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Kernel/IPC: Handle the StaticBuffer descriptor in LLE command requests. 

This descriptor requires the target process to set up a "receive buffer" beforehand, where the input data will be written to when the descriptor is processed.
This commit is contained in:
Subv 2017-11-06 13:30:31 -05:00
parent d55a13c35d
commit 2d9e295e07
1 changed files with 36 additions and 2 deletions
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38
src/core/hle/kernel/ipc.cpp
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@ -17,6 +17,7 @@ ResultCode TranslateCommandBuffer(SharedPtr<Thread> src_thread, SharedPtr<Thread
VAddr src_address, VAddr dst_address) {
auto& src_process = src_thread->owner_process;
auto& dst_process = dst_thread->owner_process;
IPC::Header header;
// TODO(Subv): Replace by Memory::Read32 when possible.
@ -80,13 +81,46 @@ ResultCode TranslateCommandBuffer(SharedPtr<Thread> src_thread, SharedPtr<Thread
cmd_buf[i++] = src_process->process_id;
break;
}
case IPC::DescriptorType::StaticBuffer: {
IPC::StaticBufferDescInfo bufferInfo{descriptor};
VAddr static_buffer_src_address = cmd_buf[i];
std::vector<u8> data(bufferInfo.size);
Memory::ReadBlock(*src_process, static_buffer_src_address, data.data(), data.size());
// Grab the address that the target thread set up to receive the response static buffer
// and write our data there. The static buffers area is located right after the command
// buffer area.
struct StaticBuffer {
IPC::StaticBufferDescInfo descriptor;
VAddr address;
};
static_assert(sizeof(StaticBuffer) == 8, "StaticBuffer struct has incorrect size.");
StaticBuffer target_buffer;
u32 static_buffer_offset = IPC::COMMAND_BUFFER_LENGTH * sizeof(u32) +
sizeof(StaticBuffer) * bufferInfo.buffer_id;
Memory::ReadBlock(*dst_process, dst_address + static_buffer_offset, &target_buffer,
sizeof(target_buffer));
// Note: The real kernel doesn't seem to have any error recovery mechanisms for this
// case.
ASSERT_MSG(target_buffer.descriptor.size >= data.size(),
"Static buffer data is too big");
Memory::WriteBlock(*dst_process, target_buffer.address, data.data(), data.size());
cmd_buf[i++] = target_buffer.address;
break;
}
default:
UNIMPLEMENTED_MSG("Unsupported handle translation: 0x%08X", descriptor);
}
}
Memory::WriteBlock(*dst_thread->owner_process, dst_address, cmd_buf.data(),
command_size * sizeof(u32));
Memory::WriteBlock(*dst_process, dst_address, cmd_buf.data(), command_size * sizeof(u32));
return RESULT_SUCCESS;
}