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Atmosphere/libraries/libvapours/include/vapours/svc/ipc/svc_message_buffer.hpp

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svc: add ipc accessor boilerplate
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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/>.
*/
#pragma once
#include <vapours/svc/svc_types_common.hpp>
#include <vapours/svc/svc_select_thread_local_region.hpp>
namespace ams::svc::ipc {
ALWAYS_INLINE u32 *GetMessageBuffer() {
return GetThreadLocalRegion()->message_buffer;
}
constexpr inline size_t MessageBufferSize = sizeof(::ams::svc::ThreadLocalRegion::message_buffer);
class MessageBuffer {
public:
class MessageHeader {
private:
/* Define fields for the first header word. */
using Tag = util::BitPack32::Field<0, BITSIZEOF(u16), u16>;
using PointerCount = util::BitPack32::Field<Tag::Next, 4, s32>;
using SendCount = util::BitPack32::Field<PointerCount::Next, 4, s32>;
using ReceiveCount = util::BitPack32::Field<SendCount::Next, 4, s32>;
using ExchangeCount = util::BitPack32::Field<ReceiveCount::Next, 4, s32>;
static_assert(ExchangeCount::Next == BITSIZEOF(u32));
/* Define fields for the second header word. */
using RawCount = util::BitPack32::Field<0, 10, s32>;
using ReceiveListCount = util::BitPack32::Field<RawCount::Next, 4, s32>;
using Reserved0 = util::BitPack32::Field<ReceiveListCount::Next, 6, u32>;
using ReceiveListOffset = util::BitPack32::Field<Reserved0::Next, 11, s32>;
using HasSpecialHeader = util::BitPack32::Field<ReceiveListOffset::Next, 1, bool>;
static constexpr inline u64 NullTag = 0;
static_assert(HasSpecialHeader::Next == BITSIZEOF(u32));
public:
enum ReceiveListCountType {
ReceiveListCountType_None = 0,
ReceiveListCountType_ToMessageBuffer = 1,
ReceiveListCountType_ToSingleBuffer = 2,
ReceiveListCountType_CountOffset = 2,
ReceiveListCountType_CountMax = 13,
};
private:
util::BitPack32 header[2];
public:
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constexpr ALWAYS_INLINE MessageHeader() : header{util::BitPack32{0}, util::BitPack32{0}} {
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this->header[0].Set<Tag>(NullTag);
}
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constexpr ALWAYS_INLINE MessageHeader(u16 tag, bool special, s32 ptr, s32 send, s32 recv, s32 exch, s32 raw, s32 recv_list) : header{util::BitPack32{0}, util::BitPack32{0}} {
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this->header[0].Set<Tag>(tag);
this->header[0].Set<PointerCount>(ptr);
this->header[0].Set<SendCount>(send);
this->header[0].Set<ReceiveCount>(recv);
this->header[0].Set<ExchangeCount>(exch);
this->header[1].Set<RawCount>(raw);
this->header[1].Set<ReceiveListCount>(recv_list);
this->header[1].Set<HasSpecialHeader>(special);
}
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ALWAYS_INLINE explicit MessageHeader(const MessageBuffer &buf) : header{util::BitPack32{0}, util::BitPack32{0}} {
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buf.Get(0, this->header, util::size(this->header));
}
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ALWAYS_INLINE explicit MessageHeader(const u32 *msg) : header{util::BitPack32{msg[0]}, util::BitPack32{msg[1]}} { /* ... */ }
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constexpr ALWAYS_INLINE u16 GetTag() const {
