mirror of
https://github.com/denoland/deno.git
synced 2024-12-14 19:37:59 -05:00
3b65d297c7
Co-authored-by: Levente Kurusa <lkurusa@kernelstuff.org> Co-authored-by: Bartek Iwańczuk <biwanczuk@gmail.com>
2063 lines
72 KiB
Rust
2063 lines
72 KiB
Rust
// Copyright 2018-2023 the Deno authors. All rights reserved. MIT license.
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use std::cmp::max;
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use std::ffi::c_void;
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use std::iter::once;
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use deno_core::v8::fast_api;
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use dynasmrt::dynasm;
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use dynasmrt::DynasmApi;
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use dynasmrt::ExecutableBuffer;
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use crate::dlfcn::needs_unwrap;
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use crate::NativeType;
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use crate::Symbol;
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pub(crate) fn is_compatible(sym: &Symbol) -> bool {
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// TODO: Support structs by value in fast call
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cfg!(any(
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all(target_arch = "x86_64", target_family = "unix"),
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all(target_arch = "x86_64", target_family = "windows"),
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all(target_arch = "aarch64", target_vendor = "apple")
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)) && !sym.can_callback
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&& !matches!(sym.result_type, NativeType::Struct(_))
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&& !sym
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.parameter_types
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.iter()
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.any(|t| matches!(t, NativeType::Struct(_)))
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}
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pub(crate) fn compile_trampoline(sym: &Symbol) -> Trampoline {
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#[cfg(all(target_arch = "x86_64", target_family = "unix"))]
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return SysVAmd64::compile(sym);
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#[cfg(all(target_arch = "x86_64", target_family = "windows"))]
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return Win64::compile(sym);
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#[cfg(all(target_arch = "aarch64", target_vendor = "apple"))]
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return Aarch64Apple::compile(sym);
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#[allow(unreachable_code)]
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{
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unimplemented!("fast API is not implemented for the current target");
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}
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}
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pub(crate) fn make_template(
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sym: &Symbol,
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trampoline: &Trampoline,
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) -> fast_api::FastFunction {
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let mut params = once(fast_api::Type::V8Value) // Receiver
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.chain(sym.parameter_types.iter().map(|t| t.into()))
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.collect::<Vec<_>>();
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let ret = if needs_unwrap(&sym.result_type) {
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params.push(fast_api::Type::TypedArray(fast_api::CType::Int32));
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fast_api::CType::Void
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} else if sym.result_type == NativeType::Buffer {
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// Buffer can be used as a return type and converts differently than in parameters.
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fast_api::CType::Pointer
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} else {
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fast_api::CType::from(&fast_api::Type::from(&sym.result_type))
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};
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fast_api::FastFunction::new(
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Box::leak(params.into_boxed_slice()),
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ret,
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trampoline.ptr(),
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)
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}
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/// Trampoline for fast-call FFI functions
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///
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/// Calls the FFI function without the first argument (the receiver)
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pub(crate) struct Trampoline(ExecutableBuffer);
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impl Trampoline {
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fn ptr(&self) -> *const c_void {
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&self.0[0] as *const u8 as *const c_void
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}
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}
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impl From<&NativeType> for fast_api::Type {
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fn from(native_type: &NativeType) -> Self {
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match native_type {
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NativeType::Bool => fast_api::Type::Bool,
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NativeType::U8 | NativeType::U16 | NativeType::U32 => {
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fast_api::Type::Uint32
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}
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NativeType::I8 | NativeType::I16 | NativeType::I32 => {
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fast_api::Type::Int32
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}
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NativeType::F32 => fast_api::Type::Float32,
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NativeType::F64 => fast_api::Type::Float64,
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NativeType::Void => fast_api::Type::Void,
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NativeType::I64 => fast_api::Type::Int64,
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NativeType::U64 => fast_api::Type::Uint64,
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NativeType::ISize => fast_api::Type::Int64,
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NativeType::USize => fast_api::Type::Uint64,
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NativeType::Pointer | NativeType::Function => fast_api::Type::Pointer,
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NativeType::Buffer => fast_api::Type::TypedArray(fast_api::CType::Uint8),
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NativeType::Struct(_) => {
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fast_api::Type::TypedArray(fast_api::CType::Uint8)
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}
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}
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}
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}
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macro_rules! x64 {
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($assembler:expr; $($tokens:tt)+) => {
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dynasm!($assembler; .arch x64; $($tokens)+)
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}
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}
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macro_rules! aarch64 {
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($assembler:expr; $($tokens:tt)+) => {
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dynasm!($assembler; .arch aarch64; $($tokens)+)
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}
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}
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struct SysVAmd64 {
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// Reference: https://refspecs.linuxfoundation.org/elf/x86_64-abi-0.99.pdf
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assmblr: dynasmrt::x64::Assembler,
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// Parameter counters
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integral_params: u32,
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float_params: u32,
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// Stack offset accumulators
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offset_trampoline: u32,
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offset_callee: u32,
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allocated_stack: u32,
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frame_pointer: u32,
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}
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#[cfg_attr(
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not(all(target_aarch = "x86_64", target_family = "unix")),
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allow(dead_code)
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)]
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impl SysVAmd64 {
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// Integral arguments go to the following GPR, in order: rdi, rsi, rdx, rcx, r8, r9
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const INTEGRAL_REGISTERS: u32 = 6;
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// SSE arguments go to the first 8 SSE registers: xmm0-xmm7
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const FLOAT_REGISTERS: u32 = 8;
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fn new() -> Self {
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Self {
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assmblr: dynasmrt::x64::Assembler::new().unwrap(),
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integral_params: 0,
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float_params: 0,
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// Start at 8 to account for trampoline caller's return address
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offset_trampoline: 8,
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// default to tail-call mode. If a new stack frame is allocated this becomes 0
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offset_callee: 8,
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allocated_stack: 0,
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frame_pointer: 0,
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}
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}
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fn compile(sym: &Symbol) -> Trampoline {
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let mut compiler = Self::new();
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let must_cast_return_value =
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compiler.must_cast_return_value(&sym.result_type);
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let must_wrap_return_value =
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compiler.must_wrap_return_value_in_typed_array(&sym.result_type);
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let must_save_preserved_register = must_wrap_return_value;
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let cannot_tailcall = must_cast_return_value || must_wrap_return_value;
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if cannot_tailcall {
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if must_save_preserved_register {
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compiler.save_preserved_register_to_stack();
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}
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compiler.allocate_stack(&sym.parameter_types);
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}
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for param in sym.parameter_types.iter().cloned() {
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compiler.move_left(param)
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}
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if !compiler.is_recv_arg_overridden() {
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// the receiver object should never be expected. Avoid its unexpected or deliberate leak
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compiler.zero_first_arg();
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}
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if must_wrap_return_value {
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compiler.save_out_array_to_preserved_register();
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}
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if cannot_tailcall {
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compiler.call(sym.ptr.as_ptr());
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if must_cast_return_value {
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compiler.cast_return_value(&sym.result_type);
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}
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if must_wrap_return_value {
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compiler.wrap_return_value_in_out_array();
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}
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compiler.deallocate_stack();
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if must_save_preserved_register {
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compiler.recover_preserved_register();
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}
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compiler.ret();
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} else {
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compiler.tailcall(sym.ptr.as_ptr());
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}
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Trampoline(compiler.finalize())
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}
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fn move_left(&mut self, param: NativeType) {
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// Section 3.2.3 of the SysV ABI spec, on argument classification:
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// - INTEGER:
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// > Arguments of types (signed and unsigned) _Bool, char, short, int,
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// > long, long long, and pointers are in the INTEGER class.
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// - SSE:
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// > Arguments of types float, double, _Decimal32, _Decimal64 and
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// > __m64 are in class SSE.
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match param.into() {
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Int(integral) => self.move_integral(integral),
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Float(float) => self.move_float(float),
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}
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}
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fn move_float(&mut self, param: Floating) {
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// Section 3.2.3 of the SysV AMD64 ABI:
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// > If the class is SSE, the next available vector register is used, the registers
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// > are taken in the order from %xmm0 to %xmm7.
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// [...]
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// > Once registers are assigned, the arguments passed in memory are pushed on
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// > the stack in reversed (right-to-left) order
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let param_i = self.float_params;
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let is_in_stack = param_i >= Self::FLOAT_REGISTERS;
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// floats are only moved to accommodate integer movement in the stack
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let stack_has_moved = self.allocated_stack > 0
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|| self.integral_params >= Self::INTEGRAL_REGISTERS;
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if is_in_stack && stack_has_moved {
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let s = &mut self.assmblr;
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let ot = self.offset_trampoline as i32;
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let oc = self.offset_callee as i32;
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match param {
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Single => x64!(s
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; movss xmm8, [rsp + ot]
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; movss [rsp + oc], xmm8
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),
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Double => x64!(s
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; movsd xmm8, [rsp + ot]
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; movsd [rsp + oc], xmm8
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),
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}
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// Section 3.2.3 of the SysV AMD64 ABI:
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// > The size of each argument gets rounded up to eightbytes. [...] Therefore the stack will always be eightbyte aligned.
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self.offset_trampoline += 8;
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self.offset_callee += 8;
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debug_assert!(
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self.allocated_stack == 0 || self.offset_callee <= self.allocated_stack
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);
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}
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self.float_params += 1;
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}
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fn move_integral(&mut self, arg: Integral) {
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// Section 3.2.3 of the SysV AMD64 ABI:
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// > If the class is INTEGER, the next available register of the sequence %rdi,
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// > %rsi, %rdx, %rcx, %r8 and %r9 is used
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// [...]
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// > Once registers are assigned, the arguments passed in memory are pushed on
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// > the stack in reversed (right-to-left) order
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let s = &mut self.assmblr;
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let param_i = self.integral_params;
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// move each argument one position to the left. The first argument in the stack moves to the last integer register (r9).
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// If the FFI function is called with a new stack frame, the arguments remaining in the stack are copied to the new stack frame.
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// Otherwise, they are copied 8 bytes lower in the same frame
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match (param_i, arg) {
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// u8 and u16 parameters are defined as u32 parameters in the V8's fast API function. The trampoline takes care of the cast.
