From 8f2b642415a488064e214a1a6428fec422dd8374 Mon Sep 17 00:00:00 2001 From: Lectem Date: Mon, 26 Dec 2016 13:39:45 +0100 Subject: IPC helpers --- src/core/hle/ipc_helpers.h | 259 +++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 259 insertions(+) create mode 100644 src/core/hle/ipc_helpers.h (limited to 'src/core/hle/ipc_helpers.h') diff --git a/src/core/hle/ipc_helpers.h b/src/core/hle/ipc_helpers.h new file mode 100644 index 000000000..6089c39c7 --- /dev/null +++ b/src/core/hle/ipc_helpers.h @@ -0,0 +1,259 @@ +// 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); + } +}; + +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 + void Push(T value); + + template <> + void Push(u32); + + template + void Push(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 + void PushRaw(const T& value) { + static_assert(std::is_trivially_copyable(), "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 + void PushCopyHandles(H... handles) { + Push(CopyHandleDesc(sizeof...(H))); + Push(static_cast(handles)...); + } + + template + void PushMoveHandles(H... handles) { + Push(MoveHandleDesc(sizeof...(H))); + Push(static_cast(handles)...); + } + + void PushCurrentPIDHandle() { + Push(CallingPidDesc()); + Push(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); + } +}; + +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 + T Pop(); + + template <> + u32 Pop(); + + template + void Pop(T& value) { + value = Pop(); + } + + template + void Pop(First& first_value, Other&... other_values) { + first_value = Pop(); + Pop(other_values...); + } + + Kernel::Handle PopHandle() { + const u32 handle_descriptor = Pop(); + 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(); + } + + template + void PopHandles(H&... handles) { + const u32 handle_descriptor = Pop(); + 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(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) { + const u32 sbuffer_descriptor = Pop(); + StaticBufferDescInfo bufferInfo{sbuffer_descriptor}; + if (data_size != nullptr) + *data_size = bufferInfo.size; + if (!useStaticBuffersToGetVaddr) + return Pop(); + 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(); // Pop the calling process buffer address + // and get the vaddr from the static buffers + return cmdbuf[(0x100 >> 2) + bufferInfo.buffer_id * 2 + 1]; + } + } + + /** + * @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) { + const u32 sbuffer_descriptor = Pop(); + MappedBufferDescInfo bufferInfo{sbuffer_descriptor}; + if (data_size != nullptr) + *data_size = bufferInfo.size; + if (buffer_perms != nullptr) + *buffer_perms = bufferInfo.perms; + return Pop(); + } + + /** + * @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 + void PopRaw(T& value) { + static_assert(std::is_trivially_copyable(), "Raw types should be trivially copyable"); + std::memcpy(&value, cmdbuf + index, sizeof(T)); + index += (sizeof(T) + 3) / 4; // round up to word length + } +}; + +/// Pop /// + +template <> +inline u32 RequestParser::Pop() { + return cmdbuf[index++]; +} + +template <> +inline u64 RequestParser::Pop() { + const u64 lsw = Pop(); + const u64 msw = Pop(); + return msw << 32 | lsw; +} + +template <> +inline ResultCode RequestParser::Pop() { + return ResultCode{Pop()}; +} + +/// Push /// + +template <> +inline void RequestBuilder::Push(u32 value) { + cmdbuf[index++] = value; +} + +template <> +inline void RequestBuilder::Push(u64 value) { + Push(static_cast(value)); + Push(static_cast(value >> 32)); +} + +template <> +inline void RequestBuilder::Push(ResultCode value) { + Push(value.raw); +} + +} // namespace IPC -- cgit v1.2.3