Risc-V-Asm/main.s

# Define variables
.data
.align 4
    num1: .word 5     # First number
    num2: .word 7     # Second number
    result: .word 0   # Variable to store the result
    msg: .ascii "Hello, World!\n"
    array: .space 100 # 100 bytes of space

# Main program entry point
.globl start
.text
start:
    call test_routine
    call hello_manual
    # call hello # This doesn't work
    call end
    ebreak

# Arbitrary test routine
test_routine:
    la a0, num1    # Load the address of num1 into register a6
    li a1, 10      # Load the value 10 into register a5
    xori a2, a1, 0x1  # Calculate the value of a2
    sw a1, 0(a0)    # Store the value in memory
    ret

# Prints "hello" manually
hello_manual:	
    addi a0, x0, 0x68
	li a1, 0x10000000
	sb a0, (a1) # 'h'

	addi a0, x0, 0x65
	sb a0, (a1) # 'e'

	addi a0, x0, 0x6C
	sb a0, (a1) # 'l'

	addi a0, x0, 0x6C
	sb a0, (a1) # 'l'

	addi a0, x0, 0x6F
	sb a0, (a1) # 'o'

    addi a0, x0, 0x0A
    sb a0, (a1) # '\n'
    ret

# Is supposed to print "Hello, World!\n" to stdout via ecall, but doesn't work
hello:
    # Write the string "Hello, World!\n" to stdout
    la a0, msg              # Load the address of the string into a0
    li a7, 4                # syscall number for write
    li a1, 13               # Length of the string
    li a2, 1                # File descriptor: stdout
    ecall                   # Make the system call to write
    ret                     # Return from the function

# Another routine, presumably written for the rars emulator?
hello2:
    li a0, 0x1
    la a1, msg
    li a2, 13
    li a7, 64
    ecall

# To avoid the program from exiting
loop: j loop