Compare commits
2 Commits
b0a3ca6c5b
...
475c4a90d3
| Author | SHA1 | Date |
|---|---|---|
 Neale Pickett
|
475c4a90d3 | |
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Neale Pickett
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47f4d352a5 |
|
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@ -0,0 +1,92 @@
|
|||
const glyphs = [
|
||||
"\\x00", "\\x01", "\\x02", "\\x03", "\\x04", "\\x05", "\\x06", "\\x07",
|
||||
"\\x08", "\\x09", "\\x0A", "\\x0B", "\\x0C", "\\x0D", "\\x0E", "\\x0F",
|
||||
"⏵", "⏴", "↕", "‼", "¶", "§", "‽", "↨", "↑", "↓", "→", "←", "∟", "↔", "⏶", "⏷",
|
||||
" ", "!", "\"", "#", "$", "%", "&", "'", "(", ")", "*", "+", ",", "-", ".", "/",
|
||||
"0", "1", "2", "3", "4", "5", "6", "7", "8", "9", ":", ";", "<", "=", ">", "?",
|
||||
"@", "A", "B", "C", "D", "E", "F", "G", "H", "I", "J", "K", "L", "M", "N", "O",
|
||||
"P", "Q", "R", "S", "T", "U", "V", "W", "X", "Y", "Z", "[", "\\", "]", "^", "_",
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||||
"`", "a", "b", "c", "d", "e", "f", "g", "h", "i", "j", "k", "l", "m", "n", "o",
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||||
"p", "q", "r", "s", "t", "u", "v", "w", "x", "y", "z", "{", "|", "}", "~", "⌂",
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||||
|
||||
"Ç", "ü", "é", "â", "ä", "à", "å", "ç", "ê", "ë", "è", "ï", "î", "ì", "Ä", "Å",
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||||
"É", "æ", "Æ", "ô", "ö", "ò", "û", "ù", "ÿ", "Ö", "Ü", "¢", "£", "¥", "₧", "ƒ",
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||||
"á", "í", "ó", "ú", "ñ", "Ñ", "ª", "º", "¿", "⌐", "¬", "½", "¼", "¡", "«", "»",
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||||
"░", "▒", "▓", "│", "┤", "╡", "╢", "╖", "╕", "╣", "║", "╗", "╝", "╜", "╛", "┐",
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"└", "┴", "┬", "├", "─", "┼", "╞", "╟", "╚", "╔", "╩", "╦", "╠", "═", "╬", "╧",
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"╨", "╤", "╥", "╙", "╘", "╒", "╓", "╫", "╪", "┘", "┌", "█", "▄", "▌", "▐", "▀",
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"α", "ß", "Γ", "π", "Σ", "σ", "µ", "τ", "Φ", "Θ", "Ω", "δ", "∞", "φ", "ε", "∩",
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"≡", "±", "≥", "≤", "⌠", "⌡", "÷", "≈", "°", "∞", "⊻", "√", "ⁿ", "²", "■", "¤",
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]
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/**
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* Encode a buffer using fluffy glyphs
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*
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* @param {Uint8Array} buf Buffer to encode
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* @returns {String} Glyph-encoded string
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*/
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function Stringify(buf) {
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let ret = []
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for (let i of buf) {
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ret.push(glyphs[i])
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}
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return ret.join("")
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}
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/**
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* Hex encode a buffer
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*
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* @param {Uint8Array} buf Buffer to encode
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* @returns {String} Hexlified version
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*/
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function Hexlify(buf) {
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let ret = []
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for (let b of buf) {
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let hex = "00" + b.toString(16)
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ret.push(hex.slice(-2))
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}
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return ret.join(" ")
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}
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/**
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* Hex decode a string
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*
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* @param {String} str String to decode
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* @returns {Uint8Array} Decoded array
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||||
*/
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function Unhexlify(str) {
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let a = []
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let match = str.match(/[0-9a-fA-F]{2}/g) || []
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for (let m of match) {
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a.push(parseInt(m, 16))
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}
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return new Uint8Array(a)
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}
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||||
|
||||
/**
|
||||
* Read a NULL-Terminated string from a buffer.
