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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 BYTE .code ; index register ; loop counter mov esi,0 mov esXeSIZEQE source L1: mov alusQurcelesi] target[esi], al ins esi loop L1 ; get char from source ; store it in the target ; move to next character ; repeat for entire string mov 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.

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 BYTE .code ; index register ; loop counter mov esi,0 mov esXeSIZEQE source L1: mov alusQurcelesi] target[esi], al ins esi loop L1 ; get char from source ; store it in the target ; move to next character ; repeat for entire string mov 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.

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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All the steps should be done in one asm file. Comment all your source codes to let me know which part is involved in which 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 ``` ### Description: This assembly code snippet demonstrates how to copy a string from a source to a target using indexed addressing. - **Registers:** - `esi`: Used as an index register to traverse each character in the string. - `ecx`: Used as a loop counter to determine the number of characters to copy. - **Loop (L1):** - `mov al, source[esi]`: Retrieves the character from the source string at the current index. - `mov target[esi], al`: Stores the retrieved character in the target string. - `inc esi`: Increments the index to move to the next character. - `loop L1`: Repeats the process for each character in the string until all are copied. - **Write Operations:** - `mov edx, OFFSET source` and `call WriteString`: Outputs the source string. - `mov edx, OFFSET target` and `call WriteString`: Outputs the copied target string. ### Task: Rewrite the program using indirect addressing rather than indexed addressing. **Hint:** Use the `OFFSET` operator to save the base address of `source` and `target`.
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 ``` ### Description: This assembly code snippet demonstrates how to copy a string from a source to a target using indexed addressing. - **Registers:** - `esi`: Used as an index register to traverse each character in the string. - `ecx`: Used as a loop counter to determine the number of characters to copy. - **Loop (L1):** - `mov al, source[esi]`: Retrieves the character from the source string at the current index. - `mov target[esi], al`: Stores the retrieved character in the target string. - `inc esi`: Increments the index to move to the next character. - `loop L1`: Repeats the process for each character in the string until all are copied. - **Write Operations:** - `mov edx, OFFSET source` and `call WriteString`: Outputs the source string. - `mov edx, OFFSET target` and `call WriteString`: Outputs the copied target string. ### Task: Rewrite the program using indirect addressing rather than indexed addressing. **Hint:** Use the `OFFSET` operator to save the base address of `source` and `target`.
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