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|
- use cpu::cpu::{
- tlb_data, FLAG_CARRY, FLAG_OVERFLOW, FLAG_SIGN, FLAG_ZERO, TLB_GLOBAL, TLB_HAS_CODE,
- TLB_NO_USER, TLB_READONLY, TLB_VALID,
- };
- use cpu::global_pointers;
- use cpu::memory;
- use jit::JitContext;
- use modrm;
- use modrm::ModrmByte;
- use profiler;
- use regs;
- use wasmgen::wasm_builder::{WasmBuilder, WasmLocal, WasmLocalI64};
- pub fn gen_add_cs_offset(ctx: &mut JitContext) {
- ctx.builder
- .load_fixed_i32(global_pointers::get_seg_offset(regs::CS));
- ctx.builder.add_i32();
- }
- fn gen_get_eip(builder: &mut WasmBuilder) {
- builder.load_fixed_i32(global_pointers::instruction_pointer as u32);
- }
- pub fn gen_set_previous_eip_offset_from_eip(builder: &mut WasmBuilder, n: u32) {
- // previous_ip = instruction_pointer + n
- builder.const_i32(global_pointers::previous_ip as i32);
- gen_get_eip(builder);
- if n != 0 {
- builder.const_i32(n as i32);
- builder.add_i32();
- }
- builder.store_aligned_i32(0);
- }
- pub fn gen_set_eip_to_after_current_instruction(ctx: &mut JitContext) {
- ctx.builder
- .const_i32(global_pointers::instruction_pointer as i32);
- gen_get_eip(ctx.builder);
- ctx.builder.const_i32(!0xFFF);
- ctx.builder.and_i32();
- ctx.builder.const_i32(ctx.cpu.eip as i32 & 0xFFF);
- ctx.builder.or_i32();
- ctx.builder.store_aligned_i32(0);
- }
- pub fn gen_set_previous_eip_offset_from_eip_with_low_bits(
- builder: &mut WasmBuilder,
- low_bits: i32,
- ) {
- // previous_ip = instruction_pointer & ~0xFFF | low_bits;
- builder.const_i32(global_pointers::previous_ip as i32);
- gen_get_eip(builder);
- builder.const_i32(!0xFFF);
- builder.and_i32();
- builder.const_i32(low_bits);
- builder.or_i32();
- builder.store_aligned_i32(0);
- }
- pub fn gen_increment_instruction_pointer(builder: &mut WasmBuilder, n: u32) {
- builder.const_i32(global_pointers::instruction_pointer as i32);
- gen_get_eip(builder);
- builder.const_i32(n as i32);
- builder.add_i32();
- builder.store_aligned_i32(0);
- }
- pub fn gen_relative_jump(builder: &mut WasmBuilder, n: i32) {
- // add n to instruction_pointer (without setting the offset as above)
- builder.const_i32(global_pointers::instruction_pointer as i32);
- gen_get_eip(builder);
- builder.const_i32(n);
- builder.add_i32();
- builder.store_aligned_i32(0);
- }
- pub fn gen_page_switch_check(
- ctx: &mut JitContext,
- next_block_addr: u32,
- last_instruction_addr: u32,
- ) {
- // After switching a page while in jitted code, check if the page mapping still holds
- gen_get_eip(ctx.builder);
- let address_local = ctx.builder.set_new_local();
- gen_get_phys_eip(ctx, &address_local);
- ctx.builder.free_local(address_local);
- ctx.builder.const_i32(next_block_addr as i32);
- ctx.builder.ne_i32();
- ctx.builder.if_void();
- gen_profiler_stat_increment(ctx.builder, profiler::stat::FAILED_PAGE_CHANGE);
- gen_debug_track_jit_exit(ctx.builder, last_instruction_addr);
- ctx.builder.br(ctx.exit_label);
- ctx.builder.block_end();
- }
- pub fn gen_absolute_indirect_jump(ctx: &mut JitContext, new_eip: WasmLocal) {
- ctx.builder
- .const_i32(global_pointers::instruction_pointer as i32);
- ctx.builder.get_local(&new_eip);
- ctx.builder.store_aligned_i32(0);
- gen_get_phys_eip(ctx, &new_eip);
- ctx.builder.free_local(new_eip);
- ctx.builder
- .const_i32(ctx.our_wasm_table_index.to_u16() as i32);
- ctx.builder.const_i32(ctx.state_flags.to_u32() as i32);
- ctx.builder.call_fn3_ret("jit_find_cache_entry_in_page");
- let new_basic_block_index = ctx.builder.tee_new_local();
- ctx.builder.const_i32(0);
- ctx.builder.ge_i32();
- ctx.builder.if_void();
- ctx.builder.get_local(&new_basic_block_index);
- ctx.builder.set_local(ctx.basic_block_index_local);
- ctx.builder.br(ctx.main_loop_label);
- ctx.builder.block_end();
- ctx.builder.free_local(new_basic_block_index);
- }
- pub fn gen_increment_timestamp_counter(builder: &mut WasmBuilder, n: i32) {
- builder.increment_fixed_i32(global_pointers::timestamp_counter as u32, n)
- }
- pub fn gen_get_reg8(ctx: &mut JitContext, r: u32) {
- match r {
- regs::AL | regs::CL | regs::DL | regs::BL => {
- ctx.builder.get_local(&ctx.register_locals[r as usize]);
- ctx.builder.const_i32(0xFF);
- ctx.builder.and_i32();
- },
- regs::AH | regs::CH | regs::DH | regs::BH => {
- ctx.builder
- .get_local(&ctx.register_locals[(r - 4) as usize]);
- ctx.builder.const_i32(8);
- ctx.builder.shr_u_i32();
- ctx.builder.const_i32(0xFF);
- ctx.builder.and_i32();
- },
- _ => assert!(false),
- }
- }
- /// Return a new local referencing one of the 8 bit registers or a direct reference to one of the
- /// register locals. Higher bits might be garbage (suitable for gen_cmp8 etc.). Must be freed with
- /// gen_free_reg8_or_alias.
