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suyu/src/core/hle/kernel/process.cpp
Lioncash 52e83f0d5c kernel/handle_table: Remove usages of the global system instance 
Removes even more usages of the global system instance, trimming away
more dependencies on global variables and making them explicit in the
interface.
2020-07-15 13:40:15 -04:00

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// Copyright 2015 Citra Emulator Project
// Licensed under GPLv2 or any later version
// Refer to the license.txt file included.
#include <algorithm>
#include <bitset>
#include <memory>
#include <random>
#include "common/alignment.h"
#include "common/assert.h"
#include "common/logging/log.h"
#include "core/core.h"
#include "core/device_memory.h"
#include "core/file_sys/program_metadata.h"
#include "core/hle/kernel/code_set.h"
#include "core/hle/kernel/errors.h"
#include "core/hle/kernel/kernel.h"
#include "core/hle/kernel/memory/memory_block_manager.h"
#include "core/hle/kernel/memory/page_table.h"
#include "core/hle/kernel/memory/slab_heap.h"
#include "core/hle/kernel/process.h"
#include "core/hle/kernel/resource_limit.h"
#include "core/hle/kernel/scheduler.h"
#include "core/hle/kernel/thread.h"
#include "core/hle/lock.h"
#include "core/memory.h"
#include "core/settings.h"
namespace Kernel {
namespace {
/**
* Sets up the primary application thread
*
* @param system The system instance to create the main thread under.
* @param owner_process The parent process for the main thread
* @param priority The priority to give the main thread
*/
void SetupMainThread(Core::System& system, Process& owner_process, u32 priority, VAddr stack_top) {
const VAddr entry_point = owner_process.PageTable().GetCodeRegionStart();
ThreadType type = THREADTYPE_USER;
auto thread_res = Thread::Create(system, type, "main", entry_point, priority, 0,
owner_process.GetIdealCore(), stack_top, &owner_process);
std::shared_ptr<Thread> thread = std::move(thread_res).Unwrap();
// Register 1 must be a handle to the main thread
const Handle thread_handle = owner_process.GetHandleTable().Create(thread).Unwrap();
thread->GetContext32().cpu_registers[0] = 0;
thread->GetContext64().cpu_registers[0] = 0;
thread->GetContext32().cpu_registers[1] = thread_handle;
thread->GetContext64().cpu_registers[1] = thread_handle;
auto& kernel = system.Kernel();
// Threads by default are dormant, wake up the main thread so it runs when the scheduler fires
{
SchedulerLock lock{kernel};
thread->SetStatus(ThreadStatus::Ready);
}
}
} // Anonymous namespace
// 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 =
Core::Memory::PAGE_SIZE / Core::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 * Core::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 % Core::Memory::TLS_ENTRY_SIZE) == 0);
const std::size_t index = (address - base_address) / Core::Memory::TLS_ENTRY_SIZE;
is_slot_used[index] = false;
}
private:
bool IsWithinPage(VAddr address) const {
return base_address <= address && address < base_address + Core::Memory::PAGE_SIZE;
}
VAddr base_address;
std::bitset<num_slot_entries> is_slot_used;
};
std::shared_ptr<Process> Process::Create(Core::System& system, std::string name, ProcessType type) {
auto& kernel = system.Kernel();
std::shared_ptr<Process> process = std::make_shared<Process>(system);
process->name = std::move(name);
process->resource_limit = ResourceLimit::Create(kernel);
process->status = ProcessStatus::Created;
process->program_id = 0;
process->process_id = type == ProcessType::KernelInternal ? kernel.CreateNewKernelProcessID()
: kernel.CreateNewUserProcessID();
process->capabilities.InitializeForMetadatalessProcess();
std::mt19937 rng(Settings::values.rng_seed.GetValue().value_or(0));
std::uniform_int_distribution<u64> distribution;
std::generate(process->random_entropy.begin(), process->random_entropy.end(),
[&] { return distribution(rng); });
kernel.AppendNewProcess(process);
return process;
}
std::shared_ptr<ResourceLimit> Process::GetResourceLimit() const {
return resource_limit;
}
u64 Process::GetTotalPhysicalMemoryAvailable() const {
const u64 capacity{resource_limit->GetCurrentResourceValue(ResourceType::PhysicalMemory) +
page_table->GetTotalHeapSize() + GetSystemResourceSize() + image_size +
main_thread_stack_size};
if (capacity < memory_usage_capacity) {
return capacity;
}
return memory_usage_capacity;
}
u64 Process::GetTotalPhysicalMemoryAvailableWithoutSystemResource() const {
return GetTotalPhysicalMemoryAvailable() - GetSystemResourceSize();
}
u64 Process::GetTotalPhysicalMemoryUsed() const {
return image_size + main_thread_stack_size + page_table->GetTotalHeapSize() +
GetSystemResourceSize();
}
u64 Process::GetTotalPhysicalMemoryUsedWithoutSystemResource() const {
return GetTotalPhysicalMemoryUsed() - GetSystemResourceUsage();
}
void Process::InsertConditionVariableThread(std::shared_ptr<Thread> thread) {
