mirror of
https://github.com/Atmosphere-NX/Atmosphere.git
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307 lines
16 KiB
C++
307 lines
16 KiB
C++
/*
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* Copyright (c) 2018-2020 Atmosphère-NX
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms and conditions of the GNU General Public License,
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* version 2, as published by the Free Software Foundation.
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*
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* This program is distributed in the hope it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <mesosphere.hpp>
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namespace ams::kern::svc {
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/* ============================= Common ============================= */
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namespace {
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ALWAYS_INLINE Result SendSyncRequestImpl(uintptr_t message, size_t buffer_size, ams::svc::Handle session_handle) {
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/* Get the client session. */
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KScopedAutoObject session = GetCurrentProcess().GetHandleTable().GetObject<KClientSession>(session_handle);
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R_UNLESS(session.IsNotNull(), svc::ResultInvalidHandle());
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/* Get the parent, and persist a reference to it until we're done. */
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KScopedAutoObject parent = session->GetParent();
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MESOSPHERE_ASSERT(parent.IsNotNull());
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/* Send the request. */
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return session->SendSyncRequest(message, buffer_size);
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}
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ALWAYS_INLINE Result ReplyAndReceiveImpl(int32_t *out_index, uintptr_t message, size_t buffer_size, KPhysicalAddress message_paddr, KSynchronizationObject **objs, int32_t num_objects, ams::svc::Handle reply_target, int64_t timeout_ns) {
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/* Reply to the target, if one is specified. */
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if (reply_target != ams::svc::InvalidHandle) {
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KScopedAutoObject session = GetCurrentProcess().GetHandleTable().GetObject<KServerSession>(reply_target);
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R_UNLESS(session.IsNotNull(), svc::ResultInvalidHandle());
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/* If we fail to reply, we want to set the output index to -1. */
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auto reply_idx_guard = SCOPE_GUARD { *out_index = -1; };
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/* Send the reply. */
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R_TRY(session->SendReply(message, buffer_size, message_paddr));
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/* Cancel our guard. */
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reply_idx_guard.Cancel();
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}
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/* Receive a message. */
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{
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/* Convert the timeout from nanoseconds to ticks. */
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/* NOTE: Nintendo does not use this conversion logic in WaitSynchronization... */
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s64 timeout;
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if (timeout_ns > 0) {
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const ams::svc::Tick offset_tick(TimeSpan::FromNanoSeconds(timeout_ns));
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if (AMS_LIKELY(offset_tick > 0)) {
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timeout = KHardwareTimer::GetTick() + offset_tick + 2;
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if (AMS_UNLIKELY(timeout <= 0)) {
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timeout = std::numeric_limits<s64>::max();
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}
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} else {
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timeout = std::numeric_limits<s64>::max();
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}
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} else {
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timeout = timeout_ns;
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}
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/* Wait for a message. */
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while (true) {
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s32 index;
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Result result = KSynchronizationObject::Wait(std::addressof(index), objs, num_objects, timeout);
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if (svc::ResultTimedOut::Includes(result)) {
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return result;
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}
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if (R_SUCCEEDED(result)) {
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KServerSession *session = objs[index]->DynamicCast<KServerSession *>();
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if (session != nullptr) {
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result = session->ReceiveRequest(message, buffer_size, message_paddr);
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if (svc::ResultNotFound::Includes(result)) {
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continue;
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}
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}
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}
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*out_index = index;
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return result;
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}
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}
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}
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ALWAYS_INLINE Result ReplyAndReceiveImpl(int32_t *out_index, uintptr_t message, size_t buffer_size, KPhysicalAddress message_paddr, KUserPointer<const ams::svc::Handle *> user_handles, int32_t num_handles, ams::svc::Handle reply_target, int64_t timeout_ns) {
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/* Ensure number of handles is valid. */
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R_UNLESS(0 <= num_handles && num_handles <= ams::svc::ArgumentHandleCountMax, svc::ResultOutOfRange());
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/* Get the synchronization context. */
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auto &handle_table = GetCurrentProcess().GetHandleTable();
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KSynchronizationObject **objs = GetCurrentThread().GetSynchronizationObjectBuffer();
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ams::svc::Handle *handles = GetCurrentThread().GetHandleBuffer();
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/* Copy user handles. */
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if (num_handles > 0) {
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/* Ensure that we can try to get the handles. */
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R_UNLESS(GetCurrentProcess().GetPageTable().Contains(KProcessAddress(user_handles.GetUnsafePointer()), num_handles * sizeof(ams::svc::Handle)), svc::ResultInvalidPointer());
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/* Get the handles. */
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R_TRY(user_handles.CopyArrayTo(handles, num_handles));
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/* Convert the handles to objects. */