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// Conventionally, many compilers expect 8 and 16 bit arguments to be sign/zero extended by the caller
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// See https://stackoverflow.com/a/36760539/2623340
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(0, U(B)) => x64!(s; movzx edi, sil),
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(0, I(B)) => x64!(s; movsx edi, sil),
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(0, U(W)) => x64!(s; movzx edi, si),
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(0, I(W)) => x64!(s; movsx edi, si),
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(0, U(DW) | I(DW)) => x64!(s; mov edi, esi),
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(0, U(QW) | I(QW)) => x64!(s; mov rdi, rsi),
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// The fast API expects buffer arguments passed as a pointer to a FastApiTypedArray<Uint8> struct
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// Here we blindly follow the layout of https://github.com/denoland/rusty_v8/blob/main/src/fast_api.rs#L190-L200
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// although that might be problematic: https://discord.com/channels/684898665143206084/956626010248478720/1009450940866252823
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(0, Buffer) => x64!(s; mov rdi, [rsi + 8]),
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(1, U(B)) => x64!(s; movzx esi, dl),
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(1, I(B)) => x64!(s; movsx esi, dl),
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(1, U(W)) => x64!(s; movzx esi, dx),
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(1, I(W)) => x64!(s; movsx esi, dx),
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(1, U(DW) | I(DW)) => x64!(s; mov esi, edx),
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(1, U(QW) | I(QW)) => x64!(s; mov rsi, rdx),
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(1, Buffer) => x64!(s; mov rsi, [rdx + 8]),
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(2, U(B)) => x64!(s; movzx edx, cl),
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(2, I(B)) => x64!(s; movsx edx, cl),
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(2, U(W)) => x64!(s; movzx edx, cx),
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(2, I(W)) => x64!(s; movsx edx, cx),
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(2, U(DW) | I(DW)) => x64!(s; mov edx, ecx),
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(2, U(QW) | I(QW)) => x64!(s; mov rdx, rcx),
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(2, Buffer) => x64!(s; mov rdx, [rcx + 8]),
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(3, U(B)) => x64!(s; movzx ecx, r8b),
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(3, I(B)) => x64!(s; movsx ecx, r8b),
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(3, U(W)) => x64!(s; movzx ecx, r8w),
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(3, I(W)) => x64!(s; movsx ecx, r8w),
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(3, U(DW) | I(DW)) => x64!(s; mov ecx, r8d),
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(3, U(QW) | I(QW)) => x64!(s; mov rcx, r8),
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(3, Buffer) => x64!(s; mov rcx, [r8 + 8]),
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(4, U(B)) => x64!(s; movzx r8d, r9b),
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(4, I(B)) => x64!(s; movsx r8d, r9b),
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(4, U(W)) => x64!(s; movzx r8d, r9w),
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(4, I(W)) => x64!(s; movsx r8d, r9w),
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(4, U(DW) | I(DW)) => x64!(s; mov r8d, r9d),
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(4, U(QW) | I(QW)) => x64!(s; mov r8, r9),
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(4, Buffer) => x64!(s; mov r8, [r9 + 8]),
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(5, param) => {
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let ot = self.offset_trampoline as i32;
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// First argument in stack goes to last register (r9)
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match param {
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U(B) => x64!(s; movzx r9d, BYTE [rsp + ot]),
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I(B) => x64!(s; movsx r9d, BYTE [rsp + ot]),
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U(W) => x64!(s; movzx r9d, WORD [rsp + ot]),
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I(W) => x64!(s; movsx r9d, WORD [rsp + ot]),
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U(DW) | I(DW) => x64!(s; mov r9d, [rsp + ot]),
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U(QW) | I(QW) => x64!(s; mov r9, [rsp + ot]),
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Buffer => x64!(s
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; mov r9, [rsp + ot]
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; mov r9, [r9 + 8]
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),
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}
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// Section 3.2.3 of the SysV AMD64 ABI:
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// > The size of each argument gets rounded up to eightbytes. [...] Therefore the stack will always be eightbyte aligned.
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self.offset_trampoline += 8;
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}
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(6.., param) => {
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let ot = self.offset_trampoline as i32;
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let oc = self.offset_callee as i32;
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match param {
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U(B) => x64!(s
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// TODO: optimize to [rsp] (without immediate) when offset is 0
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; movzx eax, BYTE [rsp + ot]
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; mov [rsp + oc], eax
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),
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I(B) => x64!(s
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; movsx eax, BYTE [rsp + ot]
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; mov [rsp + oc], eax
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),
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U(W) => x64!(s
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; movzx eax, WORD [rsp + ot]
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; mov [rsp + oc], eax
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),
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I(W) => x64!(s
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; movsx eax, WORD [rsp + ot]
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; mov [rsp + oc], eax
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),
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U(DW) | I(DW) => x64!(s
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; mov eax, [rsp + ot]
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; mov [rsp + oc], eax
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),
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U(QW) | I(QW) => x64!(s
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; mov rax, [rsp + ot]
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; mov [rsp + oc], rax
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),
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Buffer => x64!(s
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; mov rax, [rsp + ot]
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; mov rax, [rax + 8]
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; mov [rsp + oc], rax
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),
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}
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// Section 3.2.3 of the SysV AMD64 ABI:
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// > The size of each argument gets rounded up to eightbytes. [...] Therefore the stack will always be eightbyte aligned.
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self.offset_trampoline += 8;
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self.offset_callee += 8;
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debug_assert!(
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self.allocated_stack == 0
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|| self.offset_callee <= self.allocated_stack
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);
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}
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}
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self.integral_params += 1;
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}
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fn zero_first_arg(&mut self) {
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debug_assert!(
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self.integral_params == 0,
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"the trampoline would zero the first argument after having overridden it with the second one"
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);
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dynasm!(self.assmblr
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; .arch x64
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; xor edi, edi
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);
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}
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fn cast_return_value(&mut self, rv: &NativeType) {
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let s = &mut self.assmblr;
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// V8 only supports 32bit integers. We support 8 and 16 bit integers casting them to 32bits.
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// In SysV-AMD64 the convention dictates that the unused bits of the return value contain garbage, so we
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// need to zero/sign extend the return value explicitly
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match rv {
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NativeType::U8 => x64!(s; movzx eax, al),
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NativeType::I8 => x64!(s; movsx eax, al),
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NativeType::U16 => x64!(s; movzx eax, ax),
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NativeType::I16 => x64!(s; movsx eax, ax),
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_ => (),
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}
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}
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fn save_out_array_to_preserved_register(&mut self) {
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let s = &mut self.assmblr;
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// functions returning 64 bit integers have the out array appended as their last parameter,
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// and it is a *FastApiTypedArray<Int32>
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match self.integral_params {
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// Trampoline's signature is (receiver, [param0, param1, ...], *FastApiTypedArray)
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// self.integral_params account only for the original params [param0, param1, ...]
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// and the out array has not been moved left
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0 => x64!(s; mov rbx, [rsi + 8]),
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1 => x64!(s; mov rbx, [rdx + 8]),
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2 => x64!(s; mov rbx, [rcx + 8]),
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3 => x64!(s; mov rbx, [r8 + 8]),
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4 => x64!(s; mov rbx, [r9 + 8]),
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5.. => {
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x64!(s
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; mov rax, [rsp + self.offset_trampoline as i32]
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; mov rbx, [rax + 8]
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)
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}
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}
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}
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fn wrap_return_value_in_out_array(&mut self) {
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x64!(self.assmblr; mov [rbx], rax);
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}
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fn save_preserved_register_to_stack(&mut self) {
|
|
x64!(self.assmblr; push rbx);
|
|
self.offset_trampoline += 8;
|
|
// stack pointer has been modified, and the callee stack parameters are expected at the top of the stack
|
|
self.offset_callee = 0;
|
|
self.frame_pointer += 8;
|
|
}
|
|
|
|
fn recover_preserved_register(&mut self) {
|
|
debug_assert!(
|
|
self.frame_pointer >= 8,
|
|
"the trampoline would try to pop from the stack beyond its frame pointer"
|
|
);
|
|
x64!(self.assmblr; pop rbx);
|
|
self.frame_pointer -= 8;
|
|
// parameter offsets are invalid once this method is called
|
|
}
|
|
|
|
fn allocate_stack(&mut self, params: &[NativeType]) {
|
|
let mut int_params = 0u32;
|
|
let mut float_params = 0u32;
|
|
