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Move more logic into runtime-core and add an interactive shell.

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This commit is contained in:
losfair
2019-06-27 00:41:07 +08:00
parent a792ac6a48
commit 63f9818cf6
9 changed files with 525 additions and 406 deletions
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283
lib/runtime-core/src/alternative_stack.rs
View File

@ -1,17 +1,69 @@
mod raw {
use std::ffi::c_void;
extern "C" {
pub fn run_on_alternative_stack(
stack_end: *mut u64,
stack_begin: *mut u64,
userdata_arg2: *mut u8,
) -> u64;
pub fn setjmp(env: *mut c_void) -> i32;
pub fn longjmp(env: *mut c_void, val: i32) -> !;
}
}
use crate::state::x64::{read_stack, X64Register, GPR};
use crate::suspend;
use crate::vm;
use libc::siginfo_t;
use nix::sys::signal::{
sigaction, SaFlags, SigAction, SigHandler, SigSet, SIGBUS, SIGFPE, SIGILL, SIGINT, SIGSEGV,
SIGTRAP,
};
use std::any::Any;
use std::cell::UnsafeCell;
use std::ffi::c_void;
use std::process;
use std::sync::Once;
pub(crate) unsafe fn run_on_alternative_stack(stack_end: *mut u64, stack_begin: *mut u64) -> u64 {
raw::run_on_alternative_stack(stack_end, stack_begin, ::std::ptr::null_mut())
}
const SETJMP_BUFFER_LEN: usize = 27;
type SetJmpBuffer = [i32; SETJMP_BUFFER_LEN];
thread_local! {
static UNWIND: UnsafeCell<Option<(SetJmpBuffer, Option<Box<Any>>)>> = UnsafeCell::new(None);
}
pub unsafe fn catch_unsafe_unwind<R, F: FnOnce() -> R>(f: F) -> Result<R, Box<Any>> {
let unwind = UNWIND.with(|x| x.get());
let old = (*unwind).take();
*unwind = Some(([0; SETJMP_BUFFER_LEN], None));
if raw::setjmp(&mut (*unwind).as_mut().unwrap().0 as *mut SetJmpBuffer as *mut _) != 0 {
// error
let ret = (*unwind).as_mut().unwrap().1.take().unwrap();
*unwind = old;
Err(ret)
} else {
let ret = f();
// implicit control flow to the error case...
*unwind = old;
Ok(ret)
}
}
pub unsafe fn begin_unsafe_unwind(e: Box<Any>) -> ! {
let unwind = UNWIND.with(|x| x.get());
let inner = (*unwind)
.as_mut()
.expect("not within a catch_unsafe_unwind scope");
inner.1 = Some(e);
raw::longjmp(&mut inner.0 as *mut SetJmpBuffer as *mut _, 0xffff);
}
pub fn allocate_and_run<R, F: FnOnce() -> R>(size: usize, f: F) -> R {
struct Context<F: FnOnce() -> R, R> {
f: Option<F>,
@ -32,9 +84,11 @@ pub fn allocate_and_run<R, F: FnOnce() -> R>(size: usize, f: F) -> R {
assert!(size >= 4096);
let mut stack: Vec<u64> = vec![0; size / 8];
let mut end_offset = stack.len();
let end_offset = stack.len();
stack[end_offset - 4] = invoke::<F, R> as usize as u64;
// NOTE: Keep this consistent with `image-loading-*.s`.
let stack_begin = stack.as_mut_ptr().offset((end_offset - 4 - 6) as isize);
let stack_end = stack.as_mut_ptr().offset(end_offset as isize);
@ -46,3 +100,230 @@ pub fn allocate_and_run<R, F: FnOnce() -> R>(size: usize, f: F) -> R {
ctx.ret.take().unwrap()
}
}
extern "C" fn signal_trap_handler(
_signum: ::nix::libc::c_int,
siginfo: *mut siginfo_t,
ucontext: *mut c_void,
) {
unsafe {
let fault = get_fault_info(siginfo as _, ucontext);
allocate_and_run(65536, || {
// TODO: make this safer
let ctx = &*(fault.known_registers[X64Register::GPR(GPR::R15).to_index().0].unwrap()
as *mut vm::Ctx);
let rsp = fault.known_registers[X64Register::GPR(GPR::RSP).to_index().0].unwrap();
let msm = (*ctx.module)
.runnable_module
.get_module_state_map()
.unwrap();
let code_base = (*ctx.module).runnable_module.get_code().unwrap().as_ptr() as usize;
let image = read_stack(
&msm,
code_base,
rsp as usize as *const u64,
fault.known_registers,
Some(fault.ip as usize as u64),
);
use colored::*;
eprintln!(
"\n{}",
"Wasmer encountered an error while running your WebAssembly program."
