Atmosphere/libraries/libmesosphere/source/svc/kern_svc_ipc.cpp

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/*
* Copyright (c) 2018-2020 Atmosphère-NX
*
* This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU General Public License,
* version 2, as published by the Free Software Foundation.
*
* This program is distributed in the hope it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <mesosphere.hpp>
namespace ams::kern::svc {
#pragma GCC push_options
#pragma GCC optimize ("-O2")
/* ============================= Common ============================= */
namespace {
ALWAYS_INLINE Result SendSyncRequestImpl(uintptr_t message, size_t buffer_size, ams::svc::Handle session_handle) {
/* Get the client session. */
KScopedAutoObject session = GetCurrentProcess().GetHandleTable().GetObject<KClientSession>(session_handle);
R_UNLESS(session.IsNotNull(), svc::ResultInvalidHandle());
/* Get the parent, and persist a reference to it until we're done. */
KScopedAutoObject parent = session->GetParent();
MESOSPHERE_ASSERT(parent.IsNotNull());
/* Send the request. */
return session->SendSyncRequest(message, buffer_size);
}
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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) {
/* Reply to the target, if one is specified. */
if (reply_target != ams::svc::InvalidHandle) {
KScopedAutoObject session = GetCurrentProcess().GetHandleTable().GetObject<KServerSession>(reply_target);
R_UNLESS(session.IsNotNull(), svc::ResultInvalidHandle());
/* If we fail to reply, we want to set the output index to -1. */
auto reply_idx_guard = SCOPE_GUARD { *out_index = -1; };
/* Send the reply. */
R_TRY(session->SendReply(message, buffer_size, message_paddr));
/* Cancel our guard. */
reply_idx_guard.Cancel();
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}
/* Receive a message. */
{
/* Convert the timeout from nanoseconds to ticks. */
/* NOTE: Nintendo does not use this conversion logic in WaitSynchronization... */
s64 timeout;
if (timeout_ns > 0) {
const ams::svc::Tick offset_tick(TimeSpan::FromNanoSeconds(timeout_ns));
if (AMS_LIKELY(offset_tick > 0)) {
timeout = KHardwareTimer::GetTick() + offset_tick + 2;
if (AMS_UNLIKELY(timeout <= 0)) {
timeout = std::numeric_limits<s64>::max();
}
} else {
timeout = std::numeric_limits<s64>::max();
}
} else {
timeout = timeout_ns;
}
/* Wait for a message. */
while (true) {
s32 index;
Result result = KSynchronizationObject::Wait(std::addressof(index), objs, num_objects, timeout);
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if (svc::ResultTimedOut::Includes(result)) {
return result;
}
if (R_SUCCEEDED(result)) {
KServerSession *session = objs[index]->DynamicCast<KServerSession *>();
if (session != nullptr) {
result = session->ReceiveRequest(message, buffer_size, message_paddr);
if (svc::ResultNotFound::Includes(result)) {
continue;
}
}
}
*out_index = index;
return result;
}
}
}
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) {
/* Ensure number of handles is valid. */
R_UNLESS(0 <= num_handles && num_handles <= ams::svc::ArgumentHandleCountMax, svc::ResultOutOfRange());
/* Get the synchronization context. */
auto &handle_table = GetCurrentProcess().GetHandleTable();
KSynchronizationObject **objs = GetCurrentThread().GetSynchronizationObjectBuffer();
ams::svc::Handle *handles = GetCurrentThread().GetHandleBuffer();
/* Copy user handles. */
if (num_handles > 0) {
/* Ensure that we can try to get the handles. */
R_UNLESS(GetCurrentProcess().GetPageTable().Contains(KProcessAddress(user_handles.GetUnsafePointer()), num_handles * sizeof(ams::svc::Handle)), svc::ResultInvalidPointer());
/* Get the handles. */
R_TRY(user_handles.CopyArrayTo(handles, num_handles));
/* Convert the handles to objects. */
R_UNLESS(handle_table.GetMultipleObjects<KSynchronizationObject>(objs, handles, num_handles), svc::ResultInvalidHandle());
}
/* Ensure handles are closed when we're done. */