VAddr cond_var_addr = thread->GetCondVarWaitAddress();
std::list<std::shared_ptr<Thread>>& thread_list = cond_var_threads[cond_var_addr];
auto it = thread_list.begin();
while (it != thread_list.end()) {
const std::shared_ptr<Thread> current_thread = *it;
if (current_thread->GetPriority() > thread->GetPriority()) {
thread_list.insert(it, thread);
return;
}
++it;
}
thread_list.push_back(thread);
}
void Process::RemoveConditionVariableThread(std::shared_ptr<Thread> thread) {
VAddr cond_var_addr = thread->GetCondVarWaitAddress();
std::list<std::shared_ptr<Thread>>& thread_list = cond_var_threads[cond_var_addr];
auto it = thread_list.begin();
while (it != thread_list.end()) {
const std::shared_ptr<Thread> current_thread = *it;
if (current_thread.get() == thread.get()) {
thread_list.erase(it);
return;
}
++it;
}
}
std::vector<std::shared_ptr<Thread>> Process::GetConditionVariableThreads(
const VAddr cond_var_addr) {
std::vector<std::shared_ptr<Thread>> result{};
std::list<std::shared_ptr<Thread>>& thread_list = cond_var_threads[cond_var_addr];
auto it = thread_list.begin();
while (it != thread_list.end()) {
std::shared_ptr<Thread> current_thread = *it;
result.push_back(current_thread);
++it;
}
return result;
}
void Process::RegisterThread(const Thread* thread) {
thread_list.push_back(thread);
}
void Process::UnregisterThread(const Thread* thread) {
thread_list.remove(thread);
}
ResultCode Process::ClearSignalState() {
SchedulerLock lock(system.Kernel());
if (status == ProcessStatus::Exited) {
LOG_ERROR(Kernel, "called on a terminated process instance.");
return ERR_INVALID_STATE;
}
if (!is_signaled) {
LOG_ERROR(Kernel, "called on a process instance that isn't signaled.");
return ERR_INVALID_STATE;
}
is_signaled = false;
return RESULT_SUCCESS;
}
ResultCode Process::LoadFromMetadata(const FileSys::ProgramMetadata& metadata,
std::size_t code_size) {
program_id = metadata.GetTitleID();
ideal_core = metadata.GetMainThreadCore();
is_64bit_process = metadata.Is64BitProgram();
system_resource_size = metadata.GetSystemResourceSize();
image_size = code_size;
// Initialize proces address space
if (const ResultCode result{
page_table->InitializeForProcess(metadata.GetAddressSpaceType(), false, 0x8000000,
code_size, Memory::MemoryManager::Pool::Application)};
result.IsError()) {
return result;
}
// Map process code region
if (const ResultCode result{page_table->MapProcessCode(
page_table->GetCodeRegionStart(), code_size / Memory::PageSize,
Memory::MemoryState::Code, Memory::MemoryPermission::None)};
result.IsError()) {
return result;
}
// Initialize process capabilities
const auto& caps{metadata.GetKernelCapabilities()};
if (const ResultCode result{
capabilities.InitializeForUserProcess(caps.data(), caps.size(), *page_table)};
result.IsError()) {
return result;
}
// Set memory usage capacity
switch (metadata.GetAddressSpaceType()) {
case FileSys::ProgramAddressSpaceType::Is32Bit:
case FileSys::ProgramAddressSpaceType::Is36Bit:
case FileSys::ProgramAddressSpaceType::Is39Bit:
memory_usage_capacity = page_table->GetHeapRegionEnd() - page_table->GetHeapRegionStart();
break;
case FileSys::ProgramAddressSpaceType::Is32BitNoMap:
memory_usage_capacity = page_table->GetHeapRegionEnd() - page_table->GetHeapRegionStart() +
page_table->GetAliasRegionEnd() - page_table->GetAliasRegionStart();
break;
default:
UNREACHABLE();
}
// Set initial resource limits
resource_limit->SetLimitValue(
ResourceType::PhysicalMemory,
kernel.MemoryManager().GetSize(Memory::MemoryManager::Pool::Application));
resource_limit->SetLimitValue(ResourceType::Threads, 608);
resource_limit->SetLimitValue(ResourceType::Events, 700);
resource_limit->SetLimitValue(ResourceType::TransferMemory, 128);
resource_limit->SetLimitValue(ResourceType::Sessions, 894);
ASSERT(resource_limit->Reserve(ResourceType::PhysicalMemory, code_size));
// Create TLS region
tls_region_address = CreateTLSRegion();
return handle_table.SetSize(capabilities.GetHandleTableSize());
}
void Process::Run(s32 main_thread_priority, u64 stack_size) {
AllocateMainThreadStack(stack_size);
const std::size_t heap_capacity{memory_usage_capacity - main_thread_stack_size - image_size};
ASSERT(!page_table->SetHeapCapacity(heap_capacity).IsError());
ChangeStatus(ProcessStatus::Running);
SetupMainThread(system, *this, main_thread_priority, main_thread_stack_top);
resource_limit->Reserve(ResourceType::Threads, 1);
resource_limit->Reserve(ResourceType::PhysicalMemory, main_thread_stack_size);
}
void Process::PrepareForTermination() {
ChangeStatus(ProcessStatus::Exiting);
const auto stop_threads = [this](const std::vector<std::shared_ptr<Thread>>& thread_list) {
for (auto& thread : thread_list) {
if (thread->GetOwnerProcess() != this)
continue;
if (thread.get() == system.CurrentScheduler().GetCurrentThread())
continue;
// TODO(Subv): When are the other running/ready threads terminated?
