YAPC::EU 2018 Glasgow Update!
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Ingy döt Net
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1170 changed files with 15042 additions and 3047 deletions
179
Task/String-comparison/ARM-Assembly/string-comparison.arm
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179
Task/String-comparison/ARM-Assembly/string-comparison.arm
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/* ARM assembly Raspberry PI */
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/* program comparString.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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/* Initialized data */
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.data
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szMessStringEqu: .asciz "The strings are equals.\n"
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szMessStringNotEqu: .asciz "The strings are not equals.\n"
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szCarriageReturn: .asciz "\n"
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szString1: .asciz "ABCDE"
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szString2: .asciz "ABCDE"
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szString3: .asciz "ABCFG"
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szString4: .asciz "ABC"
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szString5: .asciz "abcde"
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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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ldr r0,iAdrszString1
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ldr r1,iAdrszString2
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bl Comparaison
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ldr r0,iAdrszString1
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ldr r1,iAdrszString3
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bl Comparaison
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ldr r0,iAdrszString1
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ldr r1,iAdrszString4
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bl Comparaison
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@ case sensitive comparisons ABCDE et abcde
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ldr r0,iAdrszString1
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ldr r1,iAdrszString5
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bl Comparaison
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@ case insensitive comparisons ABCDE et abcde
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ldr r0,iAdrszString1
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ldr r1,iAdrszString5
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bl comparStringsInsensitive
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cmp r0,#0
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bne 1f
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ldr r0,iAdrszMessStringEqu
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bl affichageMess
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b 2f
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1:
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ldr r0,iAdrszMessStringNotEqu
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bl affichageMess
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2:
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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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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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iAdrszString5: .int szString5
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iAdrszMessStringEqu: .int szMessStringEqu
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iAdrszMessStringNotEqu: .int szMessStringNotEqu
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iAdrszCarriageReturn: .int szCarriageReturn
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/*********************************************/
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/* comparaison */
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/*********************************************/
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/* r0 contains address String 1 */
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/* r1 contains address String 2 */
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Comparaison:
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push {fp,lr} /* save registres */
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bl comparStrings
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cmp r0,#0
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bne 1f
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ldr r0,iAdrszMessStringEqu
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bl affichageMess
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b 2f
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1:
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ldr r0,iAdrszMessStringNotEqu
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bl affichageMess
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2:
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pop {fp,lr} /* restaur des 2 registres */
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bx lr /* return */
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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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/************************************/
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/* Strings case sensitive comparisons */
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/************************************/
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/* r0 et r1 contains the address of strings */
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/* return 0 in r0 if equals */
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/* return -1 if string r0 < string r1 */
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/* return 1 if string r0 > string r1 */
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comparStrings:
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push {r1-r4} /* save des registres */
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mov r2,#0 /* counter */
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1:
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ldrb r3,[r0,r2] /* byte string 1 */
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ldrb r4,[r1,r2] /* byte string 2 */
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cmp r3,r4
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movlt r0,#-1 /* small */
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movgt r0,#1 /* greather */
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bne 100f /* not equals */
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cmp r3,#0 /* 0 end string */
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moveq r0,#0 /* equals */
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beq 100f /* end string */
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add r2,r2,#1 /* else add 1 in counter */
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b 1b /* and loop */
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100:
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pop {r1-r4}
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bx lr
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/************************************/
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/* Strings case insensitive comparisons */
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/************************************/
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/* r0 et r1 contains the address of strings */
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/* return 0 in r0 if equals */
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/* return -1 if string r0 < string r1 */
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/* return 1 if string r0 > string r1 */
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comparStringsInsensitive:
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push {r1-r4} /* save des registres */
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mov r2,#0 /* counter */
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1:
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ldrb r3,[r0,r2] /* byte string 1 */
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ldrb r4,[r1,r2] /* byte string 2 */
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@ majuscules --> minuscules byte 1
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cmp r3,#65
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blt 2f
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cmp r3,#90
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bgt 2f
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add r3,#32
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2: @ majuscules --> minuscules byte 2
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cmp r4,#65
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blt 3f
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cmp r4,#90
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bgt 3f
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add r4,#32
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3:
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cmp r3,r4
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movlt r0,#-1 /* small */
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movgt r0,#1 /* greather */
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bne 100f /* not equals */
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cmp r3,#0 /* 0 end string */
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moveq r0,#0 /* equal */
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beq 100f /* end strings */
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add r2,r2,#1 /* else add 1 in counter */
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b 1b /* and loop */
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100:
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pop {r1-r4}
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bx lr /* end procedure */
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