June 2018 Update

Task/FizzBuzz/ARM-Assembly/fizzbuzz.arm

@@ -0,0 +1,119 @@
+/ * linux GAS */
+
+.global _start
+
+.data
+
+Fizz: .ascii "Fizz\n"
+Buzz: .ascii "Buzz\n"
+FizzAndBuzz: .ascii "FizzBuzz\n"
+
+numstr_buffer: .skip 3
+newLine: .ascii "\n"
+
+.text
+
+_start:
+
+  bl FizzBuzz
+
+  mov r7, #1
+  mov r0, #0
+  svc #0
+
+FizzBuzz:
+
+  push {lr}
+  mov r9, #100
+
+  fizzbuzz_loop:
+
+    mov r0, r9
+    mov r1, #15
+    bl divide
+    cmp r1, #0
+    ldreq r1, =FizzAndBuzz
+    moveq r2, #9
+    beq fizzbuzz_print
+
+    mov r0, r9
+    mov r1, #3
+    bl divide
+    cmp r1, #0
+    ldreq r1, =Fizz
+    moveq r2, #5
+    beq fizzbuzz_print
+
+    mov r0, r9
+    mov r1, #5
+    bl divide
+    cmp r1, #0
+    ldreq r1, =Buzz
+    moveq r2, #5
+    beq fizzbuzz_print
+
+    mov r0, r9
+    bl make_num
+    mov r2, r1
+    mov r1, r0
+
+    fizzbuzz_print:
+
+      mov r0, #1
+      mov r7, #4
+      svc #0
+
+      sub r9, #1
+      cmp r9, #0
+
+    bgt fizzbuzz_loop
+
+  pop {lr}
+  mov pc, lr
+
+make_num:
+
+  push {lr}
+  ldr r4, =numstr_buffer
+  mov r5, #4
+  mov r6, #1
+
+  mov r1, #100
+  bl divide
+
+  cmp r0, #0
+  subeq r5, #1
+  movne r6, #0
+
+  add r0, #48
+  strb r0, [r4, #0]
+
+  mov r0, r1
+  mov r1, #10
+  bl divide
+
+  cmp r0, #0
+  movne r6, #0
+  cmp r6, #1
+  subeq r5, #1
+
+  add r0, #48
+  strb r0, [r4, #1]
+
+  add r1, #48
+  strb r1, [r4, #2]
+
+  mov r2, #4
+  sub r0, r2, r5
+  add r0, r4, r0
+  mov r1, r5
+
+  pop {lr}
+  mov pc, lr
+
+divide:
+  udiv r2, r0, r1
+  mul r3, r1, r2
+  sub r1, r0, r3
+  mov r0, r2
+  mov pc, lr