Kernel: Basic support for IPC translation for HLE services
This commit is contained in:
Yuri Kunde Schlesner
parent
7656d83df5
commit
8cb65fe65a
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@ -8,6 +8,7 @@
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#include "core/hle/kernel/handle_table.h"
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#include "core/hle/kernel/hle_ipc.h"
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#include "core/hle/kernel/kernel.h"
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#include "core/hle/kernel/process.h"
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#include "core/hle/kernel/server_session.h"
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namespace Kernel {
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@ -24,12 +25,97 @@ void SessionRequestHandler::ClientDisconnected(SharedPtr<ServerSession> server_s
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HLERequestContext::~HLERequestContext() = default;
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SharedPtr<Object> HLERequestContext::GetIncomingHandle(Handle id_from_cmdbuf) const {
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return Kernel::g_handle_table.GetGeneric(id_from_cmdbuf);
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SharedPtr<Object> HLERequestContext::GetIncomingHandle(u32 id_from_cmdbuf) const {
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ASSERT(id_from_cmdbuf < request_handles.size());
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return request_handles[id_from_cmdbuf];
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}
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Handle HLERequestContext::AddOutgoingHandle(SharedPtr<Object> object) {
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return Kernel::g_handle_table.Create(object).Unwrap();
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u32 HLERequestContext::AddOutgoingHandle(SharedPtr<Object> object) {
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request_handles.push_back(std::move(object));
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return request_handles.size() - 1;
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}
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ResultCode HLERequestContext::PopulateFromIncomingCommandBuffer(const u32_le* src_cmdbuf,
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Process& src_process,
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HandleTable& src_table) {
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IPC::Header header{src_cmdbuf[0]};
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size_t untranslated_size = 1u + header.normal_params_size;
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size_t command_size = untranslated_size + header.translate_params_size;
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ASSERT(command_size <= IPC::COMMAND_BUFFER_LENGTH); // TODO(yuriks): Return error
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std::copy_n(src_cmdbuf, untranslated_size, cmd_buf.begin());
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size_t i = untranslated_size;
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while (i < command_size) {
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u32 descriptor = cmd_buf[i] = src_cmdbuf[i];
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i += 1;
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switch (IPC::GetDescriptorType(descriptor)) {
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case IPC::DescriptorType::CopyHandle:
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case IPC::DescriptorType::MoveHandle: {
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u32 num_handles = IPC::HandleNumberFromDesc(descriptor);
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ASSERT(i + num_handles <= command_size); // TODO(yuriks): Return error
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for (u32 j = 0; j < num_handles; ++j) {
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Handle handle = src_cmdbuf[i];
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SharedPtr<Object> object = src_table.GetGeneric(handle);
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ASSERT(object != nullptr); // TODO(yuriks): Return error
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if (descriptor == IPC::DescriptorType::MoveHandle) {
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src_table.Close(handle);
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}
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cmd_buf[i++] = AddOutgoingHandle(std::move(object));
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}
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break;
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}
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case IPC::DescriptorType::CallingPid: {
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cmd_buf[i++] = src_process.process_id;
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break;
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}
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default:
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UNIMPLEMENTED_MSG("Unsupported handle translation: 0x%08X", descriptor);
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}
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}
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return RESULT_SUCCESS;
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}
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ResultCode HLERequestContext::WriteToOutgoingCommandBuffer(u32_le* dst_cmdbuf, Process& dst_process,
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HandleTable& dst_table) const {
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IPC::Header header{cmd_buf[0]};
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size_t untranslated_size = 1u + header.normal_params_size;
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size_t command_size = untranslated_size + header.translate_params_size;
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ASSERT(command_size <= IPC::COMMAND_BUFFER_LENGTH);
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std::copy_n(cmd_buf.begin(), untranslated_size, dst_cmdbuf);
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size_t i = untranslated_size;
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while (i < command_size) {
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u32 descriptor = dst_cmdbuf[i] = cmd_buf[i];
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i += 1;
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switch (IPC::GetDescriptorType(descriptor)) {
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case IPC::DescriptorType::CopyHandle:
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case IPC::DescriptorType::MoveHandle: {
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// HLE services don't use handles, so we treat both CopyHandle and MoveHandle equally
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u32 num_handles = IPC::HandleNumberFromDesc(descriptor);
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ASSERT(i + num_handles <= command_size);
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for (u32 j = 0; j < num_handles; ++j) {
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SharedPtr<Object> object = GetIncomingHandle(cmd_buf[i]);
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// TODO(yuriks): Figure out the proper error handling for if this fails
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Handle handle = dst_table.Create(object).Unwrap();
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dst_cmdbuf[i++] = handle;
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}
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break;
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}
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default:
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UNIMPLEMENTED_MSG("Unsupported handle translation: 0x%08X", descriptor);
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}
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}
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return RESULT_SUCCESS;
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}
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} // namespace Kernel
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@ -8,6 +8,7 @@
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#include <memory>
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#include <vector>
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#include "common/common_types.h"
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#include "common/swap.h"
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#include "core/hle/ipc.h"
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#include "core/hle/kernel/kernel.h"
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#include "core/hle/kernel/server_session.h"
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@ -18,6 +19,9 @@ class ServiceFrameworkBase;
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namespace Kernel {
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class HandleTable;
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class Process;
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/**
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* Interface implemented by HLE Session handlers.
