Etripator : a PC Engine disassembler

Examples

• Monster Pro Wrestling - モンスタープロレス tutorial.
• System Card bank #0.
• Gfx unpacking in Maerchen Maze - メルヘンメイズ .
• Memory Base 128 detection in Taidama Yusha Boshuchu - ただいま勇者募集中.
• Joypad routine of Street Fighter II' Champion Edition - ストリートファイターII'.
• Games Express CD Card bank #0.

Usage

etripator [options] <cfg> <in>

The options are :

• --irq-detect or -i : automatically detect and extract irq vectors when disassembling a ROM, or extract opening code and gfx from CDROM IPL data.
• --cd or -c : cdrom image disassembly. Irq detection and rom header jump are not performed.
• --help or -h : displays help.
• --out or -o < file > : main asm file containing includes for all sections as long the irq vector table if the irq-detect option is enabled.
• --labels or -l < file > : labels definition filename.
• --labels-out : extracted labels output filename. Otherwise the labels will be written to .YYMMDDhhmmss.lbl.\n"
• cfg : configuration file. It is optional if irq detection is enabled.
• in : binary to be disassembled (ROM or CDROM track).

Configuration file format

The configuration file is a standard JSON file. The supported fields are :

• filename (mandatory) : name of the output file. If multiple sections have the same output filename, their output will be appended to that file. On the other hand, note that the output file will be overwritten at each session.

• type (mandatory) : values are code or data.

  • code indicates that the section will be disassembled and output as asm code.
  • data means that the section contains data, but it will be output as code directives (.db or .dw) or binary according to the data configuration.

• page (mandatory) : memory page of the current section. It will be used to compute the file offset of the section if the offset field is missing.

• logical (mandatory) : logical address. Just like page', it will be used to compute file offset if there's no offset field.

• offset : input file offset. This field is mandatory for CD-ROM disassembly.

• size : section size. For code section, a zero (or missing size) means that the disassembly will stop when a RTS or RTI instruction is found. This field is mandatory for data sections. and CD-ROM disassembly.

• id : section id. If this option is set, all the label will be postfixed with this value. Otherwise the section index will be used.

• mpr : an array containing the page value for each memory page register.

• data : an object with 2 entries :

  • type : binary, hex or string.
  • element_size (default value: 1) : element size in bytes. The only supported values are 1 or 2.
  • elements_per_line (default value: 16) : number of elements per line.

• description (optional): description as a string or an array of strings for multiline description.

There must be only one occurence of each field per section.

Example:

{
    "cdbios_functions": {
        "filename": "syscard.asm",
        "type": "code",
        "page": "0",
        "logical" : "e000",
        "size": "505",
        "mpr": ["ff", "f8", 0, 0, 0, 0, 0, 0 ],
        "description": "CDROM Bios functions"
    },
    "ex_colorcmd.impl": {
        "filename": "syscard.asm",
        "type": "code",
        "page": "0",
        "logical" : "e509",
        "size": "ce",
        "mpr": ["ff", "f8", 0, 0, 0, 0, 0, 0 ]
    },
    "irq_vectors": {
        "filename": "syscard.asm",
        "type": "data",
        "page": "0",
        "logical": "fff6",
        "size": "a",
        "mpr": ["ff", "f8", 0, 0, 0, 0, 0, 0 ],
        "data": { "type": "hex", "element_size": 2, "elements_per_line": 1 }
    }

}

Labels definition file format

The labels definition file is a standard JSON file containing an array of labels. Each entry is an object containing the following fields:

• name: label name.
• logical : logical address of the label in hexadecimal.
• page : physical page, i.e. the value of the mpr of the logical address.
• description (optional) : description (as a string or as an array of strings).

Example:

[
    { "name":"cd_reset", "logical":"e22a", "page":"00", "description": [
        "Reset CD drive",
        "input: none",
        "output: A - $00: OK",
        "            sub error code"
    ]},
    { "name":"irq_2", "logical":"eaa3", "page":"00"},
    { "name":"irq_1", "logical":"eba5", "page":"00"},
    { "name":"irq_timer", "logical":"ea9c", "page":"00"},
    { "name":"irq_nmi", "logical":"ea9b", "page":"00"},
    { "name":"irq_reset", "logical":"eab3", "page":"00"},
    { "name":"main", "logical":"f8a4", "page":"00"}
]

Build

Etripator uses CMake as its build system. Theorically you can build Etripator for any platform supported by CMake. Here are the build step:

Configuration

mkdir build
cd build
cmake .. -DCMAKE_BUILD_TYPE=Release

Build

cmake --build . --config Release

Authors

Vincent "MooZ" Cruz