summaryrefslogtreecommitdiffstats
path: root/src/core/hle/ipc_helpers.h
blob: 11a33c8bd79faa358493c25c29df428517fa3969 (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
// Copyright 2016 Citra Emulator Project
// Licensed under GPLv2 or any later version
// Refer to the license.txt file included.

#pragma once
#include "core/hle/ipc.h"
#include "core/hle/kernel/kernel.h"

namespace IPC {

class RequestHelperBase {
protected:
    u32* cmdbuf;
    ptrdiff_t index = 1;
    Header header;

public:
    RequestHelperBase(u32* command_buffer, Header command_header)
        : cmdbuf(command_buffer), header(command_header) {}

    /// Returns the total size of the request in words
    size_t TotalSize() const {
        return 1 /* command header */ + header.normal_params_size + header.translate_params_size;
    }

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

    /**
     * @brief Retrieves the address of a static buffer, used when a buffer is needed for output
     * @param buffer_id The index of the static buffer
     * @param data_size If non-null, will store the size of the buffer
     */
    VAddr PeekStaticBuffer(u8 buffer_id, size_t* data_size = nullptr) const {
        u32* static_buffer = cmdbuf + Kernel::kStaticBuffersOffset / 4 + buffer_id * 2;
        if (data_size)
            *data_size = StaticBufferDescInfo{static_buffer[0]}.size;
        return static_buffer[1];
    }
};

class RequestBuilder : public RequestHelperBase {
public:
    RequestBuilder(u32* command_buffer, Header command_header)
        : RequestHelperBase(command_buffer, command_header) {
        cmdbuf[0] = header.raw;
    }
    explicit RequestBuilder(u32* command_buffer, u32 command_header)
        : RequestBuilder(command_buffer, Header{command_header}) {}
    RequestBuilder(u32* command_buffer, u16 command_id, unsigned normal_params_size,
                   unsigned translate_params_size)
        : RequestBuilder(command_buffer,
                         MakeHeader(command_id, normal_params_size, translate_params_size)) {}

    // 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);

    void Push(u32 value) {
        cmdbuf[index++] = value;
    }
    template <typename First, typename... Other>
    void Push(const First& first_value, const Other&... other_values) {
        Push(first_value);
        Push(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) {
        static_assert(std::is_trivially_copyable<T>(), "Raw types should be trivially copyable");
        std::memcpy(cmdbuf + index, &value, sizeof(T));
        index += (sizeof(T) + 3) / 4; // round up to word length
    }

    // TODO : ensure that translate params are added after all regular params
    template <typename... H>
    void PushCopyHandles(H... handles) {
        Push(CopyHandleDesc(sizeof...(H)));
        Push(static_cast<Kernel::Handle>(handles)...);
    }

    template <typename... H>
    void PushMoveHandles(H... handles) {
        Push(MoveHandleDesc(sizeof...(H)));
        Push(static_cast<Kernel::Handle>(handles)...);
    }

    void PushCurrentPIDHandle() {
        Push(CallingPidDesc());
        Push(u32(0));
    }

    void PushStaticBuffer(VAddr buffer_vaddr, u32 size, u8 buffer_id) {
        Push(StaticBufferDesc(size, buffer_id));
        Push(buffer_vaddr);
    }

    void PushMappedBuffer(VAddr buffer_vaddr, u32 size, MappedBufferPermissions perms) {
        Push(MappedBufferDesc(size, perms));
        Push(buffer_vaddr);
    }
};

/// Push ///

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

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

template <>
inline void RequestBuilder::Push<ResultCode>(ResultCode value) {
    Push(value.raw);
}

class RequestParser : public RequestHelperBase {
public:
    RequestParser(u32* command_buffer, Header command_header)
        : RequestHelperBase(command_buffer, command_header) {}
    explicit RequestParser(u32* command_buffer, u32 command_header)
        : RequestParser(command_buffer, Header{command_header}) {}
    RequestParser(u32* command_buffer, u16 command_id, unsigned normal_params_size,
                  unsigned translate_params_size)
        : RequestParser(command_buffer,
                        MakeHeader(command_id, normal_params_size, translate_params_size)) {}

    RequestBuilder MakeBuilder(u32 normal_params_size, u32 translate_params_size,
                               bool validateHeader = true) {
        if (validateHeader)
            ValidateHeader();
        Header builderHeader{
            MakeHeader(header.command_id, normal_params_size, translate_params_size)};
        return {cmdbuf, builderHeader};
    }

