,30 d. myArray BYTE DUP (3) 10,20,30 27. In the following data definition, assume that List2 begins at offset 2000h. What is the offset of the third value (5)?

List2 WORD 3,4,5,6,7 a. 20008h b. 2002h c. 2000h d. 2004h 28. Which letter choice shows the memory byte order, from low to high address, of the following data definition?

BigVal DWORD 12345678h

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a. 56h, 78h,12h,34h b. 12h,34h,56h,78h c. 78h,56h,34h,12h d. 34h,12h,78h,56h 29. Given the following array definition, which letter choice contains a valid constant declaration named ArrayCount that automatically calculates the number of elements in the array? newArray DWORD 10,20,30,40,50 a. ArrayCount = newArray − $ b. ArrayCount = ($ − newArray) / 4 c. ArrayCount DWORD $ − newArray d. ArrayCount = (newArray − $)  4 30. Select a data definition statement that creates an array of 500 signed doublewords named myList and initializes each array element to the value −1. a. SDWORD myList 500 DUP (−1) b. myList 500 SDWORD DUP (−1) c. myList 500 SDWORD (−1) d. myList SDWORD 500 DUP (−1) 31. Which of the following defines a text macro named MESSAGE that contains this string data?

"I'm good at this!",0 a. MESSAGE TEXTEQU <"I'm good at this!",0> b. TEXTEQU MESSAGE <"I'm good at this!",0> c. <"I'm good at this!",0> TEXTEQU MESSAGE d. TEXTEQU <"I'm good at this!",0> MESSAGE 32. Which directive is used when defining 64-bit IEEE long reals? a. REAL4 b. REAL8 c. REAL64 d. REAL 33. An identifier may begin with a digit. a. True b. False 34. The listing file contains a list of program symbols. a. True b. False 35. The following is a valid identifier: AB62−$ T

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a. True b. False 36. The following is a valid data definition statement: str1 \ BYTE "This string is quite long!",0 a. True b. False 37. The following are both valid data definition statements: List1 BYTE 10,20 BYTE 30,40 a. True b. False 38. The following sequence of statements is invalid: .code mov eax,edx .data myByte BYTE 10 .code mov al,myByte a. True b. False 39. The EQU directive permits a constant to be redefined at any point in a program. a. True b. False

(Some of the following questions have more than one correct answer. Circle all correct answers.)

40. The two types of real-number constants are: a. decimal, binary b. encoded, binary c. decimal, encoded d. BCD, ASCII

41. Which of the following are true about assembly language instructions and directives? a. a directive is executed at runtime b. an instruction is executed at runtime c. a directive is executed at assembly time

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d. an instruction is executed at assembly time

42. The basic parts of an instruction, in order from left to right, are: a. label, mnemonic, operand(s), comment b. comment, label, mnemonic, operand(s) c. label, mnemonic, comment d. mnemonic, operand(s), comment

43. Operands may be any of the following: a. constant or constant expression b. reserved word c. register name d. variable name (memory)

44. Which utility program reads an assembly language source file and produces an object file? a. compiler b. linker c. assembler d. loader

45. A map file is produced by which of the following utility programs? a. assembler b. linker c. loader d. text editor

46. Which file(s) contain a human-readable listing of segment (and segment group) names? a. listing b. source c. map d. executable

47. Which of the following will generate assembly errors? a. var1 BYTE 1101b, 22, 35 b. var2 BYTE "ABCDE",18 c. var3 BYTE '$','98778',

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d. var4 BYTE 256,19,40

48. The byte-ordering scheme used by computers to store large integers in memory with the highorder byte at the lowest address is called: a. big endian b. byte-major c. little endian d. byte-minor

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Chapter 4 Test Bank Note to instructors: To view the answers, select Tools | Options | View | Hidden Text in MS-Word.

Fill in the Blanks and Short Answer Use the following data definitions until notified otherwise: byte1 BYTE 0FFh,1,2 byte2 BYTE 14h word1 WORD 0FFFFh,1,2 word2 WORD 3 word3 SWORD 7FFFh,8000h word4 SWORD 9000h dword1 DWORD 10h,20h,30h,40h dArray DWORD 10 DUP(?)

1.

Write one or more statements that move the contents of word1 to word2.

2.

For each of the following instructions, indicate whether it is valid (V) or invalid (I): a. mov byte2,0FFh b. mov word1,byte2 c. mov word2,10000h d. mov si,word1

3.

For each of the following instructions, indicate whether it is valid (V) or invalid (I): a. movzx ax,byte1 b. movzx edx,bl c. movzx word2,al d. movsx dl,al

4.

Indicate the hexadecimal value of the destination operand next to each instruction. Use the letter I to indicate that a particular instruction is illegal: mov dx,word3 movsx eax,byte1 mov dh,al mov bx,dx

5.

a. b. c. d.

Indicate the hexadecimal value of the destination operand next to each instruction. Use the letter I to indicate that a particular instruction is invalid: mov ax,[word3+2] b. mov al,[byte1+1] mov eax,[word3+4]

6.

c. d.

Where marked by a letter (a, b, c, d), indicate the hexadecimal value of the destination operand: mov ax,word1 inc ax dec ax mov ax,word3 neg ax add ax,0C2A5h

7.

a. mov eax,[dword1+4]

a. b. c. d.

Where marked by a letter (a, b, c, d), indicate the hexadecimal value of the destination operand:

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mov al,7Fh add al,2 sub al,5 mov al,80h add al,80h neg al

a: ZF,CF,SF,OF= b: ZF,CF,SF,OF= c: ZF,CF,SF,OF= d: ZF,CF,SF,OF=

8.

Which instruction loads the low byte of the EFLAGS register into AH?

9.

Write an instruction that moves the 32-bit address of word1 into the ESI register (assume 32-bit Protected mode).

10. Write an instruction that moves the lower 16 bits of dword1 into the BX register (hint: use PTR).

11. Write an instruction that moves the lower 8 bits of word2 into the AL register.

12. Write an instruction that moves EBX to location word1: 13. What is the value of the expression (TYPE word1)?

14. What is the value of the expression (TYPE dword1)?

15. What is the value of the expression (LENGTHOF word1)?

16. What is the value of the expression (SIZEOF word1)?

Short Programming Problems Use the following data definitions until notified otherwise: byte1 BYTE 0FFh,1,2 byte2 BYTE 14h word1 WORD 0FFFFh,1,2 word2 WORD 3 word3 SWORD 7FFFh,8000h word4 SWORD 9000h dword1 DWORD 10h,20h,30h,40h dArray DWORD 10 DUP(?)

17. Implement the following expression in assembly language, using 32-bit integers (you may modify any registers you wish): eax = dword1 + ebx - ecx 18. Implement the following expression in assembly language, using 32-bit integers (you may modify any registers you wish): eax = -dword1 + (edx - ecx) + 1 19. Implement the following expression in assembly language, using 32-bit integers. The notation dword[1] corresponds to an array reference in C++ or Java: dArray[0] = dArray[1] + dArray[2] 20. Use the following data declarations to write an assembly language loop that copies the string from source to target. Use indexed addresing with EDI, and use the LOOP instruction. source target

BYTE BYTE

"String to be copied",0 SIZEOF source DUP(0),0

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Multiple-Choice 21. The MOV instruction does not permit an immediate value to be moved to a segment register. a. true b. false 22. The MOVSX instruction sign-extends an integer into a larger operand. a. true b. false 23. The DS register can be the destination operand of a MOV instruction. a. true b. false 24. The ES register can the source operand of a MOV instruction. a. true b. false 25. The SAHF instruction copies the EFLAGS register into a 32-bit memory location. a. true b. false 26. The INC instruction does not affect the Carry flag. a. true b. false 27. Adding 7Fh and 05h in an 8-bit register sets the Overflow flag. a. true b. false 28. Adding 0FFh and 05h in an 8-bit register sets the Overflow flag. a. true b. false 29. Adding 5 to 0FBh in an 8-bit register sets the Zero flag. a. true b. false 30. The following instructions will set the Carry flag: mov al,0FEh sub al,2 a. true b. false 31. The following instructions will set the Sign flag: mov al,0FEh sub al,2 a. true b. false

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32. Select the answer choice that best implements the following expression. Do not permit dword1, ECX, or EDX to be modified: eax = -dword1 + (edx - ecx) + 1 a.

b.

c.

d.

mov eax,dword1 neg eax sub edx,ecx add eax,edx inc eax mov eax,dword1 neg eax mov ebx,edx sub ebx,ecx add eax,ebx inc eax neg dword1 mov ebx,edx sub ebx,ecx add eax,ebx inc eax mov eax,dword1 mov edx,ebx sub ebx,ecx add eax,ebx inc eax

Some of the following questions have more than one correct answer. Circle all correct answers:

Use the following data definitions until notified otherwise: byte1 BYTE 0FFh,1,2 byte2 BYTE 14h word1 WORD 0FFFFh,1,2 word2 WORD 3 word3 SWORD 7FFFh,8000h word4 SWORD 9000h dword1 DWORD 10h,20h,30h,40h dArray DWORD 10 DUP(?)

