85 lines
2.6 KiB
Plaintext
85 lines
2.6 KiB
Plaintext
/* ARM assembly Raspberry PI */
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/* program strcase.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 ARM assembly*/
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.include "../constantes.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 32 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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sBuffer1: .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 r0,iAdrszMessStart
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bl affichageMess
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ldr r1,iAdrszString
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ldr r3,iAdrsBuffer
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ldr r4,iAdrsBuffer1
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mov r6,#0b100000 @ 1 -> bit 5
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mov r2,#0
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1:
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ldrb r0,[r1,r2] @ load byte of string
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mov r5,r0
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cmp r0,#'A' @ select alpha characters lower or upper
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blt 3f
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cmp r0,#'z'
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bgt 3f
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cmp r0,#'Z'
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ble 2f
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cmp r0,#'a'
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bge 2f
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b 3f
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2:
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orr r0,r0,r6 @ converion in lower case (1 -> bit 5)
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bic r5,r0,r6 @ converion in upper case (0 -> bit 5)
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3:
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strb r0,[r3,r2] @ store lower character
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strb r5,[r4,r2] @ store upper character
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cmp r0,#0 @ end string ?
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add r2,r2,#1 @ increment index character
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bne 1b @ loop
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ldr r0,iAdrszMessResult
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bl affichageMess
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ldr r0,iAdrsBuffer
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bl affichageMess
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ldr r0,iAdrszCarriageReturn
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bl affichageMess
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ldr r0,iAdrsBuffer1
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bl affichageMess
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ldr r0,iAdrszCarriageReturn
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bl affichageMess
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100: @ standard end of the program
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mov r0, #0 @ return code
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mov r7, #EXIT @ request to exit program
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swi 0 @ perform the system call
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iAdrszString: .int szString
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iAdrsBuffer: .int sBuffer
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iAdrsBuffer1: .int sBuffer1
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iAdrszMessResult: .int szMessResult
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iAdrszCarriageReturn: .int szCarriageReturn
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iAdrszMessStart: .int 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 ARM assembly*/
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.include "../affichage.inc"
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