Tool for solving LSCVM challenges in CDDC 2019
Max stack size is 0x3ff 1023
Max Number of Cycles 0x2710 10000
Fgets reads 0x1000 4096 chars of instructions
VM memory size is 0x3fff
| Opcode (Hex) | Opcode (Char) | Assmebly | Comment |
|---|---|---|---|
| Default | NIL | nop | no operation, waste cycle |
| 0x0a | \n | nop | no operation, waste cycle |
| 0x20 | \s | nop | no operation, waste cycle |
| 0x41 | A | add | Pop 2 values from stack and push the addition |
| 0x42 | B | hlt | Stop executing code |
| 0x43 | C | jmp | Pop and jump to value |
| 0x44 | D | pop | Pop a value and do nothing |
| 0x45 | E | read | Pop addr and push val. 0 <= addr <= 0x3fff |
| 0x46 | F | sclone | pop value n and (clone) push n+1 th previous stack value |
| 0x47 | G | ipadd | Pop value and add it to IP |
| 0x48 | H | sshift | pop value n and shift n+1 th previous stack value to the top of the stack |
| 0x49 | I | pint | Pop value and Print as int |
| 0x4a | J | cmp | 0 if equal, 1 if first pop is smaller else 0xffffffff. 0 <= addr <= 0x3fff |
| 0x4b | K | write | first pop is addr, 2nd pop is value to write |
| 0x4d | M | mul | Pop 2 values from stack and push the multiplication |
| 0x50 | P | pchar | Pops value from stack and print as char |
| 0x52 | R | rjmp | Jump to previous jump location, cant do twice in a row, because it consumes the previous jump location. |
| 0x53 | S | sub | subtract 1st pop from 2nd pop push result |
| 0x56 | V | div | Divide (floor) 2nd pop by 1st pop and push result |
| 0x5a | Z | ipcadd | conditional add to IP, if 2nd pop is 0, add 1st pop to IP |
| 0x61 | a | p0 | Push 0x00 to stack |
| 0x62 | b | p1 | Push 0x01 to stack |
| 0x63 | c | p2 | Push 0x02 to stack |
| 0x64 | d | p3 | Push 0x03 to stack |
| 0x65 | e | p4 | Push 0x04 to stack |
| 0x66 | f | p5 | Push 0x05 to stack |
| 0x67 | g | p6 | Push 0x06 to stack |
| 0x68 | h | p7 | Push 0x07 to stack |
| 0x69 | i | p8 | Push 0x08 to stack |
| 0x6a | j | p9 | Push 0x09 to stack |
print welcome msg
cfMcfMhiMfAhiMfAhiMfAeiMaAeiMjAhhcMMdAgjcMMcAhhcMMhAhhcMMgAhhcMMbAdfgMMhAijMfAeiMaAgjcMMaAdfgMMhAeehMMfAeehMMeAeehMMcAhhcMMhAjjMfAeiMaAeehMMaAeehMMcAgjcMMdAhjMeAeiMaAhhcMMcAhhcMMdAhhcMMdAeehMMaAjjMcAeehMMeAhhcMMgAhhcMMfAhhcMMhAijMeAeiMiAijMfAjjMfAhjMeAjjMcAijMeAeiMaAgjcMMdAeehMMeAeiMaAhhcMMdAgjcMMbAgjcMMdAhhcMMbAgjcMMaAhhcMMdAjjMgAeiMaAhiMfAhiMfAhiMfAcfMPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPP
print 'password: '
eiMaAhiMcAeiMaAhhcMMcAeehMMcAgjcMMdAeehMMhAeehMMdAeehMMdAdfgMMhAijMiAPPPPPPPPPPP
print ', Good Bye!\n'
cfMcfMeiMbAhhcMMdAefgMMbAhjMdAeiMaAhhcMMcAgjcMMdAgjcMMdAhjMiAeiMaAghMcAPPPPPPPPPPPPP
print '[-] Password mismatch'
cfMhhcMMgAhhcMMbAeehMMeAdfgMMhAgjcMMbAeehMMdAhhcMMhAgjcMMbAeiMaAhhcMMcAeehMMcAgjcMMdAeehMMhAeehMMdAeehMMdAdfgMMhAijMiAeiMaAdfgMMdAghMdAdfgMMbAPPPPPPPPPPPPPPPPPPPPPP
print 'Wrong ID'
cfMhhcMMcAhhcMMhAeiMaAhhcMMfAgjcMMcAgjcMMdAeehMMcAjjMgAeiMaAdfgMMdAghMdAdfgMMbAPPPPPPPPPPPPP
writes 'lsc_user' to memory address `0x0`
jjMdjMAajjMfhMbSAbjjMcjMAcjjMchMAdjjMfhMbAAejjMfhMbSAfjjMcjMAcAgjjMfhMcSAhKKKKKKKK