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v86 / src /rust /cpu /cpu.rs
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 #![allow(non_upper_case_globals)]
use crate::config;
use crate::cpu::fpu::fpu_set_tag_word;
use crate::cpu::global_pointers::*;
use crate::cpu::memory;
use crate::cpu::misc_instr::{
adjust_stack_reg, get_stack_pointer, getaf, getcf, getof, getpf, getsf, getzf, pop16, pop32s,
push16, push32,
};
use crate::cpu::modrm::{resolve_modrm16, resolve_modrm32};
use crate::cpu::{apic, ioapic, pic};
use crate::dbg::dbg_trace;
use crate::gen;
use crate::jit;
use crate::jit::is_near_end_of_page;
use crate::opstats;
use crate::page::Page;
use crate::paging::OrPageFault;
use crate::prefix;
use crate::profiler;
use crate::profiler::stat;
use crate::softfloat;
use crate::state_flags::CachedStateFlags;
use std::collections::HashSet;
use std::ptr;
mod wasm {
extern "C" {
pub fn call_indirect1(f: i32, x: u16);
}
}
pub mod js {
extern "C" {
pub fn cpu_exception_hook(interrupt: i32) -> bool;
pub fn microtick() -> f64;
pub fn run_hardware_timers(acpi_enabled: bool, t: f64) -> f64;
pub fn cpu_event_halt();
pub fn stop_idling();
pub fn io_port_read8(port: i32) -> i32;
pub fn io_port_read16(port: i32) -> i32;
pub fn io_port_read32(port: i32) -> i32;
pub fn io_port_write8(port: i32, value: i32);
pub fn io_port_write16(port: i32, value: i32);
pub fn io_port_write32(port: i32, value: i32);
pub fn get_rand_int() -> i32;
}
}
/// The offset for our generated functions in the wasm table. Every index less than this is
/// reserved for rustc's indirect functions
pub const WASM_TABLE_OFFSET: u32 = 1024;
#[derive(Copy, Clone)]
#[repr(C)]
#[repr(align(16))]
pub union reg128 {
pub i8: [i8; 16],
pub i16: [i16; 8],
pub i32: [i32; 4],
pub i64: [i64; 2],
pub u8: [u8; 16],
pub u16: [u16; 8],
pub u32: [u32; 4],
pub u64: [u64; 2],
pub f32: [f32; 4],
pub f64: [f64; 2],
}
pub const CHECK_MISSED_ENTRY_POINTS: bool = false;
pub const INTERPRETER_ITERATION_LIMIT: u32 = 100_001;
// How often, in milliseconds, to yield to the browser for rendering and running events
pub const TIME_PER_FRAME: f64 = 1.0;
pub const FLAG_SUB: i32 = -0x8000_0000;
pub const FLAG_CARRY: i32 = 1;
pub const FLAG_PARITY: i32 = 4;
pub const FLAG_ADJUST: i32 = 16;
pub const FLAG_ZERO: i32 = 64;
pub const FLAG_SIGN: i32 = 128;
pub const FLAG_TRAP: i32 = 256;
pub const FLAG_INTERRUPT: i32 = 512;
pub const FLAG_DIRECTION: i32 = 1024;
pub const FLAG_OVERFLOW: i32 = 2048;
pub const FLAG_IOPL: i32 = 1 << 12 | 1 << 13;
pub const FLAG_NT: i32 = 1 << 14;
pub const FLAG_RF: i32 = 1 << 16;
pub const FLAG_VM: i32 = 1 << 17;
pub const FLAG_AC: i32 = 1 << 18;
pub const FLAG_VIF: i32 = 1 << 19;
pub const FLAG_VIP: i32 = 1 << 20;
pub const FLAG_ID: i32 = 1 << 21;
pub const FLAGS_DEFAULT: i32 = 1 << 1;
pub const FLAGS_MASK: i32 = FLAG_CARRY
| FLAG_PARITY
| FLAG_ADJUST
| FLAG_ZERO
| FLAG_SIGN
| FLAG_TRAP
| FLAG_INTERRUPT
| FLAG_DIRECTION
| FLAG_OVERFLOW
| FLAG_IOPL
| FLAG_NT
| FLAG_RF
| FLAG_VM
| FLAG_AC
| FLAG_VIF
| FLAG_VIP
| FLAG_ID;
pub const FLAGS_ALL: i32 =
FLAG_CARRY | FLAG_PARITY | FLAG_ADJUST | FLAG_ZERO | FLAG_SIGN | FLAG_OVERFLOW;
pub const OPSIZE_8: i32 = 7;
pub const OPSIZE_16: i32 = 15;
pub const OPSIZE_32: i32 = 31;
pub const EAX: i32 = 0;
pub const ECX: i32 = 1;
pub const EDX: i32 = 2;
pub const EBX: i32 = 3;
pub const ESP: i32 = 4;
pub const EBP: i32 = 5;
pub const ESI: i32 = 6;
pub const EDI: i32 = 7;
pub const AX: i32 = 0;
pub const CX: i32 = 1;
pub const DX: i32 = 2;
pub const BX: i32 = 3;
pub const SP: i32 = 4;
pub const BP: i32 = 5;
pub const SI: i32 = 6;
pub const DI: i32 = 7;
pub const AL: i32 = 0;
pub const CL: i32 = 1;
pub const DL: i32 = 2;
pub const BL: i32 = 3;
pub const AH: i32 = 4;
pub const CH: i32 = 5;
pub const DH: i32 = 6;
pub const BH: i32 = 7;
pub const ES: i32 = 0;
pub const CS: i32 = 1;
pub const SS: i32 = 2;
pub const DS: i32 = 3;
pub const FS: i32 = 4;
pub const GS: i32 = 5;
pub const TR: i32 = 6;
pub const LDTR: i32 = 7;
pub const PAGE_TABLE_PRESENT_MASK: i32 = 1 << 0;
pub const PAGE_TABLE_RW_MASK: i32 = 1 << 1;
pub const PAGE_TABLE_USER_MASK: i32 = 1 << 2;
pub const PAGE_TABLE_ACCESSED_MASK: i32 = 1 << 5;
pub const PAGE_TABLE_DIRTY_MASK: i32 = 1 << 6;
pub const PAGE_TABLE_PSE_MASK: i32 = 1 << 7;
pub const PAGE_TABLE_GLOBAL_MASK: i32 = 1 << 8;
pub const MMAP_BLOCK_BITS: i32 = 17;
pub const MMAP_BLOCK_SIZE: i32 = 1 << MMAP_BLOCK_BITS;
pub const CR0_PE: i32 = 1;
pub const CR0_MP: i32 = 1 << 1;
pub const CR0_EM: i32 = 1 << 2;
pub const CR0_TS: i32 = 1 << 3;
pub const CR0_ET: i32 = 1 << 4;
pub const CR0_WP: i32 = 1 << 16;
pub const CR0_AM: i32 = 1 << 18;
pub const CR0_NW: i32 = 1 << 29;
pub const CR0_CD: i32 = 1 << 30;
pub const CR0_PG: i32 = 1 << 31;
pub const CR4_VME: i32 = 1;
pub const CR4_PVI: i32 = 1 << 1;
pub const CR4_TSD: i32 = 1 << 2;
pub const CR4_PSE: i32 = 1 << 4;
pub const CR4_DE: i32 = 1 << 3;
pub const CR4_PAE: i32 = 1 << 5;
pub const CR4_PGE: i32 = 1 << 7;
pub const CR4_OSFXSR: i32 = 1 << 9;
pub const CR4_OSXMMEXCPT: i32 = 1 << 10;
pub const CR4_SMEP: i32 = 1 << 20;
pub const TSR_BACKLINK: i32 = 0x00;
pub const TSR_CR3: i32 = 0x1C;
pub const TSR_EIP: i32 = 0x20;
pub const TSR_EFLAGS: i32 = 0x24;
pub const TSR_EAX: i32 = 0x28;
pub const TSR_ECX: i32 = 0x2c;
pub const TSR_EDX: i32 = 0x30;
pub const TSR_EBX: i32 = 0x34;
pub const TSR_ESP: i32 = 0x38;
pub const TSR_EBP: i32 = 0x3c;
pub const TSR_ESI: i32 = 0x40;
pub const TSR_EDI: i32 = 0x44;
pub const TSR_ES: i32 = 0x48;
pub const TSR_CS: i32 = 0x4c;
pub const TSR_SS: i32 = 0x50;
pub const TSR_DS: i32 = 0x54;
pub const TSR_FS: i32 = 0x58;
pub const TSR_GS: i32 = 0x5c;
pub const TSR_LDT: i32 = 0x60;
pub const IA32_TIME_STAMP_COUNTER: i32 = 0x10;
pub const IA32_PLATFORM_ID: i32 = 0x17;
pub const IA32_APIC_BASE: i32 = 0x1B;
pub const MSR_TEST_CTRL: i32 = 0x33;
pub const MSR_SMI_COUNT: i32 = 0x34;
pub const IA32_FEAT_CTL: i32 = 0x3A;
pub const IA32_SPEC_CTRL: i32 = 0x48;
pub const IA32_BIOS_UPDT_TRIG: i32 = 0x79;
pub const IA32_BIOS_SIGN_ID: i32 = 0x8B;
pub const IA32_PMC0: i32 = 0xC1;
pub const IA32_PMC1: i32 = 0xC2;
pub const MSR_PLATFORM_INFO: i32 = 0xCE;
pub const MSR_TSX_FORCE_ABORT: i32 = 0x10F;
pub const IA32_TSX_CTRL: i32 = 0x122;
pub const IA32_MCU_OPT_CTRL: i32 = 0x123;
pub const MISC_FEATURE_ENABLES: i32 = 0x140;
pub const IA32_SYSENTER_CS: i32 = 0x174;
pub const IA32_SYSENTER_ESP: i32 = 0x175;
pub const IA32_SYSENTER_EIP: i32 = 0x176;
pub const IA32_MCG_CAP: i32 = 0x179;
pub const IA32_PERFEVTSEL0: i32 = 0x186;
pub const IA32_PERFEVTSEL1: i32 = 0x187;
pub const IA32_MISC_ENABLE: i32 = 0x1A0;
pub const IA32_PAT: i32 = 0x277;
pub const IA32_RTIT_CTL: i32 = 0x570;
pub const MSR_PKG_C2_RESIDENCY: i32 = 0x60D;
pub const IA32_KERNEL_GS_BASE: i32 = 0xC0000101u32 as i32;
pub const MSR_AMD64_LS_CFG: i32 = 0xC0011020u32 as i32;
pub const MSR_AMD64_DE_CFG: i32 = 0xC0011029u32 as i32;
pub const IA32_APIC_BASE_BSP: i32 = 1 << 8;
pub const IA32_APIC_BASE_EXTD: i32 = 1 << 10;
pub const IA32_APIC_BASE_EN: i32 = 1 << 11;
pub const IOAPIC_MEM_ADDRESS: u32 = 0xFEC00000;
pub const IOAPIC_MEM_SIZE: u32 = 32;
pub const APIC_MEM_ADDRESS: u32 = 0xFEE00000;
pub const APIC_MEM_SIZE: u32 = 0x1000;
pub const MXCSR_MASK: i32 = 0xffff;
pub const MXCSR_FZ: i32 = 1 << 15;
pub const MXCSR_DAZ: i32 = 1 << 6;
pub const MXCSR_RC_SHIFT: i32 = 13;
pub const VALID_TLB_ENTRY_MAX: i32 = 10000;
pub const TLB_VALID: i32 = 1 << 0;
pub const TLB_READONLY: i32 = 1 << 1;
pub const TLB_NO_USER: i32 = 1 << 2;
pub const TLB_IN_MAPPED_RANGE: i32 = 1 << 3;
pub const TLB_GLOBAL: i32 = 1 << 4;
pub const TLB_HAS_CODE: i32 = 1 << 5;
pub const IVT_SIZE: u32 = 0x400;
pub const CPU_EXCEPTION_DE: i32 = 0;
pub const CPU_EXCEPTION_DB: i32 = 1;
pub const CPU_EXCEPTION_NMI: i32 = 2;
pub const CPU_EXCEPTION_BP: i32 = 3;
pub const CPU_EXCEPTION_OF: i32 = 4;
pub const CPU_EXCEPTION_BR: i32 = 5;
pub const CPU_EXCEPTION_UD: i32 = 6;
pub const CPU_EXCEPTION_NM: i32 = 7;
pub const CPU_EXCEPTION_DF: i32 = 8;
pub const CPU_EXCEPTION_TS: i32 = 10;
pub const CPU_EXCEPTION_NP: i32 = 11;
pub const CPU_EXCEPTION_SS: i32 = 12;
pub const CPU_EXCEPTION_GP: i32 = 13;
pub const CPU_EXCEPTION_PF: i32 = 14;
pub const CPU_EXCEPTION_MF: i32 = 16;
pub const CPU_EXCEPTION_AC: i32 = 17;
pub const CPU_EXCEPTION_MC: i32 = 18;
pub const CPU_EXCEPTION_XM: i32 = 19;
pub const CPU_EXCEPTION_VE: i32 = 20;
pub const CHECK_TLB_INVARIANTS: bool = false;
pub const DEBUG: bool = cfg!(debug_assertions);
pub const LOOP_COUNTER: i32 = 100_003;
// should probably be kept in sync with APIC_TIMER_FREQ in apic.js
pub const TSC_RATE: f64 = 1_000_000.0;
pub static mut cpuid_level: u32 = 0x16;
pub static mut jit_block_boundary: bool = false;
const TSC_ENABLE_IMPRECISE_BROWSER_WORKAROUND: bool = true;
#[cfg(debug_assertions)]
const TSC_VERBOSE_LOGGING: bool = false;
#[cfg(debug_assertions)]
pub static mut tsc_last_extra: u64 = 0;
// the last value returned by rdtsc
pub static mut tsc_last_value: u64 = 0;
// the smallest difference between two rdtsc readings (depends on the browser's performance.now resolution)
pub static mut tsc_resolution: u64 = u64::MAX;
// how many times rdtsc was called and had to return the same value (due to browser's performance.now resolution)
pub static mut tsc_number_of_same_readings: u64 = 0;
// how often rdtsc was previously called without its value changing, used for interpolating quick
// consecutive calls between rdtsc (when it's called faster than the browser's performance.now
// changes)
pub static mut tsc_speed: u64 = 1;
// used for restoring the state
pub static mut tsc_offset: u64 = 0;
pub struct Code {
pub wasm_table_index: jit::WasmTableIndex,
pub state_flags: CachedStateFlags,
pub state_table: [u16; 0x1000],
}
pub static mut tlb_data: [i32; 0x100000] = [0; 0x100000];
pub static mut tlb_code: [Option<ptr::NonNull<Code>>; 0x100000] = [None; 0x100000];
pub static mut valid_tlb_entries: [i32; 10000] = [0; 10000];
pub static mut valid_tlb_entries_count: i32 = 0;
pub static mut in_jit: bool = false;
pub static mut jit_fault: Option<(i32, Option<i32>)> = None;
pub enum LastJump {
Interrupt {
phys_addr: u32,
int: u8,
software: bool,
error: Option<u32>,
},
Compiled {
phys_addr: u32,
},
Interpreted {
phys_addr: u32,
},
None,
}
impl LastJump {
pub fn phys_address(&self) -> Option<u32> {
match self {
LastJump::Interrupt { phys_addr, .. } => Some(*phys_addr),
LastJump::Compiled { phys_addr } => Some(*phys_addr),
LastJump::Interpreted { phys_addr } => Some(*phys_addr),
LastJump::None => None,
}
}
pub fn name(&self) -> &'static str {
match self {
LastJump::Interrupt { .. } => "interrupt",
LastJump::Compiled { .. } => "compiled",
LastJump::Interpreted { .. } => "interpreted",
LastJump::None => "none",
}
}
}
pub static mut debug_last_jump: LastJump = LastJump::None;
#[derive(Copy, Clone)]
pub struct SegmentSelector {
raw: u16,
}
impl SegmentSelector {
pub fn of_u16(raw: u16) -> SegmentSelector { SegmentSelector { raw } }
pub fn rpl(&self) -> u8 { (self.raw & 3) as u8 }
pub fn is_gdt(&self) -> bool { (self.raw & 4) == 0 }
pub fn descriptor_offset(&self) -> u16 { (self.raw & !7) as u16 }
pub fn is_null(&self) -> bool { self.is_gdt() && self.descriptor_offset() == 0 }
}
// Used to indicate early that the selector cannot be used to fetch a descriptor
#[derive(PartialEq)]
pub enum SelectorNullOrInvalid {
IsNull,
OutsideOfTableLimit,
}
pub struct SegmentDescriptor {
pub raw: u64,
}
impl SegmentDescriptor {
pub fn of_u64(raw: u64) -> SegmentDescriptor { SegmentDescriptor { raw } }
pub fn base(&self) -> i32 {
((self.raw >> 16) & 0xffff | (self.raw & 0xff_00000000) >> 16 | (self.raw >> 56 << 24))
as i32
}
pub fn limit(&self) -> u32 { (self.raw & 0xffff | ((self.raw >> 48) & 0xf) << 16) as u32 }
pub fn access_byte(&self) -> u8 { ((self.raw >> 40) & 0xff) as u8 }
pub fn flags(&self) -> u8 { ((self.raw >> 48 >> 4) & 0xf) as u8 }
pub fn is_system(&self) -> bool { self.access_byte() & 0x10 == 0 }
pub fn system_type(&self) -> u8 { self.access_byte() & 0xF }
pub fn accessed(&self) -> bool { self.access_byte() & 1 == 1 }
pub fn is_rw(&self) -> bool { self.access_byte() & 2 == 2 }
pub fn is_dc(&self) -> bool { self.access_byte() & 4 == 4 }
pub fn is_executable(&self) -> bool { self.access_byte() & 8 == 8 }
pub fn is_present(&self) -> bool { self.access_byte() & 0x80 == 0x80 }
pub fn is_writable(&self) -> bool { self.is_rw() && !self.is_executable() }
pub fn is_readable(&self) -> bool { self.is_rw() || !self.is_executable() }
pub fn is_conforming_executable(&self) -> bool { self.is_dc() && self.is_executable() }
pub fn dpl(&self) -> u8 { (self.access_byte() >> 5) & 3 }
pub fn is_32(&self) -> bool { self.flags() & 4 == 4 }
pub fn effective_limit(&self) -> u32 {
if self.flags() & 8 == 8 {
self.limit() << 12 | 0xFFF
}
else {
self.limit()
}
}
pub fn set_busy(&self) -> SegmentDescriptor {
SegmentDescriptor {
raw: self.raw | 2 << 40,
}
}
pub fn set_accessed(&self) -> SegmentDescriptor {
SegmentDescriptor {
raw: self.raw | 1 << 40,
}
}
}
pub struct InterruptDescriptor {
raw: u64,
}
impl InterruptDescriptor {
pub fn of_u64(raw: u64) -> InterruptDescriptor { InterruptDescriptor { raw } }
pub fn offset(&self) -> i32 { (self.raw & 0xffff | self.raw >> 32 & 0xffff0000) as i32 }
pub fn selector(&self) -> u16 { (self.raw >> 16 & 0xffff) as u16 }
pub fn access_byte(&self) -> u8 { (self.raw >> 40 & 0xff) as u8 }
pub fn dpl(&self) -> u8 { (self.access_byte() >> 5 & 3) as u8 }
pub fn gate_type(&self) -> u8 { self.access_byte() & 7 }
pub fn is_32(&self) -> bool { self.access_byte() & 8 == 8 }
pub fn is_present(&self) -> bool { self.access_byte() & 0x80 == 0x80 }
pub fn reserved_zeros_are_valid(&self) -> bool { self.access_byte() & 16 == 0 }
const TASK_GATE: u8 = 0b101;
const INTERRUPT_GATE: u8 = 0b110;
const TRAP_GATE: u8 = 0b111;
}