- pub fn gen_get_reg8_or_alias_to_reg32(ctx: &mut JitContext, r: u32) -> WasmLocal {
- match r {
- regs::AL | regs::CL | regs::DL | regs::BL => ctx.register_locals[r as usize].unsafe_clone(),
- regs::AH | regs::CH | regs::DH | regs::BH => {
- ctx.builder
- .get_local(&ctx.register_locals[(r - 4) as usize]);
- ctx.builder.const_i32(8);
- ctx.builder.shr_u_i32();
- ctx.builder.set_new_local()
- },
- _ => panic!(),
- }
- }
- pub fn gen_free_reg8_or_alias(ctx: &mut JitContext, r: u32, local: WasmLocal) {
- match r {
- regs::AL | regs::CL | regs::DL | regs::BL => {},
- regs::AH | regs::CH | regs::DH | regs::BH => ctx.builder.free_local(local),
- _ => panic!(),
- }
- }
- pub fn gen_get_reg16(ctx: &mut JitContext, r: u32) {
- ctx.builder.get_local(&ctx.register_locals[r as usize]);
- ctx.builder.const_i32(0xFFFF);
- ctx.builder.and_i32();
- }
- pub fn gen_get_reg32(ctx: &mut JitContext, r: u32) {
- ctx.builder.get_local(&ctx.register_locals[r as usize]);
- }
- pub fn gen_set_reg8(ctx: &mut JitContext, r: u32) {
- match r {
- regs::AL | regs::CL | regs::DL | regs::BL => {
- // reg32[r] = stack_value & 0xFF | reg32[r] & ~0xFF
- ctx.builder.const_i32(0xFF);
- ctx.builder.and_i32();
- ctx.builder.get_local(&ctx.register_locals[r as usize]);
- ctx.builder.const_i32(!0xFF);
- ctx.builder.and_i32();
- ctx.builder.or_i32();
- ctx.builder.set_local(&ctx.register_locals[r as usize]);
- },
- regs::AH | regs::CH | regs::DH | regs::BH => {
- // reg32[r] = stack_value << 8 & 0xFF00 | reg32[r] & ~0xFF00
- ctx.builder.const_i32(8);
- ctx.builder.shl_i32();
- ctx.builder.const_i32(0xFF00);
- ctx.builder.and_i32();
- ctx.builder
- .get_local(&ctx.register_locals[(r - 4) as usize]);
- ctx.builder.const_i32(!0xFF00);
- ctx.builder.and_i32();
- ctx.builder.or_i32();
- ctx.builder
- .set_local(&ctx.register_locals[(r - 4) as usize]);
- },
- _ => assert!(false),
- }
- }
- pub fn gen_set_reg16(ctx: &mut JitContext, r: u32) {
- gen_set_reg16_local(ctx.builder, &ctx.register_locals[r as usize]);
- }
- pub fn gen_set_reg16_local(builder: &mut WasmBuilder, local: &WasmLocal) {
- // reg32[r] = v & 0xFFFF | reg32[r] & ~0xFFFF
- builder.const_i32(0xFFFF);
- builder.and_i32();
- builder.get_local(local);
- builder.const_i32(!0xFFFF);
- builder.and_i32();
- builder.or_i32();
- builder.set_local(local);
- }
- pub fn gen_set_reg32(ctx: &mut JitContext, r: u32) {
- ctx.builder.set_local(&ctx.register_locals[r as usize]);
- }
- pub fn decr_exc_asize(ctx: &mut JitContext) {
- gen_get_reg32(ctx, regs::ECX);
- ctx.builder.const_i32(1);
- ctx.builder.sub_i32();
- if ctx.cpu.asize_32() {
- gen_set_reg32(ctx, regs::ECX);
- }
- else {
- gen_set_reg16(ctx, regs::CX);
- }
- }
- pub fn gen_read_reg_xmm128_into_scratch(ctx: &mut JitContext, r: u32) {
- ctx.builder
- .const_i32(global_pointers::sse_scratch_register as i32);
- let dest = global_pointers::get_reg_xmm_offset(r);
- ctx.builder.const_i32(dest as i32);
- ctx.builder.load_aligned_i64(0);
- ctx.builder.store_aligned_i64(0);
- ctx.builder
- .const_i32(global_pointers::sse_scratch_register as i32 + 8);
- let dest = global_pointers::get_reg_xmm_offset(r) + 8;
- ctx.builder.const_i32(dest as i32);
- ctx.builder.load_aligned_i64(0);
- ctx.builder.store_aligned_i64(0);
- }
- pub fn gen_get_sreg(ctx: &mut JitContext, r: u32) {
- ctx.builder
- .load_fixed_u16(global_pointers::get_sreg_offset(r))
- }
- pub fn gen_get_ss_offset(ctx: &mut JitContext) {
- ctx.builder
- .load_fixed_i32(global_pointers::get_seg_offset(regs::SS));
- }
- pub fn gen_get_flags(builder: &mut WasmBuilder) {
- builder.load_fixed_i32(global_pointers::flags as u32);
- }
- pub fn gen_get_flags_changed(builder: &mut WasmBuilder) {
- builder.load_fixed_i32(global_pointers::flags_changed as u32);
- }
- pub fn gen_get_last_result(builder: &mut WasmBuilder) {
- builder.load_fixed_i32(global_pointers::last_result as u32);
- }
- pub fn gen_get_last_op_size(builder: &mut WasmBuilder) {
- builder.load_fixed_i32(global_pointers::last_op_size as u32);
- }
- pub fn gen_get_last_op1(builder: &mut WasmBuilder) {
- builder.load_fixed_i32(global_pointers::last_op1 as u32);
- }
- pub fn gen_get_page_fault(builder: &mut WasmBuilder) {
- builder.load_fixed_u8(global_pointers::page_fault as u32);
- }
- /// sign-extend a byte value on the stack and leave it on the stack
- pub fn sign_extend_i8(builder: &mut WasmBuilder) {
- builder.const_i32(24);
- builder.shl_i32();
- builder.const_i32(24);
- builder.shr_s_i32();
- }
- /// sign-extend a two byte value on the stack and leave it on the stack
- pub fn sign_extend_i16(builder: &mut WasmBuilder) {
- builder.const_i32(16);
- builder.shl_i32();
- builder.const_i32(16);
- builder.shr_s_i32();
- }
- pub fn gen_fn0_const(builder: &mut WasmBuilder, name: &str) { builder.call_fn0(name) }
- pub fn gen_fn1_const(builder: &mut WasmBuilder, name: &str, arg0: u32) {
- builder.const_i32(arg0 as i32);
- builder.call_fn1(name);
- }
- pub fn gen_fn2_const(builder: &mut WasmBuilder, name: &str, arg0: u32, arg1: u32) {
- builder.const_i32(arg0 as i32);
- builder.const_i32(arg1 as i32);
- builder.call_fn2(name);
- }
- pub fn gen_fn3_const(builder: &mut WasmBuilder, name: &str, arg0: u32, arg1: u32, arg2: u32) {
- builder.const_i32(arg0 as i32);
- builder.const_i32(arg1 as i32);
- builder.const_i32(arg2 as i32);
- builder.call_fn3(name);
- }
- // helper functions for gen/generate_jit.js
- pub fn gen_modrm_fn0(builder: &mut WasmBuilder, name: &str) {
- // generates: fn( _ )
- builder.call_fn1(name);
- }
- pub fn gen_modrm_fn1(builder: &mut WasmBuilder, name: &str, arg0: u32) {
- // generates: fn( _, arg0 )
- builder.const_i32(arg0 as i32);
- builder.call_fn2(name);
- }
- pub fn gen_modrm_fn2(builder: &mut WasmBuilder, name: &str, arg0: u32, arg1: u32) {
- // generates: fn( _, arg0, arg1 )
- builder.const_i32(arg0 as i32);
- builder.const_i32(arg1 as i32);
- builder.call_fn3(name);
- }
- pub fn gen_modrm_resolve(ctx: &mut JitContext, modrm_byte: ModrmByte) {
- modrm::gen(ctx, modrm_byte)
- }
- pub fn gen_set_reg8_r(ctx: &mut JitContext, dest: u32, src: u32) {
- // generates: reg8[r_dest] = reg8[r_src]
- gen_get_reg8(ctx, src);
- gen_set_reg8(ctx, dest);
- }
- pub fn gen_set_reg16_r(ctx: &mut JitContext, dest: u32, src: u32) {
- // generates: reg16[r_dest] = reg16[r_src]
- gen_get_reg16(ctx, src);
- gen_set_reg16(ctx, dest);
- }
- pub fn gen_set_reg32_r(ctx: &mut JitContext, dest: u32, src: u32) {
- // generates: reg32[r_dest] = reg32[r_src]
- gen_get_reg32(ctx, src);
- gen_set_reg32(ctx, dest);
- }
- pub fn gen_modrm_resolve_safe_read8(ctx: &mut JitContext, modrm_byte: ModrmByte) {
- gen_modrm_resolve(ctx, modrm_byte);
