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Merge pull request #2981 from Subv/replyreceive 

Kernel/SVC: Implement LLE command buffer translation in ReplyAndReceive
This commit is contained in:
Sebastian Valle 2017-11-06 13:02:30 -05:00 committed by GitHub
parent bd5fe0c48f 23deae4785
commit d55a13c35d
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GPG Key ID: 4AEE18F83AFDEB23
10 changed files with 173 additions and 33 deletions
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5
src/citra_qt/debugger/wait_tree.cpp
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@ -154,6 +154,9 @@ QString WaitTreeThread::GetText() const {
case THREADSTATUS_WAIT_SLEEP:
status = tr("sleeping");
break;
case THREADSTATUS_WAIT_IPC:
status = tr("waiting for IPC response");
break;
case THREADSTATUS_WAIT_SYNCH_ALL:
case THREADSTATUS_WAIT_SYNCH_ANY:
status = tr("waiting for objects");
@ -182,6 +185,8 @@ QColor WaitTreeThread::GetColor() const {
return QColor(Qt::GlobalColor::darkRed);
case THREADSTATUS_WAIT_SLEEP:
return QColor(Qt::GlobalColor::darkYellow);
case THREADSTATUS_WAIT_IPC:
return QColor(Qt::GlobalColor::darkCyan);
case THREADSTATUS_WAIT_SYNCH_ALL:
case THREADSTATUS_WAIT_SYNCH_ANY:
return QColor(Qt::GlobalColor::red);

2
src/core/CMakeLists.txt
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@ -62,6 +62,7 @@ set(SRCS
hle/kernel/timer.cpp
hle/kernel/vm_manager.cpp
hle/kernel/wait_object.cpp
hle/kernel/ipc.cpp
hle/lock.cpp
hle/romfs.cpp
hle/service/ac/ac.cpp
@ -248,6 +249,7 @@ set(HEADERS
hle/kernel/event.h
hle/kernel/handle_table.h
hle/kernel/hle_ipc.h
hle/kernel/ipc.h
hle/kernel/kernel.h
hle/kernel/memory.h
hle/kernel/mutex.h

2
src/core/hle/kernel/errors.h
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@ -7,7 +7,6 @@
#include "core/hle/result.h"
namespace Kernel {
namespace ErrCodes {
enum {
OutOfHandles = 19,
@ -18,6 +17,7 @@ enum {
WrongPermission = 46,
InvalidBufferDescriptor = 48,
MaxConnectionsReached = 52,
CommandTooLarge = 54,
};
}

93
src/core/hle/kernel/ipc.cpp Normal file
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@ -0,0 +1,93 @@
// Copyright 2017 Citra Emulator Project
// Licensed under GPLv2 or any later version
// Refer to the license.txt file included.
#include "core/hle/ipc.h"
#include "core/hle/kernel/handle_table.h"
#include "core/hle/kernel/ipc.h"
#include "core/hle/kernel/kernel.h"
#include "core/hle/kernel/memory.h"
#include "core/hle/kernel/process.h"
#include "core/hle/kernel/thread.h"
#include "core/memory.h"
namespace Kernel {
ResultCode TranslateCommandBuffer(SharedPtr<Thread> src_thread, SharedPtr<Thread> dst_thread,
VAddr src_address, VAddr dst_address) {
auto& src_process = src_thread->owner_process;
IPC::Header header;
// TODO(Subv): Replace by Memory::Read32 when possible.
Memory::ReadBlock(*src_process, src_address, &header.raw, sizeof(header.raw));
size_t untranslated_size = 1u + header.normal_params_size;
size_t command_size = untranslated_size + header.translate_params_size;
// Note: The real kernel does not check that the command length fits into the IPC buffer area.
ASSERT(command_size <= IPC::COMMAND_BUFFER_LENGTH);
std::array<u32, IPC::COMMAND_BUFFER_LENGTH> cmd_buf;
Memory::ReadBlock(*src_process, src_address, cmd_buf.data(), command_size * sizeof(u32));
size_t i = untranslated_size;
while (i < command_size) {
u32 descriptor = cmd_buf[i];
i += 1;
switch (IPC::GetDescriptorType(descriptor)) {
case IPC::DescriptorType::CopyHandle:
case IPC::DescriptorType::MoveHandle: {
u32 num_handles = IPC::HandleNumberFromDesc(descriptor);
// Note: The real kernel does not check that the number of handles fits into the command
// buffer before writing them, only after finishing.
if (i + num_handles > command_size) {
return ResultCode(ErrCodes::CommandTooLarge, ErrorModule::OS,
ErrorSummary::InvalidState, ErrorLevel::Status);
}
for (u32 j = 0; j < num_handles; ++j) {
Handle handle = cmd_buf[i];
SharedPtr<Object> object = nullptr;
// Perform pseudo-handle detection here because by the time this function is called,
// the current thread and process are no longer the ones which created this IPC
// request, but the ones that are handling it.
if (handle == CurrentThread) {
object = src_thread;
} else if (handle == CurrentProcess) {
object = src_process;
} else if (handle != 0) {
object = g_handle_table.GetGeneric(handle);
if (descriptor == IPC::DescriptorType::MoveHandle) {
g_handle_table.Close(handle);
}
}
if (object == nullptr) {
// Note: The real kernel sets invalid translated handles to 0 in the target
// command buffer.
cmd_buf[i++] = 0;
continue;
}
auto result = g_handle_table.Create(std::move(object));
cmd_buf[i++] = result.ValueOr(0);
}
break;
}
case IPC::DescriptorType::CallingPid: {
cmd_buf[i++] = src_process->process_id;
break;
}
default:
UNIMPLEMENTED_MSG("Unsupported handle translation: 0x%08X", descriptor);
}
}
Memory::WriteBlock(*dst_thread->owner_process, dst_address, cmd_buf.data(),
command_size * sizeof(u32));
return RESULT_SUCCESS;
}
} // namespace Kernel

