352 lines
11 KiB
C++
352 lines
11 KiB
C++
// Copyright 2018 yuzu Emulator Project
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// Licensed under GPLv2 or any later version
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// Refer to the license.txt file included.
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#include "common/assert.h"
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#include "common/logging/log.h"
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#include "common/microprofile.h"
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#include "video_core/engines/maxwell_3d.h"
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#include "video_core/macro_interpreter.h"
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MICROPROFILE_DEFINE(MacroInterp, "GPU", "Execute macro interpreter", MP_RGB(128, 128, 192));
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namespace Tegra {
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namespace {
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enum class Operation : u32 {
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ALU = 0,
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AddImmediate = 1,
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ExtractInsert = 2,
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ExtractShiftLeftImmediate = 3,
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ExtractShiftLeftRegister = 4,
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Read = 5,
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Unused = 6, // This operation doesn't seem to be a valid encoding.
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Branch = 7,
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};
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} // Anonymous namespace
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enum class MacroInterpreter::ALUOperation : u32 {
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Add = 0,
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AddWithCarry = 1,
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Subtract = 2,
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SubtractWithBorrow = 3,
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// Operations 4-7 don't seem to be valid encodings.
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Xor = 8,
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Or = 9,
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And = 10,
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AndNot = 11,
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Nand = 12
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};
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enum class MacroInterpreter::ResultOperation : u32 {
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IgnoreAndFetch = 0,
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Move = 1,
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MoveAndSetMethod = 2,
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FetchAndSend = 3,
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MoveAndSend = 4,
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FetchAndSetMethod = 5,
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MoveAndSetMethodFetchAndSend = 6,
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MoveAndSetMethodSend = 7
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};
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enum class MacroInterpreter::BranchCondition : u32 {
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Zero = 0,
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NotZero = 1,
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};
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union MacroInterpreter::Opcode {
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u32 raw;
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BitField<0, 3, Operation> operation;
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BitField<4, 3, ResultOperation> result_operation;
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BitField<4, 1, BranchCondition> branch_condition;
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// If set on a branch, then the branch doesn't have a delay slot.
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BitField<5, 1, u32> branch_annul;
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BitField<7, 1, u32> is_exit;
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BitField<8, 3, u32> dst;
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BitField<11, 3, u32> src_a;
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BitField<14, 3, u32> src_b;
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// The signed immediate overlaps the second source operand and the alu operation.
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BitField<14, 18, s32> immediate;
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BitField<17, 5, ALUOperation> alu_operation;
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// Bitfield instructions data
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BitField<17, 5, u32> bf_src_bit;
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BitField<22, 5, u32> bf_size;
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BitField<27, 5, u32> bf_dst_bit;
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u32 GetBitfieldMask() const {
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return (1 << bf_size) - 1;
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}
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s32 GetBranchTarget() const {
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return static_cast<s32>(immediate * sizeof(u32));
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}
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};
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MacroInterpreter::MacroInterpreter(Engines::Maxwell3D& maxwell3d) : maxwell3d(maxwell3d) {}
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void MacroInterpreter::Execute(u32 offset, std::size_t num_parameters, const u32* parameters) {
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MICROPROFILE_SCOPE(MacroInterp);
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Reset();
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registers[1] = parameters[0];
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if (num_parameters > parameters_capacity) {
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parameters_capacity = num_parameters;
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this->parameters = std::make_unique<u32[]>(num_parameters);
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}
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std::memcpy(this->parameters.get(), parameters, num_parameters * sizeof(u32));
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this->num_parameters = num_parameters;
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// Execute the code until we hit an exit condition.
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bool keep_executing = true;
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while (keep_executing) {
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keep_executing = Step(offset, false);
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}
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// Assert the the macro used all the input parameters
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ASSERT(next_parameter_index == num_parameters);
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}
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void MacroInterpreter::Reset() {
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registers = {};
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pc = 0;
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delayed_pc = {};
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method_address.raw = 0;
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num_parameters = 0;
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// The next parameter index starts at 1, because $r1 already has the value of the first
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// parameter.