- let address_local = ctx.builder.set_new_local();
- gen_safe_read8(ctx, &address_local);
- ctx.builder.free_local(address_local);
- }
- pub fn gen_modrm_resolve_safe_read16(ctx: &mut JitContext, modrm_byte: ModrmByte) {
- gen_modrm_resolve(ctx, modrm_byte);
- let address_local = ctx.builder.set_new_local();
- gen_safe_read16(ctx, &address_local);
- ctx.builder.free_local(address_local);
- }
- pub fn gen_modrm_resolve_safe_read32(ctx: &mut JitContext, modrm_byte: ModrmByte) {
- gen_modrm_resolve(ctx, modrm_byte);
- let address_local = ctx.builder.set_new_local();
- gen_safe_read32(ctx, &address_local);
- ctx.builder.free_local(address_local);
- }
- pub fn gen_modrm_resolve_safe_read64(ctx: &mut JitContext, modrm_byte: ModrmByte) {
- gen_modrm_resolve(ctx, modrm_byte);
- let address_local = ctx.builder.set_new_local();
- gen_safe_read64(ctx, &address_local);
- ctx.builder.free_local(address_local);
- }
- pub fn gen_modrm_resolve_safe_read128(
- ctx: &mut JitContext,
- modrm_byte: ModrmByte,
- where_to_write: u32,
- ) {
- gen_modrm_resolve(ctx, modrm_byte);
- let address_local = ctx.builder.set_new_local();
- gen_safe_read128(ctx, &address_local, where_to_write);
- ctx.builder.free_local(address_local);
- }
- pub fn gen_safe_read8(ctx: &mut JitContext, address_local: &WasmLocal) {
- gen_safe_read(ctx, BitSize::BYTE, address_local, None);
- }
- pub fn gen_safe_read16(ctx: &mut JitContext, address_local: &WasmLocal) {
- gen_safe_read(ctx, BitSize::WORD, address_local, None);
- }
- pub fn gen_safe_read32(ctx: &mut JitContext, address_local: &WasmLocal) {
- gen_safe_read(ctx, BitSize::DWORD, address_local, None);
- }
- pub fn gen_safe_read64(ctx: &mut JitContext, address_local: &WasmLocal) {
- gen_safe_read(ctx, BitSize::QWORD, &address_local, None);
- }
- pub fn gen_safe_read128(ctx: &mut JitContext, address_local: &WasmLocal, where_to_write: u32) {
- gen_safe_read(ctx, BitSize::DQWORD, &address_local, Some(where_to_write));
- }
- // only used internally for gen_safe_write
- enum GenSafeWriteValue<'a> {
- I32(&'a WasmLocal),
- I64(&'a WasmLocalI64),
- TwoI64s(&'a WasmLocalI64, &'a WasmLocalI64),
- }
- enum GenSafeReadWriteValue {
- I32(WasmLocal),
- I64(WasmLocalI64),
- }
- #[derive(Copy, Clone, Eq, PartialEq)]
- pub enum BitSize {
- BYTE,
- WORD,
- DWORD,
- QWORD,
- DQWORD,
- }
- impl BitSize {
- pub fn bytes(&self) -> u32 {
- match self {
- BitSize::BYTE => 1,
- BitSize::WORD => 2,
- BitSize::DWORD => 4,
- BitSize::QWORD => 8,
- BitSize::DQWORD => 16,
- }
- }
- }
- pub fn gen_safe_write8(ctx: &mut JitContext, address_local: &WasmLocal, value_local: &WasmLocal) {
- gen_safe_write(
- ctx,
- BitSize::BYTE,
- address_local,
- GenSafeWriteValue::I32(value_local),
- )
- }
- pub fn gen_safe_write16(ctx: &mut JitContext, address_local: &WasmLocal, value_local: &WasmLocal) {
- gen_safe_write(
- ctx,
- BitSize::WORD,
- address_local,
- GenSafeWriteValue::I32(value_local),
- )
- }
- pub fn gen_safe_write32(ctx: &mut JitContext, address_local: &WasmLocal, value_local: &WasmLocal) {
- gen_safe_write(
- ctx,
- BitSize::DWORD,
- address_local,
- GenSafeWriteValue::I32(value_local),
- )
- }
- pub fn gen_safe_write64(
- ctx: &mut JitContext,
- address_local: &WasmLocal,
- value_local: &WasmLocalI64,
- ) {
- gen_safe_write(
- ctx,
- BitSize::QWORD,
- address_local,
- GenSafeWriteValue::I64(value_local),
- )
- }
- pub fn gen_safe_write128(
- ctx: &mut JitContext,
- address_local: &WasmLocal,
- value_local_low: &WasmLocalI64,
- value_local_high: &WasmLocalI64,
- ) {
- gen_safe_write(
- ctx,
- BitSize::DQWORD,
- address_local,
- GenSafeWriteValue::TwoI64s(value_local_low, value_local_high),
- )
- }
- fn gen_safe_read(
- ctx: &mut JitContext,
- bits: BitSize,
- address_local: &WasmLocal,
- where_to_write: Option<u32>,
- ) {
- // Execute a virtual memory read. All slow paths (memory-mapped IO, tlb miss, page fault and
- // read across page boundary are handled in safe_read_jit_slow
- // entry <- tlb_data[addr >> 12 << 2]
- // if entry & MASK == TLB_VALID && (addr & 0xFFF) <= 0x1000 - bytes: goto fast
- // entry <- safe_read_jit_slow(addr, instruction_pointer)
- // if page_fault: goto exit-with-pagefault
- // fast: mem[(entry & ~0xFFF) ^ addr]
- let cont = ctx.builder.block_void();
- ctx.builder.get_local(&address_local);
- ctx.builder.const_i32(12);
- ctx.builder.shr_u_i32();
- ctx.builder.const_i32(2);
- ctx.builder.shl_i32();
- ctx.builder
- .load_aligned_i32(unsafe { &tlb_data[0] as *const i32 as u32 });
- let entry_local = ctx.builder.tee_new_local();
- ctx.builder.const_i32(
- (0xFFF
- & !TLB_READONLY
- & !TLB_GLOBAL
- & !TLB_HAS_CODE
- & !(if ctx.cpu.cpl3() { 0 } else { TLB_NO_USER })) as i32,
- );
- ctx.builder.and_i32();
- ctx.builder.const_i32(TLB_VALID as i32);
- ctx.builder.eq_i32();
- if bits != BitSize::BYTE {
- ctx.builder.get_local(&address_local);
- ctx.builder.const_i32(0xFFF);
- ctx.builder.and_i32();
- ctx.builder.const_i32(0x1000 - bits.bytes() as i32);
- ctx.builder.le_i32();
- ctx.builder.and_i32();
- }
- ctx.builder.br_if(cont);
- if cfg!(feature = "profiler") {
- ctx.builder.get_local(&address_local);
- ctx.builder.get_local(&entry_local);
- ctx.builder.call_fn2("report_safe_read_jit_slow");
- }
- ctx.builder.get_local(&address_local);
- ctx.builder
- .const_i32(ctx.start_of_current_instruction as i32 & 0xFFF);
- match bits {
- BitSize::BYTE => {
- ctx.builder.call_fn2_ret("safe_read8_slow_jit");
- },
- BitSize::WORD => {
- ctx.builder.call_fn2_ret("safe_read16_slow_jit");
- },
- BitSize::DWORD => {
- ctx.builder.call_fn2_ret("safe_read32s_slow_jit");
- },
- BitSize::QWORD => {
- ctx.builder.call_fn2_ret("safe_read64s_slow_jit");
- },
- BitSize::DQWORD => {
- ctx.builder.call_fn2_ret("safe_read128s_slow_jit");
- },
- }
- ctx.builder.tee_local(&entry_local);
- ctx.builder.const_i32(1);
- ctx.builder.and_i32();
- if cfg!(feature = "profiler") {
- ctx.builder.if_void();
- gen_debug_track_jit_exit(ctx.builder, ctx.start_of_current_instruction);
- ctx.builder.block_end();
- ctx.builder.get_local(&entry_local);
- ctx.builder.const_i32(1);
- ctx.builder.and_i32();
- }
- ctx.builder.br_if(ctx.exit_with_fault_label);
- ctx.builder.block_end();
- gen_profiler_stat_increment(ctx.builder, profiler::stat::SAFE_READ_FAST); // XXX: Both fast and slow
- ctx.builder.get_local(&entry_local);
- ctx.builder.const_i32(!0xFFF);
- ctx.builder.and_i32();
- ctx.builder.get_local(&address_local);
- ctx.builder.xor_i32();
- // where_to_write is only used by dqword
- dbg_assert!((where_to_write != None) == (bits == BitSize::DQWORD));
- ctx.builder.const_i32(unsafe { memory::mem8 } as i32);
- ctx.builder.add_i32();
- match bits {
- BitSize::BYTE => {
- ctx.builder.load_u8(0);
