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src.rivoreo.one / emulators / v86 / 910a80a65a26b70588d5a93cdf5bfa8844348ade / . / src / cpu.macro.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
*/
this.tlb_data = [];
/*
* Information about which pages are cached in the tlb.
* By bit:
* 0 system, read
* 1 system, write
* 2 user, read
* 3 user, write
*/
this.tlb_info = [];
/*
* Same as tlb_info, except it only contains global pages
*/
this.tlb_info_global = [];
/**
* 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;
/** @type {number} */
this.cr0 = 0;
/** @type {number} */
this.cr2 = 0;
/** @type {number} */
this.cr3 = 0;
/** @type {number} */
this.cr4 = 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;
// 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.table0F = [];
// paging enabled
/** @type {boolean} */
this.paging = false;
/** @type {number} */
this.instruction_pointer = 0;
/** @type {number} */
this.previous_ip = 0;
/** @type {!Object} */
this.bios = {};
/**
* @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;
// was the last instruction a jump?
this.last_instr_jump = false;
this.io = undefined;
this.fpu = undefined;
// it looks pointless to have this here, but
// Closure Compiler is able to remove unused functions
#include "debug.macro.js"
/** @const */
this._state_skip = [
"bios",
"debug",
"regv",
"table", "table0F",
"table16", "table32",
"table0F_16", "table0F_32",
"reg8", "reg8s",
"reg16", "reg16s", "reg32",
"tlb_data",
"tlb_info",
"tlb_info_global",
"timestamp_counter",
];
}
CPU.prototype._state_restore = function()
{
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();
if(this.stack_size_32)
{
this.stack_reg = this.reg32s;
}
else
{
this.stack_reg = this.reg16;
}
this.full_clear_tlb();
this.timestamp_counter = 0;
this.tsc_offset = v86.microtick();
};
#include "translate.macro.js"
#include "modrm.macro.js"
#include "arith.macro.js"
#include "string.macro.js"
#include "instructions.macro.js"
#include "misc_instr.macro.js"
CPU.prototype.main_run = function()
{
try
{
if(this.in_hlt)
{
this.hlt_loop();
}
else
{
this.do_run();
}
}
catch(e)
{
this.exception_cleanup(e);
}
};
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.repeat_string_prefix = REPEAT_STRING_PREFIX_NONE;
this.segment_prefix = SEG_PREFIX_NONE;
this.address_size_32 = this.is_32;
this.update_address_size();
this.operand_size_32 = this.is_32;
this.update_operand_size();
}
else
{
console.log(e);
console.log(e.stack);
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);
// 16 MB in total
this.tlb_data = new Int32Array(1 << 20);
this.tlb_info = new Uint8Array(1 << 20);
this.tlb_info_global = new Uint8Array(1 << 20);
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.cr0 = 1 << 30 | 1 << 29 | 1 << 4;
this.cr2 = 0;
this.cr3 = 0;
this.cr4 = 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;
};
CPU.prototype.init = function(settings)
{
this.memory_size = settings.memory_size || 1024 * 1024 * 64;
this.memory = new Memory(this.memory_size);
this.reset();
if(OP_TRANSLATION)
{
this.translator = new DynamicTranslator(this);
this.last_instr_jump = false;
}
var io = new IO(this.memory);
this.io = io;
this.bios = {
main: settings.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);
this.devices.dma = new DMA(this);
this.devices.acpi = new ACPI(this);
if(ENABLE_HPET)
{
this.devices.hpet = new HPET(this);
}
this.devices.vga = new VGAScreen(this,
settings.screen_adapter, settings.vga_memory_size || 8 * 1024 * 1024);
this.devices.ps2 = new PS2(this, settings.keyboard_adapter, settings.mouse_adapter);
this.fpu = new FPU(this);
if(settings.serial_adapter)
{
this.devices.uart = new UART(this, 0x3F8, settings.serial_adapter);
}
else
{
this.devices.uart = new UART(this, 0x3F8, {
put_chr: function(chr) { },
init: function(fn) { },
});
}
this.devices.fdc = new FloppyController(this, settings.fda, settings.fdb);
if(settings.cdrom)
{
this.devices.cdrom = new IDEDevice(this, settings.cdrom, true, 1);
}
if(settings.hda)
{
this.devices.hda = new IDEDevice(this, settings.hda, false, 0);
}
else
{
//this.devices.hda = new IDEDevice(this, undefined, false, 0);
}
//if(settings.hdb)
//{
// this.devices.hdb = hdb = new IDEDevice(this, settings.hdb, false, 1);
//}
this.devices.pit = new PIT(this);
this.devices.rtc = new RTC(this, this.devices.fdc.type, settings.boot_order || 0x213);
if(settings.network_adapter)
{
this.devices.net = new Ne2k(this, settings.network_adapter);
}
if(settings.fs9p)
{
this.devices.virtio = new VirtIO(this, settings.fs9p);
}
}
if(DEBUG)
{
this.debug.init();
}
};
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;
this.devices.vga.timer(now);
// 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.translator.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.timestamp_counter++;
this.previous_ip = this.instruction_pointer;
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.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)
{
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.devices.vga.timer(now);
//if(this.in_hlt)
//{
// var me = this;
// setTimeout(function() { me.hlt_loop(); }, 0);