.bold()
.red()
);
image.print_backtrace_if_needed();
});
begin_unsafe_unwind(Box::new(()));
}
}
extern "C" fn sigint_handler(
_signum: ::nix::libc::c_int,
_siginfo: *mut siginfo_t,
_ucontext: *mut c_void,
) {
if suspend::get_interrupted() {
eprintln!(
"Got another SIGINT before interrupt is handled by WebAssembly program, aborting"
);
process::abort();
}
suspend::set_interrupted(true);
eprintln!("Notified WebAssembly program to exit");
}
pub fn ensure_sighandler() {
INSTALL_SIGHANDLER.call_once(|| unsafe {
install_sighandler();
});
}
static INSTALL_SIGHANDLER: Once = Once::new();
unsafe fn install_sighandler() {
let sa_trap = SigAction::new(
SigHandler::SigAction(signal_trap_handler),
SaFlags::SA_ONSTACK,
SigSet::empty(),
);
sigaction(SIGFPE, &sa_trap).unwrap();
sigaction(SIGILL, &sa_trap).unwrap();
sigaction(SIGSEGV, &sa_trap).unwrap();
sigaction(SIGBUS, &sa_trap).unwrap();
sigaction(SIGTRAP, &sa_trap).unwrap();
let sa_interrupt = SigAction::new(
SigHandler::SigAction(sigint_handler),
SaFlags::SA_ONSTACK,
SigSet::empty(),
);
sigaction(SIGINT, &sa_interrupt).unwrap();
}
pub struct FaultInfo {
pub faulting_addr: *const c_void,
pub ip: *const c_void,
pub known_registers: [Option<u64>; 24],
}
#[cfg(all(target_os = "linux", target_arch = "x86_64"))]
pub unsafe fn get_fault_info(siginfo: *const c_void, ucontext: *const c_void) -> FaultInfo {
use libc::{
ucontext_t, REG_R10, REG_R11, REG_R12, REG_R13, REG_R14, REG_R15, REG_R8, REG_R9, REG_RAX,
REG_RBP, REG_RBX, REG_RCX, REG_RDI, REG_RDX, REG_RIP, REG_RSI, REG_RSP,
};
#[allow(dead_code)]
#[repr(C)]
struct siginfo_t {
si_signo: i32,
si_errno: i32,
si_code: i32,
si_addr: u64,
// ...