- },
- BitSize::WORD => {
- ctx.builder.load_unaligned_u16(0);
- },
- BitSize::DWORD => {
- ctx.builder.load_unaligned_i32(0);
- },
- BitSize::QWORD => {
- ctx.builder.load_unaligned_i64(0);
- },
- BitSize::DQWORD => {
- let where_to_write = where_to_write.unwrap();
- let virt_address_local = ctx.builder.set_new_local();
- ctx.builder.const_i32(0);
- ctx.builder.get_local(&virt_address_local);
- ctx.builder.load_unaligned_i64(0);
- ctx.builder.store_unaligned_i64(where_to_write);
- ctx.builder.const_i32(0);
- ctx.builder.get_local(&virt_address_local);
- ctx.builder.load_unaligned_i64(8);
- ctx.builder.store_unaligned_i64(where_to_write + 8);
- ctx.builder.free_local(virt_address_local);
- },
- }
- ctx.builder.free_local(entry_local);
- }
- pub fn gen_get_phys_eip(ctx: &mut JitContext, address_local: &WasmLocal) {
- // Similar to gen_safe_read, but return the physical eip rather than reading from memory
- // Does not (need to) handle mapped memory
- // XXX: Currently does not use ctx.start_of_current_instruction, but rather assumes that eip is
- // already correct (pointing at the current instruction)
- let cont = ctx.builder.block_void();
- ctx.builder.get_local(&address_local);
- ctx.builder.const_i32(12);
- ctx.builder.shr_u_i32();
- ctx.builder.const_i32(2);
- ctx.builder.shl_i32();
- ctx.builder
- .load_aligned_i32(unsafe { &tlb_data[0] as *const i32 as u32 });
- let entry_local = ctx.builder.tee_new_local();
- ctx.builder.const_i32(
- (0xFFF
- & !TLB_READONLY
- & !TLB_GLOBAL
- & !TLB_HAS_CODE
- & !(if ctx.cpu.cpl3() { 0 } else { TLB_NO_USER })) as i32,
- );
- ctx.builder.and_i32();
- ctx.builder.const_i32(TLB_VALID as i32);
- ctx.builder.eq_i32();
- ctx.builder.br_if(cont);
- if cfg!(feature = "profiler") {
- ctx.builder.get_local(&address_local);
- ctx.builder.get_local(&entry_local);
- ctx.builder.call_fn2("report_safe_read_jit_slow");
- }
- ctx.builder.get_local(&address_local);
- ctx.builder.call_fn1_ret("get_phys_eip_slow_jit");
- ctx.builder.tee_local(&entry_local);
- ctx.builder.const_i32(1);
- ctx.builder.and_i32();
- if cfg!(feature = "profiler") {
- ctx.builder.if_void();
- gen_debug_track_jit_exit(ctx.builder, ctx.start_of_current_instruction); // XXX
- ctx.builder.block_end();
- ctx.builder.get_local(&entry_local);
- ctx.builder.const_i32(1);
- ctx.builder.and_i32();
- }
- ctx.builder.br_if(ctx.exit_with_fault_label);
- ctx.builder.block_end();
- gen_profiler_stat_increment(ctx.builder, profiler::stat::SAFE_READ_FAST); // XXX: Both fast and slow
- ctx.builder.get_local(&entry_local);
- ctx.builder.const_i32(!0xFFF);
- ctx.builder.and_i32();
- ctx.builder.get_local(&address_local);
- ctx.builder.xor_i32();
- ctx.builder.free_local(entry_local);
- }
- fn gen_safe_write(
- ctx: &mut JitContext,
- bits: BitSize,
- address_local: &WasmLocal,
- value_local: GenSafeWriteValue,
- ) {
- // Execute a virtual memory write. All slow paths (memory-mapped IO, tlb miss, page fault,
- // write across page boundary and page containing jitted code are handled in safe_write_jit_slow
- // entry <- tlb_data[addr >> 12 << 2]
- // if entry & MASK == TLB_VALID && (addr & 0xFFF) <= 0x1000 - bytes: goto fast
- // entry <- safe_write_jit_slow(addr, value, instruction_pointer)
- // if page_fault: goto exit-with-pagefault
- // fast: mem[(entry & ~0xFFF) ^ addr] <- value
- let cont = ctx.builder.block_void();
- ctx.builder.get_local(&address_local);
- ctx.builder.const_i32(12);
- ctx.builder.shr_u_i32();
- ctx.builder.const_i32(2);
- ctx.builder.shl_i32();
- ctx.builder
- .load_aligned_i32(unsafe { &tlb_data[0] as *const i32 as u32 });
- let entry_local = ctx.builder.tee_new_local();
- ctx.builder
- .const_i32((0xFFF & !TLB_GLOBAL & !(if ctx.cpu.cpl3() { 0 } else { TLB_NO_USER })) as i32);
- ctx.builder.and_i32();
- ctx.builder.const_i32(TLB_VALID as i32);
- ctx.builder.eq_i32();
- if bits != BitSize::BYTE {
- ctx.builder.get_local(&address_local);
- ctx.builder.const_i32(0xFFF);
- ctx.builder.and_i32();
- ctx.builder.const_i32(0x1000 - bits.bytes() as i32);
- ctx.builder.le_i32();
- ctx.builder.and_i32();
- }
- ctx.builder.br_if(cont);
- if cfg!(feature = "profiler") {
- ctx.builder.get_local(&address_local);
- ctx.builder.get_local(&entry_local);
- ctx.builder.call_fn2("report_safe_write_jit_slow");
- }
- ctx.builder.get_local(&address_local);
- match value_local {
- GenSafeWriteValue::I32(local) => ctx.builder.get_local(local),
- GenSafeWriteValue::I64(local) => ctx.builder.get_local_i64(local),
- GenSafeWriteValue::TwoI64s(local1, local2) => {
- ctx.builder.get_local_i64(local1);
- ctx.builder.get_local_i64(local2)
- },
- }
- ctx.builder
- .const_i32(ctx.start_of_current_instruction as i32 & 0xFFF);
- match bits {
- BitSize::BYTE => {
- ctx.builder.call_fn3_ret("safe_write8_slow_jit");
- },
- BitSize::WORD => {
- ctx.builder.call_fn3_ret("safe_write16_slow_jit");
- },
- BitSize::DWORD => {
- ctx.builder.call_fn3_ret("safe_write32_slow_jit");
- },
- BitSize::QWORD => {
- ctx.builder
- .call_fn3_i32_i64_i32_ret("safe_write64_slow_jit");
- },
- BitSize::DQWORD => {
- ctx.builder
- .call_fn4_i32_i64_i64_i32_ret("safe_write128_slow_jit");
- },
- }
- ctx.builder.tee_local(&entry_local);
- ctx.builder.const_i32(1);
- ctx.builder.and_i32();
- if cfg!(feature = "profiler") {
- ctx.builder.if_void();
- gen_debug_track_jit_exit(ctx.builder, ctx.start_of_current_instruction);
- ctx.builder.block_end();
- ctx.builder.get_local(&entry_local);
- ctx.builder.const_i32(1);
- ctx.builder.and_i32();
- }
- ctx.builder.br_if(ctx.exit_with_fault_label);
- ctx.builder.block_end();
- gen_profiler_stat_increment(ctx.builder, profiler::stat::SAFE_WRITE_FAST); // XXX: Both fast and slow
- ctx.builder.get_local(&entry_local);
- ctx.builder.const_i32(!0xFFF);
- ctx.builder.and_i32();
- ctx.builder.get_local(&address_local);
- ctx.builder.xor_i32();
- ctx.builder.const_i32(unsafe { memory::mem8 } as i32);
- ctx.builder.add_i32();
- match value_local {
- GenSafeWriteValue::I32(local) => ctx.builder.get_local(local),
- GenSafeWriteValue::I64(local) => ctx.builder.get_local_i64(local),
- GenSafeWriteValue::TwoI64s(local1, local2) => {
- assert!(bits == BitSize::DQWORD);
- let virt_address_local = ctx.builder.tee_new_local();
- ctx.builder.get_local_i64(local1);
- ctx.builder.store_unaligned_i64(0);
- ctx.builder.get_local(&virt_address_local);
- ctx.builder.get_local_i64(local2);
- ctx.builder.store_unaligned_i64(8);
- ctx.builder.free_local(virt_address_local);
- },
- }
- match bits {
- BitSize::BYTE => {
- ctx.builder.store_u8(0);
- },
- BitSize::WORD => {
- ctx.builder.store_unaligned_u16(0);
- },
- BitSize::DWORD => {
- ctx.builder.store_unaligned_i32(0);