14
src/core/hle/kernel/ipc.h Normal file
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@ -0,0 +1,14 @@
// Copyright 2017 Citra Emulator Project
// Licensed under GPLv2 or any later version
// Refer to the license.txt file included.
#pragma once
#include "common/common_types.h"
#include "core/hle/kernel/thread.h"
namespace Kernel {
/// Performs IPC command buffer translation from one process to another.
ResultCode TranslateCommandBuffer(SharedPtr<Thread> src_thread, SharedPtr<Thread> dst_thread,
VAddr src_address, VAddr dst_address);
} // namespace Kernel

12
src/core/hle/kernel/server_session.cpp
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@ -61,13 +61,11 @@ ResultCode ServerSession::HandleSyncRequest(SharedPtr<Thread> thread) {
// If this ServerSession has an associated HLE handler, forward the request to it.
if (hle_handler != nullptr) {
// Attempt to translate the incoming request's command buffer.
ResultCode result = TranslateHLERequest(this);
if (result.IsError())
return result;
hle_handler->HandleSyncRequest(SharedPtr<ServerSession>(this));
// TODO(Subv): Translate the response command buffer.
} else {
// Put the thread to sleep until the server replies, it will be awoken in
// svcReplyAndReceive.
thread->status = THREADSTATUS_WAIT_IPC;
// Add the thread to the list of threads that have issued a sync request with this
// server.
pending_requesting_threads.push_back(std::move(thread));
@ -96,8 +94,4 @@ ServerSession::SessionPair ServerSession::CreateSessionPair(const std::string& n
return std::make_tuple(std::move(server_session), std::move(client_session));
}
ResultCode TranslateHLERequest(ServerSession* server_session) {
// TODO(Subv): Implement this function once multiple concurrent processes are supported.
return RESULT_SUCCESS;
}
} // namespace Kernel

14
src/core/hle/kernel/server_session.h
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@ -36,6 +36,9 @@ class Thread;
*/
class ServerSession final : public WaitObject {
public:
std::string GetName() const override {
return name;
}
std::string GetTypeName() const override {
return "ServerSession";
}
@ -104,13 +107,4 @@ private:
static ResultVal<SharedPtr<ServerSession>> Create(std::string name = "Unknown");
};
/**
* Performs command buffer translation for an HLE IPC request.
* The command buffer from the ServerSession thread's TLS is copied into a
* buffer and all descriptors in the buffer are processed.
* TODO(Subv): Implement this function, currently we do not support multiple processes running at
* once, but once that is implemented we'll need to properly translate all descriptors
* in the command buffer.
*/
ResultCode TranslateHLERequest(ServerSession* server_session);
}
} // namespace Kernel

1
src/core/hle/kernel/thread.cpp
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@ -278,6 +278,7 @@ void Thread::ResumeFromWait() {
case THREADSTATUS_WAIT_SYNCH_ANY:
case THREADSTATUS_WAIT_ARB:
case THREADSTATUS_WAIT_SLEEP:
case THREADSTATUS_WAIT_IPC:
break;
case THREADSTATUS_READY:

1
src/core/hle/kernel/thread.h
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@ -35,6 +35,7 @@ enum ThreadStatus {
THREADSTATUS_READY, ///< Ready to run
THREADSTATUS_WAIT_ARB, ///< Waiting on an address arbiter
THREADSTATUS_WAIT_SLEEP, ///< Waiting due to a SleepThread SVC
THREADSTATUS_WAIT_IPC, ///< Waiting for the reply from an IPC request
THREADSTATUS_WAIT_SYNCH_ANY, ///< Waiting due to WaitSynch1 or WaitSynchN with wait_all = false
THREADSTATUS_WAIT_SYNCH_ALL, ///< Waiting due to WaitSynchronizationN with wait_all = true
THREADSTATUS_DORMANT, ///< Created but not yet made ready

