add windows exception handling in C (#175)

This commit is contained in:
Mackenzie Clark
2019-02-14 09:58:33 -08:00
committed by GitHub
parent 0d7b5c8af6
commit 6a1fdb7f91
21 changed files with 630 additions and 32 deletions

View File

@ -29,4 +29,5 @@ build_script:
test_script:
- set RUST_BACKTRACE=1
- cargo test --verbose
- cd ./lib/spectests && cargo test -- --test-threads 1 && cd ../..

290
Cargo.lock generated
View File

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View File

@ -27,7 +27,7 @@ wasmer-runtime-core = { path = "lib/runtime-core" }
wasmer-emscripten = { path = "lib/emscripten" }
[workspace]
members = ["lib/clif-backend", "lib/runtime", "lib/runtime-core", "lib/emscripten", "lib/spectests"]
members = ["lib/clif-backend", "lib/runtime", "lib/runtime-core", "lib/emscripten", "lib/spectests", "lib/win-exception-handler"]
[build-dependencies]
wabt = "0.7.2"

View File

@ -47,10 +47,10 @@ Wasmer is structured into different directories:
Building wasmer requires [rustup](https://rustup.rs/).
To install on Windows, download and run [`rustup-init.exe`](https://win.rustup.rs/)
To build on Windows, download and run [`rustup-init.exe`](https://win.rustup.rs/)
then follow the onscreen instructions.
To install on other systems, run:
To build on other systems, run:
```sh
curl https://sh.rustup.rs -sSf | sh
@ -86,8 +86,8 @@ sudo apt install cmake
#### Windows (MSVC)
Right now Windows support is _highly experimental_.
We are working on this so Wasmer can soon be released for Windows.
Windows support is _highly experimental_. Only simple wasm programs may be run, and no syscalls are allowed. This means
nginx and lua do not work on Windows. See [this issue for ongoing Emscripten syscall polyfills for Windows](https://github.com/wasmerio/wasmer/pull/176).
1. Install Python for Windows (https://www.python.org/downloads/release/python-2714/). The Windows x86-64 MSI installer is fine.
You should change the installation to install the "Add python.exe to Path" feature.
@ -95,6 +95,8 @@ We are working on this so Wasmer can soon be released for Windows.
2. Install Git for Windows (https://git-scm.com/download/win). DO allow it to add git.exe to the PATH (default
settings for the installer are fine).
3. Install CMake (https://cmake.org/download/). Ensure CMake is in the PATH.
## Building
Wasmer is built with [Cargo](https://crates.io/), the Rust package manager.

View File

@ -37,6 +37,10 @@ optional = true
version = "0.0.7"
optional = true
[target.'cfg(windows)'.dependencies]
winapi = { version = "0.3", features = ["errhandlingapi", "minwindef", "minwinbase", "winnt"] }
wasmer-win-exception-handler = { path = "../win-exception-handler", version = "0.0.1" }
[features]
cache = ["serde", "serde_derive", "serde_bytes", "serde-bench", "wasmer-runtime-core/cache"]
debug = ["wasmer-runtime-core/debug"]

View File

@ -223,9 +223,9 @@ impl FuncResolverBuilder {
LibCall::TruncF64 => libcalls::truncf64 as isize,
LibCall::NearestF64 => libcalls::nearbyintf64 as isize,
#[cfg(all(target_pointer_width = "64", target_os = "windows"))]
Probestack => __chkstk as isize,
LibCall::Probestack => __chkstk as isize,
#[cfg(not(target_os = "windows"))]
Probestack => __rust_probestack as isize,
LibCall::Probestack => __rust_probestack as isize,
},
RelocationType::Intrinsic(ref name) => match name.as_str() {
"i32print" => i32_print as isize,

View File

@ -110,6 +110,7 @@ impl ProtectedCaller for Caller {
.lookup(sig_index)
.expect("that trampoline doesn't exist");
#[cfg(not(target_os = "windows"))]
call_protected(&self.handler_data, || unsafe {
// Leap of faith.