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*
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* @param {Uint8Arrary} buf Buffer to read
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||||
* @param {Boolean} includeNull True to include the trailing NUL
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||||
* @returns {Uint8Array} String
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||||
*/
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function CString(buf, includeNull=false) {
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let end = buf.indexOf(0)
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||||
if (end == -1) {
|
||||
return buf
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||||
}
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return buf.slice(0, end + (includeNull?1:0))
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}
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||||
|
||||
/**
|
||||
* Unescapes a string with things like "\x02" in it.
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||||
*
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||||
* @param {String} str String to unescape
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||||
* @returns {String} Unescaped string
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||||
*/
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||||
function Unescape(str) {
|
||||
return str.replaceAll(/\\x?([0-9]+)/g, (_, p1) => String.fromCharCode(p1))
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||||
}
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||||
|
||||
export {Stringify, Hexlify, Unhexlify, CString, Unescape}
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||||
Binary file not shown.
|
After Width: | Height: | Size: 1.4 MiB |
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@ -0,0 +1,95 @@
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|||
---
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||||
title: Triscit
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||||
description: A CPU simulator for cybersecurity education
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||||
type: bare
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||||
---
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||||
|
||||
<!DOCTYPE html>
|
||||
<html>
|
||||
<head>
|
||||
<title>Triscit</title>
|
||||
<meta name="viewport" content="width=device-width, initial-scale=1">
|
||||
<link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/bulma@0.9.4/css/bulma.min.css">
|
||||
<link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/@mdi/font@6.5.95/css/materialdesignicons.min.css">
|
||||
|
||||
<script src="ui.mjs" type="module"></script>
|
||||
<link rel="stylesheet" href="ui.css">
|
||||
</head>
|
||||
<body>
|
||||
<section class="container">
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<div class="tile is-ancestor">
|
||||
<div class="tile is-parent">
|
||||
<div class="tile is-child notification" id="cpu-box">
|
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<div class="block is-flex is-justify-content-space-between is-align-items-end">
|
||||
<div class="block">
|
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<span class="tag is-info">PC=<b data-value="pc"></b></span>