    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);

    Kernel::Handle PopHandle();

    template <typename... H>
    void PopHandles(H&... handles);

    /**
     * @brief Pops the static buffer vaddr
     * @return                  The virtual address of the buffer
     * @param[out] data_size    If non-null, the pointed value will be set to the size of the data
     * @param[out] useStaticBuffersToGetVaddr Indicates if we should read the vaddr from the static
     * buffers (which is the correct thing to do, but no service presently implement it) instead of
     * using the same value as the process who sent the request
     * given by the source process
     *
     * Static buffers must be set up before any IPC request using those is sent.
     * It is the duty of the process (usually services) to allocate and set up the receiving static
     * buffer information
     * Please note that the setup uses virtual addresses.
     */
    VAddr PopStaticBuffer(size_t* data_size = nullptr, bool useStaticBuffersToGetVaddr = false);

    /**
     * @brief Pops the mapped buffer vaddr
     * @return                  The virtual address of the buffer
     * @param[out] data_size    If non-null, the pointed value will be set to the size of the data
     * given by the source process
     * @param[out] buffer_perms If non-null, the pointed value will be set to the permissions of the
     * buffer
     */
    VAddr PopMappedBuffer(size_t* data_size = nullptr,
                          MappedBufferPermissions* buffer_perms = nullptr);

    /**
     * @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);
};

/// Pop ///

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

template <>
inline u64 RequestParser::Pop<u64>() {
    const u64 lsw = Pop<u32>();
    const u64 msw = Pop<u32>();
    return msw << 32 | lsw;
}

template <>
inline ResultCode RequestParser::Pop<ResultCode>() {
    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...);
}

inline Kernel::Handle RequestParser::PopHandle() {
    const u32 handle_descriptor = Pop<u32>();
    DEBUG_ASSERT_MSG(IsHandleDescriptor(handle_descriptor),
                     "Tried to pop handle(s) but the descriptor is not a handle descriptor");
    DEBUG_ASSERT_MSG(HandleNumberFromDesc(handle_descriptor) == 1,
                     "Descriptor indicates that there isn't exactly one handle");
    return Pop<Kernel::Handle>();
}

template <typename... H>
void RequestParser::PopHandles(H&... handles) {
    const u32 handle_descriptor = Pop<u32>();
    const int handles_number = sizeof...(H);
    DEBUG_ASSERT_MSG(IsHandleDescriptor(handle_descriptor),
                     "Tried to pop handle(s) but the descriptor is not a handle descriptor");
    DEBUG_ASSERT_MSG(handles_number == HandleNumberFromDesc(handle_descriptor),
                     "Number of handles doesn't match the descriptor");
    Pop(static_cast<Kernel::Handle&>(handles)...);
}

inline VAddr RequestParser::PopStaticBuffer(size_t* data_size, bool useStaticBuffersToGetVaddr) {
    const u32 sbuffer_descriptor = Pop<u32>();
    StaticBufferDescInfo bufferInfo{sbuffer_descriptor};
    if (data_size != nullptr)
        *data_size = bufferInfo.size;
    if (!useStaticBuffersToGetVaddr)
        return Pop<VAddr>();
    else {
        ASSERT_MSG(0, "remove the assert if multiprocess/IPC translation are implemented.");
        // The buffer has already been copied to the static buffer by the kernel during
        // translation
        Pop<VAddr>(); // Pop the calling process buffer address
                      // and get the vaddr from the static buffers
        return cmdbuf[(0x100 >> 2) + bufferInfo.buffer_id * 2 + 1];
    }
}

inline VAddr RequestParser::PopMappedBuffer(size_t* data_size,
                                            MappedBufferPermissions* buffer_perms) {
    const u32 sbuffer_descriptor = Pop<u32>();
    MappedBufferDescInfo bufferInfo{sbuffer_descriptor};
    if (data_size != nullptr)
        *data_size = bufferInfo.size;
    if (buffer_perms != nullptr)
        *buffer_perms = bufferInfo.perms;
    return Pop<VAddr>();
}

template <typename T>
void RequestParser::PopRaw(T& value) {
    static_assert(std::is_trivially_copyable<T>(), "Raw types should be trivially copyable");
    std::memcpy(&value, cmdbuf + index, sizeof(T));
    index += (sizeof(T) + 3) / 4; // round up to word length
}

} // namespace IPC