Kwi-PHDays ye-9 yokugqibela siye sabamba ukhuphiswano lokugqekeza iziko lokumpompa irhasi - ukhuphiswano . Kwakukho izikhundla ezintathu kwisayithi kunye neeparitha zokhuseleko ezahlukeneyo (Akukho uKhuseleko, uKhuseleko oluPhantsi, uKhuseleko oluPhezulu), ukulinganisa inkqubo yoshishino efanayo: umoya ophantsi koxinzelelo waphonswa kwibhaluni (kwaye wakhululwa).
Nangona iiparitha ezahlukeneyo zokhuseleko, ukubunjwa kwe-hardware ye-stands kwakufana: i-Siemens Simatic PLC S7-300 series; iqhosha le-deflation likaxakeka kunye nesixhobo sokulinganisa uxinzelelo (uxhunywe kwi-PLC yamagalelo edijithali (DI)); iivalve ezisebenzela ukunyuka kwamaxabiso kunye ne-deflation of air (exhunywe kwiziphumo zedijithali ze-PLC (DO)) - jonga umfanekiso ongezantsi.
I-PLC, ngokuxhomekeke kwimiba yoxinzelelo kwaye ngokuhambelana neprogram yayo, yenza isigqibo sokukhupha okanye ukukhupha ibhola (ivule kwaye ivale iivalve ezihambelanayo). Nangona kunjalo, zonke izikhundla zinendlela yokulawula i-manual, eyenza kube lula ukulawula i-valve ngaphandle kwemingcele.
Izitendi zahlukile kubunzima bokuvumela le ndlela: kwindawo yokuma engakhuselwanga bekulula ukuyenza le nto, kwaye kwindawo yoKhuseleko oluPhezulu kwakunzima ngokuhambelanayo.
Ezintlanu kwezintandathu iingxaki zasonjululwa ngeentsuku ezimbini; Umthathi-nxaxheba wokuqala ufumene amanqaku angama-233 (wachitha iveki elungiselela ukhuphiswano). Abaphumeleleyo abathathu: Ndibeka - a1exdandy, II - Rubikoid, III - Ze.
Nangona kunjalo, ngexesha le-PHDays, akukho namnye kubathathi-nxaxheba okwazileyo ukuzoyisa zontathu izikhundla, ngoko siye sagqiba ekubeni senze ukhuphiswano lwe-intanethi kwaye sapapasha owona msebenzi unzima ekuqaleni kukaJuni. Abathathi-nxaxheba kwafuneka bagqibe umsebenzi kwisithuba senyanga, bafumane iflegi, kwaye bachaze isisombululo ngokweenkcukacha nangendlela enomdla.
Ngezantsi kokusikwa sipapasha uhlalutyo lwesona sisombululo singcono kumsebenzi ovela kwabo bathunyelwe ngenyanga, yafunyanwa ngu-Alexey Kovrizhnykh (a1exdandy) kwinkampani yeDigital Security, eyathatha indawo ye-XNUMX kukhuphiswano ngexesha le-PHDays. Ngezantsi sinika isicatshulwa sayo kunye nezimvo zethu.
Uhlalutyo lokuqala
Ke, lo msebenzi ubuqulathe uvimba onezi fayile zilandelayo:
- block_upload_traffic.pcapng
- DB100.bin
- iingcebiso.txt
Ifayile ye hints.txt iqulethe ulwazi oluyimfuneko kunye neengcebiso zokusombulula umsebenzi. Nantsi imixholo yayo:
- UPetrovich undixelele izolo ukuba ungalayisha iibhloko ukusuka kwiPlcSim ukuya kwiNyathelo7.
- I-Siemens Simatic S7-300 series PLC isetyenziswe kwindawo yokuma.
- I-PlcSim sisilinganisi se-PLC esikuvumela ukuba usebenzise kwaye ulungise iinkqubo ze-Siemens S7 PLCs.
