127 lines
4.2 KiB
Plaintext
127 lines
4.2 KiB
Plaintext
/* ARM assembly Raspberry PI */
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/* program createDirFic.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 exit Program
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.equ WRITE, 4 @ Linux syscall write FILE
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.equ MKDIR, 0x27 @ Linux Syscal create directory
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.equ CHGDIR, 0xC @ Linux Syscal change directory
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.equ CREATE, 0x8 @ Linux Syscal create file
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.equ CLOSE, 0x6 @ Linux Syscal close file
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/* Initialized data */
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.data
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szMessCreateDirOk: .asciz "Create directory Ok.\n"
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szMessErrCreateDir: .asciz "Unable create directory. \n"
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szMessErrChangeDir: .asciz "Unable change directory. \n"
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szMessCreateFileOk: .asciz "Create file Ok.\n"
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szMessErrCreateFile: .asciz "Unable create file. \n"
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szMessErrCloseFile: .asciz "Unable close file. \n"
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szNameDir: .asciz "Dir1"
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szNameFile: .asciz "file1.txt"
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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 registers
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@ create directory
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ldr r0,iAdrszNameDir @ directory name
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mov r1,#0775 @ mode (in octal zero is important !!)
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mov r7, #MKDIR @ code call system create directory
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swi #0 @ call systeme
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cmp r0,#0 @ error ?
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bne 99f
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@ display message ok directory
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ldr r0,iAdrszMessCreateDirOk
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bl affichageMess
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@ change directory
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ldr r0,iAdrszNameDir @ directory name
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mov r7, #CHGDIR @ code call system change directory
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swi #0 @ call systeme
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cmp r0,#0 @ error ?
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bne 98f
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@ create file
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ldr r0,iAdrszNameFile @ directory name
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mov r1,#0755 @ mode (in octal zero is important !!)
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mov r2,#0
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mov r7,#CREATE @ code call system create file
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swi #0 @ call systeme
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cmp r0,#0 @ error ?
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ble 97f
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mov r8,r0 @ save File Descriptor
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@ display message ok file
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ldr r0,iAdrszMessCreateFileOk
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bl affichageMess
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@ close file
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mov r0,r8 @ Fd
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mov r7, #CLOSE @ close file
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swi 0
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cmp r0,#0
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bne 96f
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@ end Ok
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b 100f
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96:
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@ display error message close file
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ldr r0,iAdrszMessErrCloseFile
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bl affichageMess
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b 100f
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97:
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@ display error message create file
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ldr r0,iAdrszMessErrCreateFile
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bl affichageMess
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b 100f
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98:
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@ display error message change directory
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ldr r0,iAdrszMessErrChangeDir
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bl affichageMess
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b 100f
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99:
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@ display error message create directory
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ldr r0,iAdrszMessErrCreateDir
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bl affichageMess
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b 100f
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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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iAdrszMessCreateDirOk: .int szMessCreateDirOk
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iAdrszMessErrCreateDir: .int szMessErrCreateDir
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iAdrszMessErrChangeDir: .int szMessErrChangeDir
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iAdrszMessCreateFileOk: .int szMessCreateFileOk
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iAdrszNameFile: .int szNameFile
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iAdrszMessErrCreateFile: .int szMessErrCreateFile
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iAdrszMessErrCloseFile: .int szMessErrCloseFile
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iAdrszNameDir: .int szNameDir
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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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