pub unsafe fn switch_cs_real_mode(selector: i32) {
dbg_assert!(!*protected_mode || vm86_mode());
*sreg.offset(CS as isize) = selector as u16;
*segment_is_null.offset(CS as isize) = false;
*segment_offsets.offset(CS as isize) = selector << 4;
update_cs_size(false);
}
unsafe fn get_tss_ss_esp(dpl: u8) -> OrPageFault<(i32, i32)> {
Ok(if *tss_size_32 {
let tss_stack_offset = ((dpl << 3) + 4) as u32;
if tss_stack_offset + 7 > *segment_limits.offset(TR as isize) {
panic!("#TS handler");
}
let addr = translate_address_system_read(
*segment_offsets.offset(TR as isize) + tss_stack_offset as i32,
)?;
dbg_assert!(addr & 0xFFF <= 0x1000 - 6);
(memory::read16(addr + 4), memory::read32s(addr))
}
else {
let tss_stack_offset = ((dpl << 2) + 2) as u32;
if tss_stack_offset + 3 > *segment_limits.offset(TR as isize) {
panic!("#TS handler");
}
let addr = translate_address_system_read(
*segment_offsets.offset(TR as isize) + tss_stack_offset as i32,
)?;
dbg_assert!(addr & 0xFFF <= 0x1000 - 4);
(memory::read16(addr + 2), memory::read16(addr))
})
}
pub unsafe fn iret16() { iret(true); }
pub unsafe fn iret32() { iret(false); }
pub unsafe fn iret(is_16: bool) {
if vm86_mode() && getiopl() < 3 {
// vm86 mode, iopl != 3
dbg_log!("#gp iret vm86 mode, iopl != 3");
trigger_gp(0);
return;
}
let (new_eip, new_cs, mut new_flags) = if is_16 {
(
return_on_pagefault!(safe_read16(get_stack_pointer(0))),
return_on_pagefault!(safe_read16(get_stack_pointer(2))),
return_on_pagefault!(safe_read16(get_stack_pointer(4))),
)
}
else {
(
return_on_pagefault!(safe_read32s(get_stack_pointer(0))),
return_on_pagefault!(safe_read16(get_stack_pointer(4))),
return_on_pagefault!(safe_read32s(get_stack_pointer(8))),
)
};
if !*protected_mode || (vm86_mode() && getiopl() == 3) {
if new_eip as u32 & 0xFFFF0000 != 0 {
panic!("#GP handler");
}
switch_cs_real_mode(new_cs);
*instruction_pointer = get_seg_cs() + new_eip;
if is_16 {
update_eflags(new_flags | *flags & !0xFFFF);
adjust_stack_reg(3 * 2);
}
else {
if !*protected_mode {
update_eflags((new_flags & 0x257FD5) | (*flags & 0x1A0000));
}
else {
update_eflags(new_flags);
}
adjust_stack_reg(3 * 4);
}
update_state_flags();
handle_irqs();
return;
}
dbg_assert!(!vm86_mode());
if *flags & FLAG_NT != 0 {
if DEBUG {
panic!("NT");
}
trigger_gp(0);
return;
}
if new_flags & FLAG_VM != 0 {
if *cpl == 0 {
// return to virtual 8086 mode
// vm86 cannot be set in 16 bit flag
dbg_assert!(!is_16);
let temp_esp = return_on_pagefault!(safe_read32s(get_stack_pointer(12)));
let temp_ss = return_on_pagefault!(safe_read16(get_stack_pointer(16)));
let new_es = return_on_pagefault!(safe_read16(get_stack_pointer(20)));
let new_ds = return_on_pagefault!(safe_read16(get_stack_pointer(24)));
let new_fs = return_on_pagefault!(safe_read16(get_stack_pointer(28)));
let new_gs = return_on_pagefault!(safe_read16(get_stack_pointer(32)));
// no exceptions below
update_eflags(new_flags);
*flags |= FLAG_VM;
switch_cs_real_mode(new_cs);
*instruction_pointer = get_seg_cs() + (new_eip & 0xFFFF);
if !switch_seg(ES, new_es)
|| !switch_seg(DS, new_ds)
|| !switch_seg(FS, new_fs)
|| !switch_seg(GS, new_gs)
{
// XXX: Should be checked before side effects
dbg_assert!(false);
}
adjust_stack_reg(9 * 4); // 9 dwords: eip, cs, flags, esp, ss, es, ds, fs, gs
write_reg32(ESP, temp_esp);
if !switch_seg(SS, temp_ss) {
// XXX
dbg_assert!(false);
}
*cpl = 3;
cpl_changed();
update_cs_size(false);
update_state_flags();
// iret end
return;
}
else {
dbg_log!("vm86 flag ignored because cpl != 0");
new_flags &= !FLAG_VM;
}
}
// protected mode return
let cs_selector = SegmentSelector::of_u16(new_cs as u16);
let cs_descriptor = match return_on_pagefault!(lookup_segment_selector(cs_selector)) {
Ok((desc, _)) => desc,
Err(SelectorNullOrInvalid::IsNull) => panic!("Unimplemented: CS selector is null"),
Err(SelectorNullOrInvalid::OutsideOfTableLimit) => {
panic!("Unimplemented: CS selector is invalid")
},
};
if new_eip as u32 > cs_descriptor.effective_limit() {
dbg_log!(
"#gp iret: new_eip > cs_descriptor.effective_limit, new_eip={:x} cs_descriptor.effective_limit={:x}",
new_eip as u32,
cs_descriptor.effective_limit()
);
trigger_gp(new_cs & !3);
return;
}
if !cs_descriptor.is_present() {
panic!("not present");
}
if !cs_descriptor.is_executable() {
panic!("not exec");
}
if cs_selector.rpl() < *cpl {
panic!("rpl < cpl");
}
if cs_descriptor.is_dc() && cs_descriptor.dpl() > cs_selector.rpl() {
panic!("conforming and dpl > rpl");
}
if !cs_descriptor.is_dc() && cs_selector.rpl() != cs_descriptor.dpl() {
dbg_log!(
"#gp iret: non-conforming cs and rpl != dpl, dpl={} rpl={}",
cs_descriptor.dpl(),
cs_selector.rpl()
);
trigger_gp(new_cs & !3);
return;
}
if cs_selector.rpl() > *cpl {
// outer privilege return
let (temp_esp, temp_ss) = if is_16 {
(
return_on_pagefault!(safe_read16(get_stack_pointer(6))),
return_on_pagefault!(safe_read16(get_stack_pointer(8))),
)
}
else {
(
return_on_pagefault!(safe_read32s(get_stack_pointer(12))),
return_on_pagefault!(safe_read16(get_stack_pointer(16))),
)
};
let ss_selector = SegmentSelector::of_u16(temp_ss as u16);
let ss_descriptor = match return_on_pagefault!(lookup_segment_selector(ss_selector)) {
Ok((desc, _)) => desc,
Err(SelectorNullOrInvalid::IsNull) => {
dbg_log!("#GP for loading 0 in SS sel={:x}", temp_ss);
dbg_trace();
trigger_gp(0);
return;
},
Err(SelectorNullOrInvalid::OutsideOfTableLimit) => {
dbg_log!("#GP for loading invalid in SS sel={:x}", temp_ss);
trigger_gp(temp_ss & !3);
return;
},
};
let new_cpl = cs_selector.rpl();
if ss_descriptor.is_system()
|| ss_selector.rpl() != new_cpl
|| !ss_descriptor.is_writable()
|| ss_descriptor.dpl() != new_cpl
{
dbg_log!("#GP for loading invalid in SS sel={:x}", temp_ss);
dbg_trace();
trigger_gp(temp_ss & !3);
return;
}
if !ss_descriptor.is_present() {
dbg_log!("#SS for loading non-present in SS sel={:x}", temp_ss);
dbg_trace();
trigger_ss(temp_ss & !3);
return;
}
// no exceptions below
if is_16 {
update_eflags(new_flags | *flags & !0xFFFF);
}
else {
update_eflags(new_flags);
}
*cpl = cs_selector.rpl();
cpl_changed();
if !switch_seg(SS, temp_ss) {
// XXX
dbg_assert!(false);
}
set_stack_reg(temp_esp);
if *cpl == 0 && !is_16 {
*flags = *flags & !FLAG_VIF & !FLAG_VIP | (new_flags & (FLAG_VIF | FLAG_VIP));
}
for reg in [ES, DS, FS, GS] {
let access = *segment_access_bytes.offset(reg as isize);
let dpl = access >> 5 & 3;
let executable = access & 8 == 8;
let conforming = access & 4 == 4;
if dpl < *cpl && !(executable && conforming) {
//dbg_log!(
// "set segment to null sreg={} dpl={} executable={} conforming={}",
// reg,
// dpl,
// executable,
// conforming
//);
*segment_is_null.offset(reg as isize) = true;
*sreg.offset(reg as isize) = 0;
}
}
}
else if cs_selector.rpl() == *cpl {
// same privilege return
// no exceptions below
if is_16 {
adjust_stack_reg(3 * 2);
update_eflags(new_flags | *flags & !0xFFFF);
}
else {
adjust_stack_reg(3 * 4);
update_eflags(new_flags);
}
// update vip and vif, which are not changed by update_eflags
if *cpl == 0 && !is_16 {
*flags = *flags & !FLAG_VIF & !FLAG_VIP | (new_flags & (FLAG_VIF | FLAG_VIP));
}
}
else {
dbg_assert!(false);
}
*sreg.offset(CS as isize) = new_cs as u16;
dbg_assert!((new_cs & 3) == *cpl as i32);
update_cs_size(cs_descriptor.is_32());
*segment_limits.offset(CS as isize) = cs_descriptor.effective_limit();
*segment_offsets.offset(CS as isize) = cs_descriptor.base();
*segment_access_bytes.offset(CS as isize) = cs_descriptor.access_byte();
*instruction_pointer = new_eip + get_seg_cs();
update_state_flags();
// iret end
handle_irqs();
}
pub unsafe fn call_interrupt_vector(
interrupt_nr: i32,
is_software_int: bool,
error_code: Option<i32>,
) {
if *protected_mode {
if vm86_mode() && *cr.offset(4) & CR4_VME != 0 {
panic!("Unimplemented: VME");
}
if vm86_mode() && is_software_int && getiopl() < 3 {
dbg_log!("call_interrupt_vector #GP. vm86 && software int && iopl < 3");
dbg_trace();
trigger_gp(0);
return;
}
if interrupt_nr << 3 | 7 > *idtr_size {
dbg_log!("interrupt_nr={:x} idtr_size={:x}", interrupt_nr, *idtr_size);
dbg_trace();
panic!("Unimplemented: #GP handler");
}
let descriptor_address = return_on_pagefault!(translate_address_system_read(
*idtr_offset + (interrupt_nr << 3)
));
let descriptor = InterruptDescriptor::of_u64(memory::read64s(descriptor_address) as u64);
let mut offset = descriptor.offset();
let selector = descriptor.selector() as i32;
let dpl = descriptor.dpl();
let gate_type = descriptor.gate_type();
if is_software_int && dpl < *cpl {
dbg_log!("#gp software interrupt ({:x}) and dpl < cpl", interrupt_nr);
dbg_trace();
trigger_gp(interrupt_nr << 3 | 2);
return;
}
if gate_type != InterruptDescriptor::TRAP_GATE
&& gate_type != InterruptDescriptor::INTERRUPT_GATE
&& gate_type != InterruptDescriptor::TASK_GATE
{
// invalid gate_type
dbg_log!(
"gate type invalid. gate_type=0b{:b} raw={:b}",
gate_type,
descriptor.raw
);
dbg_trace();
panic!("Unimplemented: #GP handler");
}
if !descriptor.reserved_zeros_are_valid() {
dbg_log!(
"reserved 0s violated. gate_type=0b{:b} raw={:b}",
gate_type,
descriptor.raw
);
dbg_trace();
panic!("Unimplemented: #GP handler");
}
if !descriptor.is_present() {
// present bit not set
dbg_log!("#np int descriptor not present, int={}", interrupt_nr);
trigger_np(interrupt_nr << 3 | 2);
return;
}
if gate_type == InterruptDescriptor::TASK_GATE {
// task gate
dbg_log!(
"interrupt to task gate: int={:x} sel={:x} dpl={}",
interrupt_nr,
selector,
dpl
);
dbg_trace();
dbg_assert!(descriptor.is_32(), "TODO: Check this (likely #GP)");
dbg_assert!(offset == 0, "TODO: Check this (likely #GP)");
do_task_switch(selector, error_code);
return;
}
let cs_segment_descriptor = match return_on_pagefault!(lookup_segment_selector(
SegmentSelector::of_u16(selector as u16)
)) {
Ok((desc, _)) => desc,
Err(SelectorNullOrInvalid::IsNull) => {
dbg_log!("is null");
panic!("Unimplemented: #GP handler");
},
Err(SelectorNullOrInvalid::OutsideOfTableLimit) => {
dbg_log!("is invalid");
panic!("Unimplemented: #GP handler (error code)");
},
};
dbg_assert!(offset as u32 <= cs_segment_descriptor.effective_limit());
if !cs_segment_descriptor.is_executable() || cs_segment_descriptor.dpl() > *cpl {
dbg_log!("not exec");
panic!("Unimplemented: #GP handler");
}
if !cs_segment_descriptor.is_present() {
// kvm-unit-test
dbg_log!("not present");
trigger_np(interrupt_nr << 3 | 2);
return;
}
let old_flags = get_eflags();
if !cs_segment_descriptor.is_dc() && cs_segment_descriptor.dpl() < *cpl {
// inter privilege level interrupt
// interrupt from vm86 mode
if old_flags & FLAG_VM != 0 && cs_segment_descriptor.dpl() != 0 {
panic!("Unimplemented: #GP handler for non-0 cs segment dpl when in vm86 mode");
}
let (new_ss, new_esp) =
return_on_pagefault!(get_tss_ss_esp(cs_segment_descriptor.dpl()));
let ss_segment_selector = SegmentSelector::of_u16(new_ss as u16);
let ss_segment_descriptor =
match return_on_pagefault!(lookup_segment_selector(ss_segment_selector)) {
Ok((desc, _)) => desc,
Err(
SelectorNullOrInvalid::IsNull | SelectorNullOrInvalid::OutsideOfTableLimit,
) => {
panic!("Unimplemented: #TS handler");
},
};
if ss_segment_descriptor.is_dc() {
dbg_assert!(new_esp as u32 > ss_segment_descriptor.effective_limit());
}
else {
dbg_assert!(new_esp as u32 - 1 <= ss_segment_descriptor.effective_limit());
}
dbg_assert!(!ss_segment_descriptor.is_system() && ss_segment_descriptor.is_writable());
if ss_segment_selector.rpl() != cs_segment_descriptor.dpl() {
panic!("Unimplemented: #TS handler");
}
if ss_segment_descriptor.dpl() != cs_segment_descriptor.dpl()
|| !ss_segment_descriptor.is_rw()
{
panic!("Unimplemented: #TS handler");
}
if !ss_segment_descriptor.is_present() {
panic!("Unimplemented: #TS handler");
}
let old_esp = read_reg32(ESP);
let old_ss = *sreg.offset(SS as isize) as i32;
let error_code_space = if error_code.is_some() { 1 } else { 0 };
let vm86_space = if (old_flags & FLAG_VM) == FLAG_VM { 4 } else { 0 };
let bytes_per_arg = if descriptor.is_32() { 4 } else { 2 };
let stack_space = bytes_per_arg * (5 + error_code_space + vm86_space);
let new_stack_pointer = ss_segment_descriptor.base()
+ if ss_segment_descriptor.is_32() {
new_esp - stack_space
}
else {
new_esp - stack_space & 0xFFFF
};
return_on_pagefault!(translate_address_system_write(new_stack_pointer));
return_on_pagefault!(translate_address_system_write(
ss_segment_descriptor.base() + new_esp - 1
));
// no exceptions below
*cpl = cs_segment_descriptor.dpl();
cpl_changed();
update_cs_size(cs_segment_descriptor.is_32());
*flags &= !FLAG_VM & !FLAG_RF;
if !switch_seg(SS, new_ss) {
// XXX
dbg_assert!(false);
}
set_stack_reg(new_esp);
// XXX: #SS if stack would cross stack limit
if old_flags & FLAG_VM != 0 {
if !descriptor.is_32() {
dbg_assert!(false);
}
else {
push32(*sreg.offset(GS as isize) as i32).unwrap();
push32(*sreg.offset(FS as isize) as i32).unwrap();
push32(*sreg.offset(DS as isize) as i32).unwrap();
push32(*sreg.offset(ES as isize) as i32).unwrap();
}
}
if descriptor.is_32() {
push32(old_ss).unwrap();
push32(old_esp).unwrap();
}
else {
push16(old_ss).unwrap();
push16(old_esp & 0xFFFF).unwrap();
}
}
else if cs_segment_descriptor.is_dc() || cs_segment_descriptor.dpl() == *cpl {
// intra privilege level interrupt
//dbg_log!("Intra privilege interrupt gate=" + h(selector, 4) + ":" + h(offset >>> 0, 8) +
// " gate_type=" + gate_type + " 16bit=" + descriptor.is_32() +
// " cpl=" + *cpl + " dpl=" + segment_descriptor.dpl() + " conforming=" + +segment_descriptor.is_dc(), );
//debug.dump_regs_short();
if *flags & FLAG_VM != 0 {
dbg_assert!(false, "check error code");
trigger_gp(selector & !3);
return;
}
let bytes_per_arg = if descriptor.is_32() { 4 } else { 2 };
let error_code_space = if error_code.is_some() { 1 } else { 0 };
let stack_space = bytes_per_arg * (3 + error_code_space);
// XXX: with current cpl or with cpl 0?