Ifayile yeDB100.bin ibonakala iqulathe ibhloko yedatha yeDB100 PLC: 00000000: 0100 0102 6e02 0401 0206 0100 0101 0102 ....n......... 00000010: 1002 0501 0202 2002 0501 0206 0100 0102 . ..... ......... 00000020: 0102 7702 0401 0206 0100 0103 0102 0a02 ..w............. 00000030: 0501 0202 1602 0501 0206 0100 ................ 0104: 0102 00000040 7502 0401 0206 0100 0105a0102 0 u............... 02: 0501 00000050 0202 1602 0501 0206 0100 0106..........0102. 3402: 4 00000060 0401 0206 0100 0107 0102 2602 .........&..... 0501: 0202c00000070 4 02 0501 0206 0100 0108 ......... : 0102 3302 0401 3 00000080a0206 0100 0109 0102 ................ 0: 02 0501 0202 1602a 00000090 0501 0206 0100 ............ 010a0102: 3702 0401b 0206 7 000000 0 0100 010 ......".....F... 0102b2202: 0501 0202 4602c 0501 000000 0 ... ... .... 0206e0100: 010 0102 3302 0401 0206 0100 3 000000 ........#...... 0f010: 0102 0 02 0501 0202 1602 0501 ........ ..... 0206: 000000 0 0100 010 0102 6 02 0401 ......%......... 0206: 0100 010 000000 0 0102 1102 ..... 0501 . ......&. 0202: 2302 0501 0206c0100 000000 0 0110 ....L......
Njengoko igama libonisa, ifayile ye-block_upload_traffic.pcapng iqulethe indawo yokulahla i-block upload traffic kwi-PLC.
Kuyaphawuleka ukuba le ndawo yokulahlwa kwetrafikhi kwindawo yokhuphiswano ngexesha lenkomfa bekunzima kakhulu ukuyifumana. Ukwenza oku, kwakuyimfuneko ukuqonda iskripthi kwifayile yeprojekthi yeTeslaSCADA2. Ukusuka kuyo kwakunokwenzeka ukuqonda ukuba indawo yokulahla efihliweyo kusetyenziswa i-RC4 ibekwe phi kwaye sesiphi isitshixo esifunekayo ukuze sisetyenziswe ukuyisusa. Ukulahlwa kweebhloko zedatha kwisiza kunokufunyanwa kusetyenziswa umxhasi weprotocol ye-S7. Kule nto ndisebenzise umxhasi wedemo ukusuka kwiphakheji ye-Snap7.
Ukutsalwa kweebhloko zokusetyenzwa komqondiso kwindawo yokulahla izithuthi
Ukujonga imixholo yokulahla, unokuqonda ukuba iqulethe iibhloko zokusetyenzwa komqondiso OB1, FC1, FC2 kunye neFC3:
Ezi bloko kufuneka zisuswe. Oku kunokwenziwa, umzekelo, ngesi script silandelayo, emva kokuguqula itrafikhi kwifomati yepcapng ukuya kwipcap:
#!/usr/bin/env python2
import struct
from scapy.all import *
packets = rdpcap('block_upload_traffic.pcap')
s7_hdr_struct = '>BBHHHHBB'
s7_hdr_sz = struct.calcsize(s7_hdr_struct)
tpkt_cotp_sz = 7
names = iter(['OB1.bin', 'FC1.bin', 'FC2.bin', 'FC3.bin'])
buf = ''
for packet in packets:
if packet.getlayer(IP).src == '10.0.102.11':
tpkt_cotp_s7 = str(packet.getlayer(TCP).payload)
if len(tpkt_cotp_s7) < tpkt_cotp_sz + s7_hdr_sz:
continue
s7 = tpkt_cotp_s7[tpkt_cotp_sz:]
s7_hdr = s7[:s7_hdr_sz]
param_sz = struct.unpack(s7_hdr_struct, s7_hdr)[4]
s7_param = s7[12:12+param_sz]
s7_data = s7[12+param_sz:]
if s7_param in ('x1ex00', 'x1ex01'): # upload
buf += s7_data[4:]
elif s7_param == 'x1f':
with open(next(names), 'wb') as f:
f.write(buf)
buf = ''Emva kokuphonononga iibhloko ezibangelwayo, uya kuqaphela ukuba zihlala ziqala ngee-bytes 70 70 (pp). Ngoku kufuneka ufunde indlela yokuyihlalutya. Ingcebiso yesabelo icebisa ukuba kufuneka usebenzise i-PlcSim koku.
