mirror of
https://github.com/Atmosphere-NX/Atmosphere.git
synced 2024-12-22 02:12:06 +00:00
142 lines
4.6 KiB
C++
142 lines
4.6 KiB
C++
/*
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* Copyright (c) Atmosphère-NX
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms and conditions of the GNU General Public License,
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* version 2, as published by the Free Software Foundation.
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*
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* This program is distributed in the hope it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <stratosphere.hpp>
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#include "os_tls_manager.hpp"
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#include "os_thread_manager.hpp"
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namespace ams::os::impl {
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/* TODO: Should we migrate away from libnx to this on NX at some point? */
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#if !defined(ATMOSPHERE_OS_HORIZON)
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namespace {
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constexpr auto TryCallDestructorCount = 4;
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void DefaultTlsDestructor(uintptr_t) {
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/* ... */
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}
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}
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void TlsManager::InvokeTlsDestructors() {
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/* Get the curent thread. */
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auto * const thread = impl::GetCurrentThread();
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/* Call all destructors. */
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for (int slot = 0; slot < static_cast<int>(TotalTlsSlotCountMax); ++slot) {
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if (const auto destructor = m_destructors[slot]; destructor != nullptr) {
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destructor(thread->tls_value_array[slot]);
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}
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thread->tls_value_array[slot] = 0;
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}
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/* Verify all tls values are wiped, trying up to four times. */
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for (auto i = 0; i < TryCallDestructorCount; ++i) {
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bool all_cleared = true;
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for (auto slot = 0; slot < static_cast<int>(TotalTlsSlotCountMax); ++slot) {
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if (thread->tls_value_array[slot] != 0) {
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all_cleared = false;
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if (const auto destructor = m_destructors[slot]; destructor != nullptr) {
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destructor(thread->tls_value_array[slot]);
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}
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thread->tls_value_array[slot] = 0;
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}
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}
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if (all_cleared) {
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break;
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}
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}
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}
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bool TlsManager::AllocateTlsSlot(TlsSlot *out, TlsDestructor destructor, bool sdk) {
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/* Decide on a slot. */
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int slot;
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{
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/* Lock appropriately. */
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std::scoped_lock lk(util::GetReference(impl::GetCurrentThread()->cs_thread));
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std::scoped_lock lk2(m_cs);
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/* If we're out of tls slots, fail. */
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if (!sdk && m_used >= static_cast<int>(TlsSlotCountMax)) {
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return false;
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}
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/* Get a slot. */
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slot = SearchUnusedTlsSlotUnsafe(sdk);
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/* Set the destructor. */
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m_destructors[slot] = (destructor != nullptr) ? destructor : DefaultTlsDestructor;
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/* Increment our used count, if the slot was a user slot. */
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if (!sdk) {
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++m_used;
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}
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}
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/* Zero the slot in all threads. */
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GetThreadManager().SetZeroToAllThreadsTlsSafe(slot);
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/* Set the output slot's value. */
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out->_value = slot;
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return true;
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}
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void TlsManager::FreeTlsSlot(TlsSlot slot) {
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/* Get the slot's index. */
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const auto slot_idx = slot._value;
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/* Lock appropriately. */
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std::scoped_lock lk(util::GetReference(impl::GetCurrentThread()->cs_thread));
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std::scoped_lock lk2(m_cs);
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/* Verify the slot is allocated. */
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AMS_ABORT_UNLESS(m_destructors[slot_idx] != nullptr);
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/* Free the slot. */
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m_destructors[slot_idx] = nullptr;
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/* Decrement our used count, if the slot was a user slot. */
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if (slot_idx < TlsSlotCountMax) {
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--m_used;
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}
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}
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int TlsManager::SearchUnusedTlsSlotUnsafe(bool sdk) {
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if (sdk) {
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/* Search backwards for an unused slot. */
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for (int slot = static_cast<int>(TotalTlsSlotCountMax) - 1; slot >= static_cast<int>(TlsSlotCountMax + SdkInternalTlsCount); --slot) {
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if (m_destructors[slot] == nullptr) {
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return slot;
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}
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}
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AMS_ABORT("Failed to allocate SdkTlsSlot");
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} else {
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/* Search forwards for an unused slot. */
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for (int slot = 0; slot < static_cast<int>(TlsSlotCountMax); ++slot) {
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if (m_destructors[slot] == nullptr) {
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return slot;
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}
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}
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AMS_ABORT("Failed to allocate TlsSlot");
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}
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}
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#endif
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}
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