summaryrefslogtreecommitdiffstats
path: root/src/core/hle/ipc_helpers.h
blob: 4c9b0de288dce96999230bd2b60f31b3510e4c05 (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
// Copyright 2016 Citra Emulator Project
// Licensed under GPLv2 or any later version
// Refer to the license.txt file included.

#pragma once

#include <array>
#include <tuple>
#include <type_traits>
#include <utility>
#include "core/hle/ipc.h"
#include "core/hle/kernel/client_port.h"
#include "core/hle/kernel/client_session.h"
#include "core/hle/kernel/domain.h"
#include "core/hle/kernel/handle_table.h"
#include "core/hle/kernel/hle_ipc.h"
#include "core/hle/kernel/kernel.h"
#include "core/hle/kernel/server_port.h"

namespace IPC {

class RequestHelperBase {
protected:
    Kernel::HLERequestContext* context = nullptr;
    u32* cmdbuf;
    ptrdiff_t index = 0;

public:
    RequestHelperBase(u32* command_buffer) : cmdbuf(command_buffer) {}

    RequestHelperBase(Kernel::HLERequestContext& context)
        : context(&context), cmdbuf(context.CommandBuffer()) {}

    void ValidateHeader() {
        // DEBUG_ASSERT_MSG(index == TotalSize(), "Operations do not match the header (cmd 0x%x)",
        //                 header.raw);
    }

    void Skip(unsigned 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(4 - (index & 3), true);
        }
    }

    unsigned GetCurrentOffset() const {
        return static_cast<unsigned>(index);
    }

    void SetCurrentOffset(unsigned offset) {
        index = static_cast<ptrdiff_t>(offset);
    }
};

class RequestBuilder : public RequestHelperBase {
public:
    RequestBuilder(u32* command_buffer) : RequestHelperBase(command_buffer) {}

    RequestBuilder(Kernel::HLERequestContext& context, unsigned normal_params_size,
                   u32 num_handles_to_copy = 0, u32 num_handles_to_move = 0,
                   u32 num_domain_objects = 0)
        : RequestHelperBase(context) {
        memset(cmdbuf, 0, sizeof(u32) * IPC::COMMAND_BUFFER_LENGTH);

        context.ClearIncomingObjects();

        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 = sizeof(IPC::DataPayloadHeader) / 4 + 4 + normal_params_size;
        if (context.IsDomain()) {
            raw_data_size += sizeof(DomainMessageHeader) / 4 + num_domain_objects;
        } else {
            // If we're not in a domain, turn the domain object parameters into move handles.
            num_handles_to_move += num_domain_objects;
            num_domain_objects = 0;
        }

        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);
            Skip(num_handles_to_copy + num_handles_to_move, true);
        }

        AlignWithPadding();

        if (context.IsDomain()) {
            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);
    }

    template <class T, class... Args>
    void PushIpcInterface(Args&&... args) {
        auto iface = std::make_shared<T>(std::forward<Args>(args)...);
        if (context->IsDomain()) {
            context->AddDomainObject(std::move(iface));
        } else {
            auto port = iface->CreatePort();
            auto session = port->Connect();
            ASSERT(session.Succeeded());
            context->AddMoveObject(std::move(session).Unwrap());
        }
    }

    // Validate on destruction, as there shouldn't be any case where we don't want it
    ~RequestBuilder() {
        ValidateHeader();
    }

    template <typename T>
    void Push(T value);

    template <typename First, typename... Other>
    void Push(const First& first_value, const Other&... other_values);

    /**
     * @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(Kernel::SharedPtr<O>... pointers);

    template <typename... O>
    void PushCopyObjects(Kernel::SharedPtr<O>... pointers);
};

/// Push ///

template <>
inline void RequestBuilder::Push(u32 value) {
    cmdbuf[index++] = value;
}

template <typename T>
void RequestBuilder::PushRaw(const T& value) {
    std::memcpy(cmdbuf + index, &value, sizeof(T));
    index += (sizeof(T) + 3) / 4; // round up to word length
}

template <>
inline void RequestBuilder::Push(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);
}

template <>
inline void RequestBuilder::Push(u8 value) {
    PushRaw(value);
}

template <>
inline void RequestBuilder::Push(u16 value) {
    PushRaw(value);
}

template <>
inline void RequestBuilder::Push(u64 value) {
    Push(static_cast<u32>(value));
    Push(static_cast<u32>(value >> 32));
}

template <>
inline void RequestBuilder::Push(bool value) {
    Push(static_cast<u8>(value));
}

template <typename First, typename... Other>
void RequestBuilder::Push(const First& first_value, const Other&... other_values) {
    Push(first_value);
    Push(other_values...);
}

template <typename... O>
inline void RequestBuilder::PushCopyObjects(Kernel::SharedPtr<O>... pointers) {
    auto objects = {pointers...};
    for (auto& object : objects) {
        context->AddCopyObject(std::move(object));
    }
}

template <typename... O>
inline void RequestBuilder::PushMoveObjects(Kernel::SharedPtr<O>... pointers) {
    auto objects = {pointers...};
    for (auto& object : objects) {
        context->AddMoveObject(std::move(object));
    }
}

class RequestParser : public RequestHelperBase {
public:
    RequestParser(u32* command_buffer) : RequestHelperBase(command_buffer) {}

    RequestParser(Kernel::HLERequestContext& context) : RequestHelperBase(context) {
        ASSERT_MSG(context.GetDataPayloadOffset(), "context is incomplete");
        Skip(context.GetDataPayloadOffset(), false);
        // Skip the u64 command id, it's already stored in the context
        static constexpr u32 CommandIdSize = 2;
        Skip(CommandIdSize, false);
    }

    RequestBuilder MakeBuilder(u32 normal_params_size, u32 num_handles_to_copy,
                               u32 num_handles_to_move, u32 num_domain_objects,
                               bool validate_header = true) {
        if (validate_header) {
            ValidateHeader();
        }

        return {*context, normal_params_size, num_handles_to_copy, num_handles_to_move,
                num_domain_objects};
    }

    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);

    /**
     * @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 <typename T>
    Kernel::SharedPtr<T> GetMoveObject(size_t index);

    template <typename T>
    Kernel::SharedPtr<T> GetCopyObject(size_t index);
};

/// Pop ///

template <>
inline u32 RequestParser::Pop() {
    return cmdbuf[index++];
}

template <typename T>
void RequestParser::PopRaw(T& value) {
    std::memcpy(&value, cmdbuf + index, sizeof(T));
    index += (sizeof(T) + 3) / 4; // round up to word length
}

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 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...);
}

template <typename T>
Kernel::SharedPtr<T> RequestParser::GetMoveObject(size_t index) {
    return context->GetMoveObject<T>(index);
}

template <typename T>
Kernel::SharedPtr<T> RequestParser::GetCopyObject(size_t index) {
    return context->GetCopyObject<T>(index);
}

} // namespace IPC