149 lines
4.7 KiB
Plaintext
149 lines
4.7 KiB
Plaintext
/* ARM assembly Raspberry PI */
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/* program condstr.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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szMessTest1: .asciz "The test 1 is equal.\n"
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szMessTest1N: .asciz "The test 1 is not equal.\n"
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szMessTest2: .asciz "The test 2 is equal.\n"
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szMessTest2N: .asciz "The test 2 is not equal.\n"
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szMessTest3: .asciz "The test 3 is <.\n"
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szMessTest3N: .asciz "The test 3 is >.\n"
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szMessTest4: .asciz "The test 4 is <=.\n"
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szMessTest4N: .asciz "The test 4 is >.\n"
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szMessTest5: .asciz "The test 5 is negative.\n"
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szMessTest5N: .asciz "The test 5 is positive ou equal 0.\n"
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szMessTest6: .asciz "Test 6 : carry is off.\n"
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szMessTest6N: .asciz "Test 6 : carry is set.\n"
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szMessTest7: .asciz "Test 7 : no overflow.\n"
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szMessTest7N: .asciz "Test 7 : overflow.\n"
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szMessTest8: .asciz "Test 8 : then.\n"
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szMessTest8N: .asciz "Test 8 : else.\n"
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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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@ test equal zero, not equal zero
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@movs r1,#0 @ comments
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movs r1,#1 @ @ s --> flags and uncomments
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ldreq r0,iAdrszMessTest1
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ldrne r0,iAdrszMessTest1N
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bl affichageMess
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@ test equal 5, not equal 5
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@mov r1,#5
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mov r1,#10
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cmp r1,#5
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ldreq r0,iAdrszMessTest2
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ldrne r0,iAdrszMessTest2N
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bl affichageMess
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@ test < 5, > 5 SIGNED
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mov r1,#-10
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@mov r1,#10
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cmp r1,#5
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ldrlt r0,iAdrszMessTest3
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ldrgt r0,iAdrszMessTest3N
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bl affichageMess
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@ test < 5, > 5 UNSIGNED
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@mov r1,#-10
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mov r1,#2
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cmp r1,#5
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ldrls r0,iAdrszMessTest4
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ldrhi r0,iAdrszMessTest4N
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bl affichageMess
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@ test < 0, > 0
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@movs r1,#-10
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movs r1,#2 @ s --> flags
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ldrmi r0,iAdrszMessTest5
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ldrpl r0,iAdrszMessTest5N
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bl affichageMess
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@ carry off carry on
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@mov r1,#-10 @ for carry set
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@mov r1,#10 @ for carry off
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mov r1,#(2<<30) - 1 @ for carry off
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adds r1,#20 @ s --> flags
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ldrcc r0,iAdrszMessTest6 @ carry clear
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ldrcs r0,iAdrszMessTest6N @ carry set
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bl affichageMess
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@ overflow off overflow on
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@mov r1,#-10 @ for not overflow
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@mov r1,#10 @ for not overflow
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mov r1,#(2<<30) - 1 @ for overflow
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adds r1,#20 @ s --> flags
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ldrvc r0,iAdrszMessTest7 @ overflow off
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ldrvs r0,iAdrszMessTest7N @ overflow on
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bl affichageMess
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@ other if then else
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mov r1,#5 @ for then
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@mov r1,#20 @ for else
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cmp r1,#10
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ble 1f @ less or equal
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@bge 1f @ greather or equal
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@else
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ldr r0,iAdrszMessTest8N @ overflow off
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bl affichageMess
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b 2f
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1: @ then
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ldr r0,iAdrszMessTest8 @ overflow off
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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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iAdrszMessTest1: .int szMessTest1
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iAdrszMessTest1N: .int szMessTest1N
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iAdrszMessTest2: .int szMessTest2
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iAdrszMessTest2N: .int szMessTest2N
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iAdrszMessTest3: .int szMessTest3
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iAdrszMessTest3N: .int szMessTest3N
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iAdrszMessTest4: .int szMessTest4
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iAdrszMessTest4N: .int szMessTest4N
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iAdrszMessTest5: .int szMessTest5
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iAdrszMessTest5N: .int szMessTest5N
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iAdrszMessTest6: .int szMessTest6
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iAdrszMessTest6N: .int szMessTest6N
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iAdrszMessTest7: .int szMessTest7
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iAdrszMessTest7N: .int szMessTest7N
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iAdrszMessTest8: .int szMessTest8
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iAdrszMessTest8N: .int szMessTest8N
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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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