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R_UNLESS(handle_table.GetMultipleObjects<KSynchronizationObject>(objs, handles, num_handles), svc::ResultInvalidHandle());
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}
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/* Ensure handles are closed when we're done. */
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ON_SCOPE_EXIT {
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for (auto i = 0; i < num_handles; ++i) {
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objs[i]->Close();
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}
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};
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return ReplyAndReceiveImpl(out_index, message, buffer_size, message_paddr, objs, num_handles, reply_target, timeout_ns);
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}
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ALWAYS_INLINE Result SendSyncRequest(ams::svc::Handle session_handle) {
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return SendSyncRequestImpl(0, 0, session_handle);
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}
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ALWAYS_INLINE Result SendSyncRequestWithUserBuffer(uintptr_t message, size_t buffer_size, ams::svc::Handle session_handle) {
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/* Validate that the message buffer is page aligned and does not overflow. */
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R_UNLESS(util::IsAligned(message, PageSize), svc::ResultInvalidAddress());
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R_UNLESS(buffer_size > 0, svc::ResultInvalidSize());
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R_UNLESS(util::IsAligned(buffer_size, PageSize), svc::ResultInvalidSize());
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R_UNLESS(message < message + buffer_size, svc::ResultInvalidCurrentMemory());
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/* Get the process page table. */
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auto &page_table = GetCurrentProcess().GetPageTable();
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/* Lock the mesage buffer. */
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R_TRY(page_table.LockForIpcUserBuffer(nullptr, message, buffer_size));
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/* Ensure that even if we fail, we unlock the message buffer when done. */
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auto unlock_guard = SCOPE_GUARD { page_table.UnlockForIpcUserBuffer(message, buffer_size); };
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/* Send the request. */
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MESOSPHERE_ASSERT(message != 0);
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R_TRY(SendSyncRequestImpl(message, buffer_size, session_handle));
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/* We sent the request successfully, so cancel our guard and check the unlock result. */
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unlock_guard.Cancel();
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return page_table.UnlockForIpcUserBuffer(message, buffer_size);
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}
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ALWAYS_INLINE Result SendAsyncRequestWithUserBufferImpl(ams::svc::Handle *out_event_handle, uintptr_t message, size_t buffer_size, ams::svc::Handle session_handle) {
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/* Get the process and handle table. */
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auto &process = GetCurrentProcess();
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auto &handle_table = process.GetHandleTable();
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/* Reserve a new event from the process resource limit. */
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KScopedResourceReservation event_reservation(std::addressof(process), ams::svc::LimitableResource_EventCountMax);
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R_UNLESS(event_reservation.Succeeded(), svc::ResultLimitReached());
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/* Get the client session. */
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KScopedAutoObject session = GetCurrentProcess().GetHandleTable().GetObject<KClientSession>(session_handle);
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R_UNLESS(session.IsNotNull(), svc::ResultInvalidHandle());
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/* Get the parent, and persist a reference to it until we're done. */
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KScopedAutoObject parent = session->GetParent();
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MESOSPHERE_ASSERT(parent.IsNotNull());
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/* Create a new event. */
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KEvent *event = KEvent::Create();
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R_UNLESS(event != nullptr, svc::ResultOutOfResource());
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/* Initialize the event. */
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event->Initialize();
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/* Commit our reservation. */
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event_reservation.Commit();
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/* At end of scope, kill the standing references to the sub events. */
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ON_SCOPE_EXIT {
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event->GetReadableEvent().Close();
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event->GetWritableEvent().Close();
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};
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/* Register the event. */
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KEvent::Register(event);
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/* Add the readable event to the handle table. */
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R_TRY(handle_table.Add(out_event_handle, std::addressof(event->GetReadableEvent())));
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/* Ensure that if we fail to send the request, we close the readable handle. */
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auto read_guard = SCOPE_GUARD { handle_table.Remove(*out_event_handle); };
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/* Send the async request. */
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R_TRY(session->SendAsyncRequest(std::addressof(event->GetWritableEvent()), message, buffer_size));
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/* We succeeded. */
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read_guard.Cancel();
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return ResultSuccess();
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}
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ALWAYS_INLINE Result SendAsyncRequestWithUserBuffer(ams::svc::Handle *out_event_handle, uintptr_t message, size_t buffer_size, ams::svc::Handle session_handle) {
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/* Validate that the message buffer is page aligned and does not overflow. */
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R_UNLESS(util::IsAligned(message, PageSize), svc::ResultInvalidAddress());
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R_UNLESS(buffer_size > 0, svc::ResultInvalidSize());
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R_UNLESS(util::IsAligned(buffer_size, PageSize), svc::ResultInvalidSize());
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R_UNLESS(message < message + buffer_size, svc::ResultInvalidCurrentMemory());
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/* Get the process page table. */
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auto &page_table = GetCurrentProcess().GetPageTable();
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/* Lock the mesage buffer. */
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R_TRY(page_table.LockForIpcUserBuffer(nullptr, message, buffer_size));