- },
- BitSize::QWORD => {
- ctx.builder.store_unaligned_i64(0);
- },
- BitSize::DQWORD => {}, // handled above
- }
- ctx.builder.free_local(entry_local);
- }
- pub fn gen_safe_read_write(
- ctx: &mut JitContext,
- bits: BitSize,
- address_local: &WasmLocal,
- f: &dyn Fn(&mut JitContext),
- ) {
- // Execute a virtual memory read+write. All slow paths (memory-mapped IO, tlb miss, page fault,
- // write across page boundary and page containing jitted code are handled in
- // safe_read_write_jit_slow
- // entry <- tlb_data[addr >> 12 << 2]
- // can_use_fast_path <- entry & MASK == TLB_VALID && (addr & 0xFFF) <= 0x1000 - bytes
- // if can_use_fast_path: goto fast
- // entry <- safe_read_write_jit_slow(addr, instruction_pointer)
- // if page_fault: goto exit-with-pagefault
- // fast: value <- f(mem[(entry & ~0xFFF) ^ addr])
- // if !can_use_fast_path { safe_write_jit_slow(addr, value, instruction_pointer) }
- // mem[(entry & ~0xFFF) ^ addr] <- value
- let cont = ctx.builder.block_void();
- ctx.builder.get_local(address_local);
- ctx.builder.const_i32(12);
- ctx.builder.shr_u_i32();
- ctx.builder.const_i32(2);
- ctx.builder.shl_i32();
- ctx.builder
- .load_aligned_i32(unsafe { &tlb_data[0] as *const i32 as u32 });
- let entry_local = ctx.builder.tee_new_local();
- ctx.builder
- .const_i32((0xFFF & !TLB_GLOBAL & !(if ctx.cpu.cpl3() { 0 } else { TLB_NO_USER })) as i32);
- ctx.builder.and_i32();
- ctx.builder.const_i32(TLB_VALID as i32);
- ctx.builder.eq_i32();
- if bits != BitSize::BYTE {
- ctx.builder.get_local(&address_local);
- ctx.builder.const_i32(0xFFF);
- ctx.builder.and_i32();
- ctx.builder.const_i32(0x1000 - bits.bytes() as i32);
- ctx.builder.le_i32();
- ctx.builder.and_i32();
- }
- let can_use_fast_path_local = ctx.builder.tee_new_local();
- ctx.builder.br_if(cont);
- if cfg!(feature = "profiler") {
- ctx.builder.get_local(&address_local);
- ctx.builder.get_local(&entry_local);
- ctx.builder.call_fn2("report_safe_read_write_jit_slow");
- }
- ctx.builder.get_local(&address_local);
- ctx.builder
- .const_i32(ctx.start_of_current_instruction as i32 & 0xFFF);
- match bits {
- BitSize::BYTE => {
- ctx.builder.call_fn2_ret("safe_read_write8_slow_jit");
- },
- BitSize::WORD => {
- ctx.builder.call_fn2_ret("safe_read_write16_slow_jit");
- },
- BitSize::DWORD => {
- ctx.builder.call_fn2_ret("safe_read_write32s_slow_jit");
- },
- BitSize::QWORD => {
- ctx.builder.call_fn2_ret("safe_read_write64_slow_jit");
- },
- BitSize::DQWORD => dbg_assert!(false),
- }
- ctx.builder.tee_local(&entry_local);
- ctx.builder.const_i32(1);
- ctx.builder.and_i32();
- if cfg!(feature = "profiler") {
- ctx.builder.if_void();
- gen_debug_track_jit_exit(ctx.builder, ctx.start_of_current_instruction);
- ctx.builder.block_end();
- ctx.builder.get_local(&entry_local);
- ctx.builder.const_i32(1);
- ctx.builder.and_i32();
- }
- ctx.builder.br_if(ctx.exit_with_fault_label);
- ctx.builder.block_end();
- gen_profiler_stat_increment(ctx.builder, profiler::stat::SAFE_READ_WRITE_FAST); // XXX: Also slow
- ctx.builder.get_local(&entry_local);
- ctx.builder.const_i32(!0xFFF);
- ctx.builder.and_i32();
- ctx.builder.get_local(&address_local);
- ctx.builder.xor_i32();
- ctx.builder.const_i32(unsafe { memory::mem8 } as i32);
- ctx.builder.add_i32();
- ctx.builder.free_local(entry_local);
- let phys_addr_local = ctx.builder.tee_new_local();
- match bits {
- BitSize::BYTE => {
- ctx.builder.load_u8(0);
- },
- BitSize::WORD => {
- ctx.builder.load_unaligned_u16(0);
- },
- BitSize::DWORD => {
- ctx.builder.load_unaligned_i32(0);
- },
- BitSize::QWORD => {
- ctx.builder.load_unaligned_i64(0);
- },
- BitSize::DQWORD => assert!(false), // not used
- }
- // value is now on stack
- f(ctx);
- // TODO: Could get rid of this local by returning one from f
- let value_local = if bits == BitSize::QWORD {
- GenSafeReadWriteValue::I64(ctx.builder.set_new_local_i64())
- }
- else {
- GenSafeReadWriteValue::I32(ctx.builder.set_new_local())
- };
- ctx.builder.get_local(&can_use_fast_path_local);
- ctx.builder.eqz_i32();
- ctx.builder.if_void();
- {
- ctx.builder.get_local(&address_local);
- match &value_local {
- GenSafeReadWriteValue::I32(l) => ctx.builder.get_local(l),
- GenSafeReadWriteValue::I64(l) => ctx.builder.get_local_i64(l),
- }
- ctx.builder
- .const_i32(ctx.start_of_current_instruction as i32);
- match bits {
- BitSize::BYTE => {
- ctx.builder.call_fn3_ret("safe_write8_slow_jit");
- },
- BitSize::WORD => {
- ctx.builder.call_fn3_ret("safe_write16_slow_jit");
- },
- BitSize::DWORD => {
- ctx.builder.call_fn3_ret("safe_write32_slow_jit");
- },
- BitSize::QWORD => {
- ctx.builder
- .call_fn3_i32_i64_i32_ret("safe_write64_slow_jit");
- },
- BitSize::DQWORD => dbg_assert!(false),
- }
- ctx.builder.const_i32(1);
- ctx.builder.and_i32();
- ctx.builder.if_void();
- {
- // handled above
- if cfg!(debug_assertions) {
- ctx.builder.const_i32(match bits {
- BitSize::BYTE => 8,
- BitSize::WORD => 16,
- BitSize::DWORD => 32,
- BitSize::QWORD => 64,
- _ => {
- dbg_assert!(false);
- 0
- },
- });
- ctx.builder.get_local(&address_local);
- ctx.builder.call_fn2("bug_gen_safe_read_write_page_fault");
- }
- else {
- ctx.builder.unreachable();
- }
- }
- ctx.builder.block_end();
- }
- ctx.builder.block_end();
- ctx.builder.get_local(&phys_addr_local);
- match &value_local {
- GenSafeReadWriteValue::I32(l) => ctx.builder.get_local(l),
- GenSafeReadWriteValue::I64(l) => ctx.builder.get_local_i64(l),
- }
- match bits {
- BitSize::BYTE => {
- ctx.builder.store_u8(0);
- },
- BitSize::WORD => {
- ctx.builder.store_unaligned_u16(0);
- },
- BitSize::DWORD => {
- ctx.builder.store_unaligned_i32(0);
- },
- BitSize::QWORD => {
- ctx.builder.store_unaligned_i64(0);
- },
- BitSize::DQWORD => dbg_assert!(false),
- }
- match value_local {
- GenSafeReadWriteValue::I32(l) => ctx.builder.free_local(l),
- GenSafeReadWriteValue::I64(l) => ctx.builder.free_local_i64(l),
- }
- ctx.builder.free_local(can_use_fast_path_local);
- ctx.builder.free_local(phys_addr_local);
- }
- #[cfg(debug_assertions)]
- #[no_mangle]
- pub fn bug_gen_safe_read_write_page_fault(bits: i32, addr: u32) {
- dbg_log!("bug: gen_safe_read_write_page_fault {} {:x}", bits, addr);
- dbg_assert!(false);
- }
- pub fn gen_jmp_rel16(builder: &mut WasmBuilder, rel16: u16) {
- let cs_offset_addr = global_pointers::get_seg_offset(regs::CS);
- builder.load_fixed_i32(cs_offset_addr);
- let local = builder.set_new_local();
- // generate:
- // *instruction_pointer = cs_offset + ((*instruction_pointer - cs_offset + rel16) & 0xFFFF);
- {
- builder.const_i32(global_pointers::instruction_pointer as i32);
- gen_get_eip(builder);
