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Ingy döt Net
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/* ARM assembly Raspberry PI */
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/* program insertString.s */
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/* REMARK 1 : this program use routines in a include file
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see task Include a file language arm assembly
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for the routine affichageMess conversion10
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see at end of this program the instruction include */
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/*******************************************/
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/* Constantes */
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/*******************************************/
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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 BRK, 0x2d @ Linux syscall
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.equ CHARPOS, '@'
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/*******************************************/
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/* Initialized data */
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/*******************************************/
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.data
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szString: .asciz " string "
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szString1: .asciz "insert"
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szString2: .asciz "abcd@efg"
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szString3: .asciz "abcdef @"
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szString4: .asciz "@ abcdef"
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szCarriageReturn: .asciz "\n"
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/*******************************************/
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/* UnInitialized data */
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/*******************************************/
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.bss
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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,iAdrszString // string address
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ldr r1,iAdrszString1 // string address
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mov r2,#0
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bl strInsert //
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// return new pointer
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bl affichageMess // display result string
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ldr r0,iAdrszCarriageReturn
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bl affichageMess
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ldr r0,iAdrszString // string address
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ldr r1,iAdrszString1 // string address
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mov r2,#3
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bl strInsert //
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// return new pointer
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bl affichageMess // display result string
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ldr r0,iAdrszCarriageReturn
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bl affichageMess
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ldr r0,iAdrszString // string address
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ldr r1,iAdrszString1 // string address
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mov r2,#40
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bl strInsert //
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// return new pointer
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bl affichageMess // display result string
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ldr r0,iAdrszCarriageReturn
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bl affichageMess
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ldr r0,iAdrszString2 // string address
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ldr r1,iAdrszString1 // string address
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bl strInsertAtChar //
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// return new pointer
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bl affichageMess // display result string
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ldr r0,iAdrszCarriageReturn
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bl affichageMess
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ldr r0,iAdrszString3 // string address
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ldr r1,iAdrszString1 // string address
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bl strInsertAtChar //
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// return new pointer
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bl affichageMess // display result string
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ldr r0,iAdrszCarriageReturn
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bl affichageMess
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ldr r0,iAdrszString4 // string address
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ldr r1,iAdrszString1 // string address
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bl strInsertAtChar //
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// return new pointer
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bl affichageMess // display result string
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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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svc 0 // perform the system call
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iAdrszString: .int szString
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iAdrszString1: .int szString1
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iAdrszString2: .int szString2
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iAdrszString3: .int szString3
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iAdrszString4: .int szString4
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iAdrszCarriageReturn: .int szCarriageReturn
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/******************************************************************/
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/* insertion of a sub-chain in a chain in the desired position */
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/******************************************************************/
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/* r0 contains the address of string 1 */
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/* r1 contains the address of string to insert */
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/* r2 contains the position of insertion :
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0 start string
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if r2 > lenght string 1 insert at end of string*/
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/* r0 return the address of new string on the heap */
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strInsert:
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push {r1-r4,lr} @ save registres
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mov r3,#0 // length counter
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1: // compute length of string 1
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ldrb r4,[r0,r3]
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cmp r4,#0
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addne r3,r3,#1 // increment to one if not equal
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bne 1b // loop if not equal
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mov r5,#0 // length counter insertion string
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2: // compute length of insertion string
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ldrb r4,[r1,r5]
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cmp r4,#0
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addne r5,r5,#1 // increment to one if not equal
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bne 2b
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cmp r5,#0
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beq 99f // string empty -> error
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add r3,r3,r5 // add 2 length
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add r3,r3,#1 // +1 for final zero
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mov r6,r0 // save address string 1
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mov r0,#0 // allocation place heap
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mov r7,#BRK // call system 'brk'
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svc #0
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mov r5,r0 // save address heap for output string
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add r0,r0,r3 // reservation place r3 length
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mov r7,#BRK // call system 'brk'
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svc #0
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cmp r0,#-1 // allocation error
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beq 99f
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//
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mov r7,#0 // index load characters string 1
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cmp r2,#0 // index insertion = 0
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beq 5f // insertion at string 1 begin
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3: // loop copy characters string 1
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ldrb r0,[r6,r7] // load character
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cmp r0,#0 // end string ?
