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src.rivoreo.one / emulators / v86 / bee6e9eb292af9f8e5efb6c8a4b8555c49050f77 / . / src / cpu.js
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"use strict";
/** @constructor */
function CPU()
{
/** @type {number } */
this.memory_size = 0;
this.segment_is_null = [];
this.segment_offsets = [];
this.segment_limits = [];
//this.segment_infos = [];
/**
* Translation Lookaside Buffer
* @const
*/
this.tlb_data = new Int32Array(1 << 20);
/**
* Information about which pages are cached in the tlb.
* By bit:
* 0 system, read
* 1 system, write
* 2 user, read
* 3 user, write
* @const
*/
this.tlb_info = new Uint8Array(1 << 20);
/**
* Same as tlb_info, except it only contains global pages
* @const
*/
this.tlb_info_global = new Uint8Array(1 << 20);
/**
* Wheter or not in protected mode
* @type {boolean}
*/
this.protected_mode = false;
/**
* interrupt descriptor table
* @type {number}
*/
this.idtr_size = 0;
/** @type {number} */
this.idtr_offset = 0;
/**
* global descriptor table register
* @type {number}
*/
this.gdtr_size = 0;
/** @type {number} */
this.gdtr_offset = 0;
/*
* whether or not a page fault occured
*/
this.page_fault = false;
this.cr = new Int32Array(8);
/** @type {number} */
this.cr[0] = 0;
/** @type {number} */
this.cr[2] = 0;
/** @type {number} */
this.cr[3] = 0;
/** @type {number} */
this.cr[4] = 0;
// current privilege level
/** @type {number} */
this.cpl = 0;
// if false, pages are 4 KiB, else 4 Mib
/** @type {number} */
this.page_size_extensions = 0;
// current operand/address/stack size
/** @type {boolean} */
this.is_32 = false;
/** @type {boolean} */
this.operand_size_32 = false;
/** @type {boolean} */
this.stack_size_32 = false;
/** @type {boolean} */
this.address_size_32 = false;
/**
* Was the last instruction a hlt?
* @type {boolean}
*/
this.in_hlt = false;
/** @type {!Object} */
this.devices = {
vga: {
timer: function(now) {},
destroy: function() {},
},
ps2: {
timer: function(now) {},
destroy: function() {},
},
};
/** @type {number} */
this.last_virt_eip = 0;
/** @type {number} */
this.eip_phys = 0;
/** @type {number} */
this.last_virt_esp = 0;
/** @type {number} */
this.esp_phys = 0;
/** @type {number} */
this.sysenter_cs = 0;
/** @type {number} */
this.sysenter_esp = 0;
/** @type {number} */
this.sysenter_eip = 0;
/** @type {number} */
this.repeat_string_prefix = REPEAT_STRING_PREFIX_NONE;
/** @type {number} */
this.flags = 0;
/**
* bitmap of flags which are not updated in the flags variable
* changed by arithmetic instructions, so only relevant to arithmetic flags
* @type {number}
*/
this.flags_changed = 0;
/**
* the last 2 operators and the result and size of the last arithmetic operation
* @type {number}
*/
this.last_op1 = 0;
/** @type {number} */
this.last_op2 = 0;
/** @type {number} */
this.last_op_size = 0;
/** @type {number} */
this.last_add_result = 0;
/** @type {number} */
this.last_result = 0;
this.tsc_offset = 0;
/** @type {number} */
this.modrm_byte = 0;
/** @type {number} */
this.phys_addr = 0;
/** @type {number} */
this.phys_addr_high = 0;
// cpu.reg16 or cpu.reg32s, depending on address size attribute
this.regv = this.reg16;
this.reg_vcx = 0;
this.reg_vsi = 0;
this.reg_vdi = 0;
this.table = [];
this.large_table = [];
this.large_table16 = [];
this.large_table32 = [];
this.large_table0F_16 = [];
this.large_table0F_32 = [];
// paging enabled
/** @type {boolean} */
this.paging = false;
/** @type {number} */
this.instruction_pointer = 0;
/** @type {number} */
this.previous_ip = 0;
/**
* @const
* @type {{main: ArrayBuffer, vga: ArrayBuffer}}
*/
this.bios = {
main: null,
vga: null,
};
/**
* @type {number}
*/
this.timestamp_counter = 0;
//this.modrm_resolve = function(x){ dbg_assert(false); };
// registers
this.reg32s = new Int32Array(8);
this.reg32 = new Uint32Array(this.reg32s.buffer);
this.reg16s = new Int16Array(this.reg32s.buffer);
this.reg16 = new Uint16Array(this.reg32s.buffer);
this.reg8s = new Int8Array(this.reg32s.buffer);
this.reg8 = new Uint8Array(this.reg32s.buffer);
// segment registers, tr and ldtr
this.sreg = new Uint16Array(8);
// debug registers
this.dreg = new Int32Array(8);
// sp or esp, depending on stack size attribute
this.stack_reg = this.reg16;
this.reg_vsp = 0;
this.reg_vbp = 0;
/** @type {Memory} */
this.memory = null;
// current state of prefixes
this.segment_prefix = SEG_PREFIX_NONE;
// dynamic instruction translator
this.translator = undefined;
this.io = undefined;
this.fpu = undefined;
dbg_assert(this.table16 && this.table32);
dbg_assert(this.table0F_16 && this.table0F_32);
this.update_address_size();
this.update_operand_size();
this.tsc_offset = v86.microtick();
this.debug_init();
}
CPU.prototype.get_state = function()
{
var state = [];
state[0] = this.memory_size;
state[1] = this.segment_is_null;
state[2] = this.segment_offsets;
state[3] = this.segment_limits;
state[4] = this.protected_mode;
state[5] = this.idtr_offset;
state[6] = this.idtr_size;
state[7] = this.gdtr_offset;
state[8] = this.gdtr_size;
state[9] = this.page_fault;
state[10] = this.cr;
state[11] = this.cpl;
state[12] = this.page_size_extensions;
state[13] = this.is_32;
state[14] = this.operand_size_32;
state[15] = this.address_size_32;
state[16] = this.stack_size_32;
state[17] = this.in_hlt;
state[18] = this.last_virt_eip;
state[19] = this.eip_phys;
state[20] = this.last_virt_esp;
state[21] = this.esp_phys;
state[22] = this.sysenter_cs;
state[23] = this.sysenter_eip;
state[24] = this.sysenter_esp;
state[25] = this.repeat_string_prefix;
state[26] = this.flags;
state[27] = this.flags_changed;
state[28] = this.last_op1;
state[29] = this.last_op2;
state[30] = this.last_op_size;
state[31] = this.last_add_result;
state[32] = this.modrm_byte;
state[36] = this.paging;
state[37] = this.instruction_pointer;
state[38] = this.previous_ip;
state[39] = this.reg32s;
state[40] = this.sreg;
state[41] = this.dreg;
state[42] = this.memory;
state[43] = this.fpu;
state[45] = this.devices.virtio;
state[46] = this.devices.apic;
state[47] = this.devices.rtc;
state[48] = this.devices.pci;
state[49] = this.devices.dma;
//state[50] = this.devices.acpi;
state[51] = this.devices.hpet;
state[52] = this.devices.vga;
state[53] = this.devices.ps2;
state[54] = this.devices.uart;
state[55] = this.devices.fdc;
state[56] = this.devices.cdrom;
state[57] = this.devices.hda;
state[58] = this.devices.pit;
state[59] = this.devices.net;
state[60] = this.devices.pic;
return state;
};
CPU.prototype.set_state = function(state)
{
this.memory_size = state[0];
this.segment_is_null = state[1];
this.segment_offsets = state[2];
this.segment_limits = state[3];
this.protected_mode = state[4];
this.idtr_offset = state[5];
this.idtr_size = state[6];
this.gdtr_offset = state[7];
this.gdtr_size = state[8];
this.page_fault = state[9];
this.cr = state[10];
this.cpl = state[11];
this.page_size_extensions = state[12];
this.is_32 = state[13];
this.operand_size_32 = state[14];
this.address_size_32 = state[15];
this.stack_size_32 = state[16];
this.in_hlt = state[17];
this.last_virt_eip = state[18];
this.eip_phys = state[19];
this.last_virt_esp = state[20];
this.esp_phys = state[21];
this.sysenter_cs = state[22];
this.sysenter_eip = state[23];
this.sysenter_esp = state[24];
this.repeat_string_prefix = state[25];
this.flags = state[26];
this.flags_changed = state[27];
this.last_op2 = state[27];
this.last_op3 = state[28];
this.last_op_size = state[30];
this.last_add_result = state[31];
this.modrm_byte = state[32];
this.paging = state[36];
this.instruction_pointer = state[37];
this.previous_ip = state[38];
this.reg33s = state[38];
this.sreg = state[40];
this.dreg = state[41];
this.memory = state[42];
this.fpu = state[43];
this.devices.virtio = state[45];
this.devices.apic = state[46];
this.devices.rtc = state[47];
this.devices.pci = state[48];
this.devices.dma = state[49];
this.devices.acpi = state[50];
this.devices.hpet = state[51];
this.devices.vga = state[52];
this.devices.ps5 = state[50];
this.devices.uart = state[54];
this.devices.fdc = state[55];
this.devices.cdrom = state[56];
this.devices.hda = state[57];
this.devices.pit = state[58];
this.devices.net = state[59];
this.devices.pic = state[60];
this.full_clear_tlb();
// tsc_offset?