33. What is the hexadecimal value of AX when this code executes? mov esi,OFFSET word1 add esi,4 mov ax,[esi] a. 1 b. 2 c. FFFFh d. 3

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34. What is the final hexadecimal value of AX when this code executes? mov ebx,OFFSET dword1 sub ebx,2 mov ax,[ebx] a. 0000h b. 0010h c. 9000h d. 0020h 35. What is the final hexadecimal value of AL when this code executes? mov ebx,OFFSET byte1 mov al,[ebx+3] a. 1 b. 2 c. 14h d. 3 36. What is the final hexadecimal value of EAX when this code executes? mov edx,8 mov eax,dword1[edx] a. 00000010h b. 20000000h c. 00300000h d. 00000030h 37. In Protected mode, which of the following define(s) a pointer variable containing the offset of word1? a. ptr1 DWORD word1 b. word1 DWORD ptr1 c. ptr2 DWORD PTR word1 d. ptr2 DWORD OFFSET word1 38. Suppose the statement PWORD TYPEDEF PTR DWORD has already appeared in a program.

Which of the following data declarations would be correct? a. PTR DWORD var1 ? b. var2 PWORD ? c. var3 PTR DWORD ? d. var4 PTR PWORD ?

Example 2 1: 2: 3: 4:

.data varX DWORD 9,8,7,6,5,4,3,2,1,0 varY DWORD (LENGTHOF varX) DUP(0) .code

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5: 6: 7: 8: 9: 10: 11: 12:

mov esi,OFFSET varY + (SIZEOF varX) - 4 mov edi,4 mov ecx,LENGTHOF varX - 1 L1: mov eax,varX[edi] mov [esi],eax add edi,4 sub esi,4 loop L1

39. Refer to Example 2. After the loop executes, what will be the values at locations varY, varY+4, and varY+8? a. 0, 0, 0 b. 0, 1, 2 c. 1, 2, 3 d. 0, 0, 1 40. Refer to Example 2. After the loop executes, what will be the values in the last three positions (array elements) of varY? a. 0, 0, 0 b. 8, 9, 0 c. 6, 7, 8 d. 7, 8, 9 41. Refer to Example 2. If line 9 were changed to the following, what would be the final values at locations varY, varY+4, and varY+8?

9:

mov [esi-4],eax

a. 0, 0, 0 b. 0, 1, 2 c. 1, 2, 3 d. 0, 0, 1

Use the following data for the remaining questions in this section: word1 WORD 1000h,2000h,3000h,4000h,5000h dword1 DWORD 10000h,20000h,30000h,40000h 42. What is the final value of AX after this code has executed? mov esi,OFFSET word1 mov ecx,5 mov eax,100h L1: add ax,[esi] add ax,16 add esi,TYPE word1 Loop L1 a. F150h b. 0150h c. F016h

Irvine, Kip R. Assembly Language for Intel-Based Computers, 4th Edition

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d. 0016h 43. What is the final value of AX after this code has executed? mov edx,OFFSET word1+8 mov ecx,2 mov ax,0 L1: mov ax,[edx] add ax,20h sub edx,4 Loop L1 a. 8040h b. 9040h c. 4020h d. 3020h 44. Suppose we want EAX to contain the sum of the dword1 array when the following (incomplete) code finishes executing: 1: 2: 3: 4: 5: 6:

mov edi,OFFSET dword1 mov ecx,LENGTHOF dword1 ? ? ? loop L1

Which of the following choices would best fill in lines 3, 4, and 5? a.

b.

c.

d.

3: 4: 5:

mov L1: add add

eax,[edi] eax,dword1 edi,2

3: 4: 5:

mov L1: add add

eax,0 eax,[edi] edi,TYPE dword1

3: 4: 5:

mov L1: add add

eax,0 eax,[edi] edi,2

3: 4: 5:

mov L1: add add

DWORD PTR [edi],0 eax,[edi] edi,TYPE dword1

Irvine, Kip R. Assembly Language for Intel-Based Computers, 4th Edition

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Chapter 5 Test Bank Note to instructors: To view the answers, select Tools | Options | View | Hidden Text in MS-Word.

True/False 1.

A link library contains procedures that have already been assembled into object code.

2.

The PROTO directive is required when calling a library procedure.

3.

The assembler knows the exact address of a library procedure.

4.

The linker combines object files into an executable file.

5.

Real-mode programs should link to Irvine16.lib.

Fill in the Blanks and Short Answer 6.

Which file acts as a bridge between Irvine32.lib and kernel32.dll?

7.

Which I/O device is used for standard input?

8.

Which library procedure writes a single character to standard output?

9.

Which library procedure locates the cursor at a specific row and column on the screen?

10. Which library procedure reads a 32-bit signed decimal integer from standard input?

11. Which library procedure displays the CPU flags and 32-bit registers?

12. Which library procedure generates a 32-bit pseudorandom integer in a caller-specified range?

13. Which library procedure writes an unsigned 32-bit integer to standard output in hexadecimal format?

14. Which library procedure reads a string from standard input?

15. Which register contains the offset of a character array when calling GetCommandTail?

16. Which register contains an integer before calling WriteDec? 17. Which register contains the starting address of data when calling DumpMem? 18. Write code that causes a 500 millisecond delay, using a library procedure.

19. Write a statement that moves a video color constant to EAX. The constant should represent black text on a white background, using the constants described in the Irvine32.inc file.

20. What will be the value of EAX when the following sequence of instructions has executed? push 5 push 10 push 20 pop eax 21. What will be the value of EAX when the following sequence of instructions has executed? push 5 push 10 pop ebx pop eax 22. What will be the value of ECX when the following sequence of instructions has executed? push 5 push 10 pop ebx

Irvine, Kip R. Assembly Language for Intel-Based Computers, 4th Edition

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pop eax pop ecx

Short Programming Problems 23. Write a sequence of statements that read a signed integer from standard input and write the same integer to standard output. Use library procedures.

24. Given the following string definition, write a sequence of statements that write the string to standard output. Use a library procedure. str1 BYTE "Display this string",0 25. Given the following data definition, write a sequence of statements that display a dump of the data in 32-bit hexadecimal, using the DumpMem procedure from the link library. array DWORD 10h,20h,30h,40h 26. Write statements that use library procedures to generate a single unsigned pseudorandom integer between 0 and 999 and write it to standard output: 27. Write a procedure named ShowBinary that displays the following array as a sequence of binary bits, starting with the low-order value (00000010h). Include the use of the LENGTHOF, OFFSET, and TYPE operators, and call the WriteBin procedure. array DWORD 10h,20h,30h,40h 28. Write a procedure named Read10 that reads exactly ten characters from standard input into an array of BYTE named myString. Use the LOOP instruction with indirect addressing, and call the ReadChar procedure from the book's link library. (ReadChar returns its value in AL.) 29. Code a PROC declaration for a procedure named MySub. Use the USES operator to preserve the EAX and EBX registers.

30. Draw a flowchart that corresponds to the following code: mov ecx,LENGTHOF array mov eax,0 mov esi,OFFSET array L1: add eax,[esi] add esi,TYPE array loop L1 mov sum,eax

Multiple-Choice (Some of the following questions have more than one correct answer. Circle all correct answers.)