return this->header[0].Get<Tag>();
}
constexpr ALWAYS_INLINE s32 GetPointerCount() const {
return this->header[0].Get<PointerCount>();
}
constexpr ALWAYS_INLINE s32 GetSendCount() const {
return this->header[0].Get<SendCount>();
}
constexpr ALWAYS_INLINE s32 GetReceiveCount() const {
return this->header[0].Get<ReceiveCount>();
}
constexpr ALWAYS_INLINE s32 GetExchangeCount() const {
return this->header[0].Get<ExchangeCount>();
}
constexpr ALWAYS_INLINE s32 GetMapAliasCount() const {
return this->GetSendCount() + this->GetReceiveCount() + this->GetExchangeCount();
}
constexpr ALWAYS_INLINE s32 GetRawCount() const {
return this->header[1].Get<RawCount>();
}
constexpr ALWAYS_INLINE s32 GetReceiveListCount() const {
return this->header[1].Get<ReceiveListCount>();
}
constexpr ALWAYS_INLINE s32 GetReceiveListOffset() const {
return this->header[1].Get<ReceiveListOffset>();
}
constexpr ALWAYS_INLINE bool GetHasSpecialHeader() const {
return this->header[1].Get<HasSpecialHeader>();
}
constexpr ALWAYS_INLINE void SetReceiveListCount(s32 recv_list) {
this->header[1].Set<ReceiveListCount>(recv_list);
}
constexpr ALWAYS_INLINE const util::BitPack32 *GetData() const {
return this->header;
}
static constexpr ALWAYS_INLINE size_t GetDataSize() {
return sizeof(header);
}
};
class SpecialHeader {
private:
/* Define fields for the header word. */
using HasProcessId = util::BitPack32::Field<0, 1, bool>;
using CopyHandleCount = util::BitPack32::Field<HasProcessId::Next, 4, s32>;
using MoveHandleCount = util::BitPack32::Field<CopyHandleCount::Next, 4, s32>;
private:
util::BitPack32 header;
bool has_header;
public:
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constexpr ALWAYS_INLINE explicit SpecialHeader(bool pid, s32 copy, s32 move) : header{0}, has_header(true) {
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this->header.Set<HasProcessId>(pid);
this->header.Set<CopyHandleCount>(copy);
this->header.Set<MoveHandleCount>(move);
}
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ALWAYS_INLINE explicit SpecialHeader(const MessageBuffer &buf, const MessageHeader &hdr) : header{0}, has_header(hdr.GetHasSpecialHeader()) {
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if (this->has_header) {
buf.Get(MessageHeader::GetDataSize() / sizeof(util::BitPack32), std::addressof(this->header), sizeof(this->header) / sizeof(util::BitPack32));
}
}
constexpr ALWAYS_INLINE bool GetHasProcessId() const {
return this->header.Get<HasProcessId>();
}
constexpr ALWAYS_INLINE bool GetCopyHandleCount() const {
return this->header.Get<CopyHandleCount>();
}
constexpr ALWAYS_INLINE bool GetMoveHandleCount() const {
return this->header.Get<MoveHandleCount>();
}
constexpr ALWAYS_INLINE const util::BitPack32 *GetHeader() const {
return std::addressof(this->header);
}
constexpr ALWAYS_INLINE size_t GetHeaderSize() const {
if (this->has_header) {
return sizeof(this->header);
} else {
return 0;
}
}
constexpr ALWAYS_INLINE size_t GetDataSize() const {
if (this->has_header) {
return (this->GetHasProcessId() ? sizeof(u64) : 0) +
(this->GetCopyHandleCount() * sizeof(Handle)) +
(this->GetMoveHandleCount() * sizeof(Handle));
} else {
return 0;
}
}
};
class MapAliasDescriptor {
public:
enum Attribute {
Attribute_Ipc = 0,
Attribute_NonSecureIpc = 1,
Attribute_NonDeviceIpc = 3,
};
private:
/* Define fields for the first two words. */
