825 lines
23 KiB
JavaScript
825 lines
23 KiB
JavaScript
"use strict";
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CPU.prototype.debug_init = function()
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{
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var cpu = this;
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var debug = {};
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this.debug = debug;
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/**
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* wheter or not in step mode
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* used for debugging
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* @type {boolean}
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*/
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debug.step_mode = false;
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debug.ops = undefined;
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debug.all_ops = [];
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debug.trace_all = false;
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// "log" some information visually to the user.
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// Also in non-DEBUG modes
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debug.show = function(x)
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{
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if(typeof document !== "undefined")
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{
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var el = document.getElementById("log");
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if(el)
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{
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el.textContent += x + "\n";
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el.style.display = "block";
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el.scrollTop = 1e9;
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return;
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}
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}
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console.log(x);
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};
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debug.init = function()
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{
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if(!DEBUG) return;
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// used for debugging
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debug.ops = new CircularQueue(200000);
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if(cpu.io)
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{
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// write seabios debug output to console
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var seabios_debug = "";
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cpu.io.register_write(0x402, this, handle); // seabios
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cpu.io.register_write(0x500, this, handle); // vgabios
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}
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function handle(out_byte)
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{
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if(out_byte === 10)
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{
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dbg_log(seabios_debug, LOG_BIOS);
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seabios_debug = "";
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}
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else
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{
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seabios_debug += String.fromCharCode(out_byte);
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}
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}
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};
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debug.get_regs_short = get_regs_short;
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debug.dump_regs = dump_regs_short;
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debug.dump_instructions = dump_instructions;
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debug.get_instructions = get_instructions;
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debug.get_state = get_state;
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debug.dump_state = dump_state;
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debug.dump_stack = dump_stack;
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debug.dump_page_directory = dump_page_directory;
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debug.dump_gdt_ldt = dump_gdt_ldt;
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debug.dump_idt = dump_idt;
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debug.get_memory_dump = get_memory_dump;
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debug.memory_hex_dump = memory_hex_dump;
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debug.used_memory_dump = used_memory_dump;
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debug.step = step;
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debug.run_until = run_until;
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/**
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* @param {string=} msg
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*/
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debug.unimpl = function(msg)
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{
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var s = "Unimplemented" + (msg ? ": " + msg : "");
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debug.show(s);
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if(DEBUG)
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{
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console.trace();
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return s;
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}
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else
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{
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debug.show("Execution stopped");
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return s;
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}
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//this.name = "Unimplemented";
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};
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function step()
