VSMX

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Description

Virtual Script Machine Instructions (VSMX) file (filename extension .jsx, a .js compiled)

History:

Rcomage can compile/decompile .jsx (VSMX) <=> .JS (need to change the VSMX version at offset 0x04 to 01 (PSP?) instead of 02 (PS3?) 

but it's very buggy and usually doesn't work right
  • VSMX files are used on:
    • PSP (inside RCO's from video/music UMDs, and two lftv firmware RCO's in flash0/vsh/resource/...)
    • PS3 (inside RAF's: on Coldboot.raf, PS3 themes animated) and some PS3 Games?
    • PSVita & PS4 (unknown)

VSMX Structure

Header

VSMX Header
Offset Size Example (hex)
from coldboot.jsx		 Value Notes
0x00 0x04 0x56534D58 VSMX Magic
0x04 0x04 0x00000200 2.0 Mayor version.Minor version (PSP=1.0) (PS3=2.0)
0x08 0x04 0x34000000 0x34 absolute offset of OPCODE table (also, header length)
0x0C 0x04 0x30100000 0x1030 length of OPCODE table (also, number of entries = length / 8)
0x10 0x04 0x64100000 0x1064 absolute offset of STRING table
0x14 0x04 0x7A000000 0x7A length of STRING table
0x18 0x04 0x08000000 0x8 number of entries inside STRING table
0x1C 0x04 0xDE100000 0x10DE absolute offset of ATTR table
0x20 0x04 0xA2000000 0xA2 length of ATTR table
0x24 0x04 0x09000000 0x9 number of entries inside ATTR table
0x28 0x04 0x80110000 0x1180 absolute offset of GLOBAL table
0x2C 0x04 0x70010000 0x170 length of GLOBAL table
0x30 0x04 0x23000000 0x23 number of entries inside GLOBAL table
  • Table access related opcodes: (this is here by now just as an argument of why to choose this names for the tables, if there are better names please suggest/discuss or change them)
    • 0x28 PUSH_STRING
    • 0x2F GETATTR, 0x30 GETATTR_KEEPOBJ
    • 0x2E PUSH_GLOBAL

OPCODE Table

The table is composed by several entries, and every entry is composed by 8 bytes:

1byte(opcode)+1byte(arguments)+1byte(unknown)+1byte(variables)+4bytes(value)

See Pastebin (without the header) of the coldboot.

