{"id":2799,"date":"2025-07-25T10:15:20","date_gmt":"2025-07-25T09:15:20","guid":{"rendered":"https:\/\/workboot.fr\/ciela\/?page_id=2799"},"modified":"2025-07-25T10:18:18","modified_gmt":"2025-07-25T09:18:18","slug":"arm","status":"publish","type":"page","link":"https:\/\/workboot.fr\/ciela\/arm\/","title":{"rendered":"ARM"},"content":{"rendered":"\n

Introduction \u00e0 ARM<\/strong><\/h2>\n\n\n\n

ARM est une architecture de processeurs bas\u00e9e sur le concept RISC<\/strong> (Reduced Instruction Set Computer), ce qui signifie qu’elle utilise un ensemble d’instructions simplifi\u00e9es pour une ex\u00e9cution plus rapide et une consommation d’\u00e9nergie r\u00e9duite.<\/p>\n\n\n\n

Caract\u00e9ristiques principales :<\/strong><\/h3>\n\n\n\n
    \n
  • Faible consommation d’\u00e9nergie<\/strong>\u00a0\u2192 Id\u00e9al pour les appareils mobiles (smartphones, tablettes, IoT).<\/li>\n\n\n\n
  • Architecture modulaire<\/strong>\u00a0\u2192 Plusieurs versions (Cortex-A, Cortex-M, Cortex-R) adapt\u00e9es \u00e0 diff\u00e9rents besoins.<\/li>\n\n\n\n
  • Licence flexible<\/strong>\u00a0\u2192 ARM ne fabrique pas ses propres puces, mais vend des licences \u00e0 des fabricants (Qualcomm, Apple, Samsung, etc.).<\/li>\n<\/ul>\n\n\n\n

    Familles de processeurs ARM<\/strong><\/h2>\n\n\n\n
    Famille<\/th>Utilisation<\/th>Exemples<\/th><\/tr><\/thead>
    Cortex-A<\/strong><\/td>Applications haute performance (OS, smartphones)<\/td>Snapdragon (Qualcomm), Apple M1\/M2<\/td><\/tr>
    Cortex-M<\/strong><\/td>Microcontr\u00f4leurs embarqu\u00e9s (IoT, capteurs)<\/td>STM32 (STMicro), nRF52 (Nordic)<\/td><\/tr>
    Cortex-R<\/strong><\/td>Temps r\u00e9el (automobile, disques durs)<\/td>Contr\u00f4leurs de stockage, ABS voiture<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

    Mode d’ex\u00e9cution et registres<\/strong><\/h2>\n\n\n\n

    ARM fonctionne principalement en mode 32 bits (ARMv7) ou 64 bits (ARMv8-A)<\/strong>.<\/p>\n\n\n\n

    Registres principaux (ARM 32 bits) :<\/strong><\/h3>\n\n\n\n
      \n
    • R0 \u00e0 R12<\/strong>\u00a0\u2192 Registres g\u00e9n\u00e9raux.<\/li>\n\n\n\n
    • R13 (SP)<\/strong>\u00a0\u2192 Stack Pointer (pointeur de pile).<\/li>\n\n\n\n
    • R14 (LR)<\/strong>\u00a0\u2192 Link Register (adresse de retour des fonctions).<\/li>\n\n\n\n
    • R15 (PC)<\/strong>\u00a0\u2192 Program Counter (pointeur d’instruction).<\/li>\n\n\n\n
    • CPSR<\/strong>\u00a0\u2192 Registre d’\u00e9tat (flags Z, N, C, V).<\/li>\n<\/ul>\n\n\n\n

      En 64 bits (ARMv8), les registres sont \u00e9tendus \u00e0 X0-X30<\/strong>.<\/p>\n\n\n\n