using SizeLow = util::BitPack32::Field<0, BITSIZEOF(u32), u32>;
using AddressLow = util::BitPack32::Field<0, BITSIZEOF(u32), u32>;
/* Define fields for the packed descriptor word. */
using Attributes = util::BitPack32::Field<0, 2, Attribute>;
using AddressHigh = util::BitPack32::Field<Attributes::Next, 3, u32>;
using Reserved = util::BitPack32::Field<AddressHigh::Next, 19, u32>;
using SizeHigh = util::BitPack32::Field<Reserved::Next, 4, u32>;
using AddressMid = util::BitPack32::Field<SizeHigh::Next, 4, u32>;
constexpr ALWAYS_INLINE u32 GetAddressMid(u64 address) {
return static_cast<u32>(address >> AddressLow::Count) & ((1u << AddressMid::Count) - 1);
}
constexpr ALWAYS_INLINE u32 GetAddressHigh(u64 address) {
return static_cast<u32>(address >> (AddressLow::Count + AddressMid::Count));
}
private:
util::BitPack32 data[3];
public:
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constexpr ALWAYS_INLINE MapAliasDescriptor() : data{util::BitPack32{0}, util::BitPack32{0}, util::BitPack32{0}} { /* ... */ }
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ALWAYS_INLINE MapAliasDescriptor(const void *buffer, size_t _size, Attribute attr = Attribute_Ipc) : data{util::BitPack32{0}, util::BitPack32{0}, util::BitPack32{0}} {
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const u64 address = reinterpret_cast<u64>(buffer);
const u64 size = static_cast<u64>(_size);
this->data[0] = { static_cast<u32>(size) };
this->data[1] = { static_cast<u32>(address) };
this->data[2].Set<Attributes>(attr);
this->data[2].Set<AddressMid>(GetAddressMid(address));
this->data[2].Set<SizeHigh>(static_cast<u32>(size >> SizeLow::Count));
this->data[2].Set<AddressHigh>(GetAddressHigh(address));
}
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ALWAYS_INLINE MapAliasDescriptor(const MessageBuffer &buf, s32 index) : data{util::BitPack32{0}, util::BitPack32{0}, util::BitPack32{0}} {
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buf.Get(index, this->data, util::size(this->data));
}
constexpr ALWAYS_INLINE uintptr_t GetAddress() const {
const u64 address = (static_cast<u64>((this->data[2].Get<AddressHigh>() << AddressMid::Count) | this->data[2].Get<AddressMid>()) << AddressLow::Count) | this->data[1].Get<AddressLow>();
return address;
}
constexpr ALWAYS_INLINE uintptr_t GetSize() const {
const u64 size = (static_cast<u64>(this->data[2].Get<SizeHigh>()) << SizeLow::Count) | this->data[0].Get<SizeLow>();
return size;
}
constexpr ALWAYS_INLINE Attribute GetAttribute() const {
return this->data[2].Get<Attributes>();
}
constexpr ALWAYS_INLINE const util::BitPack32 *GetData() const {
return this->data;
}
static constexpr ALWAYS_INLINE size_t GetDataSize() {
return sizeof(data);
}
};
class PointerDescriptor {
private:
/* Define fields for the packed descriptor word. */
using Index = util::BitPack32::Field<0, 4, s32>;
using Reserved0 = util::BitPack32::Field<Index::Next, 2, u32>;
using AddressHigh = util::BitPack32::Field<Reserved0::Next, 3, u32>;
using Reserved1 = util::BitPack32::Field<AddressHigh::Next, 3, u32>;
using AddressMid = util::BitPack32::Field<Reserved1::Next, 4, u32>;
using Size = util::BitPack32::Field<AddressMid::Next, 16, u32>;
/* Define fields for the second word. */
using AddressLow = util::BitPack32::Field<0, BITSIZEOF(u32), u32>;
constexpr ALWAYS_INLINE u32 GetAddressMid(u64 address) {