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* This can be provided to a ServerSession in order to hook into several relevant events
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@ -62,6 +66,20 @@ protected:
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* Class containing information about an in-flight IPC request being handled by an HLE service
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* implementation. Services should avoid using old global APIs (e.g. Kernel::GetCommandBuffer()) and
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* when possible use the APIs in this class to service the request.
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*
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* HLE handle protocol
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* ===================
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*
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* To avoid needing HLE services to keep a separate handle table, or having to directly modify the
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* requester's table, a tweaked protocol is used to receive and send handles in requests. The kernel
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* will decode the incoming handles into object pointers and insert a id in the buffer where the
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* handle would normally be. The service then calls GetIncomingHandle() with that id to get the
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* pointer to the object. Similarly, instead of inserting a handle into the command buffer, the
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* service calls AddOutgoingHandle() and stores the returned id where the handle would normally go.
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*
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* The end result is similar to just giving services their own real handle tables, but since these
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* ids are local to a specific context, it avoids requiring services to manage handles for objects
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* across multiple calls and ensuring that unneeded handles are cleaned up.
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*/
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class HLERequestContext {
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public:
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@ -80,14 +98,29 @@ public:
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return session;
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}
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SharedPtr<Object> GetIncomingHandle(Handle id_from_cmdbuf) const;
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Handle AddOutgoingHandle(SharedPtr<Object> object);
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/**
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* Resolves a object id from the request command buffer into a pointer to an object. See the
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* "HLE handle protocol" section in the class documentation for more details.
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*/
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SharedPtr<Object> GetIncomingHandle(u32 id_from_cmdbuf) const;
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/**
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* Adds an outgoing object to the response, returning the id which should be used to reference
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* it. See the "HLE handle protocol" section in the class documentation for more details.
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*/
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u32 AddOutgoingHandle(SharedPtr<Object> object);
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private:
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friend class Service::ServiceFrameworkBase;
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ResultCode PopulateFromIncomingCommandBuffer(const u32_le* src_cmdbuf, Process& src_process,
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HandleTable& src_table);
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ResultCode WriteToOutgoingCommandBuffer(u32_le* dst_cmdbuf, Process& dst_process,
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HandleTable& dst_table) const;
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std::array<u32, IPC::COMMAND_BUFFER_LENGTH> cmd_buf;
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SharedPtr<ServerSession> session;
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std::vector<SharedPtr<Object>> request_handles;
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};
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} // namespace Kernel
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@ -9,6 +9,7 @@
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#include "common/string_util.h"
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#include "core/hle/ipc.h"
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#include "core/hle/kernel/client_port.h"
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#include "core/hle/kernel/process.h"
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#include "core/hle/kernel/server_port.h"
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#include "core/hle/kernel/server_session.h"
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#include "core/hle/service/ac/ac.h"
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@ -172,24 +173,16 @@ void ServiceFrameworkBase::HandleSyncRequest(SharedPtr<ServerSession> server_ses
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// TODO(yuriks): The kernel should be the one handling this as part of translation after
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// everything else is migrated
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IPC::Header request_header{cmd_buf[0]};
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size_t request_size =
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1 + request_header.normal_params_size + request_header.translate_params_size;
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ASSERT(request_size <= IPC::COMMAND_BUFFER_LENGTH); // TODO(yuriks): Return error
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Kernel::HLERequestContext context;
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std::copy_n(cmd_buf, request_size, context.cmd_buf.begin());
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context.session = std::move(server_session);
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context.PopulateFromIncomingCommandBuffer(cmd_buf, *Kernel::g_current_process,
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Kernel::g_handle_table);
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LOG_TRACE(Service, "%s",
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MakeFunctionString(info->name, GetServiceName().c_str(), cmd_buf).c_str());
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handler_invoker(this, info->handler_callback, context);
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IPC::Header response_header{context.cmd_buf[0]};
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size_t response_size =
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1 + response_header.normal_params_size + response_header.translate_params_size;
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ASSERT(response_size <= IPC::COMMAND_BUFFER_LENGTH);
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std::copy_n(context.cmd_buf.begin(), response_size, cmd_buf);
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context.WriteToOutgoingCommandBuffer(cmd_buf, *Kernel::g_current_process,
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Kernel::g_handle_table);
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}
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////////////////////////////////////////////////////////////////////////////////////////////////////
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