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{
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if(!DEBUG) return;
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if(!cpu.running)
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{
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cpu.cycle();
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}
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dump_regs_short();
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var now = Date.now();
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cpu.running = false;
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dump_instructions();
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}
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function run_until()
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{
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if(!DEBUG) return;
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cpu.running = false;
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var a = parseInt(prompt("input hex", ""), 16);
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if(a) while(cpu.instruction_pointer[0] != a) step();
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}
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// http://ref.x86asm.net/x86reference.xml
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// for debugging purposes
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var opcode_map = [
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"ADD", "ADD", "ADD", "ADD", "ADD", "ADD", "PUSH", "POP",
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"OR", "OR", "OR", "OR", "OR", "OR", "PUSH", "0F:",
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"ADC", "ADC", "ADC", "ADC", "ADC", "ADC", "PUSH", "POP",
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"SBB", "SBB", "SBB", "SBB", "SBB", "SBB", "PUSH", "POP",
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"AND", "AND", "AND", "AND", "AND", "AND", "ES", "DAA",
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"SUB", "SUB", "SUB", "SUB", "SUB", "SUB", "CS", "DAS",
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"XOR", "XOR", "XOR", "XOR", "XOR", "XOR", "SS", "AAA",
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"CMP", "CMP", "CMP", "CMP", "CMP", "CMP", "DS", "AAS",
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"INC", "INC", "INC", "INC", "INC", "INC", "INC", "INC",
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"DEC", "DEC", "DEC", "DEC", "DEC", "DEC", "DEC", "DEC",
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"PUSH", "PUSH", "PUSH", "PUSH", "PUSH", "PUSH", "PUSH", "PUSH",
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"POP", "POP", "POP", "POP", "POP", "POP", "POP", "POP",
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"PUSHA", "POPA", "BOUND", "ARPL", "FS", "GS", "none", "none",
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"PUSH", "IMUL", "PUSH", "IMUL", "INS", "INS", "OUTS", "OUTS",
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"JO", "JNO", "JB", "JNB", "JZ", "JNZ", "JBE", "JNBE",
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"JS", "JNS", "JP", "JNP", "JL", "JNL", "JLE", "JNLE",
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"ADD", "ADD", "ADD", "ADD", "TEST", "TEST", "XCHG", "XCHG",
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"MOV", "MOV", "MOV", "MOV", "MOV", "LEA", "MOV", "POP",
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"NOP", "XCHG", "XCHG", "XCHG", "XCHG", "XCHG", "XCHG", "XCHG",
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"CBW", "CWD", "CALLF", "FWAIT", "PUSHF", "POPF", "SAHF", "LAHF",
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"MOV", "MOV", "MOV", "MOV", "MOVS", "MOVS", "CMPS", "CMPS",
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"TEST", "TEST", "STOS", "STOS", "LODS", "LODS", "SCAS", "SCAS",
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"MOV", "MOV", "MOV", "MOV", "MOV", "MOV", "MOV", "MOV",
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"MOV", "MOV", "MOV", "MOV", "MOV", "MOV", "MOV", "MOV",
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"ROL", "ROL", "RETN", "RETN", "LES", "LDS", "MOV", "MOV",
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"ENTER", "LEAVE", "RETF", "RETF", "INT", "INT", "INTO", "IRET",
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"ROL", "ROL", "ROL", "ROL", "AAM", "AAD", "none", "XLAT",
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"FADD", "FLD", "FIADD", "FILD", "FADD", "FLD", "FIADD", "FILD",
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"LOOPNZ", "LOOPZ", "LOOP", "JCXZ", "IN", "IN", "OUT", "OUT",
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"CALL", "JMP", "JMPF", "JMP", "IN", "IN", "OUT", "OUT",
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"LOCK", "none", "REPNZ", "REPZ", "HLT", "CMC", "TEST", "TEST",
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"CLC", "STC", "CLI", "STI", "CLD", "STD", "INC", "INC"
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];
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debug.logop = function(_ip, op)
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{
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if(!DEBUG || !debug.step_mode)
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{
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return;
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}
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_ip = _ip >>> 0;
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if(debug.trace_all && debug.all_ops)
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{
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debug.all_ops.push(_ip, op);
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}
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else if(debug.ops)
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{
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debug.ops.add(_ip);
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debug.ops.add(op);
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}
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};
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function dump_stack(start, end)
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{
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if(!DEBUG) return;
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var esp = cpu.reg32[reg_esp];
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dbg_log("========= STACK ==========");
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if(end >= start || end === undefined)