OpCode
(1 byte)		 Args
(1 byte)		 Unkown
(1 byte)		 Vars
(1 byte)		 Value
(4 bytes)		 Mnemonics
(official)		 Mnemonics
(rcomage)		 group Notes
0x00 No No No No NOP UNKNOWN_0 - -
0x01 No No No No ASSGN ASSIGN Assignment Operators -
0x02 No No No No ADD ADD Arithmetic Operators -
0x03 No No No No SUB SUBTRACT Arithmetic Operators -
0x04 No No No No MUL MULTIPLY Arithmetic Operators -
0x05 No No No No DIV DIVIDE Arithmetic Operators -
0x06 No No No No MOD MODULUS Arithmetic Operators -
0x07 No No No No TO_NUMBER POSITIVE - -
0x08 No No No No CSIGN NEGATE - -
0x09 No No No No NOT NOT - -
0x0A No No No No INC PRE_INCREMENT Arithmetic Operators -
0x0B No No No No DEC PRE_DECREMENT Arithmetic Operators -
0x0C No No No No POST_INC INCREMENT Arithmetic Operators -
0x0D No No No No POST_DEC DECREMENT Arithmetic Operators -
0x0E No No No No CMPEQ TEST_EQUAL Compare Operators -
0x0F No No No No CMPNEQ TEST_NOT_EQUAL Compare Operators -
0x10 No No No No CMPSEQ TEST_IDENTITY Compare Operators -
0x11 No No No No CMPSNEQ TEST_NON_IDENTITY Compare Operators -
0x12 No No No No CMPLT TEST_LESS_THAN Compare Operators -
0x13 No No No No CMPLE TEST_LESS_EQUAL_THAN Compare Operators -
0x14 No No No No CMPGE TEST_MORE_EQUAL_THAN Compare Operators -
0x15 No No No No CMPGT TEST_MORE_THAN Compare Operators -
0x16 No No No No INSTANCEOF UNKNOWN_16 - -
0x17 No No No No IN UNKNOWN_17 - -
0x18 No No No No TYPEOF TYPEOF - -
0x19 No No No No BIT_AND BINARY_AND Bitwise Operators -
0x1A No No No No BIT_XOR BINARY_XOR Bitwise Operators -
0x1B No No No No BIT_OR BINARY_OR Bitwise Operators -
0x1C No No No No BIT_NOT BINARY_NOT Bitwise Operators -
0x1D No No No No LSHIFT LSHIFT Bitwise Operators -
0x1E No No No No S_RSHIFT RSHIFT Bitwise Operators -
0x1F No No No No U_RSHIFT UNSIGNED_RSHIFT Bitwise Operators -
0x20 No No No No COPY STACK_PUSH - -
0x21 No No No No SWAP UNKNOWN_21 - -
0x22 No No No No REMOVE END_STATEMENT - -
0x23 No No No Yes PUSH_UNDEFINED CONST_NULL Data Types -
0x24 No No No Yes PUSH_NULL CONST_EMPTY_ARRAY Data Types -
0x25 No No No Yes PUSH_BOOL CONST_BOOL Data Types -
0x26 No No No Yes PUSH_INT CONST_INT Data Types -
0x27 No No No Yes PUSH_FLOAT CONST_FLOAT Data Types -
0x28 No No No Yes PUSH_STRING CONST_STRING Data Types -
0x29 No No No Yes PUSH_OBJECT CONST_OBJECT - -
0x2A Yes No Yes Yes PUSH_FUNC FUNCTION - -
0x2B No No No Yes PUSH_ARRAY CONST_ARRAY - -
0x2C No No No Yes PUSH_THIS THIS_OBJECT - -
0x2D No No No Yes PUSH_LOCAL UNNAMED_VARIABLE - -
0x2E No No No Yes PUSH_GLOBAL NAME - -
0x2F No No No Yes GETATTR PROPERTY - -
0x30 No No No Yes GETATTR_KEEPOBJ METHOD - -
0x31 No No No Yes SETATTR SET - -
0x32 No No No Yes DELATTR UNSET - -
0x33 No No No Yes APPEND_ATTR OBJECT_ADD_ATTRIBUTE - -
0x34 No No No Yes GETITEM ARRAY_INDEX - -
0x35 No No No Yes GETITEM_KEEPOBJ UNKNOWN_35 - -
0x36 No No No Yes SETITEM ARRAY_INDEX_ASSIGN - -
0x37 No No No Yes DELITEM UNKNOWN_37 - -
0x38 No No No Yes APPEND_ITEM ARRAY_PUSH - -
0x39 No No No Yes JUMP JUMP - -
0x3A No No No Yes JUMPT JUMP_IF_TRUE - -
0x3B No No No Yes JUMPF JUMP_IF_FALSE - -
0x3C No No No No CALL_FUNC CALL_FUNCTION - -
0x3D No No No No CALL_METHOD CALL_METHOD - -
0x3E No No No Yes CALL_CONSTRUCTOR CALL_INBUILT / CALL_NEW - -
0x3F No No No No RET RETURN - -
0x40 No No No No THROW UNKNOWN_40 - -
0x41 No No No No TRYBLK_IN UNKNOWN_41 - -
0x42 No No No No TRYBLK_OUT UNKNOWN_42 - -
0x43 No No No No CATCH_FINALLYBLK_IN UNKNOWN_43 - -
0x44 No No No No CATCH_FINALLYBLK_OUT UNKNOWN_44 - -
0x45 No No No No HALT END_SCRIPT - -
0x46 No No No No DEBUG_FILE DEBUG_FILE - -
0x47 No No No No DEBUG_LINE DEBUG_LINE - -
0x48 No No No No GETITEM_KEEPOBJNAME UNKNOWN_48 - -
0x49 No No No No PUSH_VECTOR UNKNOWN_49 / MAKE_FLOAT_ARRAY Data Types -
0x4A No No No No GET_VECTOR_ELEMENT UNKNOWN_4a - -
0x4B No No No No GET_VECTOR_ELEMENT_KEEPVECTOR UNKNOWN_4b - -
0x4C No No No No ASSGN_VECTOR_ELEMENT UNKNOWN_4c - -
0x4D No No Yes Yes SETATTR_VECTOR_ELEMENT UNKNOWN_4d - byte 4 is an identifyer from a vector (x,y,z) (r,g,b,a) etc...
0x4E No No No No SETITEM_VECTOR_ELEMENT UNKNOWN_4e -