return static_cast<u32>(address >> AddressLow::Count) & ((1u << AddressMid::Count) - 1);
}
constexpr ALWAYS_INLINE u32 GetAddressHigh(u64 address) {
return static_cast<u32>(address >> (AddressLow::Count + AddressMid::Count));
}
private:
util::BitPack32 data[2];
public:
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constexpr ALWAYS_INLINE PointerDescriptor() : data{util::BitPack32{0}, util::BitPack32{0}} { /* ... */ }
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ALWAYS_INLINE PointerDescriptor(const void *buffer, size_t size, s32 index) : data{util::BitPack32{0}, util::BitPack32{0}} {
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const u64 address = reinterpret_cast<u64>(buffer);
this->data[0].Set<Index>(index);
this->data[0].Set<AddressHigh>(GetAddressHigh(address));
this->data[0].Set<AddressMid>(GetAddressMid(address));
this->data[0].Set<Size>(size);
this->data[1] = { static_cast<u32>(address) };
}
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ALWAYS_INLINE PointerDescriptor(const MessageBuffer &buf, s32 index) : data{util::BitPack32{0}, util::BitPack32{0}} {
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buf.Get(index, this->data, util::size(this->data));
}
constexpr ALWAYS_INLINE s32 GetIndex() const {
return this->data[0].Get<Index>();
}
constexpr ALWAYS_INLINE uintptr_t GetAddress() const {
const u64 address = (static_cast<u64>((this->data[0].Get<AddressHigh>() << AddressMid::Count) | this->data[0].Get<AddressMid>()) << AddressLow::Count) | this->data[1].Get<AddressLow>();
return address;
}
constexpr ALWAYS_INLINE size_t GetSize() const {
return this->data[0].Get<Size>();
}
constexpr ALWAYS_INLINE const util::BitPack32 *GetData() const {
return this->data;
}
static constexpr ALWAYS_INLINE size_t GetDataSize() {
return sizeof(data);
}
};
class ReceiveListEntry {
private:
/* Define fields for the first word. */
using AddressLow = util::BitPack32::Field<0, BITSIZEOF(u32), u32>;
/* Define fields for the packed descriptor word. */
using AddressHigh = util::BitPack32::Field<0, 7, u32>;
using Reserved = util::BitPack32::Field<AddressHigh::Next, 9, u32>;
using Size = util::BitPack32::Field<Reserved::Next, 16, u32>;
constexpr ALWAYS_INLINE u32 GetAddressHigh(u64 address) {
return static_cast<u32>(address >> (AddressLow::Count));
}
private:
util::BitPack32 data[2];
public:
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constexpr ALWAYS_INLINE ReceiveListEntry() : data{util::BitPack32{0}, util::BitPack32{0}} { /* ... */ }
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ALWAYS_INLINE ReceiveListEntry(const void *buffer, size_t size) : data{util::BitPack32{0}, util::BitPack32{0}} {
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const u64 address = reinterpret_cast<u64>(buffer);
this->data[0] = { static_cast<u32>(address) };
this->data[1].Set<AddressHigh>(GetAddressHigh(address));
this->data[1].Set<Size>(size);
}
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ALWAYS_INLINE ReceiveListEntry(u32 a, u32 b) : data{util::BitPack32{a}, util::BitPack32{b}} { /* ... */ }
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constexpr ALWAYS_INLINE uintptr_t GetAddress() {
const u64 address = (static_cast<u64>(this->data[1].Get<AddressHigh>()) << AddressLow::Count) | this->data[0].Get<AddressLow>();
return address;
}
