Trying to make stdout work

main.s

@@ -1,12 +1,73 @@
-.section .text
-.globl _start
+# 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"
+
+# Main program entry point
+.text
+.global _start
+.align 4
+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
 
 _start:
-    # Call the hello function
-    lui a0, %hi(_hello)    # Load upper immediate of _hello address
-    addi a0, a0, %lo(_hello)  # Add lower immediate of _hello address
-    jalr ra, a0, 0          # Jump and link to _hello, ra is return address
+    call h2
+    call test_routine
+    call hello
+
+    # Load the first number into register t0
+    lw t0, num1
+
+    # Load the second number into register t1
+    lw t1, num2
+
+    # Add the two numbers and store the result in register t2
+    add t2, t0, t1
+
+    # Store the result in memory
+    la t3, result
+    sw t2, 0(t3)
+
+    # Call _hello
+    la a0, result
+
+    # End program
+    ecall
+
+h2:
+    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'
+    ret
+
+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
+
+# To avoid the program from exiting
+loop: j loop
 
-    # Exit the program
-    li a7, 10               # syscall number for exit
-    ecall                   # Make the system call to exit