for param in params {
|
|
match param {
|
|
NativeType::F32 | NativeType::F64 => float_params += 1,
|
|
_ => int_params += 1,
|
|
}
|
|
}
|
|
let mut stack_size = (int_params.saturating_sub(Self::INTEGRAL_REGISTERS)
|
|
+ float_params.saturating_sub(Self::FLOAT_REGISTERS))
|
|
* 8;
|
|
|
|
// Align new stack frame (accounting for the 8 byte of the trampoline caller's return address
|
|
// and any other potential addition to the stack prior to this allocation)
|
|
// Section 3.2.2 of the SysV AMD64 ABI:
|
|
// > The end of the input argument area shall be aligned on a 16 (32 or 64, if
|
|
// > __m256 or __m512 is passed on stack) byte boundary. In other words, the value
|
|
// > (%rsp + 8) is always a multiple of 16 (32 or 64) when control is transferred to
|
|
// > the function entry point. The stack pointer, %rsp, always points to the end of the
|
|
// > latest allocated stack frame.
|
|
stack_size += padding_to_align(16, self.frame_pointer + stack_size + 8);
|
|
|
|
if stack_size > 0 {
|
|
x64!(self.assmblr; sub rsp, stack_size as i32);
|
|
self.offset_trampoline += stack_size;
|
|
// stack pointer has been modified, and the callee stack parameters are expected at the top of the stack
|
|
self.offset_callee = 0;
|
|
self.allocated_stack += stack_size;
|
|
self.frame_pointer += stack_size;
|
|
}
|
|
}
|
|
|
|
fn deallocate_stack(&mut self) {
|
|
debug_assert!(
|
|
self.frame_pointer >= self.allocated_stack,
|
|
"the trampoline would try to deallocate stack beyond its frame pointer"
|
|
);
|
|
if self.allocated_stack > 0 {
|
|
x64!(self.assmblr; add rsp, self.allocated_stack as i32);
|
|
|
|
self.frame_pointer -= self.allocated_stack;
|
|
self.allocated_stack = 0;
|
|
}
|
|
}
|
|
|
|
fn call(&mut self, ptr: *const c_void) {
|
|
// the stack has been aligned during stack allocation and/or pushing of preserved registers
|
|
debug_assert!(
|
|
(8 + self.frame_pointer) % 16 == 0,
|
|
"the trampoline would call the FFI function with an unaligned stack"
|
|
);
|
|
x64!(self.assmblr
|
|
; mov rax, QWORD ptr as _
|
|
; call rax
|
|
);
|
|
}
|
|
|
|
fn tailcall(&mut self, ptr: *const c_void) {
|
|
// stack pointer is never modified and remains aligned
|
|
// return address remains the one provided by the trampoline's caller (V8)
|
|
debug_assert!(
|
|
self.allocated_stack == 0,
|
|
"the trampoline would tail call the FFI function with an outstanding stack allocation"
|
|
);
|
|
debug_assert!(
|
|
self.frame_pointer == 0,
|
|
"the trampoline would tail call the FFI function with outstanding locals in the frame"
|
|
);
|
|
x64!(self.assmblr
|
|
; mov rax, QWORD ptr as _
|
|
; jmp rax
|
|
);
|
|
}
|
|
|
|
fn ret(&mut self) {
|
|
debug_assert!(
|
|
self.allocated_stack == 0,
|
|
"the trampoline would return with an outstanding stack allocation"
|
|
);
|
|
debug_assert!(
|
|
self.frame_pointer == 0,
|
|
"the trampoline would return with outstanding locals in the frame"
|
|
);
|
|
x64!(self.assmblr; ret);
|
|
}
|
|
|
|
fn is_recv_arg_overridden(&self) -> bool {
|
|
// V8 receiver is the first parameter of the trampoline function and is a pointer
|
|
self.integral_params > 0
|
|
}
|
|
|
|
fn must_cast_return_value(&self, rv: &NativeType) -> bool {
|
|
// V8 only supports i32 and u32 return types for integers
|
|
// We support 8 and 16 bit integers by extending them to 32 bits in the trampoline before returning
|
|
matches!(
|
|
rv,
|
|
NativeType::U8 | NativeType::I8 | NativeType::U16 | NativeType::I16
|
|
)
|
|
}
|
|
|
|
fn must_wrap_return_value_in_typed_array(&self, rv: &NativeType) -> bool {
|
|
// V8 only supports i32 and u32 return types for integers
|
|
// We support 64 bit integers by wrapping them in a TypedArray out parameter
|
|
crate::dlfcn::needs_unwrap(rv)
|
|
}
|
|
|
|
fn finalize(self) -> ExecutableBuffer {
|
|
self.assmblr.finalize().unwrap()
|
|
}
|
|
}
|
|
|
|
struct Aarch64Apple {
|
|
// Reference https://github.com/ARM-software/abi-aa/blob/main/aapcs64/aapcs64.rst
|
|
assmblr: dynasmrt::aarch64::Assembler,
|
|
// Parameter counters
|
|
integral_params: u32,
|
|
float_params: u32,
|
|
// Stack offset accumulators
|
|
offset_trampoline: u32,
|
|
offset_callee: u32,
|
|
allocated_stack: u32,
|
|
}
|
|
|
|
#[cfg_attr(
|
|
not(all(target_aarch = "aarch64", target_vendor = "apple")),
|
|
allow(dead_code)
|
|
)]
|
|
impl Aarch64Apple {
|
|
// Integral arguments go to the first 8 GPR: x0-x7
|
|
const INTEGRAL_REGISTERS: u32 = 8;
|
|
// Floating-point arguments go to the first 8 SIMD & Floating-Point registers: v0-v1
|
|
const FLOAT_REGISTERS: u32 = 8;
|
|
|
|
fn new() -> Self {
|
|
Self {
|
|
assmblr: dynasmrt::aarch64::Assembler::new().unwrap(),
|
|
integral_params: 0,
|
|
float_params: 0,
|
|
offset_trampoline: 0,
|
|
offset_callee: 0,
|
|
allocated_stack: 0,
|
|
}
|
|
}
|
|
|
|
fn compile(sym: &Symbol) -> Trampoline {
|
|
let mut compiler = Self::new();
|
|
|
|
let must_wrap_return_value =
|
|
compiler.must_wrap_return_value_in_typed_array(&sym.result_type);
|
|
let must_save_preserved_register = must_wrap_return_value;
|
|
let cannot_tailcall = must_wrap_return_value;
|
|
|
|
if cannot_tailcall {
|
|
compiler.allocate_stack(sym);
|
|
compiler.save_frame_record();
|
|
if compiler.must_save_preserved_register_to_stack(sym) {
|
|
compiler.save_preserved_register_to_stack();
|
|
}
|
|
}
|
|
|
|
for param in sym.parameter_types.iter().cloned() {
|
|
compiler.move_left(param)
|
|
}
|
|
if !compiler.is_recv_arg_overridden() {
|
|
// the receiver object should never be expected. Avoid its unexpected or deliberate leak
|
|
compiler.zero_first_arg();
|
|
}
|
|
if compiler.must_wrap_return_value_in_typed_array(&sym.result_type) {
|
|
compiler.save_out_array_to_preserved_register();
|
|
}
|
|
|
|
if cannot_tailcall {
|
|
compiler.call(sym.ptr.as_ptr());
|
|
if must_wrap_return_value {
|
|
compiler.wrap_return_value_in_out_array();
|
|
}
|
|
if must_save_preserved_register {
|
|
compiler.recover_preserved_register();
|
|
}
|
|
compiler.recover_frame_record();
|
|
compiler.deallocate_stack();
|
|
compiler.ret();
|
|
} else {
|
|
compiler.tailcall(sym.ptr.as_ptr());
|
|
}
|
|
|
|
Trampoline(compiler.finalize())
|
|
}
|
|
|
|
fn move_left(&mut self, param: NativeType) {
|
|
// Section 6.4.2 of the Aarch64 Procedure Call Standard (PCS), on argument classification:
|
|
// - INTEGRAL or POINTER:
|
|
// > If the argument is an Integral or Pointer Type, the size of the argument is less than or equal to 8 bytes
|
|
// > and the NGRN is less than 8, the argument is copied to the least significant bits in x[NGRN].
|
|
//
|
|
// - Floating-Point or Vector:
|
|
// > If the argument is a Half-, Single-, Double- or Quad- precision Floating-point or short vector type
|
|
// > and the NSRN is less than 8, then the argument is allocated to the least significant bits of register v[NSRN]
|
|
match param.into() {
|
|
Int(integral) => self.move_integral(integral),
|
|
Float(float) => self.move_float(float),
|
|
}
|
|
}
|
|
|
|
fn move_float(&mut self, param: Floating) {
|
|
// Section 6.4.2 of the Aarch64 PCS:
|
|
// > If the argument is a Half-, Single-, Double- or Quad- precision Floating-point or short vector type and the NSRN is less than 8, then the
|
|
// > argument is allocated to the least significant bits of register v[NSRN]. The NSRN is incremented by one. The argument has now been allocated.
|
|
// > [if NSRN is equal or more than 8]
|
|
// > The argument is copied to memory at the adjusted NSAA. The NSAA is incremented by the size of the argument. The argument has now been allocated.
|
|
let param_i = self.float_params;
|
|
|
|
let is_in_stack = param_i >= Self::FLOAT_REGISTERS;
|
|
if is_in_stack {
|
|
// https://developer.apple.com/documentation/xcode/writing-arm64-code-for-apple-platforms:
|
|
// > Function arguments may consume slots on the stack that are not multiples of 8 bytes.
|
|
// (i.e. natural alignment instead of eightbyte alignment)
|
|
let padding_trampl =
|
|
(param.size() - self.offset_trampoline % param.size()) % param.size();
|
|
let padding_callee =
|
|
(param.size() - self.offset_callee % param.size()) % param.size();
|
|
|
|
// floats are only moved to accommodate integer movement in the stack
|
|
let stack_has_moved = self.integral_params >= Self::INTEGRAL_REGISTERS;
|
|
if stack_has_moved {
|
|
let s = &mut self.assmblr;
|
|
let ot = self.offset_trampoline;
|
|
let oc = self.offset_callee;
|
|
match param {
|
|
Single => aarch64!(s
|
|
// 6.1.2 Aarch64 PCS:
|
|
// > Registers v8-v15 must be preserved by a callee across subroutine calls;
|
|
// > the remaining registers (v0-v7, v16-v31) do not need to be preserved (or should be preserved by the caller).
|
|
; ldr s16, [sp, ot + padding_trampl]
|
|
; str s16, [sp, oc + padding_callee]
|
|
),
|
|
Double => aarch64!(s
|
|
; ldr d16, [sp, ot + padding_trampl]
|
|
; str d16, [sp, oc + padding_callee]
|
|
),
|
|
}
|
|
}
|
|
self.offset_trampoline += padding_trampl + param.size();
|
|
self.offset_callee += padding_callee + param.size();
|
|
|
|
debug_assert!(
|
|
self.allocated_stack == 0 || self.offset_callee <= self.allocated_stack
|
|
);
|
|
}
|
|
self.float_params += 1;
|
|
}
|
|
|
|
fn move_integral(&mut self, param: Integral) {
|
|
let s = &mut self.assmblr;
|
|
// Section 6.4.2 of the Aarch64 PCS:
|
|
// If the argument is an Integral or Pointer Type, the size of the argument is less than or
|
|
// equal to 8 bytes and the NGRN is less than 8, the argument is copied to the least
|
|
// significant bits in x[NGRN]. The NGRN is incremented by one. The argument has now been
|
|
// allocated.
|
|
// [if NGRN is equal or more than 8]
|
|
// The argument is copied to memory at the adjusted NSAA. The NSAA is incremented by the size
|
|
// of the argument. The argument has now been allocated.
|
|
let param_i = self.integral_params;
|
|
|
|
// move each argument one position to the left. The first argument in the stack moves to the last integer register (x7).
|
|
match (param_i, param) {
|
|
// From https://developer.apple.com/documentation/xcode/writing-arm64-code-for-apple-platforms:
|
|
// > The caller of a function is responsible for signing or zero-extending any argument with fewer than 32 bits.
|
|
// > The standard ABI expects the callee to sign or zero-extend those arguments.
|
|
// (this applies to register parameters, as stack parameters are not eightbyte aligned in Apple)
|
|
(0, I(B)) => aarch64!(s; sxtb w0, w1),
|
|
(0, U(B)) => aarch64!(s; and w0, w1, 0xFF),
|
|
(0, I(W)) => aarch64!(s; sxth w0, w1),
|
|
(0, U(W)) => aarch64!(s; and w0, w1, 0xFFFF),
|
|
(0, I(DW) | U(DW)) => aarch64!(s; mov w0, w1),
|
|
(0, I(QW) | U(QW)) => aarch64!(s; mov x0, x1),
|
|
// The fast API expects buffer arguments passed as a pointer to a FastApiTypedArray<Uint8> struct
|
|
// Here we blindly follow the layout of https://github.com/denoland/rusty_v8/blob/main/src/fast_api.rs#L190-L200
|
|
// although that might be problematic: https://discord.com/channels/684898665143206084/956626010248478720/1009450940866252823
|
|
(0, Buffer) => aarch64!(s; ldr x0, [x1, 8]),
|
|
|
|
(1, I(B)) => aarch64!(s; sxtb w1, w2),
|
|
(1, U(B)) => aarch64!(s; and w1, w2, 0xFF),
|
|
(1, I(W)) => aarch64!(s; sxth w1, w2),
|
|
(1, U(W)) => aarch64!(s; and w1, w2, 0xFFFF),
|
|
(1, I(DW) | U(DW)) => aarch64!(s; mov w1, w2),
|
|
(1, I(QW) | U(QW)) => aarch64!(s; mov x1, x2),
|
|
(1, Buffer) => aarch64!(s; ldr x1, [x2, 8]),
|
|
|
|
(2, I(B)) => aarch64!(s; sxtb w2, w3),
|
|
(2, U(B)) => aarch64!(s; and w2, w3, 0xFF),
|
|
(2, I(W)) => aarch64!(s; sxth w2, w3),
|
|
(2, U(W)) => aarch64!(s; and w2, w3, 0xFFFF),
|
|
(2, I(DW) | U(DW)) => aarch64!(s; mov w2, w3),
|
|
(2, I(QW) | U(QW)) => aarch64!(s; mov x2, x3),
|
|
(2, Buffer) => aarch64!(s; ldr x2, [x3, 8]),
|
|
|
|
(3, I(B)) => aarch64!(s; sxtb w3, w4),
|
|
(3, U(B)) => aarch64!(s; and w3, w4, 0xFF),
|
|
(3, I(W)) => aarch64!(s; sxth w3, w4),
|
|
(3, U(W)) => aarch64!(s; and w3, w4, 0xFFFF),
|
|
(3, I(DW) | U(DW)) => aarch64!(s; mov w3, w4),
|
|
(3, I(QW) | U(QW)) => aarch64!(s; mov x3, x4),
|
|
(3, Buffer) => aarch64!(s; ldr x3, [x4, 8]),
|
|
|
|
(4, I(B)) => aarch64!(s; sxtb w4, w5),
|
|
(4, U(B)) => aarch64!(s; and w4, w5, 0xFF),
|
|
(4, I(W)) => aarch64!(s; sxth w4, w5),
|
|
(4, U(W)) => aarch64!(s; and w4, w5, 0xFFFF),
|
|
(4, I(DW) | U(DW)) => aarch64!(s; mov w4, w5),
|
|
(4, I(QW) | U(QW)) => aarch64!(s; mov x4, x5),
|
|
(4, Buffer) => aarch64!(s; ldr x4, [x5, 8]),
|
|
|
|
(5, I(B)) => aarch64!(s; sxtb w5, w6),
|
|
(5, U(B)) => aarch64!(s; and w5, w6, 0xFF),
|
|
(5, I(W)) => aarch64!(s; sxth w5, w6),
|
|
(5, U(W)) => aarch64!(s; and w5, w6, 0xFFFF),
|
|
(5, I(DW) | U(DW)) => aarch64!(s; mov w5, w6),
|
|
(5, I(QW) | U(QW)) => aarch64!(s; mov x5, x6),
|
|
(5, Buffer) => aarch64!(s; ldr x5, [x6, 8]),
|
|
|
|
(6, I(B)) => aarch64!(s; sxtb w6, w7),
|
|
(6, U(B)) => aarch64!(s; and w6, w7, 0xFF),
|
|
(6, I(W)) => aarch64!(s; sxth w6, w7),
|
|
(6, U(W)) => aarch64!(s; and w6, w7, 0xFFFF),
|
|
(6, I(DW) | U(DW)) => aarch64!(s; mov w6, w7),
|
|
(6, I(QW) | U(QW)) => aarch64!(s; mov x6, x7),
|
|
(6, Buffer) => aarch64!(s; ldr x6, [x7, 8]),
|
|
|
|
(7, param) => {
|
|
let ot = self.offset_trampoline;
|
|
match param {
|
|
I(B) => {
|
|
aarch64!(s; ldrsb w7, [sp, ot])
|
|
}
|
|
U(B) => {
|
|
// ldrb zero-extends the byte to fill the 32bits of the register
|
|
aarch64!(s; ldrb w7, [sp, ot])
|
|
}
|
|
I(W) => {
|
|
aarch64!(s; ldrsh w7, [sp, ot])
|
|
}
|
|
U(W) => {
|
|
// ldrh zero-extends the half-word to fill the 32bits of the register
|
|
aarch64!(s; ldrh w7, [sp, ot])
|
|
}
|
|
I(DW) | U(DW) => {
|
|
aarch64!(s; ldr w7, [sp, ot])
|
|
}
|
|
I(QW) | U(QW) => {
|
|
aarch64!(s; ldr x7, [sp, ot])
|
|
}
|
|
Buffer => {
|
|
aarch64!(s
|
|
; ldr x7, [sp, ot]
|
|
; ldr x7, [x7, 8]
|
|
)
|
|
}
|
|
}
|
|
// 16 and 8 bit integers are 32 bit integers in v8
|
|
self.offset_trampoline += max(param.size(), 4);
|
|
}
|
|
|
|
(8.., param) => {
|
|
// https://developer.apple.com/documentation/xcode/writing-arm64-code-for-apple-platforms:
|
|
// > Function arguments may consume slots on the stack that are not multiples of 8 bytes.