       Jeu d’instructions ARM (ASM)<\/strong><\/h2>\n\n\n\n

      Syntaxe de base :<\/strong><\/h3>\n\n\n\n

      code assembleur<\/p>\n\n\n\n

      MOV R0, #42      ; R0 = 42\nADD R1, R2, R3   ; R1 = R2 + R3\nCMP R0, R1       ; Compare R0 et R1 (met \u00e0 jour les flags)\nBGT label        ; Saute si \"Greater Than\"<\/code><\/pre>\n\n\n\n
      Quelques instructions courantes :<\/strong><\/h3>\n\n\n\n
      Instruction<\/th>Description<\/th><\/tr><\/thead>
      MOV Rd, Op<\/code><\/td>D\u00e9place une valeur dans un registre<\/td><\/tr>
      ADD\/SUB Rd, Rn, Op<\/code><\/td>Addition\/Soustraction<\/td><\/tr>
      LDR Rd, [Rn]<\/code><\/td>Charge depuis la m\u00e9moire<\/td><\/tr>
      STR Rd, [Rn]<\/code><\/td>Stocke en m\u00e9moire<\/td><\/tr>
      B label<\/code><\/td>Saut inconditionnel<\/td><\/tr>
      BL func<\/code><\/td>Appel de fonction (stocke l’adresse de retour dans LR)<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n
      Pipeline et performances<\/strong><\/h2>\n\n\n\n
      ARM utilise un pipeline<\/strong> pour ex\u00e9cuter plusieurs instructions en parall\u00e8le (3 \u00e0 15 \u00e9tapes selon les mod\u00e8les).<\/p>\n\n\n\n
        \n
      • Avantage<\/strong>\u00a0: Augmente le d\u00e9bit d’ex\u00e9cution.<\/li>\n\n\n\n
      • Inconv\u00e9nient<\/strong>\u00a0: Risque de \u00ab\u00a0hazards\u00a0\u00bb (d\u00e9pendances entre instructions).<\/li>\n<\/ul>\n\n\n\n
        ARM vs x86<\/strong><\/h2>\n\n\n\n
        Crit\u00e8re<\/strong><\/th>ARM<\/strong><\/th>x86 (Intel\/AMD)<\/strong><\/th><\/tr><\/thead>
        Philosophie<\/strong><\/td>RISC (instructions simples)<\/td>CISC (instructions complexes)<\/td><\/tr>
        Consommation<\/strong><\/td>Tr\u00e8s faible<\/td>\u00c9lev\u00e9e (sauf mod\u00e8les r\u00e9cents)<\/td><\/tr>
        Performances<\/strong><\/td>Optimis\u00e9 pour mobile\/embarqu\u00e9<\/td>Optimis\u00e9 pour PC\/serveurs<\/td><\/tr>
        Licence<\/strong><\/td>Vendue \u00e0 d’autres soci\u00e9t\u00e9s<\/td>Fabriqu\u00e9 par Intel\/AMD<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n
        Applications d’ARM<\/strong><\/h2>\n\n\n\n
          \n
        • Smartphones<\/strong>\u00a0(95% du march\u00e9 : Apple A16, Snapdragon 8 Gen 2).<\/li>\n\n\n\n
        • Objets connect\u00e9s (IoT)<\/strong>\u00a0: Capteurs, montres, domotique.<\/li>\n\n\n\n
        • Serveurs<\/strong>\u00a0: Graviton (Amazon), Ampere (ARM pour data centers).<\/li>\n\n\n\n
        • Ordinateurs<\/strong>\u00a0: Apple Silicon (M1\/M2), Raspberry Pi.<\/li>\n<\/ul>\n\n\n\n
          <\/p>\n","protected":false},"excerpt":{"rendered":"
          Introduction \u00e0 ARM ARM est une architecture de processeurs bas\u00e9e sur le concept RISC (Reduced Instruction Set Computer), ce qui signifie qu’elle utilise un ensemble d’instructions simplifi\u00e9es pour une ex\u00e9cution plus rapide […]<\/p>\n","protected":false},"author":1,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"_crdt_document":"","_uag_custom_page_level_css":"","footnotes":""},"class_list":["post-2799","page","type-page","status-publish","hentry"],"yoast_head":"\nARM - workboot<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/workboot.fr\/ciela\/arm\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"ARM - workboot\" \/>\n<meta property=\"og:description\" content=\"Introduction \u00e0 ARM ARM est une architecture de processeurs bas\u00e9e sur le concept RISC (Reduced Instruction Set Computer), ce qui signifie qu’elle utilise un ensemble d’instructions simplifi\u00e9es pour une ex\u00e9cution plus rapide […]\" \/>\n<meta property=\"og:url\" content=\"https:\/\/workboot.fr\/ciela\/arm\/\" \/>\n<meta property=\"og:site_name\" content=\"workboot\" \/>\n<meta property=\"article:modified_time\" content=\"2025-07-25T09:18:18+00:00\" \/>\n<meta name=\"twitter:label1\" content=\"Dur\u00e9e de lecture estim\u00e9e\" \/>\n\t<meta name=\"twitter:data1\" content=\"2 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/workboot.fr\\\/ciela\\\/arm\\\/\",\"url\":\"https:\\\/\\\/workboot.fr\\\/ciela\\\/arm\\\/\",\"name\":\"ARM - 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