mainmacro.s

//
// Assembler program to convert a string to
// all upper case by calling a function.
//
// X0-X2 - parameters to linux function services
// X1 - address of output string
// X0 - address of input string
// X2 - original address of input string
// X8 - linux function number
//

.include "uppermacro.s"

.global _start	            // Provide program starting address to linker
.align 4

_start:
	// Convert tststr to uppercase
	toupper tststr, buffer

// Setup the parameters to print
// and then call the kernel to do it.
	MOV	X2,X0	// return code is the length of the string

	MOV	X0, #1	    // 1 = StdOut
	ADRP	X1, buffer@PAGE // string to print
	ADD X1, X1, buffer@PAGEOFF
	MOV	X16, #4	    // Unix write system call
	SVC	#0x80 	    // Call kernel to output the string

	// Convert tststr2 to uppercase
	toupper tststr2, buffer

// Setup the parameters to print
// and then call the kernel to do it.
	MOV	X2,X0	// return code is the length of the string

	MOV	X0, #1	    // 1 = StdOut
	ADRP	X1, buffer@PAGE // string to print
	ADD X1, X1, buffer@PAGEOFF
	MOV	X16, #4	    // Unix write system call
	SVC	#0x80 	    // Call kernel to output the string

// Setup the parameters to exit the program
// and then call the kernel to do it.
	MOV     X0, #0		// Use 0 return code
	MOV     X16, #1		// System call number 1 terminates this program
	SVC     #0x80		// Call kernel to terminate the program

.data
tststr:  .asciz  "This is our Test String that we will convert.\n"
tststr2: .asciz	 "A second string to upper case!!\n"
buffer:	.fill	255, 1, 0