|
|
// (i.e. natural alignment instead of eightbyte alignment)
|
|
//
|
|
// N.B. V8 does not currently follow this Apple's policy, and instead aligns all arguments to 8 Byte boundaries.
|
|
// The current implementation follows the V8 incorrect calling convention for the sake of a seamless experience
|
|
// for the Deno users. Whenever upgrading V8 we should make sure that the bug has not been amended, and revert this
|
|
// workaround once it has been. The bug is being tracked in https://bugs.chromium.org/p/v8/issues/detail?id=13171
|
|
let size_original = param.size();
|
|
// 16 and 8 bit integers are 32 bit integers in v8
|
|
// let size_trampl = max(size_original, 4); // <-- Apple alignment
|
|
let size_trampl = 8; // <-- V8 incorrect alignment
|
|
let padding_trampl =
|
|
padding_to_align(size_trampl, self.offset_trampoline);
|
|
let padding_callee =
|
|
padding_to_align(size_original, self.offset_callee);
|
|
let ot = self.offset_trampoline;
|
|
let oc = self.offset_callee;
|
|
match param {
|
|
I(B) | U(B) => aarch64!(s
|
|
; ldr w8, [sp, ot + padding_trampl]
|
|
; strb w8, [sp, oc + padding_callee]
|
|
),
|
|
I(W) | U(W) => aarch64!(s
|
|
; ldr w8, [sp, ot + padding_trampl]
|
|
; strh w8, [sp, oc + padding_callee]
|
|
),
|
|
I(DW) | U(DW) => aarch64!(s
|
|
; ldr w8, [sp, ot + padding_trampl]
|
|
; str w8, [sp, oc + padding_callee]
|
|
),
|
|
I(QW) | U(QW) => aarch64!(s
|
|
; ldr x8, [sp, ot + padding_trampl]
|
|
; str x8, [sp, oc + padding_callee]
|
|
),
|
|
Buffer => aarch64!(s
|
|
; ldr x8, [sp, ot + padding_trampl]
|
|
; ldr x8, [x8, 8]
|
|
; str x8, [sp, oc + padding_callee]
|
|
),
|
|
}
|
|
self.offset_trampoline += padding_trampl + size_trampl;
|
|
self.offset_callee += padding_callee + size_original;
|
|
|
|
debug_assert!(
|
|
self.allocated_stack == 0
|
|
|| self.offset_callee <= self.allocated_stack
|
|
);
|
|
}
|
|
};
|
|
self.integral_params += 1;
|
|
}
|
|
|
|
fn zero_first_arg(&mut self) {
|
|
debug_assert!(
|
|
self.integral_params == 0,
|
|
"the trampoline would zero the first argument after having overridden it with the second one"
|
|
);
|
|
aarch64!(self.assmblr; mov x0, xzr);
|
|
}
|
|
|
|
fn save_out_array_to_preserved_register(&mut self) {
|
|
let s = &mut self.assmblr;
|
|
// functions returning 64 bit integers have the out array appended as their last parameter,
|
|
// and it is a *FastApiTypedArray<Int32>
|
|
match self.integral_params {
|
|
// x0 is always V8's receiver
|
|
0 => aarch64!(s; ldr x19, [x1, 8]),
|
|
1 => aarch64!(s; ldr x19, [x2, 8]),
|
|
2 => aarch64!(s; ldr x19, [x3, 8]),
|
|
3 => aarch64!(s; ldr x19, [x4, 8]),
|
|
4 => aarch64!(s; ldr x19, [x5, 8]),
|
|
5 => aarch64!(s; ldr x19, [x6, 8]),
|
|
6 => aarch64!(s; ldr x19, [x7, 8]),
|
|
7.. => {
|
|
aarch64!(s
|
|
; ldr x19, [sp, self.offset_trampoline]
|
|
; ldr x19, [x19, 8]
|
|
)
|
|
}
|
|
}
|
|
}
|
|
|
|
fn wrap_return_value_in_out_array(&mut self) {
|
|
aarch64!(self.assmblr; str x0, [x19]);
|
|
}
|
|
|
|
#[allow(clippy::unnecessary_cast)]
|
|
fn save_frame_record(&mut self) {
|
|
debug_assert!(
|
|
self.allocated_stack >= 16,
|
|
"the trampoline would try to save the frame record to the stack without having allocated enough space for it"
|
|
);
|
|
aarch64!(self.assmblr
|
|
// Frame record is stored at the bottom of the stack frame
|
|
; stp x29, x30, [sp, self.allocated_stack - 16]
|
|
; add x29, sp, self.allocated_stack - 16
|
|
)
|
|
}
|
|
|
|
#[allow(clippy::unnecessary_cast)]
|
|
fn recover_frame_record(&mut self) {
|
|
// The stack cannot have been deallocated before the frame record is restored
|
|
debug_assert!(
|
|
self.allocated_stack >= 16,
|
|
"the trampoline would try to load the frame record from the stack, but it couldn't possibly contain it"
|
|
);
|
|
// Frame record is stored at the bottom of the stack frame
|
|
aarch64!(self.assmblr; ldp x29, x30, [sp, self.allocated_stack - 16])
|
|
}
|
|
|
|
fn save_preserved_register_to_stack(&mut self) {
|
|
// If a preserved register needs to be used, we must have allocated at least 32 bytes in the stack
|
|
// 16 for the frame record, 8 for the preserved register, and 8 for 16-byte alignment.
|
|
debug_assert!(
|
|
self.allocated_stack >= 32,
|
|
"the trampoline would try to save a register to the stack without having allocated enough space for it"
|
|
);
|
|
// preserved register is stored after frame record
|
|
aarch64!(self.assmblr; str x19, [sp, self.allocated_stack - 24]);
|
|
}
|
|
|
|
fn recover_preserved_register(&mut self) {
|
|
// The stack cannot have been deallocated before the preserved register is restored
|
|
// 16 for the frame record, 8 for the preserved register, and 8 for 16-byte alignment.
|
|
debug_assert!(
|
|
self.allocated_stack >= 32,
|
|
"the trampoline would try to recover the value of a register from the stack, but it couldn't possibly contain it"
|
|
);
|
|
// preserved register is stored after frame record
|
|
aarch64!(self.assmblr; ldr x19, [sp, self.allocated_stack - 24]);
|
|
}
|
|
|
|
fn allocate_stack(&mut self, symbol: &Symbol) {
|
|
// https://developer.apple.com/documentation/xcode/writing-arm64-code-for-apple-platforms:
|
|
// > Function arguments may consume slots on the stack that are not multiples of 8 bytes.
|
|
// (i.e. natural alignment instead of eightbyte alignment)
|
|
let mut int_params = 0u32;
|
|
let mut float_params = 0u32;
|
|
let mut stack_size = 0u32;
|
|
for param in symbol.parameter_types.iter().cloned() {
|
|
match param.into() {
|
|
Float(float_param) => {
|
|
float_params += 1;
|
|
if float_params > Self::FLOAT_REGISTERS {
|
|
stack_size += float_param.size();
|
|
}
|
|
}
|
|
Int(integral_param) => {
|
|
int_params += 1;
|
|
if int_params > Self::INTEGRAL_REGISTERS {
|
|
stack_size += integral_param.size();
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
// Section 6.2.3 of the Aarch64 PCS:
|
|
// > Each frame shall link to the frame of its caller by means of a frame record of two 64-bit values on the stack
|
|
stack_size += 16;
|
|
|
|
if self.must_save_preserved_register_to_stack(symbol) {
|
|
stack_size += 8;
|
|
}
|
|
|
|
// Section 6.2.2 of Aarch64 PCS:
|
|
// > At any point at which memory is accessed via SP, the hardware requires that
|
|
// > - SP mod 16 = 0. The stack must be quad-word aligned.
|
|
// > The stack must also conform to the following constraint at a public interface:
|
|
// > - SP mod 16 = 0. The stack must be quad-word aligned.
|
|
stack_size += padding_to_align(16, stack_size);
|
|
|
|
if stack_size > 0 {
|
|
aarch64!(self.assmblr; sub sp, sp, stack_size);
|
|
self.offset_trampoline += stack_size;
|
|
// stack pointer has been modified, and the callee stack parameters are expected at the top of the stack
|
|
self.offset_callee = 0;
|
|
self.allocated_stack += stack_size;
|
|
}
|
|
}
|
|
|
|
fn deallocate_stack(&mut self) {
|
|
if self.allocated_stack > 0 {
|
|
aarch64!(self.assmblr; add sp, sp, self.allocated_stack);
|
|
self.allocated_stack = 0;
|
|
}
|
|
}
|
|
|
|
fn call(&mut self, ptr: *const c_void) {
|
|
// the stack has been aligned during stack allocation
|
|
// Frame record has been stored in stack and frame pointer points to it
|
|
debug_assert!(
|
|
self.allocated_stack % 16 == 0,
|
|
"the trampoline would call the FFI function with an unaligned stack"
|
|
);
|
|
debug_assert!(
|
|
self.allocated_stack >= 16,
|
|
"the trampoline would call the FFI function without allocating enough stack for the frame record"
|
|
);
|
|
self.load_callee_address(ptr);
|
|
aarch64!(self.assmblr; blr x8);
|
|
}
|
|
|
|
fn tailcall(&mut self, ptr: *const c_void) {
|
|
// stack pointer is never modified and remains aligned
|
|
// frame pointer and link register remain the one provided by the trampoline's caller (V8)
|
|
debug_assert!(
|
|
self.allocated_stack == 0,
|
|
"the trampoline would tail call the FFI function with an outstanding stack allocation"
|
|
);
|
|
self.load_callee_address(ptr);
|
|
aarch64!(self.assmblr; br x8);
|
|
}
|
|
|
|
fn ret(&mut self) {
|
|
debug_assert!(
|
|
self.allocated_stack == 0,
|
|
"the trampoline would return with an outstanding stack allocation"
|
|
);
|
|
aarch64!(self.assmblr; ret);
|
|
}
|
|
|
|
fn load_callee_address(&mut self, ptr: *const c_void) {
|
|
// Like all ARM instructions, move instructions are 32bit long and can fit at most 16bit immediates.