trampoline(
@ -120,6 +121,17 @@ impl ProtectedCaller for Caller {
);
})?;
// the trampoline is called from C on windows
#[cfg(target_os = "windows")]
call_protected(
&self.handler_data,
trampoline,
vmctx_ptr,
func_ptr,
param_vec.as_ptr(),
return_vec.as_mut_ptr(),
)?;
Ok(return_vec
.iter()
.zip(signature.returns().iter())

View File

@ -1,10 +1,116 @@
use crate::relocation::{TrapCode, TrapData};
use crate::signal::HandlerData;
use wasmer_runtime_core::error::RuntimeResult;
use crate::trampoline::Trampoline;
use std::cell::Cell;
use std::ffi::c_void;
use std::ptr;
use wasmer_runtime_core::vm::Ctx;
use wasmer_runtime_core::vm::Func;
use wasmer_runtime_core::{
error::{RuntimeError, RuntimeResult},
structures::TypedIndex,
types::{MemoryIndex, TableIndex},
};
use wasmer_win_exception_handler::CallProtectedData;
pub use wasmer_win_exception_handler::_call_protected;
use winapi::shared::minwindef::DWORD;
use winapi::um::minwinbase::{
EXCEPTION_ACCESS_VIOLATION, EXCEPTION_FLT_DENORMAL_OPERAND, EXCEPTION_FLT_DIVIDE_BY_ZERO,
EXCEPTION_FLT_INEXACT_RESULT, EXCEPTION_FLT_INVALID_OPERATION, EXCEPTION_FLT_OVERFLOW,
EXCEPTION_FLT_STACK_CHECK, EXCEPTION_FLT_UNDERFLOW, EXCEPTION_ILLEGAL_INSTRUCTION,
EXCEPTION_INT_DIVIDE_BY_ZERO, EXCEPTION_INT_OVERFLOW, EXCEPTION_STACK_OVERFLOW,
};
pub fn call_protected<T>(handler_data: &HandlerData, f: impl FnOnce() -> T) -> RuntimeResult<T> {
unimplemented!("TODO");
thread_local! {
pub static CURRENT_EXECUTABLE_BUFFER: Cell<*const c_void> = Cell::new(ptr::null());
}
pub fn call_protected(
handler_data: &HandlerData,
trampoline: Trampoline,
ctx: *mut Ctx,
func: *const Func,
param_vec: *const u64,
return_vec: *mut u64,
) -> RuntimeResult<()> {
// TODO: trap early
// user code error
// if let Some(msg) = super::TRAP_EARLY_DATA.with(|cell| cell.replace(None)) {
// return Err(RuntimeError::User { msg });
// }
let result = _call_protected(trampoline, ctx, func, param_vec, return_vec);
if let Ok(_) = result {
return Ok(());
}
let CallProtectedData {
code: signum,
exceptionAddress: exception_address,
instructionPointer: instruction_pointer,
} = result.unwrap_err();
if let Some(TrapData {
trapcode,
srcloc: _,
}) = handler_data.lookup(instruction_pointer as _)
{
Err(match signum as DWORD {
EXCEPTION_ACCESS_VIOLATION => RuntimeError::OutOfBoundsAccess {
memory: MemoryIndex::new(0),
addr: None,
},
EXCEPTION_ILLEGAL_INSTRUCTION => match trapcode {
TrapCode::BadSignature => RuntimeError::IndirectCallSignature {
table: TableIndex::new(0),
},
TrapCode::IndirectCallToNull => RuntimeError::IndirectCallToNull {
table: TableIndex::new(0),
},
TrapCode::HeapOutOfBounds => RuntimeError::OutOfBoundsAccess {
memory: MemoryIndex::new(0),
addr: None,
},
TrapCode::TableOutOfBounds => RuntimeError::TableOutOfBounds {
table: TableIndex::new(0),
},
_ => RuntimeError::Unknown {
msg: "unknown trap".to_string(),
},
},
EXCEPTION_STACK_OVERFLOW => RuntimeError::Unknown {
msg: "unknown trap".to_string(),
},
