135 lines
4.7 KiB
Plaintext
135 lines
4.7 KiB
Plaintext
/* ARM assembly Raspberry PI */
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/* program logicoper.s */
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/* Constantes */
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.equ STDOUT, 1
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.equ WRITE, 4
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.equ EXIT, 1
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/* Initialized data */
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.data
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szMessResultAnd: .asciz "Result of And : \n"
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szMessResultOr: .asciz "Result of Or : \n"
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szMessResultEor: .asciz "Result of Exclusive Or : \n"
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szMessResultNot: .asciz "Result of Not : \n"
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szMessResultClear: .asciz "Result of Bit Clear : \n"
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sMessAffBin: .ascii "Register value : "
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sZoneBin: .space 36,' '
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.asciz "\n"
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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} /* save 2 registers */
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mov r0,#0b1100 @ binary value 1
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mov r1,#0b0110 @ binary value 2
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bl logicfunc
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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} @ restore 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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/******************************************************************/
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/* logics functions */
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/******************************************************************/
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/* r0 contains the first value */
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/* r1 contains the second value */
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logicfunc:
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push {r2,lr} @ save registers
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mov r2,r0 @ save value 1 in r2
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ldr r0,iAdrszMessResultAnd @ and
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bl affichageMess
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mov r0,r2 @ load value 1 in r0
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and r0,r1
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bl affichage2
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ldr r0,iAdrszMessResultOr @ or
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bl affichageMess
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mov r0,r2
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orr r0,r1
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bl affichage2
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ldr r0,iAdrszMessResultEor @ exclusive or
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bl affichageMess
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mov r0,r2
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eor r0,r1
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bl affichage2
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ldr r0,iAdrszMessResultNot @ not
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bl affichageMess
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mov r0,r2
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mvn r0,r1
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bl affichage2
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ldr r0,iAdrszMessResultClear @ bit clear
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bl affichageMess
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mov r0,r2
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bic r0,r1
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bl affichage2
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100:
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pop {r2,lr} @ restore registers
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bx lr
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iAdrszMessResultAnd: .int szMessResultAnd
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iAdrszMessResultOr: .int szMessResultOr
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iAdrszMessResultEor: .int szMessResultEor
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iAdrszMessResultNot: .int szMessResultNot
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iAdrszMessResultClear: .int szMessResultClear
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/******************************************************************/
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/* register display in binary */
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/******************************************************************/
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/* r0 contains the register */
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affichage2:
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push {r0,lr} /* save registers */
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push {r1-r5} /* save other registers */
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mrs r5,cpsr /* saves state register in r5 */
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ldr r1,iAdrsZoneBin
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mov r2,#0 @ read bit position counter
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mov r3,#0 @ position counter of the written character
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1: @ loop
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lsls r0,#1 @ left shift with flags
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movcc r4,#48 @ flag carry off character '0'
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movcs r4,#49 @ flag carry on character '1'
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strb r4,[r1,r3] @ character -> display zone
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add r2,r2,#1 @ + 1 read bit position counter
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add r3,r3,#1 @ + 1 position counter of the written character
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cmp r2,#8 @ 8 bits read
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addeq r3,r3,#1 @ + 1 position counter of the written character
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cmp r2,#16 @ etc
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addeq r3,r3,#1
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cmp r2,#24
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addeq r3,r3,#1
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cmp r2,#31 @ 32 bits shifted ?
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ble 1b @ no -> loop
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ldr r0,iAdrsZoneMessBin @ address of message result
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bl affichageMess @ display result
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100:
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msr cpsr,r5 /* restore state register */
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pop {r1-r5} /* restore other registers */
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pop {r0,lr}
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bx lr
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iAdrsZoneBin: .int sZoneBin
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iAdrsZoneMessBin: .int sMessAffBin
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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 registers */
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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 byte start position + index */
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cmp r1,#0 /* if 0 it's over */
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addne r2,r2,#1 /* else add 1 to 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 */
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mov r7,#WRITE /* "write" system call */
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swi #0 /* system call */
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pop {r0,r1,r2,r7} /* restore other registers */
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pop {fp,lr} /* restore 2 registers */
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bx lr /* return */
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