85 lines
2.7 KiB
Plaintext
85 lines
2.7 KiB
Plaintext
/* ARM assembly AARCH64 Raspberry PI 3B */
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/* program strcase64.s */
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/************************************/
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/* Constantes */
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/************************************/
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/* for this file see task include a file in language AArch64 assembly*/
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.include "../includeConstantesARM64.inc"
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/************************************/
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/* Initialized data */
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/************************************/
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.data
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szMessResult: .asciz "Result: \n"
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szString: .asciz "alphaBETA"
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szCarriageReturn: .asciz "\n"
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szMessStart: .asciz "Program 64 bits start.\n"
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/************************************/
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/* UnInitialized data */
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/************************************/
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.bss
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sBuffer: .skip 80
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sBuffex1: .skip 80
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/************************************/
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/* code section */
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/************************************/
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.text
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.global main
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main: // entry of program
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ldr x0,qAdrszMessStart
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bl affichageMess
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ldr x1,qAdrszString
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ldr x3,qAdrsBuffer
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ldr x4,qAdrsBuffex1
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mov x6,#0b100000 // 1 -> bit 5
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mov x2,#0
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1:
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ldrb w0,[x1,x2] // load byte of string
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mov x5,x0
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cmp x0,#'A' // select alpha characters lower or upper
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blt 3f
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cmp x0,#'z'
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bgt 3f
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cmp x0,#'Z'
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ble 2f
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cmp x0,#'a'
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bge 2f
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b 3f
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2:
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orr x0,x0,x6 // converion in lower case (1 -> bit 5)
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bic x5,x0,x6 // converion in upper case (0 -> bit 5)
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3:
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strb w0,[x3,x2] // store lower character
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strb w5,[x4,x2] // store upper character
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cmp x0,#0 // end string ?
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add x2,x2,#1 // increment index character
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bne 1b // loop
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ldr x0,qAdrszMessResult
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bl affichageMess
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ldr x0,qAdrsBuffer
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bl affichageMess
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ldr x0,qAdrszCarriageReturn
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bl affichageMess
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ldr x0,qAdrsBuffex1
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bl affichageMess
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ldr x0,qAdrszCarriageReturn
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bl affichageMess
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100: // standard end of the program
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mov x0, #0 // return code
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mov x8, #EXIT // request to exit program
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svc 0 // perform the system call
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qAdrszString: .quad szString
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qAdrsBuffer: .quad sBuffer
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qAdrsBuffex1: .quad sBuffex1
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qAdrszMessResult: .quad szMessResult
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qAdrszCarriageReturn: .quad szCarriageReturn
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qAdrszMessStart: .quad szMessStart
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/***************************************************/
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/* ROUTINES INCLUDE */
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/***************************************************/
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/* for this file see task include a file in language AArch64 assembly*/
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.include "../includeARM64.inc"
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