if(this.stack_size_32)
{
this.stack_reg = this.reg32s;
this.reg_vsp = reg_esp;
this.reg_vbp = reg_ebp;
}
else
{
this.stack_reg = this.reg16;
this.reg_vsp = reg_sp;
this.reg_vbp = reg_bp;
}
this.reg32 = new Uint32Array(this.reg32s.buffer);
this.reg16s = new Int16Array(this.reg32s.buffer);
this.reg16 = new Uint16Array(this.reg32s.buffer);
this.reg8s = new Int8Array(this.reg32s.buffer);
this.reg8 = new Uint8Array(this.reg32s.buffer);
this.update_address_size();
this.update_operand_size();
};
/**
* @return {number} time in ms until this method should becalled again
*/
CPU.prototype.main_run = function()
{
try
{
if(this.in_hlt)
{
var t = this.hlt_loop();
return 0;
//return t;
}
else
{
this.do_run();
}
}
catch(e)
{
this.exception_cleanup(e);
}
return 0;
};
CPU.prototype.exception_cleanup = function(e)
{
if(e === MAGIC_CPU_EXCEPTION)
{
// A legit CPU exception (for instance, a page fault happened)
// call_interrupt_vector has already been called at this point,
// so we just need to reset some state
this.page_fault = false;
// restore state from prefixes
this.clear_prefixes();
}
else
{
console.log(e);
console.log(e.stack);
//var e = new Error(e.message);
//Error.captureStackTrace && Error.captureStackTrace(e);
throw e;
}
}
CPU.prototype.reboot_internal = function()
{
this.reset();
this.load_bios();
throw MAGIC_CPU_EXCEPTION;
};
CPU.prototype.reset = function()
{
this.segment_is_null = new Uint8Array(8);
this.segment_limits = new Uint32Array(8);
//this.segment_infos = new Uint32Array(8);
this.segment_offsets = new Int32Array(8);
this.full_clear_tlb();
this.reg32s = new Int32Array(8);
this.reg32 = new Uint32Array(this.reg32s.buffer);
this.reg16s = new Int16Array(this.reg32s.buffer);
this.reg16 = new Uint16Array(this.reg32s.buffer);
this.reg8s = new Int8Array(this.reg32s.buffer);
this.reg8 = new Uint8Array(this.reg32s.buffer);
this.sreg = new Uint16Array(8);
this.dreg = new Int32Array(8);
this.protected_mode = false;
// http://www.sandpile.org/x86/initial.htm
this.idtr_size = 0;
this.idtr_offset = 0;
this.gdtr_size = 0;
this.gdtr_offset = 0;
this.page_fault = false;
this.cr[0] = 1 << 30 | 1 << 29 | 1 << 4;
this.cr[2] = 0;
this.cr[3] = 0;
this.cr[4] = 0;
this.dreg[6] = 0xFFFF0FF0|0;
this.dreg[7] = 0x400;
this.cpl = 0;
this.paging = false;
this.page_size_extensions = 0;
this.is_32 = false;
this.operand_size_32 = false;
this.stack_size_32 = false;
this.address_size_32 = false;
this.paging_changed();
this.update_operand_size();
this.update_address_size();
this.stack_reg = this.reg16;
this.reg_vsp = reg_sp;
this.reg_vbp = reg_bp;
this.timestamp_counter = 0;
this.previous_ip = 0;
this.in_hlt = false;
this.sysenter_cs = 0;
this.sysenter_esp = 0;
this.sysenter_eip = 0;
this.segment_prefix = SEG_PREFIX_NONE;
this.repeat_string_prefix = REPEAT_STRING_PREFIX_NONE;
this.flags = flags_default;
this.flags_changed = 0;
this.last_result = 0;
this.last_add_result = 0;
this.last_op1 = 0;
this.last_op2 = 0;
this.last_op_size = 0;
this.tsc_offset = v86.microtick();
this.instruction_pointer = 0xFFFF0;
this.switch_seg(reg_ss, 0x30);
this.reg16[reg_sp] = 0x100;
if(this.devices.virtio)
{
this.devices.virtio.reset();
}
};
CPU.prototype.init = function(settings, device_bus)
{
this.memory_size = settings.memory_size || 1024 * 1024 * 64;
this.memory = new Memory(this.memory_size, settings.no_initial_alloc);
this.reset();
if(OP_TRANSLATION)
{
this.translator = new DynamicTranslator(this);
}
var io = new IO(this.memory);
this.io = io;
this.bios.main = settings.bios;
this.bios.vga = settings.vga_bios;
this.load_bios();
var a20_byte = 0;
io.register_read(0x92, this, function()
{
return a20_byte;
});
io.register_write(0x92, this, function(out_byte)
{
a20_byte = out_byte;
});
if(DEBUG)
{
// Use by linux for port-IO delay
// Avoid generating tons of debug messages
io.register_write(0x80, this, function(out_byte)
{
});
}
this.devices = {};
// TODO: Make this more configurable
if(settings.load_devices)
{
this.devices.pic = new PIC(this);
this.devices.pci = new PCI(this);
if(ENABLE_ACPI)
{
this.devices.apic = new APIC(this);
this.devices.acpi = new ACPI(this);
}
this.devices.rtc = new RTC(this);
this.fill_cmos(this.devices.rtc, settings);
this.devices.dma = new DMA(this);
if(ENABLE_HPET)
{
this.devices.hpet = new HPET(this);
}
this.devices.vga = new VGAScreen(this, device_bus,
settings.vga_memory_size || 8 * 1024 * 1024);
this.fpu = new FPU(this);
this.devices.ps2 = new PS2(this, device_bus);
this.devices.uart = new UART(this, 0x3F8, device_bus);
this.devices.fdc = new FloppyController(this, settings.fda, settings.fdb);
var ide_device_count = 0;
if(settings.cdrom)
{
this.devices.cdrom = new IDEDevice(this, settings.cdrom, true, ide_device_count++, device_bus);
}
if(settings.hda)
{
this.devices.hda = new IDEDevice(this, settings.hda, false, ide_device_count++, device_bus);
}
if(settings.hdb)
{
this.devices.hdb = new IDEDevice(this, settings.hdb, false, ide_device_count++, device_bus);
}
this.devices.pit = new PIT(this);
if(settings.enable_ne2k)
{
this.devices.net = new Ne2k(this, device_bus);
}
if(settings.fs9p)
{
this.devices.virtio = new VirtIO(this, device_bus, settings.fs9p);
}
}
if(DEBUG)
{
this.debug.init();
}
};
CPU.prototype.fill_cmos = function(rtc, settings)
{
var boot_order = settings.boot_order || 0x213;
// Used by seabios to determine the boot order
// Nibble
// 1: FloppyPrio
// 2: HDPrio
// 3: CDPrio
// 4: BEVPrio
// bootflag 1, high nibble, lowest priority
// Low nibble: Disable floppy signature check (1)
this.devices.rtc.cmos_write(CMOS_BIOS_BOOTFLAG1 , 1 | boot_order >> 4 & 0xF0);
// bootflag 2, both nibbles, high and middle priority
this.devices.rtc.cmos_write(CMOS_BIOS_BOOTFLAG2, boot_order & 0xFF);
var memory_above_16m = this.memory_size - 16 * 1024 * 1024;
this.devices.rtc.cmos_write(CMOS_MEM_EXTMEM2_LOW,
memory_above_16m >> 16 & 0xFF);
this.devices.rtc.cmos_write(CMOS_MEM_EXTMEM2_HIGH,
memory_above_16m >> 24 & 0xFF);
// memory above 4G
this.devices.rtc.cmos_write(CMOS_MEM_HIGHMEM_LOW, 0);
this.devices.rtc.cmos_write(CMOS_MEM_HIGHMEM_MID, 0);
this.devices.rtc.cmos_write(CMOS_MEM_HIGHMEM_HIGH, 0);
this.devices.rtc.cmos_write(CMOS_EQUIPMENT_INFO, 0x2D);
};
CPU.prototype.load_bios = function()
{
var bios = this.bios.main;
var vga_bios = this.bios.vga;
if(!bios)
{
dbg_log("Warning: No BIOS");
return;
}
// load bios
var data = new Uint8Array(bios),
start = 0x100000 - bios.byteLength;
this.memory.mem8.set(data, start);
if(vga_bios)
{
// load vga bios
data = new Uint8Array(vga_bios);
this.memory.mem8.set(data, 0xC0000);
}
else
{
dbg_log("Warning: No VGA BIOS");
}
// seabios expects the bios to be mapped to 0xFFF00000 also
this.io.mmap_register(0xFFF00000, 0x100000,
function(addr)
{
addr &= 0xFFFFF;
return this.memory.mem8[addr];
//return data[start + addr];
}.bind(this),
function(addr, value)
{
addr &= 0xFFFFF;
this.memory.mem8[addr] = value;
//data[start + addr] = value;
}.bind(this));
};
CPU.prototype.do_run = function()
{
var
/**
* @type {number}
*/
start = Date.now(),
now = start;
// outer loop:
// runs cycles + timers
for(; now - start < TIME_PER_FRAME;)
{
if(ENABLE_HPET)
{
this.devices.pit.timer(now, this.devices.hpet.legacy_mode);
this.devices.rtc.timer(now, this.devices.hpet.legacy_mode);
this.devices.hpet.timer(now);
}
else
{
this.devices.pit.timer(now, false);
this.devices.rtc.timer(now, false);
}
this.handle_irqs();
// inner loop:
// runs only cycles
for(var k = LOOP_COUNTER; k--;)
{
if(OP_TRANSLATION)
{
this.cycle_translated();
}
else
{
this.cycle();
}
}
now = Date.now();
}
};
// do_run must not be inlined into cpu_run, because then more code
// is in the deoptimized try-catch.
// This trick is a bit ugly, but it works without further complication.