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{
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start = 5;
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end = -5;
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}
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for(var i = start; i > end; i--)
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{
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var line = " ";
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if(!i) line = "=> ";
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line += h(i, 2) + " | ";
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dbg_log(line + h(esp + 4 * i, 8) + " | " + h(cpu.read32s(esp + 4 * i) >>> 0));
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}
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}
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function get_state(where)
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{
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if(!DEBUG) return;
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var mode = cpu.protected_mode[0] ? "prot" : "real";
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var vm = (cpu.flags[0] & flag_vm) ? 1 : 0;
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var flags = cpu.get_eflags();
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var iopl = cpu.getiopl();
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var cpl = cpu.cpl[0];
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var cs_eip = h(cpu.sreg[reg_cs], 4) + ":" + h(cpu.get_real_eip() >>> 0, 8);
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var ss_esp = h(cpu.sreg[reg_ss], 4) + ":" + h(cpu.reg32[reg_es] >>> 0, 8);
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var op_size = cpu.is_32[0] ? "32" : "16";
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var if_ = (cpu.flags[0] & flag_interrupt) ? 1 : 0;
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var flag_names = {
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[flag_carry]: "c",
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[flag_parity]: "p",
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[flag_adjust]: "a",
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[flag_zero]: "z",
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[flag_sign]: "s",
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[flag_trap]: "t",
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[flag_interrupt]: "i",
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[flag_direction]: "d",
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[flag_overflow]: "o",
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};
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var flag_string = "";
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for(var i = 0; i < 16; i++)
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{
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if(flag_names[1 << i])
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{
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if(flags & 1 << i)
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{
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flag_string += flag_names[1 << i];
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}
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else
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{
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flag_string += " ";
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}
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}
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}
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return ("mode=" + mode + "/" + op_size + " paging=" + (+((cpu.cr[0] & CR0_PG) !== 0)) +
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" iopl=" + iopl + " cpl=" + cpl + " if=" + if_ + " cs:eip=" + cs_eip +
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" cs_off=" + h(cpu.get_seg_cs() >>> 0, 8) +
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" flgs=" + h(cpu.get_eflags() >>> 0, 6) + " (" + flag_string + ")" +
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" ss:esp=" + ss_esp +
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" ssize=" + (+cpu.stack_size_32[0]) +
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(where ? " in " + where : ""));
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}
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function dump_state(where)
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{
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if(!DEBUG) return;
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dbg_log(get_state(where), LOG_CPU);
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}
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function get_regs_short()
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{
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var
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r32 = { "eax": reg_eax, "ecx": reg_ecx, "edx": reg_edx, "ebx": reg_ebx,
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"esp": reg_esp, "ebp": reg_ebp, "esi": reg_esi, "edi": reg_edi },
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r32_names = ["eax", "ecx", "edx", "ebx", "esp", "ebp", "esi", "edi"],
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s = { "cs": reg_cs, "ds": reg_ds, "es": reg_es, "fs": reg_fs, "gs": reg_gs, "ss": reg_ss },
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line1 = "",
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line2 = "";
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for(var i = 0; i < 4; i++)
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{
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line1 += r32_names[i] + "=" + h(cpu.reg32[r32[r32_names[i]]] >>> 0, 8) + " ";
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line2 += r32_names[i+4] + "=" + h(cpu.reg32[r32[r32_names[i+4]]] >>> 0, 8) + " ";
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}
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//line1 += " eip=" + h(cpu.get_real_eip() >>> 0, 8);
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//line2 += " flg=" + h(cpu.get_eflags(), 8);
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line1 += " ds=" + h(cpu.sreg[reg_ds], 4) + " es=" + h(cpu.sreg[reg_es], 4) + " fs=" + h(cpu.sreg[reg_fs], 4);
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line2 += " gs=" + h(cpu.sreg[reg_gs], 4) + " cs=" + h(cpu.sreg[reg_cs], 4) + " ss=" + h(cpu.sreg[reg_ss], 4);
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return [line1, line2];
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}