Ukufumana imiyalelo efundeka ngabantu kwiibhloko
Okokuqala, makhe sizame ukucwangcisa i-S7-PlcSim ngokulayisha iibhloko ezininzi ngemiyalelo ephindaphindayo (= Q 0.0) kuyo kusetyenziswa isoftware yoMphathi weSimatic, kunye nokugcina i-PLC efunyenwe kwi-emulator kwifayile ye-example.plc. Ngokujonga imixholo yefayile, unokumisela ngokulula ukuqala kweebhloko ezikhutshelweyo ngokutyikitya i-70 70, esiyifumene ngaphambili. Ngaphambi kweebhloko, ngokucacileyo, ubungakanani bebhloko bubhalwe njengexabiso le-4-byte encinci-endian.
Emva kokuba sifumene ulwazi malunga nokwakheka kweefayile ze-plc, isicwangciso sokusebenza silandelayo sivele sokufunda iinkqubo ze-PLC S7:
- Ukusebenzisa uMphathi weSimatic, senza isakhiwo sebhloko kwi-S7-PlcSim efana naleyo esiyifumene kwindawo yokulahla. Ubungakanani beebhloko kufuneka buhambelane (oku kuphunyezwa ngokuzalisa iibhloko ngenani elifunekayo lemiyalelo) kunye nezazisi zazo (OB1, FC1, FC2, FC3).
- Gcina i-PLC kwifayile.
- Sitshintsha imixholo yeebhloko kwifayile esiphumo kunye neebhloko ezivela kwi-traffic dump. Ukuqala kweebhloko kugqitywa ngutyikityo.
- Silayisha ifayile esiphumo kwi-S7-PlcSim kwaye sijonge imixholo yeebhloko kuMphathi weSimatic.
Iibhloko zinokutshintshwa, umzekelo, ngale khowudi ilandelayo:
with open('original.plc', 'rb') as f:
plc = f.read()
blocks = []
for fname in ['OB1.bin', 'FC1.bin', 'FC2.bin', 'FC3.bin']:
with open(fname, 'rb') as f:
blocks.append(f.read())
i = plc.find(b'pp')
for block in blocks:
plc = plc[:i] + block + plc[i+len(block):]
i = plc.find(b'pp', i + 1)
with open('target.plc', 'wb') as f:
f.write(plc)U-Alexey wathatha indlela enzima ngakumbi, kodwa echanekileyo. Sicinge ukuba abathathi-nxaxheba baya kusebenzisa inkqubo ye-NetToPlcSim ukuze i-PlcSim inxibelelane ngothungelwano, ifake iibhloko kwi-PlcSim nge-Snap7, emva koko ikhuphele ezi bhloko njengeprojekthi esuka kwi-PlcSim isebenzisa imeko-bume yophuhliso.
Ngokuvula ifayile enesiphumo kwi-S7-PlcSim, unokufunda iibhloko ezibhalwe ngaphezulu usebenzisa iSimatic Manager. Eyona misebenzi yolawulo lwesixhobo irekhodwa kwibhloko FC1. Eyona nto ibalulekileyo yi-#TEMP0 eguquguqukayo, ethi xa ivuliwe ibonakala ibeka ulawulo lwe-PLC kwimowudi ye-manual esekelwe kumaxabiso ememori ye-M2.2 kunye ne-M2.3 bit. #TEMP0 ixabiso limiselwe ngumsebenzi FC3.
Ukusombulula ingxaki, kufuneka uhlalutye umsebenzi weFC3 kwaye uqonde ukuba yintoni ekufuneka yenziwe ukuze ibuyise ingqiqo.
Iibhloko ze-PLC zokucwangcisa izibonakaliso kwi-Low Security stand kwindawo yokhuphiswano zilungiselelwe ngendlela efanayo, kodwa ukubeka ixabiso le- #TEMP0 variable, kwakwanele ukubhala umgca indlela yam ye-ninja kwi-block ye-DB1. Ukujonga ixabiso kwibhloko kwakuthe ngqo kwaye akuzange kufune ulwazi olunzulu lwebhloko yolwimi lweprogram. Ngokucacileyo, kwinqanaba loKhuseleko oluPhezulu, ukufezekisa ulawulo lwezandla kuya kuba nzima kakhulu kwaye kuyimfuneko ukuqonda ubuqhetseba bolwimi lwe-STL (enye yeendlela zokucwangcisa i-S7 PLC).