EXCEPTION_INT_DIVIDE_BY_ZERO => RuntimeError::IllegalArithmeticOperation,
EXCEPTION_INT_OVERFLOW => RuntimeError::IllegalArithmeticOperation,
_ => RuntimeError::Unknown {
msg: "unknown trap".to_string(),
},
}
.into())
} else {
let signal = match signum as DWORD {
EXCEPTION_FLT_DENORMAL_OPERAND
| EXCEPTION_FLT_DIVIDE_BY_ZERO
| EXCEPTION_FLT_INEXACT_RESULT
| EXCEPTION_FLT_INVALID_OPERATION
| EXCEPTION_FLT_OVERFLOW
| EXCEPTION_FLT_STACK_CHECK
| EXCEPTION_FLT_UNDERFLOW => "floating-point exception",
EXCEPTION_ILLEGAL_INSTRUCTION => "illegal instruction",
EXCEPTION_ACCESS_VIOLATION => "segmentation violation",
_ => "unkown trapped signal",
};
Err(RuntimeError::Unknown {
msg: format!("trap at {} - {}", exception_address, signal),
}
.into())
}
}
pub unsafe fn trigger_trap() -> ! {
unimplemented!("TODO");
// TODO
unimplemented!();
}

View File

@ -7,6 +7,7 @@ use cranelift_codegen::{
isa, Context,
};
use hashbrown::HashMap;
use std::ffi::c_void;
use std::{iter, mem};
use wasmer_runtime_core::{
backend::sys::{Memory, Protect},
@ -23,6 +24,9 @@ impl RelocSink for NullRelocSink {
fn reloc_jt(&mut self, _: u32, _: Reloc, _: ir::JumpTable) {}
}
pub type Trampoline =
unsafe extern "C" fn(*mut vm::Ctx, *const vm::Func, *const u64, *mut u64) -> c_void;
pub struct Trampolines {
memory: Memory,
offsets: HashMap<SigIndex, usize>,
@ -138,10 +142,7 @@ impl Trampolines {
}
}
pub fn lookup(
&self,
sig_index: SigIndex,
) -> Option<unsafe extern "C" fn(*mut vm::Ctx, *const vm::Func, *const u64, *mut u64)> {
pub fn lookup(&self, sig_index: SigIndex) -> Option<Trampoline> {
let offset = *self.offsets.get(&sig_index)?;
let ptr = unsafe { self.memory.as_ptr().add(offset) };
@ -212,7 +213,9 @@ fn wasm_ty_to_clif(ty: Type) -> ir::types::Type {
}
fn generate_trampoline_signature() -> ir::Signature {
let mut sig = ir::Signature::new(isa::CallConv::SystemV);
let isa = super::get_isa();
let call_convention = isa.default_call_conv();
let mut sig = ir::Signature::new(call_convention);
let ptr_param = ir::AbiParam {
value_type: ir::types::I64,
@ -227,7 +230,9 @@ fn generate_trampoline_signature() -> ir::Signature {
}
fn generate_export_signature(func_sig: &FuncSig) -> ir::Signature {
let mut export_clif_sig = ir::Signature::new(isa::CallConv::SystemV);
let isa = super::get_isa();
let call_convention = isa.default_call_conv();
let mut export_clif_sig = ir::Signature::new(call_convention);
let func_sig_iter = func_sig.params().iter().map(|wasm_ty| ir::AbiParam {
value_type: wasm_ty_to_clif(*wasm_ty),

View File

@ -150,7 +150,8 @@ impl Drop for Memory {
fn drop(&mut self) {
if !self.ptr.is_null() {
let success = unsafe { VirtualFree(self.ptr as _, self.size, MEM_DECOMMIT) };
assert_eq!(success, 0, "failed to unmap memory: {}", errno::errno());
// If the function succeeds, the return value is nonzero.
assert_eq!(success, 1, "failed to unmap memory: {}", errno::errno());
}
}
}

View File

@ -169,6 +169,7 @@ enum InnerFunc {}
/// Used to provide type safety (ish) for passing around function pointers.