return_on_pagefault!(writable_or_pagefault(
get_stack_pointer(-stack_space),
stack_space
));
// no exceptions below
}
else {
panic!("Unimplemented: #GP handler");
}
// XXX: #SS if stack would cross stack limit
if descriptor.is_32() {
push32(old_flags).unwrap();
push32(*sreg.offset(CS as isize) as i32).unwrap();
push32(get_real_eip()).unwrap();
if let Some(ec) = error_code {
push32(ec).unwrap();
}
}
else {
push16(old_flags & 0xFFFF).unwrap();
push16(*sreg.offset(CS as isize) as i32).unwrap();
push16(get_real_eip() & 0xFFFF).unwrap();
if let Some(ec) = error_code {
dbg_assert!(ec >= 0 && ec < 0x10000);
push16(ec).unwrap();
}
offset &= 0xFFFF;
}
if old_flags & FLAG_VM != 0 {
if !switch_seg(GS, 0) || !switch_seg(FS, 0) || !switch_seg(DS, 0) || !switch_seg(ES, 0)
{
// can't fail
dbg_assert!(false);
}
}
*sreg.offset(CS as isize) = (selector as u16) & !3 | *cpl as u16;
dbg_assert!((*sreg.offset(CS as isize) & 3) == *cpl as u16);
update_cs_size(cs_segment_descriptor.is_32());
*segment_limits.offset(CS as isize) = cs_segment_descriptor.effective_limit();
*segment_offsets.offset(CS as isize) = cs_segment_descriptor.base();
*segment_access_bytes.offset(CS as isize) = cs_segment_descriptor.access_byte();
*instruction_pointer = get_seg_cs() + offset;
*flags &= !FLAG_NT & !FLAG_VM & !FLAG_RF & !FLAG_TRAP;
if gate_type == InterruptDescriptor::INTERRUPT_GATE {
// clear int flag for interrupt gates
*flags &= !FLAG_INTERRUPT;
}
else {
if *flags & FLAG_INTERRUPT != 0 && old_flags & FLAG_INTERRUPT == 0 {
handle_irqs();
}
}
update_state_flags();
}
else {
// call 4 byte cs:ip interrupt vector from ivt at cpu.memory 0
let index = (interrupt_nr << 2) as u32;
let new_ip = memory::read16(index);
let new_cs = memory::read16(index + 2);
dbg_assert!(
index | 3 <= IVT_SIZE,
"Unimplemented: #GP for interrupt number out of IVT bounds"
);
// XXX: #SS if stack would cross stack limit
// push flags, cs:ip
push16(get_eflags() & 0xFFFF).unwrap();
push16(*sreg.offset(CS as isize) as i32).unwrap();
push16(get_real_eip() & 0xFFFF).unwrap();
*flags &= !FLAG_INTERRUPT & !FLAG_AC & !FLAG_TRAP;
switch_cs_real_mode(new_cs);
*instruction_pointer = get_seg_cs() + new_ip;
update_state_flags();
}
}
pub unsafe fn far_jump(eip: i32, selector: i32, is_call: bool, is_osize_32: bool) {
dbg_assert!(selector < 0x10000 && selector >= 0);
if !*protected_mode || vm86_mode() {
if is_call {
if is_osize_32 {
return_on_pagefault!(writable_or_pagefault(get_stack_pointer(-8), 8));
push32(*sreg.offset(CS as isize) as i32).unwrap();
push32(get_real_eip()).unwrap();
}
else {
return_on_pagefault!(writable_or_pagefault(get_stack_pointer(-4), 4));
push16(*sreg.offset(CS as isize) as i32).unwrap();
push16(get_real_eip()).unwrap();
}
}
switch_cs_real_mode(selector);
*instruction_pointer = get_seg_cs() + eip;
update_state_flags();
return;
}
let cs_selector = SegmentSelector::of_u16(selector as u16);
let info = match return_on_pagefault!(lookup_segment_selector(cs_selector)) {
Ok((desc, _)) => desc,
Err(SelectorNullOrInvalid::IsNull) => {
dbg_log!("#gp null cs");
trigger_gp(0);
return;
},
Err(SelectorNullOrInvalid::OutsideOfTableLimit) => {
dbg_log!("#gp invalid cs: {:x}", selector);
trigger_gp(selector & !3);
return;
},
};
if info.is_system() {
dbg_assert!(is_call, "TODO: Jump");
dbg_log!("system type cs: {:x}", selector);
if info.system_type() == 0xC || info.system_type() == 4 {
// call gate
let is_16 = info.system_type() == 4;
if info.dpl() < *cpl || info.dpl() < cs_selector.rpl() {
dbg_log!("#gp cs gate dpl < cpl or dpl < rpl: {:x}", selector);
trigger_gp(selector & !3);
return;
}
if !info.is_present() {
dbg_log!("#NP for loading not-present in gate cs sel={:x}", selector);
trigger_np(selector & !3);
return;
}
let cs_selector = (info.raw >> 16) as i32;
let cs_info = match return_on_pagefault!(lookup_segment_selector(
SegmentSelector::of_u16(cs_selector as u16)
)) {
Ok((desc, _)) => desc,
Err(SelectorNullOrInvalid::IsNull) => {
dbg_log!("#gp null cs");
trigger_gp(0);
return;
},
Err(SelectorNullOrInvalid::OutsideOfTableLimit) => {
dbg_log!("#gp invalid cs: {:x}", cs_selector);
trigger_gp(cs_selector & !3);
return;
},
};
if cs_info.is_system() {
dbg_log!("#gp non-code cs: {:x}", cs_selector);
trigger_gp(cs_selector & !3);
return;
}
if !cs_info.is_executable() {
dbg_log!("#gp non-executable cs: {:x}", cs_selector);
trigger_gp(cs_selector & !3);
return;
}
if cs_info.dpl() > *cpl {
dbg_log!("#gp dpl > cpl: {:x}", cs_selector);
trigger_gp(cs_selector & !3);
return;
}
if !cs_info.is_present() {
dbg_log!("#NP for loading not-present in cs sel={:x}", cs_selector);
trigger_np(cs_selector & !3);
return;
}
if !cs_info.is_dc() && cs_info.dpl() < *cpl {
dbg_log!(
"more privilege call gate is_16={} from={} to={}",
is_16,
*cpl,
cs_info.dpl()
);
let (new_ss, new_esp) = return_on_pagefault!(get_tss_ss_esp(cs_info.dpl()));
let ss_selector = SegmentSelector::of_u16(new_ss as u16);
let ss_info = match return_on_pagefault!(lookup_segment_selector(ss_selector)) {
Ok((desc, _)) => desc,
Err(SelectorNullOrInvalid::IsNull) => {
panic!("null ss: {}", new_ss);
},
Err(SelectorNullOrInvalid::OutsideOfTableLimit) => {
panic!("invalid ss: {}", new_ss);
},
};
if ss_info.is_dc() {
dbg_assert!(new_esp as u32 > ss_info.effective_limit());
}
else {
dbg_assert!(new_esp as u32 - 1 <= ss_info.effective_limit());
}
dbg_assert!(!ss_info.is_system() && ss_info.is_writable());
if ss_selector.rpl() != cs_info.dpl()
// xxx: 0 in v86 mode
{
panic!("#TS handler");
}
if ss_info.dpl() != cs_info.dpl() || !ss_info.is_writable() {
panic!("#TS handler");
}
if !ss_info.is_present() {
panic!("#SS handler");
}
let parameter_count = (info.raw >> 32 & 0x1F) as i32;
let mut stack_space = if is_16 { 4 } else { 8 };
if is_call {
stack_space +=
if is_16 { 4 + 2 * parameter_count } else { 8 + 4 * parameter_count };
}
if ss_info.is_32() {
return_on_pagefault!(writable_or_pagefault_cpl(
cs_info.dpl(),
ss_info.base() + new_esp - stack_space,
stack_space
));
}
else {
return_on_pagefault!(writable_or_pagefault_cpl(
cs_info.dpl(),
ss_info.base() + (new_esp - stack_space & 0xFFFF),
stack_space
));
}
let old_esp = read_reg32(ESP);
let old_ss = *sreg.offset(SS as isize);
let old_stack_pointer = get_stack_pointer(0);
//dbg_log!("old_esp=" + h(old_esp));
*cpl = cs_info.dpl();
cpl_changed();
update_cs_size(cs_info.is_32());
dbg_assert!(new_ss & 3 == cs_info.dpl() as i32);
// XXX: Should be checked before side effects
if !switch_seg(SS, new_ss) {
dbg_assert!(false);
};
set_stack_reg(new_esp);
//dbg_log!("parameter_count=" + parameter_count);
//dbg_assert!(parameter_count == 0, "TODO");
if is_16 {
push16(old_ss as i32).unwrap();
push16(old_esp).unwrap();
}
else {
push32(old_ss as i32).unwrap();
push32(old_esp).unwrap();
}
if is_call {
if is_16 {
for i in (0..parameter_count).rev() {
let parameter = safe_read16(old_stack_pointer + 2 * i).unwrap();
push16(parameter).unwrap();
}
//writable_or_pagefault(get_stack_pointer(-4), 4);
push16(*sreg.offset(CS as isize) as i32).unwrap();
push16(get_real_eip()).unwrap();
}
else {
for i in (0..parameter_count).rev() {
let parameter = safe_read32s(old_stack_pointer + 4 * i).unwrap();
push32(parameter).unwrap();
}
//writable_or_pagefault(get_stack_pointer(-8), 8);
push32(*sreg.offset(CS as isize) as i32).unwrap();
push32(get_real_eip()).unwrap();
}
}
}
else {
dbg_log!(
"same privilege call gate is_16={} from={} to={} conforming={}",
is_16,
*cpl,
cs_info.dpl(),
cs_info.is_dc()
);
if is_call {
if is_16 {
return_on_pagefault!(writable_or_pagefault(get_stack_pointer(-4), 4));
push16(*sreg.offset(CS as isize) as i32).unwrap();
push16(get_real_eip()).unwrap();
}
else {
return_on_pagefault!(writable_or_pagefault(get_stack_pointer(-8), 8));
push32(*sreg.offset(CS as isize) as i32).unwrap();
push32(get_real_eip()).unwrap();
}
}
dbg_assert!(*cpl == cs_info.dpl());
}
// Note: eip from call is ignored
let mut new_eip = (info.raw & 0xFFFF) as i32;
if !is_16 {
new_eip |= ((info.raw >> 32) & 0xFFFF0000) as i32;
}
dbg_log!(
"call gate eip={:x} cs={:x} conforming={}",
new_eip as u32,
cs_selector,
cs_info.is_dc()
);
dbg_assert!((new_eip as u32) <= cs_info.effective_limit(), "todo: #gp");
update_cs_size(cs_info.is_32());
*segment_is_null.offset(CS as isize) = false;
*segment_limits.offset(CS as isize) = cs_info.effective_limit();
*segment_offsets.offset(CS as isize) = cs_info.base();
*segment_access_bytes.offset(CS as isize) = cs_info.access_byte();
*sreg.offset(CS as isize) = cs_selector as u16 & !3 | *cpl as u16;
dbg_assert!(*sreg.offset(CS as isize) & 3 == *cpl as u16);
*instruction_pointer = get_seg_cs() + new_eip;
update_state_flags();
}
else if info.system_type() == 1 || info.system_type() == 9 {
dbg_assert!(false, "TODO: far call task gate");
}
else {
dbg_assert!(false, "TODO: #gp invalid system type");
}
}
else {
if !info.is_executable() {
dbg_log!("#gp non-executable cs: {:x}", selector);
trigger_gp(selector & !3);
return;
}
if info.is_dc() {
// conforming code segment
if info.dpl() > *cpl {
dbg_log!("#gp cs dpl > cpl: {:x}", selector);
trigger_gp(selector & !3);
return;
}
}
else {
// non-conforming code segment
if cs_selector.rpl() > *cpl || info.dpl() != *cpl {
dbg_log!("#gp cs rpl > cpl or dpl != cpl: {:x}", selector);
trigger_gp(selector & !3);
return;
}
}
if !info.is_present() {
dbg_log!("#NP for loading not-present in cs sel={:x}", selector);
dbg_trace();
trigger_np(selector & !3);
return;
}
if is_call {
if is_osize_32 {
return_on_pagefault!(writable_or_pagefault(get_stack_pointer(-8), 8));
push32(*sreg.offset(CS as isize) as i32).unwrap();
push32(get_real_eip()).unwrap();
}
else {
return_on_pagefault!(writable_or_pagefault(get_stack_pointer(-4), 4));
push16(*sreg.offset(CS as isize) as i32).unwrap();
push16(get_real_eip()).unwrap();
}
}
dbg_assert!((eip as u32) <= info.effective_limit(), "todo: #gp");
update_cs_size(info.is_32());
*segment_is_null.offset(CS as isize) = false;
*segment_limits.offset(CS as isize) = info.effective_limit();
*segment_access_bytes.offset(CS as isize) = info.access_byte();
*segment_offsets.offset(CS as isize) = info.base();
*sreg.offset(CS as isize) = selector as u16 & !3 | *cpl as u16;
*instruction_pointer = get_seg_cs() + eip;
update_state_flags();
}
}
pub unsafe fn far_return(eip: i32, selector: i32, stack_adjust: i32, is_osize_32: bool) {
dbg_assert!(selector < 0x10000 && selector >= 0);
if !*protected_mode {
dbg_assert!(!*is_32);
}
if !*protected_mode || vm86_mode() {
switch_cs_real_mode(selector);
*instruction_pointer = get_seg_cs() + eip;
adjust_stack_reg(2 * (if is_osize_32 { 4 } else { 2 }) + stack_adjust);
update_state_flags();
return;
}
let cs_selector = SegmentSelector::of_u16(selector as u16);
let info = match return_on_pagefault!(lookup_segment_selector(cs_selector)) {
Ok((desc, _)) => desc,
Err(SelectorNullOrInvalid::IsNull) => {
dbg_log!("far return: #gp null cs");
trigger_gp(0);
return;
},
Err(SelectorNullOrInvalid::OutsideOfTableLimit) => {
dbg_log!("far return: #gp invalid cs: {:x}", selector);
trigger_gp(selector & !3);
return;
},
};
if info.is_system() {
dbg_assert!(false, "is system in far return");
trigger_gp(selector & !3);
return;
}
if !info.is_executable() {
dbg_log!("non-executable cs: {:x}", selector);
trigger_gp(selector & !3);
return;
}
if cs_selector.rpl() < *cpl {
dbg_log!("cs rpl < cpl: {:x}", selector);
trigger_gp(selector & !3);
return;
}
if info.is_dc() && info.dpl() > cs_selector.rpl() {
dbg_log!("cs conforming and dpl > rpl: {:x}", selector);
trigger_gp(selector & !3);
return;
}
if !info.is_dc() && info.dpl() != cs_selector.rpl() {
dbg_log!("cs non-conforming and dpl != rpl: {:x}", selector);
trigger_gp(selector & !3);
return;
}
if !info.is_present() {
dbg_log!("#NP for loading not-present in cs sel={:x}", selector);
dbg_trace();
trigger_np(selector & !3);
return;
}
if cs_selector.rpl() > *cpl {
dbg_log!(
"far return privilege change cs: {:x} from={} to={} is_16={}",
selector,
*cpl,
cs_selector.rpl(),
is_osize_32
);
let temp_esp;
let temp_ss;
if is_osize_32 {
//dbg_log!("esp read from " + h(translate_address_system_read(get_stack_pointer(stack_adjust + 8))))
temp_esp = safe_read32s(get_stack_pointer(stack_adjust + 8)).unwrap();
//dbg_log!("esp=" + h(temp_esp));
temp_ss = safe_read16(get_stack_pointer(stack_adjust + 12)).unwrap();
}
else {
//dbg_log!("esp read from " + h(translate_address_system_read(get_stack_pointer(stack_adjust + 4))));
temp_esp = safe_read16(get_stack_pointer(stack_adjust + 4)).unwrap();
//dbg_log!("esp=" + h(temp_esp));
temp_ss = safe_read16(get_stack_pointer(stack_adjust + 6)).unwrap();
}
*cpl = cs_selector.rpl();
cpl_changed();
// XXX: This failure should be checked before side effects
if !switch_seg(SS, temp_ss) {
dbg_assert!(false);
}
set_stack_reg(temp_esp + stack_adjust);
//if(is_osize_32)
//{
// adjust_stack_reg(2 * 4);
//}
//else
//{
// adjust_stack_reg(2 * 2);
//}
//throw debug.unimpl("privilege change");
//adjust_stack_reg(stack_adjust);
// TODO: invalidate segments that are not accessible at this cpl (see iret)
}
else {
if is_osize_32 {
adjust_stack_reg(2 * 4 + stack_adjust);
}
else {
adjust_stack_reg(2 * 2 + stack_adjust);
}
}
//dbg_assert(*cpl == info.dpl);
update_cs_size(info.is_32());
*segment_is_null.offset(CS as isize) = false;
*segment_limits.offset(CS as isize) = info.effective_limit();
*segment_access_bytes.offset(CS as isize) = info.access_byte();
*segment_offsets.offset(CS as isize) = info.base();
*sreg.offset(CS as isize) = selector as u16;
dbg_assert!(selector & 3 == *cpl as i32);
*instruction_pointer = get_seg_cs() + eip;
update_state_flags();
}
pub unsafe fn do_task_switch(selector: i32, error_code: Option<i32>) {
dbg_log!("do_task_switch sel={:x}", selector);
dbg_assert!(*tss_size_32, "TODO: 16-bit TSS in task switch");
let selector = SegmentSelector::of_u16(selector as u16);
let (descriptor, descriptor_address) =
match lookup_segment_selector(selector).expect("TODO: handle pagefault") {
Ok(desc) => desc,
Err(_) => {
panic!("#GP handler");
},
};
dbg_assert!(selector.is_gdt());
dbg_assert!((descriptor.system_type() & !2) == 1 || (descriptor.system_type() & !2) == 9);
