diff --git a/src/core/hle/kernel/process.cpp b/src/core/hle/kernel/process.cpp
index 7cfc513a1c..f45ef05f69 100644
--- a/src/core/hle/kernel/process.cpp
+++ b/src/core/hle/kernel/process.cpp
@@ -3,6 +3,7 @@
// Refer to the license.txt file included.
#include <algorithm>
+#include <bitset>
#include <memory>
#include <random>
#include "common/alignment.h"
@@ -48,8 +49,58 @@ void SetupMainThread(Process& owner_process, KernelCore& kernel, u32 priority) {
}
} // Anonymous namespace
-SharedPtr<Process> Process::Create(Core::System& system, std::string name,
- Process::ProcessType type) {
+// Represents a page used for thread-local storage.
+//
+// Each TLS page contains slots that may be used by processes and threads.
+// Every process and thread is created with a slot in some arbitrary page
+// (whichever page happens to have an available slot).
+class TLSPage {
+public:
+ static constexpr std::size_t num_slot_entries = Memory::PAGE_SIZE / Memory::TLS_ENTRY_SIZE;
+
+ explicit TLSPage(VAddr address) : base_address{address} {}
+
+ bool HasAvailableSlots() const {
+ return !is_slot_used.all();
+ }
+
+ VAddr GetBaseAddress() const {
+ return base_address;
+ }
+
+ std::optional<VAddr> ReserveSlot() {
+ for (std::size_t i = 0; i < is_slot_used.size(); i++) {
+ if (is_slot_used[i]) {
+ continue;
+ }
+
+ is_slot_used[i] = true;
+ return base_address + (i * Memory::TLS_ENTRY_SIZE);
+ }
+
+ return std::nullopt;
+ }
+
+ void ReleaseSlot(VAddr address) {
+ // Ensure that all given addresses are consistent with how TLS pages
+ // are intended to be used when releasing slots.
+ ASSERT(IsWithinPage(address));
+ ASSERT((address % Memory::TLS_ENTRY_SIZE) == 0);
+
+ const std::size_t index = (address - base_address) / Memory::TLS_ENTRY_SIZE;
+ is_slot_used[index] = false;
+ }
+
+private:
+ bool IsWithinPage(VAddr address) const {
+ return base_address <= address && address < base_address + Memory::PAGE_SIZE;
+ }
+
+ VAddr base_address;
+ std::bitset<num_slot_entries> is_slot_used;
+};
+
+SharedPtr<Process> Process::Create(Core::System& system, std::string name, ProcessType type) {
auto& kernel = system.Kernel();
SharedPtr<Process> process(new Process(system));
@@ -181,61 +232,55 @@ void Process::PrepareForTermination() {
}
/**
- * Finds a free location for the TLS section of a thread.
- * @param tls_slots The TLS page array of the thread's owner process.
- * Returns a tuple of (page, slot, alloc_needed) where:
- * page: The index of the first allocated TLS page that has free slots.
- * slot: The index of the first free slot in the indicated page.
- * alloc_needed: Whether there's a need to allocate a new TLS page (All pages are full).
+ * Attempts to find a TLS page that contains a free slot for
+ * use by a thread.
+ *
+ * @returns If a page with an available slot is found, then an iterator
+ * pointing to the page is returned. Otherwise the end iterator
+ * is returned instead.
*/
-static std::tuple<std::size_t, std::size_t, bool> FindFreeThreadLocalSlot(
- const std::vector<std::bitset<8>>& tls_slots) {
- // Iterate over all the allocated pages, and try to find one where not all slots are used.