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function dump_regs_short()
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{
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if(!DEBUG) return;
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var lines = get_regs_short();
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dbg_log(lines[0], LOG_CPU);
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dbg_log(lines[1], LOG_CPU);
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}
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function get_instructions()
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{
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if(!DEBUG) return;
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debug.step_mode = true;
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function add(ip, op)
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{
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out += h(ip, 8) + ": " +
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v86util.pads(opcode_map[op] || "unkown", 20) + h(op, 2) + "\n";
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}
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var opcodes;
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var out = "";
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if(debug.trace_all && debug.all_ops)
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{
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opcodes = debug.all_ops;
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}
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else if(debug.ops)
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{
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opcodes = debug.ops.toArray();
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}
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if(!opcodes)
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{
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return "";
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}
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for(var i = 0; i < opcodes.length; i += 2)
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{
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add(opcodes[i], opcodes[i + 1]);
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}
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debug.ops.clear();
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debug.all_ops = [];
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return out;
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}
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function dump_instructions()
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{
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if(!DEBUG) return;
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debug.show(get_instructions());
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}
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function dump_gdt_ldt()
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{
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if(!DEBUG) return;
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dbg_log("gdt: (len = " + h(cpu.gdtr_size[0]) + ")");
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dump_table(cpu.translate_address_system_read(cpu.gdtr_offset[0]), cpu.gdtr_size[0]);
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dbg_log("\nldt: (len = " + h(cpu.segment_limits[reg_ldtr]) + ")");
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dump_table(cpu.translate_address_system_read(cpu.segment_offsets[reg_ldtr]), cpu.segment_limits[reg_ldtr]);
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function dump_table(addr, size)
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{
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for(var i = 0; i < size; i += 8, addr += 8)
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{
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var base = cpu.read16(addr + 2) |
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cpu.read8(addr + 4) << 16 |
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cpu.read8(addr + 7) << 24,
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limit = cpu.read16(addr) | (cpu.read8(addr + 6) & 0xF) << 16,
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access = cpu.read8(addr + 5),
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flags = cpu.read8(addr + 6) >> 4,
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flags_str = "",
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dpl = access >> 5 & 3;
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if(!(access & 128))
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{
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// present bit not set
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//continue;
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flags_str += "NP ";
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}
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else
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{
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flags_str += " P ";
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}
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if(access & 16)
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{
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if(flags & 4)
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{
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flags_str += "32b ";
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}
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else
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{
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flags_str += "16b ";
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}
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if(access & 8)
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{
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// executable
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flags_str += "X ";
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if(access & 4)
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{
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flags_str += "C ";
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}
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}
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else
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{
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// data
