123 lines
3.7 KiB
Text
123 lines
3.7 KiB
Text
/* ARM assembly Raspberry PI */
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/* program verifFic.s */
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/* Constantes */
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.equ STDOUT, 1 @ Linux output console
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.equ EXIT, 1 @ Linux syscall
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.equ WRITE, 4 @ Linux syscall
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.equ OPEN, 5 @ Linux syscall
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.equ CLOSE, 6 @ Linux syscall
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.equ O_RDWR, 0x0002 /* open for reading and writing */
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/*******************************************/
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/* Fichier des macros */
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/********************************************/
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.include "../../ficmacros.s"
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/* Initialized data */
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.data
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szMessFound1: .asciz "File 1 found.\n"
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szMessFound2: .asciz "File 2 found.\n"
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szMessNotFound1: .asciz "File 1 not found.\n"
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szMessNotFound2: .asciz "File 2 not found.\n"
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szMessNotAuth2: .asciz "File 2 permission denied.\n"
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szCarriageReturn: .asciz "\n"
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/* areas strings */
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szFicName1: .asciz "test1.txt"
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szFicName2: .asciz "/debian-binary"
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/* UnInitialized data */
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.bss
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/* code section */
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.text
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.global main
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main: /* entry of program */
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push {fp,lr} /* saves 2 registers */
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/*************************************
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open file 1
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************************************/
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ldr r0,iAdrszFicName1 @ file name
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mov r1,#O_RDWR @ flags
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mov r2,#0 @ mode
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mov r7, #OPEN @ call system OPEN
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swi 0
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cmp r0,#0 @ error ?
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ble 1f
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mov r1,r0 @ FD
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ldr r0,iAdrszMessFound1
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bl affichageMess
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@ close file
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mov r0,r1 @ Fd
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mov r7, #CLOSE
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swi 0
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b 2f
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1:
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ldr r0,iAdrszMessNotFound1
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bl affichageMess
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2:
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/*************************************
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open file 2
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************************************/
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ldr r0,iAdrszFicName2 @ file name
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mov r1,#O_RDWR @ flags
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mov r2,#0 @ mode
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mov r7, #OPEN @ call system OPEN
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swi 0
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vidregtit verif
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cmp r0,#-13 @ permission denied
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beq 4f
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cmp r0,#0 @ error ?
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ble 3f
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mov r1,r0 @ FD
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ldr r0,iAdrszMessFound2
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bl affichageMess
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@ close file
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mov r0,r1 @ Fd
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mov r7, #CLOSE
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swi 0
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b 100f
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3:
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ldr r0,iAdrszMessNotFound2
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bl affichageMess
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b 100f
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4:
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ldr r0,iAdrszMessNotAuth2
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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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pop {fp,lr} @restaur 2 registers
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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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iAdrszFicName1: .int szFicName1
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iAdrszFicName2: .int szFicName2
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iAdrszMessFound1: .int szMessFound1
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iAdrszMessFound2: .int szMessFound2
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iAdrszMessNotFound1: .int szMessNotFound1
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iAdrszMessNotFound2: .int szMessNotFound2
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iAdrszMessNotAuth2: .int szMessNotAuth2
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/******************************************************************/
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/* display text with size calculation */
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/******************************************************************/
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/* r0 contains the address of the message */
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affichageMess:
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push {fp,lr} /* save registres */
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push {r0,r1,r2,r7} /* save others registers */
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mov r2,#0 /* counter length */
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1: /* loop length calculation */
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ldrb r1,[r0,r2] /* read octet start position + index */
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cmp r1,#0 /* if 0 its over */
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addne r2,r2,#1 /* else add 1 in the length */
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bne 1b /* and loop */
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/* so here r2 contains the length of the message */
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mov r1,r0 /* address message in r1 */
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mov r0,#STDOUT /* code to write to the standard output Linux */
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mov r7, #WRITE /* code call system "write" */
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swi #0 /* call systeme */
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pop {r0,r1,r2,r7} /* restaur others registers */
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pop {fp,lr} /* restaur des 2 registres */
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bx lr /* return */
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