Buyela umva ibloko FC3
Imixholo yebloko yeFC3 kumelo lwe-STL:
L B#16#0
T #TEMP13
T #TEMP15
L P#DBX 0.0
T #TEMP4
CLR
= #TEMP14
M015: L #TEMP4
LAR1
OPN DB 100
L DBLG
TAR1
<=D
JC M016
L DW#16#0
T #TEMP0
L #TEMP6
L W#16#0
<>I
JC M00d
L P#DBX 0.0
LAR1
M00d: L B [AR1,P#0.0]
T #TEMP5
L W#16#1
==I
JC M007
L #TEMP5
L W#16#2
==I
JC M008
L #TEMP5
L W#16#3
==I
JC M00f
L #TEMP5
L W#16#4
==I
JC M00e
L #TEMP5
L W#16#5
==I
JC M011
L #TEMP5
L W#16#6
==I
JC M012
JU M010
M007: +AR1 P#1.0
L P#DBX 0.0
LAR2
L B [AR1,P#0.0]
L C#8
*I
+AR2
+AR1 P#1.0
L B [AR1,P#0.0]
JL M003
JU M001
JU M002
JU M004
M003: JU M005
M001: OPN DB 101
L B [AR2,P#0.0]
T #TEMP0
JU M006
M002: OPN DB 101
L B [AR2,P#0.0]
T #TEMP1
JU M006
M004: OPN DB 101
L B [AR2,P#0.0]
T #TEMP2
JU M006
M00f: +AR1 P#1.0
L B [AR1,P#0.0]
L C#8
*I
T #TEMP11
+AR1 P#1.0
L B [AR1,P#0.0]
T #TEMP7
L P#M 100.0
LAR2
L #TEMP7
L C#8
*I
+AR2
TAR2 #TEMP9
TAR1 #TEMP4
OPN DB 101
L P#DBX 0.0
LAR1
L #TEMP11
+AR1
LAR2 #TEMP9
L B [AR2,P#0.0]
T B [AR1,P#0.0]
L #TEMP4
LAR1
JU M006
M008: +AR1 P#1.0
L B [AR1,P#0.0]
T #TEMP3
+AR1 P#1.0
L B [AR1,P#0.0]
JL M009
JU M00b
JU M00a
JU M00c
M009: JU M005
M00b: L #TEMP3
T #TEMP0
JU M006
M00a: L #TEMP3
T #TEMP1
JU M006
M00c: L #TEMP3
T #TEMP2
JU M006
M00e: +AR1 P#1.0
L B [AR1,P#0.0]
T #TEMP7
L P#M 100.0
LAR2
L #TEMP7
L C#8
*I
+AR2
TAR2 #TEMP9
+AR1 P#1.0
L B [AR1,P#0.0]
T #TEMP8
L P#M 100.0
LAR2
L #TEMP8
L C#8
*I
+AR2
TAR2 #TEMP10
TAR1 #TEMP4
LAR1 #TEMP9
LAR2 #TEMP10
L B [AR1,P#0.0]
L B [AR2,P#0.0]
AW
INVI
T #TEMP12
L B [AR1,P#0.0]
L B [AR2,P#0.0]
OW
L #TEMP12
AW
T B [AR1,P#0.0]
L DW#16#0
T #TEMP0
L MB 101
T #TEMP1
L MB 102
T #TEMP2
L #TEMP4
LAR1
JU M006
M011: +AR1 P#1.0
L B [AR1,P#0.0]
T #TEMP7
L P#M 100.0
LAR2
L #TEMP7
L C#8
*I
+AR2
TAR2 #TEMP9
+AR1 P#1.0
L B [AR1,P#0.0]
T #TEMP8
L P#M 100.0
LAR2
L #TEMP8
L C#8
*I
+AR2
TAR2 #TEMP10
TAR1 #TEMP4
LAR1 #TEMP9
LAR2 #TEMP10