- builder.get_local(&local);
- builder.sub_i32();
- builder.const_i32(rel16 as i32);
- builder.add_i32();
- builder.const_i32(0xFFFF);
- builder.and_i32();
- builder.get_local(&local);
- builder.add_i32();
- builder.store_aligned_i32(0);
- }
- builder.free_local(local);
- }
- pub fn gen_pop16_ss16(ctx: &mut JitContext) {
- // sp = segment_offsets[SS] + reg16[SP] (or just reg16[SP] if has_flat_segmentation)
- gen_get_reg16(ctx, regs::SP);
- if !ctx.cpu.has_flat_segmentation() {
- gen_get_ss_offset(ctx);
- ctx.builder.add_i32();
- }
- // result = safe_read16(sp)
- let address_local = ctx.builder.set_new_local();
- gen_safe_read16(ctx, &address_local);
- ctx.builder.free_local(address_local);
- // reg16[SP] += 2;
- gen_get_reg16(ctx, regs::SP);
- ctx.builder.const_i32(2);
- ctx.builder.add_i32();
- gen_set_reg16(ctx, regs::SP);
- // return value is already on stack
- }
- pub fn gen_pop16_ss32(ctx: &mut JitContext) {
- // esp = segment_offsets[SS] + reg32[ESP] (or just reg32[ESP] if has_flat_segmentation)
- gen_get_reg32(ctx, regs::ESP);
- if !ctx.cpu.has_flat_segmentation() {
- gen_get_ss_offset(ctx);
- ctx.builder.add_i32();
- }
- // result = safe_read16(esp)
- let address_local = ctx.builder.set_new_local();
- gen_safe_read16(ctx, &address_local);
- ctx.builder.free_local(address_local);
- // reg32[ESP] += 2;
- gen_get_reg32(ctx, regs::ESP);
- ctx.builder.const_i32(2);
- ctx.builder.add_i32();
- gen_set_reg32(ctx, regs::ESP);
- // return value is already on stack
- }
- pub fn gen_pop16(ctx: &mut JitContext) {
- if ctx.cpu.ssize_32() {
- gen_pop16_ss32(ctx);
- }
- else {
- gen_pop16_ss16(ctx);
- }
- }
- pub fn gen_pop32s_ss16(ctx: &mut JitContext) {
- // sp = reg16[SP]
- gen_get_reg16(ctx, regs::SP);
- // result = safe_read32s(segment_offsets[SS] + sp) (or just sp if has_flat_segmentation)
- if !ctx.cpu.has_flat_segmentation() {
- gen_get_ss_offset(ctx);
- ctx.builder.add_i32();
- }
- let address_local = ctx.builder.set_new_local();
- gen_safe_read32(ctx, &address_local);
- ctx.builder.free_local(address_local);
- // reg16[SP] = sp + 4;
- gen_get_reg16(ctx, regs::SP);
- ctx.builder.const_i32(4);
- ctx.builder.add_i32();
- gen_set_reg16(ctx, regs::SP);
- // return value is already on stack
- }
- pub fn gen_pop32s_ss32(ctx: &mut JitContext) {
- if !ctx.cpu.has_flat_segmentation() {
- gen_get_reg32(ctx, regs::ESP);
- gen_get_ss_offset(ctx);
- ctx.builder.add_i32();
- let address_local = ctx.builder.set_new_local();
- gen_safe_read32(ctx, &address_local);
- ctx.builder.free_local(address_local);
- }
- else {
- let reg = ctx.register_locals[regs::ESP as usize].unsafe_clone();
- gen_safe_read32(ctx, ®);
- }
- gen_get_reg32(ctx, regs::ESP);
- ctx.builder.const_i32(4);
- ctx.builder.add_i32();
- gen_set_reg32(ctx, regs::ESP);
- // return value is already on stack
- }
- pub fn gen_pop32s(ctx: &mut JitContext) {
- if ctx.cpu.ssize_32() {
- gen_pop32s_ss32(ctx);
- }
- else {
- gen_pop32s_ss16(ctx);
- }
- }
- pub fn gen_adjust_stack_reg(ctx: &mut JitContext, offset: u32) {
- if ctx.cpu.ssize_32() {
- gen_get_reg32(ctx, regs::ESP);
- ctx.builder.const_i32(offset as i32);
- ctx.builder.add_i32();
- gen_set_reg32(ctx, regs::ESP);
- }
- else {
- gen_get_reg16(ctx, regs::SP);
- ctx.builder.const_i32(offset as i32);
- ctx.builder.add_i32();
- gen_set_reg16(ctx, regs::SP);
- }
- }
- pub fn gen_leave(ctx: &mut JitContext, os32: bool) {
- // [e]bp = safe_read{16,32}([e]bp)
- if ctx.cpu.ssize_32() {
- gen_get_reg32(ctx, regs::EBP);
- }
- else {
- gen_get_reg16(ctx, regs::BP);
- }
- let old_vbp = ctx.builder.tee_new_local();
- if !ctx.cpu.has_flat_segmentation() {
- gen_get_ss_offset(ctx);
- ctx.builder.add_i32();
- }
- if os32 {
- let address_local = ctx.builder.set_new_local();
- gen_safe_read32(ctx, &address_local);
- ctx.builder.free_local(address_local);
- gen_set_reg32(ctx, regs::EBP);
- }
- else {
- let address_local = ctx.builder.set_new_local();
- gen_safe_read16(ctx, &address_local);
- ctx.builder.free_local(address_local);
- gen_set_reg16(ctx, regs::BP);
- }
- // [e]sp = [e]bp + (os32 ? 4 : 2)
- if ctx.cpu.ssize_32() {
- ctx.builder.get_local(&old_vbp);
- ctx.builder.const_i32(if os32 { 4 } else { 2 });
- ctx.builder.add_i32();
- gen_set_reg32(ctx, regs::ESP);
- }
- else {
- ctx.builder.get_local(&old_vbp);
- ctx.builder.const_i32(if os32 { 4 } else { 2 });
- ctx.builder.add_i32();
- gen_set_reg16(ctx, regs::SP);
- }
- ctx.builder.free_local(old_vbp);
- }
- pub fn gen_task_switch_test(ctx: &mut JitContext) {
- // generate if(cr[0] & (CR0_EM | CR0_TS)) { task_switch_test_jit(); goto exit_with_fault; }
- let cr0_offset = global_pointers::get_creg_offset(0);
- dbg_assert!(regs::CR0_EM | regs::CR0_TS <= 0xFF);
- ctx.builder.load_fixed_u8(cr0_offset);
- ctx.builder.const_i32((regs::CR0_EM | regs::CR0_TS) as i32);
- ctx.builder.and_i32();
- ctx.builder.if_void();
- {
- gen_debug_track_jit_exit(ctx.builder, ctx.start_of_current_instruction);
- gen_fn1_const(
- ctx.builder,
- "task_switch_test_jit",
- ctx.start_of_current_instruction,
- );
- ctx.builder.br(ctx.exit_with_fault_label);
- }
- ctx.builder.block_end();
- }
- pub fn gen_task_switch_test_mmx(ctx: &mut JitContext) {
- // generate if(cr[0] & (CR0_EM | CR0_TS)) { task_switch_test_mmx_jit(); goto exit_with_fault; }
- let cr0_offset = global_pointers::get_creg_offset(0);
- dbg_assert!(regs::CR0_EM | regs::CR0_TS <= 0xFF);
- ctx.builder.load_fixed_u8(cr0_offset);
- ctx.builder.const_i32((regs::CR0_EM | regs::CR0_TS) as i32);
- ctx.builder.and_i32();
- ctx.builder.if_void();
- {
- gen_debug_track_jit_exit(ctx.builder, ctx.start_of_current_instruction);
- gen_fn1_const(
- ctx.builder,
- "task_switch_test_mmx_jit",
- ctx.start_of_current_instruction,
- );
- ctx.builder.br(ctx.exit_with_fault_label);
- }
- ctx.builder.block_end();
- }
- pub fn gen_push16(ctx: &mut JitContext, value_local: &WasmLocal) {
- if ctx.cpu.ssize_32() {
- gen_get_reg32(ctx, regs::ESP);
- }
- else {
- gen_get_reg16(ctx, regs::SP);
- };
- ctx.builder.const_i32(2);
- ctx.builder.sub_i32();
- let reg_updated_local = if !ctx.cpu.ssize_32() || !ctx.cpu.has_flat_segmentation() {
- let reg_updated_local = ctx.builder.tee_new_local();
- if !ctx.cpu.ssize_32() {
- ctx.builder.const_i32(0xFFFF);
- ctx.builder.and_i32();
- }
- if !ctx.cpu.has_flat_segmentation() {
- gen_get_ss_offset(ctx);
- ctx.builder.add_i32();
- }
- let sp_local = ctx.builder.set_new_local();
- gen_safe_write16(ctx, &sp_local, &value_local);
- ctx.builder.free_local(sp_local);
- ctx.builder.get_local(®_updated_local);
- reg_updated_local
- }
- else {
- // short path: The address written to is equal to ESP/SP minus two
- let reg_updated_local = ctx.builder.tee_new_local();
