summaryrefslogtreecommitdiffstats
path: root/src/core/hle/ipc_helpers.h
blob: 5fed3dbf5e07020bce7c44cabf34228775ab767e (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
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
// Copyright 2016 Citra Emulator Project
// Licensed under GPLv2 or any later version
// Refer to the license.txt file included.

#pragma once

#include <array>
#include <cstring>
#include <memory>
#include <tuple>
#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_client_port.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& context)
        : context(&context), cmdbuf(context.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);

        ctx.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 = ctx.IsTipc()
                                ? normal_params_size - 1
                                : sizeof(IPC::DataPayloadHeader) / 4 + 4 + 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) / 4 + num_domain_objects);
        }

        if (ctx.IsTipc()) {
            header.type.Assign(ctx.GetCommandType());
        }

        ctx.data_size = static_cast<u32>(raw_data_size);
        header.data_size.Assign(static_cast<u32>(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.domain_offset = index + raw_data_size / 4;
    }

    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 ValidateHeader() {
        const std::size_t num_domain_objects = context->NumDomainObjects();
        const std::size_t num_move_objects = context->NumMoveObjects();
        ASSERT_MSG(!num_domain_objects || !num_move_objects,
                   "cannot move normal handles and domain objects");
        ASSERT_MSG((index - data_payload_index) == normal_params_size,
                   "normal_params_size value is incorrect");
        ASSERT_MSG((num_domain_objects + num_move_objects) == num_objects_to_move,
                   "num_objects_to_move value is incorrect");
        ASSERT_MSG(context->NumCopyObjects() == num_handles_to_copy,
                   "num_handles_to_copy value is incorrect");
    }

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

    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) {
        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::shared_ptr<T> PopIpcInterface() {
        ASSERT(context->Session()->IsDomain());
        ASSERT(context->GetDomainMessageHeader().input_object_count > 0);
        return context->GetDomainRequestHandler<T>(Pop<u32>() - 1);
    }
};

/// Pop ///

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

template <>
inline s32 RequestParser::Pop() {
    return static_cast<s32>(Pop<u32>());
}

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
}

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