lab1_v2.S

@@ -2,50 +2,26 @@
 .cpu cortex-m4
 .thumb
 
-.macro BKPT_WRITE addr_src
-    mov r1, \addr_src
-    mov r0, 0x4
-    bkpt 0xAB
-.endm
+.section .data
+    test_string: .asciz "Hello"
 
 .section .text
 
 lab1_v2:
-    push.n {lr}
+    sub sp, #6
+    ldr r0, =test_string
+    mov r1, #5
 
-    mov r0, #2073
-    bl int_to_str
+    copy_loop:
+    ldrb r2, [r0, r1]
+    strb r2, [sp, r1]
+    subs r1, #1
+    bpl copy_loop
 
-    pop.n {pc}
+    mov r1, sp
+    mov r0, 0x04
+    bkpt 0xAB
 
-int_to_str:
-    mov r3, sp
-
-    @ write newline + NULL terminator
-    mov r5, #0x000A
-    strh r5, [r3, #-2]!
-
-    @ --- handmade modulo ---
-    mov r4, #10
-
-    iterate:
-    mov  r1, r0       @ save orig to r1
-    udiv r0, r0, r4   @ orig/10 and overwrite old orig value
-    mul  r2, r0, r4   @ orig/10*10, place separately
-    subs r5, r1, r2   @ orig - orig/10*10 => modulo (and update flags)
-
-    beq check_if_pending_digits_exist
-    proceed_with_conversion:
-
-    add r5, #48           @ int -> char (only digits, so it's fine)
-    strb r5, [r3, #-1]!   @ write next char to RAM
-    b iterate
-
-    check_if_pending_digits_exist:
-    cmp r0, #0
-    bne proceed_with_conversion
-
-    finish:
-    BKPT_WRITE r3
+    add sp, #6
 
     mov pc, lr