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23 Cards in this Set
- Front
- Back
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What is an immediate operand?
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a constant value or the result of a constant expression.
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What is a register operand?
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refers to data stored in registers. The register name is converted to a number and encoded within the instruction
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What is a memory operand?
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a reference to a location in memory. The memory address is encoded within the instruction, or a register holds the address of a memory location
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What is a direct operand?
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a named reference to storage in memory (a fixed memory location)
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What is the syntax of a MOV instruction?
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mov destination, source
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In a MOV instruction, how many memory operands are permitted?
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one
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In a MOV instruction, can the operands be different sizes?
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no
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T or F:
The following is a permitted MOV instruction. mov eip, count |
FALSE
EIP is not a valid destination register |
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T or F:
The following is a permitted MOV instruction. mov 56, count |
FALSE
an immediate operand cannot be a destination |
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T or F:
the MOVZX instruction, the destination must be a register. |
TRUE
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T or F:
The MOVZX instruction permits the source and destination to be different sizes. |
TRUE
the destination must be equal to or larger than the source |
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When you copy a smaller value into a larger destination, the MOVZX instruction fills the upper half of the destination with _____ .
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0s
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T or F:
A signed value can be the source when using a MOVZX instruction. |
FALSE
the source must be unsigned, and the destination must be a register |
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What is the difference between MOVZX and MOVSX?
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MOVZX is for unsigned sources, and MOVSX is for signed sources
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When you copy a smaller value into a larger destination, the MOVSX instruction fills the upper half of the destination with _____ .
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1s
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T or F:
An unsigned value can be the source when using a MOVSX instruction. |
FALSE
the source must be signed, and the destination must be a register |
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When would you use MOVSX instead of MOV?
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When the source and destination are unequal in size
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T or F:
The MOVSX instruction permits the source and destination to be different sizes. |
TRUE
the destination must be equal to or larger than the source |
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What does the XCHG instruction do?
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exchanges the values of two operands
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What are the operand restrictions of XCHG?
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at least one operand must be a registry, no immediate operands are permitted, and operands must be the same size
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What is the notation for an 8-bit registry operand?
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reg8
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What is the notation for an immediate value operand?
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imm
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What is the notation for a memory operand?
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mem
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