Arithmetic Operators

May be move later to PlayStation JavaScript or make it as template

Arithmetic operators are used to perform arithmetic between variables and/or values.

OpCode (VSMX) Mnemonics (VSMX) Syntax (PSJS) Description:
0x02 ADD + Addition
0x03 SUB - Subtraction
0x04 MUL * Multiplication
0x05 DIV / Division
0x06 MOD % Modulus (division remainder)
0x0A INC ++ Increment
0x0B DEC -- Decrement
0x0C POST_INC ++ Increment
0x0D POST_DEC -- Decrement

Bitwise Operators

Bit operators work on 32 bits numbers.

Any numeric operand in the operation is converted into a 32 bit number.

OpCode (VSMX) Mnemonics (VSMX) Syntax (PSJS) Description:
0x19 BIT_AND & AND
0x1B BIT_OR | OR
0x1C BIT_NOT ~ NOT
0x1A BIT_XOR ^ XOR
0x1D LSHIFT << Left Shift
0x1E S_RSHIFT >> Right Shift

Compare Operators

Comparison and Logical operators are used to test for true or false.

Comparison operators are used in logical statements to determine equality or difference between variables or values.

OpCode (VSMX) Mnemonics (VSMX) Syntax (PSJS) Description:
0x0E CMPEQ == Equality
0x10 CMPSEQ === Strict Equal value and equal type
0x0F CMPNEQ != Inequality
0x11 CMPSNEQ !== Strict not equal value or not equal type
0x15 CMPGT > Greater Than
0x14 CMPGE >= Greater Than or Equal To
0x12 CMPLT < Less Than
0x13 CMPLE <= Less Than or Equal To

Logical Operators

Comparison and Logical operators are used to test for true or false.

Logical operators are used to determine the logic between variables or values.

OpCode (VSMX) Mnemonics (VSMX) Syntax (PSJS) Description:
- || or
- && and

STRING table

ATTR Table

GLOBAL Table

VSMX Decompilation sample

This is an example of the decodification and decompilation made with the VSMX script contained inside coldboot.raf. The decompilation has been made by hand because the vsmx decompiler by ZiNgA BuRgA doesnt supports vectors and crashes, the purpose is to serve as an explain of how the opcodes works, the features that was added to VSMX v2 format for PS3, and as an overall explain of how to decompile other VSMX files

The file can be saved as .js and compiled directlly (there is no need to remove the comments), for a better view of the decompiled code without the comments in PlayStation JavaScript format see coldboot.raf page

  • Form left to right:
    • NUM - Is the opcode number (important because the JUMPS are pointers to other opcodes identifyed by his number)
    • OPCODE - The hex value that identifyes the opcode (first byte)... second byte reserved?... third byte unknown... fourth byte argument
    • VALUE - Any value, or pointer to internal VSMX tables (4 bytes)
    • OPCODE NAME - Self explanatory, is a direct conversion from the hex value to the name
    • VALUES CONVERSION - For pointers are text strings extracted from internal VSMX tables, Data types are the conversion from hex, JUMPS and FUNCTS contains also identifyers for other opcodes and arguments
    • DECOMPILED PSJS CODE - The source code in PlayStation JavaScript format ready to compile, it will generate a coldboot.jsx exactly like the one extracted from coldboot.raf by the CXML decompiler tool
Code Sample
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NPDRM · App Types · ACT.DAT · RIF
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