Question

Q 2. Assuming a 32-bit operating environment, identify the mode of each operand in the following instructions. (Note: There are two operands in each instruction; identify both modes.) For a memory operand, specify whether it is direct memory mode or register indirect memory mode. Assume that the instructions are in a program also containing the code. .DATA value DWORD ? char BYTE *1. mov value, 100 2. movecx, value 3. mov ah, Oah *4. moveax, (esi] 5. mov [ebx], ecx 6. mov char, '! *7. add value, 1 8. add DWORD PTR [ecx], 10 9. add value, edx 10. add ecx, 5

Answer 1

Instruction 1 has operands named value and 100, out of which value is a direct-memory mode operand and 100 is a immediate operand.

Instruction 2 has "ecx" and "value" as the operands, where "ecx" is a register mode operand and "value" is direct-memory mode operand.

Instruction 3 has "ah" as the register operand and "0ah" as the immediate operand representing hexadecimal value.

In instruction 4 , eax is register operand and [esi] is a register-indirect memory operand.

In instruction 5, [ebx] is register-indirect memory operand and ecx is register operand.

In instruction 6, "char" is a direct-memory mode operand and "*" is the immeidate operand.

In instruction 7, "value" is a direct-memory mode operand and 1 is the immediate operand.

In instruction 8, PTR[ecx] is register-indirect memory operand and 10 is a immediate operand.

In instruction 9, "value" is a direct-memory operand and "edx" is register operand.

In instruction 10, "ecx" is a register operand and 10 is a immediate operand.

Please comment for any clarification.