let tss_is_16 = descriptor.system_type() <= 3;
let tss_is_busy = (descriptor.system_type() & 2) == 2;
if (descriptor.system_type() & 2) == 2 {
// is busy
panic!("#GP handler");
}
if !descriptor.is_present() {
panic!("#NP handler");
}
if descriptor.effective_limit() < 103 {
panic!("#NP handler");
}
let _tsr_size = *segment_limits.offset(TR as isize);
let tsr_offset = *segment_offsets.offset(TR as isize);
let mut old_eflags = get_eflags();
if tss_is_busy {
old_eflags &= !FLAG_NT;
}
writable_or_pagefault(tsr_offset, 0x66).unwrap();
//safe_write32(tsr_offset + TSR_CR3, *cr.offset(3));
// TODO: Write 16 bit values if old tss is 16 bit
safe_write32(tsr_offset + TSR_EIP, get_real_eip()).unwrap();
safe_write32(tsr_offset + TSR_EFLAGS, old_eflags).unwrap();
safe_write32(tsr_offset + TSR_EAX, read_reg32(EAX)).unwrap();
safe_write32(tsr_offset + TSR_ECX, read_reg32(ECX)).unwrap();
safe_write32(tsr_offset + TSR_EDX, read_reg32(EDX)).unwrap();
safe_write32(tsr_offset + TSR_EBX, read_reg32(EBX)).unwrap();
safe_write32(tsr_offset + TSR_ESP, read_reg32(ESP)).unwrap();
safe_write32(tsr_offset + TSR_EBP, read_reg32(EBP)).unwrap();
safe_write32(tsr_offset + TSR_ESI, read_reg32(ESI)).unwrap();
safe_write32(tsr_offset + TSR_EDI, read_reg32(EDI)).unwrap();
safe_write32(tsr_offset + TSR_ES, *sreg.offset(ES as isize) as i32).unwrap();
safe_write32(tsr_offset + TSR_CS, *sreg.offset(CS as isize) as i32).unwrap();
safe_write32(tsr_offset + TSR_SS, *sreg.offset(SS as isize) as i32).unwrap();
safe_write32(tsr_offset + TSR_DS, *sreg.offset(DS as isize) as i32).unwrap();
safe_write32(tsr_offset + TSR_FS, *sreg.offset(FS as isize) as i32).unwrap();
safe_write32(tsr_offset + TSR_GS, *sreg.offset(GS as isize) as i32).unwrap();
//safe_write32(tsr_offset + TSR_LDT, *sreg.offset(reg_ldtr));
if true
/* is jump or call or int */
{
safe_write64(descriptor_address, descriptor.set_busy().raw).unwrap();
}
//let new_tsr_size = descriptor.effective_limit;
let new_tsr_offset = descriptor.base();
dbg_assert!(!tss_is_16, "unimplemented");
if true
/* is call or int */
{
safe_write16(
new_tsr_offset + TSR_BACKLINK,
*sreg.offset(TR as isize) as i32,
)
.unwrap();
}
let new_cr3 = safe_read32s(new_tsr_offset + TSR_CR3).unwrap();
*flags &= !FLAG_VM;
let new_eip = safe_read32s(new_tsr_offset + TSR_EIP).unwrap();
let new_cs = safe_read16(new_tsr_offset + TSR_CS).unwrap();
let new_cs_selector = SegmentSelector::of_u16(new_cs as u16);
let new_cs_descriptor =
match lookup_segment_selector(new_cs_selector).expect("TODO: handle pagefault") {
Ok((desc, _)) => desc,
Err(SelectorNullOrInvalid::IsNull) => {
dbg_log!("null cs");
panic!("#TS handler");
},
Err(SelectorNullOrInvalid::OutsideOfTableLimit) => {
dbg_log!("invalid cs: {:x}", new_cs);
panic!("#TS handler");
},
};
if new_cs_descriptor.is_system() {
panic!("#TS handler");
}
if !new_cs_descriptor.is_executable() {
panic!("#TS handler");
}
if new_cs_descriptor.is_dc() && new_cs_descriptor.dpl() > new_cs_selector.rpl() {
dbg_log!("cs conforming and dpl > rpl: {:x}", selector.raw);
panic!("#TS handler");
}
if !new_cs_descriptor.is_dc() && new_cs_descriptor.dpl() != new_cs_selector.rpl() {
dbg_log!("cs non-conforming and dpl != rpl: {:x}", selector.raw);
panic!("#TS handler");
}
if !new_cs_descriptor.is_present() {
dbg_log!("#NP for loading not-present in cs sel={:x}", selector.raw);
panic!("#TS handler");
}
*segment_is_null.offset(CS as isize) = false;
*segment_limits.offset(CS as isize) = new_cs_descriptor.effective_limit();
*segment_offsets.offset(CS as isize) = new_cs_descriptor.base();
*segment_access_bytes.offset(CS as isize) = new_cs_descriptor.access_byte();
*sreg.offset(CS as isize) = new_cs as u16;
*cpl = new_cs_descriptor.dpl();
cpl_changed();
dbg_assert!((*sreg.offset(CS as isize) & 3) as u8 == *cpl);
dbg_assert!(
new_eip as u32 <= new_cs_descriptor.effective_limit(),
"todo: #gp"
);
update_cs_size(new_cs_descriptor.is_32());
let mut new_eflags = safe_read32s(new_tsr_offset + TSR_EFLAGS).unwrap();
if true
/* is call or int */
{
safe_write32(tsr_offset + TSR_BACKLINK, selector.raw as i32).unwrap();
new_eflags |= FLAG_NT;
}
if new_eflags & FLAG_VM != 0 {
panic!("task switch to VM mode");
}
update_eflags(new_eflags);
if true
/* call or int */
{
*flags |= FLAG_NT;
}
let new_ldt = safe_read16(new_tsr_offset + TSR_LDT).unwrap();
load_ldt(new_ldt).unwrap();
write_reg32(EAX, safe_read32s(new_tsr_offset + TSR_EAX).unwrap());
write_reg32(ECX, safe_read32s(new_tsr_offset + TSR_ECX).unwrap());
write_reg32(EDX, safe_read32s(new_tsr_offset + TSR_EDX).unwrap());
write_reg32(EBX, safe_read32s(new_tsr_offset + TSR_EBX).unwrap());
write_reg32(ESP, safe_read32s(new_tsr_offset + TSR_ESP).unwrap());
write_reg32(EBP, safe_read32s(new_tsr_offset + TSR_EBP).unwrap());
write_reg32(ESI, safe_read32s(new_tsr_offset + TSR_ESI).unwrap());
write_reg32(EDI, safe_read32s(new_tsr_offset + TSR_EDI).unwrap());
if !switch_seg(ES, safe_read16(new_tsr_offset + TSR_ES).unwrap())
|| !switch_seg(SS, safe_read16(new_tsr_offset + TSR_SS).unwrap())
|| !switch_seg(DS, safe_read16(new_tsr_offset + TSR_DS).unwrap())
|| !switch_seg(FS, safe_read16(new_tsr_offset + TSR_FS).unwrap())
|| !switch_seg(GS, safe_read16(new_tsr_offset + TSR_GS).unwrap())
{
// XXX: Should be checked before side effects
dbg_assert!(false);
}
*instruction_pointer = get_seg_cs() + new_eip;
*segment_offsets.offset(TR as isize) = descriptor.base();
*segment_limits.offset(TR as isize) = descriptor.effective_limit();
*sreg.offset(TR as isize) = selector.raw;
set_cr3(new_cr3);
*cr.offset(0) |= CR0_TS;
if let Some(error_code) = error_code {
if tss_is_16 {
push16(error_code & 0xFFFF).unwrap();
}
else {
push32(error_code).unwrap();
}
}
update_state_flags();
}
pub unsafe fn after_block_boundary() { jit_block_boundary = true; }
#[no_mangle]
pub fn track_jit_exit(phys_addr: u32) {
unsafe {
debug_last_jump = LastJump::Compiled { phys_addr };
}
}
#[no_mangle]
pub unsafe fn get_eflags() -> i32 {
return *flags & !FLAGS_ALL
| getcf() as i32
| (getpf() as i32) << 2
| (getaf() as i32) << 4
| (getzf() as i32) << 6
| (getsf() as i32) << 7
| (getof() as i32) << 11;
}
pub unsafe fn readable_or_pagefault(addr: i32, size: i32) -> OrPageFault<()> {
dbg_assert!(size < 0x1000);
dbg_assert!(size > 0);
let user = *cpl == 3;
translate_address(addr, false, user, false, true)?;
let end = addr + size - 1 & !0xFFF;
if addr & !0xFFF != end & !0xFFF {
translate_address(end, false, user, false, true)?;
}
return Ok(());
}
pub unsafe fn writable_or_pagefault(addr: i32, size: i32) -> OrPageFault<()> {
writable_or_pagefault_cpl(*cpl, addr, size)
}
pub unsafe fn writable_or_pagefault_cpl(other_cpl: u8, addr: i32, size: i32) -> OrPageFault<()> {
dbg_assert!(size < 0x1000);
dbg_assert!(size > 0);
let user = other_cpl == 3;
translate_address(addr, true, user, false, true)?;
let end = addr + size - 1 & !0xFFF;
if addr & !0xFFF != end & !0xFFF {
translate_address(end, true, user, false, true)?;
}
return Ok(());
}
pub fn translate_address_read_no_side_effects(address: i32) -> OrPageFault<u32> {
unsafe { translate_address(address, false, *cpl == 3, false, false) }
}
pub fn translate_address_read(address: i32) -> OrPageFault<u32> {
unsafe { translate_address(address, false, *cpl == 3, false, true) }
}
pub unsafe fn translate_address_read_jit(address: i32) -> OrPageFault<u32> {
translate_address(address, false, *cpl == 3, true, true)
}
pub unsafe fn translate_address_write(address: i32) -> OrPageFault<u32> {
translate_address(address, true, *cpl == 3, false, true)
}
pub unsafe fn translate_address_write_jit_and_can_skip_dirty(
address: i32,
) -> OrPageFault<(u32, bool)> {
let mut entry = tlb_data[(address as u32 >> 12) as usize];
let user = *cpl == 3;
if entry & (TLB_VALID | if user { TLB_NO_USER } else { 0 } | TLB_READONLY) != TLB_VALID {
entry = do_page_walk(address, true, user, true, true)?.get();
}
Ok((
(entry & !0xFFF ^ address) as u32 - memory::mem8 as u32,
entry & TLB_HAS_CODE == 0,
))
}
pub unsafe fn translate_address_system_read(address: i32) -> OrPageFault<u32> {
translate_address(address, false, false, false, true)
}
pub unsafe fn translate_address_system_write(address: i32) -> OrPageFault<u32> {
translate_address(address, true, false, false, true)
}
#[inline(always)]
pub unsafe fn translate_address(
address: i32,
for_writing: bool,
user: bool,
jit: bool,
side_effects: bool,
) -> OrPageFault<u32> {
let mut entry = tlb_data[(address as u32 >> 12) as usize];
if entry
& (TLB_VALID
| if user { TLB_NO_USER } else { 0 }
| if for_writing { TLB_READONLY } else { 0 })
!= TLB_VALID
{
entry = do_page_walk(address, for_writing, user, jit, side_effects)?.get();
}
Ok((entry & !0xFFF ^ address) as u32 - memory::mem8 as u32)
}
pub unsafe fn translate_address_write_and_can_skip_dirty(address: i32) -> OrPageFault<(u32, bool)> {
let mut entry = tlb_data[(address as u32 >> 12) as usize];
let user = *cpl == 3;
if entry & (TLB_VALID | if user { TLB_NO_USER } else { 0 } | TLB_READONLY) != TLB_VALID {
entry = do_page_walk(address, true, user, false, true)?.get();
}
Ok((
(entry & !0xFFF ^ address) as u32 - memory::mem8 as u32,
entry & TLB_HAS_CODE == 0,
))
}
// 32-bit paging:
// - 10 bits PD | 10 bits PT | 12 bits offset
// - 10 bits PD | 22 bits offset (4MB huge page)
//
// PAE paging:
// - 2 bits PDPT | 9 bits PD | 9 bits PT | 12 bits offset
// - 2 bits PDPT | 9 bits PD | 21 bits offset (2MB huge page)
//
// Note that PAE entries are 64-bit, and can describe physical addresses over 32
// bits. However, since we support only 32-bit physical addresses, we require
// the high half of the entry to be 0.
#[cold]
pub unsafe fn do_page_walk(
addr: i32,
for_writing: bool,
user: bool,
jit: bool,
side_effects: bool,
) -> OrPageFault<std::num::NonZeroI32> {
let global;
let mut allow_user = true;
let page = (addr as u32 >> 12) as i32;
let high;
let cr0 = *cr;
let cr4 = *cr.offset(4);
if cr0 & CR0_PG == 0 {
// paging disabled
high = addr as u32 & 0xFFFFF000;
global = false
}
else {
profiler::stat_increment(stat::TLB_MISS);
let pae = cr4 & CR4_PAE != 0;
let (page_dir_addr, page_dir_entry) = if pae {
let pdpt_entry = *reg_pdpte.offset(((addr as u32) >> 30) as isize);
if pdpt_entry as i32 & PAGE_TABLE_PRESENT_MASK == 0 {
if side_effects {
trigger_pagefault(addr, false, for_writing, user, jit);
}
return Err(());
}
let page_dir_addr =
(pdpt_entry as u32 & 0xFFFFF000) + ((((addr as u32) >> 21) & 0x1FF) << 3);
let page_dir_entry = memory::read64s(page_dir_addr);
dbg_assert!(
page_dir_entry as u64 & 0x7FFF_FFFF_0000_0000 == 0,
"Unsupported: Page directory entry larger than 32 bits"
);
dbg_assert!(
page_dir_entry & 0x8000_0000_0000_0000u64 as i64 == 0,
"Unsupported: NX bit"
);
(page_dir_addr, page_dir_entry as i32)
}
else {
let page_dir_addr = *cr.offset(3) as u32 + (((addr as u32) >> 22) << 2);
let page_dir_entry = memory::read32s(page_dir_addr);
(page_dir_addr, page_dir_entry)
};
if page_dir_entry & PAGE_TABLE_PRESENT_MASK == 0 {
if side_effects {
trigger_pagefault(addr, false, for_writing, user, jit);
}
return Err(());
}
let kernel_write_override = !user && 0 == cr0 & CR0_WP;
let mut allow_write = page_dir_entry & PAGE_TABLE_RW_MASK != 0;
allow_user &= page_dir_entry & PAGE_TABLE_USER_MASK != 0;
if 0 != page_dir_entry & PAGE_TABLE_PSE_MASK && 0 != cr4 & CR4_PSE {
// size bit is set
if for_writing && !allow_write && !kernel_write_override || user && !allow_user {
if side_effects {
trigger_pagefault(addr, true, for_writing, user, jit);
}
return Err(());
}
// set the accessed and dirty bits
let new_page_dir_entry = page_dir_entry
| PAGE_TABLE_ACCESSED_MASK
| if for_writing { PAGE_TABLE_DIRTY_MASK } else { 0 };
if side_effects && page_dir_entry != new_page_dir_entry {
memory::write8(page_dir_addr, new_page_dir_entry);
}
high = if pae {
page_dir_entry as u32 & 0xFFE00000 | (addr & 0x1FF000) as u32
}
else {
page_dir_entry as u32 & 0xFFC00000 | (addr & 0x3FF000) as u32
};
global = page_dir_entry & PAGE_TABLE_GLOBAL_MASK == PAGE_TABLE_GLOBAL_MASK
}
else {
let (page_table_addr, page_table_entry) = if pae {
let page_table_addr =
(page_dir_entry as u32 & 0xFFFFF000) + (((addr as u32 >> 12) & 0x1FF) << 3);
let page_table_entry = memory::read64s(page_table_addr);
dbg_assert!(
page_table_entry as u64 & 0x7FFF_FFFF_0000_0000 == 0,
"Unsupported: Page table entry larger than 32 bits"
);
dbg_assert!(
page_table_entry & 0x8000_0000_0000_0000u64 as i64 == 0,
"Unsupported: NX bit"
);
(page_table_addr, page_table_entry as i32)
}
else {
let page_table_addr =
(page_dir_entry as u32 & 0xFFFFF000) + (((addr as u32 >> 12) & 0x3FF) << 2);
let page_table_entry = memory::read32s(page_table_addr);
(page_table_addr, page_table_entry)
};
let present = page_table_entry & PAGE_TABLE_PRESENT_MASK != 0;
allow_write &= page_table_entry & PAGE_TABLE_RW_MASK != 0;
allow_user &= page_table_entry & PAGE_TABLE_USER_MASK != 0;
if !present
|| for_writing && !allow_write && !kernel_write_override
|| user && !allow_user
{
if side_effects {
trigger_pagefault(addr, present, for_writing, user, jit);
}
return Err(());
}
// Set the accessed and dirty bits
// Note: dirty bit is only set on the page table entry
let new_page_dir_entry = page_dir_entry | PAGE_TABLE_ACCESSED_MASK;
if side_effects && new_page_dir_entry != page_dir_entry {
memory::write8(page_dir_addr, new_page_dir_entry);
}
let new_page_table_entry = page_table_entry
| PAGE_TABLE_ACCESSED_MASK
| if for_writing { PAGE_TABLE_DIRTY_MASK } else { 0 };
if side_effects && page_table_entry != new_page_table_entry {
memory::write8(page_table_addr, new_page_table_entry);
}
high = page_table_entry as u32 & 0xFFFFF000;
global = page_table_entry & PAGE_TABLE_GLOBAL_MASK == PAGE_TABLE_GLOBAL_MASK
}
}
if side_effects && tlb_data[page as usize] == 0 {
if valid_tlb_entries_count == VALID_TLB_ENTRY_MAX {
profiler::stat_increment(stat::TLB_FULL);
clear_tlb();
// also clear global entries if tlb is almost full after clearing non-global pages
if valid_tlb_entries_count > VALID_TLB_ENTRY_MAX * 3 / 4 {
profiler::stat_increment(stat::TLB_GLOBAL_FULL);
full_clear_tlb();
}
}
dbg_assert!(valid_tlb_entries_count < VALID_TLB_ENTRY_MAX);
