Assembly Language 1. Give the op code and number of bytes of code for each of th

Question

Assembly Language

1.         Give the op code and number of bytes of code for each of these instructions. 28 points

(a)        mov ecx, 984                                         Op Code______          Number of Bytes _____

(b)        xchg eax, ecx                                      Op Code______          Number of Bytes _____

(c)        add eax, ecx                                         Op Code______          Number of Bytes _____

(d)        add eax, value                                       Op Code______          Number of Bytes _____

            (assume value references a doubleword in memory)

(e)        inc edx                                                     Op Code______          Number of Bytes _____

(f)        inc DWORD PTR [edx]                        Op Code______          Number of Bytes _____

(g)        neg value                                                Op Code______          Number of Bytes _____

            (assume value references a doubleword in memory)

(h)        neg edx                                                       Op Code______          Number of Bytes _____

(i)         neg DWORD PTR [edx]                           Op Code______          Number of Bytes _____

(j)         add ecx, 894                                         Op Code______          Number of Bytes _____

(k)        imul eax, ecx                                      Op Code______          Number of Bytes _____

(l)         div value                                                Op Code______          Number of Bytes _____

            (assume value references a doubleword in memory)

(m)      div DWORD PTR [edx]                        Op Code______          Number of Bytes _____

(n)        cdq                                                                 Op Code______          Number of Bytes _____

Explanation / Answer

Following are the Op Codes and Number of Bytes :

(a)        mov ecx, 984 Op Code MOV , Number of Bytes= 1

(b)        xchg eax, ecx Op Code XCHG , Number of Bytes = 1

(c)        add eax, ecx Op Code ADD , Number of Bytes = 1

(d)        add eax, value Op Code ADD , Number of Bytes = 1

(e)        inc edx Op Code INC , Number of Bytes = 1

(f)        inc DWORD PTR [edx] Op Code INC , Number of Bytes = 1

(g)        neg value Op Code NEG , Number of Bytes = 2

            (assume value references a doubleword in memory)

(h)        neg edx   Op Code NEG , Number of Bytes = 2

(i)         neg DWORD PTR [edx] Op Code NEG , Number of Bytes = 4

(j)         add ecx, 894 Op Code ADD , Number of Bytes = 4

(k) imul eax, ecx Op Code : IMUL and Number of bytes = 2 (Signed multiplication)

(l) div value Op Code : DIV and Number of bytes = 2 (1 for quotient and another for reminder)

(m) div DWORD PTR [edx] Op Code : DIV and Number of bytes = 2

(n) cdq Op Code : CDQ and Number of bytes = 4 (converts double to quad)

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