L B [AR1,P#0.0]
L B [AR2,P#0.0]
-I
T B [AR1,P#0.0]
L DW#16#0
T #TEMP0
L MB 101
T #TEMP1
L MB 102
T #TEMP2
L #TEMP4
LAR1
JU M006
M012: L #TEMP15
INC 1
T #TEMP15
+AR1 P#1.0
L B [AR1,P#0.0]
T #TEMP7
L P#M 100.0
LAR2
L #TEMP7
L C#8
*I
+AR2
TAR2 #TEMP9
+AR1 P#1.0
L B [AR1,P#0.0]
T #TEMP8
L P#M 100.0
LAR2
L #TEMP8
L C#8
*I
+AR2
TAR2 #TEMP10
TAR1 #TEMP4
LAR1 #TEMP9
LAR2 #TEMP10
L B [AR1,P#0.0]
L B [AR2,P#0.0]
==I
JCN M013
JU M014
M013: L P#DBX 0.0
LAR1
T #TEMP4
L B#16#0
T #TEMP6
JU M006
M014: L #TEMP4
LAR1
L #TEMP13
L L#1
+I
T #TEMP13
JU M006
M006: L #TEMP0
T MB 100
L #TEMP1
T MB 101
L #TEMP2
T MB 102
+AR1 P#1.0
L #TEMP6
+ 1
T #TEMP6
JU M005
M010: L P#DBX 0.0
LAR1
L 0
T #TEMP6
TAR1 #TEMP4
M005: TAR1 #TEMP4
CLR
= #TEMP16
L #TEMP13
L L#20
==I
S #TEMP16
L #TEMP15
==I
A #TEMP16
JC M017
L #TEMP13
L L#20
<I
S #TEMP16
L #TEMP15
==I
A #TEMP16
JC M018
JU M019
M017: SET
= #TEMP14
JU M016
M018: CLR
= #TEMP14
JU M016
M019: CLR
O #TEMP14
= #RET_VAL
JU M015
M016: CLR
O #TEMP14
= #RET_VALIkhowudi inde kwaye inokubonakala inzima kumntu ongayaziyo nge-STL. Akukho sizathu sokuhlalutya umyalelo ngamnye kwisakhelo seli nqaku; imiyalelo eneenkcukacha kunye nobuchule bolwimi lwe-STL inokufumaneka kwincwadana ehambelana nayo: . Apha ndiya kubonisa ikhowudi efanayo emva kokucubungula - ukuqamba ngokutsha iilebhile kunye neziguquko kunye nokongeza izimvo ezichaza i-algorithm yokusebenza kunye nolwakhiwo oluthile lwe-STL yolwimi. Makhe ndiqaphele ngokukhawuleza ukuba ibhloko ekuthethwa ngayo iqulethe umatshini obonakalayo owenza i-bytecode ethile ebekwe kwibhloko ye-DB100, imixholo esiyaziyo. Imiyalelo kumatshini obonakalayo iquka i-byte enye yekhowudi yokusebenza kunye nee-byte zeengxabano, ibhayithi enye kwimpikiswano nganye. Yonke imiyalelo eqwalaselweyo ineengxoxo ezimbini; Ndikhethe amaxabiso abo kumagqabantshintshi njengo-X kunye no-Y.