- for (std::size_t page = 0; page < tls_slots.size(); ++page) {
- const auto& page_tls_slots = tls_slots[page];
- if (!page_tls_slots.all()) {
- // We found a page with at least one free slot, find which slot it is
- for (std::size_t slot = 0; slot < page_tls_slots.size(); ++slot) {
- if (!page_tls_slots.test(slot)) {
- return std::make_tuple(page, slot, false);
- }
- }
- }
- }
-
- return std::make_tuple(0, 0, true);
+static auto FindTLSPageWithAvailableSlots(std::vector<TLSPage>& tls_pages) {
+ return std::find_if(tls_pages.begin(), tls_pages.end(),
+ [](const auto& page) { return page.HasAvailableSlots(); });
}
-VAddr Process::MarkNextAvailableTLSSlotAsUsed(Thread& thread) {
- auto [available_page, available_slot, needs_allocation] = FindFreeThreadLocalSlot(tls_slots);
- const VAddr tls_begin = vm_manager.GetTLSIORegionBaseAddress();
+VAddr Process::CreateTLSRegion() {
+ auto tls_page_iter = FindTLSPageWithAvailableSlots(tls_pages);
- if (needs_allocation) {
- tls_slots.emplace_back(0); // The page is completely available at the start
- available_page = tls_slots.size() - 1;
- available_slot = 0; // Use the first slot in the new page
+ if (tls_page_iter == tls_pages.cend()) {
+ const auto region_address =
+ vm_manager.FindFreeRegion(vm_manager.GetTLSIORegionBaseAddress(),
+ vm_manager.GetTLSIORegionEndAddress(), Memory::PAGE_SIZE);
+ ASSERT(region_address.Succeeded());
- // Allocate some memory from the end of the linear heap for this region.
- auto& tls_memory = thread.GetTLSMemory();
- tls_memory->insert(tls_memory->end(), Memory::PAGE_SIZE, 0);
+ const auto map_result = vm_manager.MapMemoryBlock(
+ *region_address, std::make_shared<std::vector<u8>>(Memory::PAGE_SIZE), 0,
+ Memory::PAGE_SIZE, MemoryState::ThreadLocal);
+ ASSERT(map_result.Succeeded());
- vm_manager.RefreshMemoryBlockMappings(tls_memory.get());
+ tls_pages.emplace_back(*region_address);
- vm_manager.MapMemoryBlock(tls_begin + available_page * Memory::PAGE_SIZE, tls_memory, 0,
- Memory::PAGE_SIZE, MemoryState::ThreadLocal);
+ const auto reserve_result = tls_pages.back().ReserveSlot();
+ ASSERT(reserve_result.has_value());
+
+ return *reserve_result;
}
- tls_slots[available_page].set(available_slot);
-
- return tls_begin + available_page * Memory::PAGE_SIZE + available_slot * Memory::TLS_ENTRY_SIZE;
+ return *tls_page_iter->ReserveSlot();
}
-void Process::FreeTLSSlot(VAddr tls_address) {
- const VAddr tls_base = tls_address - vm_manager.GetTLSIORegionBaseAddress();
- const VAddr tls_page = tls_base / Memory::PAGE_SIZE;
- const VAddr tls_slot = (tls_base % Memory::PAGE_SIZE) / Memory::TLS_ENTRY_SIZE;
+void Process::FreeTLSRegion(VAddr tls_address) {
+ const VAddr aligned_address = Common::AlignDown(tls_address, Memory::PAGE_SIZE);
+ auto iter =
+ std::find_if(tls_pages.begin(), tls_pages.end(), [aligned_address](const auto& page) {
+ return page.GetBaseAddress() == aligned_address;
+ });
- tls_slots[tls_page].reset(tls_slot);
+ // Something has gone very wrong if we're freeing a region
+ // with no actual page available.
+ ASSERT(iter != tls_pages.cend());
+
+ iter->ReleaseSlot(tls_address);
}
void Process::LoadModule(CodeSet module_, VAddr base_addr) {
diff --git a/src/core/hle/kernel/process.h b/src/core/hle/kernel/process.h
index 248fd38405..39b098e9bb 100644
--- a/src/core/hle/kernel/process.h
+++ b/src/core/hle/kernel/process.h
@@ -5,7 +5,6 @@
#pragma once
#include <array>
-#include <bitset>
#include <cstddef>
#include <list>
#include <string>
@@ -32,6 +31,7 @@ namespace Kernel {
class KernelCore;
class ResourceLimit;
class Thread;
+class TLSPage;
struct CodeSet;
@@ -260,10 +260,10 @@ public:
// Thread-local storage management
// Marks the next available region as used and returns the address of the slot.