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<span class="tag" data-flag="negative"><i class="mdi mdi-not-equal-variant"></i></span>
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||||
<span class="tag" data-flag="halt"><i class="mdi mdi-stop"></i></span>
|
||||
<span class="tag" data-flag="fire"><i class="mdi mdi-fire"></i></span>
|
||||
</div>
|
||||
<div class="controls">
|
||||
<button class="button is-primary" data-control="reset"><i class="mdi mdi-undo"></i></button>
|
||||
<button class="button is-primary" data-control="back"><i class="mdi mdi-skip-previous"></i></button>
|
||||
<button class="button is-primary" data-control="step"><i class="mdi mdi-skip-next"></i></button>
|
||||
</div>
|
||||
</div>
|
||||
<div class="table-container">
|
||||
<table class="table is-striped is-hoverable" id="instructions"></table>
|
||||
</div>
|
||||
</div>
|
||||
|
||||
<div class="tile is-vertical is-parent">
|
||||
<div class="tile is-child notification" id="io-box">
|
||||
<div class="field">
|
||||
<label class="label">Input</label>
|
||||
<div class="control">
|
||||
<input class="input" data-control="input" placeholder="\x00 style escapes accepted" value="hello">
|
||||
</div>
|
||||
</div>
|
||||
<div class="field">
|
||||
<label class="label">Output</label>
|
||||
<div class="control">
|
||||
<output class="input" data-value="output"></output>
|
||||
</div>
|
||||
</div>
|
||||
<div class="field">
|
||||
<label class="label">Program</label>
|
||||
<textarea class="textarea" data-control="program"></textarea>
|
||||
</div>
|
||||
</div>
|
||||
|
||||
<div class="tile is-child notification" id="instructions-box">
|
||||
<h2 class="title">Instructions</h2>
|
||||
<div class="table-container">
|
||||
<table class="table is-striped is-hoverable" id="instructions-help"></table>
|
||||
</div>
|
||||
</div>
|
||||
</div>
|
||||
|
||||
</div>
|
||||
</div>
|
||||
</section>
|
||||
|
||||
|
||||
<template id="instruction">
|
||||
<tr>
|
||||
<th class="addr has-text-right"><span data-fill="addr"></span></th>
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||||
<td class="name"><span data-fill="name"></span></td>
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||||
<td class="args"><span data-fill="args"></span></td>
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||||
<td class="hex"><span data-fill="hex"></span></td>
|
||||
</tr>
|
||||
</template>
|
||||
<template id="instruction-help">
|
||||
<tr>
|
||||
<td class="name" data-fill="name"></td>
|
||||
<td class="args" data-fill="args"></td>
|
||||
<td class="hex">
|
||||
<span data-fill="num"></span>
|
||||
<span data-fill="args"></span>
|
||||
</td>
|
||||
<td class="description" data-fill="description"></td>
|
||||
</tr>
|
||||
</template>
|
||||
|
||||
</body>
|
||||
</html>
|
||||
|
|
@ -0,0 +1,154 @@
|
|||
import * as Binutils from "./binutils.mjs"
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||||
|
||||
const FLAG_NEGATIVE = 1 << 0
|
||||
const FLAG_HALT = 1 << 1
|
||||
const FLAG_ABLAZE = 1 << 2
|
||||
|
||||
class Instruction {
|
||||
constructor(name, args, description) {
|
||||
this.Name = name
|
||||
this.Args = args
|
||||
this.Description = description
|
||||
}
|
||||
}
|
||||
|
||||
const Instructions = [
|
||||
new Instruction("NOOP", [], "Do nothing"),
|
||||
new Instruction("PRNT", ["x"], "Print string at x"),
|
||||
new Instruction("READ", ["x"], "Read input, store in x"),