Ikhowudi emva kokucubungula]
# Инициализация различных переменных
L B#16#0
T #CHECK_N # Счетчик успешно пройденных проверок
T #COUNTER_N # Счетчик общего количества проверок
L P#DBX 0.0
T #POINTER # Указатель на текущую инструкцию
CLR
= #PRE_RET_VAL
# Основной цикл работы интерпретатора байт-кода
LOOP: L #POINTER
LAR1
OPN DB 100
L DBLG
TAR1
<=D # Проверка выхода указателя за пределы программы
JC FINISH
L DW#16#0
T #REG0
L #TEMP6
L W#16#0
<>I
JC M00d
L P#DBX 0.0
LAR1
# Конструкция switch - case для обработки различных опкодов
M00d: L B [AR1,P#0.0]
T #OPCODE
L W#16#1
==I
JC OPCODE_1
L #OPCODE
L W#16#2
==I
JC OPCODE_2
L #OPCODE
L W#16#3
==I
JC OPCODE_3
L #OPCODE
L W#16#4
==I
JC OPCODE_4
L #OPCODE
L W#16#5
==I
JC OPCODE_5
L #OPCODE
L W#16#6
==I
JC OPCODE_6
JU OPCODE_OTHER
# Обработчик опкода 01: загрузка значения из DB101[X] в регистр Y
# OP01(X, Y): REG[Y] = DB101[X]
OPCODE_1: +AR1 P#1.0
L P#DBX 0.0
LAR2
L B [AR1,P#0.0] # Загрузка аргумента X (индекс в DB101)
L C#8
*I
+AR2
+AR1 P#1.0
L B [AR1,P#0.0] # Загрузка аргумента Y (индекс регистра)
JL M003 # Аналог switch - case на основе значения Y
JU M001 # для выбора необходимого регистра для записи.
JU M002 # Подобные конструкции используются и в других
JU M004 # операциях ниже для аналогичных целей
M003: JU LOOPEND
M001: OPN DB 101
L B [AR2,P#0.0]
T #REG0 # Запись значения DB101[X] в REG[0]
JU PRE_LOOPEND
M002: OPN DB 101
L B [AR2,P#0.0]
T #REG1 # Запись значения DB101[X] в REG[1]
JU PRE_LOOPEND
M004: OPN DB 101
L B [AR2,P#0.0]
T #REG2 # Запись значения DB101[X] в REG[2]
JU PRE_LOOPEND
# Обработчик опкода 02: загрузка значения X в регистр Y
# OP02(X, Y): REG[Y] = X
OPCODE_2: +AR1 P#1.0
L B [AR1,P#0.0]
T #TEMP3
+AR1 P#1.0
L B [AR1,P#0.0]
JL M009
JU M00b
JU M00a
JU M00c
M009: JU LOOPEND
M00b: L #TEMP3
T #REG0
JU PRE_LOOPEND
M00a: L #TEMP3
T #REG1
JU PRE_LOOPEND
M00c: L #TEMP3
T #REG2
JU PRE_LOOPEND
# Опкод 03 не используется в программе, поэтому пропустим его
...
# Обработчик опкода 04: сравнение регистров X и Y
# OP04(X, Y): REG[0] = 0; REG[X] = (REG[X] == REG[Y])
OPCODE_4: +AR1 P#1.0
L B [AR1,P#0.0]
T #TEMP7 # первый аргумент - X
L P#M 100.0
LAR2
L #TEMP7
L C#8
*I
+AR2
TAR2 #TEMP9 # REG[X]
+AR1 P#1.0
L B [AR1,P#0.0]
T #TEMP8
L P#M 100.0
LAR2
L #TEMP8
L C#8
*I
+AR2
TAR2 #TEMP10 # REG[Y]
TAR1 #POINTER
LAR1 #TEMP9 # REG[X]
LAR2 #TEMP10 # REG[Y]
L B [AR1,P#0.0]
L B [AR2,P#0.0]
AW
INVI
T #TEMP12 # ~(REG[Y] & REG[X])
L B [AR1,P#0.0]
L B [AR2,P#0.0]
OW
L #TEMP12
AW # (~(REG[Y] & REG[X])) & (REG[Y] | REG[X]) - аналог проверки на равенство
T B [AR1,P#0.0]
L DW#16#0
T #REG0
L MB 101
T #REG1
L MB 102
T #REG2
L #POINTER
LAR1
JU PRE_LOOPEND
