[Chaper 12] Fixed output

vulc41n · Jul 30, 2020 · 1c709d8 · 1c709d8
1 parent 94c9745
commit 1c709d8
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Showing 2 changed files with 6 additions and 5 deletions.
diff --git a/Chapter 12/debug.s b/Chapter 12/debug.s
@@ -10,11 +10,11 @@
 	mov	    r1, #\reg	
 	add	    r1, #'0'	@ for %c
 	ldr  	    r0, =ptfStr @ printf format str
-	mov	    r9, sp
-	str	    r1, [r9]
-	str	    r2, [r9, #8]
-	str	    r3, [r9, #16]
+	str	    r1, [sp, #-32]
+	str	    r2, [sp, #8]
+	str	    r3, [sp, #16]
 	bl	    _printf	@ call printf
+	add	    sp, sp, #32
 	pop	    {r0-r4, lr} @ restore regs
 .endm
 

diff --git a/Chapter 12/main.s b/Chapter 12/main.s
@@ -30,10 +30,11 @@ loop:	MOV	X0, X20		// move pointer to parameter 1 (X0)
 	FMOV	S2, W0		// move back to fpu for conversion
 	FCVT	D0, S2	// convert single to double
 	FMOV	X1, D0		// return double to X1
-	STR	X1, [SP]	// Push X1 onto the stack
+	STR	X1, [SP, #-16]!	// Push X1 onto the stack
 	ADRP	X0, prtstr@PAGE	// load print string
 	ADD	X0, X0, prtstr@PAGEOFF
 	BL	_printf		// print the distance
+	ADD	SP, SP, #16
 
 	ADD	X20, X20, #(4*4) 	// 4 points each 4 bytes
 	SUBS	W19, W19, #1	// decrement loop counter