|
|
// bigger immediates are loaded in multiple steps applying a left-shift modifier
|
|
let mut address = ptr as u64;
|
|
let mut imm16 = address & 0xFFFF;
|
|
aarch64!(self.assmblr; movz x8, imm16 as u32);
|
|
address >>= 16;
|
|
let mut shift = 16;
|
|
while address > 0 {
|
|
imm16 = address & 0xFFFF;
|
|
if imm16 != 0 {
|
|
aarch64!(self.assmblr; movk x8, imm16 as u32, lsl shift);
|
|
}
|
|
address >>= 16;
|
|
shift += 16;
|
|
}
|
|
}
|
|
|
|
fn is_recv_arg_overridden(&self) -> bool {
|
|
// V8 receiver is the first parameter of the trampoline function and is a pointer
|
|
self.integral_params > 0
|
|
}
|
|
|
|
fn must_save_preserved_register_to_stack(&mut self, symbol: &Symbol) -> bool {
|
|
self.must_wrap_return_value_in_typed_array(&symbol.result_type)
|
|
}
|
|
|
|
fn must_wrap_return_value_in_typed_array(&self, rv: &NativeType) -> bool {
|
|
// V8 only supports i32 and u32 return types for integers
|
|
// We support 64 bit integers by wrapping them in a TypedArray out parameter
|
|
crate::dlfcn::needs_unwrap(rv)
|
|
}
|
|
|
|
fn finalize(self) -> ExecutableBuffer {
|
|
self.assmblr.finalize().unwrap()
|
|
}
|
|
}
|
|
|
|
struct Win64 {
|
|
// Reference: https://github.com/MicrosoftDocs/cpp-docs/blob/main/docs/build/x64-calling-convention.md
|
|
assmblr: dynasmrt::x64::Assembler,
|
|
// Params counter (Windows does not distinguish by type with regards to parameter position)
|
|
params: u32,
|
|
// Stack offset accumulators
|
|
offset_trampoline: u32,
|
|
offset_callee: u32,
|
|
allocated_stack: u32,
|
|
frame_pointer: u32,
|
|
}
|
|
|
|
#[cfg_attr(
|
|
not(all(target_aarch = "x86_64", target_family = "windows")),
|
|
allow(dead_code)
|
|
)]
|
|
impl Win64 {
|
|
// Section "Parameter Passing" of the Windows x64 calling convention:
|
|
// > By default, the x64 calling convention passes the first four arguments to a function in registers.
|
|
const REGISTERS: u32 = 4;
|
|
|
|
fn new() -> Self {
|
|
Self {
|
|
assmblr: dynasmrt::x64::Assembler::new().unwrap(),
|
|
params: 0,
|
|
// trampoline caller's return address + trampoline's shadow space
|
|
offset_trampoline: 8 + 32,
|
|
offset_callee: 8 + 32,
|
|
allocated_stack: 0,
|
|
frame_pointer: 0,
|
|
}
|
|
}
|
|
|
|
fn compile(sym: &Symbol) -> Trampoline {
|
|
let mut compiler = Self::new();
|
|
|
|
let must_cast_return_value =
|
|
compiler.must_cast_return_value(&sym.result_type);
|
|
let must_wrap_return_value =
|
|
compiler.must_wrap_return_value_in_typed_array(&sym.result_type);
|
|
let must_save_preserved_register = must_wrap_return_value;
|
|
let cannot_tailcall = must_cast_return_value || must_wrap_return_value;
|
|
|
|
if cannot_tailcall {
|
|
if must_save_preserved_register {
|
|
compiler.save_preserved_register_to_stack();
|
|
}
|
|
compiler.allocate_stack(&sym.parameter_types);
|
|
}
|
|
|
|
for param in sym.parameter_types.iter().cloned() {
|
|
compiler.move_left(param)
|
|
}
|
|
if !compiler.is_recv_arg_overridden() {
|
|
// the receiver object should never be expected. Avoid its unexpected or deliberate leak
|
|
compiler.zero_first_arg();
|
|
}
|
|
if must_wrap_return_value {
|
|
compiler.save_out_array_to_preserved_register();
|
|
}
|
|
|
|
if cannot_tailcall {
|
|
compiler.call(sym.ptr.as_ptr());
|
|
if must_cast_return_value {
|
|
compiler.cast_return_value(&sym.result_type);
|
|
}
|
|
if must_wrap_return_value {
|
|
compiler.wrap_return_value_in_out_array();
|
|
}
|
|
compiler.deallocate_stack();
|
|
if must_save_preserved_register {
|
|
compiler.recover_preserved_register();
|
|
}
|
|
compiler.ret();
|
|
} else {
|
|
compiler.tailcall(sym.ptr.as_ptr());
|
|
}
|
|
|
|
Trampoline(compiler.finalize())
|
|
}
|
|
|
|
fn move_left(&mut self, param: NativeType) {
|
|
// Section "Parameter Passing" of the Windows x64 calling convention:
|
|
// > By default, the x64 calling convention passes the first four arguments to a function in registers.
|
|
// > The registers used for these arguments depend on the position and type of the argument.
|
|
// > Remaining arguments get pushed on the stack in right-to-left order.
|
|
// > [...]
|
|
// > Integer valued arguments in the leftmost four positions are passed in left-to-right order in RCX, RDX, R8, and R9
|
|
// > [...]
|
|
// > Any floating-point and double-precision arguments in the first four parameters are passed in XMM0 - XMM3, depending on position
|
|
let s = &mut self.assmblr;
|
|
let param_i = self.params;
|
|
|
|
// move each argument one position to the left. The first argument in the stack moves to the last register (r9 or xmm3).
|
|
// If the FFI function is called with a new stack frame, the arguments remaining in the stack are copied to the new stack frame.
|
|
// Otherwise, they are copied 8 bytes lower in the same frame
|
|
match (param_i, param.into()) {
|
|
// Section "Parameter Passing" of the Windows x64 calling convention:
|
|
// > All integer arguments in registers are right-justified, so the callee can ignore the upper bits of the register
|
|
// > and access only the portion of the register necessary.
|
|
// (i.e. unlike in SysV or Aarch64-Apple, 8/16 bit integers are not expected to be zero/sign extended)
|
|
(0, Int(U(B | W | DW) | I(B | W | DW))) => x64!(s; mov ecx, edx),
|
|
(0, Int(U(QW) | I(QW))) => x64!(s; mov rcx, rdx),
|
|
// The fast API expects buffer arguments passed as a pointer to a FastApiTypedArray<Uint8> struct
|
|
// Here we blindly follow the layout of https://github.com/denoland/rusty_v8/blob/main/src/fast_api.rs#L190-L200
|
|
// although that might be problematic: https://discord.com/channels/684898665143206084/956626010248478720/1009450940866252823
|
|
(0, Int(Buffer)) => x64!(s; mov rcx, [rdx + 8]),
|
|
// Use movaps for singles and doubles, benefits of smaller encoding outweigh those of using the correct instruction for the type,
|
|
// which for doubles should technically be movapd
|
|
(0, Float(_)) => {
|
|
x64!(s; movaps xmm0, xmm1);
|
|
self.zero_first_arg();
|
|
}
|
|
|
|
(1, Int(U(B | W | DW) | I(B | W | DW))) => x64!(s; mov edx, r8d),
|
|
(1, Int(U(QW) | I(QW))) => x64!(s; mov rdx, r8),
|
|
(1, Int(Buffer)) => x64!(s; mov rdx, [r8 + 8]),
|
|
(1, Float(_)) => x64!(s; movaps xmm1, xmm2),
|
|
|
|
(2, Int(U(B | W | DW) | I(B | W | DW))) => x64!(s; mov r8d, r9d),
|
|
(2, Int(U(QW) | I(QW))) => x64!(s; mov r8, r9),
|
|
(2, Int(Buffer)) => x64!(s; mov r8, [r9 + 8]),
|
|
(2, Float(_)) => x64!(s; movaps xmm2, xmm3),
|
|
|
|
(3, param) => {
|
|
let ot = self.offset_trampoline as i32;
|
|
match param {
|
|
Int(U(B | W | DW) | I(B | W | DW)) => {
|
|
x64!(s; mov r9d, [rsp + ot])
|
|
}
|
|
Int(U(QW) | I(QW)) => {
|
|
x64!(s; mov r9, [rsp + ot])
|
|
}
|
|
Int(Buffer) => {
|
|
x64!(s
|
|
; mov r9, [rsp + ot]
|
|
; mov r9, [r9 + 8])
|
|
}
|
|
Float(_) => {
|
|
// parameter 4 is always 16-byte aligned, so we can use movaps instead of movups
|
|
x64!(s; movaps xmm3, [rsp + ot])
|
|
}
|
|
}
|
|
// Section "x64 Aggregate and Union layout" of the windows x64 software conventions doc:
|
|
// > The alignment of the beginning of a structure or a union is the maximum alignment of any individual member
|
|
// Ref: https://github.com/MicrosoftDocs/cpp-docs/blob/main/docs/build/x64-software-conventions.md#x64-aggregate-and-union-layout
|
|
self.offset_trampoline += 8;
|
|
}
|
|
(4.., param) => {
|
|
let ot = self.offset_trampoline as i32;
|
|
let oc = self.offset_callee as i32;
|
|
match param {
|
|
Int(U(B | W | DW) | I(B | W | DW)) => {
|
|
x64!(s
|
|
; mov eax, [rsp + ot]
|
|
; mov [rsp + oc], eax
|
|
)
|
|
}
|
|
Int(U(QW) | I(QW)) => {
|
|
x64!(s
|
|
; mov rax, [rsp + ot]
|
|
; mov [rsp + oc], rax
|
|
)
|
|
}
|
|
Int(Buffer) => {
|
|
x64!(s
|
|
; mov rax, [rsp + ot]
|
|
; mov rax, [rax + 8]
|
|
; mov [rsp + oc], rax
|
|
)
|
|
}
|
|
Float(_) => {
|
|
x64!(s
|
|
; movups xmm4, [rsp + ot]
|
|
; movups [rsp + oc], xmm4
|
|
)
|
|
}
|
|
}
|
|
// Section "x64 Aggregate and Union layout" of the windows x64 software conventions doc:
|
|
// > The alignment of the beginning of a structure or a union is the maximum alignment of any individual member
|
|
// Ref: https://github.com/MicrosoftDocs/cpp-docs/blob/main/docs/build/x64-software-conventions.md#x64-aggregate-and-union-layout
|
|
self.offset_trampoline += 8;
|
|
self.offset_callee += 8;
|
|
|
|
debug_assert!(
|
|
self.allocated_stack == 0
|
|
|| self.offset_callee <= self.allocated_stack
|
|
);
|
|
}
|
|
}
|
|
self.params += 1;
|
|
}
|
|
|
|
fn zero_first_arg(&mut self) {
|
|
debug_assert!(
|
|
self.params == 0,
|
|
"the trampoline would zero the first argument after having overridden it with the second one"
|
|
);
|
|
x64!(self.assmblr; xor ecx, ecx);
|
|
}
|
|
|
|
fn cast_return_value(&mut self, rv: &NativeType) {
|
|
let s = &mut self.assmblr;
|
|
// V8 only supports 32bit integers. We support 8 and 16 bit integers casting them to 32bits.
