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107 lines
3.2 KiB
107 lines
3.2 KiB
// SPDX-FileCopyrightText: Copyright 2025 Eden Emulator Project
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// SPDX-License-Identifier: GPL-3.0-or-later
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// SPDX-FileCopyrightText: Copyright 2020 yuzu Emulator Project
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// SPDX-License-Identifier: GPL-2.0-or-later
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#ifdef _WIN32
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#include <windows.h>
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#else
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#include <sys/mman.h>
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#endif
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#ifdef __OPENORBIS__
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#include <ranges>
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#include <csignal>
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#include <boost/container/static_vector.hpp>
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#endif
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#include "common/assert.h"
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#include "common/virtual_buffer.h"
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#include "common/logging/log.h"
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// PlayStation 4
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// Flag needs to be undef-ed on non PS4 since it has different semantics
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// on some platforms.
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#ifdef __OPENORBIS__
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# ifndef MAP_SYSTEM
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# define MAP_SYSTEM 0x2000
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# endif
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# ifndef MAP_VOID
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# define MAP_VOID 0x100
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# endif
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// sigaction(2) has a motherfucking bug on musl where the thing isnt even properly prefixed
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# undef sa_sigaction
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# define sa_sigaction __sa_handler.__sa_sigaction
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#endif
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namespace Common {
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#ifdef __OPENORBIS__
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static struct sigaction old_sa_segv;
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static boost::container::static_vector<std::pair<void*, size_t>, 16> swap_regions;
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static void SwapHandler(int sig, siginfo_t* si, void* raw_context) {
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if (std::ranges::find_if(swap_regions, [addr = si->si_addr](auto const& e) {
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return uintptr_t(addr) >= uintptr_t(e.first) && uintptr_t(addr) < uintptr_t(e.first) + e.second;
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}) != swap_regions.end()) {
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size_t const page_size = 4096;
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size_t const page_mask = ~0xfff;
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// should replace the existing mapping... ugh
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void* aligned_addr = reinterpret_cast<void*>(uintptr_t(si->si_addr) & page_mask);
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void* res = mmap(aligned_addr, page_size, PROT_READ | PROT_WRITE, MAP_FIXED | MAP_ANON | MAP_PRIVATE, -1, 0);
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ASSERT(res != MAP_FAILED);
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} else {
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struct sigaction* retry_sa = &old_sa_segv;
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if ((retry_sa->sa_flags & SA_SIGINFO) != 0) {
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retry_sa->sa_sigaction(sig, si, raw_context);
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} else if (retry_sa->sa_handler == SIG_DFL) {
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signal(sig, SIG_DFL);
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} else if (retry_sa->sa_handler == SIG_IGN) {
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// ignore?
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} else {
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retry_sa->sa_handler(sig);
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}
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}
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}
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bool InitSwap() noexcept {
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struct sigaction sa;
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sa.sa_handler = NULL;
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sa.sa_sigaction = &SwapHandler;
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sigemptyset(&sa.sa_mask);
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sa.sa_flags = SA_SIGINFO | SA_RESTART;
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return sigaction(SIGSEGV, &sa, &old_sa_segv) == 0;
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}
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#else
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bool InitSwap() noexcept {
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return true;
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}
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#endif
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void* AllocateMemoryPages(std::size_t size) noexcept {
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#ifdef _WIN32
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void* addr = VirtualAlloc(nullptr, size, MEM_COMMIT, PAGE_READWRITE);
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ASSERT(addr != nullptr);
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#elif defined(__OPENORBIS__)
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void* addr = mmap(nullptr, size, PROT_NONE, MAP_VOID | MAP_PRIVATE, -1, 0);
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ASSERT(addr != MAP_FAILED);
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swap_regions.emplace_back(addr, size);
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#else
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void* addr = mmap(nullptr, size, PROT_READ | PROT_WRITE, MAP_ANON | MAP_PRIVATE, -1, 0);
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ASSERT(addr != MAP_FAILED);
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#endif
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return addr;
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}
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void FreeMemoryPages(void* addr, [[maybe_unused]] std::size_t size) noexcept {
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if (!addr)
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return;
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#ifdef _WIN32
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VirtualFree(addr, 0, MEM_RELEASE);
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#else
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int rc = munmap(addr, size);
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ASSERT(rc == 0);
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#endif
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}
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} // namespace Common
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