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IPC helpers

This commit is contained in:
Lectem 2016-12-26 13:39:45 +01:00
parent 51dd13b8a0
commit 8f2b642415
3 changed files with 323 additions and 48 deletions
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1
src/core/CMakeLists.txt
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@ -206,6 +206,7 @@ set(HEADERS
hle/config_mem.h
hle/function_wrappers.h
hle/ipc.h
hle/ipc_helpers.h
hle/applets/applet.h
hle/applets/erreula.h
hle/applets/mii_selector.h

111
src/core/hle/ipc.h
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@ -18,12 +18,26 @@ static const int kCommandHeaderOffset = 0x80; ///< Offset into command buffer of
* the thread's TLS to an intermediate buffer in kernel memory, and then copied again to
* the service handler process' memory.
* @param offset Optional offset into command buffer
* @param offset Optional offset into command buffer (in bytes)
* @return Pointer to command buffer
*/
inline u32* GetCommandBuffer(const int offset = 0) {
return (u32*)Memory::GetPointer(GetCurrentThread()->GetTLSAddress() + kCommandHeaderOffset +
offset);
}
static const int kStaticBuffersOffset =
0x100; ///< Offset into static buffers, relative to command buffer header
/**
* Returns a pointer to the static buffers area in the current thread's TLS
* TODO(Subv): cf. GetCommandBuffer
* @param offset Optional offset into static buffers area (in bytes)
* @return Pointer to static buffers area
*/
inline u32* GetStaticBuffers(const int offset = 0) {
return GetCommandBuffer(kStaticBuffersOffset + offset);
}
}
namespace IPC {
@ -40,35 +54,34 @@ enum DescriptorType : u32 {
CallingPid = 0x20,
};
/**
* @brief Creates a command header to be used for IPC
* @param command_id ID of the command to create a header for.
* @param normal_params Size of the normal parameters in words. Up to 63.
* @param translate_params_size Size of the translate parameters in words. Up to 63.
* @return The created IPC header.
*
* Normal parameters are sent directly to the process while the translate parameters might go
* through modifications and checks by the kernel.
* The translate parameters are described by headers generated with the IPC::*Desc functions.
*
* @note While #normal_params is equivalent to the number of normal parameters,
* #translate_params_size includes the size occupied by the translate parameters headers.
*/
constexpr u32 MakeHeader(u16 command_id, unsigned int normal_params,
unsigned int translate_params_size) {
return (u32(command_id) << 16) | ((u32(normal_params) & 0x3F) << 6) |
(u32(translate_params_size) & 0x3F);
}
union Header {
u32 raw;
BitField<0, 6, u32> translate_params_size;
BitField<6, 6, u32> normal_params;
BitField<6, 6, u32> normal_params_size;
BitField<16, 16, u32> command_id;
};
inline Header ParseHeader(u32 header) {
return {header};
/**
* @brief Creates a command header to be used for IPC
* @param command_id ID of the command to create a header for.
* @param normal_params_size Size of the normal parameters in words. Up to 63.
* @param translate_params_size Size of the translate parameters in words. Up to 63.
* @return The created IPC header.
*
* Normal parameters are sent directly to the process while the translate parameters might go
* through modifications and checks by the kernel.
* The translate parameters are described by headers generated with the IPC::*Desc functions.
*
* @note While #normal_params_size is equivalent to the number of normal parameters,
* #translate_params_size includes the size occupied by the translate parameters headers.
*/
inline u32 MakeHeader(u16 command_id, unsigned int normal_params_size,
unsigned int translate_params_size) {
Header header;
header.command_id.Assign(command_id);
header.normal_params_size.Assign(normal_params_size);
header.translate_params_size.Assign(translate_params_size);
return header.raw;
}
constexpr u32 MoveHandleDesc(u32 num_handles = 1) {
@ -83,7 +96,7 @@ constexpr u32 CallingPidDesc() {
return CallingPid;
}
constexpr bool isHandleDescriptor(u32 descriptor) {
constexpr bool IsHandleDescriptor(u32 descriptor) {
return (descriptor & 0xF) == 0x0;
}
@ -91,30 +104,31 @@ constexpr u32 HandleNumberFromDesc(u32 handle_descriptor) {
