Assembly Programming: Lab10 Objectives: Code and test simple assembly programs. Step1. The following code copies a string from source to target: .data source BYTE "This is the source string",0 target BYTE SIZEOF source DUP(0) .code L1: mov esi,0 mov ecx,SIZEOF source mov al,source[esi] mov target[esi],al inc esi loop L1 mov edx, OFFSET source call WriteString mov edx, OFFSET target call WriteString ; index register ; loop counter ; get char from source ; store it in the target ; move to next character ; repeat for entire string Rewrite the program using indirect addressing rather than indexed addressing. [Hint] Use OFFSET operator to save the base address of source and target.
Assembly Programming: Lab10 Objectives: Code and test simple assembly programs. Step1. The following code copies a string from source to target: .data source BYTE "This is the source string",0 target BYTE SIZEOF source DUP(0) .code L1: mov esi,0 mov ecx,SIZEOF source mov al,source[esi] mov target[esi],al inc esi loop L1 mov edx, OFFSET source call WriteString mov edx, OFFSET target call WriteString ; index register ; loop counter ; get char from source ; store it in the target ; move to next character ; repeat for entire string Rewrite the program using indirect addressing rather than indexed addressing. [Hint] Use OFFSET operator to save the base address of source and target.
Computer Networking: A Top-Down Approach (7th Edition)
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Author:James Kurose, Keith Ross
Publisher:James Kurose, Keith Ross
Chapter1: Computer Networks And The Internet
Section: Chapter Questions
Problem R1RQ: What is the difference between a host and an end system? List several different types of end...
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![.T-Mobile LTE
x
.code
L1:
5:16 PM
Lab10.docx
Assembly Programming: Lab10
Objectives: Code and test simple assembly programs.
Step1. The following code copies a string from source
to target:
.data
source BYTE "This is the source string",0
target BYTE SIZEOF source DUP(0)
mov esi,0
mov ecx,SIZEOF source
mov al,source[esi]
mov target[esi],al
inc esi
loop L1
mov edx, OFFSET source
call WriteString
mov edx, OFFSET target
call WriteString
; index register
; loop counter
; get char from source
; store it in the target
55% 44
; move to next character
; repeat for entire string
Rewrite the program using indirect addressing rather
than indexed addressing. [Hint] Use OFFSET operator
to save the base address of source and target.](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2Fa6698ae8-6c01-4434-828e-21af6fc513df%2Fad5efda3-9176-4c2a-8335-24dac455da7d%2Fiqs3zv8_processed.jpeg&w=3840&q=75)
Transcribed Image Text:.T-Mobile LTE
x
.code
L1:
5:16 PM
Lab10.docx
Assembly Programming: Lab10
Objectives: Code and test simple assembly programs.
Step1. The following code copies a string from source
to target:
.data
source BYTE "This is the source string",0
target BYTE SIZEOF source DUP(0)
mov esi,0
mov ecx,SIZEOF source
mov al,source[esi]
mov target[esi],al
inc esi
loop L1
mov edx, OFFSET source
call WriteString
mov edx, OFFSET target
call WriteString
; index register
; loop counter
; get char from source
; store it in the target
55% 44
; move to next character
; repeat for entire string
Rewrite the program using indirect addressing rather
than indexed addressing. [Hint] Use OFFSET operator
to save the base address of source and target.
![Step2. Insert the following variables in your program:
[Hint] Use "movsx" or "movzx" operater to move
8/16bit source to 32bit register
.data
Uarray WORD 1000h, 2000h, 3000h, 4000h
Sarray SWORD -1, -2, -3, -4
Write instructions that use direct-offset addressing to
move the four values in Uarray to the EAX, EBX,
ECX, and EDX registers. When you follow this with a
call DumpRegs statement, the following register
values should display:
EAX=00001000 EBX=00002000 ECX=00003000
EDX=00004000
Next, write instructions that use direct-offset
addressing to move the four values in Sarray to the
EAX, EBX, ECX, and EDX registers. When you
follow this with a call DumpReg statement, the
following register values should display:
EAX=FFFFFFFF EBX=FFFFFFFE ECX=FFFFFFFD
EDX=FFFFFFFC](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2Fa6698ae8-6c01-4434-828e-21af6fc513df%2Fad5efda3-9176-4c2a-8335-24dac455da7d%2Ffp9slq6_processed.jpeg&w=3840&q=75)
Transcribed Image Text:Step2. Insert the following variables in your program:
[Hint] Use "movsx" or "movzx" operater to move
8/16bit source to 32bit register
.data
Uarray WORD 1000h, 2000h, 3000h, 4000h
Sarray SWORD -1, -2, -3, -4
Write instructions that use direct-offset addressing to
move the four values in Uarray to the EAX, EBX,
ECX, and EDX registers. When you follow this with a
call DumpRegs statement, the following register
values should display:
EAX=00001000 EBX=00002000 ECX=00003000
EDX=00004000
Next, write instructions that use direct-offset
addressing to move the four values in Sarray to the
EAX, EBX, ECX, and EDX registers. When you
follow this with a call DumpReg statement, the
following register values should display:
EAX=FFFFFFFF EBX=FFFFFFFE ECX=FFFFFFFD
EDX=FFFFFFFC
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