Custom memset Implementation in Assembly

Overview

This project showcases a custom implementation of the memset function written in RISC-V assembly, integrated with a C program. The memset function is designed to fill a block of memory with a specified value, demonstrating low-level memory manipulation and efficient assembly programming.

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Files in the Project

• main.c: Contains the main C program that declares and calls the custom memset function.
• memset.s: Implements the memset function in RISC-V assembly, optimized for memory alignment and performance.
• README.md: This file, providing a comprehensive overview, instructions, and insights into the project.

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Functionality

The program performs the following tasks:

1. Declares a 32-byte character buffer in the C code.
2. Calls the custom memset function to fill the buffer with the character 'A'.
3. Prints the contents of the buffer to verify correct operation.

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Usage Instructions

Prerequisites

Before running this project, ensure the following tools and environment are available:

• A RISC-V toolchain (e.g., riscv64-unknown-elf-gcc).
• A RISC-V emulator (e.g., QEMU) or access to a physical RISC-V hardware platform.

Compilation and Execution

1. Save the C code in a file named main.c and the assembly code in a file named memset.s.
2. Compile and link the files using the RISC-V compiler: riscv64-unknown-elf-gcc -o memset_program main.c memset.s
3. Run the program: Using QEMU: qemu-riscv64 ./memset_program On RISC-V hardware: ./memset_program

Expected Output

The program will print 32 'A' characters in a single line: AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA