mirror of
https://github.com/Atmosphere-NX/Atmosphere.git
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161 lines
6.9 KiB
C++
161 lines
6.9 KiB
C++
/*
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* Copyright (c) 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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template<typename T>
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Result CreateSession(ams::svc::Handle *out_server, ams::svc::Handle *out_client, uintptr_t name) {
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/* Get the current process and handle table. */
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auto &process = GetCurrentProcess();
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auto &handle_table = process.GetHandleTable();
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/* Declare the session we're going to allocate. */
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T *session;
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/* Reserve a new session from the process resource limit. */
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KScopedResourceReservation session_reservation(std::addressof(process), ams::svc::LimitableResource_SessionCountMax);
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if (session_reservation.Succeeded()) {
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/* Allocate a session normally. */
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session = T::Create();
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} else {
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/* We couldn't reserve a session. Check that we support dynamically expanding the resource limit. */
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R_UNLESS(process.GetResourceLimit() == std::addressof(Kernel::GetSystemResourceLimit()), svc::ResultLimitReached());
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R_UNLESS(KTargetSystem::IsDynamicResourceLimitsEnabled(), svc::ResultLimitReached());
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/* Try to allocate a session from unused slab memory. */
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session = T::CreateFromUnusedSlabMemory();
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R_UNLESS(session != nullptr, svc::ResultLimitReached());
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/* If we're creating a KSession, we want to add two KSessionRequests to the heap, to prevent request exhaustion. */
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/* NOTE: Nintendo checks if session->DynamicCast<KSession *>() != nullptr, but there's no reason to not do this statically. */
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if constexpr (std::same_as<T, KSession>) {
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/* Ensure that if we fail to allocate our session requests, we close the session we created. */
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auto session_guard = SCOPE_GUARD { session->Close(); };
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{
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for (size_t i = 0; i < 2; ++i) {
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KSessionRequest *request = KSessionRequest::CreateFromUnusedSlabMemory();
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R_UNLESS(request != nullptr, svc::ResultLimitReached());
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request->Close();
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}
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}
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session_guard.Cancel();
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}
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/* We successfully allocated a session, so add the object we allocated to the resource limit. */
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Kernel::GetSystemResourceLimit().Add(ams::svc::LimitableResource_SessionCountMax, 1);
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}
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/* Check that we successfully created a session. */
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R_UNLESS(session != nullptr, svc::ResultOutOfResource());
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/* Initialize the session. */
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session->Initialize(nullptr, name);
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/* Commit the session reservation. */
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session_reservation.Commit();
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/* Ensure that we clean up the session (and its only references are handle table) on function end. */
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ON_SCOPE_EXIT {
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session->GetClientSession().Close();
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session->GetServerSession().Close();
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};
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/* Register the session. */
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T::Register(session);
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/* Add the server session to the handle table. */
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R_TRY(handle_table.Add(out_server, std::addressof(session->GetServerSession())));
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/* Ensure that we maintaing a clean handle state on exit. */
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auto handle_guard = SCOPE_GUARD { handle_table.Remove(*out_server); };
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/* Add the client session to the handle table. */
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R_TRY(handle_table.Add(out_client, std::addressof(session->GetClientSession())));
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/* We succeeded! */
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handle_guard.Cancel();
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return ResultSuccess();
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}
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Result CreateSession(ams::svc::Handle *out_server, ams::svc::Handle *out_client, bool is_light, uintptr_t name) {
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if (is_light) {
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return CreateSession<KLightSession>(out_server, out_client, name);
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} else {
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return CreateSession<KSession>(out_server, out_client, name);
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}
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}
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Result AcceptSession(ams::svc::Handle *out, ams::svc::Handle port_handle) {
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/* Get the current handle table. */
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auto &handle_table = GetCurrentProcess().GetHandleTable();
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/* Get the server port. */
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KScopedAutoObject port = handle_table.GetObject<KServerPort>(port_handle);
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R_UNLESS(port.IsNotNull(), svc::ResultInvalidHandle());
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/* Reserve an entry for the new session. */
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R_TRY(handle_table.Reserve(out));
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auto handle_guard = SCOPE_GUARD { handle_table.Unreserve(*out); };
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/* Accept the session. */
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KAutoObject *session;
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if (port->IsLight()) {
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session = port->AcceptLightSession();
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} else {
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session = port->AcceptSession();
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}
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/* Ensure we accepted successfully. */
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R_UNLESS(session != nullptr, svc::ResultNotFound());
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/* Register the session. */
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handle_table.Register(*out, session);
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handle_guard.Cancel();
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session->Close();
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return ResultSuccess();
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}
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}
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/* ============================= 64 ABI ============================= */
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Result CreateSession64(ams::svc::Handle *out_server_session_handle, ams::svc::Handle *out_client_session_handle, bool is_light, ams::svc::Address name) {
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return CreateSession(out_server_session_handle, out_client_session_handle, is_light, name);
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}
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Result AcceptSession64(ams::svc::Handle *out_handle, ams::svc::Handle port) {
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return AcceptSession(out_handle, port);
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}
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/* ============================= 64From32 ABI ============================= */
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Result CreateSession64From32(ams::svc::Handle *out_server_session_handle, ams::svc::Handle *out_client_session_handle, bool is_light, ams::svc::Address name) {
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return CreateSession(out_server_session_handle, out_client_session_handle, is_light, name);
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}
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Result AcceptSession64From32(ams::svc::Handle *out_handle, ams::svc::Handle port) {
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return AcceptSession(out_handle, port);
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}
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}
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