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1- What is the purpose of line 8?

1- What is the purpose of line 8?

Database System Concepts
Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
Section: Chapter Questions
Problem 1PE
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1- What is the purpose of line 8? 2- Why do we include line 18? 3- What can we replace lines 21 and 22 with? 4- What registers does _GetDate use? (Hint: find it in the book) 5- What register is at the top of the stack right after line 26? 6- Why are we pushing dx twice? 7- What register is at the top of the stack right after line 35? 8- Suppose the offset of line 61 is 00000080 and the offset of line 28 is 00000040, after the call instruction in line 27 what offset is ESP holding? What about EIP? 9- After the execution of line 69 what happens to the offsets in ESP and EIP? 10- What is the purpose of lines 36 and 37? 11-How does the assembler know where the start of the program is?
Transcribed Image Text:1- What is the purpose of line 8? 2- Why do we include line 18? 3- What can we replace lines 21 and 22 with? 4- What registers does _GetDate use? (Hint: find it in the book) 5- What register is at the top of the stack right after line 26? 6- Why are we pushing dx twice? 7- What register is at the top of the stack right after line 35? 8- Suppose the offset of line 61 is 00000080 and the offset of line 28 is 00000040, after the call instruction in line 27 what offset is ESP holding? What about EIP? 9- After the execution of line 69 what happens to the offsets in ESP and EIP? 10- What is the purpose of lines 36 and 37? 11-How does the assembler know where the start of the program is?
1 READING CODE - STACK 47 list the output of the following program assuming the input is as follows: 3 101 mov al, 0; Return code of 0 mov ah, 4ch: Exit back to MSDOS 48 49 4 232 50 int 21h Main ENDP 5 48 51 17 52 7 53 Data ; re-enter the data segment for this procedure include PCMAC.INC 54 NEWLINE EQU_PutCh 13, 10 MessageSub Mystery 55 DB 'Enter a number $' 10 56 DW ? 11 MODEL SMALL 57 12 STACK 100h DATA CODE ; return to coding 58 13 59 Messagel DB 'Total sold today, S' Message2 DB , is: $' Sublnput PROC mov cx, 4 14 60 15 61 16 62 myLoop: 17 63 CODE EXTERN GetDec: NEAR, PutDec NEAR PutStr MessageSub call GetDec add Mystery, ax 18 64 19 65 20 Main PROC 66 dec cx inz myLoop mov ax, Mystery 21 mov ax, @data ds, ax GetDate push cx push dx push dx call Sublnput send control to subprocedure mov bx, ax PutStr Messagel 67 22 mov 68 23 69 ret 24 70 25 71 Sublnput ENDP 26 72 73 END Main; Tells where to start execution 28 74 75 рop dx mov al, dh mov ah, 0 call PutDec PutCh " pop dx mov al, dl mov ah, 0 call PutDec 76 31 32 33 34 35 36 37 38 39 _PutCh " 40 рop сх 41 mov ax, cx call PutDec _PutStr Message2 42 43 44 45 mov ax, bx call PutDec NEWLINE 46
Transcribed Image Text:1 READING CODE - STACK 47 list the output of the following program assuming the input is as follows: 3 101 mov al, 0; Return code of 0 mov ah, 4ch: Exit back to MSDOS 48 49 4 232 50 int 21h Main ENDP 5 48 51 17 52 7 53 Data ; re-enter the data segment for this procedure include PCMAC.INC 54 NEWLINE EQU_PutCh 13, 10 MessageSub Mystery 55 DB 'Enter a number $' 10 56 DW ? 11 MODEL SMALL 57 12 STACK 100h DATA CODE ; return to coding 58 13 59 Messagel DB 'Total sold today, S' Message2 DB , is: $' Sublnput PROC mov cx, 4 14 60 15 61 16 62 myLoop: 17 63 CODE EXTERN GetDec: NEAR, PutDec NEAR PutStr MessageSub call GetDec add Mystery, ax 18 64 19 65 20 Main PROC 66 dec cx inz myLoop mov ax, Mystery 21 mov ax, @data ds, ax GetDate push cx push dx push dx call Sublnput send control to subprocedure mov bx, ax PutStr Messagel 67 22 mov 68 23 69 ret 24 70 25 71 Sublnput ENDP 26 72 73 END Main; Tells where to start execution 28 74 75 рop dx mov al, dh mov ah, 0 call PutDec PutCh " pop dx mov al, dl mov ah, 0 call PutDec 76 31 32 33 34 35 36 37 38 39 _PutCh " 40 рop сх 41 mov ax, cx call PutDec _PutStr Message2 42 43 44 45 mov ax, bx call PutDec NEWLINE 46
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