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https://github.com/Atmosphere-NX/Atmosphere.git
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kern/ipc: implement most of reply
This commit is contained in:
Michael Scire
parent
b29dc76b20
commit
1b429918de
@ -48,13 +48,31 @@ namespace ams::kern {
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}
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}
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public:
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ReceiveList(const u32 *dst_msg, const ipc::MessageBuffer::MessageHeader &dst_header, const ipc::MessageBuffer::SpecialHeader &dst_special_header, size_t msg_size, size_t out_offset, s32 dst_recv_list_idx) {
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ReceiveList(const u32 *dst_msg, uintptr_t dst_address, const KProcessPageTable &dst_page_table, const ipc::MessageBuffer::MessageHeader &dst_header, const ipc::MessageBuffer::SpecialHeader &dst_special_header, size_t msg_size, size_t out_offset, s32 dst_recv_list_idx, bool is_tls) {
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this->recv_list_count = dst_header.GetReceiveListCount();
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this->msg_buffer_end = reinterpret_cast<uintptr_t>(dst_msg) + sizeof(u32) * out_offset;
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this->msg_buffer_space_end = reinterpret_cast<uintptr_t>(dst_msg) + msg_size;
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this->msg_buffer_end = dst_address + sizeof(u32) * out_offset;
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this->msg_buffer_space_end = dst_address + msg_size;
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const u32 *recv_list = dst_msg + dst_recv_list_idx;
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__builtin_memcpy(this->data, recv_list, GetEntryCount(dst_header) * ipc::MessageBuffer::ReceiveListEntry::GetDataSize());
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const auto entry_count = GetEntryCount(dst_header);
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if (is_tls) {
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__builtin_memcpy(this->data, recv_list, entry_count * ipc::MessageBuffer::ReceiveListEntry::GetDataSize());
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} else {
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uintptr_t page_addr = util::AlignDown(dst_address, PageSize);
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uintptr_t cur_addr = dst_address + dst_recv_list_idx * sizeof(u32);
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for (size_t i = 0; i < entry_count * ipc::MessageBuffer::ReceiveListEntry::GetDataSize() / sizeof(u32); ++i) {
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if (page_addr != util::AlignDown(cur_addr, PageSize)) {
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KPhysicalAddress phys_addr;
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dst_page_table.GetPhysicalAddress(std::addressof(phys_addr), KProcessAddress(cur_addr));
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recv_list = GetPointer<u32>(KPageTable::GetHeapVirtualAddress(phys_addr));
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page_addr = util::AlignDown(cur_addr, PageSize);
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}
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this->data[i] = *(recv_list++);
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cur_addr += sizeof(u32);
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}
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}
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}
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constexpr bool IsIndex() const {
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@ -513,8 +531,8 @@ namespace ams::kern {
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R_UNLESS(dst_buffer_size >= src_end_offset * sizeof(u32), svc::ResultMessageTooLarge());
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/* Get the receive list. */
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const s32 dst_recv_list_idx = static_cast<s32>(ipc::MessageBuffer::GetReceiveListIndex(dst_header, dst_special_header));
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ReceiveList dst_recv_list(dst_msg_ptr, dst_header, dst_special_header, dst_buffer_size, src_end_offset, dst_recv_list_idx);
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const s32 dst_recv_list_idx = ipc::MessageBuffer::GetReceiveListIndex(dst_header, dst_special_header);
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ReceiveList dst_recv_list(dst_msg_ptr, dst_message_buffer, dst_page_table, dst_header, dst_special_header, dst_buffer_size, src_end_offset, dst_recv_list_idx, !dst_user);
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/* Ensure that the source special header isn't invalid. */
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const bool src_has_special_header = src_header.GetHasSpecialHeader();
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@ -631,10 +649,186 @@ namespace ams::kern {
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return ResultSuccess();
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}
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ALWAYS_INLINE Result SendMessage(uintptr_t src_message_buffer, size_t src_buffer_size, KPhysicalAddress src_message_paddr, KThread &dst_thread, uintptr_t dst_message_buffer, size_t dst_buffer_size, KServerSession *session, KSessionRequest *request) {
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ALWAYS_INLINE Result ProcessSendMessageReceiveMapping(KProcessPageTable &dst_page_table, KProcessAddress client_address, KProcessAddress server_address, size_t size, KMemoryState src_state) {
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MESOSPHERE_UNIMPLEMENTED();
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}
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ALWAYS_INLINE Result ProcessSendMessagePointerDescriptors(int &offset, int &pointer_key, KProcessPageTable &dst_page_table, KProcessPageTable &src_page_table, const ipc::MessageBuffer &dst_msg, const ipc::MessageBuffer &src_msg, const ReceiveList &dst_recv_list, bool dst_user) {
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MESOSPHERE_UNIMPLEMENTED();
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}
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ALWAYS_INLINE Result SendMessage(uintptr_t src_message_buffer, size_t src_buffer_size, KPhysicalAddress src_message_paddr, KThread &dst_thread, uintptr_t dst_message_buffer, size_t dst_buffer_size, KServerSession *session, KSessionRequest *request) {
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/* Prepare variables for send. */
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KThread &src_thread = GetCurrentThread();
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KProcess &dst_process = *(dst_thread.GetOwnerProcess());
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KProcess &src_process = *(src_thread.GetOwnerProcess());
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auto &dst_page_table = dst_process.GetPageTable();
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auto &src_page_table = src_process.GetPageTable();
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/* Determine the message buffers. */
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u32 *dst_msg_ptr, *src_msg_ptr;