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beq 5f // insertion at end
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strb r0,[r5,r7] // store character in output string
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add r7,r7,#1 // increment index
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cmp r7,r2 // < insertion index ?
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blt 3b // yes -> loop
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5:
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mov r4,r7 // init index character output string
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mov r3,#0 // index load characters insertion string
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6:
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ldrb r0,[r1,r3] // load characters insertion string
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cmp r0,#0 // end string ?
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beq 7f
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strb r0,[r5,r4] // store in output string
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add r3,r3,#1 // increment index
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add r4,r4,#1 // increment output index
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b 6b // and loop
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7:
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ldrb r0,[r6,r7] // load other character string 1
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strb r0,[r5,r4] // store in output string
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cmp r0,#0 // end string 1 ?
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beq 8f // yes -> end
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add r4,r4,#1 // increment output index
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add r7,r7,#1 // increment index
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b 7b // and loop
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8:
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mov r0,r5 // return output string address
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b 100f
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99: // error
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mov r0,#-1
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100:
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pop {r1-r4,lr} @ restaur registers
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bx lr @ return
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/******************************************************************/
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/* insert string at character insertion */
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/******************************************************************/
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/* r0 contains the address of string 1 */
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/* r1 contains the address of insertion string */
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/* r0 return the address of new string on the heap */
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/* or -1 if error */
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strInsertAtChar:
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push {r1-r7,lr} @ save registres
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mov r3,#0 // length counter
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1: // compute length of string 1
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ldrb r4,[r0,r3]
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cmp r4,#0
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addne r3,r3,#1 // increment to one if not equal
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bne 1b // loop if not equal
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mov r5,#0 // length counter insertion string
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2: // compute length to insertion string
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ldrb r4,[r1,r5]
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cmp r4,#0
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addne r5,r5,#1 // increment to one if not equal
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bne 2b // and loop
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cmp r5,#0
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beq 99f // string empty -> error
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add r3,r3,r5 // add 2 length
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add r3,r3,#1 // +1 for final zero
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mov r6,r0 // save address string 1
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mov r0,#0 // allocation place heap
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mov r7,#BRK // call system 'brk'
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svc #0
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mov r5,r0 // save address heap for output string
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add r0,r0,r3 // reservation place r3 length
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mov r7,#BRK // call system 'brk'
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svc #0
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cmp r0,#-1 // allocation error
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beq 99f
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mov r2,#0
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mov r4,#0
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3: // loop copy string begin
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ldrb r3,[r6,r2]
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cmp r3,#0
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beq 99f
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cmp r3,#CHARPOS // insertion character ?
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beq 5f // yes
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strb r3,[r5,r4] // no store character in output string
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add r2,r2,#1
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add r4,r4,#1
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b 3b // and loop
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5: // r4 contains position insertion
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add r7,r4,#1 // init index character output string
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// at position insertion + one
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mov r3,#0 // index load characters insertion string
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6:
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ldrb r0,[r1,r3] // load characters insertion string
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cmp r0,#0 // end string ?
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beq 7f // yes
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strb r0,[r5,r4] // store in output string
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add r3,r3,#1 // increment index
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add r4,r4,#1 // increment output index
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b 6b // and loop
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7: // loop copy end string
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ldrb r0,[r6,r7] // load other character string 1
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strb r0,[r5,r4] // store in output string
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cmp r0,#0 // end string 1 ?
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beq 8f // yes -> end
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add r4,r4,#1 // increment output index
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add r7,r7,#1 // increment index
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b 7b // and loop
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8:
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mov r0,r5 // return output string address
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b 100f
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99: // error
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mov r0,#-1
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100:
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pop {r1-r7,lr} @ restaur registers
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bx lr @ return
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/***************************************************/
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/* ROUTINES INCLUDE */
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/***************************************************/
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.include "../affichage.inc"
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