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flags_str += "R ";
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}
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flags_str += "RW ";
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}
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else
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{
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// system
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flags_str += "sys: " + h(access & 15);
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}
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if(flags & 8)
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{
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limit = limit << 12 | 0xFFF;
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}
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dbg_log(h(i & ~7, 4) + " " + h(base >>> 0, 8) + " (" + h(limit >>> 0, 8) + " bytes) " +
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flags_str + "; dpl = " + dpl + ", a = " + access.toString(2) +
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", f = " + flags.toString(2));
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}
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}
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}
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function dump_idt()
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{
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if(!DEBUG) return;
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for(var i = 0; i < cpu.idtr_size[0]; i += 8)
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{
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var addr = cpu.translate_address_system_read(cpu.idtr_offset[0] + i),
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base = cpu.read16(addr) | cpu.read16(addr + 6) << 16,
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selector = cpu.read16(addr + 2),
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type = cpu.read8(addr + 5),
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line,
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dpl = type >> 5 & 3;
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if((type & 31) === 5)
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{
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line = "task gate ";
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}
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else if((type & 31) === 14)
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{
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line = "intr gate ";
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}
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else if((type & 31) === 15)
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{
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line = "trap gate ";
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}
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else
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{
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line = "invalid ";
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}
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if(type & 128)
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{
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line += " P";
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}
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else
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{
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// present bit not set
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//continue;
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line += "NP";
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}
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dbg_log(h(i >> 3, 4) + " " + h(base >>> 0, 8) + ", " +
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h(selector, 4) + "; " + line + "; dpl = " + dpl + ", t = " + type.toString(2));
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}
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}
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function load_page_entry(dword_entry, is_directory)
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{
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if(!DEBUG) return;
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if(!(dword_entry & 1))
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{
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// present bit not set
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return false;
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}
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var size = (dword_entry & 128) === 128,
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address;
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if(size && !is_directory)
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{
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address = dword_entry & 0xFFC00000;
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}
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else
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{
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address = dword_entry & 0xFFFFF000;
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}
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return {
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size: size,
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global: (dword_entry & 256) === 256,
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accessed: (dword_entry & 0x20) === 0x20,
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dirty: (dword_entry & 0x40) === 0x40,
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cache_disable : (dword_entry & 16) === 16,
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user : (dword_entry & 4) === 4,
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read_write : (dword_entry & 2) === 2,
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address : address >>> 0
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};
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}
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function dump_page_directory()
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{
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if(!DEBUG) return;
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for(var i = 0; i < 1024; i++)
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{
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|
var addr = cpu.cr[3] + 4 * i;
