fix: debug format string

The current format string's conversion specifier %c and
x1 with '0' added to it do not properly handle cases where reg is x10 to x30.
This takes the value passed to x1 as an integer and processes it with the
conversion specifier %u.

Author: rosshjb

Chapter 09/debug.s

@@ -14,10 +14,9 @@
 	stp	    X14, X15, [SP, #-16]!	
 	stp	    X16, X17, [SP, #-16]!	
 	stp	    X18, LR, [SP, #-16]!	
+	mov	    X1, #\reg	// for the %u
 	mov	    X2, X\reg	// for the %d
 	mov	    X3, X\reg	// for the %x
-	mov	    X1, #\reg	
-	add	    X1, X1, #'0'	// for %c
     str     X1, [SP, #-32]! // Move the stack pointer four doublewords (32 bytes) down and push X1 onto the stack
     str     X2, [SP, #8]    // Push X2 to one doubleword above the current stack pointer
     str     X3, [SP, #16]   // Push X3 to two doublewords above the current stack pointer
@@ -67,6 +66,6 @@
 .endm
 
 .data
-ptfStr: .asciz	"X%c = %32ld, 0x%016lx\n"
+ptfStr: .asciz	"X%-2u = %32ld, 0x%016lx\n"
 .align 4
 .text

Chapter 11/debug.s

@@ -14,10 +14,9 @@
 	stp	    X14, X15, [SP, #-16]!	
 	stp	    X16, X17, [SP, #-16]!	
 	stp	    X18, LR, [SP, #-16]!	
+	mov	    X1, #\reg	// for the %c
 	mov	    X2, X\reg	// for the %d
 	mov	    X3, X\reg	// for the %x
-	mov	    X1, #\reg	
-	add	    X1, X1, #'0'	// for %c
     str     X1, [SP, #-32]! // Move the stack pointer four doublewords (32 bytes) down and push X1 onto the stack
     str     X2, [SP, #8]    // Push X2 to one doubleword above the current stack pointer
     str     X3, [SP, #16]   // Push X3 to two doublewords above the current stack pointer
@@ -67,6 +66,6 @@
 .endm
 
 .data
-ptfStr: .asciz	"X%c = %32ld, 0x%016lx\n"
+ptfStr: .asciz	"X%-2u = %32ld, 0x%016lx\n"
 .align 4
 .text