- VAddr MarkNextAvailableTLSSlotAsUsed(Thread& thread);
+ [[nodiscard]] VAddr CreateTLSRegion();
// Frees a used TLS slot identified by the given address
- void FreeTLSSlot(VAddr tls_address);
+ void FreeTLSRegion(VAddr tls_address);
private:
explicit Process(Core::System& system);
@@ -310,7 +310,7 @@ private:
/// holds the TLS for a specific thread. This vector contains which parts are in use for each
/// page as a bitmask.
/// This vector will grow as more pages are allocated for new threads.
- std::vector<std::bitset<8>> tls_slots;
+ std::vector<TLSPage> tls_pages;
/// Contains the parsed process capability descriptors.
ProcessCapabilities capabilities;
diff --git a/src/core/hle/kernel/thread.cpp b/src/core/hle/kernel/thread.cpp
index a055a50026..ec529e7f2d 100644
--- a/src/core/hle/kernel/thread.cpp
+++ b/src/core/hle/kernel/thread.cpp
@@ -65,7 +65,7 @@ void Thread::Stop() {
owner_process->UnregisterThread(this);
// Mark the TLS slot in the thread's page as free.
- owner_process->FreeTLSSlot(tls_address);
+ owner_process->FreeTLSRegion(tls_address);
}
void Thread::WakeAfterDelay(s64 nanoseconds) {
@@ -205,9 +205,9 @@ ResultVal<SharedPtr<Thread>> Thread::Create(KernelCore& kernel, std::string name
thread->name = std::move(name);
thread->callback_handle = kernel.ThreadWakeupCallbackHandleTable().Create(thread).Unwrap();
thread->owner_process = &owner_process;
+ thread->tls_address = thread->owner_process->CreateTLSRegion();
thread->scheduler = &system.Scheduler(processor_id);
thread->scheduler->AddThread(thread);
- thread->tls_address = thread->owner_process->MarkNextAvailableTLSSlotAsUsed(*thread);
thread->owner_process->RegisterThread(thread.get());
diff --git a/src/core/hle/kernel/thread.h b/src/core/hle/kernel/thread.h
index b4b9cda7cd..07e989637e 100644
--- a/src/core/hle/kernel/thread.h
+++ b/src/core/hle/kernel/thread.h
@@ -5,7 +5,6 @@
#pragma once
#include <functional>
-#include <memory>
#include <string>
#include <vector>
@@ -78,9 +77,6 @@ enum class ThreadActivity : u32 {
class Thread final : public WaitObject {
public:
- using TLSMemory = std::vector<u8>;
- using TLSMemoryPtr = std::shared_ptr<TLSMemory>;
-
using MutexWaitingThreads = std::vector<SharedPtr<Thread>>;
using ThreadContext = Core::ARM_Interface::ThreadContext;
@@ -169,14 +165,6 @@ public:
return thread_id;
}
- TLSMemoryPtr& GetTLSMemory() {
- return tls_memory;
- }
-
- const TLSMemoryPtr& GetTLSMemory() const {
- return tls_memory;
- }
-
/// Resumes a thread from waiting
void ResumeFromWait();
@@ -463,11 +451,9 @@ private:
u32 ideal_core{0xFFFFFFFF};
u64 affinity_mask{0x1};
- TLSMemoryPtr tls_memory = std::make_shared<TLSMemory>();
+ ThreadActivity activity = ThreadActivity::Normal;
std::string name;
-
- ThreadActivity activity = ThreadActivity::Normal;
};
/**