//}
//else
//{
// this.next_tick();
//}
};
CPU.prototype.cr0_changed = function(old_cr0)
{
//dbg_log("cr0 = " + h(this.cr0 >>> 0), LOG_CPU);
var new_paging = (this.cr0 & CR0_PG) === CR0_PG;
if(!this.fpu)
{
// if there's no FPU, keep emulation set
this.cr0 |= CR0_EM;
}
this.cr0 |= 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.cr0 ^ 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;
};
// 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, high - 1);
}
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, value >> 8);
this.memory.write8(low + 2, value >> 16);
}
}
else
{
// 0xFFE
this.memory.write8(low + 1, 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) << 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) << 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), 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), 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 mask = 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);
mask |= flag_iopl;
// vip and vif are preserved
clear |= flag_vip | flag_vif;
}
else
{
if(!this.protected_mode) dbg_assert(this.cpl === 0);
if(this.cpl)
{
// cpl > 0
// cannot update iopl
mask |= flag_iopl;
if(this.cpl > this.getiopl())
{
// cpl > iopl
// can update interrupt flag but not iopl
mask |= flag_interrupt;
}
}
}
this.flags = (new_flags ^ ((this.flags ^ new_flags) & mask)) & clear | flags_default;
this.flags_changed = 0;
};
CPU.prototype.get_stack_pointer = function(mod)
{
return this.get_seg(reg_ss) + this.stack_reg[this.reg_vsp] + mod | 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 == 0x13)
//{
// dbg_log("INT 13");
// dbg_log(this.memory.read8(ch) + "/" + this.memory.read8(dh) + "/" + this.memory.read8(cl) + " |" + this.memory.read8(al));
// dbg_log("=> ", h(this.memory.read16(es) * 16 + this.memory.read16(bx)));
//}
//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.cr2 >>> 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.cr4 & 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) << 16,
selector = this.memory.read16(addr + 2),
type = this.memory.read8(addr + 5),
dpl = type >> 5 & 3,
is_trap;
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;
}
else if(type === 15)
{
is_trap = true;
}
else if(type === 5)
{
throw this.debug.unimpl("call int to task gate");
}
else if(type === 6)
{
throw this.debug.unimpl("16 bit interrupt gate");
}
else if(type === 7)
{
throw this.debug.unimpl("16 bit trap gate");
}
else
{
// invalid type
dbg_trace(LOG_CPU);
dbg_log("invalid type: " + h(type));
dbg_log(h(addr) + " " + h(base) + " " + 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
var tss_stack_addr = (info.dpl << 3) + 4;
if(tss_stack_addr + 5 > 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),
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();
}
this.cpl = info.dpl;
//dbg_log("int" + h(interrupt_nr, 2) +" from=" + h(this.instruction_pointer >>> 0, 8)
// + " cpl=" + 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.reg32s[reg_esp] = new_esp;
this.switch_seg(reg_ss, new_ss);
if(old_flags & flag_vm)
{
this.push32(this.sreg[reg_gs]);
this.push32(this.sreg[reg_fs]);
this.push32(this.sreg[reg_ds]);
this.push32(this.sreg[reg_es]);
}
this.push32(old_ss);
this.push32(old_esp);
}
else if(info.dc_bit || info.dpl === this.cpl)
{
if(this.flags & flag_vm)
{
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");
}
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(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);
}
if(error_code !== false)
{
dbg_assert(typeof error_code == "number");
this.push32(error_code);
}
// TODO
this.sreg[reg_cs] = selector;
//this.switch_seg(reg_cs);
dbg_assert(typeof info.size === "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]), 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
//debug.logop(this.instruction_pointer, "callu " + h(interrupt_nr) + "." + h(this.memory.read8(ah)));
//dbg_log("callu " + h(interrupt_nr) + "." +
// h(this.memory.read8(ah)) + " at " + h(this.instruction_pointer, 8), LOG_CPU, 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, this.memory.read16((interrupt_nr << 2) + 2));
this.instruction_pointer = this.get_seg(reg_cs) + this.memory.read16(interrupt_nr << 2) | 0;
}
this.last_instr_jump = true;
};
CPU.prototype.iret16 = function()
{
if(!this.protected_mode || (this.vm86_mode() && this.getiopl() === 3))
{
var ip = this.pop16();
this.switch_seg(reg_cs, this.pop16());
var new_flags = this.pop16();
this.instruction_pointer = ip + this.get_seg(reg_cs) | 0;
this.update_eflags(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");
}
this.last_instr_jump = true;
};
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();
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");
}
//dbg_log("pop eip from " + h(this.reg32[reg_esp], 8));
this.instruction_pointer = this.pop32s();
//dbg_log("IRET | from " + h(this.previous_ip >>> 0) + " to " + h(this.instruction_pointer >>> 0));
//this.debug.dump_regs_short();
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 + 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.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);
