diff options
| -rw-r--r-- | src/core/hle/kernel/process.cpp | 135 | ||||
| -rw-r--r-- | src/core/hle/kernel/process.h | 12 | ||||
| -rw-r--r-- | src/core/hle/kernel/thread.cpp | 4 | ||||
| -rw-r--r-- | src/core/hle/kernel/thread.h | 16 | ||||
| -rw-r--r-- | src/core/hle/kernel/vm_manager.cpp | 31 | ||||
| -rw-r--r-- | src/core/hle/kernel/vm_manager.h | 31 |
6 files changed, 148 insertions, 81 deletions
diff --git a/src/core/hle/kernel/process.cpp b/src/core/hle/kernel/process.cpp index 7cfc513a1..f45ef05f6 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()); - tls_slots[available_page].set(available_slot); + return *reserve_result; + } - 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; + }); + + // Something has gone very wrong if we're freeing a region + // with no actual page available. + ASSERT(iter != tls_pages.cend()); - tls_slots[tls_page].reset(tls_slot); + 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 248fd3840..83ea02bee 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); @@ -290,7 +290,7 @@ private: u64 code_memory_size = 0; /// Current status of the process - ProcessStatus status; + ProcessStatus status{}; /// The ID of this process u64 process_id = 0; @@ -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; @@ -339,7 +339,7 @@ private: Mutex mutex; /// Random values for svcGetInfo RandomEntropy - std::array<u64, RANDOM_ENTROPY_SIZE> random_entropy; + std::array<u64, RANDOM_ENTROPY_SIZE> random_entropy{}; /// List of threads that are running with this process as their owner. std::list<const Thread*> thread_list; diff --git a/src/core/hle/kernel/thread.cpp b/src/core/hle/kernel/thread.cpp index a055a5002..ec529e7f2 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 b4b9cda7c..07e989637 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; }; /** diff --git a/src/core/hle/kernel/vm_manager.cpp b/src/core/hle/kernel/vm_manager.cpp index c929c2a52..3df5ccb7f 100644 --- a/src/core/hle/kernel/vm_manager.cpp +++ b/src/core/hle/kernel/vm_manager.cpp @@ -152,22 +152,33 @@ ResultVal<VMManager::VMAHandle> VMManager::MapBackingMemory(VAddr target, u8* me } ResultVal<VAddr> VMManager::FindFreeRegion(u64 size) const { - // Find the first Free VMA. - const VAddr base = GetASLRRegionBaseAddress(); - const VMAHandle vma_handle = std::find_if(vma_map.begin(), vma_map.end(), [&](const auto& vma) { - if (vma.second.type != VMAType::Free) - return false; + return FindFreeRegion(GetASLRRegionBaseAddress(), GetASLRRegionEndAddress(), size); +} - const VAddr vma_end = vma.second.base + vma.second.size; - return vma_end > base && vma_end >= base + size; - }); +ResultVal<VAddr> VMManager::FindFreeRegion(VAddr begin, VAddr end, u64 size) const { + ASSERT(begin < end); + ASSERT(size <= end - begin); - if (vma_handle == vma_map.end()) { + const VMAHandle vma_handle = + std::find_if(vma_map.begin(), vma_map.end(), [begin, end, size](const auto& vma) { + if (vma.second.type != VMAType::Free) { + return false; + } + const VAddr vma_base = vma.second.base; + const VAddr vma_end = vma_base + vma.second.size; + const VAddr assumed_base = (begin < vma_base) ? vma_base : begin; + const VAddr used_range = assumed_base + size; + + return vma_base <= assumed_base && assumed_base < used_range && used_range < end && + used_range <= vma_end; + }); + + if (vma_handle == vma_map.cend()) { // TODO(Subv): Find the correct error code here. return ResultCode(-1); } - const VAddr target = std::max(base, vma_handle->second.base); + const VAddr target = std::max(begin, vma_handle->second.base); return MakeResult<VAddr>(target); } diff --git a/src/core/hle/kernel/vm_manager.h b/src/core/hle/kernel/vm_manager.h index dfbf7a894..752ae62f9 100644 --- a/src/core/hle/kernel/vm_manager.h +++ b/src/core/hle/kernel/vm_manager.h @@ -362,14 +362,39 @@ public: ResultVal<VMAHandle> MapBackingMemory(VAddr target, u8* memory, u64 size, MemoryState state); /** - * Finds the first free address that can hold a region of the desired size. + * Finds the first free memory region of the given size within + * the user-addressable ASLR memory region. * - * @param size Size of the desired region. - * @return The found free address. + * @param size The size of the desired region in bytes. + * + * @returns If successful, the base address of the free region with + * the given size. */ ResultVal<VAddr> FindFreeRegion(u64 size) const; /** + * Finds the first free address range that can hold a region of the desired size + * + * @param begin The starting address of the range. + * This is treated as an inclusive beginning address. + * + * @param end The ending address of the range. + * This is treated as an exclusive ending address. + * + * @param size The size of the free region to attempt to locate, + * in bytes. + * + * @returns If successful, the base address of the free region with + * the given size. + * + * @returns If unsuccessful, a result containing an error code. + * + * @pre The starting address must be less than the ending address. + * @pre The size must not exceed the address range itself. + */ + ResultVal<VAddr> FindFreeRegion(VAddr begin, VAddr end, u64 size) const; + + /** * Maps a memory-mapped IO region at a given address. * * @param target The guest address to start the mapping at. |