if(typeof window !== "undefined")
{
window.__no_inline1 = CPU.prototype.do_run;
window.__no_inline2 = CPU.prototype.exception_cleanup;
window.__no_inline3 = CPU.prototype.hlt_loop;
};
/**
* execute a single instruction cycle on the cpu
* this includes reading all prefixes and the whole instruction
*/
CPU.prototype.cycle = function()
{
this.previous_ip = this.instruction_pointer;
this.timestamp_counter++;
var opcode = this.read_imm8();
if(DEBUG)
{
this.debug.logop(this.instruction_pointer - 1 >>> 0, opcode);
}
// call the instruction
this.table[opcode](this);
if(this.flags & flag_trap)
{
// TODO
dbg_log("Trap flag: Ignored", LOG_CPU);
}
};
CPU.prototype.cycle_translated = function()
{
this.previous_ip = this.instruction_pointer;
this.timestamp_counter++;
this.large_table[this.get_imm16() | 0](this);
};
CPU.prototype.do_op = function()
{
this.table[this.read_imm8()](this);
};
CPU.prototype.hlt_loop = function()
{
//dbg_log("In HLT loop", LOG_CPU);
var now = Date.now();
if(ENABLE_HPET)
{
var pit_time = this.devices.pit.timer(now, this.devices.hpet.legacy_mode);
var rtc_time = this.devices.rtc.timer(now, this.devices.hpet.legacy_mode);
this.devices.hpet.timer(now);
}
else
{
var pit_time = this.devices.pit.timer(now, false);
var rtc_time = this.devices.rtc.timer(now, false);
}
return 0;
};
CPU.prototype.clear_prefixes = function()
{
this.repeat_string_prefix = REPEAT_STRING_PREFIX_NONE;
this.segment_prefix = SEG_PREFIX_NONE;
if(this.address_size_32 !== this.is_32)
{
this.address_size_32 = this.is_32;
this.update_address_size();
}
if(this.operand_size_32 !== this.is_32)
{
this.operand_size_32 = this.is_32;
this.update_operand_size();
}
};
CPU.prototype.cr0_changed = function(old_cr0)
{
//dbg_log("cr0 = " + h(this.cr[0] >>> 0), LOG_CPU);
var new_paging = (this.cr[0] & CR0_PG) === CR0_PG;
if(!this.fpu)
{
// if there's no FPU, keep emulation set
this.cr[0] |= CR0_EM;
}
this.cr[0] |= CR0_ET;
dbg_assert(typeof this.paging === "boolean");
if(new_paging !== this.paging)
{
this.paging = new_paging;
this.full_clear_tlb();
}
if(OP_TRANSLATION && (this.cr[0] ^ old_cr0) & 1)
{
this.translator.clear_cache();
}
};
CPU.prototype.paging_changed = function()
{
this.last_virt_eip = -1;
this.last_virt_esp = -1;
};
CPU.prototype.cpl_changed = function()
{
this.last_virt_eip = -1;
this.last_virt_esp = -1;
};
CPU.prototype.get_phys_eip = function()
{
if((this.instruction_pointer & ~0xFFF) ^ this.last_virt_eip)
{
this.eip_phys = this.translate_address_read(this.instruction_pointer) ^ this.instruction_pointer;
this.last_virt_eip = this.instruction_pointer & ~0xFFF;
}
return this.eip_phys ^ this.instruction_pointer;
};
CPU.prototype.read_imm8 = function()
{
if((this.instruction_pointer & ~0xFFF) ^ this.last_virt_eip)
{
this.eip_phys = this.translate_address_read(this.instruction_pointer) ^ this.instruction_pointer;
this.last_virt_eip = this.instruction_pointer & ~0xFFF;
}
// memory.read8 inlined under the assumption that code never runs in
// memory-mapped space
//var data8 = this.memory.mem8[this.eip_phys ^ this.instruction_pointer] | 0;
var data8 = this.memory.read8(this.eip_phys ^ this.instruction_pointer);
this.instruction_pointer = this.instruction_pointer + 1 | 0;
return data8;
};
CPU.prototype.read_imm8s = function()
{
return this.read_imm8() << 24 >> 24;
};
CPU.prototype.read_imm16 = function()
{
// Two checks in one comparison:
// 1. Did the high 20 bits of eip change
// or 2. Are the low 12 bits of eip 0xFFF (and this read crosses a page boundary)
if(((this.instruction_pointer ^ this.last_virt_eip) >>> 0) > 0xFFE)
{
return this.read_imm8() | this.read_imm8() << 8;
}
var data16 = this.memory.read16(this.eip_phys ^ this.instruction_pointer);
this.instruction_pointer = this.instruction_pointer + 2 | 0;
return data16;
};
CPU.prototype.read_imm16s = function()
{
return this.read_imm16() << 16 >> 16;
};
CPU.prototype.read_imm32s = function()
{
// Analogue to the above comment
if(((this.instruction_pointer ^ this.last_virt_eip) >>> 0) > 0xFFC)
{
return this.read_imm16() | this.read_imm16() << 16;
}
var data32 = this.memory.read32s(this.eip_phys ^ this.instruction_pointer);
this.instruction_pointer = this.instruction_pointer + 4 | 0;
return data32;
};
CPU.prototype.get_imm16 = function()
{
return this.safe_read16(this.instruction_pointer);
//if(((this.instruction_pointer ^ this.last_virt_eip) >>> 0) > 0xFFE)
//{
// return this.safe_read16(this.instruction_pointer);
//}
//return this.memory.read16(this.eip_phys ^ this.instruction_pointer);
};
CPU.prototype.get_imm32s = function()
{
if(((this.instruction_pointer ^ this.last_virt_eip) >>> 0) > 0xFFC)
{
return this.safe_read32s(this.instruction_pointer);
}
return this.memory.read32s(this.eip_phys ^ this.instruction_pointer);
};
// read word from a page boundary, given 2 physical addresses
CPU.prototype.virt_boundary_read16 = function(low, high)
{
dbg_assert((low & 0xFFF) === 0xFFF);
dbg_assert((high & 0xFFF) === 0);
return this.memory.read8(low) | this.memory.read8(high) << 8;
};
// read doubleword from a page boundary, given 2 addresses
CPU.prototype.virt_boundary_read32s = function(low, high)
{
dbg_assert((low & 0xFFF) >= 0xFFD);
dbg_assert((high - 3 & 0xFFF) === (low & 0xFFF));
var mid;
if(low & 1)
{
if(low & 2)
{
// 0xFFF
mid = this.memory.read_aligned16(high - 2 >> 1);
}
else
{
// 0xFFD
mid = this.memory.read_aligned16(low + 1 >> 1);
}
}
else
{
// 0xFFE
mid = this.virt_boundary_read16(low + 1 | 0, high - 1 | 0);
}
return this.memory.read8(low) | mid << 8 | this.memory.read8(high) << 24;;
};
CPU.prototype.virt_boundary_write16 = function(low, high, value)
{
dbg_assert((low & 0xFFF) === 0xFFF);
dbg_assert((high & 0xFFF) === 0);
this.memory.write8(low, value);
this.memory.write8(high, value >> 8);
};
CPU.prototype.virt_boundary_write32 = function(low, high, value)
{
dbg_assert((low & 0xFFF) >= 0xFFD);
dbg_assert((high - 3 & 0xFFF) === (low & 0xFFF));
this.memory.write8(low, value);
this.memory.write8(high, value >> 24);
if(low & 1)
{
if(low & 2)
{
// 0xFFF
this.memory.write8(high - 2, value >> 8);
this.memory.write8(high - 1, value >> 16);
}
else
{
// 0xFFD
this.memory.write8(low + 1 | 0, value >> 8);
this.memory.write8(low + 2 | 0, value >> 16);
}
}
else
{
// 0xFFE
this.memory.write8(low + 1 | 0, value >> 8);
this.memory.write8(high - 1, value >> 16);
}
};
// safe_read, safe_write
// read or write byte, word or dword to the given *virtual* address,
// and be safe on page boundaries
CPU.prototype.safe_read8 = function(addr)
{
dbg_assert(addr < 0x80000000);
return this.memory.read8(this.translate_address_read(addr));
};
CPU.prototype.safe_read16 = function(addr)
{
if(this.paging && (addr & 0xFFF) === 0xFFF)
{
return this.safe_read8(addr) | this.safe_read8(addr + 1 | 0) << 8;
}
else
{
return this.memory.read16(this.translate_address_read(addr));
}
};
CPU.prototype.safe_read32s = function(addr)
{
if(this.paging && (addr & 0xFFF) >= 0xFFD)
{
return this.safe_read16(addr) | this.safe_read16(addr + 2 | 0) << 16;
}
else
{
return this.memory.read32s(this.translate_address_read(addr));
}
};
CPU.prototype.safe_write8 = function(addr, value)
{
dbg_assert(addr < 0x80000000);
this.memory.write8(this.translate_address_write(addr), value);
};
CPU.prototype.safe_write16 = function(addr, value)
{
var phys_low = this.translate_address_write(addr);
if((addr & 0xFFF) === 0xFFF)
{
this.virt_boundary_write16(phys_low, this.translate_address_write(addr + 1 | 0), value);
}
else
{
this.memory.write16(phys_low, value);
}
};
CPU.prototype.safe_write32 = function(addr, value)
{
var phys_low = this.translate_address_write(addr);
if((addr & 0xFFF) >= 0xFFD)
{
this.virt_boundary_write32(phys_low, this.translate_address_write(addr + 3 | 0), value);
}
else
{
this.memory.write32(phys_low, value);
}
};
// read 2 or 4 byte from ip, depending on address size attribute
CPU.prototype.read_moffs = function()
{
if(this.address_size_32)
{
return this.get_seg_prefix(reg_ds) + this.read_imm32s() | 0;
}
else
{
return this.get_seg_prefix(reg_ds) + this.read_imm16() | 0;
}
};
CPU.prototype.getiopl = function()
{
return this.flags >> 12 & 3;
};
CPU.prototype.vm86_mode = function()
{
return !!(this.flags & flag_vm);
};
CPU.prototype.get_eflags = function()
{
return (this.flags & ~flags_all) | !!this.getcf() | !!this.getpf() << 2 | !!this.getaf() << 4 |
!!this.getzf() << 6 | !!this.getsf() << 7 | !!this.getof() << 11;
};
CPU.prototype.load_eflags = function()
{
this.flags = this.get_eflags();
this.flags_changed = 0;
};
/**
* Update the flags register depending on iopl and cpl
*/
CPU.prototype.update_eflags = function(new_flags)
{
var dont_update = flag_rf | flag_vm | flag_vip | flag_vif,
clear = ~flag_vip & ~flag_vif & flags_mask;
if(this.flags & flag_vm)
{
// other case needs to be handled in popf or iret
dbg_assert(this.getiopl() === 3);
dont_update |= flag_iopl;
// don't clear vip or vif
clear |= flag_vip | flag_vif;
}
else
{
if(!this.protected_mode) dbg_assert(this.cpl === 0);
if(this.cpl)
{
// cpl > 0
// cannot update iopl
dont_update |= flag_iopl;
if(this.cpl > this.getiopl())
{
// cpl > iopl
// cannot update interrupt flag
dont_update |= flag_interrupt;
}
}
}
this.flags = (new_flags ^ ((this.flags ^ new_flags) & dont_update)) & clear | flags_default;
this.flags_changed = 0;
};
CPU.prototype.get_stack_pointer = function(mod)
{
if(this.stack_size_32)
{
return this.get_seg(reg_ss) + this.stack_reg[this.reg_vsp] + mod | 0;
}
else
{
return this.get_seg(reg_ss) + (this.stack_reg[this.reg_vsp] + mod & 0xFFFF) | 0;
}
};
/*
* returns the "real" instruction pointer,
* without segment offset
*/
CPU.prototype.get_real_eip = function()
{
return this.instruction_pointer - this.get_seg(reg_cs) | 0;
};
CPU.prototype.call_interrupt_vector = function(interrupt_nr, is_software_int, error_code)
{
dbg_assert(this.instruction_pointer !== undefined);
if(DEBUG && this.debug.step_mode)
{
//this.debug.ops.add(this.instruction_pointer >>> 0);
//this.debug.ops.add("-- INT " + h(interrupt_nr));
//this.debug.ops.add(1);
}
//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.memory.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 === 14)
//{
// dbg_log("int14 error_code=" + error_code +
// " cr2=" + h(this.cr[2] >>> 0) +
// " prev=" + h(this.previous_ip >>> 0) +
// " cpl=" + this.cpl, LOG_CPU);
//}
//if(interrupt_nr === 0x40)
//{
// dbg_log("kolibri syscall");
// this.debug.dump_regs_short();
//}
// we have to leave hlt_loop at some point, this is a
// good place to do it
//this.in_hlt && dbg_log("Leave HLT loop", LOG_CPU);
this.in_hlt = false;
if(this.protected_mode)
{
if(this.vm86_mode() && (this.cr[4] & CR4_VME))
{
throw this.debug.unimpl("VME");
}
if(this.vm86_mode() && is_software_int && this.getiopl() < 3)
{
this.trigger_gp(0);
}
if((interrupt_nr << 3 | 7) > this.idtr_size)
{
dbg_log(interrupt_nr, LOG_CPU);
dbg_trace(LOG_CPU);
throw this.debug.unimpl("#GP handler");
}
var addr = this.idtr_offset + (interrupt_nr << 3) | 0;
dbg_assert((addr & 0xFFF) < 0xFF8);
if(this.paging)
{
addr = this.translate_address_system_read(addr);
}
var base = this.memory.read16(addr) | this.memory.read16(addr + 6 | 0) << 16,
selector = this.memory.read16(addr + 2 | 0),
type = this.memory.read8(addr + 5 | 0),
dpl = type >> 5 & 3,
is_trap,
is_16 = false;
if((type & 128) === 0)
{
// present bit not set
throw this.debug.unimpl("#NP handler");
}
if(is_software_int && dpl < this.cpl)
{
this.trigger_gp(interrupt_nr << 3 | 2);
}
type &= 31;
if(type === 14)
{
is_trap = false;
is_16 = false;
}
else if(type === 15)
{
is_trap = true;
is_16 = false;
}
else if(type === 5)
{
// task gate
dbg_trace();
dbg_log("interrupt to task gate: int=" + h(interrupt_nr, 2) + " sel=" + h(selector, 4) + " dpl=" + dpl, LOG_CPU);
this.do_task_switch(selector);
if(error_code !== false)
{
dbg_assert(typeof error_code == "number");
// TODO: push16 if in 16 bit mode?
