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kern: implement SvcArbitrateLock, SvcArbitrateUnlock

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This commit is contained in:
Michael Scire 2020-07-09 20:45:26 -07:00
parent f4fd4cbbb2
commit 4f12449acf
3 changed files with 114 additions and 6 deletions
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3
libraries/libmesosphere/include/mesosphere/kern_k_thread.hpp
View file

@ -314,7 +314,10 @@ namespace ams::kern {
KThread *RemoveWaiterByKey(s32 *out_num_waiters, KProcessAddress key);
constexpr KProcessAddress GetAddressKey() const { return this->arbiter_key; }
constexpr u32 GetAddressKeyValue() const { return this->arbiter_value; }
constexpr void SetAddressKey(KProcessAddress key) { this->arbiter_key = key; }
constexpr void SetAddressKey(KProcessAddress key, u32 val) { this->arbiter_key = key; this->arbiter_value = val; }
constexpr void SetLockOwner(KThread *owner) { this->lock_owner = owner; }
constexpr KThread *GetLockOwner() const { return this->lock_owner; }

89
libraries/libmesosphere/source/kern_k_condition_variable.cpp
View file

@ -21,14 +21,99 @@ namespace ams::kern {
constinit KThread g_cv_compare_thread;
ALWAYS_INLINE bool ReadFromUser(u32 *out, KProcessAddress address) {
return UserspaceAccess::CopyMemoryFromUserSize32Bit(out, GetVoidPointer(address));
}
ALWAYS_INLINE bool WriteToUser(KProcessAddress address, const u32 *p) {
return UserspaceAccess::CopyMemoryToUserSize32Bit(GetVoidPointer(address), p);
}
}
Result KConditionVariable::SignalToAddress(KProcessAddress addr) {
MESOSPHERE_UNIMPLEMENTED();
KThread *owner_thread = std::addressof(GetCurrentThread());
/* Signal the address. */
{
KScopedSchedulerLock sl;
/* Remove waiter thread. */
s32 num_waiters;
KThread *next_owner_thread = owner_thread->RemoveWaiterByKey(std::addressof(num_waiters), addr);
/* Determine the next tag. */
u32 next_value = 0;
if (next_owner_thread) {
next_value = next_owner_thread->GetAddressKeyValue();
if (num_waiters > 1) {
next_value |= ams::svc::HandleWaitMask;
}
next_owner_thread->SetSyncedObject(nullptr, ResultSuccess());
next_owner_thread->Wakeup();
}
/* Write the value to userspace. */
if (!WriteToUser(addr, std::addressof(next_value))) {
if (next_owner_thread) {
next_owner_thread->SetSyncedObject(nullptr, svc::ResultInvalidCurrentMemory());
}
return svc::ResultInvalidCurrentMemory();
}
}
return ResultSuccess();
}
Result KConditionVariable::WaitForAddress(ams::svc::Handle handle, KProcessAddress addr, u32 value) {
MESOSPHERE_UNIMPLEMENTED();
KThread *cur_thread = std::addressof(GetCurrentThread());
/* Wait for the address. */
{
KScopedAutoObject<KThread> owner_thread;
MESOSPHERE_ASSERT(owner_thread.IsNull());
{
KScopedSchedulerLock sl;
cur_thread->SetSyncedObject(nullptr, ResultSuccess());
/* Check if the thread should terminate. */
R_UNLESS(!cur_thread->IsTerminationRequested(), svc::ResultTerminationRequested());
{
/* Read the tag from userspace. */
u32 test_tag;
R_UNLESS(ReadFromUser(std::addressof(test_tag), addr), svc::ResultInvalidCurrentMemory());
/* If the tag isn't the handle (with wait mask), we're done. */
R_SUCCEED_IF(test_tag != (handle | ams::svc::HandleWaitMask));
/* Get the lock owner thread. */
owner_thread = GetCurrentProcess().GetHandleTable().GetObject<KThread>(handle);
R_UNLESS(owner_thread.IsNotNull(), svc::ResultInvalidHandle());
/* Update the lock. */
cur_thread->SetAddressKey(addr, value);
owner_thread->AddWaiter(cur_thread);
cur_thread->SetState(KThread::ThreadState_Waiting);
}
}
MESOSPHERE_ASSERT(owner_thread.IsNotNull());
}
/* Remove the thread as a waiter from the lock owner. */
{
KScopedSchedulerLock sl;
KThread *owner_thread = cur_thread->GetLockOwner();
if (owner_thread != nullptr) {
owner_thread->RemoveWaiter(cur_thread);
}
}
/* Get the wait result. */
KSynchronizationObject *dummy;
return cur_thread->GetWaitResult(std::addressof(dummy));
}
KThread *KConditionVariable::SignalImpl(KThread *thread) {

28
libraries/libmesosphere/source/svc/kern_svc_lock.cpp
View file

@ -21,28 +21,48 @@ namespace ams::kern::svc {
namespace {
constexpr bool IsKernelAddress(uintptr_t address) {
return KernelVirtualAddressSpaceBase <= address && address < KernelVirtualAddressSpaceEnd;
}
Result ArbitrateLock(ams::svc::Handle thread_handle, uintptr_t address, uint32_t tag) {
/* Validate the input address. */
R_UNLESS(!IsKernelAddress(address), svc::ResultInvalidCurrentMemory());
R_UNLESS(util::IsAligned(address, sizeof(u32)), svc::ResultInvalidAddress());
MESOSPHERE_LOG("%lx: ArbitrateLock(%08x, %lx, %08x)\n", GetCurrentThread().GetId(), thread_handle, address, tag);
return GetCurrentProcess().WaitForAddress(thread_handle, address, tag);
}
Result ArbitrateUnlock(uintptr_t address) {
/* Validate the input address. */
R_UNLESS(!IsKernelAddress(address), svc::ResultInvalidCurrentMemory());
R_UNLESS(util::IsAligned(address, sizeof(u32)), svc::ResultInvalidAddress());
MESOSPHERE_LOG("%lx: ArbitrateUnlock(%lx)\n", GetCurrentThread().GetId(), address);
return GetCurrentProcess().SignalToAddress(address);
}
}
/* ============================= 64 ABI ============================= */
Result ArbitrateLock64(ams::svc::Handle thread_handle, ams::svc::Address address, uint32_t tag) {
MESOSPHERE_PANIC("Stubbed SvcArbitrateLock64 was called.");
return ArbitrateLock(thread_handle, address, tag);
}
Result ArbitrateUnlock64(ams::svc::Address address) {
MESOSPHERE_PANIC("Stubbed SvcArbitrateUnlock64 was called.");
return ArbitrateUnlock(address);
}
/* ============================= 64From32 ABI ============================= */
Result ArbitrateLock64From32(ams::svc::Handle thread_handle, ams::svc::Address address, uint32_t tag) {
MESOSPHERE_PANIC("Stubbed SvcArbitrateLock64From32 was called.");
return ArbitrateLock(thread_handle, address, tag);
}
Result ArbitrateUnlock64From32(ams::svc::Address address) {
MESOSPHERE_PANIC("Stubbed SvcArbitrateUnlock64From32 was called.");
return ArbitrateUnlock(address);
}
}