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CS401 Assembly Language Question

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Respect (73%):
Date Posted: 7/22/2008 11:43:17 PM  Status: Closed
CS401 Assembly Language Question
Course Textbook Chapter Problem
Computer Architecture N/A N/A N/A
Question Details:

Take the example and explain the purpose and working of each instruction written in the following lines

1)      From lines 104 to 112

2)      From lines 129 to 135

3)      From lines 149 to 154

Answers:

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Karma Points: 954
Date Posted: 7/29/2008 10:10:16 PM  Status: Live
Asker's Rating: Helpful   
Response:
Dear.....
 
1)Lines 104-112
 
push bp            : save value of bp
mov bp, sp       : mark start of stack frame
sub sp, 2         : subtracts value of sp by 2
push ax           : save value of ax
push bx           : save value of bx 
xor ax, ax       : Performs boolean exclusive-OR between operands and stores value in ax
mov bx, 70      : sets 70 value to bx
mov word [bp-2], 0 : save bp and assign to 0
 
 
2) Lines 129-135
 
push ax   : place ax value on the top of  stack, top is incremented by 1
push bx            : place bx value on the top of stack
push es            : place bx value on the top of stack
mov ax, 0xb800 : assign  value at 0xb800 to ax 
mov es, ax         : move the value of ax to es  
xor bx, bx          : Performs boolean exclusive-OR between operands and stores value in ax
 
3)Lines 149-154
 
push bp           : save value of bp
mov bp, sp      : mark start of stack frame
sub sp, 2         : subtracts value of sp by 2
push ax           : save value of ax
push bx           : save value of bx 
push cx           : save value of cx



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