dsa lib bugfixes

resources/dsa/lib/io/print.dsa

@@ -65,7 +65,19 @@ print_word:
     ldw bpr, rg0, 8
     ldw current, rg1
 
-    stw rg0, rg1
+    addi rg1, 3
+
+    stb rg0, rg1
+    subi rg1, 1
+    shr rg0, 8
+    stb rg0, rg1
+    subi rg1, 1
+    shr rg0, 8
+    stb rg0, rg1
+    subi rg1, 1
+    shr rg0, 8
+    stb rg0, rg1
+
     addi rg1, 4
     jmp _end
 
@@ -175,18 +187,24 @@ print_newline:
     push bpr
     mov spr, bpr
 
+    // load variables into registers
     ldw display, rg0
     ldw current, rg1
+
+    // get the offset from the display base
     sub rg1, rg0, rg0
 
     lwi 80, rg2
+    pusha 3
     push rg0
     push rg2
     call maths::divmod
-    pop rg2
-    addi rg2, 80
-    ldw display, rg1
-    add rg1, rg2, rg1
+    pop zero  // result
+    pop rg3 // remainder
+    popa 3
+
+    sub rg1, rg3, rg2
+    addi rg2, 80, rg1
 
     // _end saves the display state
     jmp _end

resources/dsa/lib/maths/fib.dsa

@@ -4,24 +4,25 @@ fib_n:
 	push bpr
 	mov spr, bpr
 
-	ldw bpr, rg1, 8  // load op 2
+	ldw bpr, rg0, 8  // load arg
+    mov rg1, rg2
+    lwi 1, rg1
 
 start:
-    mov rg1, rg2
-    add rg1, rg2, acc
+    add rg1, rg2, rg3
 
     pusha 4
     push rg1
-    call print::print_hex_word
-    pop rg1
+    call print::print_hex_byte
+    call print::print_newline
+    pop zero
     popa 4
 
     mov rg2, rg1
-    mov acc, rg2
+    mov rg3, rg2
 
-    cmp rg0, zero
     dec rg0
-
+    cmp rg0, zero
     jgt start
 
     stw rg1, bpr, 8

resources/dsa/main.dsa

@@ -1,3 +1,7 @@
+include fib: "./lib/maths/fib.dsa" 
+include maths: "./lib/maths/core.dsa"
+include print: "./lib/io/print.dsa"
+
 dw idt: 0xFFFF0000
 dw stack: 0x10000
 init:
@@ -9,11 +13,59 @@ init:
 	ldw stack, bpr
 	mov bpr, spr
 
+dw string: "hello world"
 start:
-    lwi 10, rg0
+
+	lwi 37, rg0
+	lwi 12, rg1
 	push rg0
-    call maths::fib_n
+	push rg1
+	call maths::divmod
+	pop rg0 // result
+	pop rg1 // remainder
+
+	push rg1
+	push rg0
+	call print::print_hex_byte
+	call print::print_whitespace
 	pop zero
+	call print::print_hex_byte
+	call print::print_newline
+
+	lwi string, rg0
+    //lwi 10, rg0
+    pusha 4
+	push rg0
+	call print::print
+    //call fib::fib_n
+    pop zero
+	call print::print_newline
+	popa 4
+
+	pusha 4
+	push rg0
+	call print::print
+    //call fib::fib_n
+    pop zero
+	call print::print_newline
+	popa 4
+
+	pusha 4
+	push rg0
+	call print::print
+    //call fib::fib_n
+    pop zero
+	call print::print_newline
+	popa 4
+
+	pusha 4
+	push rg0
+	call print::print
+    //call fib::fib_n
+    pop zero
+	call print::print_newline
+	popa 4
+
     hlt
 
 // fault handler in case we fail DSA.

resources/dsa/testprint.dsa

@@ -64,9 +64,6 @@ start:
 	call print::print
 	pop zero
 
-	lli 3, rg0
-	ldw rg0, rg0
-
 	hlt