ON_SCOPE_EXIT {
for (auto i = 0; i < num_handles; ++i) {
objs[i]->Close();
}
};
return ReplyAndReceiveImpl(out_index, message, buffer_size, message_paddr, objs, num_handles, reply_target, timeout_ns);
}
ALWAYS_INLINE Result SendSyncRequest(ams::svc::Handle session_handle) {
return SendSyncRequestImpl(0, 0, session_handle);
}
ALWAYS_INLINE Result SendSyncRequestWithUserBuffer(uintptr_t message, size_t buffer_size, ams::svc::Handle session_handle) {
/* Validate that the message buffer is page aligned and does not overflow. */
R_UNLESS(util::IsAligned(message, PageSize), svc::ResultInvalidAddress());
R_UNLESS(buffer_size > 0, svc::ResultInvalidSize());
R_UNLESS(util::IsAligned(buffer_size, PageSize), svc::ResultInvalidSize());
R_UNLESS(message < message + buffer_size, svc::ResultInvalidCurrentMemory());
/* Get the process page table. */
auto &page_table = GetCurrentProcess().GetPageTable();
/* Lock the mesage buffer. */
R_TRY(page_table.LockForIpcUserBuffer(nullptr, message, buffer_size));
/* Ensure that even if we fail, we unlock the message buffer when done. */
auto unlock_guard = SCOPE_GUARD { page_table.UnlockForIpcUserBuffer(message, buffer_size); };
/* Send the request. */
MESOSPHERE_ASSERT(message != 0);
R_TRY(SendSyncRequestImpl(message, buffer_size, session_handle));
/* We sent the request successfully, so cancel our guard and check the unlock result. */
unlock_guard.Cancel();
return page_table.UnlockForIpcUserBuffer(message, buffer_size);
}
ALWAYS_INLINE Result SendAsyncRequestWithUserBufferImpl(ams::svc::Handle *out_event_handle, uintptr_t message, size_t buffer_size, ams::svc::Handle session_handle) {
/* Get the process and handle table. */
auto &process = GetCurrentProcess();
auto &handle_table = process.GetHandleTable();
/* Reserve a new event from the process resource limit. */
KScopedResourceReservation event_reservation(std::addressof(process), ams::svc::LimitableResource_EventCountMax);
R_UNLESS(event_reservation.Succeeded(), svc::ResultLimitReached());
/* Get the client session. */
KScopedAutoObject session = GetCurrentProcess().GetHandleTable().GetObject<KClientSession>(session_handle);
R_UNLESS(session.IsNotNull(), svc::ResultInvalidHandle());
/* Get the parent, and persist a reference to it until we're done. */
KScopedAutoObject parent = session->GetParent();
MESOSPHERE_ASSERT(parent.IsNotNull());
/* Create a new event. */
KEvent *event = KEvent::Create();
R_UNLESS(event != nullptr, svc::ResultOutOfResource());
/* Initialize the event. */
event->Initialize();
/* Commit our reservation. */
event_reservation.Commit();
/* At end of scope, kill the standing references to the sub events. */
ON_SCOPE_EXIT {
event->GetReadableEvent().Close();
event->GetWritableEvent().Close();
};
/* Register the event. */
KEvent::Register(event);
/* Add the readable event to the handle table. */
R_TRY(handle_table.Add(out_event_handle, std::addressof(event->GetReadableEvent())));
/* Ensure that if we fail to send the request, we close the readable handle. */
auto read_guard = SCOPE_GUARD { handle_table.Remove(*out_event_handle); };
/* Send the async request. */
R_TRY(session->SendAsyncRequest(std::addressof(event->GetWritableEvent()), message, buffer_size));
/* We succeeded. */
read_guard.Cancel();
return ResultSuccess();
}
ALWAYS_INLINE Result SendAsyncRequestWithUserBuffer(ams::svc::Handle *out_event_handle, uintptr_t message, size_t buffer_size, ams::svc::Handle session_handle) {
/* Validate that the message buffer is page aligned and does not overflow. */
R_UNLESS(util::IsAligned(message, PageSize), svc::ResultInvalidAddress());
R_UNLESS(buffer_size > 0, svc::ResultInvalidSize());
R_UNLESS(util::IsAligned(buffer_size, PageSize), svc::ResultInvalidSize());
R_UNLESS(message < message + buffer_size, svc::ResultInvalidCurrentMemory());
/* Get the process page table. */
auto &page_table = GetCurrentProcess().GetPageTable();
/* Lock the mesage buffer. */