this.push32(error_code);
}
return;
}
else if(type === 6)
{
// 16 bit interrupt gate
throw this.debug.unimpl("16 bit interrupt gate");
is_trap = false;
is_16 = true;
}
else if(type === 7)
{
// 16 bit trap gate
is_trap = true;
is_16 = true;
}
else
{
// invalid type
dbg_trace(LOG_CPU);
dbg_log("invalid type: " + h(type));
dbg_log(h(addr) + " " + h(base >>> 0) + " " + h(selector));
throw this.debug.unimpl("#GP handler");
}
var info = this.lookup_segment_selector(selector);
if(info.is_null)
{
dbg_log("is null");
throw this.debug.unimpl("#GP handler");
}
if(!info.is_executable || info.dpl > this.cpl)
{
dbg_log("not exec");
throw this.debug.unimpl("#GP handler");
}
if(!info.is_present)
{
dbg_log("not present");
throw this.debug.unimpl("#NP handler");
}
this.load_eflags();
var old_flags = this.flags;
if(!info.dc_bit && info.dpl < this.cpl)
{
// inter privilege level interrupt
// interrupt from vm86 mode
//dbg_log("Inter privilege interrupt gate=" + h(selector, 4) + ":" + h(base >>> 0, 8) + " trap=" + is_trap + " 16bit=" + is_16, LOG_CPU);
//this.debug.dump_regs_short();
var tss_stack_addr = (info.dpl << 3) + 4 | 0;
if((tss_stack_addr + 5 | 0) > this.segment_limits[reg_tr])
{
throw this.debug.unimpl("#TS handler");
}
tss_stack_addr = tss_stack_addr + this.segment_offsets[reg_tr] | 0;
if(this.paging)
{
tss_stack_addr = this.translate_address_system_read(tss_stack_addr);
}
var new_esp = this.memory.read32s(tss_stack_addr),
new_ss = this.memory.read16(tss_stack_addr + 4 | 0),
ss_info = this.lookup_segment_selector(new_ss);
if(ss_info.is_null)
{
throw this.debug.unimpl("#TS handler");
}
if(ss_info.rpl !== info.dpl)
{
throw this.debug.unimpl("#TS handler");
}
if(ss_info.dpl !== info.dpl || !ss_info.rw_bit)
{
throw this.debug.unimpl("#TS handler");
}
if(!ss_info.is_present)
{
throw this.debug.unimpl("#TS handler");
}
var old_esp = this.reg32s[reg_esp],
old_ss = this.sreg[reg_ss];
if(old_flags & flag_vm)
{
//dbg_log("return from vm86 mode");
//this.debug.dump_regs_short();
dbg_assert(info.dpl === 0, "switch to non-0 dpl from vm86 mode");
}
this.cpl = info.dpl;
//dbg_log("int" + h(interrupt_nr, 2) +" from=" + h(this.instruction_pointer >>> 0, 8)
// + " cpl=" + this.cpl + " old ss:esp=" + h(old_ss, 4) + ":" + h(old_esp >>> 0, 8), LOG_CPU);
this.cpl_changed();
dbg_assert(typeof info.size === "boolean");
if(this.is_32 !== info.size)
{
this.update_cs_size(info.size);
}
this.flags &= ~flag_vm & ~flag_rf;
this.switch_seg(reg_ss, new_ss);
this.stack_reg[this.reg_vsp] = new_esp;
if(old_flags & flag_vm)
{
if(is_16)
{
this.writable_or_pagefault(this.get_stack_pointer(-20), 20);
this.push16(this.sreg[reg_gs]);
this.push16(this.sreg[reg_fs]);
this.push16(this.sreg[reg_ds]);
this.push16(this.sreg[reg_es]);
}
else
{
this.writable_or_pagefault(this.get_stack_pointer(-40), 40);
this.push32(this.sreg[reg_gs]);
this.push32(this.sreg[reg_fs]);
this.push32(this.sreg[reg_ds]);
this.push32(this.sreg[reg_es]);
}
}
else
{
if(is_16)
{
this.writable_or_pagefault(this.get_stack_pointer(-12), 12);
}
else
{
this.writable_or_pagefault(this.get_stack_pointer(-24), 24);
}
}
if(is_16)
{
this.push16(old_ss);
this.push16(old_esp);
}
else
{
this.push32(old_ss);
this.push32(old_esp);
}
//dbg_log("esp pushed to " + h(this.get_stack_pointer(0) >>> 0));
}
else if(info.dc_bit || info.dpl === this.cpl)
{
//dbg_log("Intra privilege interrupt gate=" + h(selector, 4) + ":" + h(base >>> 0, 8) +
// " trap=" + is_trap + " 16bit=" + is_16 +
// " cpl=" + this.cpl + " dpl=" + info.dpl + " conforming=" + +info.dc_bit, LOG_CPU);
//this.debug.dump_regs_short();
if(is_16)
{
this.writable_or_pagefault(this.get_stack_pointer(-8), 8);
}
else
{
this.writable_or_pagefault(this.get_stack_pointer(-16), 16);
}
if(this.flags & flag_vm)
{
dbg_log("xxx");
this.trigger_gp(selector & ~3);
}
// intra privilege level interrupt
//dbg_log("int" + h(interrupt_nr, 2) +" from=" + h(this.instruction_pointer, 8), LOG_CPU);
}
else
{
throw this.debug.unimpl("#GP handler");
}
if(is_16)
{
this.push16(old_flags);
this.push16(this.sreg[reg_cs]);
this.push16(this.get_real_eip());
if(error_code !== false)
{
dbg_assert(typeof error_code == "number");
this.push16(error_code);
}
base &= 0xFFFF;
}
else
{
this.push32(old_flags);
this.push32(this.sreg[reg_cs]);
this.push32(this.get_real_eip());
//dbg_log("pushed eip to " + h(this.reg32s[reg_esp], 8), LOG_CPU);
if(error_code !== false)
{
dbg_assert(typeof error_code == "number");
this.push32(error_code);
}
}
if(old_flags & flag_vm)
{
this.switch_seg(reg_gs, 0);
this.switch_seg(reg_fs, 0);
this.switch_seg(reg_ds, 0);
this.switch_seg(reg_es, 0);
}
// TODO
this.sreg[reg_cs] = selector & ~3 | this.cpl;
//this.switch_seg(reg_cs);
dbg_assert(typeof info.size === "boolean");
dbg_assert(typeof this.is_32 === "boolean");
if(this.is_32 !== info.size)
{
this.update_cs_size(info.size);
}
this.segment_limits[reg_cs] = info.effective_limit;
this.segment_offsets[reg_cs] = info.base;
//dbg_log("current esp: " + h(this.reg32s[reg_esp] >>> 0, 8), LOG_CPU);
//dbg_log("call int " + h(interrupt_nr >>> 0, 8) +
// " from " + h(this.instruction_pointer >>> 0, 8) +
// " to " + h(base >>> 0) +
// " if=" + +!!(is_trap && this.flags & flag_interrupt) +
// " error_code=" + error_code, LOG_CPU);
this.instruction_pointer = this.get_seg(reg_cs) + base | 0;
//dbg_log("int" + h(interrupt_nr) + " trap=" + is_trap + " if=" + +!!(this.flags & flag_interrupt));
if(!is_trap)
{
// clear int flag for interrupt gates
this.flags &= ~flag_interrupt;
}
else
{
//this.handle_irqs();
}
}
else
{
// call 4 byte cs:ip interrupt vector from ivt at cpu.memory 0
this.writable_or_pagefault(this.get_stack_pointer(-6), 6);
var index = interrupt_nr << 2;
var new_ip = this.memory.read16(index);
var new_cs = this.memory.read16(index + 2 | 0);
//dbg_log("real mode interrupt #" + h(interrupt_nr) + " to " + h(new_cs, 4) + ":" + h(new_ip, 4), LOG_CPU);
//dbg_trace(LOG_CPU);
// push flags, cs:ip
this.load_eflags();
this.push16(this.flags);
this.push16(this.sreg[reg_cs]);
this.push16(this.get_real_eip());
this.flags = this.flags & ~flag_interrupt;
this.switch_seg(reg_cs, new_cs);
this.instruction_pointer = this.get_seg(reg_cs) + new_ip | 0;
}
};
CPU.prototype.iret16 = function()
{
if(!this.protected_mode || (this.vm86_mode() && this.getiopl() === 3))
{
if(this.vm86_mode())
{
//dbg_log("iret16 in vm86 mode iopl=3", LOG_CPU);
//this.debug.dump_regs_short();
}
var new_ip = this.pop16();
var new_cs = this.pop16();
var new_flags = this.pop16();
this.switch_seg(reg_cs, new_cs);
this.instruction_pointer = new_ip + this.get_seg(reg_cs) | 0;
this.update_eflags((this.flags & ~0xFFFF) | new_flags);
this.handle_irqs();
}
else
{
if(this.vm86_mode())
{
// vm86 mode, iopl != 3
this.trigger_gp(0);
}
throw this.debug.unimpl("16 bit iret in protected mode");
}
};
CPU.prototype.iret32 = function()
{
if(!this.protected_mode || (this.vm86_mode() && this.getiopl() === 3))
{
//if(this.vm86_mode()) dbg_log("iret in vm86 mode iopl=3", LOG_CPU);
var ip = this.pop32s();
if(ip & 0xFFFF0000)
{
throw this.debug.unimpl("#GP handler");
}
this.switch_seg(reg_cs, this.pop32s() & 0xFFFF);
var new_flags = this.pop32s();
this.instruction_pointer = ip + this.get_seg(reg_cs) | 0;
this.update_eflags(new_flags);
this.handle_irqs();
return;
}
if(this.vm86_mode())
{
// vm86 mode, iopl != 3
this.trigger_gp(0);
}
if(this.flags & flag_nt)
{
if(DEBUG) throw this.debug.unimpl("nt");
}
this.instruction_pointer = this.pop32s();
this.sreg[reg_cs] = this.pop32s();
var new_flags = this.pop32s();
if(new_flags & flag_vm)
{
if(this.cpl === 0)
{
// return to virtual 8086 mode
this.update_eflags(new_flags);
this.flags |= flag_vm;
//dbg_log("in vm86 mode now " +