31. Which of the following CALL instructions writes the contents of EAX to standard output as a signed decimal integer? a. call WriteInteger b. call WriteDec c. call WriteHex d. call WriteInt 32. Which of the following code sequences assigns the value 10h to EBX? a.

mov

edx,20h

Irvine, Kip R. Assembly Language for Intel-Based Computers, 4th Edition

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push edx mov ecx,10h push ecx pop ebx pop edx b.

c.

d.

mov ecx,10h mov edx,20h push ecx push edx pop ebx pop edx push 20h mov ecx,10h push ecx pop eax pop ebx push 30h push 10h push 20h pop edx pop ebx pop eax

33. The process of dividing a problem into general tasks, and then separating general tasks into more specific tasks is called . . . a. process-oriented design b. functional decomposition c. top-down design d. object-oriented design 34. Which of the following are valid design criteria for the Integer Summation Program (Section 5.6)? a. separate procedures make the program run faster b. separate procedures make the program's structure easier to understand c. LOOP instructions might be out of range if all code were placed in the main procedure d. the program is easier to maintain and understand when all the code is in a single procedure 35. Which of the following are true about the PUSH instruction? a. It decrements the stack pointer (by 2 or 4) and copies the operand into the stack at the location pointed to by the stack pointer. b. It copies the operand into the stack at the location pointed to by the stack pointer, and then decrements the stack pointer (by 2 or 4). c. It increments the stack pointer (by 2 or 4) and copies the operand into the stack at the location pointed to by the stack pointer. d. It increments the stack pointer by 1 and copies the operand into the stack at the location pointed to by the stack pointer.

Irvine, Kip R. Assembly Language for Intel-Based Computers, 4th Edition

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Chapter 6 Test Bank Note to instructors: To view the answers, select Tools | Options | View | Hidden Text in MS-Word.

True/False 1.

A WHILE loop can be constructed with a CMP instruction at the bottom of the loop, followed by a conditional jump instruction.

2.

In a finite-state machine, transitions between states usually occur when a new value has been read from input.

3.

The following finite-state machine could be used to successfully validate the string "234+": digit

C digit start

A

+,-

digit

B

Fill in the Blanks and Short Answer 4.

In the following instruction sequence, show the changed values of AL where indicated, in binary: mov al,11001111b and al,00101011b mov al,4Bh and al,6Ch mov al,00111100b or al,82h mov al,94h xor al,37h

5.

; b. ; c. ; d.

In the following instruction sequence, show the changed values of AL where indicated, in hexadecimal: mov al,9Ch not al mov al,4Bh and al,74h mov al,86h or al,42h mov al,72h xor al,0A5h

6.

; a.

; a. ; b. ; c. ; d.

In the following instruction sequence, show the values of the Carry, Zero, and Sign flags where indicated: mov al,00110011b test al,2 mov al,6 cmp al,5 mov al,5 cmp al,7

; a. CF=

ZF=

SF=

; b. CF=

ZF=

SF=

; c. CF=

ZF=

SF=

Irvine, Kip R. Assembly Language for Intel-Based Computers, 4th Edition

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7.

Code a single instruction that clears bits 0, 3, and 4 in the AL register.

8.

Code instructions that jump to the label L1 when either bit 2 or 3 is set in the DL register (do not modify DL).

9.

Code instructions that jump to the label L2 when the signed integer in BL is greater than −5.

10. Code a single instruction that complements all bits in AL, without using the XOR instruction.

11. Code instructions that jump to label L3 when the AX register has even parity.

12. Code a single instruction that inverts bits 5 and 6 in BL without changing any other bits.

13. Code instructions that jump to label L4 if bits 1, 2, and 3 are all set in the DL register.

14. Code a label named Here that can be the target of a jump instruction originating in a different procedure.

15. Code instructions that jump to label L5 when the BL register has odd parity. Do not alter the value in BL. 16. Code instructions that set the Overflow flag. Then code a jump instruction that jumps to label L6 when the Overflow flag has been set.

17. Code instructions that implement the following pseudocode using conditional jump instructions.

Do not use the .IF directive. Assume that integers are unsigned: if( eax > ebx ) mov dl,5; else mov dl,6;

Multiple-Choice 18. What will be the hexadecimal value of AL after these instructions execute? mov al,0CFh and al,2Bh a. 0Bh b. EAh c. 06h d. none of the above 19. What will be the hexadecimal value of AL after these instructions execute? mov al,3Ch or al,82h a. 3Eh b. BCh c. BEh d. none of the above 20. What will be the hexadecimal value of AL after these instructions execute? mov al,94h xor al,37h a. B7h

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b. A3h c. 3Fh d. none of the above 21. Which answer choice shows the correct values of the Carry, Zero, and Sign flags after the following instructions execute? mov al,00110011b test al,2 a. CF = 1, ZF = 0, SF = 1 b. CF = 0, ZF = 1, SF = 0 c. CF = 1, ZF = 0, SF = 1 d. CF = 0, ZF = 0, SF = 0 22. Which answer choice shows the correct values of the Carry, Zero, and Sign flags after the following instructions execute? mov al,6 cmp al,5 a. CF = 0, ZF = 0, SF = 0 b. CF = 1, ZF = 0, SF = 0 c. CF = 1, ZF = 1, SF = 0 d. CF = 1, ZF = 0, SF = 1 23. Which of the following selections contain instructions that jump to label L4 if bits 1, 2, and 3 are all set in the DL register? a.

b.

c.

and dl,0Eh test dl,0Eh jnz L4 test dl,0Eh jnz L4 and dl,07h cmp dl,07h je L4

d. and dl,0Eh cmp dl,0Eh je L4 24. Which choices contain correct implementations of the following pseudocode? (Assume that all values are unsigned): if( eax > ebx ) mov dl,5; else mov dl,6; a.

Irvine, Kip R. Assembly Language for Intel-Based Computers, 4th Edition

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cmp eax,ebx ja L1 mov dl,6 jmp L2 L1: mov dl,5 L2: b.

cmp eax,ebx ja L1 mov dl,5 jmp L2 L1: mov dl,6 L2:

c. cmp eax,ebx jbe L2 mov dl,5 jmp L2 L1: mov dl,6 L2: d.

cmp eax,ebx jna L1 mov dl,5 jmp L2 L1: mov dl,6 L2:

Use the following data for the next two questions. All values are signed: .data val1 SDWORD ? val2 SDWORD ?

25. Which selection is the correct implementation of the following pseudocode? if( val1 > val2 || val2 > eax ) mov ebx,1; else mov ebx,2; a.

b.

mov val1,ebx cmp ebx,val2 jng L1 cmp val2,eax jg L1 mov ebx,2 jmp L2 L1: mov ebx,1 L2: mov val1,ebx cmp ebx,val2

Irvine, Kip R. Assembly Language for Intel-Based Computers, 4th Edition

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jg L1 cmp val2,eax jg L1 mov ebx,2 jmp L2 L1: mov ebx,1 L2: c.

d.

mov val1,ebx cmp val2,ebx jg L1 cmp val2,eax jg L2 mov ebx,2 jmp L2 L1: mov ebx,1 L2: mov val1,ebx cmp ebx,val2 jle L1 cmp val2,eax jle L1 mov ebx,1 jmp L2 L1: mov ebx,2 L2:

26. Which selection correctly implements the following pseudocode? while( int2 >= int1 ) { add ebx,2 if( ebx > int2) mov ebx,0 else mov ebx,int1 } a.

top: mov eax,int2 cmp eax,int1 jnge L3 add ebx,2 cmp ebx,int2 jg L2 mov ebx,int1 jmp L3 L1: mov ebx,0 L2: jmp top L3:

b.

top: mov eax,int1 cmp eax,int2

Irvine, Kip R. Assembly Language for Intel-Based Computers, 4th Edition

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jl L3 add ebx,2 cmp ebx,int2 jg L1 mov ebx,int1 jmp L2 L1: mov ebx,0 L2: jmp top L3: c.

top: mov eax,int2 cmp eax,int1 jl L3 add ebx,2 cmp ebx,int2 jg L1 mov ebx,int1 jmp L2 L1: mov ebx,0 L2: jmp top L3:

d.

top: mov eax,int2 cmp eax,int1 jl L3 add ebx,2 cmp ebx,int2 jg L1 mov ebx,0 jmp L2 L1: mov ebx,int1 L2: jmp top L3:

27. Suppose EAX, EBX, and ECX contained three unsigned integers. Which of the following code excerpts would display the largest of the three integers? a.

b.

cmp eax,ebx jb L1 mov eax,ebx L1: cmp eax,ecx jb L2 mov eax,ecx L2: call WriteInt cmp eax,ebx jae L1 mov eax,ebx L1: cmp eax,ecx jae L2 mov eax,ecx L2: call WriteInt

Irvine, Kip R. Assembly Language for Intel-Based Computers, 4th Edition

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c.

d.

cmp eax,ebx jnae L1 mov eax,ebx L1: cmp ecx,eax jnae L2 mov eax,ecx L2: call WriteInt cmp eax,ecx jae L1 mov eax,ebx L1: cmp eax,ebx jae L2 mov eax,ecx L2: call WriteInt