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bool dst_user, src_user;
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if (dst_message_buffer) {
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/* NOTE: Nintendo does not check the result of this GetPhysicalAddress call. */
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KPhysicalAddress dst_message_paddr;
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dst_page_table.GetPhysicalAddress(std::addressof(dst_message_paddr), dst_message_buffer);
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dst_msg_ptr = GetPointer<u32>(KPageTable::GetHeapVirtualAddress(dst_message_paddr));
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dst_user = true;
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} else {
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dst_msg_ptr = static_cast<ams::svc::ThreadLocalRegion *>(dst_thread.GetThreadLocalRegionHeapAddress())->message_buffer;
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dst_buffer_size = sizeof(ams::svc::ThreadLocalRegion{}.message_buffer);
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dst_message_buffer = GetInteger(dst_thread.GetThreadLocalRegionAddress());
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dst_user = false;
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}
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if (src_message_buffer) {
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src_msg_ptr = GetPointer<u32>(KPageTable::GetHeapVirtualAddress(src_message_paddr));
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src_user = true;
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} else {
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src_msg_ptr = static_cast<ams::svc::ThreadLocalRegion *>(src_thread.GetThreadLocalRegionHeapAddress())->message_buffer;
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src_buffer_size = sizeof(ams::svc::ThreadLocalRegion{}.message_buffer);
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src_message_buffer = GetInteger(src_thread.GetThreadLocalRegionAddress());
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src_user = false;
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}
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/* Parse the headers. */
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const ipc::MessageBuffer dst_msg(dst_msg_ptr, dst_buffer_size);
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const ipc::MessageBuffer src_msg(src_msg_ptr, src_buffer_size);
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const ipc::MessageBuffer::MessageHeader dst_header(dst_msg);
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const ipc::MessageBuffer::MessageHeader src_header(src_msg);
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const ipc::MessageBuffer::SpecialHeader dst_special_header(dst_msg, dst_header);
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const ipc::MessageBuffer::SpecialHeader src_special_header(src_msg, src_header);
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/* Get the end of the source message. */
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const size_t src_end_offset = ipc::MessageBuffer::GetRawDataIndex(src_header, src_special_header) + src_header.GetRawCount();
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/* Declare variables for processing. */
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int offset = 0;
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int pointer_key = 0;
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bool processed_special_data = false;
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/* Set up a guard to make sure that we end up in a clean state on error. */
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auto cleanup_guard = SCOPE_GUARD {
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/* Cleanup special data. */
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if (processed_special_data) {
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if (src_header.GetHasSpecialHeader()) {
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CleanupSpecialData(dst_process, dst_msg_ptr, dst_buffer_size);
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}
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} else {
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CleanupServerHandles(src_message_buffer, src_buffer_size, src_message_paddr);
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}
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/* Cleanup mappings. */
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CleanupMap(request, std::addressof(src_process), std::addressof(dst_page_table));
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};
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/* Ensure that the headers fit. */
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R_UNLESS(ipc::MessageBuffer::GetMessageBufferSize(src_header, src_special_header) <= src_buffer_size, svc::ResultInvalidCombination());
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R_UNLESS(ipc::MessageBuffer::GetMessageBufferSize(dst_header, dst_special_header) <= dst_buffer_size, svc::ResultInvalidCombination());
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/* Ensure the receive list offset is after the end of raw data. */
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if (dst_header.GetReceiveListOffset()) {
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R_UNLESS(dst_header.GetReceiveListOffset() >= ipc::MessageBuffer::GetRawDataIndex(dst_header, dst_special_header) + dst_header.GetRawCount(), svc::ResultInvalidCombination());
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}
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/* Ensure that the destination buffer is big enough to receive the source. */
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R_UNLESS(dst_buffer_size >= src_end_offset * sizeof(u32), svc::ResultMessageTooLarge());
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/* Replies must have no buffers. */
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R_UNLESS(src_header.GetSendCount() == 0, svc::ResultInvalidCombination());
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R_UNLESS(src_header.GetReceiveCount() == 0, svc::ResultInvalidCombination());
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R_UNLESS(src_header.GetExchangeCount() == 0, svc::ResultInvalidCombination());
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/* Get the receive list. */
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const s32 dst_recv_list_idx = ipc::MessageBuffer::GetReceiveListIndex(dst_header, dst_special_header);
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ReceiveList dst_recv_list(dst_msg_ptr, dst_message_buffer, dst_page_table, dst_header, dst_special_header, dst_buffer_size, src_end_offset, dst_recv_list_idx, !dst_user);
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/* Handle any receive buffers. */
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for (size_t i = 0; i < request->GetReceiveCount(); ++i) {
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R_TRY(ProcessSendMessageReceiveMapping(dst_page_table, request->GetReceiveClientAddress(i), request->GetReceiveServerAddress(i), request->GetReceiveSize(i), request->GetReceiveMemoryState(i)));
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}
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/* Handle any exchange buffers. */
