The following instructions will set the overflow flag: mov al,0d7h add al,75h

67% found this document useful (3 votes)

555 views10 pages

CH 04

Original Title:

ch04.doc

Uploaded by

Rebecca Miles

Full description

The following statement will assemble without errors: mov DWORD PTR [eax],1234h

Free

True False

If AL contains +127 and you add 3 to AL,the Overflow flag will be set.

Free

True False

The following instruction will produce 1FFFFFFCh in EDX: movsx edx,-4

Free

True False

The MOVSX instruction can use a variable as the source operand.

True False

The Overflow flag will never be set when subtracting a positive integer from a negative integer.

True False

The SUB instruction requires the source operand to be no larger than the destination operand.

True False

When you move a 16-bit constant or an 8-bit constant into a 64-bit register,the upper bits of the destination operand are cleared.

True False

The format for the ADD instruction is: MOV source,destination

True False

The MOV instruction permits a move between two 8-bit memory operands,as long as one operand uses the BYTE PTR operator.

True False

The SAHF instruction copies the CPU status flags to the AH register.

True False

The following instructions will set the Overflow flag: mov al,80h sub al,-5

True False

The following instruction will assemble correctly: dec BYTE PTR [edi]

True False

Suppose BX and DX both contain positive integers.If adding them produces a negative result,the Overflow flag will be set.

True False

The EIP register can be the source operand of a MOV,ADD,or SUB instruction.

True False

The following instructions will set the Overflow flag: mov al,0D7h add al,75h

True False

•The following instructions will set the Overflow flag:mov al,0D7hadd al,75h•The following instruction will assemble correctly:inc [edi]•The following instructions will set the Overflow flag:mov al,125sub al,-5•The syntax for the MOV instruction is:MOVsource,destination•The MOV instruction requires both operands to be the same size.•The MOV instruction permits a move between two memory operands, as long as one operanduses the DWORD PTR operator.•The EIP register cannot be the destination operand of a MOV, ADD, or SUB instruction.

Part 2 Multiple Choice (each 3 points, total of 30 points). Please indicate all correct answersin the space provided in the left column. There might be more than one correct answer forsome questions!•Which directive identifies the part of a program containing instructions?•Which directive(s) are used when defining both signed and unsigned 64-bit integers?•In the AddSub program in Section 3.2, theexitstatement calls which predefined MS-Windows function to halt the program?•a. HaltProgramb. ExitProcessc. OS_Returnd. Exit_Program•Which of the following are valid data definition statements that create an array ofunsigned bytes containing decimal 10, 20, and 30, namedmyArray.•In the following data definition, assume thatList2begins at offset 2000h. What is the

Will the overflow flag be set if you add a positive integer to a positive integer and produce a negative result?

When you move a 16 bit constant or an 8 bit?

Which directive ends a procedure?

How many operands does each of the following instructions have a dec?