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next_parameter_index = 1;
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carry_flag = false;
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}
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bool MacroInterpreter::Step(u32 offset, bool is_delay_slot) {
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u32 base_address = pc;
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Opcode opcode = GetOpcode(offset);
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pc += 4;
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// Update the program counter if we were delayed
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if (delayed_pc) {
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ASSERT(is_delay_slot);
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pc = *delayed_pc;
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delayed_pc = {};
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}
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switch (opcode.operation) {
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case Operation::ALU: {
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u32 result = GetALUResult(opcode.alu_operation, GetRegister(opcode.src_a),
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GetRegister(opcode.src_b));
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ProcessResult(opcode.result_operation, opcode.dst, result);
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break;
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}
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case Operation::AddImmediate: {
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ProcessResult(opcode.result_operation, opcode.dst,
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GetRegister(opcode.src_a) + opcode.immediate);
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break;
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}
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case Operation::ExtractInsert: {
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u32 dst = GetRegister(opcode.src_a);
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u32 src = GetRegister(opcode.src_b);
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src = (src >> opcode.bf_src_bit) & opcode.GetBitfieldMask();
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dst &= ~(opcode.GetBitfieldMask() << opcode.bf_dst_bit);
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dst |= src << opcode.bf_dst_bit;
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ProcessResult(opcode.result_operation, opcode.dst, dst);
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break;
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}
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case Operation::ExtractShiftLeftImmediate: {
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u32 dst = GetRegister(opcode.src_a);
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u32 src = GetRegister(opcode.src_b);
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u32 result = ((src >> dst) & opcode.GetBitfieldMask()) << opcode.bf_dst_bit;
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ProcessResult(opcode.result_operation, opcode.dst, result);
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break;
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}
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case Operation::ExtractShiftLeftRegister: {
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u32 dst = GetRegister(opcode.src_a);
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u32 src = GetRegister(opcode.src_b);
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u32 result = ((src >> opcode.bf_src_bit) & opcode.GetBitfieldMask()) << dst;
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ProcessResult(opcode.result_operation, opcode.dst, result);
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break;
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}
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case Operation::Read: {
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u32 result = Read(GetRegister(opcode.src_a) + opcode.immediate);
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ProcessResult(opcode.result_operation, opcode.dst, result);
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break;
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}
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case Operation::Branch: {
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ASSERT_MSG(!is_delay_slot, "Executing a branch in a delay slot is not valid");
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u32 value = GetRegister(opcode.src_a);
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bool taken = EvaluateBranchCondition(opcode.branch_condition, value);
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if (taken) {
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// Ignore the delay slot if the branch has the annul bit.
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if (opcode.branch_annul) {
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pc = base_address + opcode.GetBranchTarget();
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return true;
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}
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delayed_pc = base_address + opcode.GetBranchTarget();
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// Execute one more instruction due to the delay slot.
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return Step(offset, true);
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}
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break;
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}
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default:
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UNIMPLEMENTED_MSG("Unimplemented macro operation {}",
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static_cast<u32>(opcode.operation.Value()));
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}
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// An instruction with the Exit flag will not actually
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// cause an exit if it's executed inside a delay slot.