62
src/core/hle/svc.cpp
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@ -18,6 +18,7 @@
#include "core/hle/kernel/errors.h"
#include "core/hle/kernel/event.h"
#include "core/hle/kernel/handle_table.h"
#include "core/hle/kernel/ipc.h"
#include "core/hle/kernel/memory.h"
#include "core/hle/kernel/mutex.h"
#include "core/hle/kernel/process.h"
@ -241,8 +242,6 @@ static ResultCode SendSyncRequest(Kernel::Handle handle) {
Core::System::GetInstance().PrepareReschedule();
// TODO(Subv): svcSendSyncRequest should put the caller thread to sleep while the server
// responds and cause a reschedule.
return session->SendSyncRequest(Kernel::GetCurrentThread());
}
@ -455,6 +454,33 @@ static ResultCode WaitSynchronizationN(s32* out, VAddr handles_address, s32 hand
}
}
static ResultCode ReceiveIPCRequest(Kernel::SharedPtr<Kernel::ServerSession> server_session,
Kernel::SharedPtr<Kernel::Thread> thread) {
if (server_session->parent->client == nullptr) {
return Kernel::ERR_SESSION_CLOSED_BY_REMOTE;
}
VAddr target_address = thread->GetCommandBufferAddress();
VAddr source_address = server_session->currently_handling->GetCommandBufferAddress();
ResultCode translation_result = Kernel::TranslateCommandBuffer(
server_session->currently_handling, thread, source_address, target_address);
// If a translation error occurred, immediately resume the client thread.
if (translation_result.IsError()) {
// Set the output of SendSyncRequest in the client thread to the translation output.
server_session->currently_handling->SetWaitSynchronizationResult(translation_result);
server_session->currently_handling->ResumeFromWait();
server_session->currently_handling = nullptr;
// TODO(Subv): This path should try to wait again on the same objects.
ASSERT_MSG(false, "ReplyAndReceive translation error behavior unimplemented");
}
return translation_result;
}
/// In a single operation, sends a IPC reply and waits for a new request.
static ResultCode ReplyAndReceive(s32* index, VAddr handles_address, s32 handle_count,
Kernel::Handle reply_target) {
@ -497,7 +523,15 @@ static ResultCode ReplyAndReceive(s32* index, VAddr handles_address, s32 handle_
return Kernel::ERR_SESSION_CLOSED_BY_REMOTE;
}
// TODO(Subv): Perform IPC translation from the current thread to request_thread.
VAddr source_address = Kernel::GetCurrentThread()->GetCommandBufferAddress();
VAddr target_address = request_thread->GetCommandBufferAddress();
ResultCode translation_result = Kernel::TranslateCommandBuffer(
Kernel::GetCurrentThread(), request_thread, source_address, target_address);
// Note: The real kernel seems to always panic if the Server->Client buffer translation
// fails for whatever reason.
ASSERT(translation_result.IsSuccess());
// Note: The scheduler is not invoked here.
request_thread->ResumeFromWait();
@ -526,14 +560,11 @@ static ResultCode ReplyAndReceive(s32* index, VAddr handles_address, s32 handle_
object->Acquire(thread);
*index = static_cast<s32>(std::distance(objects.begin(), itr));
if (object->GetHandleType() == Kernel::HandleType::ServerSession) {
auto server_session = static_cast<Kernel::ServerSession*>(object);
if (server_session->parent->client == nullptr)
return Kernel::ERR_SESSION_CLOSED_BY_REMOTE;
// TODO(Subv): Perform IPC translation from the ServerSession to the current thread.
}
if (object->GetHandleType() != Kernel::HandleType::ServerSession)
return RESULT_SUCCESS;
auto server_session = static_cast<Kernel::ServerSession*>(object);
return ReceiveIPCRequest(server_session, Kernel::GetCurrentThread());
}
// No objects were ready to be acquired, prepare to suspend the thread.
@ -556,10 +587,15 @@ static ResultCode ReplyAndReceive(s32* index, VAddr handles_address, s32 handle_
ASSERT(thread->status == THREADSTATUS_WAIT_SYNCH_ANY);
ASSERT(reason == ThreadWakeupReason::Signal);
thread->SetWaitSynchronizationResult(RESULT_SUCCESS);
thread->SetWaitSynchronizationOutput(thread->GetWaitObjectIndex(object.get()));
ResultCode result = RESULT_SUCCESS;
// TODO(Subv): Perform IPC translation upon wakeup.
if (object->GetHandleType() == Kernel::HandleType::ServerSession) {
auto server_session = Kernel::DynamicObjectCast<Kernel::ServerSession>(object);
result = ReceiveIPCRequest(server_session, thread);
}
thread->SetWaitSynchronizationResult(result);
thread->SetWaitSynchronizationOutput(thread->GetWaitObjectIndex(object.get()));
};
Core::System::GetInstance().PrepareReschedule();