ASSERT_MSG(thread->GetStatus() == ThreadStatus::WaitSynch,
"Exiting processes with non-waiting threads is currently unimplemented");
thread->Stop();
}
};
stop_threads(system.GlobalScheduler().GetThreadList());
FreeTLSRegion(tls_region_address);
tls_region_address = 0;
ChangeStatus(ProcessStatus::Exited);
}
/**
* 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 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::CreateTLSRegion() {
SchedulerLock lock(system.Kernel());
if (auto tls_page_iter{FindTLSPageWithAvailableSlots(tls_pages)};
tls_page_iter != tls_pages.cend()) {
return *tls_page_iter->ReserveSlot();
}
Memory::Page* const tls_page_ptr{kernel.GetUserSlabHeapPages().Allocate()};
ASSERT(tls_page_ptr);
const VAddr start{page_table->GetKernelMapRegionStart()};
const VAddr size{page_table->GetKernelMapRegionEnd() - start};
const PAddr tls_map_addr{system.DeviceMemory().GetPhysicalAddr(tls_page_ptr)};
const VAddr tls_page_addr{
page_table
->AllocateAndMapMemory(1, Memory::PageSize, true, start, size / Memory::PageSize,
Memory::MemoryState::ThreadLocal,
Memory::MemoryPermission::ReadAndWrite, tls_map_addr)
.ValueOr(0)};
ASSERT(tls_page_addr);
std::memset(tls_page_ptr, 0, Memory::PageSize);
tls_pages.emplace_back(tls_page_addr);
const auto reserve_result{tls_pages.back().ReserveSlot()};
ASSERT(reserve_result.has_value());
return *reserve_result;
}
void Process::FreeTLSRegion(VAddr tls_address) {
SchedulerLock lock(system.Kernel());
const VAddr aligned_address = Common::AlignDown(tls_address, Core::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());
iter->ReleaseSlot(tls_address);
}
void Process::LoadModule(CodeSet code_set, VAddr base_addr) {
std::lock_guard lock{HLE::g_hle_lock};
const auto ReprotectSegment = [&](const CodeSet::Segment& segment,
Memory::MemoryPermission permission) {
page_table->SetCodeMemoryPermission(segment.addr + base_addr, segment.size, permission);
};
system.Memory().WriteBlock(*this, base_addr, code_set.memory.data(), code_set.memory.size());
ReprotectSegment(code_set.CodeSegment(), Memory::MemoryPermission::ReadAndExecute);
ReprotectSegment(code_set.RODataSegment(), Memory::MemoryPermission::Read);
ReprotectSegment(code_set.DataSegment(), Memory::MemoryPermission::ReadAndWrite);
}
Process::Process(Core::System& system)
: SynchronizationObject{system.Kernel()}, page_table{std::make_unique<Memory::PageTable>(
system)},
handle_table{system.Kernel()}, address_arbiter{system}, mutex{system}, system{system} {}
Process::~Process() = default;
void Process::Acquire(Thread* thread) {
ASSERT_MSG(!ShouldWait(thread), "Object unavailable!");
}
bool Process::ShouldWait(const Thread* thread) const {
return !is_signaled;
}
void Process::ChangeStatus(ProcessStatus new_status) {
if (status == new_status) {
return;
}
status = new_status;
is_signaled = true;
Signal();
}
ResultCode Process::AllocateMainThreadStack(std::size_t stack_size) {
ASSERT(stack_size);
// The kernel always ensures that the given stack size is page aligned.
main_thread_stack_size = Common::AlignUp(stack_size, Memory::PageSize);
const VAddr start{page_table->GetStackRegionStart()};
const std::size_t size{page_table->GetStackRegionEnd() - start};
CASCADE_RESULT(main_thread_stack_top,
page_table->AllocateAndMapMemory(
main_thread_stack_size / Memory::PageSize, Memory::PageSize, false, start,
size / Memory::PageSize, Memory::MemoryState::Stack,
Memory::MemoryPermission::ReadAndWrite));
main_thread_stack_top += main_thread_stack_size;
return RESULT_SUCCESS;
}
} // namespace Kernel
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