|
|
// Section "Return Values" of the Windows x64 Calling Convention doc:
|
|
// > The state of unused bits in the value returned in RAX or XMM0 is undefined.
|
|
match rv {
|
|
NativeType::U8 => x64!(s; movzx eax, al),
|
|
NativeType::I8 => x64!(s; movsx eax, al),
|
|
NativeType::U16 => x64!(s; movzx eax, ax),
|
|
NativeType::I16 => x64!(s; movsx eax, ax),
|
|
_ => (),
|
|
}
|
|
}
|
|
|
|
fn save_out_array_to_preserved_register(&mut self) {
|
|
let s = &mut self.assmblr;
|
|
// functions returning 64 bit integers have the out array appended as their last parameter,
|
|
// and it is a *FastApiTypedArray<Int32>
|
|
match self.params {
|
|
// rcx is always V8 receiver
|
|
0 => x64!(s; mov rbx, [rdx + 8]),
|
|
1 => x64!(s; mov rbx, [r8 + 8]),
|
|
2 => x64!(s; mov rbx, [r9 + 8]),
|
|
3.. => {
|
|
x64!(s
|
|
; mov rax, [rsp + self.offset_trampoline as i32]
|
|
; mov rbx, [rax + 8]
|
|
)
|
|
}
|
|
}
|
|
}
|
|
|
|
fn wrap_return_value_in_out_array(&mut self) {
|
|
x64!(self.assmblr; mov [rbx], rax)
|
|
}
|
|
|
|
fn save_preserved_register_to_stack(&mut self) {
|
|
x64!(self.assmblr; push rbx);
|
|
self.offset_trampoline += 8;
|
|
// stack pointer has been modified, and the callee stack parameters are expected at the top of the stack
|
|
self.offset_callee = 0;
|
|
self.frame_pointer += 8;
|
|
}
|
|
|
|
fn recover_preserved_register(&mut self) {
|
|
debug_assert!(
|
|
self.frame_pointer >= 8,
|
|
"the trampoline would try to pop from the stack beyond its frame pointer"
|
|
);
|
|
x64!(self.assmblr; pop rbx);
|
|
self.frame_pointer -= 8;
|
|
// parameter offsets are invalid once this method is called
|
|
}
|
|
|
|
fn allocate_stack(&mut self, params: &[NativeType]) {
|
|
let mut stack_size = 0;
|
|
// Section "Calling Convention Defaults" of the x64-calling-convention and Section "Stack Allocation" of the stack-usage docs:
|
|
// > The x64 Application Binary Interface (ABI) uses a four-register fast-call calling convention by default.
|
|
// > Space is allocated on the call stack as a shadow store for callees to save those registers.
|
|
// > [...]
|
|
// > Any parameters beyond the first four must be stored on the stack after the shadow store before the call
|
|
// > [...]
|
|
// > Even if the called function has fewer than 4 parameters, these 4 stack locations are effectively owned by the called function,
|
|
// > and may be used by the called function for other purposes besides saving parameter register values
|
|
stack_size += max(params.len() as u32, 4) * 8;
|
|
|
|
// Align new stack frame (accounting for the 8 byte of the trampoline caller's return address
|
|
// and any other potential addition to the stack prior to this allocation)
|
|
// Section "Stack Allocation" of stack-usage docs:
|
|
// > The stack will always be maintained 16-byte aligned, except within the prolog (for example, after the return address is pushed)
|
|
stack_size += padding_to_align(16, self.frame_pointer + stack_size + 8);
|
|
|
|
x64!(self.assmblr; sub rsp, stack_size as i32);
|
|
self.offset_trampoline += stack_size;
|
|
// stack pointer has been modified, and the callee stack parameters are expected at the top of the stack right after the shadow space
|
|
self.offset_callee = 32;
|
|
self.allocated_stack += stack_size;
|
|
self.frame_pointer += stack_size;
|
|
}
|
|
|
|
fn deallocate_stack(&mut self) {
|
|
debug_assert!(
|
|
self.frame_pointer >= self.allocated_stack,
|
|
"the trampoline would try to deallocate stack beyond its frame pointer"
|
|
);
|
|
x64!(self.assmblr; add rsp, self.allocated_stack as i32);
|
|
self.frame_pointer -= self.allocated_stack;
|
|
self.allocated_stack = 0;
|
|
}
|
|
|
|
fn call(&mut self, ptr: *const c_void) {
|
|
// the stack has been aligned during stack allocation and/or pushing of preserved registers
|
|
debug_assert!(
|
|
(8 + self.frame_pointer) % 16 == 0,
|
|
"the trampoline would call the FFI function with an unaligned stack"
|
|
);
|
|
x64!(self.assmblr
|
|
; mov rax, QWORD ptr as _
|
|
; call rax
|
|
);
|
|
}
|
|
|
|
fn tailcall(&mut self, ptr: *const c_void) {
|
|
// stack pointer is never modified and remains aligned
|
|
// return address remains the one provided by the trampoline's caller (V8)
|
|
debug_assert!(
|
|
self.allocated_stack == 0,
|
|
"the trampoline would tail call the FFI function with an outstanding stack allocation"
|
|
);
|
|
debug_assert!(
|
|
self.frame_pointer == 0,
|
|
"the trampoline would tail call the FFI function with outstanding locals in the frame"
|
|
);
|
|
x64!(self.assmblr
|
|
; mov rax, QWORD ptr as _
|
|
; jmp rax
|
|
);
|
|
}
|
|
|
|
fn ret(&mut self) {
|
|
debug_assert!(
|
|
self.allocated_stack == 0,
|
|
"the trampoline would return with an outstanding stack allocation"
|
|
);
|
|
debug_assert!(
|
|
self.frame_pointer == 0,
|
|
"the trampoline would return with outstanding locals in the frame"
|
|
);
|
|
x64!(self.assmblr; ret);
|
|
}
|
|
|
|
fn is_recv_arg_overridden(&self) -> bool {
|
|
self.params > 0
|
|
}
|
|
|
|
fn must_cast_return_value(&self, rv: &NativeType) -> bool {
|
|
// V8 only supports i32 and u32 return types for integers
|
|
// We support 8 and 16 bit integers by extending them to 32 bits in the trampoline before returning
|
|
matches!(
|
|
rv,
|
|
NativeType::U8 | NativeType::I8 | NativeType::U16 | NativeType::I16
|
|
)
|
|
}
|
|
|
|
fn must_wrap_return_value_in_typed_array(&self, rv: &NativeType) -> bool {
|
|
// V8 only supports i32 and u32 return types for integers
|
|
// We support 64 bit integers by wrapping them in a TypedArray out parameter
|
|
crate::dlfcn::needs_unwrap(rv)
|
|
}
|
|
|
|
fn finalize(self) -> ExecutableBuffer {
|
|
self.assmblr.finalize().unwrap()
|
|
}
|
|
}
|
|
|
|
fn padding_to_align(alignment: u32, size: u32) -> u32 {
|
|
(alignment - size % alignment) % alignment
|
|
}
|
|
|
|
#[derive(Clone, Copy, Debug)]
|
|
enum Floating {
|
|
Single = 4,
|
|
Double = 8,
|
|
}
|
|
|
|
impl Floating {
|
|
fn size(self) -> u32 {
|
|
self as u32
|
|
}
|
|
}
|
|
|
|
use Floating::*;
|
|
|
|
#[derive(Clone, Copy, Debug)]
|
|
enum Integral {
|
|
I(Size),
|
|
U(Size),
|
|
Buffer,
|
|
}
|
|
|
|
impl Integral {
|
|
fn size(self) -> u32 {
|
|
match self {
|
|
I(size) | U(size) => size as u32,
|
|
Buffer => 8,
|
|
}
|
|
}
|
|
}
|
|
|
|
use Integral::*;
|
|
|
|
#[derive(Clone, Copy, Debug)]
|
|
enum Size {
|
|
B = 1,
|
|
W = 2,
|
|
DW = 4,
|
|
QW = 8,
|
|
}
|
|
use Size::*;
|
|
|
|
#[allow(clippy::enum_variant_names)]
|
|
#[derive(Clone, Copy, Debug)]
|
|
enum Param {
|
|
Int(Integral),
|
|
Float(Floating),
|
|
}
|
|
|
|
use Param::*;
|
|
|
|
impl From<NativeType> for Param {
|
|
fn from(native: NativeType) -> Self {
|
|
match native {
|
|
NativeType::F32 => Float(Single),
|
|
NativeType::F64 => Float(Double),
|
|
NativeType::Bool | NativeType::U8 => Int(U(B)),
|
|
NativeType::U16 => Int(U(W)),
|
|
NativeType::U32 | NativeType::Void => Int(U(DW)),
|
|
NativeType::U64
|
|
| NativeType::USize
|
|
| NativeType::Pointer
|
|
| NativeType::Function => Int(U(QW)),
|
|
NativeType::I8 => Int(I(B)),
|
|
NativeType::I16 => Int(I(W)),
|
|
NativeType::I32 => Int(I(DW)),
|
|
NativeType::I64 | NativeType::ISize => Int(I(QW)),
|
|
NativeType::Buffer => Int(Buffer),
|
|
NativeType::Struct(_) => unimplemented!(),
|
|
}
|
|
}
|
|
}
|
|
|
|
#[cfg(test)]
|
|
mod tests {
|
|
use std::ptr::null_mut;
|
|
|
|
use libffi::middle::Type;
|
|
|
|
use crate::NativeType;
|
|
use crate::Symbol;
|
|
|
|
fn symbol(parameters: Vec<NativeType>, ret: NativeType) -> Symbol {
|
|
Symbol {
|
|
cif: libffi::middle::Cif::new(vec![], Type::void()),
|
|
ptr: libffi::middle::CodePtr(null_mut()),
|
|
parameter_types: parameters,
|
|
result_type: ret,
|
|
can_callback: false,
|
|
}
|
|
}
|
|
|
|
mod sysv_amd64 {
|
|
use std::ops::Deref;
|
|
|
|
use dynasmrt::dynasm;
|
|
use dynasmrt::DynasmApi;
|
|
|
|
use super::super::SysVAmd64;
|
|
use super::symbol;
|
|
use crate::NativeType::*;
|
|
|
|
#[test]
|
|
fn tailcall() {
|
|
let trampoline = SysVAmd64::compile(&symbol(
|
|
vec![
|
|
U8, U16, I16, I8, U32, U64, Buffer, Function, I64, I32, I16, I8, F32,
|
|
F32, F32, F32, F64, F64, F64, F64, F32, F64,
|
|
],
|
|
Void,
|
|
));
|
|
|
|
let mut assembler = dynasmrt::x64::Assembler::new().unwrap();
|
|
// See https://godbolt.org/z/KE9x1h9xq
|
|
dynasm!(assembler
|
|
; .arch x64
|
|
; movzx edi, sil // u8
|
|
; movzx esi, dx // u16
|
|
; movsx edx, cx // i16
|
|
; movsx ecx, r8b // i8
|
|
; mov r8d, r9d // u32
|
|
; mov r9, [DWORD rsp + 8] // u64
|
|
; mov rax, [DWORD rsp + 16] // Buffer
|
|
; mov rax, [rax + 8] // ..
