/* Programme assembleur ARM Raspberry */ /* modèle B 512MO */ /* REMARK 1 : this program use routines in a include file see task Include a file language arm assembly for the routine affichageMess conversion10 see at end of this program the instruction include */ /************************************/ /* Constantes */ /************************************/ .equ STDIN, 0 @ Linux input console .equ STDOUT, 1 @ Linux output console .equ EXIT, 1 @ Linux syscall .equ READ, 3 @ Linux syscall .equ WRITE, 4 @ Linux syscall .equ IOCTL, 0x36 @ Linux syscall .equ SIGACTION, 0x43 @ Linux syscall .equ SYSPOLL, 0xA8 @ Linux syscall .equ TCGETS, 0x5401 .equ TCSETS, 0x5402 .equ ICANON, 2 .equ ECHO, 10 .equ POLLIN, 1 .equ SIGINT, 2 @ Issued if the user sends an interrupt signal (Ctrl + C) .equ SIGQUIT, 3 @ Issued if the user sends a quit signal (Ctrl + D) .equ SIGTERM, 15 @ Software termination signal (sent by kill by default) .equ SIGTTOU, 22 @ .equ BUFSIZE, 80 /*******************************************/ /* Structures */ /********************************************/ /* structure termios see doc linux*/ .struct 0 term_c_iflag: @ input modes .struct term_c_iflag + 4 term_c_oflag: @ output modes .struct term_c_oflag + 4 term_c_cflag: @ control modes .struct term_c_cflag + 4 term_c_lflag: @ local modes .struct term_c_lflag + 4 term_c_cc: @ special characters .struct term_c_cc + 20 @ see length if necessary term_fin: /* structure sigaction see doc linux */ .struct 0 sa_handler: .struct sa_handler + 4 sa_mask: .struct sa_mask + 4 sa_flags: .struct sa_flags + 4 sa_sigaction: .struct sa_sigaction + 4 sa_fin: /* structure poll see doc linux */ .struct 0 poll_fd: @ File Descriptor .struct poll_fd + 4 poll_events: @ events mask .struct poll_events + 4 poll_revents: @ events returned .struct poll_revents + 4 poll_fin: /*********************************/ /* Initialized data */ /*********************************/ .data szMessPgmOk: .asciz "End program OK.\n" szMessErreur: .asciz "Error detected.\n" sMessResult: .ascii "Value : " sMessValeur: .fill 11, 1, ' ' @ size => 11 szCarriageReturn: .asciz "\n" .align 4 /*********************************/ /* UnInitialized data */ /*********************************/ .bss .align 4 iEnd: .skip 4 @ 0 loop 1 = end loop iTouche: .skip BUFSIZE @ value key pressed stOldtio: .skip term_fin @ old terminal state stCurtio: .skip term_fin @ current terminal state stSigAction: .skip sa_fin @ area signal structure stSigAction1: .skip sa_fin stPoll1: .skip poll_fin @ area poll structure stPoll2: .skip poll_fin szBuffer: .skip BUFSIZE /*********************************/ /* code section */ /*********************************/ .text .global main main: @ entry of program bl initTerm @ terminal init mov r2,#0 ldr r3,iAdrszBuffer 1: bl getKey @ read one key cmp r0,#113 @ saisie q ? beq 3f cmp r0,#81 @ saisie Q ? beq 3f cmp r0,#0xA @ ? beq 2f strb r0,[r3,r2] @ store byte in buffer add r2,#1 b 1b 2: @ display buffer mov r0,#0 @ store 0 final strb r0,[r3,r2] mov r0,r3 bl affichageMess ldr r0,iAdrszCarriageReturn bl affichageMess mov r2,#0 b 1b 3: bl restauTerm @ terminal restaur ldr r0,iAdrszMessPgmOk @ display end message bl affichageMess 100: @ standard end of the program mov r0, #0 @ return code mov r7, #EXIT @ request to exit program svc #0 @ perform the system call iAdrszBuffer: .int szBuffer /*********************************/ /* init terminal state */ /*********************************/ initTerm: push {r0,r1,r2,r7,lr} /* read terminal state */ mov r0,#STDIN @ input console mov r1,#TCGETS ldr r2,iAdrstOldtio