|
|
var dword = cpu.read32s(addr),
|
|
entry = load_page_entry(dword, true);
|
|
|
|
if(!entry)
|
|
{
|
|
dbg_log("Not present: " + h((i << 22) >>> 0, 8));
|
|
continue;
|
|
}
|
|
|
|
var flags = "";
|
|
|
|
flags += entry.size ? "S " : " ";
|
|
flags += entry.accessed ? "A " : " ";
|
|
flags += entry.cache_disable ? "Cd " : " ";
|
|
flags += entry.user ? "U " : " ";
|
|
flags += entry.read_write ? "Rw " : " ";
|
|
|
|
if(entry.size)
|
|
{
|
|
dbg_log("=== " + h((i << 22) >>> 0, 8) + " -> " + h(entry.address >>> 0, 8) + " | " + flags);
|
|
continue;
|
|
}
|
|
else
|
|
{
|
|
dbg_log("=== " + h((i << 22) >>> 0, 8) + " | " + flags);
|
|
}
|
|
|
|
for(var j = 0; j < 1024; j++)
|
|
{
|
|
var sub_addr = entry.address + 4 * j;
|
|
dword = cpu.read32s(sub_addr);
|
|
|
|
var subentry = load_page_entry(dword, false);
|
|
|
|
if(subentry)
|
|
{
|
|
flags = "";
|
|
|
|
flags += subentry.cache_disable ? "Cd " : " ";
|
|
flags += subentry.user ? "U " : " ";
|
|
flags += subentry.read_write ? "Rw " : " ";
|
|
flags += subentry.global ? "G " : " ";
|
|
flags += subentry.accessed ? "A " : " ";
|
|
flags += subentry.dirty ? "Di " : " ";
|
|
|
|
dbg_log("# " + h((i << 22 | j << 12) >>> 0, 8) + " -> " +
|
|
h(subentry.address, 8) + " | " + flags + " (at " + h(sub_addr, 8) + ")");
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
|
|
function get_memory_dump(start, count)
|
|
{
|
|
if(!DEBUG) return;
|
|
|
|
if(start === undefined)
|
|
{
|
|
start = 0;
|
|
count = cpu.memory_size[0];
|
|
}
|
|
else if(count === undefined)
|
|
{
|
|
count = start;
|
|
start = 0;
|
|
}
|
|
|
|
return cpu.mem8.slice(start, start + count).buffer;
|
|
}
|
|
|
|
|
|
function memory_hex_dump(addr, length)
|
|
{
|
|
if(!DEBUG) return;
|
|
|
|
length = length || 4 * 0x10;
|
|
var line, byt;
|
|
|
|
for(var i = 0; i < length >> 4; i++)
|
|
{
|
|
line = h(addr + (i << 4), 5) + " ";
|
|
|
|
for(var j = 0; j < 0x10; j++)
|
|
{
|
|
byt = cpu.read8(addr + (i << 4) + j);
|
|
line += h(byt, 2) + " ";
|
|
}
|
|
|
|
line += " ";
|
|
|
|
for(j = 0; j < 0x10; j++)
|
|
{
|
|
byt = cpu.read8(addr + (i << 4) + j);
|
|
line += (byt < 33 || byt > 126) ? "." : String.fromCharCode(byt);
|
|
}
|
|
|
|
dbg_log(line);
|
|
}
|
|
}
|
|
|
|
function used_memory_dump()
|
|
{
|
|
if(!DEBUG) return;
|
|
|
|
var width = 0x80,
|
|
height = 0x10,
|
|
block_size = cpu.memory_size[0] / width / height | 0,
|
|
row;
|
|
|
|
for(var i = 0; i < height; i++)
|
|
{
|
|
row = h(i * width * block_size, 8) + " | ";
|
|
|
|
for(var j = 0; j < width; j++)
|
|
{
|
|
var used = cpu.mem32s[(i * width + j) * block_size] > 0;
|
|
|
|
row += used ? "X" : " ";
|
|
}
|
|
|
|
dbg_log(row);
|
|
}
|
|
}
|
|
|
|
|
|
debug.debug_interrupt = function(interrupt_nr)
|
|
{
|
|
//if(interrupt_nr === 0x20)
|
|
//{
|
|
// //var vxd_device = cpu.safe_read16(cpu.instruction_pointer + 2);
|
|
// //var vxd_sub = cpu.safe_read16(cpu.instruction_pointer + 0);
|
|
// //var service = "";
|
|
// //if(vxd_device === 1)
|
|
// //{
|
|
// // service = vxd_table1[vxd_sub];
|
|
// //}
|
|
// //dbg_log("vxd: " + h(vxd_device, 4) + " " + h(vxd_sub, 4) + " " + service);
|
|
//}
|
|
|
|
//if(interrupt_nr >= 0x21 && interrupt_nr < 0x30)
|
|
//{
|
|
// dbg_log("dos: " + h(interrupt_nr, 2) + " ah=" + h(this.reg8[reg_ah], 2) + " ax=" + h(this.reg16[reg_ax], 4));
|
|
//}
|
|
|
|
//if(interrupt_nr === 0x13 && (this.reg8[reg_ah] | 1) === 0x43)
|
|
//{
|
|
// this.debug.memory_hex_dump(this.get_seg(reg_ds) + this.reg16[reg_si], 0x18);
|
|
//}
|
|
|
|
//if(interrupt_nr == 0x10)
|
|
//{
|
|
// dbg_log("int10 ax=" + h(this.reg16[reg_ax], 4) + " '" + String.fromCharCode(this.reg8[reg_al]) + "'");
|
|
// this.debug.dump_regs_short();
|
|
// if(this.reg8[reg_ah] == 0xe) vga.tt_write(this.reg8[reg_al]);
|
|
//}
|
|
|
|
//if(interrupt_nr === 0x13)
|
|
//{
|
|
// this.debug.dump_regs_short();
|
|
//}
|
|
|
|
//if(interrupt_nr === 6)
|
|
//{
|
|
// this.instruction_pointer += 2;
|
|
// dbg_log("BUG()", LOG_CPU);
|
|
// dbg_log("line=" + this.read_imm16() + " " +
|
|
// "file=" + this.read_string(this.translate_address_read(this.read_imm32s())), LOG_CPU);
|
|
// this.instruction_pointer -= 8;
|
|
// this.debug.dump_regs_short();
|
|
//}
|
|
|
|
//if(interrupt_nr === 0x80)
|
|
//{
|
|
// dbg_log("linux syscall");
|
|
// this.debug.dump_regs_short();
|
|
//}
|
|
|
|
//if(interrupt_nr === 0x40)
|
|
//{
|
|
// dbg_log("kolibri syscall");
|
|
// this.debug.dump_regs_short();
|
|
//}
|
|
};
|
|
|
|
let cs;
|
|
let capstone_decoder;
|
|
|
|
debug.dump_code = function(is_32, buffer, start)
|
|
{
|
|
if(!capstone_decoder)
|
|
{
|
|
if(cs === undefined)
|
|
{
|
|
if(typeof require === "function")
|
|
{
|
|
cs = require("./capstone-x86.min.js");
|
|
}
|
|
else
|
|
{
|
|
cs = window.cs;
|
|
}
|
|
|
|
if(cs === undefined)
|
|
{
|
|
dbg_log("Warning: Missing capstone library, disassembly not available");
|
|
return;
|
|
}
|
|
}
|
|
|
|
capstone_decoder = [
|
|
new cs.Capstone(cs.ARCH_X86, cs.MODE_16),
|
|
new cs.Capstone(cs.ARCH_X86, cs.MODE_32),
|
|
];
|
|
}
|
|
|
|
try
|
|
{
|
|
const instructions = capstone_decoder[is_32].disasm(buffer, start);
|
|
|
|
instructions.forEach(function (instr) {
|
|
dbg_log(h(instr.address >>> 0) + ": " +
|
|
v86util.pads(instr.bytes.map(x => h(x, 2).slice(-2)).join(" "), 20) + " " +
|
|
instr.mnemonic + " " + instr.op_str);
|
|
});
|
|
dbg_log("");
|
|
}
|
|
catch(e)
|
|
{
|
|
dbg_log("Could not disassemble: " + Array.from(buffer).map(x => h(x, 2)).join(" "));
|
|
}
|
|
};
|
|
|
|
function dump_file(ab, name)
|
|
{
|
|
var blob = new Blob([ab]);
|
|
|
|
var a = document.createElement("a");
|
|
a["download"] = name;
|
|
a.href = window.URL.createObjectURL(blob);
|
|
a.dataset["downloadurl"] = ["application/octet-stream", a["download"], a.href].join(":");
|
|
|
|
a.click();
|
|
window.URL.revokeObjectURL(a.src);
|
|
}
|
|
|
|
let wabt;
|
|
|
|
debug.dump_wasm = function(buffer)
|
|
{
|
|
if(wabt === undefined)
|
|
{
|
|
if(typeof require === "function")
|
|
{
|
|
wabt = require("./libwabt.js");
|
|
}
|
|
else
|
|
{
|
|
wabt = new window.WabtModule;
|
|
}
|
|
|
|
if(wabt === undefined)
|
|
{
|
|
dbg_log("Warning: Missing libwabt, wasm dump not available");
|
|
return;
|
|
}
|
|
}
|
|
|
|
// Need to make a small copy otherwise libwabt goes nuts trying to copy
|
|
// the whole underlying buffer
|
|
buffer = buffer.slice();
|
|
|
|
try
|
|
{
|
|
var module = wabt.readWasm(buffer, { readDebugNames: false });
|
|
module.generateNames();
|
|
module.applyNames();
|
|
const result = module.toText({ foldExprs: true, inlineExport: true });
|
|
dbg_log(result);
|
|
}
|
|
catch(e)
|
|
{
|
|
dump_file(buffer, "failed.wasm");
|
|
console.log(e.toString());
|
|
}
|
|
finally
|
|
{
|
|
if(module)
|
|
{
|
|
module.destroy();
|
|
}
|
|
}
|
|
};
|
|
};
|