# Обработчик опкода 05: вычитание регистра Y из X
# OP05(X, Y): REG[0] = 0; REG[X] = REG[X] - REG[Y]
OPCODE_5: +AR1 P#1.0
L B [AR1,P#0.0]
T #TEMP7
L P#M 100.0
LAR2
L #TEMP7
L C#8
*I
+AR2
TAR2 #TEMP9 # REG[X]
+AR1 P#1.0
L B [AR1,P#0.0]
T #TEMP8
L P#M 100.0
LAR2
L #TEMP8
L C#8
*I
+AR2
TAR2 #TEMP10 # REG[Y]
TAR1 #POINTER
LAR1 #TEMP9
LAR2 #TEMP10
L B [AR1,P#0.0]
L B [AR2,P#0.0]
-I # ACCU1 = ACCU2 - ACCU1, REG[X] - REG[Y]
T B [AR1,P#0.0]
L DW#16#0
T #REG0
L MB 101
T #REG1
L MB 102
T #REG2
L #POINTER
LAR1
JU PRE_LOOPEND
# Обработчик опкода 06: инкремент #CHECK_N при равенстве регистров X и Y
# OP06(X, Y): #CHECK_N += (1 if REG[X] == REG[Y] else 0)
OPCODE_6: L #COUNTER_N
INC 1
T #COUNTER_N
+AR1 P#1.0
L B [AR1,P#0.0]
T #TEMP7 # REG[X]
L P#M 100.0
LAR2
L #TEMP7
L C#8
*I
+AR2
TAR2 #TEMP9 # REG[X]
+AR1 P#1.0
L B [AR1,P#0.0]
T #TEMP8
L P#M 100.0
LAR2
L #TEMP8
L C#8
*I
+AR2
TAR2 #TEMP10 # REG[Y]
TAR1 #POINTER
LAR1 #TEMP9 # REG[Y]
LAR2 #TEMP10 # REG[X]
L B [AR1,P#0.0]
L B [AR2,P#0.0]
==I
JCN M013
JU M014
M013: L P#DBX 0.0
LAR1
T #POINTER
L B#16#0
T #TEMP6
JU PRE_LOOPEND
M014: L #POINTER
LAR1
# Инкремент значения #CHECK_N
L #CHECK_N
L L#1
+I
T #CHECK_N
JU PRE_LOOPEND
PRE_LOOPEND: L #REG0
T MB 100
L #REG1
T MB 101
L #REG2
T MB 102
+AR1 P#1.0
L #TEMP6
+ 1
T #TEMP6
JU LOOPEND
OPCODE_OTHER: L P#DBX 0.0
LAR1
L 0
T #TEMP6
TAR1 #POINTER
LOOPEND: TAR1 #POINTER
CLR
= #TEMP16
L #CHECK_N
L L#20
==I
S #TEMP16
L #COUNTER_N
==I
A #TEMP16
# Все проверки пройдены, если #CHECK_N == #COUNTER_N == 20
JC GOOD
L #CHECK_N
L L#20
<I
S #TEMP16
L #COUNTER_N
==I
A #TEMP16
JC FAIL
JU M019
GOOD: SET
= #PRE_RET_VAL
JU FINISH
FAIL: CLR
= #PRE_RET_VAL
JU FINISH
M019: CLR
O #PRE_RET_VAL
= #RET_VAL
JU LOOP
FINISH: CLR
O #PRE_RET_VAL
= #RET_VALUkuba unombono wemiyalelo yomatshini obonakalayo, masibhale i-disassembler encinci yokwahlula i-bytecode kwibhloko ye-DB100:
import string
alph = string.ascii_letters + string.digits
with open('DB100.bin', 'rb') as f:
m = f.read()
pc = 0
while pc < len(m):
op = m[pc]
if op == 1:
print('R{} = DB101[{}]'.format(m[pc + 2], m[pc + 1]))
pc += 3
elif op == 2:
c = chr(m[pc + 1])
c = c if c in alph else '?'
print('R{} = {:02x} ({})'.format(m[pc + 2], m[pc + 1], c))
pc += 3
elif op == 4:
print('R0 = 0; R{} = (R{} == R{})'.format(
m[pc + 1], m[pc + 1], m[pc + 2]))
pc += 3
elif op == 5:
print('R0 = 0; R{} = R{} - R{}'.format(
m[pc + 1], m[pc + 1], m[pc + 2]))
pc += 3
elif op == 6:
print('CHECK (R{} == R{})n'.format(
m[pc + 1], m[pc + 2]))
pc += 3
else:
print('unk opcode {}'.format(op))
breakNgenxa yoko, sifumana le khowudi yomatshini ilandelayo:
Ikhowudi yomatshini wenyani
R1 = DB101[0]
R2 = 6e (n)
R0 = 0; R1 = (R1 == R2)
CHECK (R1 == R0)
R1 = DB101[1]
R2 = 10 (?)