/// The typesystem ensures this cannot be dereferenced since an
/// empty enum cannot actually exist.
#[repr(C)]
pub struct Func(InnerFunc);
/// An imported function, which contains the vmctx that owns this function.

View File

@ -1,8 +1,6 @@
use std::fs::remove_file;
use wabt::wat2wasm;
use wasmer_clif_backend::CraneliftCompiler;
use wasmer_runtime_core::{
cache::Cache,
error,
global::Global,
memory::Memory,
@ -15,7 +13,6 @@ use wasmer_runtime_core::{
static EXAMPLE_WASM: &'static [u8] = include_bytes!("simple.wasm");
fn main() -> error::Result<()> {
let compiler = CraneliftCompiler::new();
let wasm_binary = wat2wasm(IMPORT_MODULE.as_bytes()).expect("WAST not valid or malformed");
let inner_module = wasmer_runtime_core::compile_with(&wasm_binary, &CraneliftCompiler::new())?;

View File

@ -0,0 +1,18 @@
[package]
name = "wasmer-win-exception-handler"
version = "0.0.1"
description = "Wasmer runtime exception handling for Windows"
license = "MIT"
authors = ["The Wasmer Engineering Team <engineering@wasmer.io>"]
repository = "https://github.com/wasmerio/wasmer"
edition = "2018"
[target.'cfg(windows)'.dependencies]
wasmer-runtime-core = { path = "../runtime-core", version = "0.1.2" }
winapi = { version = "0.3", features = ["winbase", "errhandlingapi", "minwindef", "minwinbase", "winnt"] }
libc = "0.2.48"
[build-dependencies]
cmake = "0.1.35"
bindgen = "0.46.0"
regex = "1.0.6"

View File

@ -0,0 +1,11 @@
use cmake::Config;
fn main() {
#[cfg(target_os = "windows")]
{
let project_name = "exception_handling";
let dst = Config::new(project_name).build();
println!("cargo:rustc-link-search=native={}", dst.display());
println!("cargo:rustc-link-lib=static={}", project_name);
}
}

View File

@ -0,0 +1 @@
cmake-build-*

View File

@ -0,0 +1,6 @@
cmake_minimum_required(VERSION 3.0)
project(exception_handling C)
add_library(exception_handling STATIC exception_handling.c)
install(TARGETS exception_handling DESTINATION .)

View File

@ -0,0 +1,74 @@
#include <windows.h>
#include <setjmp.h>
#include "exception_handling.h"
#define CALL_FIRST 1
__declspec(thread) jmp_buf jmpBuf;
__declspec(thread) PVOID caughtExceptionAddress;
__declspec(thread) DWORD64 caughtInstructionPointer;
__declspec(thread) PVOID savedStackPointer;
__declspec(thread) BOOL exceptionHandlerInstalled = FALSE;
__declspec(thread) BOOL alreadyHandlingException = FALSE;
void longjmpOutOfHere() {
longjmp(jmpBuf, 1);
}
/// Get the current address that we use to jmp, the no inline is important
static __declspec(noinline) void *get_callee_frame_address(void) {
return _AddressOfReturnAddress();
}
static LONG WINAPI
exceptionHandler(struct _EXCEPTION_POINTERS *ExceptionInfo) {
EXCEPTION_RECORD* pExceptionRecord = ExceptionInfo->ExceptionRecord;
PCONTEXT pCONTEXT = ExceptionInfo->ContextRecord;
caughtExceptionAddress = pExceptionRecord->ExceptionAddress;
caughtInstructionPointer = pCONTEXT->Rip;
if (alreadyHandlingException == TRUE) {
return EXCEPTION_CONTINUE_SEARCH;
}
alreadyHandlingException = TRUE;
// Basically, here, we coerce the os to resume us into a context that calls `longjmp` instead of just continuing.