28. What will be the final value of ESI when the following code executes? .data array SWORD 8,2,3,5,-4,6,0,4 .code mov esi,0 mov ecx,LENGTHOF array L1: mov ax,array[esi] cmp ax,0 pushf add esi,TYPE array popf Loopne L1 a. 00000006h b. 00000007h c. 0000000Ch d. 0000000Eh 29. What will be the final values of CX and DX when the following code executes? .data array SWORD 8,2,3,5,-4,6,0,4 .code mov cx,1 mov esi,2 mov ax,array[esi] mov bx,array[esi+4] cmp ax,3 jae L2 cmp bx,4 jb L1 jmp L3 L1: mov cx,4 L2: mov dx,5 jmp L4 L3: mov dx,6 L4:

Irvine, Kip R. Assembly Language for Intel-Based Computers, 4th Edition

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a. CX = 4, DX = 5 b. CX = 1, DX = 6 c. CX = 1, DX = 5 d. CX = 4, DX = 6 30. In Protected mode (flat model), which of the following CALL instructions executes an indirect call to a procedure whose address is stored in a memory location pointed to by EBX? a. call [ebx] b. call DWORD PTR [ebx] c. call FAR [ebx] d. call NEAR PTR [ebx]

Irvine, Kip R. Assembly Language for Intel-Based Computers, 4th Edition

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Chapter 7 Test Bank Note to instructors: To view the answers, select Tools | Options | View | Hidden Text in MS-Word.

Fill in the Blanks and Short Answer 1.

What is the binary value of AL after the following instructions have executed? mov al,10000101b clc rcr al,1

2.

What is the binary value of AL after the following instructions have executed? mov al,01101011b stc rcl al,2

3.

What is the binary value of AX after the following instructions have executed? mov ax,0000000010011101b mov bx,1010101010000000b shld ax,bx,1

4.

What is the binary value of AX after the following instructions have executed? mov ax,0000000010011101b mov bx,1010101010001011b shrd ax,bx,2

5.

What will be the value of the Overflow flag after the following instructions have executed? mov dx,800h mov ax,10h imul dx

6.

What will be the hexadecimal values of DX and AX after the following instructions have executed? mov dx,-16 mov ax,2 imul dx

7.

What will be the hexadecimal values of DX and AX after the following instructions have executed? mov dx,000Fh mov ax,6342h mov bx,100h div bx

Short Programming Problems 8.

Write a series of instructions that will multiply EAX by 18, using a combination of shift, MOV, and ADD instructions.

9.

Write a sequence of two instructions that copies the integer in bits 4-7 from the AL register into bits 0-3 of the BL register. The upper 4 bits of AL will be cleared, as will the upper 4 bits of BL.

Irvine, Kip R. Assembly Language for Intel-Based Computers, 4th Edition

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10. Write a sequence of two instructions that copies bits 0-5 from AL to bits 0-5 in BL. Bits 6-7 in BL should be cleared, and AL should be unchanged.

11. Write a sequence of instructions that divide −16 by 5, using the IDIV instruction. Use the EBX register as the divisor.

Multiple-Choice (Some of the following questions have more than one correct answer. Circle all correct answers.)

12. Suppose we want to copy the value of the Carry flag into bit 7 of AL, and shift all existing bits in AL one position to the right. Which of the following instructions will work? a. shr al,1 b. sar al,1 c. ror al,1 d. rcr al,1 13. Suppose we want to convert the value 6Fh in AL to the value F6h. Which of the following instructions will do this? a. ror al,3 b. rol al,4 c. ror al,4 d. rcr al,4 14. Which of the following instructions will divide the unsigned integer in EBX by 8? a. shr ebx,8 b. shr ebx,3 c. sar ebx,8 d. shl ebx,3 15. Which of the following instructions will multiply the integer in EBX by 32? a. shr ebx,5 b. rol ebx,32 c. shl ebx,5 d. ror ebx,32 16. What will be the hexadecimal values of DX and AX after the following instructions have executed? mov ax,6B49h mov dx,0095h shl ax,1 rcl dx,1 a. DX = 0148h, AX = C691h b. DX = 012Ah, AX = C9A2h c. DX = 012Ah, AX = D692h d. DX = 024Bh, AX = D692h

Irvine, Kip R. Assembly Language for Intel-Based Computers, 4th Edition

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17. Given the following two assignments to AX and DX, which block of instructions will cause DX to equal 4025h and AX to equal 1AD2h? mov ax,6B49h mov dx,0095h a.

b.

c.

d.

shr ax,1 rcr dx,1 shr ax,1 rcr dx,1 shr ax,2 rcr dx,1 shl ax,1 shl ax,2 shr dx,1 rcl dx,1 shr ax,1 rcl dx,2 rcr ax,1 shl dx,1

18. Which of the following blocks of instructions will multiply the contents of the EDX register by 36? a.

b.

c.

d.

mov ebx,edx shl edx,5 shl ebx,2 add ebx,edx mov ebx,edx shl edx,5 shl ebx,2 add edx,ebx mov ebx,4 add edx,ebx shl edx,2 shl ebx,5 add edx,ebx mov ebx,edx shl ebx,5 shl edx,2 add edx,ebx

19. Given that EAX contains FFFF80C0h, which of the following would be true after executing the CWD instruction? a. AX=FFFFh, DX=80C0h b. EDX=FFFFFFFFh, EAX=FFFF80C0h

Irvine, Kip R. Assembly Language for Intel-Based Computers, 4th Edition

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c. DX=FFFFh, AX=80C0h d. cannot be determined 20. What will be the hexadecimal values of DX and AX after the following instructions have executed? mov ax,3456h mov dx,12h mov bx,10h div bx a. DX=0006h, AX=2345h b. DX=1234h, AX=0056h c. DX=0056h, AX=1234h d. cannot be determined

Irvine, Kip R. Assembly Language for Intel-Based Computers, 4th Edition

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Chapter 8 Test Bank Note to instructors: To view the answers, select Tools | Options | View | Hidden Text in MS-Word.

Short Programming Problems 1.

Write a procedure named UseThree that has three unsigned integer stack parameters: a byte, a word, and a doubleword.

2.

Add a local variable named var1 of type DWORD to the UseThree procedure from the previous question.

3.

Show the entry code generated by the assembler for the UseThree procedure (in the previous question).

4.

Suppose we define the following procedure: Example2 PROC, one:DWORD, two:DWORD mov eax,one mov ebx,[ebp+12] call DumpRegs ret Example2 ENDP If we called Example2 using the following statement, what values would be displayed in EAX and EBX? INVOKE Example2, 10h, 20h

5.

Suppose we were to call a procedure named ProcOne, passing it two value parameters. The procedure adds the two parameters and returns their sum in EAX: push 5 push 10 call ProcOne

; EAX = sum

Create the implementation of ProcOne, using explicit stack parameters (such as [ebp+n]). Follow other common conventions regarding the saving and restoring of registers. Restore the stack pointer using the STDCALL calling convention, and assume a 32-bit memory model.

6.

Suppose we were to call a procedure named ProcTwo, which calculates the sum of the elements of an array of 16-bit words and returns the sum in EAX. The following code calls ProcTwo: .data myArray WORD 100h,200h,300h .code push LENGTHOF myArray push OFFSET myArray call ProcTwo ; EAX = sum Write the implementation of ProcTwo, using explicit stack parameters (such as [ebp+n]). Follow other common conventions regarding the saving and restoring of registers. Restore the stack pointer using the PASCAL calling convention, and assume a 32-bit memory model.

7.

Write a series of statements that would typically be found inside a procedure. Do the following: create space for a single doubleword local variable on the stack, and assign a random 32-bit integer to the variable.

8.

Write a statment

Irvine, Kip R. Assembly Language for Intel-Based Computers, 4th Edition

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Multiple-Choice (Some of the following questions have more than one correct answer. Circle all correct answers.)

9.

Which of the following are true regarding local variables? a. They make efficient use of memory because their storage space can be released. b. They can be accessed from anywhere inside the same source code module. c. They are usually created in the data segment d. The same variable name can appear in two different procedures

10. How are static variables distinguished from global variables? a. Global variables are visible from all procedures in the source code file. b. Static variables have a shorter lifetime than global variables. c. The lifetime of a static variable is the same as the lifetime of its program. d. Static variables are created on the stack, using the ESP and EBP registers.