}
let siginfo = siginfo as *const siginfo_t;
let si_addr = (*siginfo).si_addr;
let ucontext = ucontext as *const ucontext_t;
let gregs = &(*ucontext).uc_mcontext.gregs;
let mut known_registers: [Option<u64>; 24] = [None; 24];
known_registers[X64Register::GPR(GPR::R15).to_index().0] = Some(gregs[REG_R15 as usize] as _);
known_registers[X64Register::GPR(GPR::R14).to_index().0] = Some(gregs[REG_R14 as usize] as _);
known_registers[X64Register::GPR(GPR::R13).to_index().0] = Some(gregs[REG_R13 as usize] as _);
known_registers[X64Register::GPR(GPR::R12).to_index().0] = Some(gregs[REG_R12 as usize] as _);
known_registers[X64Register::GPR(GPR::R11).to_index().0] = Some(gregs[REG_R11 as usize] as _);
known_registers[X64Register::GPR(GPR::R10).to_index().0] = Some(gregs[REG_R10 as usize] as _);
known_registers[X64Register::GPR(GPR::R9).to_index().0] = Some(gregs[REG_R9 as usize] as _);
known_registers[X64Register::GPR(GPR::R8).to_index().0] = Some(gregs[REG_R8 as usize] as _);
known_registers[X64Register::GPR(GPR::RSI).to_index().0] = Some(gregs[REG_RSI as usize] as _);
known_registers[X64Register::GPR(GPR::RDI).to_index().0] = Some(gregs[REG_RDI as usize] as _);
known_registers[X64Register::GPR(GPR::RDX).to_index().0] = Some(gregs[REG_RDX as usize] as _);
known_registers[X64Register::GPR(GPR::RCX).to_index().0] = Some(gregs[REG_RCX as usize] as _);
known_registers[X64Register::GPR(GPR::RBX).to_index().0] = Some(gregs[REG_RBX as usize] as _);
known_registers[X64Register::GPR(GPR::RAX).to_index().0] = Some(gregs[REG_RAX as usize] as _);
known_registers[X64Register::GPR(GPR::RBP).to_index().0] = Some(gregs[REG_RBP as usize] as _);
known_registers[X64Register::GPR(GPR::RSP).to_index().0] = Some(gregs[REG_RSP as usize] as _);
// TODO: XMM registers
FaultInfo {
faulting_addr: si_addr as usize as _,
ip: gregs[REG_RIP as usize] as _,
known_registers,
}
}
#[cfg(all(target_os = "macos", target_arch = "x86_64"))]
pub unsafe fn get_fault_info(siginfo: *const c_void, ucontext: *const c_void) -> FaultInfo {
#[allow(dead_code)]
#[repr(C)]
struct ucontext_t {
uc_onstack: u32,
uc_sigmask: u32,
uc_stack: libc::stack_t,
uc_link: *const ucontext_t,
uc_mcsize: u64,
uc_mcontext: *const mcontext_t,
}
#[repr(C)]
struct exception_state {
trapno: u16,
cpu: u16,
err: u32,
faultvaddr: u64,
}
#[repr(C)]
struct regs {
rax: u64,
rbx: u64,
rcx: u64,
rdx: u64,
rdi: u64,
rsi: u64,
rbp: u64,
rsp: u64,
r8: u64,
r9: u64,
r10: u64,
r11: u64,
r12: u64,
r13: u64,
r14: u64,
r15: u64,
rip: u64,
rflags: u64,
cs: u64,
fs: u64,
gs: u64,
}
#[allow(dead_code)]
#[repr(C)]
struct mcontext_t {
es: exception_state,
ss: regs,
// ...
}
let siginfo = siginfo as *const siginfo_t;
let si_addr = (*siginfo).si_addr;
let ucontext = ucontext as *const ucontext_t;
let ss = &(*(*ucontext).uc_mcontext).ss;
let mut known_registers: [Option<u64>; 24] = [None; 24];
known_registers[X64Register::GPR(GPR::R15).to_index().0] = Some(ss.r15);
known_registers[X64Register::GPR(GPR::R14).to_index().0] = Some(ss.r14);
known_registers[X64Register::GPR(GPR::R13).to_index().0] = Some(ss.r13);
known_registers[X64Register::GPR(GPR::R12).to_index().0] = Some(ss.r12);
known_registers[X64Register::GPR(GPR::R11).to_index().0] = Some(ss.r11);
known_registers[X64Register::GPR(GPR::R10).to_index().0] = Some(ss.r10);
known_registers[X64Register::GPR(GPR::R9).to_index().0] = Some(ss.r9);
known_registers[X64Register::GPR(GPR::R8).to_index().0] = Some(ss.r8);