|
|
; mov [DWORD rsp + 8], rax // ..
|
|
; mov rax, [DWORD rsp + 24] // Function
|
|
; mov [DWORD rsp + 16], rax // ..
|
|
; mov rax, [DWORD rsp + 32] // i64
|
|
; mov [DWORD rsp + 24], rax // ..
|
|
; mov eax, [DWORD rsp + 40] // i32
|
|
; mov [DWORD rsp + 32], eax // ..
|
|
; movsx eax, WORD [DWORD rsp + 48] // i16
|
|
; mov [DWORD rsp + 40], eax // ..
|
|
; movsx eax, BYTE [DWORD rsp + 56] // i8
|
|
; mov [DWORD rsp + 48], eax // ..
|
|
; movss xmm8, [DWORD rsp + 64] // f32
|
|
; movss [DWORD rsp + 56], xmm8 // ..
|
|
; movsd xmm8, [DWORD rsp + 72] // f64
|
|
; movsd [DWORD rsp + 64], xmm8 // ..
|
|
; mov rax, QWORD 0
|
|
; jmp rax
|
|
);
|
|
let expected = assembler.finalize().unwrap();
|
|
assert_eq!(trampoline.0.deref(), expected.deref());
|
|
}
|
|
|
|
#[test]
|
|
fn integer_casting() {
|
|
let trampoline = SysVAmd64::compile(&symbol(
|
|
vec![U8, U16, I8, I16, U8, U16, I8, I16, U8, U16, I8, I16],
|
|
I8,
|
|
));
|
|
|
|
let mut assembler = dynasmrt::x64::Assembler::new().unwrap();
|
|
// See https://godbolt.org/z/qo59bPsfv
|
|
dynasm!(assembler
|
|
; .arch x64
|
|
; sub rsp, DWORD 56 // stack allocation
|
|
; movzx edi, sil // u8
|
|
; movzx esi, dx // u16
|
|
; movsx edx, cl // i8
|
|
; movsx ecx, r8w // i16
|
|
; movzx r8d, r9b // u8
|
|
; movzx r9d, WORD [DWORD rsp + 64] // u16
|
|
; movsx eax, BYTE [DWORD rsp + 72] // i8
|
|
; mov [DWORD rsp + 0], eax // ..
|
|
; movsx eax, WORD [DWORD rsp + 80] // i16
|
|
; mov [DWORD rsp + 8], eax // ..
|
|
; movzx eax, BYTE [DWORD rsp + 88] // u8
|
|
; mov [DWORD rsp + 16], eax // ..
|
|
; movzx eax, WORD [DWORD rsp + 96] // u16
|
|
; mov [DWORD rsp + 24], eax // ..
|
|
; movsx eax, BYTE [DWORD rsp + 104] // i8
|
|
; mov [DWORD rsp + 32], eax // ..
|
|
; movsx eax, WORD [DWORD rsp + 112] // i16
|
|
; mov [DWORD rsp + 40], eax // ..
|
|
; mov rax, QWORD 0
|
|
; call rax
|
|
; movsx eax, al // return value cast
|
|
; add rsp, DWORD 56 // stack deallocation
|
|
; ret
|
|
);
|
|
let expected = assembler.finalize().unwrap();
|
|
assert_eq!(trampoline.0.deref(), expected.deref());
|
|
}
|
|
|
|
#[test]
|
|
fn buffer_parameters() {
|
|
let trampoline = SysVAmd64::compile(&symbol(
|
|
vec![
|
|
Buffer, Buffer, Buffer, Buffer, Buffer, Buffer, Buffer, Buffer,
|
|
],
|
|
Void,
|
|
));
|
|
|
|
let mut assembler = dynasmrt::x64::Assembler::new().unwrap();
|
|
// See https://godbolt.org/z/hqv63M3Ko
|
|
dynasm!(assembler
|
|
; .arch x64
|
|
; mov rdi, [rsi + 8] // Buffer
|
|
; mov rsi, [rdx + 8] // Buffer
|
|
; mov rdx, [rcx + 8] // Buffer
|
|
; mov rcx, [r8 + 8] // Buffer
|
|
; mov r8, [r9 + 8] // Buffer
|
|
; mov r9, [DWORD rsp + 8] // Buffer
|
|
; mov r9, [r9 + 8] // ..
|
|
; mov rax, [DWORD rsp + 16] // Buffer
|
|
; mov rax, [rax + 8] // ..
|
|
; mov [DWORD rsp + 8], rax // ..
|
|
; mov rax, [DWORD rsp + 24] // Buffer
|
|
; mov rax, [rax + 8] // ..
|
|
; mov [DWORD rsp + 16], rax // ..
|
|
; mov rax, QWORD 0
|
|
; jmp rax
|
|
);
|
|
let expected = assembler.finalize().unwrap();
|
|
assert_eq!(trampoline.0.deref(), expected.deref());
|
|
}
|
|
|
|
#[test]
|
|
fn return_u64_in_register_typed_array() {
|
|
let trampoline = SysVAmd64::compile(&symbol(vec![], U64));
|
|
|
|
let mut assembler = dynasmrt::x64::Assembler::new().unwrap();
|
|
// See https://godbolt.org/z/8G7a488o7
|
|
dynasm!(assembler
|
|
; .arch x64
|
|
; push rbx
|
|
; xor edi, edi // recv
|
|
; mov rbx, [rsi + 8] // save data array pointer to non-volatile register
|
|
; mov rax, QWORD 0
|
|
; call rax
|
|
; mov [rbx], rax // copy return value to data pointer address
|
|
; pop rbx
|
|
; ret
|
|
);
|
|
let expected = assembler.finalize().unwrap();
|
|
assert_eq!(trampoline.0.deref(), expected.deref());
|
|
}
|
|
|
|
#[test]
|
|
fn return_u64_in_stack_typed_array() {
|
|
let trampoline = SysVAmd64::compile(&symbol(
|
|
vec![U64, U64, U64, U64, U64, U64, U64],
|
|
U64,
|
|
));
|
|
|
|
let mut assembler = dynasmrt::x64::Assembler::new().unwrap();
|
|
// See https://godbolt.org/z/cPnPYWdWq
|
|
dynasm!(assembler
|
|
; .arch x64
|
|
; push rbx
|
|
; sub rsp, DWORD 16
|
|
; mov rdi, rsi // u64
|
|
; mov rsi, rdx // u64
|
|
; mov rdx, rcx // u64
|
|
; mov rcx, r8 // u64
|
|
; mov r8, r9 // u64
|
|
; mov r9, [DWORD rsp + 32] // u64
|
|
; mov rax, [DWORD rsp + 40] // u64
|
|
; mov [DWORD rsp + 0], rax // ..
|
|
; mov rax, [DWORD rsp + 48] // save data array pointer to non-volatile register
|
|
; mov rbx, [rax + 8] // ..
|
|
; mov rax, QWORD 0
|
|
; call rax
|
|
; mov [rbx], rax // copy return value to data pointer address
|
|
; add rsp, DWORD 16
|
|
; pop rbx
|
|
; ret
|
|
);
|
|
let expected = assembler.finalize().unwrap();
|
|
assert_eq!(trampoline.0.deref(), expected.deref());
|
|
}
|
|
}
|
|
|
|
mod aarch64_apple {
|
|
use std::ops::Deref;
|
|
|
|
use dynasmrt::dynasm;
|
|
|
|
use super::super::Aarch64Apple;
|
|
use super::symbol;
|
|
use crate::NativeType::*;
|
|
|
|
#[test]
|
|
fn tailcall() {
|
|
let trampoline = Aarch64Apple::compile(&symbol(
|
|
vec![
|
|
U8, U16, I16, I8, U32, U64, Buffer, Function, I64, I32, I16, I8, F32,
|
|
F32, F32, F32, F64, F64, F64, F64, F32, F64,
|
|
],
|
|
Void,
|
|
));
|
|
|
|
let mut assembler = dynasmrt::aarch64::Assembler::new().unwrap();
|
|
// See https://godbolt.org/z/oefqYWT13
|
|
dynasm!(assembler
|
|
; .arch aarch64
|
|
; and w0, w1, 0xFF // u8
|
|
; and w1, w2, 0xFFFF // u16
|
|
; sxth w2, w3 // i16
|
|
; sxtb w3, w4 // i8
|
|
; mov w4, w5 // u32
|
|
; mov x5, x6 // u64
|
|
; ldr x6, [x7, 8] // Buffer
|
|
; ldr x7, [sp] // Function
|
|
; ldr x8, [sp, 8] // i64
|
|
; str x8, [sp] // ..
|
|
; ldr w8, [sp, 16] // i32
|
|
; str w8, [sp, 8] // ..
|
|
; ldr w8, [sp, 24] // i16
|
|
; strh w8, [sp, 12] // ..
|
|
; ldr w8, [sp, 32] // i8
|
|
; strb w8, [sp, 14] // ..
|
|
; ldr s16, [sp, 40] // f32
|
|
; str s16, [sp, 16] // ..
|
|
; ldr d16, [sp, 48] // f64
|
|
; str d16, [sp, 24] // ..
|
|
; movz x8, 0
|
|
; br x8
|
|
);
|
|
let expected = assembler.finalize().unwrap();
|
|
assert_eq!(trampoline.0.deref(), expected.deref());
|
|
}
|
|
|
|
#[test]
|
|
fn integer_casting() {
|
|
let trampoline = Aarch64Apple::compile(&symbol(
|
|
vec![U8, U16, I8, I16, U8, U16, I8, I16, U8, U16, I8, I16],
|
|
I8,
|
|
));
|
|
|
|
let mut assembler = dynasmrt::aarch64::Assembler::new().unwrap();
|
|
// See https://godbolt.org/z/7qfzbzobM
|
|
dynasm!(assembler
|
|
; .arch aarch64
|
|
; and w0, w1, 0xFF // u8
|
|
; and w1, w2, 0xFFFF // u16
|
|
; sxtb w2, w3 // i8
|
|
; sxth w3, w4 // i16
|
|
; and w4, w5, 0xFF // u8
|
|
; and w5, w6, 0xFFFF // u16
|
|
; sxtb w6, w7 // i8
|
|
; ldrsh w7, [sp] // i16
|
|
; ldr w8, [sp, 8] // u8
|
|
; strb w8, [sp] // ..
|
|
; ldr w8, [sp, 16] // u16
|
|
; strh w8, [sp, 2] // ..
|
|
; ldr w8, [sp, 24] // i8
|
|
; strb w8, [sp, 4] // ..
|
|
; ldr w8, [sp, 32] // i16
|
|
; strh w8, [sp, 6] // ..