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/* Ensure that if we fail, we unlock the message buffer. */
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auto unlock_guard = SCOPE_GUARD { page_table.UnlockForIpcUserBuffer(message, buffer_size); };
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/* Send the request. */
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MESOSPHERE_ASSERT(message != 0);
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R_TRY(SendAsyncRequestWithUserBufferImpl(out_event_handle, message, buffer_size, session_handle));
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/* We sent the request successfully. */
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unlock_guard.Cancel();
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return ResultSuccess();
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}
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ALWAYS_INLINE Result ReplyAndReceive(int32_t *out_index, KUserPointer<const ams::svc::Handle *> handles, int32_t num_handles, ams::svc::Handle reply_target, int64_t timeout_ns) {
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return ReplyAndReceiveImpl(out_index, 0, 0, Null<KPhysicalAddress>, handles, num_handles, reply_target, timeout_ns);
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}
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ALWAYS_INLINE Result ReplyAndReceiveWithUserBuffer(int32_t *out_index, uintptr_t message, size_t buffer_size, KUserPointer<const ams::svc::Handle *> handles, int32_t num_handles, ams::svc::Handle reply_target, int64_t timeout_ns) {
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/* Validate that the message buffer is page aligned and does not overflow. */
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R_UNLESS(util::IsAligned(message, PageSize), svc::ResultInvalidAddress());
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R_UNLESS(buffer_size > 0, svc::ResultInvalidSize());
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R_UNLESS(util::IsAligned(buffer_size, PageSize), svc::ResultInvalidSize());
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R_UNLESS(message < message + buffer_size, svc::ResultInvalidCurrentMemory());
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/* Get the process page table. */
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auto &page_table = GetCurrentProcess().GetPageTable();
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/* Lock the mesage buffer, getting its physical address. */
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KPhysicalAddress message_paddr;
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R_TRY(page_table.LockForIpcUserBuffer(std::addressof(message_paddr), message, buffer_size));
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/* Ensure that even if we fail, we unlock the message buffer when done. */
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auto unlock_guard = SCOPE_GUARD { page_table.UnlockForIpcUserBuffer(message, buffer_size); };
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/* Send the request. */
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MESOSPHERE_ASSERT(message != 0);
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R_TRY(ReplyAndReceiveImpl(out_index, message, buffer_size, message_paddr, handles, num_handles, reply_target, timeout_ns));
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/* We sent the request successfully, so cancel our guard and check the unlock result. */
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unlock_guard.Cancel();
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return page_table.UnlockForIpcUserBuffer(message, buffer_size);
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}
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}
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/* ============================= 64 ABI ============================= */
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Result SendSyncRequest64(ams::svc::Handle session_handle) {
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return SendSyncRequest(session_handle);
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}
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Result SendSyncRequestWithUserBuffer64(ams::svc::Address message_buffer, ams::svc::Size message_buffer_size, ams::svc::Handle session_handle) {
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return SendSyncRequestWithUserBuffer(message_buffer, message_buffer_size, session_handle);
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}
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Result SendAsyncRequestWithUserBuffer64(ams::svc::Handle *out_event_handle, ams::svc::Address message_buffer, ams::svc::Size message_buffer_size, ams::svc::Handle session_handle) {
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return SendAsyncRequestWithUserBuffer(out_event_handle, message_buffer, message_buffer_size, session_handle);
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}
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Result ReplyAndReceive64(int32_t *out_index, KUserPointer<const ams::svc::Handle *> handles, int32_t num_handles, ams::svc::Handle reply_target, int64_t timeout_ns) {
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return ReplyAndReceive(out_index, handles, num_handles, reply_target, timeout_ns);
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}
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Result ReplyAndReceiveWithUserBuffer64(int32_t *out_index, ams::svc::Address message_buffer, ams::svc::Size message_buffer_size, KUserPointer<const ams::svc::Handle *> handles, int32_t num_handles, ams::svc::Handle reply_target, int64_t timeout_ns) {
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return ReplyAndReceiveWithUserBuffer(out_index, message_buffer, message_buffer_size, handles, num_handles, reply_target, timeout_ns);
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}
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/* ============================= 64From32 ABI ============================= */
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Result SendSyncRequest64From32(ams::svc::Handle session_handle) {
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return SendSyncRequest(session_handle);
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}
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Result SendSyncRequestWithUserBuffer64From32(ams::svc::Address message_buffer, ams::svc::Size message_buffer_size, ams::svc::Handle session_handle) {
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return SendSyncRequestWithUserBuffer(message_buffer, message_buffer_size, session_handle);
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}
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Result SendAsyncRequestWithUserBuffer64From32(ams::svc::Handle *out_event_handle, ams::svc::Address message_buffer, ams::svc::Size message_buffer_size, ams::svc::Handle session_handle) {
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return SendAsyncRequestWithUserBuffer(out_event_handle, message_buffer, message_buffer_size, session_handle);
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}
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Result ReplyAndReceive64From32(int32_t *out_index, KUserPointer<const ams::svc::Handle *> handles, int32_t num_handles, ams::svc::Handle reply_target, int64_t timeout_ns) {
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return ReplyAndReceive(out_index, handles, num_handles, reply_target, timeout_ns);
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}
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Result ReplyAndReceiveWithUserBuffer64From32(int32_t *out_index, ams::svc::Address message_buffer, ams::svc::Size message_buffer_size, KUserPointer<const ams::svc::Handle *> handles, int32_t num_handles, ams::svc::Handle reply_target, int64_t timeout_ns) {
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return ReplyAndReceiveWithUserBuffer(out_index, message_buffer, message_buffer_size, handles, num_handles, reply_target, timeout_ns);
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}
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}
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