// Copyright 2016 Citra Emulator Project
// Licensed under GPLv2 or any later version
// Refer to the license.txt file included.
#pragma once
#include <cstring>
#include <memory>
#include <type_traits>
#include <utility>
#include "common/assert.h"
#include "common/common_types.h"
#include "core/hle/ipc.h"
#include "core/hle/kernel/hle_ipc.h"
#include "core/hle/kernel/k_process.h"
#include "core/hle/kernel/k_resource_limit.h"
#include "core/hle/kernel/k_session.h"
#include "core/hle/result.h"
namespace IPC {
constexpr ResultCode ERR_REMOTE_PROCESS_DEAD{ErrorModule::HIPC, 301};
class RequestHelperBase {
protected:
Kernel::HLERequestContext* context = nullptr;
u32* cmdbuf;
u32 index = 0;
public:
explicit RequestHelperBase(u32* command_buffer) : cmdbuf(command_buffer) {}
explicit RequestHelperBase(Kernel::HLERequestContext& ctx)
: context(&ctx), cmdbuf(ctx.CommandBuffer()) {}
void Skip(u32 size_in_words, bool set_to_null) {
if (set_to_null) {
memset(cmdbuf + index, 0, size_in_words * sizeof(u32));
}
index += size_in_words;
}
/**
* Aligns the current position forward to a 16-byte boundary, padding with zeros.
*/
void AlignWithPadding() {
if (index & 3) {
Skip(static_cast<u32>(4 - (index & 3)), true);
}
}
u32 GetCurrentOffset() const {
return index;
}
void SetCurrentOffset(u32 offset) {
index = offset;
}
};
class ResponseBuilder : public RequestHelperBase {
public:
/// Flags used for customizing the behavior of ResponseBuilder
enum class Flags : u32 {
None = 0,
/// Uses move handles to move objects in the response, even when in a domain. This is
/// required when PushMoveObjects is used.
AlwaysMoveHandles = 1,
};
explicit ResponseBuilder(Kernel::HLERequestContext& ctx, u32 normal_params_size_,
u32 num_handles_to_copy_ = 0, u32 num_objects_to_move_ = 0,
Flags flags = Flags::None)
: RequestHelperBase(ctx), normal_params_size(normal_params_size_),
num_handles_to_copy(num_handles_to_copy_),
num_objects_to_move(num_objects_to_move_), kernel{ctx.kernel} {
memset(cmdbuf, 0, sizeof(u32) * IPC::COMMAND_BUFFER_LENGTH);
IPC::CommandHeader header{};
// The entire size of the raw data section in u32 units, including the 16 bytes of mandatory
// padding.
u32 raw_data_size = ctx.write_size =
ctx.IsTipc() ? normal_params_size - 1 : normal_params_size;
u32 num_handles_to_move{};
u32 num_domain_objects{};
const bool always_move_handles{
(static_cast<u32>(flags) & static_cast<u32>(Flags::AlwaysMoveHandles)) != 0};
if (!ctx.Session()->IsDomain() || always_move_handles) {
num_handles_to_move = num_objects_to_move;
} else {
num_domain_objects = num_objects_to_move;
}
if (ctx.Session()->IsDomain()) {
raw_data_size +=
static_cast<u32>(sizeof(DomainMessageHeader) / sizeof(u32) + num_domain_objects);
ctx.write_size += num_domain_objects;
}
if (ctx.IsTipc()) {
header.type.Assign(ctx.GetCommandType());
} else {
raw_data_size += static_cast<u32>(sizeof(IPC::DataPayloadHeader) / sizeof(u32) + 4 +
normal_params_size);
}
header.data_size.Assign(raw_data_size);
if (num_handles_to_copy || num_handles_to_move) {
header.enable_handle_descriptor.Assign(1);
}
PushRaw(header);
if (header.enable_handle_descriptor) {
IPC::HandleDescriptorHeader handle_descriptor_header{};
handle_descriptor_header.num_handles_to_copy.Assign(num_handles_to_copy_);
handle_descriptor_header.num_handles_to_move.Assign(num_handles_to_move);
PushRaw(handle_descriptor_header);
ctx.handles_offset = index;
Skip(num_handles_to_copy + num_handles_to_move, true);
}
if (!ctx.IsTipc()) {
AlignWithPadding();
if (ctx.Session()->IsDomain() && ctx.HasDomainMessageHeader()) {
IPC::DomainMessageHeader domain_header{};
domain_header.num_objects = num_domain_objects;
PushRaw(domain_header);
}
IPC::DataPayloadHeader data_payload_header{};
data_payload_header.magic = Common::MakeMagic('S', 'F', 'C', 'O');
PushRaw(data_payload_header);
}
data_payload_index = index;
ctx.data_payload_offset = index;
ctx.write_size += index;
ctx.domain_offset = static_cast<u32>(index + raw_data_size / sizeof(u32));
}
template <class T>
void PushIpcInterface(std::shared_ptr<T> iface) {
if (context->Session()->IsDomain()) {
context->AddDomainObject(std::move(iface));
} else {
kernel.CurrentProcess()->GetResourceLimit()->Reserve(
Kernel::LimitableResource::Sessions, 1);
auto* session = Kernel::KSession::Create(kernel);
session->Initialize(nullptr, iface->GetServiceName());
context->AddMoveObject(&session->GetClientSession());
iface->ClientConnected(&session->GetServerSession());
}
}
template <class T, class... Args>
void PushIpcInterface(Args&&... args) {
PushIpcInterface<T>(std::make_shared<T>(std::forward<Args>(args)...));
}
void PushImpl(s8 value);
void PushImpl(s16 value);
void PushImpl(s32 value);
void PushImpl(s64 value);
void PushImpl(u8 value);
void PushImpl(u16 value);
void PushImpl(u32 value);
void PushImpl(u64 value);
void PushImpl(float value);
void PushImpl(double value);
void PushImpl(bool value);
void PushImpl(ResultCode value);
template <typename T>
void Push(T value) {
return PushImpl(value);
}
template <typename First, typename... Other>
void Push(const First& first_value, const Other&... other_values);
/**
* Helper function for pushing strongly-typed enumeration values.