11. Which of the following shows the procedure entry code generated by MASM when the LOCAL directive is used to declare a doubleword variable? a.

b.

c.

d.

mov ebp,esp push ebp sub esp,4 push ebp mov esp,ebp add esp,4 push ebp mov ebp,esp sub esp,4 push ebp mov ebp,esp add esp,4

12. Which of the following defines an array local variable consisting of 50 signed words? a. LOCAL wArray[50]:SWORD b. LOCAL wArray:SWORD[50] c. LOCAL SWORD[50]:wArray d. LOCAL SWORD:wArray[50] 13. What advantages do stack parameters have over register parameters? a. Stack parameters reduce code clutter because registers do not have to be saved and restored. b. Programs using stack parameters execute more quickly. c. Stack parameters are compatible with high-level languages. d. Register parameters are optimized for speed.

14. What advantages does INVOKE offer over the CALL instruction?

Irvine, Kip R. Assembly Language for Intel-Based Computers, 4th Edition

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a. None. INVOKE is just a synonym for CALL. b. INVOKE permits you to pass arguments separated by commas. c. CALL does not require the use of the PROTO directive. d. INVOKE executes more quickly than CALL. 15. Which of the following INVOKE statements are invalid? a. INVOKE mySub, [array+2] b. INVOKE mySub, 30 c. INVOKE mySub, ADDR myList d. INVOKE mySub, PTR myList 16. Which of the following are true regarding the ADDR operator? a. ADDR makes it possible to pass arguments by reference. b. ADDR passes a pointer on the stack. c. ADDR always passes parameters by value. d. ADDR is not permitted in Real-mode programs.

17. Which of the following PROC statements are invalid? a. b.

MySub PROC val1:WORD, val2:DWORD MySub PROC, val1:WORD, val2:DWORD PTR

c.

MySub PROC, val1:BYTE, val2:SDWORD d.

MySub PROC, val1:PTR WORD, val2:DWORD

18. Which of the following PROTO statements are invalid? a.

b.

c.

d.

MySub PROTO, val1:WORD, val2:DWORD MySub PROTO USES eax, val1:WORD, val2:DWORD MySub PROTO USES eax ebx, val1:WORD, val2:DWORD MySub PROTO, val1:WORD, val2:DWORD LOCAL v1:BYTE

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19. When saving and restoring registers with PUSH and POP, which of the following are common mistakes? a. The operand order is the same between PUSH and POP, as in: push eax push ebx ...(some other code) pop eax pop ebx b. The operand order is reversed in POP, as in: push eax push ebx ...(some other code) pop ebx pop eax c. PUSH is coded before a loop begins, but the corresponding POP is inside the loop. d. Both PUSH and its corresponding POP occur within the same loop.

20. Assuming that a procedure contains no local variables, a stack frame is created by which sequence of actions at runtime? a. arguments pushed on stack; procedure called; EBP pushed on stack; EBP set to ESP b. EBP pushed on stack; arguments pushed on stack; procedure called; EBP set to ESP c. arguments pushed on stack; EBP pushed on stack; EBP set to ESP; procedure called d. arguments pushed on stack; procedure called; EBP set to ESP; EBP pushed on stack 21. Which action must take place inside a procedure to reserve space on the stack for two doubleword local variables? a. after PUSH EBP, subtract 8 from the base pointer (EBP) b. after PUSH EBP, add 8 to the base pointer (EBP) c. after MOV EBP,ESP, add 8 to the stack pointer (ESP) d. after MOV EBP,ESP, subtract 8 from the stack pointer (ESP) 22. Which of the following are valid language specifiers in the .MODEL directive? a. PASCAL, FORTRAN, C b. C, SYSCALL, STDCALL c. BASIC, JAVA, C d. C, ADA, SYSCALL 23. Which language specifiers in the .MODEL directive dictate that procedure arguments be pushed on the stack in reverse order? a. C b. PASCAL c. STDCALL d. none of the above 24. Which of the following are true about the C language specifier in the .MODEL directive? a. The RET instruction removes parameters from the stack. b. The calling program removes parameters from the stack.

Irvine, Kip R. Assembly Language for Intel-Based Computers, 4th Edition

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c. Inside the procedure, the POP instruction removes parameters from the stack before RET executes. d. After the CALL instruction, a constant value is added to ESP to remove parameters from the stack.

25. How does using the LEA instruction differ from using the OFFSET operator with MOV? a. LEA cannot have an indirect source operand, whereas MOV-OFFSET can. b. MOV-OFFSET retrieves a 32-bit offset, whereas LEA retrieves a combined segment-offset address. c. LEA is effective for obtaining the address of a stack parameter. d. The source operand used by LEA must be a constant value known at assembly time.

26. If a procedure recursively calls itself millions of times, what is the likely result? a. The program will continue to run until interrupted by the user. b. The number of recursive calls will be limited by the value placed in the RL (recursion limiter) register. c. The amount of memory usage will be constant, because the procedure is simply branching to its own offset. d. The stack will overflow.

Example 1: The MySub Procedure MySub PROC, N:DWORD cmp N,7 je L1 mov eax,N inc eax INVOKE MySub,eax L1: ret MySub ENDP 27. Consider the procedure named MySub in Example 1. Which of the following statements are true? a. MySub uses 4 doublewords of stack space each time it is called. b. MySub is recursive c. MySub terminates when N is equal to 7. d. the parameter N is equivalent to [EBP+4] 28. Consider the MySub procedure from the previous question. If it were called with N = 5, how many times would the RET instruction execute? a. 2 times b. 3 times c. 4 times d. 5 times 29. If we were to expose the code generated by MASM for MySub in Example 1, which of the following would match that code most closely? a.

MySub PROC push ebp

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cmp DWORD PTR [ebp+4],7 je L1 inc eax mov eax,[ebp+4] push eax call MySub L1: pop ebp ret MySub ENDP b.

c.

d.

MySub PROC push ebp mov ebp,esp cmp DWORD PTR [ebp+8],7 je L1 mov eax,[ebp+8] inc eax push eax call MySub L1: pop ebp ret 4 MySub ENDP MySub PROC mov ebp,esp cmp DWORD PTR [ebp+8],7 je L1 mov eax,[ebp+8] push eax inc eax call MySub L1: ret 4 MySub ENDP MySub PROC cmp DWORD PTR [ebp+8],7 je L1 mov eax,[ebp+8] inc eax push eax call MySub L1: ret 4 MySub ENDP

Example 2: The Accum Procedure main PROC mov eax,0 push 8 call Accum call DumpRegs exit

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main ENDP Accum PROC push ebp mov ebp,esp mov ebx,[ebp+8] cmp ebx,2 je L1 add eax,ebx sub ebx,2 push ebx call Accum L1: pop ebp ret 4 Accum ENDP 30. Refer to Example 2. What will be the value of EAX when DumpRegs is called? a. 8 b. 0Ah c. 12h d. 14h 31. Refer to Example 2. What will be the value of EBX when DumpRegs is called? a. 2 b. 4 c. 6 d. 8 32. Refer to Example 2. How many stack bytes are used by each call to Accum? a. 4 bytes b. 8 bytes c. 12 bytes d. 16 bytes 33. Refer to Example 2. How many times will the ADD EAX,EBX statement execute? a. 2 b. 3 c. 4 d. cannot be determined 34. Refer to Example 2. Suppose we changed the last statement in the Accum procedure to the following: ret

8

What would happen when running the program? a. The program would run in the same manner. b. The program would halt with a runtime error. c. When DumpRegs was called, EAX would be smaller than before.

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d. The PUSH EBX instruction would execute two times.

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Chapter 9 Test Bank Note to instructors: To view the answers, select Tools | Options | View | Hidden Text.

Short Programming Problems 1.

Using the following definition of a two-dimensional array, write a sequence of instructions that use a base-index operand to move the element at row 2, column 3 to AX. (Row and column numbers begin at 0): .data ROWSIZE = 5 NUMROWS = 4 twArray WORD NUMROWS DUP( ROWSIZE DUP(?) )

2.

Using the following data definitions, write instructions that use MOVSB to copy all the bytes from source to target: .data source BYTE 50 DUP(?) target BYTE 100 DUP(?)

3.

Write a sequence of instructions using MOVSB that append source to the end of target. The first three instructions have been written for you: .data source BYTE "HIJKLMNOPQRS",0 target BYTE "ABCDEFG",50 DUP(0) .code INVOKE Str_length, ADDR target mov edi,OFFSET target add edi,eax

4.

Write a sequence of instructions that use SCASD to search arrayD for the first value that is not the same as the current contents of EAX. When the search is completed, move the value you have found into EAX: arrayD SDWORD 50 DUP(?)

5.