constexpr ALWAYS_INLINE size_t GetSize() const {
return this->data[1].Get<Size>();
}
constexpr ALWAYS_INLINE const util::BitPack32 *GetData() const {
return this->data;
}
static constexpr ALWAYS_INLINE size_t GetDataSize() {
return sizeof(data);
}
};
private:
u32 *buffer;
size_t size;
public:
constexpr MessageBuffer(u32 *b, size_t sz) : buffer(b), size(sz) { /* ... */ }
constexpr explicit MessageBuffer(u32 *b) : buffer(b), size(sizeof(::ams::svc::ThreadLocalRegion::message_buffer)) { /* ... */ }
constexpr ALWAYS_INLINE size_t GetBufferSize() const {
return this->size;
}
ALWAYS_INLINE void Get(s32 index, util::BitPack32 *dst, size_t count) const {
/* Ensure that this doesn't get re-ordered. */
__asm__ __volatile__("" ::: "memory");
/* Get the words. */
static_assert(sizeof(*dst) == sizeof(*this->buffer));
#pragma GCC diagnostic push
#pragma GCC diagnostic ignored "-Wclass-memaccess"
__builtin_memcpy(dst, this->buffer + index, count * sizeof(*dst));
#pragma GCC diagnostic pop
}
ALWAYS_INLINE s32 Set(s32 index, const util::BitPack32 *src, size_t count) const {
/* Ensure that this doesn't get re-ordered. */
__asm__ __volatile__("" ::: "memory");
/* Set the words. */
__builtin_memcpy(this->buffer + index, src, count * sizeof(*src));
/* Ensure that this doesn't get re-ordered. */
__asm__ __volatile__("" ::: "memory");
return index + count;
}
template<typename T>
ALWAYS_INLINE const T &GetRaw(s32 index) const {
return *reinterpret_cast<const T *>(this->buffer + index);
}
template<typename T>
ALWAYS_INLINE s32 SetRaw(s32 index, const T &val) {
*reinterpret_cast<const T *>(this->buffer + index) = val;
return index + (util::AlignUp(sizeof(val), sizeof(*this->buffer)) / sizeof(*this->buffer));
}
ALWAYS_INLINE void GetRawArray(s32 index, void *dst, size_t len) {
__builtin_memcpy(dst, this->buffer + index, len);
}
ALWAYS_INLINE void SetRawArray(s32 index, const void *src, size_t len) {
__builtin_memcpy(this->buffer + index, src, len);
}
ALWAYS_INLINE void SetNull() const {
this->Set(MessageHeader());
}
ALWAYS_INLINE s32 Set(const MessageHeader &hdr) const {
__builtin_memcpy(this->buffer, hdr.GetData(), hdr.GetDataSize());
return hdr.GetDataSize() / sizeof(*this->buffer);
}
ALWAYS_INLINE s32 Set(const SpecialHeader &spc) const {
const s32 index = MessageHeader::GetDataSize() / sizeof(*this->buffer);
__builtin_memcpy(this->buffer + index, spc.GetHeader(), spc.GetHeaderSize());
return index + (spc.GetHeaderSize() / sizeof(*this->buffer));
}
ALWAYS_INLINE s32 SetHandle(s32 index, const ::ams::svc::Handle &hnd) {
static_assert(util::IsAligned(sizeof(hnd), sizeof(*this->buffer)));
__builtin_memcpy(this->buffer + index, std::addressof(hnd), sizeof(hnd));
return index + (sizeof(hnd) / sizeof(*this->buffer));
}
ALWAYS_INLINE s32 SetProcessId(s32 index, const u64 pid) {
static_assert(util::IsAligned(sizeof(pid), sizeof(*this->buffer)));
__builtin_memcpy(this->buffer + index, std::addressof(pid), sizeof(pid));
return index + (sizeof(pid) / sizeof(*this->buffer));
}
ALWAYS_INLINE s32 Set(s32 index, const MapAliasDescriptor &desc) {
__builtin_memcpy(this->buffer + index, desc.GetData(), desc.GetDataSize());
return index + (desc.GetDataSize() / sizeof(*this->buffer));
}
ALWAYS_INLINE s32 Set(s32 index, const PointerDescriptor &desc) {
__builtin_memcpy(this->buffer + index, desc.GetData(), desc.GetDataSize());
return index + (desc.GetDataSize() / sizeof(*this->buffer));