known_registers[X64Register::GPR(GPR::RSI).to_index().0] = Some(ss.rsi);
known_registers[X64Register::GPR(GPR::RDI).to_index().0] = Some(ss.rdi);
known_registers[X64Register::GPR(GPR::RDX).to_index().0] = Some(ss.rdx);
known_registers[X64Register::GPR(GPR::RCX).to_index().0] = Some(ss.rcx);
known_registers[X64Register::GPR(GPR::RBX).to_index().0] = Some(ss.rbx);
known_registers[X64Register::GPR(GPR::RAX).to_index().0] = Some(ss.rax);
known_registers[X64Register::GPR(GPR::RBP).to_index().0] = Some(ss.rbp);
known_registers[X64Register::GPR(GPR::RSP).to_index().0] = Some(ss.rsp);
// TODO: XMM registers
FaultInfo {
faulting_addr: si_addr,
ip: ss.rip as _,
known_registers,
}
}

38
lib/runtime-core/src/state.rs
View File

@ -226,14 +226,6 @@ impl MachineStateDiff {
}
impl ExecutionStateImage {
pub fn from_bytes(input: &[u8]) -> Option<ExecutionStateImage> {
use bincode::deserialize;
match deserialize(input) {
Ok(x) => Some(x),
Err(_) => None,
}
}
pub fn print_backtrace_if_needed(&self) {
use std::env;
@ -319,6 +311,21 @@ impl ExecutionStateImage {
}
}
impl InstanceImage {
pub fn from_bytes(input: &[u8]) -> Option<InstanceImage> {
use bincode::deserialize;
match deserialize(input) {
Ok(x) => Some(x),
Err(_) => None,
}
}
pub fn to_bytes(&self) -> Vec<u8> {
use bincode::serialize;
serialize(self).unwrap()
}
}
#[cfg(all(unix, target_arch = "x86_64"))]
pub mod x64 {
use super::*;
@ -341,19 +348,20 @@ pub mod x64 {
pub unsafe fn invoke_call_return_on_stack_raw_image(
msm: &ModuleStateMap,
code_base: usize,
image: &[u8],
image_raw: Vec<u8>,
vmctx: &mut Ctx,
) -> u64 {
use bincode::deserialize;
let image: InstanceImage = deserialize(image).unwrap();
invoke_call_return_on_stack(msm, code_base, &image, vmctx)
let image: InstanceImage = deserialize(&image_raw).unwrap();
drop(image_raw); // free up memory
invoke_call_return_on_stack(msm, code_base, image, vmctx)
}
#[warn(unused_variables)]
pub unsafe fn invoke_call_return_on_stack(
msm: &ModuleStateMap,
code_base: usize,
image: &InstanceImage,
image: InstanceImage,
vmctx: &mut Ctx,
) -> u64 {
let mut stack: Vec<u64> = vec![0; 1048576 * 8 / 8]; // 8MB stack
@ -366,7 +374,7 @@ pub mod x64 {
let mut known_registers: [Option<u64>; 24] = [None; 24];
let local_functions_vec: Vec<&FunctionStateMap> =
msm.local_functions.iter().map(|(k, v)| v).collect();
msm.local_functions.iter().map(|(_, v)| v).collect();
// Bottom to top
for f in image.execution_state.frames.iter().rev() {
@ -513,6 +521,8 @@ pub mod x64 {
image.globals[i];
}
drop(image); // free up host memory
run_on_alternative_stack(
stack.as_mut_ptr().offset(stack.len() as isize),
stack.as_mut_ptr().offset(stack_offset as isize),
@ -649,7 +659,7 @@ pub mod x64 {
known_registers[idx.0] = Some(*stack);
stack = stack.offset(1);
}
MachineValue::CopyStackBPRelative(offset) => {
MachineValue::CopyStackBPRelative(_) => {
stack = stack.offset(1);
}
MachineValue::WasmStack(idx) => {

88
lib/runtime-core/src/suspend.rs
View File

@ -1,76 +1,77 @@
use crate::alternative_stack::begin_unsafe_unwind;
use crate::import::{ImportObject, Namespace};
use crate::trampoline::{CallContext, TrampolineBuffer, TrampolineBufferBuilder};
use crate::vm::Ctx;
use bincode::serialize;
use std::ffi::c_void;
use std::fs::File;
use std::io::Write;
use std::rc::Rc;
use std::sync::atomic::{AtomicBool, Ordering};
pub struct SuspendConfig {
pub image_path: String,
static INTERRUPTED: AtomicBool = AtomicBool::new(false);
pub fn set_interrupted(x: bool) {