// " cs:eip=" + h(this.sreg[reg_cs]) + ":" + h(this.instruction_pointer >>> 0) +
// " iopl=" + this.getiopl(), LOG_CPU);
this.switch_seg(reg_cs, this.sreg[reg_cs]);
this.instruction_pointer = (this.instruction_pointer & 0xFFFF) + this.get_seg(reg_cs) | 0;
var temp_esp = this.pop32s();
var temp_ss = this.pop32s();
this.switch_seg(reg_es, this.pop32s() & 0xFFFF);
this.switch_seg(reg_ds, this.pop32s() & 0xFFFF);
this.switch_seg(reg_fs, this.pop32s() & 0xFFFF);
this.switch_seg(reg_gs, this.pop32s() & 0xFFFF);
this.reg32s[reg_esp] = temp_esp;
this.switch_seg(reg_ss, temp_ss & 0xFFFF);
this.cpl = 3;
this.cpl_changed();
this.update_cs_size(false);
//this.debug.dump_regs_short();
return;
}
else
{
// ignored if not cpl=0
new_flags &= ~flag_vm;
}
}
// protected mode return
var info = this.lookup_segment_selector(this.sreg[reg_cs]);
if(info.is_null)
{
throw this.debug.unimpl("is null");
}
if(!info.is_present)
{
throw this.debug.unimpl("not present");
}
if(!info.is_executable)
{
throw this.debug.unimpl("not exec");
}
if(info.rpl < this.cpl)
{
throw this.debug.unimpl("rpl < cpl");
}
if(info.dc_bit && info.dpl > info.rpl)
{
throw this.debug.unimpl("conforming and dpl > rpl");
}
if(info.rpl > this.cpl)
{
// outer privilege return
var temp_esp = this.pop32s();
var temp_ss = this.pop32s();
this.reg32s[reg_esp] = temp_esp;
this.update_eflags(new_flags);
if(!this.cpl)
{
this.flags = this.flags & ~flag_vif & ~flag_vip | (new_flags & (flag_vif | flag_vip));
}
this.cpl = info.rpl;
this.cpl_changed();
this.switch_seg(reg_ss, temp_ss & 0xFFFF);
//dbg_log("iret cpu.cpl=" + this.cpl + " to " + h(this.instruction_pointer) +
// " cs:eip=" + h(this.sreg[reg_cs],4) + ":" + h(this.get_real_eip(), 8) +
// " ss:esp=" + h(temp_ss & 0xFFFF, 2) + ":" + h(temp_esp, 8), LOG_CPU);
}
else
{
// same privilege return
dbg_assert(info.rpl === this.cpl);
this.update_eflags(new_flags);
// update vip and vif, which are not changed by update_eflags
if(!this.cpl)
{
this.flags = this.flags & ~flag_vif & ~flag_vip | (new_flags & (flag_vif | flag_vip));
}
//dbg_log(h(new_flags) + " " + h(this.flags));
//dbg_log("iret to " + h(this.instruction_pointer));
}
dbg_assert(typeof info.size === "boolean");
if(info.size !== this.is_32)
{
this.update_cs_size(info.size);
}
this.segment_limits[reg_cs] = info.effective_limit;
this.segment_offsets[reg_cs] = info.base;
this.instruction_pointer = this.instruction_pointer + this.get_seg(reg_cs) | 0;
//dbg_log("iret if=" + (this.flags & flag_interrupt) +
// " cpl=" + this.cpl +
// " eip=" + h(this.instruction_pointer >>> 0, 8), LOG_CPU);
this.handle_irqs();
};
CPU.prototype.do_task_switch = function(selector)
{
var descriptor = this.lookup_segment_selector(selector);
if(!descriptor.is_valid || descriptor.is_null || !descriptor.from_gdt)
{
throw this.debug.unimpl("#GP handler");
}
if((descriptor.access & 31) === 0xB)
{
// is busy
throw this.debug.unimpl("#GP handler");
}
if(!descriptor.is_present)
{
throw this.debug.unimpl("#NP handler");
}
if(descriptor.effective_limit < 103)
{
throw this.debug.unimpl("#NP handler");
}
var tsr_size = this.segment_limits[reg_tr];
var tsr_offset = this.segment_offsets[reg_tr];
var old_eflags = this.get_eflags();
if(false /* is iret */)
{
old_eflags &= ~flag_nt;
}
this.writable_or_pagefault(tsr_offset, 0x66);
//this.safe_write32(tsr_offset + TSR_CR3, this.cr[3]);
this.safe_write32(tsr_offset + TSR_EIP, this.get_real_eip());
this.safe_write32(tsr_offset + TSR_EFLAGS, old_eflags);
this.safe_write32(tsr_offset + TSR_EAX, this.reg32s[reg_eax]);
this.safe_write32(tsr_offset + TSR_ECX, this.reg32s[reg_ecx]);
this.safe_write32(tsr_offset + TSR_EDX, this.reg32s[reg_edx]);
this.safe_write32(tsr_offset + TSR_EBX, this.reg32s[reg_ebx]);
this.safe_write32(tsr_offset + TSR_ESP, this.reg32s[reg_esp]);
this.safe_write32(tsr_offset + TSR_EBP, this.reg32s[reg_ebp]);
this.safe_write32(tsr_offset + TSR_ESI, this.reg32s[reg_esi]);
this.safe_write32(tsr_offset + TSR_EDI, this.reg32s[reg_edi]);
this.safe_write32(tsr_offset + TSR_ES, this.sreg[reg_es]);
this.safe_write32(tsr_offset + TSR_CS, this.sreg[reg_cs]);
this.safe_write32(tsr_offset + TSR_SS, this.sreg[reg_ss]);
this.safe_write32(tsr_offset + TSR_DS, this.sreg[reg_ds]);
this.safe_write32(tsr_offset + TSR_FS, this.sreg[reg_fs]);
this.safe_write32(tsr_offset + TSR_GS, this.sreg[reg_gs]);
this.safe_write32(tsr_offset + TSR_LDT, this.sreg[reg_ldtr]);
if(true /* is jump or call or int */)
{
// mark as busy
this.memory.write8(descriptor.table_offset + 5 | 0, this.memory.read8(descriptor.table_offset + 5 | 0) | 2);
}
//var new_tsr_size = descriptor.effective_limit;
var new_tsr_offset = descriptor.base;
var new_cr3 = this.safe_read32s(new_tsr_offset + TSR_CR3);
this.flags &= ~flag_vm;
this.switch_seg(reg_cs, this.safe_read16(new_tsr_offset + TSR_CS));
var new_eflags = this.safe_read32s(new_tsr_offset + TSR_EFLAGS);
if(true /* is call or int */)
{
this.safe_write32(tsr_offset + TSR_BACKLINK, selector);
new_eflags |= flag_nt;
}
if(new_eflags & flag_vm)
{
throw this.debug.unimpl("task switch to VM mode");
}
this.update_eflags(new_eflags);
this.load_ldt(this.safe_read16(new_tsr_offset + TSR_LDT));
this.reg32s[reg_eax] = this.safe_read32s(new_tsr_offset + TSR_EAX);
this.reg32s[reg_ecx] = this.safe_read32s(new_tsr_offset + TSR_ECX);
this.reg32s[reg_edx] = this.safe_read32s(new_tsr_offset + TSR_EDX);
this.reg32s[reg_ebx] = this.safe_read32s(new_tsr_offset + TSR_EBX);
this.reg32s[reg_esp] = this.safe_read32s(new_tsr_offset + TSR_ESP);
this.reg32s[reg_ebp] = this.safe_read32s(new_tsr_offset + TSR_EBP);
this.reg32s[reg_esi] = this.safe_read32s(new_tsr_offset + TSR_ESI);
this.reg32s[reg_edi] = this.safe_read32s(new_tsr_offset + TSR_EDI);
this.switch_seg(reg_es, this.safe_read16(new_tsr_offset + TSR_ES));
this.switch_seg(reg_ss, this.safe_read16(new_tsr_offset + TSR_SS));
this.switch_seg(reg_ds, this.safe_read16(new_tsr_offset + TSR_DS));
this.switch_seg(reg_fs, this.safe_read16(new_tsr_offset + TSR_FS));
this.switch_seg(reg_gs, this.safe_read16(new_tsr_offset + TSR_GS));
this.instruction_pointer = this.get_seg(reg_cs) + this.safe_read32s(new_tsr_offset + TSR_EIP) | 0;
this.segment_offsets[reg_tr] = descriptor.base;
this.segment_limits[reg_tr] = descriptor.effective_limit;
this.sreg[reg_tr] = selector;
this.cr[3] = new_cr3;
dbg_assert((this.cr[3] & 0xFFF) === 0);
this.clear_tlb();
this.cr[0] |= CR0_TS;
//debugger;
//throw "todo";
};
CPU.prototype.hlt_op = function()
{
if(this.cpl)
{
this.trigger_gp(0);
}
// hlt
if((this.flags & flag_interrupt) === 0)
{
this.debug.show("cpu halted");
if(DEBUG) this.debug.dump_regs();
throw "HALT";
}
else
{
// get out of here and into hlt_loop
this.in_hlt = true;
throw MAGIC_CPU_EXCEPTION;
}
};
// assumes ip to point to the byte before the next instruction
CPU.prototype.raise_exception = function(interrupt_nr)
{
if(DEBUG && interrupt_nr !== 7)
{
// show interesting exceptions
dbg_log("Exception " + h(interrupt_nr), LOG_CPU);
dbg_trace(LOG_CPU);
this.debug.dump_regs_short();
}
this.call_interrupt_vector(interrupt_nr, false, false);
throw MAGIC_CPU_EXCEPTION;
};
CPU.prototype.raise_exception_with_code = function(interrupt_nr, error_code)
{
if(DEBUG)
{
dbg_log("Exception " + h(interrupt_nr) + " err=" + h(error_code), LOG_CPU);
dbg_trace(LOG_CPU);
this.debug.dump_regs_short();
}
this.call_interrupt_vector(interrupt_nr, false, error_code);
throw MAGIC_CPU_EXCEPTION;
};
CPU.prototype.trigger_de = function()
{
this.instruction_pointer = this.previous_ip;
this.raise_exception(0);
};
CPU.prototype.trigger_ud = function()
{
this.instruction_pointer = this.previous_ip;
this.raise_exception(6);
};
CPU.prototype.trigger_nm = function()
{
this.instruction_pointer = this.previous_ip;