|
||||
new Instruction("CMPS", ["x", "y"], "Compare string x to string y"),
|
||||
new Instruction("JNEQ", ["x"], "If not equal, set PC to x"),
|
||||
new Instruction("JUMP", ["x"], "Set PC to x"),
|
||||
new Instruction("HALT", [], "Terminate program"),
|
||||
new Instruction("HACF", [], "Halt And Catch Fire (never use this!)"),
|
||||
]
|
||||
|
||||
function disassemble(program) {
|
||||
let b = program[0]
|
||||
let inst = Instructions[b]
|
||||
if (inst) {
|
||||
let nargs = inst.Args.length
|
||||
let args = []
|
||||
for (let i = 0; i < nargs; i++) {
|
||||
args.push(program[i+1])
|
||||
}
|
||||
|
||||
if (1+nargs <= program.length) {
|
||||
// Only return an opcode if there was enough data for its arguments as well
|
||||
return {length: 1+nargs, name: inst.Name, args: args}
|
||||
}
|
||||
}
|
||||
|
||||
let data = Binutils.CString(program, true)
|
||||
let s = Binutils.Stringify(data)
|
||||
return {length: data.length, name: "DATA", args: [s]}
|
||||
}
|
||||
|
||||
class CPU {
|
||||
/**
|
||||
* @param {Uint8Array} program Program to load
|
||||
* @param {string} input input string
|
||||
* @param {Number} pc initial program counter
|
||||
* @param {Number} flags initial flags
|
||||
*/
|
||||
constructor(program, input, output="", pc=0, flags=0) {
|
||||
this.Program = program
|
||||
this.Input = input
|
||||
this.Output = output
|
||||
this.PC = pc
|
||||
this.Flags = flags
|
||||
}
|
||||
|
||||
Clone() {
|
||||
return new CPU(this.Program, this.Input, this.Output, this.PC, this.Flags)
|
||||
}
|
||||
|
||||
DisassembleProgram() {
|
||||
let ret = []
|
||||
let prog1 = this.Program.slice(0, this.PC)
|
||||
let addr = 0
|
||||
for (let prog of [prog1, this.Program]) {
|
||||
while (addr < prog.length) {
|
||||
let subprog = prog.slice(addr)
|
||||
let inst = disassemble(subprog)
|
||||
ret.push({
|
||||
addr,
|
||||
buf: this.Program.slice(addr, addr+inst.length),
|
||||
name: inst.name,
|
||||
args: inst.args,
|
||||
})
|
||||
addr += inst.length
|
||||
}
|
||||
}
|
||||
return ret
|
||||
}
|
||||
|
||||
Step() {
|
||||
let prog = this.Program.slice(this.PC)
|
||||
let inst = disassemble(prog)
|
||||
let flags = this.Flags
|
||||
this.Flags = 0
|
||||
switch (inst.name) {
|
||||
case "JUMP":
|
||||
this.PC = inst.args[0]
|
||||
return
|
||||
case "JNEQ":
|
||||
if (flags && FLAG_NEGATIVE) {
|
||||
this.PC = inst.args[0]
|
||||
return
|
||||
}
|
||||
break
|
||||
case "READ": {
|
||||
let addr = inst.args[0]
|
||||
let b = new TextEncoder().encode(this.Input + "\0")
|
||||
let newproglen = Math.max(this.Program.length, addr+b.length)
|
||||
let newprog = new Uint8Array(newproglen)
|
||||
|
||||
for (let i = 0; i < addr; i++) {
|
||||
newprog[i] = this.Program[i]
|
||||
}
|
||||
for (let i = 0; i < b.length; i++) {
|
||||
newprog[addr+i] = b[i]
|
||||
}
|
||||
for (let i = addr+b.length; i < this.Program.length; i++) {
|
||||
newprog[i] = this.Program[i]
|
||||
}
|
||||
this.Program = newprog
|
||||
break
|
||||
}
|
||||
case "PRNT": {
|
||||
let addr = inst.args[0]
|
||||
let prog = this.Program.slice(addr)
|
||||
this.Output = Binutils.CString(prog)
|
||||
break
|
||||
}
|
||||
case "CMPS": {
|
||||
let decoder = new TextDecoder()
|
||||
let a = decoder.decode(Binutils.CString(this.Program.slice(inst.args[0])))
|
||||
let b = decoder.decode(Binutils.CString(this.Program.slice(inst.args[1])))
