[Chapter 13] Most importantly: Fixed distance. Also, made makefile nicer

Chapter 13/main.s

@@ -5,6 +5,7 @@
 // X20 - address to current set of points
 
 .global main // Provide program starting address to linker
+.align 4
 
 //
 
@@ -14,7 +15,8 @@ main:
 	STP	X19, X20, [SP, #-16]!
 	STR	LR, [SP, #-16]!
 
-	LDR	X20, =points	// pointer to current points
+	ADRP	X20, points@PAGE	// pointer to current points
+	ADD	X20, X20, points@PAGEOFF
 
 	MOV	W19, #N		// number of loop iterations
 
@@ -28,9 +30,11 @@ loop:	MOV	X0, X20		// move pointer to parameter 1 (r0)
 	FMOV	S2, W0		// move back to fpu for conversion
 	FCVT	D0, S2	// convert single to double
 	FMOV	X1, D0	// return double to r2, r3
+	STR	X1, [SP, #-16]!
 	ADRP	X0, prtstr@PAGE	// load print string
 	ADD	X0, X0, prtstr@PAGEOFF
 	BL	_printf		// print the distance
+	ADD	SP, SP, #16
 
 	ADD	X20, X20, #(8*4) // 8 elements each 4 bytes
 	SUBS	W19, W19, #1	// decrement loop counter

Chapter 13/makefile

@@ -5,16 +5,16 @@ else
 DEBUGFLGS =
 endif
 
-LDFLAGS = -lc -e main
+CFLAGS = -lc -e main
 
 all: distance matrixmultneon
 
 %.o : %.s
 	as $(DEBUGFLGS) $(LSTFLGS) $< -o $@
 
 distance: distance.s main.s
-	clang $(LDFLAGS) -g -o distance distance.s main.s
+	clang $(CFLAGS) $(DEBUGFLGS) -o distance distance.s main.s
 
 matrixmultneon: matrixmultneon.s
-	clang $(LDFLAGS) -g -o matrixmultneon matrixmultneon.s
+	clang $(CFLAGS) $(DEBUGFLGS) -o matrixmultneon matrixmultneon.s