this.raise_exception(7);
};
CPU.prototype.trigger_gp = function(code)
{
this.instruction_pointer = this.previous_ip;
this.raise_exception_with_code(13, code);
};
CPU.prototype.trigger_np = function(code)
{
this.instruction_pointer = this.previous_ip;
this.raise_exception_with_code(11, code);
};
CPU.prototype.trigger_ss = function(code)
{
this.instruction_pointer = this.previous_ip;
this.raise_exception_with_code(12, code);
};
// used before fpu instructions
CPU.prototype.task_switch_test = function()
{
if(this.cr[0] & (CR0_EM | CR0_TS))
{
this.trigger_nm();
}
};
CPU.prototype.todo = function()
{
if(DEBUG)
{
dbg_trace();
throw "TODO";
}
this.trigger_ud();
};
CPU.prototype.undefined_instruction = function()
{
if(DEBUG)
{
throw "Possible fault: undefined instruction";
}
this.trigger_ud();
};
CPU.prototype.unimplemented_sse = function()
{
dbg_log("No SSE", LOG_CPU);
this.trigger_ud();
};
CPU.prototype.get_seg_prefix_ds = function()
{
return this.get_seg_prefix(reg_ds);
};
CPU.prototype.get_seg_prefix_ss = function()
{
return this.get_seg_prefix(reg_ss);
};
CPU.prototype.get_seg_prefix_cs = function()
{
return this.get_seg_prefix(reg_cs);
};
/**
* Get segment base by prefix or default
* @param {number} default_segment
*/
CPU.prototype.get_seg_prefix = function(default_segment /*, offset*/)
{
if(this.segment_prefix === SEG_PREFIX_NONE)
{
return this.get_seg(default_segment /*, offset*/);
}
else if(this.segment_prefix === SEG_PREFIX_ZERO)
{
return 0;
}
else
{
return this.get_seg(this.segment_prefix /*, offset*/);
}
};
/**
* Get segment base
* @param {number} segment
*/
CPU.prototype.get_seg = function(segment /*, offset*/)
{
dbg_assert(segment >= 0 && segment < 8);
if(this.protected_mode)
{
if(this.segment_is_null[segment])
{
// trying to access null segment
if(DEBUG)
{
dbg_log("Load null segment: " + segment + " sel=" + h(this.sreg[segment], 4), LOG_CPU);
throw this.debug.unimpl("#GP handler");
}
}
// TODO:
// - validate segment limits
// - validate if segment is writable
// - set accessed bit
}
return this.segment_offsets[segment];
};
CPU.prototype.read_e8 = function()
{
if(this.modrm_byte < 0xC0) {
return this.safe_read8(this.modrm_resolve(this.modrm_byte));
} else {
return this.reg8[this.modrm_byte << 2 & 0xC | this.modrm_byte >> 2 & 1];
}
};
CPU.prototype.read_e8s = function()
{
return this.read_e8() << 24 >> 24;
};
CPU.prototype.read_e16 = function()
{
if(this.modrm_byte < 0xC0) {
return this.safe_read16(this.modrm_resolve(this.modrm_byte));
} else {
return this.reg16[this.modrm_byte << 1 & 14];
}
};
CPU.prototype.read_e16s = function()
{
return this.read_e16() << 16 >> 16;
};
CPU.prototype.read_e32s = function()
{
if(this.modrm_byte < 0xC0) {
return this.safe_read32s(this.modrm_resolve(this.modrm_byte));
} else {
return this.reg32s[this.modrm_byte & 7];
}
};
CPU.prototype.read_e32 = function()
{
return this.read_e32s() >>> 0;
};
CPU.prototype.set_e8 = function(addr, value)
{
if(this.modrm_byte < 0xC0) {
this.safe_write8(addr, value);
} else {
this.reg8[this.modrm_byte << 2 & 0xC | this.modrm_byte >> 2 & 1] = value;
}
};
CPU.prototype.set_e16 = function(addr, value)
{
if(this.modrm_byte < 0xC0) {
this.safe_write16(addr, value);
} else {
this.reg16[this.modrm_byte << 1 & 14] = value;
}
};
CPU.prototype.set_e32 = function(addr, value)
{
if(this.modrm_byte < 0xC0) {
this.safe_write32(addr, value);
} else {
this.reg32s[this.modrm_byte & 7] = value;
}
};
CPU.prototype.read_write_e8 = function()
{
if(this.modrm_byte < 0xC0) {
var virt_addr = this.modrm_resolve(this.modrm_byte);
this.phys_addr = this.translate_address_write(virt_addr);
return this.memory.read8(this.phys_addr);
} else {
return this.reg8[this.modrm_byte << 2 & 0xC | this.modrm_byte >> 2 & 1];
}
};
CPU.prototype.write_e8_ = function(value)
{
if(this.modrm_byte < 0xC0) {
this.memory.write8(this.phys_addr, value);
}
else {
this.reg8[this.modrm_byte << 2 & 0xC | this.modrm_byte >> 2 & 1] = value;
}
};
CPU.prototype.read_write_e16 = function()
{
if(this.modrm_byte < 0xC0) {
var virt_addr = this.modrm_resolve(this.modrm_byte);
this.phys_addr = this.translate_address_write(virt_addr);
if(this.paging && (virt_addr & 0xFFF) === 0xFFF) {
this.phys_addr_high = this.translate_address_write(virt_addr + 1 | 0);
return this.virt_boundary_read16(this.phys_addr, this.phys_addr_high);
} else {
this.phys_addr_high = 0;
return this.memory.read16(this.phys_addr);
}
} else {
return this.reg16[this.modrm_byte << 1 & 14];
}
};
CPU.prototype.write_e16_ = function(value)
{
if(this.modrm_byte < 0xC0) {
if(this.phys_addr_high) {
this.virt_boundary_write16(this.phys_addr, this.phys_addr_high, value);
} else {
this.memory.write16(this.phys_addr, value);
}
} else {
this.reg16[this.modrm_byte << 1 & 14] = value;
}
};
CPU.prototype.read_write_e32 = function()
{
if(this.modrm_byte < 0xC0) {
var virt_addr = this.modrm_resolve(this.modrm_byte);
this.phys_addr = this.translate_address_write(virt_addr);
if(this.paging && (virt_addr & 0xFFF) >= 0xFFD) {
this.phys_addr_high = this.translate_address_write(virt_addr + 3 | 0);
return this.virt_boundary_read32s(this.phys_addr, this.phys_addr_high);
} else {
this.phys_addr_high = 0;
return this.memory.read32s(this.phys_addr);
}
} else {
return this.reg32s[this.modrm_byte & 7];
}
};
CPU.prototype.write_e32_ = function(value)
{
if(this.modrm_byte < 0xC0) {
if(this.phys_addr_high) {
this.virt_boundary_write32(this.phys_addr, this.phys_addr_high, value);
} else {
this.memory.write32(this.phys_addr, value);
}
} else {
this.reg32s[this.modrm_byte & 7] = value;
}
};
CPU.prototype.read_reg_e16 = function()
{
return this.reg16[this.modrm_byte << 1 & 14];
}
CPU.prototype.write_reg_e16 = function(value)
{
this.reg16[this.modrm_byte << 1 & 14] = value;
}
CPU.prototype.read_reg_e32s = function()
{
return this.reg32s[this.modrm_byte & 7];
};
CPU.prototype.write_reg_e32 = function(value)
{
this.reg32s[this.modrm_byte & 7] = value;
};
CPU.prototype.read_g8 = function()
{
return this.reg8[this.modrm_byte >> 1 & 0xC | this.modrm_byte >> 5 & 1];
};
CPU.prototype.write_g8 = function(value)
{
this.reg8[this.modrm_byte >> 1 & 0xC | this.modrm_byte >> 5 & 1] = value;
};
CPU.prototype.read_g16 = function()
{
return this.reg16[this.modrm_byte >> 2 & 14];
};
CPU.prototype.read_g16s = function()
{
return this.reg16s[this.modrm_byte >> 2 & 14];
};
CPU.prototype.write_g16 = function(value)
{
this.reg16[this.modrm_byte >> 2 & 14] = value;
};
CPU.prototype.read_g32s = function()
{
return this.reg32s[this.modrm_byte >> 3 & 7];
};
CPU.prototype.write_g32 = function(value)
{
this.reg32[this.modrm_byte >> 3 & 7] = value;
};
CPU.prototype.handle_irqs = function()
{
dbg_assert(!this.page_fault);
if((this.flags & flag_interrupt) && !this.page_fault)
{
if(this.devices.pic)
{
this.devices.pic.check_irqs();
}
if(this.devices.apic)
{
this.devices.apic.check_irqs();
}
}
};
CPU.prototype.device_raise_irq = function(i)
{
dbg_assert(arguments.length === 1);
if(this.devices.pic)
{
this.devices.pic.raise_irq(i);
}
if(this.devices.apic)
{
this.devices.apic.raise_irq(i);
}
};
CPU.prototype.test_privileges_for_io = function(port, size)
{
if(this.protected_mode && (this.cpl > this.getiopl() || (this.flags & flag_vm)))
{
var tsr_size = this.segment_limits[reg_tr],
tsr_offset = this.segment_offsets[reg_tr];
if(tsr_size >= 0x67)
{
var iomap_base = this.memory.read16(this.translate_address_system_read(tsr_offset + 0x64 + 2 | 0)),
high_port = port + size - 1 | 0;
if(tsr_size >= (iomap_base + (high_port >> 3) | 0))
{
var mask = ((1 << size) - 1) << (port & 7),
addr = this.translate_address_system_read(tsr_offset + iomap_base + (port >> 3) | 0),
port_info = (mask & 0xFF00) ?