Write a sequence of instructions that use STOSD to fill each position of arrayD with the largest possible 32-bit positive integer: arrayD SDWORD 20 DUP(?)

6.

Write a sequence of instructions using CMPSD that compare arrayA to arrayB in reverse order.

After the comparison, move the first pair of non-matching array values to EAX and EBX. COUNT = 5 arrayA DWORD COUNT DUP(?) arrayB DWORD COUNT DUP(?)

7.

Write a sequence of instructions using LODSB and STOSB that copy each character from arrayA to arrayB, converting it to lowercase in the process. Note: setting bit 5 in an uppercase character will convert it to lowercase: arrayA BYTE "ABCDEFGHI" arrayB BYTE LENGTHOF arrayA DUP(0)

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Multiple-Choice (Each of the following questions has just one correct answer) 8.

The REPE prefix does which of the following? a. repeats an instruction while the Zero flag is clear b. repeats an instruction while the Zero flag is set c. repeats an instruction while the Carry flag is clear d. repeats an instruction while the Carry flag is set

9.

If a bubble sort requires 0.2 seconds to sort an array of 1,000 elements, how many seconds will it require to sort 10,000 elements? Hint: bubble sort is an O(n2) algorithm. a. 2 seconds b. 20 seconds c. 200 seconds d. 4 seconds

10. Which instruction causes the ESI and EDI registers to be incremented by the MOVSB instruction? a. CLC b. REP c. STD d. CLD 11. The MOVSB instruction uses which register as the source operand? a. ESI b. EDI c. EAX d. ECX

Example 1 .data var1 BYTE 10 var2 BYTE 20 var3 BYTE 30 .code mov esi,OFFSET var2 mov edi,OFFSET var1 cmpsb ja L1 jb L2 je L3 12. To which label will the program jump in Example 1? a. L1 b. L2 c. L3

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d. cannot be determined from the information given 13. In Example 1, where will ESI point after the CMPSB instruction executes? a. at var1 b. at var2 c. at var3 d. cannot be determined from the information given 14. If var1 and var2 were changed to type SWORD in Example 1, what change(s) would have to be made to the instructions in the code segment? a. change CMPSB to CMPSW b. change CMPSB to CMPSD c. change JA to JG, and change JB to JL d. none of the above

Example 2 1: 2: 3: 4: 5: 6: 7: 8:

.data str1 BYTE "1324A2342424",0 .code mov edi,OFFSET str1 mov al,'A' cld repne scasb mov bl,[edi]

15. In Example 2, assume that str1 is located at offset 00040010h. What will be the value of EDI after line 7 executes? a. 00040010h b. 00040013h c. 00040014h d. 00040015h 16. In Example 2, if we change line 6 to "std", what value will be moved to BL after line 8 executes? a. ASCII code of "4" b. ASCII code of "A" c. ASCII code of "2" d. cannot be determined 17. In Example 2, if we change line 7 to "repe scasb", what value will be moved to BL after line 8 executes? a. ASCII code of "3" b. ASCII code of "A" c. ASCII code of "2" d. cannot be determined 18. Which letter choice contains instructions that will fill all elements of arrayW with FFFFh? arrayW WORD 50 DUP(?)

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a.

b.

c.

d.

mov ax,0FFFFh mov edi,OFFSET arrayW mov ecx,SIZEOF arrayW cld rep stosb mov ax,0FFFFh mov edi,OFFSET arrayW mov ecx,LENGTHOF arrayW cld rep stosw mov ax,0FFFFh mov esi,OFFSET arrayW mov ecx,SIZEOF arrayW std rep stosw mov ax,0FFFFh mov esi,OFFSET arrayW mov ecx,LENGTHOF arrayW cld repz stosw

19. Assume that pString is a doubleword that contains the offset of a string. Which of the following letter choices contains code that will set EAX to the length of the string? (The length should not count the string's null byte.) a.

L1:

mov edi,pString mov eax,0 cmp BYTE PTR [edi],0 je L2 inc edi inc eax jmp L1

L2: b.

L1:

mov edi,pString mov eax,0 cmp BYTE PTR [edi],0 jne L2 inc edi jmp L1

L2: c.

L1:

mov edi,pString mov eax,0 cmp BYTE PTR [edi],0 jae L2 inc edi inc eax jne L1

L2:

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d.

L1:

mov edi,pString cmp BYTE PTR [edi],0 ja L2 inc edi inc eax jnz L1

L2: 20. Suppose we want to convert the letters in myString to uppercase (by clearing bit 5 of each character). Lines 1 through 6 are the first part of the implmentation: .data myString BYTE "abCDefg123hij",0 .code 1: mov esi,OFFSET myString 2: L1: mov al,[esi] 3: cmp al,0 4: je L3 5: cmp al,'a' 6: jb L2 Which letter choice contains the best alternative for the remaining instructions? a.

b.

c.

d.

7: 8: 9: 10: L2: 11: 12: L3:

cmp al,'z' jbe L3 and BYTE PTR [esi],11011111b inc esi jmp L1 ret

7: 8: 9: 10: L2: 11: 12: L3:

cmp al,'z' jna L2 and BYTE PTR [esi],11011111b inc esi jmp L1 ret

7: 8: 9: 10: L2: 11: 12: L3:

cmp al,'z' ja L2 and BYTE PTR [esi],11011111b inc esi jmp L1 ret

7: 8: 9: 10: L2: 11: 12: 13: L3:

cmp al,'z' ja L2 and BYTE PTR [esi],11011111b jnz L3 inc esi jmp L1 ret

21. Given the following declaration of a two-dimensional array, which letter choice contains statements that correctly calculate the sum of column 0? .data

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ROWSIZE = 5 NUMROWS = 4 twArray WORD NUMROWS DUP( ROWSIZE DUP(?) ) a.

L1:

b.

L1:

c.

L1:

d.

L1:

mov esi,OFFSET twArray mov edi,0 mov ecx,NUMROWS mov ax,0 add ax,twArray[esi+edi] add esi,ROWSIZE loop L1 mov esi,0 mov edi,OFFSET twArray mov ecx,NUMROWS mov ax,0 add ax,twArray[esi+edi] add esi,ROWSIZE loop L1 mov esi,0 mov edi,0 mov ecx,NUMROWS + ROWSIZE mov ax,0 add ax,twArray[esi+edi] add esi,ROWSIZE loop L1 mov esi,0 mov edi,0 mov ecx,NUMROWS mov ax,0 add ax,twArray[esi+edi] add esi,(ROWSIZE * TYPE twArray) loop L1

Example 3 1: 2: 3: 4: 5: 6: 7: 8: 9: 10: 11: 12:

.data str1 BYTE "AAAX",0 str2 BYTE 10 DUP(0FFh) .code mov edi,0 L1: mov al,[str1+edi] cmp al,0 je L2 mov [str2+edi],al inc edi jmp L1 L2:

22. After Example 3 executes, what value will be stored at offset [str2+4]? a. 0FFh

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b. ASCII code of "X" c. 00h d. cannot be determined 23. In Example 3, if we changed lines 7, 8, and 9 to the following, what value would be stored at offset [str2+4] after the loop finished?

7: 8: 9:

mov [str2+edi],al cmp al,0 je L2

a. 0FFh, b. ASCII code of "X" c. 00h d. cannot be determined

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Chapter 10 Test Bank Note to instructors: To view the answers, select Tools | Options | View | Hidden Text in MS-Word.

Fill in the Blanks and Short Answer 1.

Define a structure named ThreeInts containing three unsigned doublewords named field1, field2, and field3. The fields should be uninitialized.

2.

Using the ThreeInts structure from the previous question, declare a variable named first of type ThreeInts:

3.

Using the ThreeInts structure from the previous question, write a statement that assigns the value 10h to field1:

4.

Using the ThreeInts structure from the previous question, write a statement that creates a variable named pThree that contains the offset of ThreeInts.

Short Programming Problems Example 1 POINT STRUCT X WORD ?

Y WORD ?

POINT ENDS POLY STRUCT points POINT 10 DUP(<>) numPoints WORD ?

POLY ENDS 5.

Using Example 1, declare a variable named aPoint of type POINT that initializes X to 10 and Y to 20:

6.

Using Example 1, declare a variable named aPoly of type POLY that uses default structure values.

7.

Using Example 1, set the first element of the aPoly.points array to X=1, Y=2.

8.

Using Example 1, set the second element of the aPoly.points array to X=3, Y=4.

9.

Using Example 1, write a sequence of statements that initialize all X values in the aPoly.points array to random integers between 0 and 99. Use an indexed operand to access the points array.