|
|
; movz x8, 0
|
|
; br x8
|
|
);
|
|
let expected = assembler.finalize().unwrap();
|
|
assert_eq!(trampoline.0.deref(), expected.deref());
|
|
}
|
|
|
|
#[test]
|
|
fn buffer_parameters() {
|
|
let trampoline = Aarch64Apple::compile(&symbol(
|
|
vec![
|
|
Buffer, Buffer, Buffer, Buffer, Buffer, Buffer, Buffer, Buffer,
|
|
Buffer, Buffer,
|
|
],
|
|
Void,
|
|
));
|
|
|
|
let mut assembler = dynasmrt::aarch64::Assembler::new().unwrap();
|
|
// See https://godbolt.org/z/obd6z6vsf
|
|
dynasm!(assembler
|
|
; .arch aarch64
|
|
; ldr x0, [x1, 8] // Buffer
|
|
; ldr x1, [x2, 8] // Buffer
|
|
; ldr x2, [x3, 8] // Buffer
|
|
; ldr x3, [x4, 8] // Buffer
|
|
; ldr x4, [x5, 8] // Buffer
|
|
; ldr x5, [x6, 8] // Buffer
|
|
; ldr x6, [x7, 8] // Buffer
|
|
; ldr x7, [sp] // Buffer
|
|
; ldr x7, [x7, 8] // ..
|
|
; ldr x8, [sp, 8] // Buffer
|
|
; ldr x8, [x8, 8] // ..
|
|
; str x8, [sp] // ..
|
|
; ldr x8, [sp, 16] // Buffer
|
|
; ldr x8, [x8, 8] // ..
|
|
; str x8, [sp, 8] // ..
|
|
; movz x8, 0
|
|
; br x8
|
|
);
|
|
let expected = assembler.finalize().unwrap();
|
|
assert_eq!(trampoline.0.deref(), expected.deref());
|
|
}
|
|
|
|
#[test]
|
|
fn return_u64_in_register_typed_array() {
|
|
let trampoline = Aarch64Apple::compile(&symbol(vec![], U64));
|
|
|
|
let mut assembler = dynasmrt::aarch64::Assembler::new().unwrap();
|
|
// See https://godbolt.org/z/47EvvYb83
|
|
dynasm!(assembler
|
|
; .arch aarch64
|
|
; sub sp, sp, 32
|
|
; stp x29, x30, [sp, 16]
|
|
; add x29, sp, 16
|
|
; str x19, [sp, 8]
|
|
; mov x0, xzr // recv
|
|
; ldr x19, [x1, 8] // save data array pointer to non-volatile register
|
|
; movz x8, 0
|
|
; blr x8
|
|
; str x0, [x19] // copy return value to data pointer address
|
|
; ldr x19, [sp, 8]
|
|
; ldp x29, x30, [sp, 16]
|
|
; add sp, sp, 32
|
|
; ret
|
|
);
|
|
let expected = assembler.finalize().unwrap();
|
|
assert_eq!(trampoline.0.deref(), expected.deref());
|
|
}
|
|
|
|
#[test]
|
|
fn return_u64_in_stack_typed_array() {
|
|
let trampoline = Aarch64Apple::compile(&symbol(
|
|
vec![U64, U64, U64, U64, U64, U64, U64, U64, U8, U8],
|
|
U64,
|
|
));
|
|
|
|
let mut assembler = dynasmrt::aarch64::Assembler::new().unwrap();
|
|
// See https://godbolt.org/z/PvYPbsE1b
|
|
dynasm!(assembler
|
|
; .arch aarch64
|
|
; sub sp, sp, 32
|
|
; stp x29, x30, [sp, 16]
|
|
; add x29, sp, 16
|
|
; str x19, [sp, 8]
|
|
; mov x0, x1 // u64
|
|
; mov x1, x2 // u64
|
|
; mov x2, x3 // u64
|
|
; mov x3, x4 // u64
|
|
; mov x4, x5 // u64
|
|
; mov x5, x6 // u64
|
|
; mov x6, x7 // u64
|
|
; ldr x7, [sp, 32] // u64
|
|
; ldr w8, [sp, 40] // u8
|
|
; strb w8, [sp] // ..
|
|
; ldr w8, [sp, 48] // u8
|
|
; strb w8, [sp, 1] // ..
|
|
; ldr x19, [sp, 56] // save data array pointer to non-volatile register
|
|
; ldr x19, [x19, 8] // ..
|
|
; movz x8, 0
|
|
; blr x8
|
|
; str x0, [x19] // copy return value to data pointer address
|
|
; ldr x19, [sp, 8]
|
|
; ldp x29, x30, [sp, 16]
|
|
; add sp, sp, 32
|
|
; ret
|
|
);
|
|
let expected = assembler.finalize().unwrap();
|
|
assert_eq!(trampoline.0.deref(), expected.deref());
|
|
}
|
|
}
|
|
|
|
mod x64_windows {
|
|
use std::ops::Deref;
|
|
|
|
use dynasmrt::dynasm;
|
|
use dynasmrt::DynasmApi;
|
|
|
|
use super::super::Win64;
|
|
use super::symbol;
|
|
use crate::NativeType::*;
|
|
|
|
#[test]
|
|
fn tailcall() {
|
|
let trampoline =
|
|
Win64::compile(&symbol(vec![U8, I16, F64, F32, U32, I8, Buffer], Void));
|
|
|
|
let mut assembler = dynasmrt::x64::Assembler::new().unwrap();
|
|
// See https://godbolt.org/z/TYzqrf9aj
|
|
dynasm!(assembler
|
|
; .arch x64
|
|
; mov ecx, edx // u8
|
|
; mov edx, r8d // i16
|
|
; movaps xmm2, xmm3 // f64
|
|
; movaps xmm3, [DWORD rsp + 40] // f32
|
|
; mov eax, [DWORD rsp + 48] // u32
|
|
; mov [DWORD rsp + 40], eax // ..
|
|
; mov eax, [DWORD rsp + 56] // i8
|
|
; mov [DWORD rsp + 48], eax // ..
|
|
; mov rax, [DWORD rsp + 64] // Buffer
|
|
; mov rax, [rax + 8] // ..
|
|
; mov [DWORD rsp + 56], rax // ..
|
|
; mov rax, QWORD 0
|
|
; jmp rax
|
|
);
|
|
let expected = assembler.finalize().unwrap();
|
|
assert_eq!(trampoline.0.deref(), expected.deref());
|
|
}
|
|
|
|
#[test]
|
|
fn integer_casting() {
|
|
let trampoline = Win64::compile(&symbol(
|
|
vec![U8, U16, I8, I16, U8, U16, I8, I16, U8, U16, I8, I16],
|
|
I8,
|
|
));
|
|
|
|
let mut assembler = dynasmrt::x64::Assembler::new().unwrap();
|
|
// See https://godbolt.org/z/KMx56KGTq
|
|
dynasm!(assembler
|
|
; .arch x64
|
|
; sub rsp, DWORD 104 // stack allocation
|
|
; mov ecx, edx // u8
|
|
; mov edx, r8d // u16
|
|
; mov r8d, r9d // i8
|
|
; mov r9d, [DWORD rsp + 144] // i16
|
|
; mov eax, [DWORD rsp + 152] // u8
|
|
; mov [DWORD rsp + 32], eax // ..
|
|
; mov eax, [DWORD rsp + 160] // u16
|
|
; mov [DWORD rsp + 40], eax // u16
|
|
; mov eax, [DWORD rsp + 168] // i8
|
|
; mov [DWORD rsp + 48], eax // ..
|
|
; mov eax, [DWORD rsp + 176] // i16
|
|
; mov [DWORD rsp + 56], eax // ..
|
|
; mov eax, [DWORD rsp + 184] // u8
|
|
; mov [DWORD rsp + 64], eax // ..
|
|
; mov eax, [DWORD rsp + 192] // u16
|
|
; mov [DWORD rsp + 72], eax // ..
|
|
; mov eax, [DWORD rsp + 200] // i8
|
|
; mov [DWORD rsp + 80], eax // ..
|
|
; mov eax, [DWORD rsp + 208] // i16
|
|
; mov [DWORD rsp + 88], eax // ..
|
|
; mov rax, QWORD 0
|
|
; call rax
|
|
; movsx eax, al // return value cast
|
|
; add rsp, DWORD 104 // stack deallocation
|
|
; ret
|
|
);
|
|
let expected = assembler.finalize().unwrap();
|
|
assert_eq!(trampoline.0.deref(), expected.deref());
|
|
}
|
|
|
|
#[test]
|
|
fn buffer_parameters() {
|
|
let trampoline = Win64::compile(&symbol(
|
|
vec![Buffer, Buffer, Buffer, Buffer, Buffer, Buffer],
|
|
Void,
|
|
));
|
|
|
|
let mut assembler = dynasmrt::x64::Assembler::new().unwrap();
|
|
// See https://godbolt.org/z/TYzqrf9aj
|
|
dynasm!(assembler
|
|
; .arch x64
|
|
; mov rcx, [rdx + 8] // Buffer
|
|
; mov rdx, [r8 + 8] // Buffer
|
|
; mov r8, [r9 + 8] // Buffer
|
|
; mov r9, [DWORD rsp + 40] // Buffer
|
|
; mov r9, [r9 + 8] // ..
|
|
; mov rax, [DWORD rsp + 48] // Buffer
|
|
; mov rax, [rax + 8] // ..
|
|
; mov [DWORD rsp + 40], rax // ..
|
|
; mov rax, [DWORD rsp + 56] // Buffer
|
|
; mov rax, [rax + 8] // ..
|
|
; mov [DWORD rsp + 48], rax // ..
|
|
; mov rax, QWORD 0
|
|
; jmp rax
|
|
);
|
|
let expected = assembler.finalize().unwrap();
|
|
assert_eq!(trampoline.0.deref(), expected.deref());
|
|
}
|
|
|
|
#[test]
|
|
fn return_u64_in_register_typed_array() {
|
|
let trampoline = Win64::compile(&symbol(vec![], U64));
|
|
|
|
let mut assembler = dynasmrt::x64::Assembler::new().unwrap();
|
|
// See https://godbolt.org/z/7EnPE7o3T
|
|
dynasm!(assembler
|
|
; .arch x64
|
|
; push rbx
|
|
; sub rsp, DWORD 32
|
|
; xor ecx, ecx // recv
|
|
; mov rbx, [rdx + 8] // save data array pointer to non-volatile register
|
|
; mov rax, QWORD 0
|
|
; call rax
|
|
; mov [rbx], rax // copy return value to data pointer address
|
|
; add rsp, DWORD 32
|
|
; pop rbx
|
|
; ret
|
|
);
|
|
let expected = assembler.finalize().unwrap();
|
|
assert_eq!(trampoline.0.deref(), expected.deref());
|
|
}
|
|
|
|
#[test]
|
|
fn return_u64_in_stack_typed_array() {
|
|
let trampoline =
|
|
Win64::compile(&symbol(vec![U64, U64, U64, U64, U64], U64));
|
|
|
|
let mut assembler = dynasmrt::x64::Assembler::new().unwrap();
|
|
// See https://godbolt.org/z/3966sfEex
|
|
dynasm!(assembler
|
|
; .arch x64
|
|
; push rbx
|
|
; sub rsp, DWORD 48
|
|
; mov rcx, rdx // u64
|
|
; mov rdx, r8 // u64
|
|
; mov r8, r9 // u64
|
|
; mov r9, [DWORD rsp + 96] // u64
|
|
; mov rax, [DWORD rsp + 104] // u64
|
|
; mov [DWORD rsp + 32], rax // ..
|
|
; mov rax, [DWORD rsp + 112] // save data array pointer to non-volatile register
|
|
; mov rbx, [rax + 8] // ..
|
|
; mov rax, QWORD 0
|
|
; call rax
|
|
; mov [rbx], rax // copy return value to data pointer address
|
|
; add rsp, DWORD 48
|
|
; pop rbx
|
|
; ret
|
|
);
|
|
let expected = assembler.finalize().unwrap();
|
|
assert_eq!(trampoline.0.deref(), expected.deref());
|
|
}
|
|
}
|
|
}
|