R_TRY(page_table.LockForIpcUserBuffer(nullptr, message, buffer_size));
/* Ensure that if we fail, we unlock the message buffer. */
auto unlock_guard = SCOPE_GUARD { page_table.UnlockForIpcUserBuffer(message, buffer_size); };
/* Send the request. */
MESOSPHERE_ASSERT(message != 0);
R_TRY(SendAsyncRequestWithUserBufferImpl(out_event_handle, message, buffer_size, session_handle));
/* We sent the request successfully. */
unlock_guard.Cancel();
return ResultSuccess();
}
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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) {
return ReplyAndReceiveImpl(out_index, 0, 0, Null<KPhysicalAddress>, handles, num_handles, reply_target, timeout_ns);
}
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) {
/* Validate that the message buffer is page aligned and does not overflow. */
R_UNLESS(util::IsAligned(message, PageSize), svc::ResultInvalidAddress());
R_UNLESS(buffer_size > 0, svc::ResultInvalidSize());
R_UNLESS(util::IsAligned(buffer_size, PageSize), svc::ResultInvalidSize());
R_UNLESS(message < message + buffer_size, svc::ResultInvalidCurrentMemory());
/* Get the process page table. */
auto &page_table = GetCurrentProcess().GetPageTable();
/* Lock the mesage buffer, getting its physical address. */
KPhysicalAddress message_paddr;
R_TRY(page_table.LockForIpcUserBuffer(std::addressof(message_paddr), message, buffer_size));
/* Ensure that even if we fail, we unlock the message buffer when done. */
auto unlock_guard = SCOPE_GUARD { page_table.UnlockForIpcUserBuffer(message, buffer_size); };
/* Send the request. */
MESOSPHERE_ASSERT(message != 0);
R_TRY(ReplyAndReceiveImpl(out_index, message, buffer_size, message_paddr, handles, num_handles, reply_target, timeout_ns));
/* We sent the request successfully, so cancel our guard and check the unlock result. */
unlock_guard.Cancel();
return page_table.UnlockForIpcUserBuffer(message, buffer_size);
}
}
/* ============================= 64 ABI ============================= */
Result SendSyncRequest64(ams::svc::Handle session_handle) {
return SendSyncRequest(session_handle);
}
Result SendSyncRequestWithUserBuffer64(ams::svc::Address message_buffer, ams::svc::Size message_buffer_size, ams::svc::Handle session_handle) {
return SendSyncRequestWithUserBuffer(message_buffer, message_buffer_size, session_handle);
}
Result SendAsyncRequestWithUserBuffer64(ams::svc::Handle *out_event_handle, ams::svc::Address message_buffer, ams::svc::Size message_buffer_size, ams::svc::Handle session_handle) {
return SendAsyncRequestWithUserBuffer(out_event_handle, message_buffer, message_buffer_size, session_handle);
}
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);
}
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) {
return ReplyAndReceiveWithUserBuffer(out_index, message_buffer, message_buffer_size, handles, num_handles, reply_target, timeout_ns);
}
/* ============================= 64From32 ABI ============================= */
Result SendSyncRequest64From32(ams::svc::Handle session_handle) {
return SendSyncRequest(session_handle);
}
Result SendSyncRequestWithUserBuffer64From32(ams::svc::Address message_buffer, ams::svc::Size message_buffer_size, ams::svc::Handle session_handle) {
return SendSyncRequestWithUserBuffer(message_buffer, message_buffer_size, session_handle);
}
Result SendAsyncRequestWithUserBuffer64From32(ams::svc::Handle *out_event_handle, ams::svc::Address message_buffer, ams::svc::Size message_buffer_size, ams::svc::Handle session_handle) {
return SendAsyncRequestWithUserBuffer(out_event_handle, message_buffer, message_buffer_size, session_handle);
}
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);
}
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) {
return ReplyAndReceiveWithUserBuffer(out_index, message_buffer, message_buffer_size, handles, num_handles, reply_target, timeout_ns);
}
#pragma GCC pop_options
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}