- gen_safe_write16(ctx, ®_updated_local, &value_local);
- reg_updated_local
- };
- if ctx.cpu.ssize_32() {
- gen_set_reg32(ctx, regs::ESP);
- }
- else {
- gen_set_reg16(ctx, regs::SP);
- };
- ctx.builder.free_local(reg_updated_local);
- }
- pub fn gen_push32(ctx: &mut JitContext, value_local: &WasmLocal) {
- if ctx.cpu.ssize_32() {
- gen_get_reg32(ctx, regs::ESP);
- }
- else {
- gen_get_reg16(ctx, regs::SP);
- };
- ctx.builder.const_i32(4);
- ctx.builder.sub_i32();
- let new_sp_local = if !ctx.cpu.ssize_32() || !ctx.cpu.has_flat_segmentation() {
- let new_sp_local = ctx.builder.tee_new_local();
- if !ctx.cpu.ssize_32() {
- ctx.builder.const_i32(0xFFFF);
- ctx.builder.and_i32();
- }
- if !ctx.cpu.has_flat_segmentation() {
- gen_get_ss_offset(ctx);
- ctx.builder.add_i32();
- }
- let sp_local = ctx.builder.set_new_local();
- gen_safe_write32(ctx, &sp_local, &value_local);
- ctx.builder.free_local(sp_local);
- ctx.builder.get_local(&new_sp_local);
- new_sp_local
- }
- else {
- // short path: The address written to is equal to ESP/SP minus four
- let new_sp_local = ctx.builder.tee_new_local();
- gen_safe_write32(ctx, &new_sp_local, &value_local);
- new_sp_local
- };
- if ctx.cpu.ssize_32() {
- gen_set_reg32(ctx, regs::ESP);
- }
- else {
- gen_set_reg16(ctx, regs::SP);
- };
- ctx.builder.free_local(new_sp_local);
- }
- pub fn gen_get_real_eip(ctx: &mut JitContext) {
- gen_get_eip(ctx.builder);
- ctx.builder
- .load_fixed_i32(global_pointers::get_seg_offset(regs::CS));
- ctx.builder.sub_i32();
- }
- pub fn gen_set_last_op1(builder: &mut WasmBuilder, source: &WasmLocal) {
- builder.const_i32(global_pointers::last_op1 as i32);
- builder.get_local(&source);
- builder.store_aligned_i32(0);
- }
- pub fn gen_set_last_result(builder: &mut WasmBuilder, source: &WasmLocal) {
- builder.const_i32(global_pointers::last_result as i32);
- builder.get_local(&source);
- builder.store_aligned_i32(0);
- }
- pub fn gen_set_last_op_size(builder: &mut WasmBuilder, value: i32) {
- builder.const_i32(global_pointers::last_op_size as i32);
- builder.const_i32(value);
- builder.store_aligned_i32(0);
- }
- pub fn gen_set_flags_changed(builder: &mut WasmBuilder, value: i32) {
- builder.const_i32(global_pointers::flags_changed as i32);
- builder.const_i32(value);
- builder.store_aligned_i32(0);
- }
- pub fn gen_clear_flags_changed_bits(builder: &mut WasmBuilder, bits_to_clear: i32) {
- builder.const_i32(global_pointers::flags_changed as i32);
- gen_get_flags_changed(builder);
- builder.const_i32(!bits_to_clear);
- builder.and_i32();
- builder.store_aligned_i32(0);
- }
- pub fn gen_set_flags_bits(builder: &mut WasmBuilder, bits_to_set: i32) {
- builder.const_i32(global_pointers::flags as i32);
- gen_get_flags(builder);
- builder.const_i32(bits_to_set);
- builder.or_i32();
- builder.store_aligned_i32(0);
- }
- pub fn gen_clear_flags_bits(builder: &mut WasmBuilder, bits_to_clear: i32) {
- builder.const_i32(global_pointers::flags as i32);
- gen_get_flags(builder);
- builder.const_i32(!bits_to_clear);
- builder.and_i32();
- builder.store_aligned_i32(0);
- }
- pub fn gen_getzf(builder: &mut WasmBuilder) {
- gen_get_flags_changed(builder);
- builder.const_i32(FLAG_ZERO);
- builder.and_i32();
- builder.if_i32();
- gen_get_last_result(builder);
- let last_result = builder.tee_new_local();
- builder.const_i32(-1);
- builder.xor_i32();
- builder.get_local(&last_result);
- builder.free_local(last_result);
- builder.const_i32(1);
- builder.sub_i32();
- builder.and_i32();
- gen_get_last_op_size(builder);
- builder.shr_u_i32();
- builder.const_i32(1);
- builder.and_i32();
- builder.else_();
- gen_get_flags(builder);
- builder.const_i32(FLAG_ZERO);
- builder.and_i32();
- builder.block_end();
- }
- pub fn gen_getcf(builder: &mut WasmBuilder) {
- gen_get_flags_changed(builder);
- let flags_changed = builder.tee_new_local();
- builder.const_i32(FLAG_CARRY);
- builder.and_i32();
- builder.if_i32();
- builder.get_local(&flags_changed);
- builder.const_i32(31);
- builder.shr_s_i32();
- builder.free_local(flags_changed);
- let sub_mask = builder.set_new_local();
- gen_get_last_result(builder);
- builder.get_local(&sub_mask);
- builder.xor_i32();
- gen_get_last_op1(builder);
- builder.get_local(&sub_mask);
- builder.xor_i32();
- builder.ltu_i32();
- builder.else_();
- gen_get_flags(builder);
- builder.const_i32(FLAG_CARRY);
- builder.and_i32();
- builder.block_end();
- builder.free_local(sub_mask);
- }
- pub fn gen_getsf(builder: &mut WasmBuilder) {
- gen_get_flags_changed(builder);
- builder.const_i32(FLAG_SIGN);
- builder.and_i32();
- builder.if_i32();
- {
- gen_get_last_result(builder);
- gen_get_last_op_size(builder);
- builder.shr_u_i32();
- builder.const_i32(1);
- builder.and_i32();
- }
- builder.else_();
- {
- gen_get_flags(builder);
- builder.const_i32(FLAG_SIGN);
- builder.and_i32();
- }
- builder.block_end();
- }
- pub fn gen_getof(builder: &mut WasmBuilder) {
- gen_get_flags_changed(builder);
- let flags_changed = builder.tee_new_local();
- builder.const_i32(FLAG_OVERFLOW);
- builder.and_i32();
- builder.if_i32();
- {
- gen_get_last_op1(builder);
- let last_op1 = builder.tee_new_local();
- gen_get_last_result(builder);
- let last_result = builder.tee_new_local();
- builder.xor_i32();
- builder.get_local(&last_result);
- builder.get_local(&last_op1);
- builder.sub_i32();
- gen_get_flags_changed(builder);
- builder.const_i32(31);
- builder.shr_u_i32();
- builder.sub_i32();
- builder.get_local(&last_result);
- builder.xor_i32();
- builder.and_i32();
- gen_get_last_op_size(builder);
- builder.shr_u_i32();
- builder.const_i32(1);
- builder.and_i32();
- builder.free_local(last_op1);
- builder.free_local(last_result);
- }
- builder.else_();
- {
- gen_get_flags(builder);
- builder.const_i32(FLAG_OVERFLOW);
- builder.and_i32();
- }
- builder.block_end();
- builder.free_local(flags_changed);
- }
- pub fn gen_test_be(builder: &mut WasmBuilder) {
- // TODO: A more efficient implementation is possible
- gen_getcf(builder);
- gen_getzf(builder);
- builder.or_i32();
- }
- pub fn gen_test_l(builder: &mut WasmBuilder) {
- // TODO: A more efficient implementation is possible
- gen_getsf(builder);
- builder.eqz_i32();
- gen_getof(builder);
- builder.eqz_i32();
- builder.xor_i32();
- }
- pub fn gen_test_le(builder: &mut WasmBuilder) {
- // TODO: A more efficient implementation is possible
- gen_test_l(builder);
- gen_getzf(builder);
- builder.or_i32();
- }
- pub fn gen_test_loopnz(ctx: &mut JitContext, is_asize_32: bool) {
- gen_test_loop(ctx, is_asize_32);
- ctx.builder.eqz_i32();
- gen_getzf(&mut ctx.builder);
- ctx.builder.or_i32();
- ctx.builder.eqz_i32();
- }