}
ALWAYS_INLINE s32 Set(s32 index, const ReceiveListEntry &desc) {
__builtin_memcpy(this->buffer + index, desc.GetData(), desc.GetDataSize());
return index + (desc.GetDataSize() / sizeof(*this->buffer));
}
ALWAYS_INLINE s32 Set(s32 index, const u32 val) {
static_assert(util::IsAligned(sizeof(val), sizeof(*this->buffer)));
__builtin_memcpy(this->buffer + index, std::addressof(val), sizeof(val));
return index + (sizeof(val) / sizeof(*this->buffer));
}
ALWAYS_INLINE Result GetAsyncResult() const {
MessageHeader hdr(this->buffer);
MessageHeader null{};
R_SUCCEED_IF(AMS_UNLIKELY((__builtin_memcmp(hdr.GetData(), null.GetData(), MessageHeader::GetDataSize()) != 0)));
return this->buffer[MessageHeader::GetDataSize() / sizeof(*this->buffer)];
}
ALWAYS_INLINE void SetAsyncResult(Result res) const {
const s32 index = this->Set(MessageHeader());
const auto value = res.GetValue();
static_assert(util::IsAligned(sizeof(value), sizeof(*this->buffer)));
__builtin_memcpy(this->buffer + index, std::addressof(value), sizeof(value));
}
ALWAYS_INLINE u64 GetProcessId(s32 index) const {
u64 pid;
__builtin_memcpy(std::addressof(pid), this->buffer + index, sizeof(pid));
return pid;
}
ALWAYS_INLINE ams::svc::Handle GetHandle(s32 index) const {
static_assert(sizeof(ams::svc::Handle) == sizeof(*this->buffer));
return ::ams::svc::Handle(this->buffer[index]);
}
static constexpr ALWAYS_INLINE s32 GetSpecialDataIndex(const MessageHeader &hdr, const SpecialHeader &spc) {
return (MessageHeader::GetDataSize() / sizeof(util::BitPack32)) + (spc.GetHeaderSize() / sizeof(util::BitPack32));
}
static constexpr ALWAYS_INLINE s32 GetPointerDescriptorIndex(const MessageHeader &hdr, const SpecialHeader &spc) {
return GetSpecialDataIndex(hdr, spc) + (spc.GetDataSize() / sizeof(util::BitPack32));
}
static constexpr ALWAYS_INLINE s32 GetMapAliasDescriptorIndex(const MessageHeader &hdr, const SpecialHeader &spc) {
return GetPointerDescriptorIndex(hdr, spc) + (hdr.GetPointerCount() * PointerDescriptor::GetDataSize() / sizeof(util::BitPack32));
}
static constexpr ALWAYS_INLINE s32 GetRawDataIndex(const MessageHeader &hdr, const SpecialHeader &spc) {
return GetMapAliasDescriptorIndex(hdr, spc) + (hdr.GetMapAliasCount() * MapAliasDescriptor::GetDataSize() / sizeof(util::BitPack32));
}
static constexpr ALWAYS_INLINE s32 GetReceiveListIndex(const MessageHeader &hdr, const SpecialHeader &spc) {
if (const s32 recv_list_index = hdr.GetReceiveListOffset()) {
return recv_list_index;
} else {
return GetRawDataIndex(hdr, spc) + hdr.GetRawCount();
}
}
static constexpr ALWAYS_INLINE s32 GetMessageBufferSize(const MessageHeader &hdr, const SpecialHeader &spc) {
/* Get the size of the plain message. */
size_t msg_size = GetReceiveListIndex(hdr, spc) * sizeof(util::BitPack32);
/* Add the size of the receive list. */
const auto count = hdr.GetReceiveListCount();
switch (count) {
case MessageHeader::ReceiveListCountType_None:
break;
case MessageHeader::ReceiveListCountType_ToMessageBuffer:
break;
case MessageHeader::ReceiveListCountType_ToSingleBuffer:
msg_size += ReceiveListEntry::GetDataSize();
break;
default:
msg_size += (count - MessageHeader::ReceiveListCountType_CountOffset) * ReceiveListEntry::GetDataSize();
break;
}
return msg_size;
}
};
}
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