|
||||
if (a != b) {
|
||||
this.Flags = FLAG_NEGATIVE
|
||||
}
|
||||
break
|
||||
}
|
||||
case "HALT":
|
||||
// Don't modify PC
|
||||
this.Flags = FLAG_HALT
|
||||
return
|
||||
case "HACF":
|
||||
this.Flags = FLAG_HALT | FLAG_ABLAZE
|
||||
return
|
||||
case "DATA":
|
||||
// Keep stepping through data one byte at a time trying to execute something
|
||||
inst.length = 1
|
||||
break
|
||||
}
|
||||
this.PC += inst.length
|
||||
}
|
||||
}
|
||||
|
||||
export {
|
||||
FLAG_NEGATIVE, FLAG_HALT, FLAG_ABLAZE,
|
||||
Instructions,
|
||||
CPU,
|
||||
}
|
||||
|
|
@ -0,0 +1,32 @@
|
|||
|
||||
#instructions th.addr {
|
||||
text-align: right;
|
||||
color: brown;
|
||||
}
|
||||
|
||||
td.name {
|
||||
font-weight: bold;
|
||||
}
|
||||
|
||||
td.args {
|
||||
color: green;
|
||||
}
|
||||
|
||||
td.hex {
|
||||
color: #777;
|
||||
}
|
||||
|
||||
.ablaze {
|
||||
background: url(fire.gif) bottom repeat-x;
|
||||
}
|
||||
|
||||
@media screen and (min-width: 768px) {
|
||||
#cpu-box {
|
||||
max-height: 95vh;
|
||||
}
|
||||
|
||||
.table-container {
|
||||
max-height: calc(100% - 4em);
|
||||
overflow-y: scroll;
|
||||
}
|
||||
}
|
||||
|
|
@ -0,0 +1,206 @@
|
|||
import * as Binutils from "./binutils.mjs"
|
||||
import * as Triscit from "./triscit.mjs"
|
||||
|
||||
const SamplePrograms = [
|
||||
`05 0d
|
||||
61 62 63 64 65 66 67 68 69 6a 00
|
||||
02 02
|
||||
01 02
|
||||
06
|
||||
`,
|
||||
`05 31
|
||||
61 62 63 64 65 66 67 68 69 6a 00
|
||||
70 61 73 73 77 6f 72 64 00
|
||||
53 75 70 65 72 20 53 65 63 72 65 74 00
|
||||
53 6f 72 72 79 2c 20 77 72 6f 6e 67 2e 00
|
||||
02 02
|
||||
03 02 0d
|
||||
04 3b
|
||||
01 16
|
||||
06
|
||||
01 23
|
||||
06
|
||||
`
|
||||
]
|
||||
|
||||
function fill(element, values) {
|
||||
for (let e of element.querySelectorAll("[data-fill]")) {
|
||||
e.textContent = values[e.dataset.fill]
|
||||
}
|
||||
}
|
||||
|
||||
class UI {
|
||||
constructor(program=[]) {
|
||||
this.program = program
|
||||
this.Init()
|
||||
this.Reset()
|
||||
}
|
||||
|
||||
Init() {
|
||||
for (let e of document.querySelectorAll("[data-control]")) {
|
||||
switch (e.dataset.control) {
|
||||
case "step":
|
||||
e.addEventListener("click", () => this.Step())
|
||||
break
|
||||
case "back":
|
||||
e.addEventListener("click", () => this.Unstep())
|
||||
break
|
||||
case "reset":
|
||||
e.addEventListener("click", () => this.Reset())
|
||||
break
|
||||
case "input":
|
||||
e.addEventListener("input", () => this.SetInput())
|
||||
break
|
||||
case "program":
|
||||
e.addEventListener("input", () => this.SetProgram())
|
||||
}
|
||||
}
|
||||
|
||||
let ih = document.querySelector("#instructions-help")
|
||||
for (let i = 0; i < Triscit.Instructions.length; i++) {
|
||||
let inst = Triscit.Instructions[i]
|
||||
let doc = document.querySelector("template#instruction-help").content.cloneNode(true)
|
||||
let tr = doc.firstElementChild
|
||||
fill(tr, {
|
||||
num: Binutils.Hexlify([i]),
|
||||
args: inst.Args.join(" "),
|
||||
name: inst.Name,
|
||||
description: inst.Description,
|
||||
})
|
||||
ih.appendChild(doc)
|
||||
}
|
||||
|
||||
let fields = new URLSearchParams(window.location.search);
|
||||
let progNumber = fields.get("p") || 0
|
||||
let progElement = document.querySelector('[data-control="program"]')
|
||||
let prog = SamplePrograms[progNumber]
|
||||
if (prog) {
|
||||