R0 = 0; R1 = R1 - R2
R2 = 20 (?)
R0 = 0; R1 = R1 - R2
CHECK (R1 == R0)
R1 = DB101[2]
R2 = 77 (w)
R0 = 0; R1 = (R1 == R2)
CHECK (R1 == R0)
R1 = DB101[3]
R2 = 0a (?)
R0 = 0; R1 = R1 - R2
R2 = 16 (?)
R0 = 0; R1 = R1 - R2
CHECK (R1 == R0)
R1 = DB101[4]
R2 = 75 (u)
R0 = 0; R1 = (R1 == R2)
CHECK (R1 == R0)
R1 = DB101[5]
R2 = 0a (?)
R0 = 0; R1 = R1 - R2
R2 = 16 (?)
R0 = 0; R1 = R1 - R2
CHECK (R1 == R0)
R1 = DB101[6]
R2 = 34 (4)
R0 = 0; R1 = (R1 == R2)
CHECK (R1 == R0)
R1 = DB101[7]
R2 = 26 (?)
R0 = 0; R1 = R1 - R2
R2 = 4c (L)
R0 = 0; R1 = R1 - R2
CHECK (R1 == R0)
R1 = DB101[8]
R2 = 33 (3)
R0 = 0; R1 = (R1 == R2)
CHECK (R1 == R0)
R1 = DB101[9]
R2 = 0a (?)
R0 = 0; R1 = R1 - R2
R2 = 16 (?)
R0 = 0; R1 = R1 - R2
CHECK (R1 == R0)
R1 = DB101[10]
R2 = 37 (7)
R0 = 0; R1 = (R1 == R2)
CHECK (R1 == R0)
R1 = DB101[11]
R2 = 22 (?)
R0 = 0; R1 = R1 - R2
R2 = 46 (F)
R0 = 0; R1 = R1 - R2
CHECK (R1 == R0)
R1 = DB101[12]
R2 = 33 (3)
R0 = 0; R1 = (R1 == R2)
CHECK (R1 == R0)
R1 = DB101[13]
R2 = 0a (?)
R0 = 0; R1 = R1 - R2
R2 = 16 (?)
R0 = 0; R1 = R1 - R2
CHECK (R1 == R0)
R1 = DB101[14]
R2 = 6d (m)
R0 = 0; R1 = (R1 == R2)
CHECK (R1 == R0)
R1 = DB101[15]
R2 = 11 (?)
R0 = 0; R1 = R1 - R2
R2 = 23 (?)
R0 = 0; R1 = R1 - R2
CHECK (R1 == R0)
R1 = DB101[16]
R2 = 35 (5)
R0 = 0; R1 = (R1 == R2)
CHECK (R1 == R0)
R1 = DB101[17]
R2 = 12 (?)
R0 = 0; R1 = R1 - R2
R2 = 25 (?)
R0 = 0; R1 = R1 - R2
CHECK (R1 == R0)
R1 = DB101[18]
R2 = 33 (3)
R0 = 0; R1 = (R1 == R2)
CHECK (R1 == R0)
R1 = DB101[19]
R2 = 26 (?)
R0 = 0; R1 = R1 - R2
R2 = 4c (L)
R0 = 0; R1 = R1 - R2
CHECK (R1 == R0)Njengoko ubona, le nkqubo ijonga ngokulula umlinganiswa ngamnye ukusuka kwi-DB101 ngokulingana kwixabiso elithile. Umgca wokugqibela wokudlula zonke iitshekhi ngu: n0w u 4r3 7h3 m4573r. Ukuba lo mgca ubekwe kwibhloko ye-DB101, ngoko ulawulo lwe-PLC lwe-manual luyasebenza kwaye kuya kwenzeka ukuba uqhume okanye udibanise ibhaluni.
Kuko konke! U-Alexey ubonise umgangatho ophezulu wolwazi olufanelekileyo kwi-industrial ninja :) Sithumele amabhaso akhumbulekayo kulowo uphumeleleyo. Enkosi kakhulu kubo bonke abathathi-nxaxheba!
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