this.cpl = info.rpl;
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);
this.cpl_changed();
}
else
{
this.update_eflags(new_flags);
// same privilege return
//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();
this.last_instr_jump = true;
};
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);
};
/**
* @param {number} seg
*/
CPU.prototype.seg_prefix = function(seg)
{
dbg_assert(this.segment_prefix === SEG_PREFIX_NONE);
dbg_assert(seg >= 0 && seg <= 5);
this.segment_prefix = seg;
this.table[this.read_imm8()](this);
this.segment_prefix = SEG_PREFIX_NONE;
};
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);
dbg_assert(this.protected_mode || (this.sreg[segment] << 4) == this.segment_offsets[segment]);
if(this.protected_mode)
{
if(this.segment_is_null[segment])
{
// trying to access null segment
if(DEBUG)
{
dbg_log("Load null segment: " + h(segment), 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.handle_irqs = function()
{
if(this.devices.pic)
{
dbg_assert(!this.page_fault);
if((this.flags & flag_interrupt) && !this.page_fault)
{
this.devices.pic.check_irqs();
}
}
};
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)),
high_port = port + size - 1;
if(tsr_size >= iomap_base + (high_port >> 3))
{
var mask = ((1 << size) - 1) << (port & 7),
addr = this.translate_address_system_read(tsr_offset + iomap_base + (port >> 3)),
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 = 0;
ecx = 1 << 23; // popcnt
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
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 = 0x0c000121;
ebx = 0x01c0003f;
ecx = 0x0000003f;
edx = 0x00000001;
break;
case 1:
eax = 0x0c000122;
ebx = 0x01c0003f;
ecx = 0x0000003f;
edx = 0x00000001;
break
case 2:
eax = 0x0c004143;
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);
}
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.table0F = this.table0F_32;
}
else
{
this.table = this.table16;
this.table0F = this.table0F_16;
}
};
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)
{
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) | this.memory.read8(table_offset + 4) << 16 |
this.memory.read8(table_offset + 7) << 24,
info.access = this.memory.read8(table_offset + 5),
info.flags = this.memory.read8(table_offset + 6) >> 4,
// 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) & 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.cr0 & CR0_PE) === CR0_PE;
}
if(!this.protected_mode || this.vm86_mode())
{
this.sreg[reg] = selector;
this.segment_is_null[reg] = 0;
this.segment_limits[reg] = 0xFFFFF;
this.segment_offsets[reg] = selector << 4;
return;
}
var info = this.lookup_segment_selector(selector);
if(reg === reg_ss)
{
if(info.is_null)
{
this.trigger_gp(0);
return false;
}
if(!info.is_valid ||
info.is_system ||
info.rpl !== this.cpl ||
!info.is_writable ||
info.dpl !== this.cpl)
{
this.trigger_gp(selector & ~3);
return false;
}
if(!info.is_present)
{
this.trigger_ss(selector & ~3);
return false;
}
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);
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)
{
this.sreg[reg] = selector;
this.segment_is_null[reg] = 1;
return true;
}
if(!info.is_valid ||
info.is_system ||
!info.is_readable ||
((!info.is_executable || !info.dc_bit) &&
info.rpl > info.dpl &&
this.cpl > info.dpl))
{
this.trigger_gp(selector & ~3);
return false;
}
if(!info.is_present)
{
this.trigger_np(selector & ~3);
return false;
}
}
//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;
return true;
};
CPU.prototype.load_tr = function(selector)
{
var info = this.lookup_segment_selector(selector);
//dbg_log("load tr");
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)
{
dbg_log("#GP | ltr: invalid type (type = " + 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, this.memory.read8(info.table_offset + 5) | 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.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.cr3 >>> 2) + (page >> 10),
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.cr2 = 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.cr0 & CR0_WP)))
{
this.cr2 = 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.cr2 = 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),
page_table_entry = this.memory.mem32s[page_table_addr];
if((page_table_entry & 1) === 0)
{
//dbg_log("#PF not present table", LOG_CPU);
this.cr2 = 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.cr0 & CR0_WP)))
{
//dbg_log("#PF not writable page", LOG_CPU);
this.cr2 = 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.cr2 = 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.cr4 & 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] & mask) === 0)
{
this.do_page_translation(addr + size - 1, 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.cr2 >>> 0, 8), LOG_CPU);
//dbg_trace(LOG_CPU);
// likely invalid pointer reference
//if((this.cr2 >>> 0) < 0x100)
//{
// throw "stop";
//}
if(this.page_fault)
{
dbg_trace(LOG_CPU);
throw this.debug.unimpl("Double fault");
}
// invalidate tlb entry
var page = this.cr2 >>> 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;
};