valid_tlb_entries[valid_tlb_entries_count as usize] = page;
valid_tlb_entries_count += 1;
// TODO: Check that there are no duplicates in valid_tlb_entries
// XXX: There will probably be duplicates due to invlpg deleting
// entries from tlb_data but not from valid_tlb_entries
}
else if side_effects && CHECK_TLB_INVARIANTS {
let mut found = false;
for i in 0..valid_tlb_entries_count {
if valid_tlb_entries[i as usize] == page {
found = true;
break;
}
}
dbg_assert!(found);
}
let is_in_mapped_range = memory::in_mapped_range(high);
let has_code = if side_effects {
!is_in_mapped_range && jit::jit_page_has_code(Page::page_of(high))
}
else {
// If side_effects is false, don't call into jit::jit_page_has_code. This value is not used
// anyway (we only get here by translate_address_read_no_side_effects, which only uses the
// address part)
true
};
let info_bits = TLB_VALID
| if for_writing { 0 } else { TLB_READONLY }
| if allow_user { 0 } else { TLB_NO_USER }
| if is_in_mapped_range { TLB_IN_MAPPED_RANGE } else { 0 }
| if global && 0 != cr4 & CR4_PGE { TLB_GLOBAL } else { 0 }
| if has_code { TLB_HAS_CODE } else { 0 };
let tlb_entry = (high + memory::mem8 as u32) as i32 ^ page << 12 | info_bits as i32;
dbg_assert!((high ^ (page as u32) << 12) & 0xFFF == 0);
if side_effects {
// bake in the addition with memory::mem8 to save an instruction from the fast path
// of memory accesses
tlb_data[page as usize] = tlb_entry;
jit::update_tlb_code(Page::page_of(addr as u32), Page::page_of(high));
}
Ok(if DEBUG {
std::num::NonZeroI32::new(tlb_entry).unwrap()
}
else {
std::num::NonZeroI32::new_unchecked(tlb_entry)
})
}
#[no_mangle]
pub unsafe fn full_clear_tlb() {
profiler::stat_increment(stat::FULL_CLEAR_TLB);
// clear tlb including global pages
*last_virt_eip = -1;
for i in 0..valid_tlb_entries_count {
let page = valid_tlb_entries[i as usize];
clear_tlb_code(page);
tlb_data[page as usize] = 0;
}
valid_tlb_entries_count = 0;
if CHECK_TLB_INVARIANTS {
#[allow(static_mut_refs)]
for &entry in tlb_data.iter() {
dbg_assert!(entry == 0);
}
};
}
#[no_mangle]
pub unsafe fn clear_tlb() {
profiler::stat_increment(stat::CLEAR_TLB);
// clear tlb excluding global pages
*last_virt_eip = -1;
let mut global_page_offset = 0;
for i in 0..valid_tlb_entries_count {
let page = valid_tlb_entries[i as usize];
let entry = tlb_data[page as usize];
if 0 != entry & TLB_GLOBAL {
// reinsert at the front
valid_tlb_entries[global_page_offset as usize] = page;
global_page_offset += 1;
}
else {
clear_tlb_code(page);
tlb_data[page as usize] = 0;
}
}
valid_tlb_entries_count = global_page_offset;
if CHECK_TLB_INVARIANTS {
#[allow(static_mut_refs)]
for &entry in tlb_data.iter() {
dbg_assert!(entry == 0 || 0 != entry & TLB_GLOBAL);
}
};
}
#[no_mangle]
pub unsafe fn trigger_de_jit(eip_offset_in_page: i32) {
dbg_log!("#de in jit mode");
dbg_assert!(eip_offset_in_page >= 0 && eip_offset_in_page < 0x1000);
*instruction_pointer = *instruction_pointer & !0xFFF | eip_offset_in_page;
jit_fault = Some((CPU_EXCEPTION_DE, None))
}
#[no_mangle]
pub unsafe fn trigger_ud_jit(eip_offset_in_page: i32) {
dbg_log!("#ud in jit mode");
dbg_assert!(eip_offset_in_page >= 0 && eip_offset_in_page < 0x1000);
*instruction_pointer = *instruction_pointer & !0xFFF | eip_offset_in_page;
jit_fault = Some((CPU_EXCEPTION_UD, None))
}
#[no_mangle]
pub unsafe fn trigger_nm_jit(eip_offset_in_page: i32) {
dbg_log!("#nm in jit mode");
dbg_assert!(eip_offset_in_page >= 0 && eip_offset_in_page < 0x1000);
*instruction_pointer = *instruction_pointer & !0xFFF | eip_offset_in_page;
jit_fault = Some((CPU_EXCEPTION_NM, None))
}
#[no_mangle]
pub unsafe fn trigger_gp_jit(code: i32, eip_offset_in_page: i32) {
dbg_log!("#gp in jit mode");
dbg_assert!(eip_offset_in_page >= 0 && eip_offset_in_page < 0x1000);
*instruction_pointer = *instruction_pointer & !0xFFF | eip_offset_in_page;
jit_fault = Some((CPU_EXCEPTION_GP, Some(code)))
}
#[no_mangle]
pub unsafe fn trigger_fault_end_jit() {
#[allow(static_mut_refs)]
let (code, error_code) = jit_fault.take().unwrap();
if DEBUG {
if js::cpu_exception_hook(code) {
return;
}
}
call_interrupt_vector(code, false, error_code);
}
/// Pagefault handling with the jit works as follows:
/// - If the slow path is taken, it calls safe_{read,write}*_jit
/// - safe_{read,write}*_jit call translate_address_{read,write}_jit
/// - translate_address_{read,write}_jit do the normal page walk and call this method with
/// jit=true when a page fault happens
/// - this method prepares a page fault by setting cr2, and writes the error code
/// into jit_fault. This method *doesn't* trigger the interrupt, as registers are
/// still stored in the wasm module
/// - back in the wasm module, the generated code detects the page fault, restores the registers
/// and finally calls trigger_fault_end_jit, which does the interrupt
///
/// Non-jit resets the instruction pointer and does the PF interrupt directly
pub unsafe fn trigger_pagefault(addr: i32, present: bool, write: bool, user: bool, jit: bool) {
if config::LOG_PAGE_FAULTS {
dbg_log!(
"page fault{} w={} u={} p={} eip={:x} cr2={:x}",
if jit { "jit" } else { "" },
write as i32,
user as i32,
present as i32,
*previous_ip,
addr
);
dbg_trace();
}
profiler::stat_increment(stat::PAGE_FAULT);
*cr.offset(2) = addr;
// invalidate tlb entry
let page = ((addr as u32) >> 12) as i32;
clear_tlb_code(page);
tlb_data[page as usize] = 0;
let error_code = (user as i32) << 2 | (write as i32) << 1 | present as i32;
if jit {
jit_fault = Some((CPU_EXCEPTION_PF, Some(error_code)));
}
else {
*instruction_pointer = *previous_ip;
call_interrupt_vector(CPU_EXCEPTION_PF, false, Some(error_code));
}
}
pub fn tlb_set_has_code(physical_page: Page, has_code: bool) {
for i in 0..unsafe { valid_tlb_entries_count } {
let page = unsafe { valid_tlb_entries[i as usize] };
let entry = unsafe { tlb_data[page as usize] };
if 0 != entry {
let tlb_physical_page = Page::of_u32(
(entry as u32 >> 12 ^ page as u32) - (unsafe { memory::mem8 } as u32 >> 12),
);
if physical_page == tlb_physical_page {
unsafe {
tlb_data[page as usize] =
if has_code { entry | TLB_HAS_CODE } else { entry & !TLB_HAS_CODE }
}
if !has_code {
clear_tlb_code(page);
}
}
}
}
check_tlb_invariants();
}
pub fn tlb_set_has_code_multiple(physical_pages: &HashSet<Page>, has_code: bool) {
let physical_pages: Vec<Page> = physical_pages.into_iter().copied().collect();
for i in 0..unsafe { valid_tlb_entries_count } {
let page = unsafe { valid_tlb_entries[i as usize] };
let entry = unsafe { tlb_data[page as usize] };
if 0 != entry {
let tlb_physical_page = Page::of_u32(
(entry as u32 >> 12 ^ page as u32) - (unsafe { memory::mem8 } as u32 >> 12),
);
if physical_pages.contains(&tlb_physical_page) {
unsafe {
tlb_data[page as usize] =
if has_code { entry | TLB_HAS_CODE } else { entry & !TLB_HAS_CODE }
}
}
}
}
check_tlb_invariants();
}
pub fn check_tlb_invariants() {
if !CHECK_TLB_INVARIANTS {
return;
}
for i in 0..unsafe { valid_tlb_entries_count } {
let page = unsafe { valid_tlb_entries[i as usize] };
let entry = unsafe { tlb_data[page as usize] };
if 0 == entry || 0 != entry & TLB_IN_MAPPED_RANGE {
// there's no code in mapped memory
continue;
}
let target = (entry ^ page << 12) as u32 - unsafe { memory::mem8 } as u32;
dbg_assert!(!memory::in_mapped_range(target));
let entry_has_code = entry & TLB_HAS_CODE != 0;
let has_code = jit::jit_page_has_code(Page::page_of(target));
// If some code has been created in a page, the corresponding tlb entries must be marked
dbg_assert!(!has_code || entry_has_code);
}
}
pub const DISABLE_EIP_TRANSLATION_OPTIMISATION: bool = false;
pub unsafe fn read_imm8() -> OrPageFault<i32> {
let eip = *instruction_pointer;
if DISABLE_EIP_TRANSLATION_OPTIMISATION || 0 != eip & !0xFFF ^ *last_virt_eip {
*eip_phys = (translate_address_read(eip)? ^ eip as u32) as i32;
*last_virt_eip = eip & !0xFFF
}
dbg_assert!(!memory::in_mapped_range((*eip_phys ^ eip) as u32));
let data8 = *memory::mem8.offset((*eip_phys ^ eip) as isize) as i32;
*instruction_pointer = eip + 1;
return Ok(data8);
}
pub unsafe fn read_imm8s() -> OrPageFault<i32> { return Ok(read_imm8()? << 24 >> 24); }
pub unsafe fn read_imm16() -> OrPageFault<i32> {
// 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 DISABLE_EIP_TRANSLATION_OPTIMISATION
|| (*instruction_pointer ^ *last_virt_eip) as u32 > 0xFFE
{
return Ok(read_imm8()? | read_imm8()? << 8);
}
else {
let data16 = memory::read16((*eip_phys ^ *instruction_pointer) as u32);
*instruction_pointer = *instruction_pointer + 2;
return Ok(data16);
};
}
pub unsafe fn read_imm32s() -> OrPageFault<i32> {
// Analogue to the above comment
if DISABLE_EIP_TRANSLATION_OPTIMISATION
|| (*instruction_pointer ^ *last_virt_eip) as u32 > 0xFFC
{
return Ok(read_imm16()? | read_imm16()? << 16);
}
else {
let data32 = memory::read32s((*eip_phys ^ *instruction_pointer) as u32);
*instruction_pointer = *instruction_pointer + 4;
return Ok(data32);
};
}
pub unsafe fn is_osize_32() -> bool {
dbg_assert!(!in_jit);
return *is_32 != (*prefixes & prefix::PREFIX_MASK_OPSIZE == prefix::PREFIX_MASK_OPSIZE);
}
pub unsafe fn is_asize_32() -> bool {
dbg_assert!(!in_jit);
return *is_32 != (*prefixes & prefix::PREFIX_MASK_ADDRSIZE == prefix::PREFIX_MASK_ADDRSIZE);
}
pub unsafe fn lookup_segment_selector(
selector: SegmentSelector,
) -> OrPageFault<Result<(SegmentDescriptor, i32), SelectorNullOrInvalid>> {
if selector.is_null() {
return Ok(Err(SelectorNullOrInvalid::IsNull));
}
let (table_offset, table_limit) = if selector.is_gdt() {
(*gdtr_offset as u32, *gdtr_size as u32)
}
else {
(
*segment_offsets.offset(LDTR as isize) as u32,
*segment_limits.offset(LDTR as isize) as u32,
)
};
if selector.descriptor_offset() as u32 > table_limit {
dbg_log!(
"segment outside of table limit: selector={:x} offset={:x} isgdt={} table_limit={:x}",
selector.raw,
selector.descriptor_offset(),
selector.is_gdt(),
table_limit
);
return Ok(Err(SelectorNullOrInvalid::OutsideOfTableLimit));
}
let descriptor_address = selector.descriptor_offset() as i32 + table_offset as i32;
let descriptor = SegmentDescriptor::of_u64(memory::read64s(translate_address_system_read(
descriptor_address,
)?) as u64);
Ok(Ok((descriptor, descriptor_address)))
}
#[inline(never)]
pub unsafe fn switch_seg(reg: i32, selector_raw: i32) -> bool {
dbg_assert!(reg >= 0 && reg <= 5);
dbg_assert!(reg != CS);
dbg_assert!(selector_raw >= 0 && selector_raw < 0x10000);
if vm86_mode() {
// TODO: Should set segment_limits and segment_access_bytes if ever implemented in get_seg
// (only vm86, not in real mode)
}
if !*protected_mode || vm86_mode() {
*sreg.offset(reg as isize) = selector_raw as u16;
*segment_is_null.offset(reg as isize) = false;
*segment_offsets.offset(reg as isize) = selector_raw << 4;
if reg == SS {
*stack_size_32 = false;
}
update_state_flags();
return true;
}
let selector = SegmentSelector::of_u16(selector_raw as u16);
let (mut descriptor, descriptor_address) =
match return_on_pagefault!(lookup_segment_selector(selector), false) {
Ok(desc) => desc,
Err(SelectorNullOrInvalid::IsNull) => {
if reg == SS {
dbg_log!("#GP for loading 0 in SS sel={:x}", selector_raw);
trigger_gp(0);
return false;
}
else {
// es, ds, fs, gs
*sreg.offset(reg as isize) = selector_raw as u16;
*segment_is_null.offset(reg as isize) = true;
update_state_flags();
return true;
}
},
Err(SelectorNullOrInvalid::OutsideOfTableLimit) => {
dbg_log!(
"#GP for loading invalid in seg={} sel={:x}",
reg,
selector_raw,
);
dbg_trace();
trigger_gp(selector_raw & !3);
return false;
},
};
if reg == SS {
if descriptor.is_system()
|| selector.rpl() != *cpl
|| !descriptor.is_writable()
|| descriptor.dpl() != *cpl
{
dbg_log!("#GP for loading invalid in SS sel={:x}", selector_raw);
trigger_gp(selector_raw & !3);
return false;
}
if !descriptor.is_present() {
dbg_log!("#SS for loading non-present in SS sel={:x}", selector_raw);
trigger_ss(selector_raw & !3);
return false;
}
*stack_size_32 = descriptor.is_32();
}
else {
if descriptor.is_system()
|| !descriptor.is_readable()
|| (!descriptor.is_conforming_executable()
&& (selector.rpl() > descriptor.dpl() || *cpl > descriptor.dpl()))
{
dbg_log!(
"#GP for loading invalid in seg {} sel={:x} sys={} readable={} dc={} exec={} rpl={} dpl={} cpl={} present={} paging={}",
reg,
selector_raw,
descriptor.is_system(),
descriptor.is_readable(),
descriptor.is_dc(),
descriptor.is_executable(),
selector.rpl(),
descriptor.dpl(),
*cpl,
descriptor.is_present(),
*cr & CR0_PG != 0,
);
dbg_trace();
trigger_gp(selector_raw & !3);
return false;
}
if !descriptor.is_present() {
dbg_log!(
"#NP for loading not-present in seg {} sel={:x}",
reg,
selector_raw,
);
trigger_np(selector_raw & !3);
return false;
}
}
if !descriptor.accessed() {
descriptor = descriptor.set_accessed();
memory::write8(
translate_address_system_write(descriptor_address + 5).unwrap(),
descriptor.access_byte() as i32,
);
}
*segment_is_null.offset(reg as isize) = false;
*segment_limits.offset(reg as isize) = descriptor.effective_limit();
*segment_offsets.offset(reg as isize) = descriptor.base();
*segment_access_bytes.offset(reg as isize) = descriptor.access_byte();
*sreg.offset(reg as isize) = selector_raw as u16;
update_state_flags();
true
}
pub unsafe fn load_tr(selector: i32) {
let selector = SegmentSelector::of_u16(selector as u16);
dbg_assert!(selector.is_gdt(), "TODO: TR can only be loaded from GDT");
let (descriptor, descriptor_address) =
match return_on_pagefault!(lookup_segment_selector(selector)) {
Ok((desc, addr)) => (desc, addr),
Err(SelectorNullOrInvalid::IsNull) => {
panic!("TODO: null TR");
},
Err(SelectorNullOrInvalid::OutsideOfTableLimit) => {
panic!("TODO: TR selector outside of table limit");
},
};
//dbg_log!(
// "load tr: {:x} offset={:x} limit={:x} is32={}",
// selector.raw,
// descriptor.base(),
// descriptor.effective_limit(),
// descriptor.system_type() == 9,
//);
if !descriptor.is_system() {
panic!("#GP | ltr: not a system entry (happens when running kvm-unit-test without ACPI)");
}
if descriptor.system_type() != 9 && descriptor.system_type() != 1 {
// 0xB: busy 386 TSS (GP)
// 0x9: 386 TSS
// 0x3: busy 286 TSS (GP)
// 0x1: 286 TSS (??)