*
* @tparam Enum The enumeration type to be pushed
*
* @param value The value to push.
*
* @note The underlying size of the enumeration type is the size of the
* data that gets pushed. e.g. "enum class SomeEnum : u16" will
* push a u16-sized amount of data.
*/
template <typename Enum>
void PushEnum(Enum value) {
static_assert(std::is_enum_v<Enum>, "T must be an enum type within a PushEnum call.");
static_assert(!std::is_convertible_v<Enum, int>,
"enum type in PushEnum must be a strongly typed enum.");
Push(static_cast<std::underlying_type_t<Enum>>(value));
}
/**
* @brief Copies the content of the given trivially copyable class to the buffer as a normal
* param
* @note: The input class must be correctly packed/padded to fit hardware layout.
*/
template <typename T>
void PushRaw(const T& value);
template <typename... O>
void PushMoveObjects(O*... pointers);
template <typename... O>
void PushMoveObjects(O&... pointers);
template <typename... O>
void PushCopyObjects(O*... pointers);
template <typename... O>
void PushCopyObjects(O&... pointers);
private:
u32 normal_params_size{};
u32 num_handles_to_copy{};
u32 num_objects_to_move{}; ///< Domain objects or move handles, context dependent
u32 data_payload_index{};
Kernel::KernelCore& kernel;
};
/// Push ///
inline void ResponseBuilder::PushImpl(s32 value) {
cmdbuf[index++] = value;
}
inline void ResponseBuilder::PushImpl(u32 value) {
cmdbuf[index++] = value;
}
template <typename T>
void ResponseBuilder::PushRaw(const T& value) {
static_assert(std::is_trivially_copyable_v<T>,
"It's undefined behavior to use memcpy with non-trivially copyable objects");
std::memcpy(cmdbuf + index, &value, sizeof(T));
index += (sizeof(T) + 3) / 4; // round up to word length
}
inline void ResponseBuilder::PushImpl(ResultCode value) {
// Result codes are actually 64-bit in the IPC buffer, but only the high part is discarded.
Push(value.raw);
Push<u32>(0);
}
inline void ResponseBuilder::PushImpl(s8 value) {
PushRaw(value);
}
inline void ResponseBuilder::PushImpl(s16 value) {
PushRaw(value);
}
inline void ResponseBuilder::PushImpl(s64 value) {
PushImpl(static_cast<u32>(value));
PushImpl(static_cast<u32>(value >> 32));
}
inline void ResponseBuilder::PushImpl(u8 value) {
PushRaw(value);
}
inline void ResponseBuilder::PushImpl(u16 value) {
PushRaw(value);
}
inline void ResponseBuilder::PushImpl(u64 value) {
PushImpl(static_cast<u32>(value));
PushImpl(static_cast<u32>(value >> 32));
}
inline void ResponseBuilder::PushImpl(float value) {
u32 integral;
std::memcpy(&integral, &value, sizeof(u32));
PushImpl(integral);
}
inline void ResponseBuilder::PushImpl(double value) {
u64 integral;
std::memcpy(&integral, &value, sizeof(u64));
PushImpl(integral);
}
inline void ResponseBuilder::PushImpl(bool value) {
PushImpl(static_cast<u8>(value));
}
template <typename First, typename... Other>
void ResponseBuilder::Push(const First& first_value, const Other&... other_values) {
Push(first_value);
Push(other_values...);
}
template <typename... O>
inline void ResponseBuilder::PushCopyObjects(O*... pointers) {
auto objects = {pointers...};
for (auto& object : objects) {
context->AddCopyObject(object);
}
}
template <typename... O>
inline void ResponseBuilder::PushCopyObjects(O&... pointers) {
auto objects = {&pointers...};
for (auto& object : objects) {
context->AddCopyObject(object);
}
}
template <typename... O>
inline void ResponseBuilder::PushMoveObjects(O*... pointers) {
auto objects = {pointers...};
for (auto& object : objects) {
context->AddMoveObject(object);
}
}
template <typename... O>
inline void ResponseBuilder::PushMoveObjects(O&... pointers) {
auto objects = {&pointers...};
for (auto& object : objects) {