10. Write a sequence of statements that first set ESI to the offset of aPoly. Next, use ESI as an indirect operand to set the numPoints field to 2.

11. Declare an array of two POLY structures named myArray. Use default initialization for both.

Example 2 RECT STRUCT Left WORD ?

Top WORD ?

Right WORD ?

Bottom WORD ?

RECT ENDS

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AnyData UNION mTitle BYTE 10 DUP(?) mRect RECT <> AnyData ENDS 12. Using Example 2, declare a variable named myData of type AnyData.

13. Using Example 2, move the letter "A" to the first byte of the mTitle field.

14. Using Example 2, move 10 to the Left field within the mRect field of myData.

15. Using Example 2, use the SIZEOF operator to set ECX to the size of the mTitle field in the AnyData union:

Example 3 POINT STRUCT X WORD ?

Y WORD ?

POINT ENDS Rectangle STRUCT upperLeft POINT <> lowerRight POINT <> Rectangle ENDS 16. Using Example 3, declare a Rectangle variable named myRect. In the same delcaration, initialize its upperLeft field to (10,20) and its lowerRight field to (50,60).

17. Using Example 3, declare an array of three Rectangles named myArray and initialize the rectangles to the same coordinates as the variable in the previous question.

18. Using indirect addressing with ESI, assign a value of 80 to the X-coordinate of the upper left corner of the third rectangle in myArray (from the previous question).

(The following questions are not related to Example 3.)

19. Create a macro named putChar that writes a single character, passed as a macro argument, to standard output. Be sure to push and pop any registers modified by the macro.

20. Create a macro named mMove16 that moves any 16-bit memory operand to any other 16-bit memory operand. Save and restore any registers modified by the macro. Syntax: mMove destination,source 21. Create a macro named mMult16 that multiplies any two signed 16-bit memory operands and produces a 16-bit product. Syntax: mMult16 product,op1,op2 22. Create a macro named mWriteHex that writes the value of a 32-bit memory operand to standard output in hexadecimal format.

23. Using the mWriteHex macro from the previous question, write a statement that invokes the macro, using ESI as an indirect operand.

24. Create a macro named mWriteHexConst that lets the caller pass an integer constant argument.

The integer is written to standard output in hexadecimal format. All labels must be local.

25. Create a macro named LongLoop that is not constrained by the LOOP instruction's limited −128 to +127 byte range. All labels must be local.

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26. Write a macro named mShowValue that writes a literal string to standard output, followed by the contents of an integer variable in unsigned decimal. Push and pop any registers modified by the macro. All labels must be local. Following is a sample call: .data salary DWORD 52100 .code mShowValue "Salary is equal to: ", salary 27. Write a sequence of statements that exits a macro if the count argument is blank.

28. Write a sequence of statements that displays an error message on the console during assembly if the first macro argument named count is identical to "ECX". Make the comparison caseinsensitive.

29. Write a macro named myMac that has a single parameter named first, which is given a default argument initializer of 0. The macro should move first to the EAX register.

30. The mWrite macro shown in Chapter 10 displays a string literal on the console. A sample call is: mWrite "Hello there" Show how to call mWrite and pass it a string that contains both ordinary characters and carriagereturn/linefeed bytes (0Dh, 0Ah).

31. Use the REPEAT directive to define an array named myArray that contains 50 16-bit unsigned words, with initial values based on the following sequence: {5,7,9,...,103} 32. Use the FOR directive to create five uninitialized DWORD variables in which each variable name is a member of the following list: monday,tuesday,wednesday,thursday,friday.

33. Write down the contents of the first five rows (in hexadecimal) of the table generated by the following statements: count = 0 FORC digit,<0123456789ABCDEF> BYTE count,"&digit" count = count + 1 ENDM

Multiple-Choice (Each of the following questions has only one correct answer.)

34. What data definitions will be created by the following directives?

FOR colorVal,<red,green,blue,turquoise,purple,orange> BYTE "&colorVal",0 ENDM a. six strings, each equal to "&colorVal", followed by a null byte. b. six null-terminated strings, each containing the name of a different color c. six variables, each having a label whose name is a color d. this statement will cause a syntax error 35. Which of the following statements permits assembly if the symbol Win32 has been defined? a. IF Win32 == 1 b. IF DEFINED Win32

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c. IFDEF Win32 d. IFNDEF Win32 36. Which of the following statements permits assembly if arg1 is exactly the same as arg2? (Assume that a case-senstitive comparison is used.) a. IFEQUAL <arg1>,<arg2> b. IFIDN <arg1>,<arg2> c. IF arg1 EQ arg2 d. IFEQ arg1,arg2

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Chapter 11 Test Bank Note to instructors: To view the answers, select Tools | Options | View | Hidden Text in MS-Word.

Fill-in-the-Blank 1.

A(n) ____________ is a collection of types, constants, and functions that provide a way to directly manipulate objects through programming. (3 words)

2.

The _______ character set, used by Windows XP, uses 16 bits for each character and represents characters from many different languages.

3.

The HANDLE data type in MS-Windows is equivalent to MASM's _________ type.

4.

The LPSTR data type in MS-Windows is equivalent to MASM's ___________ type.

5.

The ___________ function in the Windows API writes a character string to a console screen buffer beginning at the current cursor location.

6.

When performing single-character input, you have to change the console flag values by calling the _______________ function.

Multiple-Choice 7.

Which Windows API function reads a single character from input? a. ReadChar b. ReadConsole c. ReadConsoleBuffer d. ReadInputByte

8.

The WriteString procedure in the Irvine32 library is actually a wrapper around which Windows API function? a. WriteFile b. WriteOutputBuffer c. PrintConsole d. WriteConsole

9.

Which Windows API function copies an array of characters to consecutive cells of the console screen buffer, beginning at a specified location? a. WriteArray b. WriteConsoleOutputCharacter c. WriteConsoleScreenBuffer d. WriteConsoleArray

10. Which Windows API function opens an existing file for input? a. OpenFile b. MakeFile c. CreateFile d. OpenInputFile

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11. Which of the following is not one of the CreationDisposition parameter options required when creating a new file? a. CREATE_NEW b. CREATE_ALWAYS c. OPEN_ALWAYS d. TRUNCATE_NEW 12. When moving the file pointer with SetFilePointer, which of the following is not a possible moveMethod value? a. FILE_BEGIN b. FILE_CURRENT c. FILE_REVERSE d. FILE_END 13. What happens when SetConsoleCursorPosition sets the cursor position to an area of the screen buffer that is not currently visible? a. the cursor is not displayed b. the console window is shifted to make the cursor visible c. a runtime error results d. the cursor is moved to the upper-left corner of the visible window 14. In protected mode, how is a variable's offset translated into a linear address by the processor? a. Uses the segment selector to look up the segment descriptor. Adds the segment's base address to the variable's offset. b. Shifts the segment selector left 4 bits and adds the offset, producing a linear address. c. Combines the value of the GDTR register with the segment selector in the logical address, and adds the segment base to the variable's offset. d. Uses the LDTR register to locate the appropriate entry in the segment descriptor table, which contains the variable's linear address.

15. (True/False) When implementing paging, the processor uses a 10-bit directory field in the linear address. This directory field contains the base address of a page table. a. true b. false

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Chapter 12 Test Bank Note to instructors: To view the answers, select Tools | Options | View | Hidden Text in MS-Word.

Fill-in-the-Blank 1.

In the IEEE double precision format, how many bits are reserved for the exponent, sign, and fractional part?

2.

In single-precision format, suppose the exponent bits equal 01111111. What is the actual exponent?

3.

Using decimal fractions with denominators that are powers of 2, write the equivalent of binary .1011.

4.

What single decimal fraction equals binary .0011?

5.

What is the binary equivalent of decimal 3 3/4?

6.

Normalize the binary number 1001.1111.

7.

Convert the following infix expression to postfix: (6 + 4) * 5

8.

Which FPU register number (R0 through R7) is identified as ST(0)?

9.

Which FPU register determines the precision and rounding methods for calculations?

10. If the divide by zero exception flag in the FPU is set, what happens when the FPU tries to execute a division by zero?

11. Explain the FSTP instruction, used a single memory operand 12. Write a sequence of instructions that adds the two single-precision reals named valOne and valTwo. Place the sum in valThree.

13. Write a sequence of instructions that divides the variable valOne by valTwo and places the dividend in valThree.

14. Identify the first three fields in the Intel IA-32 instruction format.

15. What is the purpose of the SIB field in IA-32 instructions?

16. Why was the operand-size prefix byte field created?

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Chapter 13 Test Bank Note to instructors: To view the answers, select Tools | Options | View | Hidden Text in MS-Word.