this.memory.read16(addr) : this.memory.read8(addr);
if(!(port_info & mask))
{
return;
}
}
}
dbg_log("#GP for port io port=" + h(port) + " size=" + size, LOG_CPU);
this.trigger_gp(0);
}
};
CPU.prototype.cpuid = function()
{
// cpuid
// TODO: Fill in with less bogus values
// http://lxr.linux.no/linux+%2a/arch/x86/include/asm/cpufeature.h
// http://www.sandpile.org/x86/cpuid.htm
var eax = 0,
ecx = 0,
edx = 0,
ebx = 0;
switch(this.reg32s[reg_eax])
{
case 0:
// maximum supported level
eax = 5;
ebx = 0x756E6547|0; // Genu
edx = 0x49656E69|0; // ineI
ecx = 0x6C65746E|0; // ntel
break;
case 1:
// pentium
eax = 3 | 6 << 4 | 15 << 8;
ebx = 1 << 16 | 8 << 8; // cpu count, clflush size
ecx = 1 << 23 | 1 << 30; // popcnt, rdrand
edx = (this.fpu ? 1 : 0) | // fpu
1 << 1 | 1 << 3 | 1 << 4 | 1 << 5 | // vme, pse, tsc, msr
1 << 8 | 1 << 11 | 1 << 13 | 1 << 15; // cx8, sep, pge, cmov
edx |= 1 << 9; // apic
break;
case 2:
// Taken from http://siyobik.info.gf/main/reference/instruction/CPUID
eax = 0x665B5001|0;
ebx = 0;
ecx = 0;
edx = 0x007A7000;
break;
case 4:
// from my local machine
switch(this.reg32s[reg_ecx])
{
case 0:
eax = 0x00000121;
ebx = 0x01c0003f;
ecx = 0x0000003f;
edx = 0x00000001;
break;
case 1:
eax = 0x00000122;
ebx = 0x01c0003f;
ecx = 0x0000003f;
edx = 0x00000001;
break
case 2:
eax = 0x00000143;
ebx = 0x05c0003f;
ecx = 0x00000fff;
edx = 0x00000001;
break;
}
break;
case 0x80000000|0:
// maximum supported extended level
eax = 5;
// other registers are reserved
break;
default:
dbg_log("cpuid: unimplemented eax: " + h(this.reg32[reg_eax]), LOG_CPU);
}
dbg_log("cpuid: eax=" + h(this.reg32[reg_eax], 8) + " cl=" + h(this.reg8[reg_cl], 2), LOG_CPU);
this.reg32s[reg_eax] = eax;
this.reg32s[reg_ecx] = ecx;
this.reg32s[reg_edx] = edx;
this.reg32s[reg_ebx] = ebx;
};
CPU.prototype.update_cs_size = function(new_size)
{
this.is_32 = this.operand_size_32 = this.address_size_32 = new_size;
this.update_operand_size();
this.update_address_size();
if(OP_TRANSLATION)
{
this.translator.clear_cache();
}
};
CPU.prototype.update_operand_size = function()
{
if(this.operand_size_32)
{
this.table = this.table32;
this.large_table = this.large_table32;
}
else
{
this.table = this.table16;
this.large_table = this.large_table16;
}
};
CPU.prototype.update_address_size = function()
{
if(this.address_size_32)
{
this.regv = this.reg32s;
this.reg_vcx = reg_ecx;
this.reg_vsi = reg_esi;
this.reg_vdi = reg_edi;
}
else
{
this.regv = this.reg16;
this.reg_vcx = reg_cx;
this.reg_vsi = reg_si;
this.reg_vdi = reg_di;
}
};
/**
* @param {number} selector
*/
CPU.prototype.lookup_segment_selector = function(selector)
{
dbg_assert(typeof selector === "number" && selector >= 0 && selector < 0x10000);
var is_gdt = (selector & 4) === 0,
selector_offset = selector & ~7,
info,
table_offset,
table_limit;
info = {
rpl: selector & 3,
from_gdt: is_gdt,
is_null: false,
is_valid: true,
base: 0,
access: 0,
flags: 0,
type: 0,
dpl: 0,
is_system: false,
is_present: false,
is_executable: false,
rw_bit: false,
dc_bit: false,
size: false,
// limit after applying granularity
effective_limit: 0,
is_writable: false,
is_readable: false,
table_offset: 0,
};
if(is_gdt)
{
table_offset = this.gdtr_offset;
table_limit = this.gdtr_size;
}
else
{
table_offset = this.segment_offsets[reg_ldtr];
table_limit = this.segment_limits[reg_ldtr];
}
if(selector_offset === 0)
{
info.is_null = true;
return info;
}
// limit is the number of entries in the table minus one
if((selector | 7) > table_limit)
{
dbg_log("Selector " + h(selector, 4) + " is outside of the "
+ (is_gdt ? "g" : "l") + "dt limits", LOG_CPU)
info.is_valid = false;
return info;
}
table_offset = table_offset + selector_offset | 0;
if(this.paging)
{
table_offset = this.translate_address_system_read(table_offset);
}
info.table_offset = table_offset;
info.base = this.memory.read16(table_offset + 2 | 0) | this.memory.read8(table_offset + 4 | 0) << 16 |
this.memory.read8(table_offset + 7 | 0) << 24;
info.access = this.memory.read8(table_offset + 5 | 0);
info.flags = this.memory.read8(table_offset + 6 | 0) >> 4;
//this.memory.write8(table_offset + 5 | 0, info.access | 1);
// used if system
info.type = info.access & 0xF;
info.dpl = info.access >> 5 & 3;
info.is_system = (info.access & 0x10) === 0;
info.is_present = (info.access & 0x80) === 0x80;
info.is_executable = (info.access & 8) === 8;
info.rw_bit = (info.access & 2) === 2;
info.dc_bit = (info.access & 4) === 4;
info.size = (info.flags & 4) === 4;
var limit = this.memory.read16(table_offset) |
(this.memory.read8(table_offset + 6 | 0) & 0xF) << 16;
if(info.flags & 8)
{
// granularity set
info.effective_limit = (limit << 12 | 0xFFF) >>> 0;
}
else
{
info.effective_limit = limit;
}
info.is_writable = info.rw_bit && !info.is_executable;
info.is_readable = info.rw_bit || !info.is_executable;
return info;
};
/**
* @param {number} reg
* @param {number} selector
*/
CPU.prototype.switch_seg = function(reg, selector)
{
dbg_assert(reg >= 0 && reg <= 5);
dbg_assert(typeof selector === "number" && selector < 0x10000 && selector >= 0);
if(reg === reg_cs)
{
this.protected_mode = (this.cr[0] & CR0_PE) === CR0_PE;
}
if(!this.protected_mode || this.vm86_mode())
{
this.sreg[reg] = selector;
this.segment_is_null[reg] = 0;
this.segment_offsets[reg] = selector << 4;
if(reg === reg_ss && this.stack_size_32)
{
this.stack_size_32 = false;
this.stack_reg = this.reg16;
this.reg_vsp = reg_sp;
this.reg_vbp = reg_bp;
}
return;
}
var info = this.lookup_segment_selector(selector);
if(reg === reg_ss)
{
if(info.is_null)
{
dbg_log("#GP for loading 0 in SS sel=" + h(selector, 4), LOG_CPU);
dbg_trace(LOG_CPU);
this.trigger_gp(0);
}
if(!info.is_valid ||
info.is_system ||
info.rpl !== this.cpl ||
!info.is_writable ||
info.dpl !== this.cpl)
{
dbg_log("#GP for loading invalid in SS sel=" + h(selector, 4), LOG_CPU);
dbg_trace(LOG_CPU);
this.trigger_gp(selector & ~3);
}
if(!info.is_present)
{
dbg_log("#SS for loading non-present in SS sel=" + h(selector, 4), LOG_CPU);
dbg_trace(LOG_CPU);
this.trigger_ss(selector & ~3);
}
this.stack_size_32 = info.size;
if(info.size)
{
this.stack_reg = this.reg32s;
this.reg_vsp = reg_esp;
this.reg_vbp = reg_ebp;
}
else
{
this.stack_reg = this.reg16;
this.reg_vsp = reg_sp;
this.reg_vbp = reg_bp;
}
}
else if(reg === reg_cs)
{
if(!info.is_executable)
{
// cs not executable
dbg_log(info + " " + h(selector & ~3), LOG_CPU);
this.trigger_gp(selector & ~3);
//throw this.debug.unimpl("#GP handler");
}
if(info.is_system)
{
dbg_log(info + " " + h(selector & ~3), LOG_CPU);
throw this.debug.unimpl("load system segment descriptor, type = " + (info.access & 15));
}
//if(info.dc_bit && (info.dpl !== info.rpl))
//{
// dbg_log(info + " " + h(selector & ~3), LOG_CPU);
// throw this.debug.unimpl("#GP handler");
//}
if(info.rpl !== this.cpl)
{
dbg_log(info + " " + h(selector & ~3), LOG_CPU);
throw this.debug.unimpl("privilege change");
}
dbg_assert(this.cpl === info.dpl);
if(!info.dc_bit && info.dpl < this.cpl)
{
throw this.debug.unimpl("inter privilege call");
}
else
{
if(info.dc_bit || info.dpl === this.cpl)
{
// ok
}
else
{
// PE = 1, interrupt or trap gate, nonconforming code segment, DPL > CPL
dbg_log(info + " " + h(selector & ~3), LOG_CPU);
throw this.debug.unimpl("#GP handler");
}
}
dbg_assert(typeof info.size === "boolean");
if(info.size !== this.is_32)
{
this.update_cs_size(info.size);
}
}
else
{
// es, ds, fs, gs
if(info.is_null)
{
//dbg_log("0 loaded in seg=" + reg + " sel=" + h(selector, 4), LOG_CPU);
//dbg_trace(LOG_CPU);
this.sreg[reg] = selector;
this.segment_is_null[reg] = 1;
return;
}
if(!info.is_valid ||
info.is_system ||
!info.is_readable ||
((!info.is_executable || !info.dc_bit) &&
info.rpl > info.dpl &&
this.cpl > info.dpl))
{
dbg_log("#GP for loading invalid in seg " + reg + " sel=" + h(selector, 4), LOG_CPU);
dbg_trace(LOG_CPU);
this.trigger_gp(selector & ~3);
}
if(!info.is_present)
{
dbg_log("#NP for loading not-present in seg " + reg + " sel=" + h(selector, 4), LOG_CPU);
dbg_trace(LOG_CPU);
this.trigger_np(selector & ~3);
}
}
//dbg_log("seg " + reg + " " + h(info.base));
this.segment_is_null[reg] = 0;
this.segment_limits[reg] = info.effective_limit;
//this.segment_infos[reg] = 0; // TODO
//if(OP_TRANSLATION && (reg === reg_ds || reg === reg_ss) && info.base !== this.segment_offsets[reg])
//{
// this.translator.clear_cache();
//}
this.segment_offsets[reg] = info.base;
this.sreg[reg] = selector;
};
CPU.prototype.load_tr = function(selector)
{
var info = this.lookup_segment_selector(selector);
dbg_log("load tr: " + h(selector, 4), LOG_CPU);
if(!info.from_gdt)
{
throw this.debug.unimpl("TR can only be loaded from GDT");
}
if(info.is_null)
{
dbg_log("#GP(0) | tried to load null selector (ltr)");
throw this.debug.unimpl("#GP handler");
}
if(!info.is_present)
{
dbg_log("#GP | present bit not set (ltr)");
throw this.debug.unimpl("#GP handler");
}
if(!info.is_system)
{
dbg_log("#GP | ltr: not a system entry");
throw this.debug.unimpl("#GP handler");
}
if(info.type !== 9)
{
// 0xB: busy 386 TSS (GP)
// 0x3: busy 286 TSS (GP)
// 0x1: 286 TSS (??)