- pub fn gen_test_loopz(ctx: &mut JitContext, is_asize_32: bool) {
- gen_test_loop(ctx, is_asize_32);
- ctx.builder.eqz_i32();
- gen_getzf(&mut ctx.builder);
- ctx.builder.eqz_i32();
- ctx.builder.or_i32();
- ctx.builder.eqz_i32();
- }
- pub fn gen_test_loop(ctx: &mut JitContext, is_asize_32: bool) {
- if is_asize_32 {
- gen_get_reg32(ctx, regs::ECX);
- }
- else {
- gen_get_reg16(ctx, regs::CX);
- }
- }
- pub fn gen_test_jcxz(ctx: &mut JitContext, is_asize_32: bool) {
- if is_asize_32 {
- gen_get_reg32(ctx, regs::ECX);
- }
- else {
- gen_get_reg16(ctx, regs::CX);
- }
- ctx.builder.eqz_i32();
- }
- pub fn gen_fpu_get_sti(ctx: &mut JitContext, i: u32) {
- ctx.builder
- .const_i32(global_pointers::sse_scratch_register as i32);
- ctx.builder.const_i32(i as i32);
- ctx.builder.call_fn2("fpu_get_sti");
- ctx.builder
- .load_fixed_i64(global_pointers::sse_scratch_register as u32);
- ctx.builder
- .load_fixed_u16(global_pointers::sse_scratch_register as u32 + 8);
- }
- pub fn gen_fpu_load_m32(ctx: &mut JitContext, modrm_byte: ModrmByte) {
- ctx.builder
- .const_i32(global_pointers::sse_scratch_register as i32);
- gen_modrm_resolve_safe_read32(ctx, modrm_byte);
- ctx.builder.call_fn2("f32_to_f80");
- ctx.builder
- .load_fixed_i64(global_pointers::sse_scratch_register as u32);
- ctx.builder
- .load_fixed_u16(global_pointers::sse_scratch_register as u32 + 8);
- }
- pub fn gen_fpu_load_m64(ctx: &mut JitContext, modrm_byte: ModrmByte) {
- ctx.builder
- .const_i32(global_pointers::sse_scratch_register as i32);
- gen_modrm_resolve_safe_read64(ctx, modrm_byte);
- ctx.builder.call_fn2_i32_i64("f64_to_f80");
- ctx.builder
- .load_fixed_i64(global_pointers::sse_scratch_register as u32);
- ctx.builder
- .load_fixed_u16(global_pointers::sse_scratch_register as u32 + 8);
- }
- pub fn gen_fpu_load_i16(ctx: &mut JitContext, modrm_byte: ModrmByte) {
- ctx.builder
- .const_i32(global_pointers::sse_scratch_register as i32);
- gen_modrm_resolve_safe_read16(ctx, modrm_byte);
- sign_extend_i16(ctx.builder);
- ctx.builder.call_fn2("i32_to_f80");
- ctx.builder
- .load_fixed_i64(global_pointers::sse_scratch_register as u32);
- ctx.builder
- .load_fixed_u16(global_pointers::sse_scratch_register as u32 + 8);
- }
- pub fn gen_fpu_load_i32(ctx: &mut JitContext, modrm_byte: ModrmByte) {
- ctx.builder
- .const_i32(global_pointers::sse_scratch_register as i32);
- gen_modrm_resolve_safe_read32(ctx, modrm_byte);
- ctx.builder.call_fn2("i32_to_f80");
- ctx.builder
- .load_fixed_i64(global_pointers::sse_scratch_register as u32);
- ctx.builder
- .load_fixed_u16(global_pointers::sse_scratch_register as u32 + 8);
- }
- pub fn gen_fpu_load_i64(ctx: &mut JitContext, modrm_byte: ModrmByte) {
- ctx.builder
- .const_i32(global_pointers::sse_scratch_register as i32);
- gen_modrm_resolve_safe_read64(ctx, modrm_byte);
- ctx.builder.call_fn2_i32_i64("i64_to_f80");
- ctx.builder
- .load_fixed_i64(global_pointers::sse_scratch_register as u32);
- ctx.builder
- .load_fixed_u16(global_pointers::sse_scratch_register as u32 + 8);
- }
- pub fn gen_trigger_de(ctx: &mut JitContext) {
- gen_fn1_const(
- ctx.builder,
- "trigger_de_jit",
- ctx.start_of_current_instruction,
- );
- gen_debug_track_jit_exit(ctx.builder, ctx.start_of_current_instruction);
- ctx.builder.br(ctx.exit_with_fault_label);
- }
- pub fn gen_trigger_ud(ctx: &mut JitContext) {
- gen_fn1_const(
- ctx.builder,
- "trigger_ud_jit",
- ctx.start_of_current_instruction,
- );
- gen_debug_track_jit_exit(ctx.builder, ctx.start_of_current_instruction);
- ctx.builder.br(ctx.exit_with_fault_label);
- }
- pub fn gen_trigger_gp(ctx: &mut JitContext, error_code: u32) {
- gen_fn2_const(
- ctx.builder,
- "trigger_gp_jit",
- error_code,
- ctx.start_of_current_instruction,
- );
- gen_debug_track_jit_exit(ctx.builder, ctx.start_of_current_instruction);
- ctx.builder.br(ctx.exit_with_fault_label);
- }
- pub fn gen_condition_fn(ctx: &mut JitContext, condition: u8) {
- if condition & 0xF0 == 0x00 || condition & 0xF0 == 0x70 || condition & 0xF0 == 0x80 {
- match condition & 0xF {
- 0x0 => {
- gen_getof(ctx.builder);
- },
- 0x1 => {
- gen_getof(ctx.builder);
- ctx.builder.eqz_i32();
- },
- 0x2 => {
- gen_getcf(ctx.builder);
- },
- 0x3 => {
- gen_getcf(ctx.builder);
- ctx.builder.eqz_i32();
- },
- 0x4 => {
- gen_getzf(ctx.builder);
- },
- 0x5 => {
- gen_getzf(ctx.builder);
- ctx.builder.eqz_i32();
- },
- 0x6 => {
- gen_test_be(ctx.builder);
- },
- 0x7 => {
- gen_test_be(ctx.builder);
- ctx.builder.eqz_i32();
- },
- 0x8 => {
- gen_getsf(ctx.builder);
- },
- 0x9 => {
- gen_getsf(ctx.builder);
- ctx.builder.eqz_i32();
- },
- 0xA => ctx.builder.call_fn0_ret("test_p"),
- 0xB => ctx.builder.call_fn0_ret("test_np"),
- 0xC => {
- gen_test_l(ctx.builder);
- },
- 0xD => {
- gen_test_l(ctx.builder);
- ctx.builder.eqz_i32();
- },
- 0xE => {
- gen_test_le(ctx.builder);
- },
- 0xF => {
- gen_test_le(ctx.builder);
- ctx.builder.eqz_i32();
- },
- _ => dbg_assert!(false),
- }
- }
- else {
- // loop, loopnz, loopz, jcxz
- dbg_assert!(condition & !0x3 == 0xE0);
- if condition == 0xE0 {
- gen_test_loopnz(ctx, ctx.cpu.asize_32());
- }
- else if condition == 0xE1 {
- gen_test_loopz(ctx, ctx.cpu.asize_32());
- }
- else if condition == 0xE2 {
- gen_test_loop(ctx, ctx.cpu.asize_32());
- }
- else if condition == 0xE3 {
- gen_test_jcxz(ctx, ctx.cpu.asize_32());
- }
- }
- }
- pub fn gen_move_registers_from_locals_to_memory(ctx: &mut JitContext) {
- let instruction = memory::read32s(ctx.start_of_current_instruction) as u32;
- ::opstats::gen_opstat_unguarded_register(ctx.builder, instruction);
- for i in 0..8 {
- ctx.builder
- .const_i32(global_pointers::get_reg32_offset(i as u32) as i32);
- ctx.builder.get_local(&ctx.register_locals[i]);
- ctx.builder.store_aligned_i32(0);
- }
- }
- pub fn gen_move_registers_from_memory_to_locals(ctx: &mut JitContext) {
- let instruction = memory::read32s(ctx.start_of_current_instruction) as u32;
- ::opstats::gen_opstat_unguarded_register(ctx.builder, instruction);
- for i in 0..8 {
- ctx.builder
- .const_i32(global_pointers::get_reg32_offset(i as u32) as i32);
- ctx.builder.load_aligned_i32(0);
- ctx.builder.set_local(&ctx.register_locals[i]);
- }
- }
- pub fn gen_profiler_stat_increment(builder: &mut WasmBuilder, stat: profiler::stat) {
- if !cfg!(feature = "profiler") {
- return;
- }
- let addr = unsafe { profiler::stat_array.as_mut_ptr().offset(stat as isize) } as u32;
- builder.increment_fixed_i32(addr, 1)
- }
- pub fn gen_debug_track_jit_exit(builder: &mut WasmBuilder, address: u32) {
- if cfg!(feature = "profiler") {
- gen_fn1_const(builder, "track_jit_exit", address);
- }
- }
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