mov r7, #IOCTL @ call system Linux svc #0 cmp r0,#0 @ error ? beq 1f ldr r1,iAdrszMessErreur @ error message bl displayError b 100f 1: adr r0,sighandler @ adresse routine traitement signal ldr r1,iAdrstSigAction @ adresse structure sigaction str r0,[r1,#sa_handler] @ maj handler mov r0,#SIGINT @ signal type ldr r1,iAdrstSigAction mov r2,#0 @ NULL mov r7, #SIGACTION @ call system svc #0 cmp r0,#0 @ error ? bne 98f mov r0,#SIGQUIT ldr r1,iAdrstSigAction mov r2,#0 @ NULL mov r7, #SIGACTION @ call system svc #0 cmp r0,#0 @ error ? bne 98f mov r0,#SIGTERM ldr r1,iAdrstSigAction mov r2,#0 @ NULL mov r7, #SIGACTION @ appel systeme svc #0 cmp r0,#0 bne 98f @ adr r0,iAdrSIG_IGN @ address signal igonre function ldr r1,iAdrstSigAction1 str r0,[r1,#sa_handler] mov r0,#SIGTTOU @invalidate other process signal ldr r1,iAdrstSigAction1 mov r2,#0 @ NULL mov r7,#SIGACTION @ call system svc #0 cmp r0,#0 bne 98f @ /* read terminal current state */ mov r0,#STDIN mov r1,#TCGETS ldr r2,iAdrstCurtio @ address current termio mov r7,#IOCTL @ call systeme svc #0 cmp r0,#0 @ error ? bne 98f mov r2,#ICANON | ECHO @ no key pressed echo on display mvn r2,r2 @ and one key ldr r1,iAdrstCurtio ldr r3,[r1,#term_c_lflag] and r3,r2 @ add flags str r3,[r1,#term_c_lflag] @ and store mov r0,#STDIN @ maj terminal current state mov r1,#TCSETS ldr r2,iAdrstCurtio mov r7, #IOCTL @ call system svc #0 cmp r0,#0 beq 100f 98: @ error display ldr r1,iAdrszMessErreur @ error message bl displayError 100: pop {r0,r1,r2,r7,lr} bx lr /*********************************/ /* read key */ /*********************************/ getKey: push {r1,r2,r7,lr} ldr r2,iAdriTouche @ key address mov r0,#0 @ raz key str r0,[r2] 1: ldr r0,iAdriEnd @ if signal ctrl-c -> end ldr r0,[r0] cmp r0,#0 bne 100f ldr r0,iAdrstPoll1 @ address structure poll mov r1,#STDIN str r1,[r0,#poll_fd] @ maj FD mov r1,#POLLIN @ action code str r1,[r0,#poll_events] mov r1,#1 @ items number structure poll mov r2,#0 @ timeout = 0 mov r7,#SYSPOLL @ call system POLL svc #0 cmp r0,#0 @ key pressed ? ble 1b @ no key pressed -> loop @ read key mov r0,#STDIN @ File Descriptor ldr r1,iAdriTouche @ buffer address mov r2,#BUFSIZE @ buffer size mov r7,#READ @ read key svc #0 cmp r0,#0 @ error ? ble 98f ldr r2,iAdriTouche @ key address ldr r0,[r2] b 100f 98: @ error display ldr r1,iAdrszMessErreur @ error message bl displayError 100: pop {r1,r2,r7,lr} bx lr /*********************************/ /* restaur terminal state */ /*********************************/ restauTerm: push {r0,r1,r7,lr} mov r0,#STDIN @ end then restaur begin state terminal mov r1,#TCSETS ldr r2,iAdrstOldtio mov r7,#IOCTL @ call system svc #0 cmp r0,#0 beq 100f ldr r1,iAdrszMessErreur @ error message bl displayError 100: pop {r1,r2,r7,lr} bx lr iAdrsMessValeur: .int sMessValeur iAdrszMessErreur: .int szMessErreur iAdrszCarriageReturn: .int szCarriageReturn iAdrstOldtio: .int stOldtio iAdrstCurtio: .int stCurtio iAdrstSigAction: .int stSigAction iAdrstSigAction1: .int stSigAction1 iAdrszMessPgmOk: .int szMessPgmOk iAdrsMessResult: .int sMessResult iAdrSIG_IGN: .int 1 iAdriEnd: .int iEnd iAdrstPoll1: .int stPoll1 iAdriTouche: .int iTouche /******************************************************************/ /* signal processing */ /******************************************************************/ sighandler: push {r0,r1} ldr r0,iAdriEnd mov r1,#1 @ maj zone end str r1,[r0] pop {r0,r1} bx lr /***************************************************/ /* ROUTINES INCLUDE */ /***************************************************/ .include "../affichage.inc"