INTERRUPTED.store(x, Ordering::SeqCst);
}
pub fn get_interrupted() -> bool {
INTERRUPTED.load(Ordering::SeqCst)
}
pub fn get_and_reset_interrupted() -> bool {
INTERRUPTED.swap(false, Ordering::SeqCst)
}
struct ImportContext {
next: Option<(*mut c_void, fn(*mut c_void))>,
trampolines: Rc<TrampolineBuffer>,
config: Rc<SuspendConfig>,
_trampolines: Rc<TrampolineBuffer>,
}
impl ImportContext {
fn new(trampolines: Rc<TrampolineBuffer>, config: Rc<SuspendConfig>) -> ImportContext {
fn new(trampolines: Rc<TrampolineBuffer>) -> ImportContext {
ImportContext {
trampolines,
next: None,
config,
_trampolines: trampolines,
}
}
}
fn destroy_import_context(x: *mut c_void) {
unsafe {
let ctx = Box::from_raw(x as *mut ImportContext);
if let Some(x) = ctx.next {
(x.1)(x.0);
}
}
}
pub fn patch_import_object(x: &mut ImportObject, config: SuspendConfig) {
let config = Rc::new(config);
pub fn patch_import_object(x: &mut ImportObject) {
let mut builder = TrampolineBufferBuilder::new();
let config_ptr: &SuspendConfig = &*config;
let idx = builder.add_context_rsp_state_preserving_trampoline(
suspend,
config_ptr as *const SuspendConfig as *const CallContext,
);
let idx_suspend =
builder.add_context_rsp_state_preserving_trampoline(suspend, ::std::ptr::null());
let idx_check_interrupt =
builder.add_context_rsp_state_preserving_trampoline(check_interrupt, ::std::ptr::null());
let trampolines = builder.build();
let suspend_indirect: fn(&mut Ctx) =
unsafe { ::std::mem::transmute(trampolines.get_trampoline(idx)) };
unsafe { ::std::mem::transmute(trampolines.get_trampoline(idx_suspend)) };
let check_interrupt_indirect: fn(&mut Ctx) =
unsafe { ::std::mem::transmute(trampolines.get_trampoline(idx_check_interrupt)) };
let trampolines = Rc::new(trampolines);
// FIXME: Memory leak!
::std::mem::forget(ImportContext::new(trampolines.clone(), config.clone()));
::std::mem::forget(ImportContext::new(trampolines.clone()));
let mut ns = Namespace::new();
ns.insert("suspend", func!(suspend_indirect));
ns.insert("check_interrupt", func!(check_interrupt_indirect));
x.register("wasmer_suspend", ns);
}
#[allow(clippy::cast_ptr_alignment)]
unsafe extern "C" fn suspend(
ctx: &mut Ctx,
config_ptr_raw: *const CallContext,
mut stack: *const u64,
) {
unsafe extern "C" fn check_interrupt(ctx: &mut Ctx, _: *const CallContext, stack: *const u64) {
if get_and_reset_interrupted() {
do_suspend(ctx, stack);
}
}
#[allow(clippy::cast_ptr_alignment)]
unsafe extern "C" fn suspend(ctx: &mut Ctx, _: *const CallContext, stack: *const u64) {
do_suspend(ctx, stack);
}
unsafe fn do_suspend(ctx: &mut Ctx, mut stack: *const u64) -> ! {
use crate::state::x64::{build_instance_image, read_stack, X64Register, GPR};
{
let config = &*(config_ptr_raw as *const SuspendConfig);
let image = {
let msm = (*ctx.module)
.runnable_module
.get_module_state_map()
@ -99,11 +100,8 @@ unsafe extern "C" fn suspend(
eprintln!("\n{}", "Suspending instance.".green().bold());
}
es_image.print_backtrace_if_needed();
let image = build_instance_image(ctx, es_image);
let image_bin = serialize(&image).unwrap();
let mut f = File::create(&config.image_path).unwrap();
f.write_all(&image_bin).unwrap();
}
build_instance_image(ctx, es_image)
};
::std::process::exit(0);
begin_unsafe_unwind(Box::new(image));
}

4
lib/runtime-core/src/typed_func.rs
View File

@ -180,6 +180,10 @@ where
_phantom: PhantomData,
}
}
pub fn get_vm_func(&self) -> NonNull<vm::Func> {
self.f
}
}
impl<'a, Args, Rets> Func<'a, Args, Rets, Host>