return (handle_descriptor >> 26) + 1;
}
constexpr u32 StaticBufferDesc(u32 size, u8 buffer_id) {
return StaticBuffer | (size << 14) | ((buffer_id & 0xF) << 10);
}
union StaticBufferDescInfo {
u32 raw;
BitField<0, 4, u32> descriptor_type;
BitField<10, 4, u32> buffer_id;
BitField<14, 18, u32> size;
};
inline StaticBufferDescInfo ParseStaticBufferDesc(const u32 desc) {
return {desc};
inline u32 StaticBufferDesc(u32 size, u8 buffer_id) {
StaticBufferDescInfo info;
info.descriptor_type.Assign(StaticBuffer);
info.buffer_id.Assign(buffer_id);
info.size.Assign(size);
return info.raw;
}
/**
* @brief Creates a header describing a buffer to be sent over PXI.
* @param size Size of the buffer. Max 0x00FFFFFF.
* @param buffer_id The Id of the buffer. Max 0xF.
* @param is_read_only true if the buffer is read-only. If false, the buffer is considered to have
* read-write access.
* @return The created PXI buffer header.
*
* The next value is a phys-address of a table located in the BASE memregion.
*/
* @brief Creates a header describing a buffer to be sent over PXI.
* @param size Size of the buffer. Max 0x00FFFFFF.
* @param buffer_id The Id of the buffer. Max 0xF.
* @param is_read_only true if the buffer is read-only. If false, the buffer is considered to have
* read-write access.
* @return The created PXI buffer header.
*
* The next value is a phys-address of a table located in the BASE memregion.
*/
inline u32 PXIBufferDesc(u32 size, unsigned buffer_id, bool is_read_only) {
u32 type = PXIBuffer;
if (is_read_only)
@ -122,29 +136,30 @@ inline u32 PXIBufferDesc(u32 size, unsigned buffer_id, bool is_read_only) {
return type | (size << 8) | ((buffer_id & 0xF) << 4);
}
enum MappedBufferPermissions {
enum MappedBufferPermissions : u32 {
R = 1,
W = 2,
RW = R | W,
};
constexpr u32 MappedBufferDesc(u32 size, MappedBufferPermissions perms) {
return MappedBuffer | (size << 4) | (u32(perms) << 1);
}
union MappedBufferDescInfo {
u32 raw;
BitField<4, 28, u32> size;
BitField<0, 4, u32> flags;
BitField<1, 2, MappedBufferPermissions> perms;
BitField<4, 28, u32> size;
};
inline MappedBufferDescInfo ParseMappedBufferDesc(const u32 desc) {
return {desc};
inline u32 MappedBufferDesc(u32 size, MappedBufferPermissions perms) {
MappedBufferDescInfo info;
info.flags.Assign(MappedBuffer);
info.perms.Assign(perms);
info.size.Assign(size);
return info.raw;
}
inline DescriptorType GetDescriptorType(u32 descriptor) {
// Note: Those checks must be done in this order
if (isHandleDescriptor(descriptor))
if (IsHandleDescriptor(descriptor))
return (DescriptorType)(descriptor & 0x30);
// handle the fact that the following descriptors can have rights

259
src/core/hle/ipc_helpers.h Normal file
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@ -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 <typename T>
void Push(T value);
template <>
void Push(u32);
template <typename First, class... Other>
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 <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);
}
};
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 <>
u32 Pop<u32>();
template <typename T>
void Pop(T& value) {
value = Pop<T>();
}
template <typename First, class... Other>
void Pop(First& first_value, Other&... other_values) {
first_value = Pop<First>();
Pop(other_values...);
}
Kernel::Handle 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 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)...);
}
/**
* @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<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];
}
}
/**
* @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<u32>();
MappedBufferDescInfo bufferInfo{sbuffer_descriptor};
if (data_size != nullptr)
*data_size = bufferInfo.size;
if (buffer_perms != nullptr)
*buffer_perms = bufferInfo.perms;
return Pop<VAddr>();
}
/**
* @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) {
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
}
};
/// 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>()};
}
/// Push ///
template <>
inline void RequestBuilder::Push<u32>(u32 value) {
cmdbuf[index++] = 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);
}
} // namespace IPC