{"id":181694,"date":"2026-05-24T00:25:20","date_gmt":"2026-05-23T22:25:21","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/vypolneno-dizassemblirovaniya-mikrokoda-i386-i-sozdan-otkrytyj-cpu-z386"},"modified":"2026-05-24T00:25:20","modified_gmt":"2026-05-23T22:25:21","slug":"vypolneno-dizassemblirovaniya-mikrokoda-i386-i-sozdan-otkrytyj-cpu-z386","status":"publish","type":"post","link":"https:\/\/prohoster.info\/cs\/blog\/news\/vypolneno-dizassemblirovaniya-mikrokoda-i386-i-sozdan-otkrytyj-cpu-z386","title":{"rendered":"Bylo dokon\u010deno disassemblov\u00e1n\u00ed mikrok\u00f3du i386 a vytvo\u0159en otev\u0159en\u00fd CPU z386","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Nad\u0161enci se \u00fasp\u011b\u0161n\u011b poda\u0159ilo extrahovat a disassemblovat mikrocode procesoru Intel 80386, kter\u00fd byl pova\u017eov\u00e1n za \u201e\u010dernou sk\u0159\u00ed\u0148ku\u201c kv\u016fli nedostatku dokumentace. Bin\u00e1rn\u00ed obraz mikrocode byl znovu vytvo\u0159en s vyu\u017eit\u00edm AI na z\u00e1klad\u011b fotografi\u00ed \u010dipu ve vysok\u00e9m rozli\u0161en\u00ed a logika \u010dinnosti byla analyzov\u00e1na pomoc\u00ed trasov\u00e1n\u00ed spojen\u00ed na \u010dipu. Postupn\u011b byla ur\u010dena struktura mikrop\u0159\u00edkaz\u016f (\u03bc-ops), pole, po\u0159ad\u00ed vykon\u00e1v\u00e1n\u00ed a markery konce instrukc\u00ed. V\u00fdsledky projektu byly zve\u0159ejn\u011bny na GitHubu jako ve\u0159ejn\u00e9 vlastnictv\u00ed.<\/p>\n

\"Bylo<\/center><\/p>\n

Bylo zji\u0161t\u011bno, \u017ee v CPU 80386 je ka\u017ed\u00e1 instrukce pln\u011b prov\u00e1d\u011bna prost\u0159ednictv\u00edm mikrok\u00f3du, zat\u00edmco v 8086 a modern\u00edch procesorech je \u010d\u00e1st instrukc\u00ed zpracov\u00e1v\u00e1na p\u0159\u00edmo. Nav\u00edc v kontrastu s procesory 8086, v 80386 mikrok\u00f3d neimplementuje algoritmy p\u0159\u00edmo, ale p\u0159edev\u0161\u00edm nastavuje hardwarov\u00e9 akceler\u00e1tory (n\u00e1sobi\u010d, d\u011blitel, rychl\u00e9 posuny, PTU (Protection Test Unit)). <\/p>\n

B\u011bhem v\u00fdzkumu byla tak\u00e9 objevena potenci\u00e1ln\u00ed bezpe\u010dnostn\u00ed chyba p\u0159i zpracov\u00e1n\u00ed bitmapy opr\u00e1vn\u011bn\u00ed pro vstup\/v\u00fdstup (IO permission bitmap): p\u0159i 4-bajtov\u00e9m p\u0159\u00edstupu k port\u016fm byly kontrolov\u00e1ny bity opr\u00e1vn\u011bn\u00ed pouze pro prvn\u00ed 3 bajty, a p\u0159\u00edstup k 4. bajtu nebyl kontrolov\u00e1n, co\u017e teoreticky umo\u017enilo p\u0159\u00edstup k hardwarov\u00fdm registr\u016fm, ke kter\u00fdm by m\u011bl b\u00fdt p\u0159\u00edstup zak\u00e1z\u00e1n.<\/p>\n

Na z\u00e1klad\u011b publikovan\u00e9ho mikrok\u00f3du byl vyvinut otev\u0159en\u00fd CPU z386, realizovan\u00fd v jazyce SystemVerilog a funguj\u00edc\u00ed na z\u00e1klad\u011b FPGA. M\u00edsto implementace ka\u017ed\u00e9 instrukce jako samostatn\u00e9 RTL (Register-transfer level) byly v z386 implementov\u00e1ny hardwarov\u00e9 struktury \u0159\u00edzen\u00e9 p\u016fvodn\u00edm mikrok\u00f3dem. V\u00fdkon p\u0159ipraven\u00e9 realizace odpov\u00edd\u00e1 rychl\u00e9mu 386 PC (~70 MHz). Pod \u0159\u00edzen\u00edm z386 se poda\u0159ilo \u00fasp\u011b\u0161n\u011b spustit DOS 6\/7, DOS\/4GW, DOS\/32A a hry jako Doom a Cannon Fodder.
\n
Zdroj: opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

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i386 a vytvo\u0159en otev\u0159en\u00fd CPU z386 | ProHoster","description":"Nad\u0161enci \u00fasp\u011b\u0161n\u011b extrahovali a disassemblovali mikrok\u00f3d procesoru Intel 80386, kter\u00fd byl pova\u017eov\u00e1n za \"\u010dernou sk\u0159\u00ed\u0148ku\".","canonical_url":"https:\/\/prohoster.info\/cs\/blog\/news\/vypolneno-dizassemblirovaniya-mikrokoda-i386-i-sozdan-otkrytyj-cpu-z386","robots":"max-image-preview:large","keywords":"","webmasterTools":{"miscellaneous":""},"schema":null,"og:locale":"cs_CZ","og:site_name":"ProHoster | \u041a\u0443\u043f\u0438\u0442\u044c \u043d\u0430\u0434\u0435\u0436\u043d\u044b\u0439 \u0445\u043e\u0441\u0442\u0438\u043d\u0433 \u0434\u043b\u044f \u0441\u0430\u0439\u0442\u043e\u0432 \u0441 \u0437\u0430\u0449\u0438\u0442\u043e\u0439 \u043e\u0442 DDoS, VPS VDS \u0441\u0435\u0440\u0432\u0435\u0440\u044b","og:type":"article","og:title":"\ud83e\udd47\u0412\u044b\u043f\u043e\u043b\u043d\u0435\u043d\u043e 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"\u0447\u0451\u0440\u043d\u044b\u043c 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