Step1. The following code copies a string from source to target: .data "This is the source string",0 SIZEOF source DUP (0) source ΒΥΤΕ target ΒΥTΕ .code ; index register ; loop counter mov esi,0 SEXSIZEQE source mov L1: aluseucselesil target[esi], al ; get char from source ; store it in the target ; move to next character ; repeat for entire string mov mov loop L1 mov edx, OFFSET source call Writestring mov edx, OFFSET target call WritestrİDE
Step1. The following code copies a string from source to target: .data "This is the source string",0 SIZEOF source DUP (0) source ΒΥΤΕ target ΒΥTΕ .code ; index register ; loop counter mov esi,0 SEXSIZEQE source mov L1: aluseucselesil target[esi], al ; get char from source ; store it in the target ; move to next character ; repeat for entire string mov mov loop L1 mov edx, OFFSET source call Writestring mov edx, OFFSET target call WritestrİDE
Computer Networking: A Top-Down Approach (7th Edition)
7th Edition
ISBN:9780133594140
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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please provide answer for each step
![**Step 1**: The following code copies a string from source to target:
```assembly
.data
source BYTE "This is the source string", 0
target BYTE SIZEOF source DUP(0)
.code
mov esi, 0 ; index register
mov ecx, SIZEOF source ; loop counter
L1:
mov al, source[esi] ; get char from source
mov target[esi], al ; store it in the target
inc esi ; move to next character
loop L1 ; repeat for entire string
mov edx, OFFSET source
call WriteString
mov edx, OFFSET target
call WriteString
```
Rewrite the program using indirect addressing rather than indexed addressing. **[Hint]** Use `OFFSET` operator to save the base address of `source` and `target`.
**Step 2**: Insert the following variables in your program:
**[Hint]** Use `movsx` or `movzx` operator to move 8/16-bit source to 32-bit register.
```assembly
.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 `DumpRegs` 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%2F5e8451bd-f095-4dbe-8110-f56cbfc121a1%2Faca60718-d9d2-4d53-bee2-39a247290841%2Fm0uzwz_processed.png&w=3840&q=75)
Transcribed Image Text:**Step 1**: The following code copies a string from source to target:
```assembly
.data
source BYTE "This is the source string", 0
target BYTE SIZEOF source DUP(0)
.code
mov esi, 0 ; index register
mov ecx, SIZEOF source ; loop counter
L1:
mov al, source[esi] ; get char from source
mov target[esi], al ; store it in the target
inc esi ; move to next character
loop L1 ; repeat for entire string
mov edx, OFFSET source
call WriteString
mov edx, OFFSET target
call WriteString
```
Rewrite the program using indirect addressing rather than indexed addressing. **[Hint]** Use `OFFSET` operator to save the base address of `source` and `target`.
**Step 2**: Insert the following variables in your program:
**[Hint]** Use `movsx` or `movzx` operator to move 8/16-bit source to 32-bit register.
```assembly
.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 `DumpRegs` statement, the following register values should display:
```
EAX=FFFFFFFF EBX=FFFFFFFE ECX=FFFFFFFD EDX=FFFFFFFC
```
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