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for (size_t i = 0; i < request->GetReceiveCount(); ++i) {
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R_TRY(ProcessSendMessageReceiveMapping(dst_page_table, request->GetExchangeClientAddress(i), request->GetExchangeServerAddress(i), request->GetExchangeSize(i), request->GetExchangeMemoryState(i)));
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}
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/* Set the header. */
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offset = dst_msg.Set(src_header);
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/* Process any special data. */
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MESOSPHERE_ASSERT(GetCurrentThreadPointer() == std::addressof(src_thread));
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processed_special_data = true;
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if (src_header.GetHasSpecialHeader()) {
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R_TRY(ProcessMessageSpecialData<true>(offset, dst_process, src_process, src_thread, dst_msg, src_msg, src_special_header));
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}
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/* Process any pointer buffers. */
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for (auto i = 0; i < src_header.GetPointerCount(); ++i) {
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R_TRY(ProcessSendMessagePointerDescriptors(offset, pointer_key, dst_page_table, src_page_table, dst_msg, src_msg, dst_recv_list, dst_user && dst_header.GetReceiveListCount() == ipc::MessageBuffer::MessageHeader::ReceiveListCountType_ToMessageBuffer));
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}
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/* Clear any map alias buffers. */
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for (auto i = 0; i < src_header.GetMapAliasCount(); ++i) {
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offset = dst_msg.Set(offset, ipc::MessageBuffer::MapAliasDescriptor());
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}
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/* Process any raw data. */
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if (const auto raw_count = src_header.GetRawCount(); raw_count != 0) {
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/* Get the offset and size. */
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const size_t offset_words = offset * sizeof(u32);
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const size_t raw_size = raw_count * sizeof(u32);
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/* Fast case is TLS -> TLS, do raw memcpy if we can. */
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if (!dst_user && !src_user) {
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std::memcpy(dst_msg_ptr + offset, src_msg_ptr + offset, raw_size);
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} else if (src_user) {
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/* Determine how much fast size we can copy. */
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const size_t max_fast_size = std::min<size_t>(offset_words + raw_size, PageSize);
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const size_t fast_size = max_fast_size - offset_words;
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/* Determine the dst permission. User buffer should be unmapped + read, TLS should be user readable. */
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const KMemoryPermission dst_perm = static_cast<KMemoryPermission>(dst_user ? KMemoryPermission_NotMapped | KMemoryPermission_KernelReadWrite : KMemoryPermission_UserReadWrite);
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/* Perform the fast part of the copy. */
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R_TRY(dst_page_table.CopyMemoryFromKernelToLinear(dst_message_buffer + offset_words, fast_size,
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KMemoryState_FlagReferenceCounted, KMemoryState_FlagReferenceCounted,
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dst_perm,
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KMemoryAttribute_Uncached, KMemoryAttribute_None,
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reinterpret_cast<uintptr_t>(src_msg_ptr) + offset_words));
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/* If the fast part of the copy didn't get everything, perform the slow part of the copy. */
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if (fast_size < raw_size) {
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R_TRY(src_page_table.CopyMemoryFromLinearToLinear(dst_page_table, dst_message_buffer + max_fast_size, raw_size - fast_size,
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KMemoryState_FlagReferenceCounted, KMemoryState_FlagReferenceCounted,
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dst_perm,
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KMemoryAttribute_Uncached, KMemoryAttribute_None,
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src_message_buffer + max_fast_size,
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KMemoryState_FlagReferenceCounted, KMemoryState_FlagReferenceCounted,
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static_cast<KMemoryPermission>(KMemoryPermission_NotMapped | KMemoryPermission_KernelRead),
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KMemoryAttribute_AnyLocked | KMemoryAttribute_Uncached | KMemoryAttribute_Locked, KMemoryAttribute_AnyLocked | KMemoryAttribute_Locked));
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}
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} else /* if (dst_user) */ {
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/* The destination is a user buffer, so it should be unmapped + readable. */
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constexpr KMemoryPermission DestinationPermission = static_cast<KMemoryPermission>(KMemoryPermission_NotMapped | KMemoryPermission_KernelReadWrite);
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/* Copy the memory. */
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R_TRY(src_page_table.CopyMemoryFromUserToLinear(dst_message_buffer + offset_words, raw_size,
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KMemoryState_FlagReferenceCounted, KMemoryState_FlagReferenceCounted,
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DestinationPermission,
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KMemoryAttribute_Uncached, KMemoryAttribute_None,
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src_message_buffer + offset_words));
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}
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}
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/* We succeeded. Perform cleanup with validation. */
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cleanup_guard.Cancel();
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return CleanupMap(request, std::addressof(src_process), std::addressof(dst_page_table));
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}
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ALWAYS_INLINE void ReplyAsyncError(KProcess *to_process, uintptr_t to_msg_buf, size_t to_msg_buf_size, Result result) {
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/* Convert the buffer to a physical address. */
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KPhysicalAddress phys_addr;
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