1
0
Fork 0
forked from suyu/suyu
suyu/src/core/hle/kernel/process.cpp
Zach Hilman fc0bf91a96 kernel: Differentiate kernel and user processes when picking ID
This allows kernel internal type processes to be assigned IDs in the KIP range while userland processes are assigned in the user range.
2019-06-10 00:28:33 -04:00

285 lines
10 KiB
C++

// Copyright 2015 Citra Emulator Project
// Licensed under GPLv2 or any later version
// Refer to the license.txt file included.
#include <algorithm>
#include <memory>
#include <random>
#include "common/alignment.h"
#include "common/assert.h"
#include "common/logging/log.h"
#include "core/core.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/process.h"
#include "core/hle/kernel/resource_limit.h"
#include "core/hle/kernel/scheduler.h"
#include "core/hle/kernel/thread.h"
#include "core/hle/kernel/vm_manager.h"
#include "core/memory.h"
#include "core/settings.h"
namespace Kernel {
namespace {
/**
* Sets up the primary application thread
*
* @param owner_process The parent process for the main thread
* @param kernel The kernel instance to create the main thread under.
* @param priority The priority to give the main thread
*/
void SetupMainThread(Process& owner_process, KernelCore& kernel, u32 priority) {
const auto& vm_manager = owner_process.VMManager();
const VAddr entry_point = vm_manager.GetCodeRegionBaseAddress();
const VAddr stack_top = vm_manager.GetTLSIORegionEndAddress();
auto thread_res = Thread::Create(kernel, "main", entry_point, priority, 0,
owner_process.GetIdealCore(), stack_top, owner_process);
SharedPtr<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->GetContext().cpu_registers[1] = thread_handle;
// Threads by default are dormant, wake up the main thread so it runs when the scheduler fires
thread->ResumeFromWait();
}
} // Anonymous namespace
SharedPtr<Process> Process::Create(Core::System& system, std::string name,
Process::ProcessType type) {
auto& kernel = system.Kernel();
SharedPtr<Process> process(new Process(system));
process->name = std::move(name);
process->resource_limit = kernel.GetSystemResourceLimit();
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.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;
}
SharedPtr<ResourceLimit> Process::GetResourceLimit() const {
return resource_limit;
}
u64 Process::GetTotalPhysicalMemoryAvailable() const {
return vm_manager.GetTotalPhysicalMemoryAvailable();
}
u64 Process::GetTotalPhysicalMemoryAvailableWithoutMmHeap() const {
// TODO: Subtract the personal heap size from this when the
// personal heap is implemented.
return GetTotalPhysicalMemoryAvailable();
}
u64 Process::GetTotalPhysicalMemoryUsed() const {
return vm_manager.GetCurrentHeapSize() + main_thread_stack_size + code_memory_size;
}
u64 Process::GetTotalPhysicalMemoryUsedWithoutMmHeap() const {
// TODO: Subtract the personal heap size from this when the
// personal heap is implemented.
return GetTotalPhysicalMemoryUsed();
}
void Process::RegisterThread(const Thread* thread) {
thread_list.push_back(thread);
}
void Process::UnregisterThread(const Thread* thread) {
thread_list.remove(thread);
}
ResultCode Process::ClearSignalState() {
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) {
program_id = metadata.GetTitleID();
ideal_core = metadata.GetMainThreadCore();
is_64bit_process = metadata.Is64BitProgram();
vm_manager.Reset(metadata.GetAddressSpaceType());
const auto& caps = metadata.GetKernelCapabilities();
const auto capability_init_result =
capabilities.InitializeForUserProcess(caps.data(), caps.size(), vm_manager);
if (capability_init_result.IsError()) {
return capability_init_result;
}
return handle_table.SetSize(capabilities.GetHandleTableSize());
}
void Process::Run(s32 main_thread_priority, u64 stack_size) {
// The kernel always ensures that the given stack size is page aligned.
main_thread_stack_size = Common::AlignUp(stack_size, Memory::PAGE_SIZE);
// Allocate and map the main thread stack
// TODO(bunnei): This is heap area that should be allocated by the kernel and not mapped as part
// of the user address space.
const VAddr mapping_address = vm_manager.GetTLSIORegionEndAddress() - main_thread_stack_size;
vm_manager
.MapMemoryBlock(mapping_address, std::make_shared<std::vector<u8>>(main_thread_stack_size),
0, main_thread_stack_size, MemoryState::Stack)
.Unwrap();
vm_manager.LogLayout();
ChangeStatus(ProcessStatus::Running);
SetupMainThread(*this, kernel, main_thread_priority);
}
void Process::PrepareForTermination() {
ChangeStatus(ProcessStatus::Exiting);
const auto stop_threads = [this](const std::vector<SharedPtr<Thread>>& thread_list) {
for (auto& thread : thread_list) {
if (thread->GetOwnerProcess() != this)
continue;
if (thread == 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.Scheduler(0).GetThreadList());
stop_threads(system.Scheduler(1).GetThreadList());
stop_threads(system.Scheduler(2).GetThreadList());
stop_threads(system.Scheduler(3).GetThreadList());
ChangeStatus(ProcessStatus::Exited);
}
/**
* 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).
*/
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);
}
VAddr Process::MarkNextAvailableTLSSlotAsUsed(Thread& thread) {
auto [available_page, available_slot, needs_allocation] = FindFreeThreadLocalSlot(tls_slots);
const VAddr tls_begin = vm_manager.GetTLSIORegionBaseAddress();
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
// 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);
vm_manager.RefreshMemoryBlockMappings(tls_memory.get());
vm_manager.MapMemoryBlock(tls_begin + available_page * Memory::PAGE_SIZE, tls_memory, 0,
Memory::PAGE_SIZE, MemoryState::ThreadLocal);
}
tls_slots[available_page].set(available_slot);
return tls_begin + available_page * Memory::PAGE_SIZE + available_slot * Memory::TLS_ENTRY_SIZE;
}
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;
tls_slots[tls_page].reset(tls_slot);
}
void Process::LoadModule(CodeSet module_, VAddr base_addr) {
const auto memory = std::make_shared<std::vector<u8>>(std::move(module_.memory));
const auto MapSegment = [&](const CodeSet::Segment& segment, VMAPermission permissions,
MemoryState memory_state) {
const auto vma = vm_manager
.MapMemoryBlock(segment.addr + base_addr, memory, segment.offset,
segment.size, memory_state)
.Unwrap();
vm_manager.Reprotect(vma, permissions);
};
// Map CodeSet segments
MapSegment(module_.CodeSegment(), VMAPermission::ReadExecute, MemoryState::Code);
MapSegment(module_.RODataSegment(), VMAPermission::Read, MemoryState::CodeData);
MapSegment(module_.DataSegment(), VMAPermission::ReadWrite, MemoryState::CodeData);
code_memory_size += module_.memory.size();
}
Process::Process(Core::System& system)
: WaitObject{system.Kernel()}, vm_manager{system},
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;
WakeupAllWaitingThreads();
}
} // namespace Kernel