panic!(
"#GP | ltr: invalid type (type = 0x{:x})",
descriptor.system_type()
);
}
if !descriptor.is_present() {
panic!("#NT | present bit not set (ltr)");
}
*tss_size_32 = descriptor.system_type() == 9;
*segment_limits.offset(TR as isize) = descriptor.effective_limit();
*segment_offsets.offset(TR as isize) = descriptor.base();
*sreg.offset(TR as isize) = selector.raw;
// Mark task as busy
memory::write8(
translate_address_system_write(descriptor_address + 5).unwrap(),
descriptor.set_busy().access_byte() as i32,
);
}
pub unsafe fn load_ldt(selector: i32) -> OrPageFault<()> {
let selector = SegmentSelector::of_u16(selector as u16);
if selector.is_null() {
dbg_log!("lldt: null loaded");
*segment_limits.offset(LDTR as isize) = 0;
*segment_offsets.offset(LDTR as isize) = 0;
*sreg.offset(LDTR as isize) = selector.raw;
return Ok(());
}
dbg_assert!(selector.is_gdt(), "TODO: LDT can only be loaded from GDT");
let (descriptor, _) = match lookup_segment_selector(selector)? {
Ok((desc, addr)) => (desc, addr),
Err(SelectorNullOrInvalid::IsNull) => {
panic!("TODO: null TR");
},
Err(SelectorNullOrInvalid::OutsideOfTableLimit) => {
panic!("TODO: TR selector outside of table limit");
},
};
if !descriptor.is_present() {
panic!("#NT | present bit not set (lldt)");
}
if !descriptor.is_system() {
panic!("#GP | lldt: not a system entry");
}
if descriptor.system_type() != 2 {
panic!(
"#GP | lldt: invalid type (type = 0x{:x})",
descriptor.system_type()
);
}
dbg_log!(
"lldt: {:x} offset={:x} limit={:x}",
selector.raw,
descriptor.base(),
descriptor.effective_limit()
);
*segment_limits.offset(LDTR as isize) = descriptor.effective_limit();
*segment_offsets.offset(LDTR as isize) = descriptor.base();
*sreg.offset(LDTR as isize) = selector.raw;
Ok(())
}
#[no_mangle]
#[cfg(feature = "profiler")]
pub unsafe fn log_segment_null(segment: i32) {
dbg_assert!(segment >= 0 && segment < 8);
if *segment_is_null.offset(segment as isize) {
dbg_assert!(segment != CS && segment != SS);
dbg_log!("#gp: Access null segment in jit");
}
}
pub unsafe fn get_seg(segment: i32) -> OrPageFault<i32> {
dbg_assert!(segment >= 0 && segment < 8);
if *segment_is_null.offset(segment as isize) {
dbg_assert!(segment != CS && segment != SS);
dbg_log!("#gp: Access null segment {}", segment);
dbg_trace();
dbg_assert!(!in_jit);
trigger_gp(0);
return Err(());
}
return Ok(*segment_offsets.offset(segment as isize));
}
pub unsafe fn set_cr0(cr0: i32) {
let old_cr0 = *cr;
if old_cr0 & CR0_AM == 0 && cr0 & CR0_AM != 0 {
dbg_log!("Warning: Unimplemented: cr0 alignment mask");
}
if (cr0 & (CR0_PE | CR0_PG)) == CR0_PG {
panic!("cannot load PG without PE");
}
*cr = cr0;
*cr |= CR0_ET;
if old_cr0 & (CR0_PG | CR0_WP) != cr0 & (CR0_PG | CR0_WP) {
full_clear_tlb();
}
if *cr.offset(4) & CR4_PAE != 0
&& old_cr0 & (CR0_CD | CR0_NW | CR0_PG) != cr0 & (CR0_CD | CR0_NW | CR0_PG)
{
load_pdpte(*cr.offset(3))
}
*protected_mode = (*cr & CR0_PE) == CR0_PE;
*segment_access_bytes.offset(CS as isize) = 0x80 | 0x10 | 0x08 | 0x02; // P dpl0 S E RW
}
pub unsafe fn set_cr3(mut cr3: i32) {
if false {
dbg_log!("cr3 <- {:x}", cr3);
}
if *cr.offset(4) & CR4_PAE != 0 {
cr3 &= !0b1111;
load_pdpte(cr3);
}
else {
cr3 &= !0b111111100111;
dbg_assert!(cr3 & 0xFFF == 0, "TODO");
}
*cr.offset(3) = cr3;
clear_tlb();
}
pub unsafe fn load_pdpte(cr3: i32) {
dbg_assert!(cr3 & 0b1111 == 0);
for i in 0..4 {
let mut pdpt_entry = memory::read64s(cr3 as u32 + 8 * i as u32) as u64;
pdpt_entry &= !0b1110_0000_0000;
dbg_assert!(pdpt_entry & 0b11000 == 0, "TODO");
dbg_assert!(
pdpt_entry as u64 & 0xFFFF_FFFF_0000_0000 == 0,
"Unsupported: PDPT entry larger than 32 bits"
);
if pdpt_entry as i32 & PAGE_TABLE_PRESENT_MASK != 0 {
dbg_assert!(
pdpt_entry & 0b1_1110_0110 == 0,
"TODO: #gp reserved bit in pdpte"
);
}
*reg_pdpte.offset(i) = pdpt_entry;
}
}
pub unsafe fn cpl_changed() { *last_virt_eip = -1 }
pub unsafe fn update_cs_size(new_size: bool) {
if *is_32 != new_size {
*is_32 = new_size;
}
}
#[inline(never)]
pub unsafe fn test_privileges_for_io(port: i32, size: i32) -> bool {
if *protected_mode && (*cpl > getiopl() as u8 || (*flags & FLAG_VM != 0)) {
if !*tss_size_32 {
dbg_log!("#GP for port io, 16-bit TSS port={:x} size={}", port, size);
trigger_gp(0);
return false;
}
let tsr_size = *segment_limits.offset(TR as isize);
let tsr_offset = *segment_offsets.offset(TR as isize);
if tsr_size >= 0x67 {
dbg_assert!(tsr_offset + 0x64 + 2 & 0xFFF < 0xFFF);
let iomap_base = memory::read16(return_on_pagefault!(
translate_address_system_read(tsr_offset + 0x64 + 2),
false
));
let high_port = port + size - 1;
if tsr_size >= (iomap_base + (high_port >> 3)) as u32 {
let mask = ((1 << size) - 1) << (port & 7);
let addr = return_on_pagefault!(
translate_address_system_read(tsr_offset + iomap_base + (port >> 3)),
false
);
let port_info =
if mask & 0xFF00 != 0 { memory::read16(addr) } else { memory::read8(addr) };
dbg_assert!(addr & 0xFFF < 0xFFF);
if port_info & mask == 0 {
return true;
}
}
}
dbg_log!("#GP for port io port={:x} size={}", port, size);
trigger_gp(0);
return false;
}
return true;
}
pub unsafe fn popa16() {
return_on_pagefault!(readable_or_pagefault(get_stack_pointer(0), 16));
write_reg16(DI, pop16().unwrap());
write_reg16(SI, pop16().unwrap());
write_reg16(BP, pop16().unwrap());
adjust_stack_reg(2);
write_reg16(BX, pop16().unwrap());
write_reg16(DX, pop16().unwrap());
write_reg16(CX, pop16().unwrap());
write_reg16(AX, pop16().unwrap());
}
pub unsafe fn popa32() {
return_on_pagefault!(readable_or_pagefault(get_stack_pointer(0), 32));
write_reg32(EDI, pop32s().unwrap());
write_reg32(ESI, pop32s().unwrap());
write_reg32(EBP, pop32s().unwrap());
adjust_stack_reg(4);
write_reg32(EBX, pop32s().unwrap());
write_reg32(EDX, pop32s().unwrap());
write_reg32(ECX, pop32s().unwrap());
write_reg32(EAX, pop32s().unwrap());
}
pub fn get_state_flags() -> CachedStateFlags { unsafe { *state_flags } }
#[no_mangle]
pub fn get_seg_cs() -> i32 { unsafe { *segment_offsets.offset(CS as isize) } }
pub unsafe fn get_seg_ss() -> i32 { return *segment_offsets.offset(SS as isize); }
pub unsafe fn segment_prefix(default_segment: i32) -> i32 {
let prefix = *prefixes & prefix::PREFIX_MASK_SEGMENT;
if 0 != prefix {
dbg_assert!(prefix != prefix::SEG_PREFIX_ZERO);
prefix as i32 - 1
}
else {
default_segment
}
}
pub unsafe fn get_seg_prefix(default_segment: i32) -> OrPageFault<i32> {
dbg_assert!(!in_jit);
let prefix = *prefixes & prefix::PREFIX_MASK_SEGMENT;
if 0 != prefix {
if prefix == prefix::SEG_PREFIX_ZERO {
return Ok(0);
}
else {
return get_seg(prefix as i32 - 1);
}
}
else {
return get_seg(default_segment);
};
}
pub unsafe fn get_seg_prefix_ds(offset: i32) -> OrPageFault<i32> {
Ok(get_seg_prefix(DS)? + offset)
}
pub unsafe fn get_seg_prefix_ss(offset: i32) -> OrPageFault<i32> {
Ok(get_seg_prefix(SS)? + offset)
}
pub unsafe fn modrm_resolve(modrm_byte: i32) -> OrPageFault<i32> {
if is_asize_32() {
resolve_modrm32(modrm_byte)
}
else {
resolve_modrm16(modrm_byte)
}
}
pub unsafe fn run_instruction(opcode: i32) { gen::interpreter::run(opcode as u32) }
pub unsafe fn run_instruction0f_16(opcode: i32) { gen::interpreter0f::run(opcode as u32) }
pub unsafe fn run_instruction0f_32(opcode: i32) { gen::interpreter0f::run(opcode as u32 | 0x100) }
pub unsafe fn cycle_internal() {
profiler::stat_increment(stat::CYCLE_INTERNAL);
let mut jit_entry = None;
let initial_eip = *instruction_pointer;
let initial_state_flags = *state_flags;
match tlb_code[(initial_eip as u32 >> 12) as usize] {
None => {},
Some(c) => {
let c = c.as_ref();
if initial_state_flags == c.state_flags {
let state = c.state_table[initial_eip as usize & 0xFFF];
if state != u16::MAX {
jit_entry = Some((c.wasm_table_index.to_u16(), state));
}
else {
profiler::stat_increment(if is_near_end_of_page(initial_eip as u32) {
stat::RUN_INTERPRETED_NEAR_END_OF_PAGE
}
else {
stat::RUN_INTERPRETED_PAGE_HAS_CODE
})
}
}
else {
profiler::stat_increment(stat::RUN_INTERPRETED_DIFFERENT_STATE);
let s = *state_flags;
if c.state_flags.cpl3() != s.cpl3() {
profiler::stat_increment(stat::RUN_INTERPRETED_DIFFERENT_STATE_CPL3);
}
if c.state_flags.has_flat_segmentation() != s.has_flat_segmentation() {
profiler::stat_increment(stat::RUN_INTERPRETED_DIFFERENT_STATE_FLAT);
}
if c.state_flags.is_32() != s.is_32() {
profiler::stat_increment(stat::RUN_INTERPRETED_DIFFERENT_STATE_IS32);
}
if c.state_flags.ssize_32() != s.ssize_32() {
profiler::stat_increment(stat::RUN_INTERPRETED_DIFFERENT_STATE_SS32);
}
}
},
}
if let Some((wasm_table_index, initial_state)) = jit_entry {
if jit::CHECK_JIT_STATE_INVARIANTS {
match get_phys_eip() {
Err(()) => dbg_assert!(false),
Ok(phys_eip) => {
let entry = jit::jit_find_cache_entry(phys_eip, initial_state_flags);
dbg_assert!(entry.wasm_table_index.to_u16() == wasm_table_index);
dbg_assert!(entry.initial_state == initial_state);
},
}
}
profiler::stat_increment(stat::RUN_FROM_CACHE);
let initial_instruction_counter = *instruction_counter;
#[cfg(debug_assertions)]
{
in_jit = true;
}
wasm::call_indirect1(
wasm_table_index as i32 + WASM_TABLE_OFFSET as i32,
initial_state,
);
#[cfg(debug_assertions)]
{
in_jit = false;
}
profiler::stat_increment_by(
stat::RUN_FROM_CACHE_STEPS,
(*instruction_counter - initial_instruction_counter) as u64,
);
dbg_assert!(
*instruction_counter != initial_instruction_counter,
"Instruction counter didn't change"
);
if cfg!(feature = "profiler") {
dbg_assert!(match debug_last_jump {
LastJump::Compiled { .. } => true,
_ => false,
});
#[allow(static_mut_refs)]
let last_jump_addr = debug_last_jump.phys_address().unwrap();
let last_jump_opcode = if last_jump_addr != 0 {
memory::read32s(last_jump_addr)
}
else {
// Happens during exit due to loop iteration limit
0
};
opstats::record_opstat_jit_exit(last_jump_opcode as u32);
}
if is_near_end_of_page(*instruction_pointer as u32) {
profiler::stat_increment(stat::RUN_FROM_CACHE_EXIT_NEAR_END_OF_PAGE);
}
else if Page::page_of(initial_eip as u32) == Page::page_of(*instruction_pointer as u32) {
profiler::stat_increment(stat::RUN_FROM_CACHE_EXIT_SAME_PAGE);
}
else {
profiler::stat_increment(stat::RUN_FROM_CACHE_EXIT_DIFFERENT_PAGE);
}
}
else {
*previous_ip = initial_eip;
let phys_addr = return_on_pagefault!(get_phys_eip());
match tlb_code[(initial_eip as u32 >> 12) as usize] {
None => {},
Some(c) => {
let c = c.as_ref();
if initial_state_flags == c.state_flags
&& c.state_table[initial_eip as usize & 0xFFF] != u16::MAX
{
profiler::stat_increment(stat::RUN_INTERPRETED_PAGE_HAS_ENTRY_AFTER_PAGE_WALK);
return;
}
},
}
#[cfg(feature = "profiler")]
{
if CHECK_MISSED_ENTRY_POINTS {
jit::check_missed_entry_points(phys_addr, initial_state_flags);
}
}
let initial_instruction_counter = *instruction_counter;
jit_run_interpreted(phys_addr);
jit::jit_increase_hotness_and_maybe_compile(
initial_eip,
phys_addr,
get_seg_cs() as u32,
initial_state_flags,
*instruction_counter - initial_instruction_counter,
);
profiler::stat_increment_by(
stat::RUN_INTERPRETED_STEPS,
(*instruction_counter - initial_instruction_counter) as u64,
);
dbg_assert!(
*instruction_counter != initial_instruction_counter,
"Instruction counter didn't change"
);
};
}
pub unsafe fn get_phys_eip() -> OrPageFault<u32> {
let eip = *instruction_pointer;
if 0 != eip & !0xFFF ^ *last_virt_eip {
*eip_phys = (translate_address_read(eip)? ^ eip as u32) as i32;
*last_virt_eip = eip & !0xFFF
}
let phys_addr = (*eip_phys ^ eip) as u32;
dbg_assert!(!memory::in_mapped_range(phys_addr));
return Ok(phys_addr);
}
unsafe fn jit_run_interpreted(mut phys_addr: u32) {
profiler::stat_increment(stat::RUN_INTERPRETED);
dbg_assert!(!memory::in_mapped_range(phys_addr));
jit_block_boundary = false;
let mut i = 0;
loop {
if CHECK_MISSED_ENTRY_POINTS {
let entry = jit::jit_find_cache_entry(phys_addr, *state_flags);
if entry != jit::CachedCode::NONE {
profiler::stat_increment(
stat::RUN_INTERPRETED_MISSED_COMPILED_ENTRY_RUN_INTERPRETED,
);
}
}
i += 1;
let start_eip = *instruction_pointer;
let opcode = *memory::mem8.offset(phys_addr as isize) as i32;
*instruction_pointer += 1;
dbg_assert!(*prefixes == 0);
run_instruction(opcode | (*is_32 as i32) << 8);
dbg_assert!(*prefixes == 0);
if jit_block_boundary
|| Page::page_of(start_eip as u32) != Page::page_of(*instruction_pointer as u32)
// Limit the number of iterations, as jumps within the same page are not counted as
// block boundaries for the interpreter, but only on the next backwards jump
|| (i >= INTERPRETER_ITERATION_LIMIT
&& (start_eip as u32) >= (*instruction_pointer as u32))
{
break;
}
*previous_ip = *instruction_pointer;
phys_addr = return_on_pagefault!(get_phys_eip()) as u32;
}
if cfg!(debug_assertions) {
debug_last_jump = LastJump::Interpreted { phys_addr };
}
*instruction_counter += i;
}
#[no_mangle]
pub fn update_state_flags() {
unsafe {
*state_flags = CachedStateFlags::of_u32(
(*is_32 as u32) << 0
| (*stack_size_32 as u32) << 1
| ((*cpl == 3) as u32) << 2
| (has_flat_segmentation() as u32) << 3,
)
}
}
#[no_mangle]
pub unsafe fn has_flat_segmentation() -> bool {
// cs/ss can't be null
return *segment_offsets.offset(SS as isize) == 0
&& !*segment_is_null.offset(DS as isize)
&& *segment_offsets.offset(DS as isize) == 0
&& *segment_offsets.offset(CS as isize) == 0;
}
pub unsafe fn run_prefix_instruction() {
run_instruction(return_on_pagefault!(read_imm8()) | (is_osize_32() as i32) << 8);
}
pub unsafe fn segment_prefix_op(seg: i32) {
dbg_assert!(seg <= 5 && seg >= 0);
*prefixes |= seg as u8 + 1;
run_prefix_instruction();
*prefixes = 0
}
#[no_mangle]
pub unsafe fn main_loop() -> f64 {
profiler::stat_increment(stat::MAIN_LOOP);
let start = js::microtick();
if *in_hlt {
if *flags & FLAG_INTERRUPT != 0 {
let t = js::run_hardware_timers(*acpi_enabled, start);
handle_irqs();
if *in_hlt {
profiler::stat_increment(stat::MAIN_LOOP_IDLE);
return t;
}
}
else {
// dead
return 100.0;
}
}
loop {
do_many_cycles_native();
let now = js::microtick();
let t = js::run_hardware_timers(*acpi_enabled, now);
handle_irqs();
if *in_hlt {
return t;
}
if now - start > TIME_PER_FRAME {
break;
}
}
return 0.0;
}
pub unsafe fn do_many_cycles_native() {
profiler::stat_increment(stat::DO_MANY_CYCLES);
let initial_instruction_counter = *instruction_counter;
while (*instruction_counter).wrapping_sub(initial_instruction_counter) < LOOP_COUNTER as u32
&& !*in_hlt
{
cycle_internal();
}
}
#[cold]
pub unsafe fn trigger_de() {
dbg_log!("#de");
*instruction_pointer = *previous_ip;
if DEBUG {
if js::cpu_exception_hook(CPU_EXCEPTION_DE) {
return;
}
}
call_interrupt_vector(CPU_EXCEPTION_DE, false, None);
}
#[inline(never)]
pub unsafe fn trigger_ud() {
dbg_log!("#ud");
dbg_trace();
*instruction_pointer = *previous_ip;
if DEBUG {
if js::cpu_exception_hook(CPU_EXCEPTION_UD) {
return;
}
}
call_interrupt_vector(CPU_EXCEPTION_UD, false, None);
}
#[inline(never)]
pub unsafe fn trigger_nm() {
dbg_log!("#nm eip={:x}", *previous_ip);
dbg_trace();
*instruction_pointer = *previous_ip;
if DEBUG {
if js::cpu_exception_hook(CPU_EXCEPTION_NM) {
return;
}
}
call_interrupt_vector(CPU_EXCEPTION_NM, false, None);
}
#[inline(never)]
pub unsafe fn trigger_gp(code: i32) {
dbg_log!("#gp");
*instruction_pointer = *previous_ip;
if DEBUG {
if js::cpu_exception_hook(CPU_EXCEPTION_GP) {
return;
}
}
call_interrupt_vector(CPU_EXCEPTION_GP, false, Some(code));
}
#[cold]
pub unsafe fn virt_boundary_read16(low: u32, high: u32) -> i32 {
dbg_assert!(low & 0xFFF == 0xFFF);
dbg_assert!(high & 0xFFF == 0);
return memory::read8(low as u32) | memory::read8(high as u32) << 8;
}
#[cold]
pub unsafe fn virt_boundary_read32s(low: u32, high: u32) -> i32 {
dbg_assert!(low & 0xFFF >= 0xFFD);
dbg_assert!(high - 3 & 0xFFF == low & 0xFFF);
let mid;
if 0 != low & 1 {
if 0 != low & 2 {
// 0xFFF
mid = memory::read16(high - 2)
}
else {
// 0xFFD
mid = memory::read16(low + 1)
}
}
else {
// 0xFFE
mid = virt_boundary_read16(low + 1, high - 1)
}
return memory::read8(low as u32) | mid << 8 | memory::read8(high as u32) << 24;
}
#[cold]
pub unsafe fn virt_boundary_write16(low: u32, high: u32, value: i32) {
dbg_assert!(low & 0xFFF == 0xFFF);
dbg_assert!(high & 0xFFF == 0);
memory::write8(low as u32, value);
memory::write8(high as u32, value >> 8);
}
#[cold]
pub unsafe fn virt_boundary_write32(low: u32, high: u32, value: i32) {
dbg_assert!(low & 0xFFF >= 0xFFD);
dbg_assert!(high - 3 & 0xFFF == low & 0xFFF);
memory::write8(low as u32, value);
if 0 != low & 1 {
if 0 != low & 2 {
// 0xFFF
memory::write8((high - 2) as u32, value >> 8);
memory::write8((high - 1) as u32, value >> 16);
}
else {
// 0xFFD
memory::write8((low + 1) as u32, value >> 8);
memory::write8((low + 2) as u32, value >> 16);
}
}
else {
// 0xFFE
memory::write8((low + 1) as u32, value >> 8);
memory::write8((high - 1) as u32, value >> 16);
}
memory::write8(high as u32, value >> 24);
}
pub unsafe fn safe_read8(addr: i32) -> OrPageFault<i32> {
Ok(memory::read8(translate_address_read(addr)?))
}
pub unsafe fn safe_read16(addr: i32) -> OrPageFault<i32> {
if addr & 0xFFF == 0xFFF {
Ok(safe_read8(addr)? | safe_read8(addr + 1)? << 8)
}
else {
Ok(memory::read16(translate_address_read(addr)?))
}
}
pub unsafe fn safe_read32s(addr: i32) -> OrPageFault<i32> {
if addr & 0xFFF >= 0xFFD {
Ok(safe_read16(addr)? | safe_read16(addr + 2)? << 16)
}
else {
Ok(memory::read32s(translate_address_read(addr)?))
}
}
pub unsafe fn safe_read_f32(addr: i32) -> OrPageFault<f32> {
Ok(f32::from_bits(i32::cast_unsigned(safe_read32s(addr)?)))
}
pub unsafe fn safe_read64s(addr: i32) -> OrPageFault<u64> {
if addr & 0xFFF > 0x1000 - 8 {
Ok(safe_read32s(addr)? as u32 as u64 | (safe_read32s(addr + 4)? as u32 as u64) << 32)
}
else {
Ok(memory::read64s(translate_address_read(addr)?) as u64)
}
}
pub unsafe fn safe_read128s(addr: i32) -> OrPageFault<reg128> {
if addr & 0xFFF > 0x1000 - 16 {
Ok(reg128 {
u64: [safe_read64s(addr)?, safe_read64s(addr + 8)?],
})
}
else {
Ok(memory::read128(translate_address_read(addr)?))