dbg_log("#GP | ltr: invalid type (type = " + h(info.type) + ")");
throw this.debug.unimpl("#GP handler");
}
this.segment_offsets[reg_tr] = info.base;
this.segment_limits[reg_tr] = info.effective_limit;
this.sreg[reg_tr] = selector;
// Mark task as busy
this.memory.write8(info.table_offset + 5 | 0, this.memory.read8(info.table_offset + 5 | 0) | 2);
//dbg_log("tsr at " + h(info.base) + "; (" + info.effective_limit + " bytes)");
};
CPU.prototype.load_ldt = function(selector)
{
var info = this.lookup_segment_selector(selector);
if(info.is_null)
{
// invalid
this.segment_offsets[reg_ldtr] = 0;
this.segment_limits[reg_ldtr] = 0;
return;
}
if(!info.from_gdt)
{
throw this.debug.unimpl("LDTR can only be loaded from GDT");
}
if(!info.is_present)
{
dbg_log("lldt: present bit not set");
throw this.debug.unimpl("#GP handler");
}
if(!info.is_system)
{
dbg_log("lldt: not a system entry");
throw this.debug.unimpl("#GP handler");
}
if(info.type !== 2)
{
dbg_log("lldt: invalid type (" + info.type + ")");
throw this.debug.unimpl("#GP handler");
}
this.segment_offsets[reg_ldtr] = info.base;
this.segment_limits[reg_ldtr] = info.effective_limit;
this.sreg[reg_ldtr] = selector;
//dbg_log("ldt at " + h(info.base) + "; (" + info.effective_limit + " bytes)");
};
CPU.prototype.arpl = function(seg, r16)
{
this.flags_changed &= ~flag_zero;
if((seg & 3) < (this.reg16[r16] & 3))
{
this.flags |= flag_zero;
return seg & ~3 | this.reg16[r16] & 3;
}
else
{
this.flags &= ~flag_zero;
return seg;
}
};
CPU.prototype.lar = function(selector, original)
{
/** @const */
var LAR_INVALID_TYPE = 1 << 0 | 1 << 6 | 1 << 7 | 1 << 8 | 1 << 0xA |
1 << 0xD | 1 << 0xE | 1 << 0xF;
var info = this.lookup_segment_selector(selector);
this.flags_changed &= ~flag_zero;
//console.log("lar -> ", h(selector, 4), this.cpl, info, LAR_INVALID_TYPE >> info.type & 1);
if(info.is_null || !info.is_valid ||
(LAR_INVALID_TYPE >> info.type & 1)
) {
this.flags &= ~flag_zero;
return original;
}
else
{
this.flags |= flag_zero;
return info.type << 8 | info.size << 12 | info.dpl << 13 |
info.is_present << 15 |
info.flags << 20;
}
};
CPU.prototype.lsl = function(selector, original)
{
/** @const */
var LSL_INVALID_TYPE = 1 << 0 | 1 << 4 | 1 << 5 | 1 << 6 | 1 << 8 |
1 << 0xA | 1 << 0xC | 1 << 0xD | 1 << 0xE | 1 << 0xF;
var info = this.lookup_segment_selector(selector);
this.flags_changed &= ~flag_zero;
//console.log("lsl -> ", h(selector, 4), this.cpl, info, LSL_INVALID_TYPE >> info.type & 1);
//this.debug.dump_gdt_ldt();
if(info.is_null || !info.is_valid ||
(LSL_INVALID_TYPE >> info.type & 1)
) {
this.flags &= ~flag_zero;
return original;
}
else
{
this.flags |= flag_zero;
return info.effective_limit | 0;
}
};
CPU.prototype.clear_tlb = function()
{
// clear tlb excluding global pages
this.last_virt_eip = -1;
this.last_virt_esp = -1;
this.tlb_info.set(this.tlb_info_global);
//dbg_log("page table loaded", LOG_CPU);
};
CPU.prototype.full_clear_tlb = function()
{
//dbg_log("TLB full clear", LOG_CPU);
// clear tlb including global pages
var buf32 = new Int32Array(this.tlb_info_global.buffer);
for(var i = 0; i < (1 << 18); )
{
buf32[i++] = buf32[i++] = buf32[i++] = buf32[i++] = 0;
}
this.clear_tlb();
};
CPU.prototype.invlpg = function(addr)
{
var page = addr >>> 12;
//dbg_log("invlpg: addr=" + h(addr >>> 0), LOG_CPU);
this.tlb_info[page] = 0;
this.tlb_info_global[page] = 0;
this.last_virt_eip = -1;
this.last_virt_esp = -1;
};
CPU.prototype.translate_address_read = function(addr)
{
if(!this.paging)
{
return addr;
}
if(this.cpl === 3)
{
return this.translate_address_user_read(addr);
}
else
{
return this.translate_address_system_read(addr);
}
};
CPU.prototype.translate_address_write = function(addr)
{
if(!this.paging)
{
return addr;
}
if(this.cpl === 3)
{
return this.translate_address_user_write(addr);
}
else
{
return this.translate_address_system_write(addr);
}
};
CPU.prototype.translate_address_user_write = function(addr)
{
var base = addr >>> 12;
if(this.tlb_info[base] & TLB_USER_WRITE)
{
return this.tlb_data[base] ^ addr;
}
else
{
return this.do_page_translation(addr, 1, 1) | addr & 0xFFF;
}
};
CPU.prototype.translate_address_user_read = function(addr)
{
var base = addr >>> 12;
if(this.tlb_info[base] & TLB_USER_READ)
{
return this.tlb_data[base] ^ addr;
}
else
{
return this.do_page_translation(addr, 0, 1) | addr & 0xFFF;
}
};
CPU.prototype.translate_address_system_write = function(addr)
{
var base = addr >>> 12;
if(this.tlb_info[base] & TLB_SYSTEM_WRITE)
{
return this.tlb_data[base] ^ addr;
}
else
{
return this.do_page_translation(addr, 1, 0) | addr & 0xFFF;
}
};
CPU.prototype.translate_address_system_read = function(addr)
{
var base = addr >>> 12;
if(this.tlb_info[base] & TLB_SYSTEM_READ)
{
return this.tlb_data[base] ^ addr;
}
else
{
return this.do_page_translation(addr, 0, 0) | addr & 0xFFF;
}
};
/**
* @return {number}
*/
CPU.prototype.do_page_translation = function(addr, for_writing, user)
{
var page = addr >>> 12,
page_dir_addr = (this.cr[3] >>> 2) + (page >> 10) | 0,
page_dir_entry = this.memory.mem32s[page_dir_addr],
high,
can_write = true,
global,
cachable = true,
allow_user = true;
dbg_assert(addr < 0x80000000);
if(!(page_dir_entry & 1))
{
// to do at this place:
//
// - set cr2 = addr (which caused the page fault)
// - call_interrupt_vector with id 14, error code 0-7 (requires information if read or write)
// - prevent execution of the function that triggered this call
//dbg_log("#PF not present", LOG_CPU);
this.cr[2] = addr;
this.trigger_pagefault(for_writing, user, 0);
// never reached as this.trigger_pagefault throws up
dbg_assert(false);
}
if((page_dir_entry & 2) === 0)
{
can_write = false;
if(for_writing && (user || (this.cr[0] & CR0_WP)))
{
this.cr[2] = addr;
this.trigger_pagefault(for_writing, user, 1);
dbg_assert(false);
}
}
if((page_dir_entry & 4) === 0)
{
allow_user = false;
if(user)
{
// "Page Fault: page table accessed by non-supervisor";
//dbg_log("#PF supervisor", LOG_CPU);
this.cr[2] = addr;
this.trigger_pagefault(for_writing, user, 1);
dbg_assert(false);
}
}
if(page_dir_entry & this.page_size_extensions)
{
// size bit is set
// set the accessed and dirty bits
this.memory.mem32s[page_dir_addr] = page_dir_entry | 0x20 | for_writing << 6;
high = (page_dir_entry & 0xFFC00000) | (addr & 0x3FF000);
global = page_dir_entry & 0x100;
}
else
{
var page_table_addr = ((page_dir_entry & 0xFFFFF000) >>> 2) + (page & 0x3FF) | 0,
page_table_entry = this.memory.mem32s[page_table_addr];
if((page_table_entry & 1) === 0)
{
//dbg_log("#PF not present table", LOG_CPU);
this.cr[2] = addr;
this.trigger_pagefault(for_writing, user, 0);
dbg_assert(false);
}
if((page_table_entry & 2) === 0)
{
can_write = false;
if(for_writing && (user || (this.cr[0] & CR0_WP)))
{
//dbg_log("#PF not writable page", LOG_CPU);
this.cr[2] = addr;
this.trigger_pagefault(for_writing, user, 1);
dbg_assert(false);
}
}
if((page_table_entry & 4) === 0)
{
allow_user = false;
if(user)
{
//dbg_log("#PF not supervisor page", LOG_CPU);
this.cr[2] = addr;
this.trigger_pagefault(for_writing, user, 1);
dbg_assert(false);
}
}
// set the accessed and dirty bits
this.memory.mem32s[page_dir_addr] = page_dir_entry | 0x20;
this.memory.mem32s[page_table_addr] = page_table_entry | 0x20 | for_writing << 6;
high = page_table_entry & 0xFFFFF000;
global = page_table_entry & 0x100;
}
this.tlb_data[page] = high ^ page << 12;
var allowed_flag;
if(allow_user)
{
if(can_write)
{
allowed_flag = TLB_SYSTEM_READ | TLB_SYSTEM_WRITE | TLB_USER_READ | TLB_USER_WRITE;
}
else
{
// TODO: Consider if cr0.wp is not set
allowed_flag = TLB_SYSTEM_READ | TLB_USER_READ;
}
}
else
{
if(can_write)
{
allowed_flag = TLB_SYSTEM_READ | TLB_SYSTEM_WRITE;
}
else
{
allowed_flag = TLB_SYSTEM_READ;
}
}
this.tlb_info[page] = allowed_flag;
if(global && (this.cr[4] & CR4_PGE))
{
this.tlb_info_global[page] = allowed_flag;
}
return high;
};
CPU.prototype.writable_or_pagefault = function(addr, size)
{
dbg_assert(size < 0x1000, "not supported yet");
dbg_assert(size > 0);
if(!this.paging)
{
return;
}
var user = this.cpl === 3 ? 1 : 0,
mask = user ? TLB_USER_WRITE : TLB_SYSTEM_WRITE,
page = addr >>> 12;
if((this.tlb_info[page] & mask) === 0)
{
this.do_page_translation(addr, 1, user);
}
if((addr & 0xFFF) + size - 1 >= 0x1000)
{
if((this.tlb_info[page + 1 | 0] & mask) === 0)
{
this.do_page_translation(addr + size - 1 | 0, 1, user);
}
}
};
CPU.prototype.trigger_pagefault = function(write, user, present)
{
//dbg_log("page fault w=" + write + " u=" + user + " p=" + present +
// " eip=" + h(this.previous_ip >>> 0, 8) +
// " cr2=" + h(this.cr[2] >>> 0, 8), LOG_CPU);
//dbg_trace(LOG_CPU);
// likely invalid pointer reference
//if((this.cr[2] >>> 0) < 0x100)
//{
// throw "stop";
//}
if(this.page_fault)
{
dbg_trace(LOG_CPU);
throw this.debug.unimpl("Double fault");
}
// invalidate tlb entry
var page = this.cr[2] >>> 12;
this.tlb_info[page] = 0;
this.tlb_info_global[page] = 0;
this.instruction_pointer = this.previous_ip;
this.page_fault = true;
this.call_interrupt_vector(14, false, user << 2 | write << 1 | present);
throw MAGIC_CPU_EXCEPTION;
};