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if (opcode.is_exit && !is_delay_slot) {
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// Exit has a delay slot, execute the next instruction
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Step(offset, true);
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return false;
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}
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return true;
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}
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MacroInterpreter::Opcode MacroInterpreter::GetOpcode(u32 offset) const {
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const auto& macro_memory{maxwell3d.GetMacroMemory()};
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ASSERT((pc % sizeof(u32)) == 0);
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ASSERT((pc + offset) < macro_memory.size() * sizeof(u32));
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return {macro_memory[offset + pc / sizeof(u32)]};
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}
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u32 MacroInterpreter::GetALUResult(ALUOperation operation, u32 src_a, u32 src_b) {
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switch (operation) {
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case ALUOperation::Add: {
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const u64 result{static_cast<u64>(src_a) + src_b};
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carry_flag = result > 0xffffffff;
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return static_cast<u32>(result);
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}
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case ALUOperation::AddWithCarry: {
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const u64 result{static_cast<u64>(src_a) + src_b + (carry_flag ? 1ULL : 0ULL)};
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carry_flag = result > 0xffffffff;
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return static_cast<u32>(result);
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}
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case ALUOperation::Subtract: {
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const u64 result{static_cast<u64>(src_a) - src_b};
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carry_flag = result < 0x100000000;
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return static_cast<u32>(result);
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}
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case ALUOperation::SubtractWithBorrow: {
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const u64 result{static_cast<u64>(src_a) - src_b - (carry_flag ? 0ULL : 1ULL)};
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carry_flag = result < 0x100000000;
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return static_cast<u32>(result);
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}
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case ALUOperation::Xor:
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return src_a ^ src_b;
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case ALUOperation::Or:
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return src_a | src_b;
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case ALUOperation::And:
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return src_a & src_b;
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case ALUOperation::AndNot:
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return src_a & ~src_b;
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case ALUOperation::Nand:
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return ~(src_a & src_b);
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default:
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UNIMPLEMENTED_MSG("Unimplemented ALU operation {}", static_cast<u32>(operation));
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return 0;
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}
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}
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void MacroInterpreter::ProcessResult(ResultOperation operation, u32 reg, u32 result) {
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switch (operation) {
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case ResultOperation::IgnoreAndFetch:
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// Fetch parameter and ignore result.
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SetRegister(reg, FetchParameter());
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break;
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case ResultOperation::Move:
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// Move result.
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SetRegister(reg, result);
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break;
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case ResultOperation::MoveAndSetMethod:
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// Move result and use as Method Address.
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SetRegister(reg, result);
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SetMethodAddress(result);
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break;
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case ResultOperation::FetchAndSend:
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// Fetch parameter and send result.
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SetRegister(reg, FetchParameter());
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Send(result);
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break;
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case ResultOperation::MoveAndSend:
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// Move and send result.
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SetRegister(reg, result);
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Send(result);
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break;
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case ResultOperation::FetchAndSetMethod:
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// Fetch parameter and use result as Method Address.
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SetRegister(reg, FetchParameter());
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SetMethodAddress(result);
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break;
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case ResultOperation::MoveAndSetMethodFetchAndSend:
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// Move result and use as Method Address, then fetch and send parameter.
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SetRegister(reg, result);
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SetMethodAddress(result);
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Send(FetchParameter());
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break;
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case ResultOperation::MoveAndSetMethodSend:
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// Move result and use as Method Address, then send bits 12:17 of result.
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SetRegister(reg, result);
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SetMethodAddress(result);
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Send((result >> 12) & 0b111111);
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break;
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default:
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UNIMPLEMENTED_MSG("Unimplemented result operation {}", static_cast<u32>(operation));
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}
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}
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u32 MacroInterpreter::FetchParameter() {
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ASSERT(next_parameter_index < num_parameters);
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return parameters[next_parameter_index++];
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}
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u32 MacroInterpreter::GetRegister(u32 register_id) const {
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return registers.at(register_id);
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}
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void MacroInterpreter::SetRegister(u32 register_id, u32 value) {
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// Register 0 is hardwired as the zero register.
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// Ensure no writes to it actually occur.
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if (register_id == 0) {
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return;
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}
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registers.at(register_id) = value;
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}
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void MacroInterpreter::SetMethodAddress(u32 address) {
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method_address.raw = address;
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}
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void MacroInterpreter::Send(u32 value) {
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maxwell3d.CallMethodFromMME({method_address.address, value});
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// Increment the method address by the method increment.
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method_address.address.Assign(method_address.address.Value() +
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method_address.increment.Value());
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}
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u32 MacroInterpreter::Read(u32 method) const {
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return maxwell3d.GetRegisterValue(method);
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}
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bool MacroInterpreter::EvaluateBranchCondition(BranchCondition cond, u32 value) const {
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switch (cond) {
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case BranchCondition::Zero:
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return value == 0;
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case BranchCondition::NotZero:
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return value != 0;
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}
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UNREACHABLE();
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return true;
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}
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} // namespace Tegra
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