}
}
#[no_mangle]
#[cfg(feature = "profiler")]
pub fn report_safe_read_jit_slow(address: u32, entry: i32) {
if entry & TLB_VALID == 0 {
profiler::stat_increment(stat::SAFE_READ_SLOW_NOT_VALID);
}
else if entry & TLB_IN_MAPPED_RANGE != 0 {
profiler::stat_increment(stat::SAFE_READ_SLOW_IN_MAPPED_RANGE);
}
else if entry & TLB_NO_USER != 0 {
profiler::stat_increment(stat::SAFE_READ_SLOW_NOT_USER);
}
else if address & 0xFFF > 0x1000 - 16 {
profiler::stat_increment(stat::SAFE_READ_SLOW_PAGE_CROSSED);
}
else {
dbg_log!("Unexpected entry bit: {:x} (read at {:x})", entry, address);
dbg_assert!(false);
}
}
#[no_mangle]
#[cfg(feature = "profiler")]
pub fn report_safe_write_jit_slow(address: u32, entry: i32) {
if entry & TLB_VALID == 0 {
profiler::stat_increment(stat::SAFE_WRITE_SLOW_NOT_VALID);
}
else if entry & TLB_IN_MAPPED_RANGE != 0 {
profiler::stat_increment(stat::SAFE_WRITE_SLOW_IN_MAPPED_RANGE);
}
else if entry & TLB_HAS_CODE != 0 {
profiler::stat_increment(stat::SAFE_WRITE_SLOW_HAS_CODE);
}
else if entry & TLB_READONLY != 0 {
profiler::stat_increment(stat::SAFE_WRITE_SLOW_READ_ONLY);
}
else if entry & TLB_NO_USER != 0 {
profiler::stat_increment(stat::SAFE_WRITE_SLOW_NOT_USER);
}
else if address & 0xFFF > 0x1000 - 16 {
profiler::stat_increment(stat::SAFE_WRITE_SLOW_PAGE_CROSSED);
}
else {
dbg_assert!(false);
}
}
#[no_mangle]
#[cfg(feature = "profiler")]
pub fn report_safe_read_write_jit_slow(address: u32, entry: i32) {
if entry & TLB_VALID == 0 {
profiler::stat_increment(stat::SAFE_READ_WRITE_SLOW_NOT_VALID);
}
else if entry & TLB_IN_MAPPED_RANGE != 0 {
profiler::stat_increment(stat::SAFE_READ_WRITE_SLOW_IN_MAPPED_RANGE);
}
else if entry & TLB_HAS_CODE != 0 {
profiler::stat_increment(stat::SAFE_READ_WRITE_SLOW_HAS_CODE);
}
else if entry & TLB_READONLY != 0 {
profiler::stat_increment(stat::SAFE_READ_WRITE_SLOW_READ_ONLY);
}
else if entry & TLB_NO_USER != 0 {
profiler::stat_increment(stat::SAFE_READ_WRITE_SLOW_NOT_USER);
}
else if address & 0xFFF > 0x1000 - 16 {
profiler::stat_increment(stat::SAFE_READ_WRITE_SLOW_PAGE_CROSSED);
}
else {
dbg_assert!(false);
}
}
#[repr(align(0x1000))]
struct ScratchBuffer([u8; 0x1000 * 2]);
static mut jit_paging_scratch_buffer: ScratchBuffer = ScratchBuffer([0; 2 * 0x1000]);
pub unsafe fn safe_read_slow_jit(
addr: i32,
bitsize: i32,
eip_offset_in_page: i32,
is_write: bool,
) -> i32 {
dbg_assert!(eip_offset_in_page >= 0 && eip_offset_in_page < 0x1000);
if is_write && Page::page_of(*instruction_pointer as u32) == Page::page_of(addr as u32) {
// XXX: Check based on virtual address
dbg_log!(
"SMC (rmw): bits={} eip={:x} writeaddr={:x}",
bitsize,
(*instruction_pointer & !0xFFF | eip_offset_in_page) as u32,
addr as u32
);
}
let crosses_page = (addr & 0xFFF) + bitsize / 8 > 0x1000;
let addr_low = match if is_write {
translate_address_write_jit_and_can_skip_dirty(addr).map(|x| x.0)
}
else {
translate_address_read_jit(addr)
} {
Err(()) => {
*instruction_pointer = *instruction_pointer & !0xFFF | eip_offset_in_page;
return 1;
},
Ok(addr) => addr,
};
if crosses_page {
let boundary_addr = (addr | 0xFFF) + 1;
let addr_high = match if is_write {
translate_address_write_jit_and_can_skip_dirty(boundary_addr).map(|x| x.0)
}
else {
translate_address_read_jit(boundary_addr)
} {
Err(()) => {
*instruction_pointer = *instruction_pointer & !0xFFF | eip_offset_in_page;
return 1;
},
Ok(addr) => addr,
};
// TODO: Could check if virtual pages point to consecutive physical and go to fast path
// do read, write into scratch buffer
let scratch = &raw mut jit_paging_scratch_buffer.0 as u32;
dbg_assert!(scratch & 0xFFF == 0);
for s in addr_low..((addr_low | 0xFFF) + 1) {
*(scratch as *mut u8).offset((s & 0xFFF) as isize) = memory::read8(s) as u8
}
for s in addr_high..(addr_high + (addr + bitsize / 8 & 0xFFF) as u32) {
*(scratch as *mut u8).offset((0x1000 | s & 0xFFF) as isize) = memory::read8(s) as u8
}
((scratch as i32) ^ addr) & !0xFFF
}
else if memory::in_mapped_range(addr_low) {
let scratch = &raw mut jit_paging_scratch_buffer.0[0];
match bitsize {
128 => ptr::write_unaligned(
scratch.offset(addr_low as isize & 0xFFF) as *mut reg128,
memory::read128(addr_low),
),
64 => ptr::write_unaligned(
scratch.offset(addr_low as isize & 0xFFF) as *mut i64,
memory::read64s(addr_low),
),
32 => ptr::write_unaligned(
scratch.offset(addr_low as isize & 0xFFF) as *mut i32,
memory::read32s(addr_low),
),
16 => ptr::write_unaligned(
scratch.offset(addr_low as isize & 0xFFF) as *mut u16,
memory::read16(addr_low) as u16,
),
8 => {
*(scratch.offset(addr_low as isize & 0xFFF) as *mut u8) =
memory::read8(addr_low) as u8
},
_ => {
dbg_assert!(false);
},
}
((scratch as i32) ^ addr) & !0xFFF
}
else {
((addr_low as i32 + memory::mem8 as i32) ^ addr) & !0xFFF
}
}
#[no_mangle]
pub unsafe fn safe_read8_slow_jit(addr: i32, eip: i32) -> i32 {
safe_read_slow_jit(addr, 8, eip, false)
}
#[no_mangle]
pub unsafe fn safe_read16_slow_jit(addr: i32, eip: i32) -> i32 {
safe_read_slow_jit(addr, 16, eip, false)
}
#[no_mangle]
pub unsafe fn safe_read32s_slow_jit(addr: i32, eip: i32) -> i32 {
safe_read_slow_jit(addr, 32, eip, false)
}
#[no_mangle]
pub unsafe fn safe_read64s_slow_jit(addr: i32, eip: i32) -> i32 {
safe_read_slow_jit(addr, 64, eip, false)
}
#[no_mangle]
pub unsafe fn safe_read128s_slow_jit(addr: i32, eip: i32) -> i32 {
safe_read_slow_jit(addr, 128, eip, false)
}
#[no_mangle]
pub unsafe fn get_phys_eip_slow_jit(addr: i32) -> i32 {
match translate_address_read_jit(addr) {
Err(()) => 1,
Ok(addr_low) => {
dbg_assert!(!memory::in_mapped_range(addr_low as u32)); // same assumption as in read_imm8
((addr_low as i32 + memory::mem8 as i32) ^ addr) & !0xFFF
},
}
}
#[no_mangle]
pub unsafe fn safe_read_write8_slow_jit(addr: i32, eip: i32) -> i32 {
safe_read_slow_jit(addr, 8, eip, true)
}
#[no_mangle]
pub unsafe fn safe_read_write16_slow_jit(addr: i32, eip: i32) -> i32 {
safe_read_slow_jit(addr, 16, eip, true)
}
#[no_mangle]
pub unsafe fn safe_read_write32s_slow_jit(addr: i32, eip: i32) -> i32 {
safe_read_slow_jit(addr, 32, eip, true)
}
#[no_mangle]
pub unsafe fn safe_read_write64_slow_jit(addr: i32, eip: i32) -> i32 {
safe_read_slow_jit(addr, 64, eip, true)
}
pub unsafe fn safe_write_slow_jit(
addr: i32,
bitsize: i32,
value_low: u64,
value_high: u64,
eip_offset_in_page: i32,
) -> i32 {
dbg_assert!(eip_offset_in_page >= 0 && eip_offset_in_page < 0x1000);
if Page::page_of(*instruction_pointer as u32) == Page::page_of(addr as u32) {
// XXX: Check based on virtual address
dbg_log!(
"SMC: bits={} eip={:x} writeaddr={:x} value={:x}",
bitsize,
(*instruction_pointer & !0xFFF | eip_offset_in_page) as u32,
addr as u32,
value_low,
);
}
let crosses_page = (addr & 0xFFF) + bitsize / 8 > 0x1000;
let (addr_low, can_skip_dirty_page) = match translate_address_write_jit_and_can_skip_dirty(addr)
{
Err(()) => {
*instruction_pointer = *instruction_pointer & !0xFFF | eip_offset_in_page;
return 1;
},
Ok(x) => x,
};
if crosses_page {
let (addr_high, _) =
match translate_address_write_jit_and_can_skip_dirty((addr | 0xFFF) + 1) {
Err(()) => {
*instruction_pointer = *instruction_pointer & !0xFFF | eip_offset_in_page;
return 1;
},
Ok(x) => x,
};
// TODO: Could check if virtual pages point to consecutive physical and go to fast path
// do write, return dummy pointer for fast path to write into
match bitsize {
128 => safe_write128(
addr,
reg128 {
u64: [value_low, value_high],
},
)
.unwrap(),
64 => safe_write64(addr, value_low).unwrap(),
32 => virt_boundary_write32(
addr_low,
addr_high | (addr as u32 + 3 & 3),
value_low as i32,
),
16 => virt_boundary_write16(addr_low, addr_high, value_low as i32),
8 => {
dbg_assert!(false);
},
_ => {
dbg_assert!(false);
},
}
let scratch = &raw mut jit_paging_scratch_buffer.0 as u32;
dbg_assert!(scratch & 0xFFF == 0);
((scratch as i32) ^ addr) & !0xFFF
}
else if memory::in_mapped_range(addr_low) {
match bitsize {
128 => memory::mmap_write128(addr_low, value_low, value_high),
64 => memory::mmap_write64(addr_low, value_low),
32 => memory::mmap_write32(addr_low, value_low as i32),
16 => memory::mmap_write16(addr_low, (value_low & 0xFFFF) as i32),
8 => memory::mmap_write8(addr_low, (value_low & 0xFF) as i32),
_ => {
dbg_assert!(false);
},
}
let scratch = &raw mut jit_paging_scratch_buffer.0 as u32;
dbg_assert!(scratch & 0xFFF == 0);
((scratch as i32) ^ addr) & !0xFFF
}
else {
if !can_skip_dirty_page {
jit::jit_dirty_page(Page::page_of(addr_low));
}
((addr_low as i32 + memory::mem8 as i32) ^ addr) & !0xFFF
}
}
#[no_mangle]
pub unsafe fn safe_write8_slow_jit(addr: i32, value: u32, eip_offset_in_page: i32) -> i32 {
safe_write_slow_jit(addr, 8, value as u64, 0, eip_offset_in_page)
}
#[no_mangle]
pub unsafe fn safe_write16_slow_jit(addr: i32, value: u32, eip_offset_in_page: i32) -> i32 {
safe_write_slow_jit(addr, 16, value as u64, 0, eip_offset_in_page)
}
#[no_mangle]
pub unsafe fn safe_write32_slow_jit(addr: i32, value: u32, eip_offset_in_page: i32) -> i32 {
safe_write_slow_jit(addr, 32, value as u64, 0, eip_offset_in_page)
}
#[no_mangle]
pub unsafe fn safe_write64_slow_jit(addr: i32, value: u64, eip_offset_in_page: i32) -> i32 {
safe_write_slow_jit(addr, 64, value, 0, eip_offset_in_page)
}
#[no_mangle]
pub unsafe fn safe_write128_slow_jit(
addr: i32,
low: u64,
high: u64,
eip_offset_in_page: i32,
) -> i32 {
safe_write_slow_jit(addr, 128, low, high, eip_offset_in_page)
}
pub unsafe fn safe_write8(addr: i32, value: i32) -> OrPageFault<()> {
let (phys_addr, can_skip_dirty_page) = translate_address_write_and_can_skip_dirty(addr)?;
if memory::in_mapped_range(phys_addr) {
memory::mmap_write8(phys_addr, value);
}
else {
if !can_skip_dirty_page {
jit::jit_dirty_page(Page::page_of(phys_addr));
}
else {
dbg_assert!(!jit::jit_page_has_code(Page::page_of(phys_addr as u32)));
}
memory::write8_no_mmap_or_dirty_check(phys_addr, value);
};
Ok(())
}
pub unsafe fn safe_write16(addr: i32, value: i32) -> OrPageFault<()> {
let (phys_addr, can_skip_dirty_page) = translate_address_write_and_can_skip_dirty(addr)?;
dbg_assert!(value >= 0 && value < 0x10000);
if addr & 0xFFF == 0xFFF {
virt_boundary_write16(phys_addr, translate_address_write(addr + 1)?, value);
}
else if memory::in_mapped_range(phys_addr) {
memory::mmap_write16(phys_addr, value);
}
else {
if !can_skip_dirty_page {
jit::jit_dirty_page(Page::page_of(phys_addr));
}
else {
dbg_assert!(!jit::jit_page_has_code(Page::page_of(phys_addr as u32)));
}
memory::write16_no_mmap_or_dirty_check(phys_addr, value);
};
Ok(())
}
pub unsafe fn safe_write32(addr: i32, value: i32) -> OrPageFault<()> {
let (phys_addr, can_skip_dirty_page) = translate_address_write_and_can_skip_dirty(addr)?;
if addr & 0xFFF > 0x1000 - 4 {
virt_boundary_write32(
phys_addr,
translate_address_write(addr + 3 & !3)? | (addr as u32 + 3 & 3),
value,
);
}
else if memory::in_mapped_range(phys_addr) {
memory::mmap_write32(phys_addr, value);
}
else {
if !can_skip_dirty_page {
jit::jit_dirty_page(Page::page_of(phys_addr));
}
else {
dbg_assert!(!jit::jit_page_has_code(Page::page_of(phys_addr as u32)));
}
memory::write32_no_mmap_or_dirty_check(phys_addr, value);
};
Ok(())
}
pub unsafe fn safe_write64(addr: i32, value: u64) -> OrPageFault<()> {
if addr & 0xFFF > 0x1000 - 8 {
writable_or_pagefault(addr, 8)?;
safe_write32(addr, value as i32).unwrap();
safe_write32(addr + 4, (value >> 32) as i32).unwrap();
}
else {
let (phys_addr, can_skip_dirty_page) = translate_address_write_and_can_skip_dirty(addr)?;
if memory::in_mapped_range(phys_addr) {
memory::mmap_write64(phys_addr, value);
}
else {
if !can_skip_dirty_page {
jit::jit_dirty_page(Page::page_of(phys_addr));
}
else {
dbg_assert!(!jit::jit_page_has_code(Page::page_of(phys_addr as u32)));
}
memory::write64_no_mmap_or_dirty_check(phys_addr, value);
}
};
Ok(())
}
pub unsafe fn safe_write128(addr: i32, value: reg128) -> OrPageFault<()> {
if addr & 0xFFF > 0x1000 - 16 {
writable_or_pagefault(addr, 16)?;
safe_write64(addr, value.u64[0]).unwrap();
safe_write64(addr + 8, value.u64[1]).unwrap();
}
else {
let (phys_addr, can_skip_dirty_page) = translate_address_write_and_can_skip_dirty(addr)?;
if memory::in_mapped_range(phys_addr) {
memory::mmap_write128(phys_addr, value.u64[0], value.u64[1]);
}
else {
if !can_skip_dirty_page {
jit::jit_dirty_page(Page::page_of(phys_addr));
}
else {
dbg_assert!(!jit::jit_page_has_code(Page::page_of(phys_addr as u32)));
}
memory::write128_no_mmap_or_dirty_check(phys_addr, value);
}
};
Ok(())
}
#[inline(always)]
pub unsafe fn safe_read_write8(addr: i32, instruction: &dyn Fn(i32) -> i32) {
let (phys_addr, can_skip_dirty_page) =
return_on_pagefault!(translate_address_write_and_can_skip_dirty(addr));
let x = memory::read8(phys_addr);
let value = instruction(x);
dbg_assert!(value >= 0 && value < 0x100);
if memory::in_mapped_range(phys_addr) {
memory::mmap_write8(phys_addr, value);
}
else {
if !can_skip_dirty_page {
jit::jit_dirty_page(Page::page_of(phys_addr));
}
else {
dbg_assert!(!jit::jit_page_has_code(Page::page_of(phys_addr as u32)));
}
memory::write8_no_mmap_or_dirty_check(phys_addr, value);
}
}
#[inline(always)]
pub unsafe fn safe_read_write16(addr: i32, instruction: &dyn Fn(i32) -> i32) {
let (phys_addr, can_skip_dirty_page) =
return_on_pagefault!(translate_address_write_and_can_skip_dirty(addr));
if phys_addr & 0xFFF == 0xFFF {
let phys_addr_high = return_on_pagefault!(translate_address_write(addr + 1));
let x = virt_boundary_read16(phys_addr, phys_addr_high);
virt_boundary_write16(phys_addr, phys_addr_high, instruction(x));
}
else {
let x = memory::read16(phys_addr);
let value = instruction(x);
dbg_assert!(value >= 0 && value < 0x10000);
if memory::in_mapped_range(phys_addr) {
memory::mmap_write16(phys_addr, value);
}
else {
if !can_skip_dirty_page {
jit::jit_dirty_page(Page::page_of(phys_addr));
}
else {
dbg_assert!(!jit::jit_page_has_code(Page::page_of(phys_addr as u32)));
}
memory::write16_no_mmap_or_dirty_check(phys_addr, value);
};
}
}
#[inline(always)]
pub unsafe fn safe_read_write32(addr: i32, instruction: &dyn Fn(i32) -> i32) {
let (phys_addr, can_skip_dirty_page) =
return_on_pagefault!(translate_address_write_and_can_skip_dirty(addr));
if phys_addr & 0xFFF >= 0xFFD {
let phys_addr_high = return_on_pagefault!(translate_address_write(addr + 3 & !3));
let phys_addr_high = phys_addr_high | (addr as u32) + 3 & 3;
let x = virt_boundary_read32s(phys_addr, phys_addr_high);
virt_boundary_write32(phys_addr, phys_addr_high, instruction(x));
}
else {
let x = memory::read32s(phys_addr);
let value = instruction(x);
if memory::in_mapped_range(phys_addr) {
memory::mmap_write32(phys_addr, value);
}
else {
if !can_skip_dirty_page {
jit::jit_dirty_page(Page::page_of(phys_addr));