context->AddMoveObject(object);
}
}
class RequestParser : public RequestHelperBase {
public:
explicit RequestParser(u32* command_buffer) : RequestHelperBase(command_buffer) {}
explicit RequestParser(Kernel::HLERequestContext& ctx) : RequestHelperBase(ctx) {
// TIPC does not have data payload offset
if (!ctx.IsTipc()) {
ASSERT_MSG(ctx.GetDataPayloadOffset(), "context is incomplete");
Skip(ctx.GetDataPayloadOffset(), false);
}
// Skip the u64 command id, it's already stored in the context
static constexpr u32 CommandIdSize = 2;
Skip(CommandIdSize, false);
}
template <typename T>
T Pop();
template <typename T>
void Pop(T& value);
template <typename First, typename... Other>
void Pop(First& first_value, Other&... other_values);
template <typename T>
T PopEnum() {
static_assert(std::is_enum_v<T>, "T must be an enum type within a PopEnum call.");
static_assert(!std::is_convertible_v<T, int>,
"enum type in PopEnum must be a strongly typed enum.");
return static_cast<T>(Pop<std::underlying_type_t<T>>());
}
/**
* @brief Reads the next normal parameters as a struct, by copying it
* @note: The output class must be correctly packed/padded to fit hardware layout.
*/
template <typename T>
void PopRaw(T& value);
/**
* @brief Reads the next normal parameters as a struct, by copying it into a new value
* @note: The output class must be correctly packed/padded to fit hardware layout.
*/
template <typename T>
T PopRaw();
template <class T>
std::weak_ptr<T> PopIpcInterface() {
ASSERT(context->Session()->IsDomain());
ASSERT(context->GetDomainMessageHeader().input_object_count > 0);
return context->GetDomainHandler<T>(Pop<u32>() - 1);
}
};
/// Pop ///
template <>
inline u32 RequestParser::Pop() {
return cmdbuf[index++];
}
template <>
inline s32 RequestParser::Pop() {
return static_cast<s32>(Pop<u32>());
}
// Ignore the -Wclass-memaccess warning on memcpy for non-trivially default constructible objects.
#if defined(__GNUC__)
#pragma GCC diagnostic push
#pragma GCC diagnostic ignored "-Wclass-memaccess"
#endif
template <typename T>
void RequestParser::PopRaw(T& value) {
static_assert(std::is_trivially_copyable_v<T>,
"It's undefined behavior to use memcpy with non-trivially copyable objects");
std::memcpy(&value, cmdbuf + index, sizeof(T));
index += (sizeof(T) + 3) / 4; // round up to word length
}
#if defined(__GNUC__)
#pragma GCC diagnostic pop
#endif
template <typename T>
T RequestParser::PopRaw() {
T value;
PopRaw(value);
return value;
}
template <>
inline u8 RequestParser::Pop() {
return PopRaw<u8>();
}
template <>
inline u16 RequestParser::Pop() {
return PopRaw<u16>();
}
template <>
inline u64 RequestParser::Pop() {
const u64 lsw = Pop<u32>();
const u64 msw = Pop<u32>();
return msw << 32 | lsw;
}
template <>
inline s8 RequestParser::Pop() {
return static_cast<s8>(Pop<u8>());
}
template <>
inline s16 RequestParser::Pop() {
return static_cast<s16>(Pop<u16>());
}
template <>
inline s64 RequestParser::Pop() {
return static_cast<s64>(Pop<u64>());
}
template <>
inline float RequestParser::Pop() {
const u32 value = Pop<u32>();
float real;
std::memcpy(&real, &value, sizeof(real));
return real;
}
template <>
inline double RequestParser::Pop() {
const u64 value = Pop<u64>();
double real;
std::memcpy(&real, &value, sizeof(real));
return real;
}
template <>
inline bool RequestParser::Pop() {
return Pop<u8>() != 0;
}
template <>
inline ResultCode RequestParser::Pop() {
return ResultCode{Pop<u32>()};
}
template <typename T>
void RequestParser::Pop(T& value) {
value = Pop<T>();
}
template <typename First, typename... Other>
void RequestParser::Pop(First& first_value, Other&... other_values) {
first_value = Pop<First>();
Pop(other_values...);
}
} // namespace IPC