Fill-in-the-Blanks 1.

A program's ______ model determines the segment size, and whether calls and references will be near (within the same segment) or far (between different segments).

2.

What is the name of the technique used by C++ and other languages that adds characters to function names and permits function overloading? ____________

3.

Name a high-level programming language that makes all external identifiers case-sensitive: _____

4.

Visual C++ generates two types of target programs: Debug and _________.

5.

The ______ keword in Microsoft Visual C++ causes the compiler to pass parameters to functions using registers (rather than passing them on the stack).

True-False 6.

The Visual C++ compiler always preserves ECX and EDX when implementing functions. a. true b. false

7.

Inline ASM statements in Visual C++ remove the need for calling and returning from an assembly language procedure. a. true b. false

8.

Inline ASM statements in Visual C++ cannot use the STRUCT directive. a. true b. false

9.

Inline ASM statements in Visual C++ can use the LENGTHOF operator, but not the LENGTH operator. a. true b. false

10. Inline ASM statements in Visual C++ cannot use the PTR operator. a. true b. false 11. Arguments are passed by C++ programs from right to left, meaning that the rightmost argument is the first to be pushed on the stack. a. true b. false 12. The C language automatically appends two underscores to the beginning of each external identifier. a. true b. false

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13. The ReadSector program in Chapter 12 links assembly language code to a Borland C++ application, running under a 16-bit memory model. a. true b. false

Multiple-Choice 14. Which of the following criteria is not part of a language's calling convention? a. which registers must be preserved by procedures b. the order in which arguments are passed to procedures c. how the stack pointer is restored after a procedure call d. the size factor when decrmenting the stack pointer 15. The primary disadvantage to writing inline assembly language code in Visual C++ is: a. poor runtime performance b. lack of portability c. inability to reference variables declared outside the inline block d. 32-bit registers cannot be used

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Chapter 14 Test Bank Note to instructors: To view the answers, select Tools | Options | View | Hidden Text in MS-Word.

Fill-in-the-Blank 1.

_______ was the first operating system to support Real-mode programming on the IBM-PC.

2.

When the INT 21h instruction is used, we often call this an MS-DOS ________ call.

3.

In Real-address mode, the lowest _____ kilobytes of memory are used by both the operating system and application programs.

4.

The ______, located at F0000h, contains low-level input-output procedures used by application programs.

5.

The resident ________ processor is loaded into memory just above the DOS Kernel.

6.

The ____ instruction is always the last instruction executed by an interrupt handler.

7.

Video services are provided by ____ function calls.

8.

INT 21h Function ___ terminates a process.

9.

If you want to display a character string in color, you would use INT 10h Function ___.

10. If you wanted to get the current system date, you would use the _______ function call.

Multiple-Choice 11. The INT 10h instruction is able to run in either Real mode or Protected mode. a. true b. false 12. Real-mode programs cannot modify the contents of data belonging to the operating system. a. true b. false 13. Video graphics memory begins at which absolute address? a. B0000h b. A0000h c. C0000h d. D0000h 14. If you wanted to create a new file using an MS-DOS function call, which one would you use? a. INT 10h, function 05h b. INT 21h, function 02h c. INT 21h, function 716Ch d. INT 21h, function 10h 15. When you want to read from a file that has already been opened, what special value is placed in the BX register? a. a pointer to the filename

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b. the file handle c. the address of the file handle d. the number of bytes you want to read

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Chapter 15 Test Bank Note to instructors: To view the answers, select Tools | Options | View | Hidden Text in MS-Word.

Fill-in-the-Blank 1.

At the hardware level of a disk storage system are platters, sides, _____, cylinders, and sectors.

2.

A ____ operation moves a disk's read/write heads from one track to another.

3.

A ________ refers to all tracks accessible from a single position of the read/write heads.

4.

A ________ file is one whose sectors are no longer located in contiguous areas of the disk.

5.

After the disks physical geometry has been translated, the operating system can work with what are called _____ sector numbers.

6.

Another word for a disk partition is a disk ______.

7.

A(n) _______ partition can be divided into an unlimited number of logical partitions.

8.

The ________, created when the first partition is created on a hard disk, is located in the drive’s first logical sector. (3 words)

9.

A FAT-type file system provides a mapping of logical sectors to _______, the basic unit of storage for all files and directories.

10. The __________ in an MS-DOS file directory entry indicates the file's location on the disk. (3 words)

Multiple-Choice 11. A cylinder refers to all tracks accessible from a single position of the read/write heads. a. true b. false 12. Logical sectors are magnetically (invisibly) marked on the disk by the manufacturer, using what is called a low-level format. a. true b. false 13. On a typical Windows XP system, each logical partition is assigned a separate drive letter. a. true b. false 14. In a FAT-style file system, what is the smallest unit of storage for individual files? a. logical sector b. partition c. cluster d. physical sector 15. Which of the following file systems supports Unicode filenames? a. FAT16 b. FAT32

Irvine, Kip R. Assembly Language for Intel-Based Computers, 4th Edition

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c. NTFS d. both FAT32 and NTFS

Irvine, Kip R. Assembly Language for Intel-Based Computers, 4th Edition

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Chapter 16 Test Bank Note to instructors: To view the answers, select Tools | Options | View | Hidden Text in MS-Word.

Fill-in-the-Blank and Short Answer 1.

The BIOS data area is located at segment address _______.

2.

Which interrupt instruction is used when processing low-level keyboard input?

3.

Which interrupt service routine retrieves the keyboard scan code from the keyboard input port?

4.

What is the name of the buffer that holds keyboard characters while they are waiting to be processed by applications?

5.

What is the easiest way for a program to detect that the left shift key is currently held down by the user?

6.

Of the three levels of video access explained in Section 15.3, which has the best performance?

7.

How are colors and attributes assigned to characters in text mode?

8.

What is the 4-bit encoding for a light gray color attribute?

9.

In an 8-bit color attribute byte, what is the binary encoding of yellow text on a blue background?

10. When using direct memory mapped graphics, how are data values sent to the video adapter?

11. When calling INT 33h, how can you hide the mouse pointer?

12. What is the mickeys to pixel ratio?

13. Is it possible to restrict the mouse to a certain region of the video display?

Multiple-Choice (Some of the following questions have more than one correct answer. Circle all correct answers.)

14. A program that needs to check the keyboard input buffer while a loop is continually repeating should use which of the following functions? a. INT 10h Function 2 b. INT 16h Function 10h c. INT 16h Function 11h d. INT 21h Function 1 15. Which of the following is the correct binary encoding for blue text on a white background when using INT 10h, Function 9? a. 00011111 b. 11110001 c. 00010111 d. 01110010

Irvine, Kip R. Assembly Language for Intel-Based Computers, 4th Edition

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Chapter 17 Test Bank Note to instructors: To view the answers, select Tools | Options | View | Hidden Text in MS-Word.

Fill-in-the-Blank 1.

When you use the .MODEl directive, MASM automatically defines a group named _______ for the near data segment.

2.

The .CODE directive causes a code segment named _______ to be defined by MASM.

3.

Which memory models (in 16-bit mode) cause each source code module to be assigned a different segment name?

4.

When using the SEGMENT directive, what values can be used for the align parameter? .

5.

If a program is to run on an IA-32 processor, which align type is preferred?

6.

The _______ directive tells the assembler how to calculate offsets of code and data labels at assembly time. It is usually placed directly after the SEGMENT directive in the code segment.

7.

When you type a command and press Enter at the command prompt, what is the first action taken by the command processor?

8.

What value is stored at offset 2Ch in the Program Segment Prefix?

9.

How is a COM program different from an EXE program?

10. Suppose an EXE program contains a code area of 30h bytes, beginning at segment 04B0h.

Assuming the data segment is word-aligned, what would be the absolute address of the data segment, which immediately follows the code?

11. Where in memory is the Interrupt Vector Table located?

12. How long is each entry in the Interrupt Vector Table, in bytes?

13. What extra operation does the IRET instruction carry out that is not done by the RET instruction?

14. How does an interrupt handler prevent external hardware interrupts from interrupting the processor?

15. Which two INT 21h functions are required when getting and setting the value of an interrupt vector?

16. Two types of hardware-base input output are port-based and ______________.

17. How is the Intel 8253 Timer chip used when generating sound from the PC speaker?

Irvine, Kip R. Assembly Language for Intel-Based Computers, 4th Edition

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