progElement.value = SamplePrograms[progNumber]
|
||||
progElement.parentElement.classList.add("is-hidden")
|
||||
}
|
||||
|
||||
this.SetInput()
|
||||
this.SetProgram()
|
||||
}
|
||||
|
||||
Reset() {
|
||||
this.cpu = new Triscit.CPU(this.program, this.input)
|
||||
this.stack = []
|
||||
this.Refresh()
|
||||
}
|
||||
|
||||
Refresh() {
|
||||
let inste = document.querySelector("#instructions")
|
||||
while (inste.firstChild) inste.firstChild.remove()
|
||||
for (let i of this.cpu.DisassembleProgram()) {
|
||||
let doc = document.querySelector("template#instruction").content.cloneNode(true)
|
||||
let tr = doc.firstElementChild
|
||||
fill(tr, {
|
||||
addr: Binutils.Hexlify([i.addr]),
|
||||
name: i.name,
|
||||
hex: Binutils.Hexlify(i.buf),
|
||||
})
|
||||
|
||||
let args = tr.querySelector(".args")
|
||||
for (let a of i.args) {
|
||||
if (! isNaN(a)) {
|
||||
a = Binutils.Hexlify([a])
|
||||
}
|
||||
args.textContent += `${a} `
|
||||
}
|
||||
|
||||
inste.appendChild(tr)
|
||||
if (i.addr == this.cpu.PC) {
|
||||
tr.classList.add("is-selected")
|
||||
tr.scrollIntoView(false)
|
||||
// let top = tr.offsetTop
|
||||
// let parent = tr.parentElement
|
||||
|
||||
// tr.parentElement.scrollTop = top
|
||||
}
|
||||
}
|
||||
|
||||
for (let e of document.querySelectorAll("[data-flag]")) {
|
||||
let mask = 0
|
||||
let className = "is-info"
|
||||
switch (e.dataset.flag) {
|
||||
case "negative":
|
||||
mask = Triscit.FLAG_NEGATIVE
|
||||
break
|
||||
case "halt":
|
||||
mask = Triscit.FLAG_HALT
|
||||
break
|
||||
case "fire":
|
||||
mask = Triscit.FLAG_ABLAZE
|
||||
className = "is-danger"
|
||||
break
|
||||
}
|
||||
if (this.cpu.Flags & mask) {
|
||||
e.classList.add(className)
|
||||
} else {
|
||||
e.classList.remove(className)
|
||||
}
|
||||
}
|
||||
|
||||
for (let cpuBox of document.querySelectorAll("#cpu-box")) {
|
||||
if (this.cpu.Flags & Triscit.FLAG_ABLAZE) {
|
||||
cpuBox.classList.add("ablaze")
|
||||
} else {
|
||||
cpuBox.classList.remove("ablaze")
|
||||
}
|
||||
}
|
||||
|
||||
for (let e of document.querySelectorAll("[data-value]")) {
|
||||
switch (e.dataset.value) {
|
||||
case "pc":
|
||||
e.textContent = Binutils.Hexlify([this.cpu.PC])
|
||||
break
|
||||
case "output":
|
||||
e.textContent = Binutils.Stringify(this.cpu.Output)
|
||||
break
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
Step() {
|
||||
if (this.cpu.Flags & Triscit.FLAG_HALT) {
|
||||
return
|
||||
}
|
||||
this.stack.push(this.cpu)
|
||||
this.cpu = this.cpu.Clone()
|
||||
this.cpu.Step()
|
||||
this.Refresh()
|
||||
}
|
||||
|
||||
Unstep() {
|
||||
if (this.stack.length == 0) {
|
||||
return
|
||||
}
|
||||
this.cpu = this.stack.pop()
|
||||
this.Refresh()
|
||||
}
|
||||
|
||||
SetProgram() {
|
||||
let e =document.querySelector('[data-control="program"]')
|
||||
this.program = Binutils.Unhexlify(e.value || "")
|
||||
this.Reset()
|
||||
}
|
||||
|
||||
SetInput() {
|
||||
let e = document.querySelector('[data-control="input"]')
|
||||
let v = e.value || ""
|
||||
this.input = Binutils.Unescape(v)
|
||||
this.Reset()
|
||||
}
|
||||
}
|
||||
|
||||
function init() {
|
||||
let app = new UI()
|
||||
window.app = app
|
||||
}
|
||||
|
||||
if (document.readyState === "loading") {
|
||||
document.addEventListener("DOMContentLoaded", init)
|
||||
} else {
|
||||
init()
|
||||
}
|
||||
Loading…
Reference in New Issue