}
else {
dbg_assert!(!jit::jit_page_has_code(Page::page_of(phys_addr as u32)));
}
memory::write32_no_mmap_or_dirty_check(phys_addr, value);
};
}
}
fn get_reg8_index(index: i32) -> i32 { return index << 2 & 12 | index >> 2 & 1; }
pub unsafe fn read_reg8(index: i32) -> i32 {
dbg_assert!(index >= 0 && index < 8);
return *reg8.offset(get_reg8_index(index) as isize) as i32;
}
pub unsafe fn write_reg8(index: i32, value: i32) {
dbg_assert!(index >= 0 && index < 8);
*reg8.offset(get_reg8_index(index) as isize) = value as u8;
}
fn get_reg16_index(index: i32) -> i32 { return index << 1; }
pub unsafe fn read_reg16(index: i32) -> i32 {
dbg_assert!(index >= 0 && index < 8);
return *reg16.offset(get_reg16_index(index) as isize) as i32;
}
pub unsafe fn write_reg16(index: i32, value: i32) {
dbg_assert!(index >= 0 && index < 8);
*reg16.offset(get_reg16_index(index) as isize) = value as u16;
}
pub unsafe fn read_reg32(index: i32) -> i32 {
dbg_assert!(index >= 0 && index < 8);
*reg32.offset(index as isize)
}
pub unsafe fn write_reg32(index: i32, value: i32) {
dbg_assert!(index >= 0 && index < 8);
*reg32.offset(index as isize) = value;
}
pub unsafe fn read_mmx32s(r: i32) -> i32 { (*fpu_st.offset(r as isize)).mantissa as i32 }
pub unsafe fn read_mmx64s(r: i32) -> u64 { (*fpu_st.offset(r as isize)).mantissa }
pub unsafe fn write_mmx_reg64(r: i32, data: u64) { (*fpu_st.offset(r as isize)).mantissa = data; }
pub unsafe fn read_xmm_f32(r: i32) -> f32 { return (*reg_xmm.offset(r as isize)).f32[0]; }
pub unsafe fn read_xmm32(r: i32) -> i32 { return (*reg_xmm.offset(r as isize)).u32[0] as i32; }
pub unsafe fn read_xmm64s(r: i32) -> u64 { (*reg_xmm.offset(r as isize)).u64[0] }
pub unsafe fn read_xmm128s(r: i32) -> reg128 { return *reg_xmm.offset(r as isize); }
pub unsafe fn write_xmm_f32(r: i32, data: f32) { (*reg_xmm.offset(r as isize)).f32[0] = data; }
pub unsafe fn write_xmm32(r: i32, data: i32) { (*reg_xmm.offset(r as isize)).i32[0] = data; }
pub unsafe fn write_xmm64(r: i32, data: u64) { (*reg_xmm.offset(r as isize)).u64[0] = data }
pub unsafe fn write_xmm_f64(r: i32, data: f64) { (*reg_xmm.offset(r as isize)).f64[0] = data }
pub unsafe fn write_xmm128(r: i32, i0: i32, i1: i32, i2: i32, i3: i32) {
let x = reg128 {
u32: [i0 as u32, i1 as u32, i2 as u32, i3 as u32],
};
*reg_xmm.offset(r as isize) = x;
}
pub unsafe fn write_xmm128_2(r: i32, i0: u64, i1: u64) {
*reg_xmm.offset(r as isize) = reg128 { u64: [i0, i1] };
}
pub unsafe fn write_xmm_reg128(r: i32, data: reg128) { *reg_xmm.offset(r as isize) = data; }
/// Set the fpu tag word to valid and the top-of-stack to 0 on mmx instructions
pub fn transition_fpu_to_mmx() {
unsafe {
fpu_set_tag_word(0);
*fpu_stack_ptr = 0;
}
}
pub unsafe fn task_switch_test() -> bool {
if 0 != *cr & (CR0_EM | CR0_TS) {
trigger_nm();
return false;
}
else {
return true;
};
}
pub unsafe fn set_mxcsr(new_mxcsr: i32) {
dbg_assert!(new_mxcsr & !MXCSR_MASK == 0); // checked by caller
if *mxcsr & MXCSR_DAZ == 0 && new_mxcsr & MXCSR_DAZ != 0 {
dbg_log!("Warning: Unimplemented MXCSR bit: Denormals Are Zero");
}
if *mxcsr & MXCSR_FZ == 0 && new_mxcsr & MXCSR_FZ != 0 {
dbg_log!("Warning: Unimplemented MXCSR bit: Flush To Zero");
}
let rounding_mode = new_mxcsr >> MXCSR_RC_SHIFT & 3;
if *mxcsr >> MXCSR_RC_SHIFT & 3 == 0 && rounding_mode != 0 {
dbg_log!(
"Warning: Unimplemented MXCSR rounding mode: {}",
rounding_mode
);
}
let exception_mask = new_mxcsr >> 7 & 0b111111;
if *mxcsr >> 7 & 0b111111 != exception_mask && exception_mask != 0b111111 {
dbg_log!(
"Warning: Unimplemented MXCSR exception mask: 0b{:b}",
exception_mask
);
}
*mxcsr = new_mxcsr;
}
#[no_mangle]
pub unsafe fn task_switch_test_jit(eip_offset_in_page: i32) {
dbg_assert!(0 != *cr & (CR0_EM | CR0_TS));
dbg_assert!(eip_offset_in_page >= 0 && eip_offset_in_page < 0x1000);
trigger_nm_jit(eip_offset_in_page);
}
pub unsafe fn task_switch_test_mmx() -> bool {
if *cr.offset(4) & CR4_OSFXSR == 0 {
dbg_log!("Warning: Unimplemented task switch test with cr4.osfxsr=0");
}
if 0 != *cr & CR0_EM {
trigger_ud();
return false;
}
else if 0 != *cr & CR0_TS {
trigger_nm();
return false;
}
else {
return true;
};
}
#[no_mangle]
pub unsafe fn task_switch_test_mmx_jit(eip_offset_in_page: i32) {
dbg_assert!(eip_offset_in_page >= 0 && eip_offset_in_page < 0x1000);
if *cr.offset(4) & CR4_OSFXSR == 0 {
dbg_log!("Warning: Unimplemented task switch test with cr4.osfxsr=0");
}
if 0 != *cr & CR0_EM {
trigger_ud_jit(eip_offset_in_page);
}
else if 0 != *cr & CR0_TS {
trigger_nm_jit(eip_offset_in_page);
}
else {
dbg_assert!(false);
}
}
pub unsafe fn read_moffs() -> OrPageFault<i32> {
// read 2 or 4 byte from ip, depending on address size attribute
if is_asize_32() {
read_imm32s()
}
else {
read_imm16()
}
}
#[no_mangle]
pub unsafe fn get_real_eip() -> i32 {
// Returns the 'real' instruction pointer, without segment offset
return *instruction_pointer - get_seg_cs();
}
pub unsafe fn get_stack_reg() -> i32 {
if *stack_size_32 {
return read_reg32(ESP);
}
else {
return read_reg16(SP);
};
}
pub unsafe fn set_stack_reg(value: i32) {
if *stack_size_32 {
write_reg32(ESP, value)
}
else {
write_reg16(SP, value)
};
}
pub unsafe fn get_reg_asize(reg: i32) -> i32 {
dbg_assert!(reg == ECX || reg == ESI || reg == EDI);
let r = read_reg32(reg);
if is_asize_32() {
return r;
}
else {
return r & 0xFFFF;
};
}
pub unsafe fn set_reg_asize(is_asize_32: bool, reg: i32, value: i32) {
dbg_assert!(reg == ECX || reg == ESI || reg == EDI);
if is_asize_32 {
write_reg32(reg, value)
}
else {
write_reg16(reg, value)
};
}
pub unsafe fn decr_ecx_asize(is_asize_32: bool) -> i32 {
return if is_asize_32 {
write_reg32(ECX, read_reg32(ECX) - 1);
read_reg32(ECX)
}
else {
write_reg16(CX, read_reg16(CX) - 1);
read_reg16(CX)
};
}
#[no_mangle]
pub unsafe fn set_tsc(low: u32, high: u32) {
let new_value = low as u64 | (high as u64) << 32;
let current_value = read_tsc();
tsc_offset = current_value - new_value;
}
#[no_mangle]
pub unsafe fn read_tsc() -> u64 {
let value = (js::microtick() * TSC_RATE) as u64 - tsc_offset;
if !TSC_ENABLE_IMPRECISE_BROWSER_WORKAROUND {
return value;
}
if value == tsc_last_value {
// If the browser returns the same value as last time, extrapolate based on the number of
// rdtsc calls between the last two changes
tsc_number_of_same_readings += 1;
let extra = (tsc_number_of_same_readings * tsc_resolution) / tsc_speed;
let extra = u64::min(extra, tsc_resolution - 1);
#[cfg(debug_assertions)]
{
tsc_last_extra = extra;
}
return value + extra;
}
#[cfg(debug_assertions)]
if tsc_last_extra != 0 {
if TSC_VERBOSE_LOGGING || tsc_last_extra >= tsc_resolution {
dbg_log!(
"rdtsc: jump from {}+{} to {} (diff {}, {}%)",
tsc_last_value as u64,
tsc_last_extra as u64,
value,
value - (tsc_last_value + tsc_last_extra),
(100 * tsc_last_extra) / tsc_resolution,
);
dbg_assert!(tsc_last_extra < tsc_resolution, "XXX: Overshot tsc");
}
tsc_last_extra = 0;
}
let d = value - tsc_last_value;
if d < tsc_resolution {
dbg_log!("rdtsc resolution: {}", d);
}
tsc_resolution = tsc_resolution.min(d);
tsc_last_value = value;
if tsc_number_of_same_readings != 0 {
tsc_speed = tsc_number_of_same_readings;
tsc_number_of_same_readings = 0;
}
value
}
pub unsafe fn vm86_mode() -> bool { return *flags & FLAG_VM == FLAG_VM; }
#[no_mangle]
pub unsafe fn getiopl() -> i32 { return *flags >> 12 & 3; }
#[no_mangle]
#[cfg(feature = "profiler")]
pub unsafe fn get_opstats_buffer(
compiled: bool,
jit_exit: bool,
unguarded_register: bool,
wasm_size: bool,
opcode: u8,
is_0f: bool,
is_mem: bool,
fixed_g: u8,
) -> f64 {
{
let index = (is_0f as usize) << 12
| (opcode as usize) << 4
| (is_mem as usize) << 3
| fixed_g as usize;
(if compiled {
opstats::opstats_compiled_buffer[index]
}
else if jit_exit {
opstats::opstats_jit_exit_buffer[index]
}
else if unguarded_register {
opstats::opstats_unguarded_register_buffer[index]
}
else if wasm_size {
opstats::opstats_wasm_size[index]
}
else {
opstats::opstats_buffer[index]
}) as f64
}
}
#[no_mangle]
#[cfg(not(feature = "profiler"))]
pub unsafe fn get_opstats_buffer() -> f64 { 0.0 }
pub fn clear_tlb_code(page: i32) {
unsafe {
if let Some(c) = tlb_code[page as usize] {
drop(Box::from_raw(c.as_ptr()));
}
tlb_code[page as usize] = None;
}
}
pub unsafe fn invlpg(addr: i32) {
let page = (addr as u32 >> 12) as i32;
// Note: Doesn't remove this page from valid_tlb_entries: This isn't
// necessary, because when valid_tlb_entries grows too large, it will be
// empties by calling clear_tlb, which removes this entry as it isn't global.
// This however means that valid_tlb_entries can contain some invalid entries
clear_tlb_code(page);
tlb_data[page as usize] = 0;
*last_virt_eip = -1;
}
#[no_mangle]
pub unsafe fn update_eflags(new_flags: i32) {
let mut dont_update = FLAG_RF | FLAG_VM | FLAG_VIP | FLAG_VIF;
let mut clear = !FLAG_VIP & !FLAG_VIF & FLAGS_MASK;
if 0 != *flags & FLAG_VM {
// other case needs to be handled in popf or iret
dbg_assert!(getiopl() == 3);
dont_update |= FLAG_IOPL;
// don't clear vip or vif
clear |= FLAG_VIP | FLAG_VIF
}
else {
if !*protected_mode {
dbg_assert!(*cpl == 0);
}
if 0 != *cpl {
// cpl > 0
// cannot update iopl
dont_update |= FLAG_IOPL;
if *cpl as i32 > getiopl() {
// cpl > iopl
// cannot update interrupt flag
dont_update |= FLAG_INTERRUPT
}
}
}
*flags = (new_flags ^ (*flags ^ new_flags) & dont_update) & clear | FLAGS_DEFAULT;
*flags_changed = 0;
if *flags & FLAG_TRAP != 0 {
dbg_log!("Not supported: trap flag");
}
*flags &= !FLAG_TRAP;
}
#[no_mangle]
pub unsafe fn get_valid_tlb_entries_count() -> i32 {
if !cfg!(feature = "profiler") {
return 0;
}
let mut result = 0;
for i in 0..valid_tlb_entries_count {
let page = valid_tlb_entries[i as usize];
let entry = tlb_data[page as usize];
if 0 != entry {
result += 1
}
}
return result;
}
#[no_mangle]
pub unsafe fn get_valid_global_tlb_entries_count() -> i32 {
if !cfg!(feature = "profiler") {
return 0;
}
let mut result = 0;
for i in 0..valid_tlb_entries_count {
let page = valid_tlb_entries[i as usize];
let entry = tlb_data[page as usize];
if 0 != entry & TLB_GLOBAL {
result += 1
}
}
return result;
}
#[inline(never)]
pub unsafe fn trigger_np(code: i32) {
dbg_log!("#np");
*instruction_pointer = *previous_ip;
if DEBUG {
if js::cpu_exception_hook(CPU_EXCEPTION_NP) {
return;
}
}
call_interrupt_vector(CPU_EXCEPTION_NP, false, Some(code));
}
#[inline(never)]
pub unsafe fn trigger_ss(code: i32) {
dbg_log!("#ss");
*instruction_pointer = *previous_ip;
if DEBUG {
if js::cpu_exception_hook(CPU_EXCEPTION_SS) {
return;
}
}
call_interrupt_vector(CPU_EXCEPTION_SS, false, Some(code));
}
#[no_mangle]
pub unsafe fn store_current_tsc() { *current_tsc = read_tsc(); }
#[no_mangle]
pub unsafe fn handle_irqs() {
if *flags & FLAG_INTERRUPT != 0 {
if let Some(irq) = pic::pic_acknowledge_irq() {
pic_call_irq(irq)
}
else if *acpi_enabled {
if let Some(irq) = apic::acknowledge_irq() {
pic_call_irq(irq)
}
}
}
}
unsafe fn pic_call_irq(interrupt_nr: u8) {
*previous_ip = *instruction_pointer; // XXX: What if called after instruction (port IO)
if *in_hlt {
js::stop_idling();
*in_hlt = false;
}
call_interrupt_vector(interrupt_nr as i32, false, None);
}
#[no_mangle]
unsafe fn device_raise_irq(i: u8) {
pic::set_irq(i);
if *acpi_enabled {
ioapic::set_irq(i);
}
handle_irqs()
}
#[no_mangle]
unsafe fn device_lower_irq(i: u8) {
pic::clear_irq(i);
if *acpi_enabled {
ioapic::clear_irq(i);
}
handle_irqs()
}
pub fn io_port_read8(port: i32) -> i32 {
unsafe {
match port {
0x20 => pic::port20_read() as i32,
0x21 => pic::port21_read() as i32,
0xA0 => pic::portA0_read() as i32,
0xA1 => pic::portA1_read() as i32,
0x4D0 => pic::port4D0_read() as i32,
0x4D1 => pic::port4D1_read() as i32,
_ => js::io_port_read8(port),
}
}
}
pub fn io_port_read16(port: i32) -> i32 { unsafe { js::io_port_read16(port) } }
pub fn io_port_read32(port: i32) -> i32 { unsafe { js::io_port_read32(port) } }
pub fn io_port_write8(port: i32, value: i32) {
unsafe {
match port {
0x20 | 0x21 | 0xA0 | 0xA1 | 0x4D0 | 0x4D1 => {
match port {
0x20 => pic::port20_write(value as u8),
0x21 => pic::port21_write(value as u8),
0xA0 => pic::portA0_write(value as u8),
0xA1 => pic::portA1_write(value as u8),
0x4D0 => pic::port4D0_write(value as u8),
0x4D1 => pic::port4D1_write(value as u8),
_ => dbg_assert!(false),
};
handle_irqs()
},
_ => js::io_port_write8(port, value),
}
}
}
pub fn io_port_write16(port: i32, value: i32) { unsafe { js::io_port_write16(port, value) } }
pub fn io_port_write32(port: i32, value: i32) { unsafe { js::io_port_write32(port, value) } }
#[no_mangle]
#[cfg(debug_assertions)]
pub unsafe fn check_page_switch(block_addr: u32, next_block_addr: u32) {
let x = translate_address_read_jit(*instruction_pointer);
if x != Ok(next_block_addr) {
dbg_log!(
"page switch from={:x} to={:x} prev_eip={:x} eip={:x} phys_eip={:x}",
block_addr,
next_block_addr,
*previous_ip,
*instruction_pointer,
x.unwrap_or(0),
);
}
dbg_assert!(next_block_addr & 0xFFF == *instruction_pointer as u32 & 0xFFF);
dbg_assert!(x.is_ok());
dbg_assert!(x == Ok(next_block_addr));
}
#[no_mangle]
pub unsafe fn reset_cpu() {
for i in 0..8 {
*segment_is_null.offset(i) = false;
*segment_limits.offset(i) = 0;
*segment_offsets.offset(i) = 0;
*segment_access_bytes.offset(i) = 0x80 | (0 << 5) | 0x10 | 0x02; // P dpl0 S RW
*reg32.offset(i) = 0;
*sreg.offset(i) = 0;
*dreg.offset(i) = 0;
write_xmm128_2(i as i32, 0, 0);
*fpu_st.offset(i) = softfloat::F80::ZERO;
}
*segment_access_bytes.offset(CS as isize) = 0x80 | (0 << 5) | 0x10 | 0x08 | 0x02; // P dpl0 S E RW
for i in 0..4 {
*reg_pdpte.offset(i) = 0
}
*fpu_stack_empty = 0xFF;
*fpu_stack_ptr = 0;
*fpu_control_word = 0x37F;
*fpu_status_word = 0;
*fpu_ip = 0;
*fpu_ip_selector = 0;
*fpu_opcode = 0;
*fpu_dp = 0;
*fpu_dp_selector = 0;
*mxcsr = 0x1F80;
full_clear_tlb();
*protected_mode = false;
// http://www.sandpile.org/x86/initial.htm
*idtr_size = 0;
*idtr_offset = 0;
*gdtr_size = 0;
*gdtr_offset = 0;
*page_fault = false;
*cr = 1 << 30 | 1 << 29 | 1 << 4;
*cr.offset(2) = 0;
*cr.offset(3) = 0;
*cr.offset(4) = 0;
*dreg.offset(6) = 0xFFFF0FF0u32 as i32;
*dreg.offset(7) = 0x400;
*cpl = 0;
*is_32 = false;
*stack_size_32 = false;
*prefixes = 0;
*last_virt_eip = -1;
*instruction_counter = 0;
*previous_ip = 0;
*in_hlt = false;
*sysenter_cs = 0;
*sysenter_esp = 0;
*sysenter_eip = 0;
*flags = FLAGS_DEFAULT;
*flags_changed = 0;
*last_result = 0;
*last_op1 = 0;
*last_op_size = 0;
set_tsc(0, 0);
*instruction_pointer = 0xFFFF0;
switch_cs_real_mode(0xF000);
switch_seg(SS, 0x30);
write_reg32(ESP, 0x100);
update_state_flags();
jit::jit_clear_cache_js();
}
#[no_mangle]
pub unsafe fn set_cpuid_level(level: u32) { cpuid_level = level }