From 26a029d407be480d791972afb5975cf62c9360a6 Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Fri, 19 Apr 2024 02:47:55 +0200 Subject: Adding upstream version 124.0.1. Signed-off-by: Daniel Baumann --- js/src/wasm/WasmSignalHandlers.h | 63 ++++++++++++++++++++++++++++++++++++++++ 1 file changed, 63 insertions(+) create mode 100644 js/src/wasm/WasmSignalHandlers.h (limited to 'js/src/wasm/WasmSignalHandlers.h') diff --git a/js/src/wasm/WasmSignalHandlers.h b/js/src/wasm/WasmSignalHandlers.h new file mode 100644 index 0000000000..4b452d6b37 --- /dev/null +++ b/js/src/wasm/WasmSignalHandlers.h @@ -0,0 +1,63 @@ +/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- + * vim: set ts=8 sts=2 et sw=2 tw=80: + * + * Copyright 2014 Mozilla Foundation + * + * Licensed under the Apache License, Version 2.0 (the "License"); + * you may not use this file except in compliance with the License. + * You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + */ + +#ifndef wasm_signal_handlers_h +#define wasm_signal_handlers_h + +#include "js/ProfilingFrameIterator.h" +#include "wasm/WasmProcess.h" + +namespace js { +namespace wasm { + +using RegisterState = JS::ProfilingFrameIterator::RegisterState; + +// This function performs the low-overhead signal handler initialization that we +// want to do eagerly to ensure a more-deterministic global process state. This +// is especially relevant for signal handlers since handler ordering depends on +// installation order: the wasm signal handler must run *before* the other crash +// handlers (breakpad) and since POSIX signal handlers work LIFO, this function +// needs to be called at the end of the startup process, after the other two +// handlers have been installed. Currently, this is achieved by having +// JSRuntime() call this function. There can be multiple JSRuntimes per process +// so this function can thus be called multiple times, having no effect after +// the first call. +void EnsureEagerProcessSignalHandlers(); + +// Assuming EnsureEagerProcessSignalHandlers() has already been called, +// this function performs the full installation of signal handlers which must +// be performed per-thread/JSContext. This operation may incur some overhead and +// so should be done only when needed to use wasm. Currently, this is done in +// wasm::HasPlatformSupport() which is called when deciding whether to expose +// the 'WebAssembly' object on the global object. +bool EnsureFullSignalHandlers(JSContext* cx); + +// Return whether, with the given simulator register state, a memory access to +// 'addr' of size 'numBytes' needs to trap and, if so, where the simulator +// should redirect pc to. +bool MemoryAccessTraps(const RegisterState& regs, uint8_t* addr, + uint32_t numBytes, uint8_t** newPC); + +// Return whether, with the given simulator register state, an illegal +// instruction fault is expected and, if so, the value of the next PC. +bool HandleIllegalInstruction(const RegisterState& regs, uint8_t** newPC); + +} // namespace wasm +} // namespace js + +#endif // wasm_signal_handlers_h -- cgit v1.2.3