// Presumably, we cannot `longjmp` out of the signal/exception context, like we can on unix.
pCONTEXT->Rip = (uintptr_t)(&longjmpOutOfHere);
pCONTEXT->Rsp = (uintptr_t)(savedStackPointer);
return EXCEPTION_CONTINUE_EXECUTION;
}
uint8_t callProtected(trampoline_t trampoline,
const struct wasmer_instance_context_t* ctx,
const struct func_t* func,
const uint64_t* param_vec,
uint64_t* return_vec,
struct call_protected_result_t* out_result) {
// install exception handler
if (exceptionHandlerInstalled == FALSE) {
exceptionHandlerInstalled = TRUE;
AddVectoredExceptionHandler(CALL_FIRST, exceptionHandler);
}
// jmp jmp jmp!
int signum = setjmp(jmpBuf);
if (signum == 0) {
// save the stack pointer
savedStackPointer = get_callee_frame_address();
trampoline(ctx, func, param_vec, return_vec);
out_result->code = 0;
out_result->exceptionAddress = 0;
out_result->instructionPointer = 0;
return TRUE;
}
out_result->code = (uint64_t)signum;
out_result->exceptionAddress = (uint64_t)caughtExceptionAddress;
out_result->instructionPointer = caughtInstructionPointer;
caughtExceptionAddress = 0;
caughtInstructionPointer = 0;
return FALSE;
}

View File

@ -0,0 +1,25 @@
#ifndef WASMER_EXCEPTION_HANDLING_H
#define WASMER_EXCEPTION_HANDLING_H
#include <stdint.h>
struct func_t;
struct wasmer_instance_context_t;
typedef void(*trampoline_t)(struct wasmer_instance_context_t*, const struct func_t*, const uint64_t*, uint64_t*);
struct call_protected_result_t {
uint64_t code;
uint64_t exceptionAddress;
uint64_t instructionPointer;
};
uint8_t callProtected(
trampoline_t trampoline,
const struct wasmer_instance_context_t* ctx,
const struct func_t* func,
const uint64_t* param_vec,
uint64_t* return_vec,
struct call_protected_result_t* out_result);
#endif //WASMER_EXCEPTION_HANDLING_H

View File

@ -0,0 +1,55 @@
use std::ffi::c_void;
use wasmer_runtime_core::vm::{Ctx, Func};
type Trampoline = unsafe extern "C" fn(*mut Ctx, *const Func, *const u64, *mut u64) -> c_void;
type CallProtectedResult = Result<(), CallProtectedData>;
#[repr(C)]
pub struct CallProtectedData {
pub code: u64,
pub exceptionAddress: u64,
pub instructionPointer: u64,
}
extern "C" {
#[link_name = "callProtected"]
pub fn __call_protected(
trampoline: Trampoline,
ctx: *mut Ctx,
func: *const Func,
param_vec: *const u64,
return_vec: *mut u64,
out_result: *mut CallProtectedData,
) -> u8;
}
pub fn _call_protected(
trampoline: Trampoline,
ctx: *mut Ctx,
func: *const Func,
param_vec: *const u64,
return_vec: *mut u64,
) -> CallProtectedResult {
let mut out_result = CallProtectedData {
code: 0,
exceptionAddress: 0,
instructionPointer: 0,
};
let result = unsafe {
__call_protected(
trampoline,
ctx,
func,
param_vec,
return_vec,
&mut out_result,
)
};
println!("result from __call_protected: {}", result);
if result == 1 {
Ok(())
} else {
println!("returning error from _call_protected");
Err(out_result)
}
}

View File

@ -0,0 +1,5 @@
#[cfg(windows)]
mod exception_handling;
#[cfg(windows)]
pub use self::exception_handling::*;

View File

@ -69,7 +69,7 @@ fn execute_wasm(options: &Run) -> Result<(), String> {
let module = webassembly::compile(&wasm_binary[..])
.map_err(|e| format!("Can't compile module: {:?}", e))?;
let (_abi, import_object, em_globals) = if wasmer_emscripten::is_emscripten_module(&module) {
let (_abi, import_object, _em_globals) = if wasmer_emscripten::is_emscripten_module(&module) {
let mut emscripten_globals = wasmer_emscripten::EmscriptenGlobals::new(&module);
(
InstanceABI::Emscripten,