mirror of
https://github.com/TomHarte/CLK.git
synced 2024-11-11 14:05:21 +00:00
341 lines
12 KiB
C++
341 lines
12 KiB
C++
//
|
|
// State.cpp
|
|
// Clock Signal
|
|
//
|
|
// Created by Thomas Harte on 14/05/2020.
|
|
// Copyright © 2020 Thomas Harte. All rights reserved.
|
|
//
|
|
|
|
#include "State.hpp"
|
|
|
|
#include <cassert>
|
|
|
|
using namespace CPU::MC68000;
|
|
|
|
State::State(const ProcessorBase &src): State() {
|
|
// Registers.
|
|
for(int c = 0; c < 7; ++c) {
|
|
registers.address[c] = src.address_[c].full;
|
|
registers.data[c] = src.data_[c].full;
|
|
}
|
|
registers.data[7] = src.data_[7].full;
|
|
registers.user_stack_pointer = src.is_supervisor_ ? src.stack_pointers_[0].full : src.address_[7].full;
|
|
registers.supervisor_stack_pointer = src.is_supervisor_ ? src.address_[7].full : src.stack_pointers_[1].full;
|
|
registers.status = src.get_status();
|
|
registers.program_counter = src.program_counter_.full;
|
|
registers.prefetch = src.prefetch_queue_.full;
|
|
registers.instruction = src.decoded_instruction_.full;
|
|
|
|
// Inputs.
|
|
inputs.bus_interrupt_level = uint8_t(src.bus_interrupt_level_);
|
|
inputs.dtack = src.dtack_;
|
|
inputs.is_peripheral_address = src.is_peripheral_address_;
|
|
inputs.bus_error = src.bus_error_;
|
|
inputs.bus_request = src.bus_request_;
|
|
inputs.bus_grant = false; // TODO (within the 68000).
|
|
inputs.halt = src.halt_;
|
|
|
|
// Execution state.
|
|
execution_state.e_clock_phase = src.e_clock_phase_.as<uint8_t>();
|
|
execution_state.effective_address[0] = src.effective_address_[0].full;
|
|
execution_state.effective_address[1] = src.effective_address_[1].full;
|
|
execution_state.source_data = src.source_bus_data_.full;
|
|
execution_state.destination_data = src.destination_bus_data_.full;
|
|
execution_state.last_trace_flag = src.last_trace_flag_;
|
|
execution_state.next_word = src.next_word_;
|
|
execution_state.dbcc_false_address = src.dbcc_false_address_;
|
|
execution_state.is_starting_interrupt = src.is_starting_interrupt_;
|
|
execution_state.pending_interrupt_level = uint8_t(src.pending_interrupt_level_);
|
|
execution_state.accepted_interrupt_level = uint8_t(src.accepted_interrupt_level_);
|
|
execution_state.movem_final_address = src.movem_final_address_;
|
|
|
|
static_assert(sizeof(execution_state.source_addresses) == sizeof(src.precomputed_addresses_));
|
|
memcpy(&execution_state.source_addresses, &src.precomputed_addresses_, sizeof(src.precomputed_addresses_));
|
|
|
|
// This is collapsed to a Boolean; if there is an active program then it's the
|
|
// one implied by the current instruction.
|
|
execution_state.active_program = src.active_program_;
|
|
|
|
// Slightly dodgy assumption here: the Phase enum will always exactly track
|
|
// the 68000's ExecutionState enum.
|
|
execution_state.phase = ExecutionState::Phase(src.execution_state_);
|
|
|
|
auto contained_by = [](const auto *source, const auto *reference) -> bool {
|
|
while(true) {
|
|
if(source == reference) return true;
|
|
if(source->is_terminal()) return false;
|
|
++source;
|
|
}
|
|
};
|
|
|
|
// Store enough information to relocate the MicroOp.
|
|
const ProcessorBase::MicroOp *micro_op_base = nullptr;
|
|
if(src.active_program_) {
|
|
micro_op_base = &src.all_micro_ops_[src.instructions[src.decoded_instruction_.full].micro_operations];
|
|
assert(contained_by(micro_op_base, src.active_micro_op_));
|
|
execution_state.micro_op_source = ExecutionState::MicroOpSource::ActiveProgram;
|
|
} else {
|
|
if(contained_by(src.long_exception_micro_ops_, src.active_micro_op_)) {
|
|
execution_state.micro_op_source = ExecutionState::MicroOpSource::LongException;
|
|
micro_op_base = src.long_exception_micro_ops_;
|
|
} else if(contained_by(src.short_exception_micro_ops_, src.active_micro_op_)) {
|
|
execution_state.micro_op_source = ExecutionState::MicroOpSource::ShortException;
|
|
micro_op_base = src.short_exception_micro_ops_;
|
|
} else if(contained_by(src.interrupt_micro_ops_, src.active_micro_op_)) {
|
|
execution_state.micro_op_source = ExecutionState::MicroOpSource::Interrupt;
|
|
micro_op_base = src.interrupt_micro_ops_;
|
|
} else {
|
|
assert(false);
|
|
}
|
|
}
|
|
execution_state.micro_op = uint8_t(src.active_micro_op_ - micro_op_base);
|
|
|
|
// Encode the BusStep.
|
|
struct BusStepOption {
|
|
const ProcessorBase::BusStep *const base;
|
|
const ExecutionState::BusStepSource source = ExecutionState::BusStepSource::FollowMicroOp;
|
|
};
|
|
BusStepOption bus_step_options[] = {
|
|
{
|
|
src.reset_bus_steps_,
|
|
ExecutionState::BusStepSource::Reset
|
|
},
|
|
{
|
|
src.branch_taken_bus_steps_,
|
|
ExecutionState::BusStepSource::BranchTaken
|
|
},
|
|
{
|
|
src.branch_byte_not_taken_bus_steps_,
|
|
ExecutionState::BusStepSource::BranchByteNotTaken
|
|
},
|
|
{
|
|
src.branch_word_not_taken_bus_steps_,
|
|
ExecutionState::BusStepSource::BranchWordNotTaken
|
|
},
|
|
{
|
|
src.bsr_bus_steps_,
|
|
ExecutionState::BusStepSource::BSR
|
|
},
|
|
{
|
|
src.dbcc_condition_true_steps_,
|
|
ExecutionState::BusStepSource::DBccConditionTrue
|
|
},
|
|
{
|
|
src.dbcc_condition_false_no_branch_steps_,
|
|
ExecutionState::BusStepSource::DBccConditionFalseNoBranch
|
|
},
|
|
{
|
|
src.dbcc_condition_false_branch_steps_,
|
|
ExecutionState::BusStepSource::DBccConditionFalseBranch
|
|
},
|
|
{
|
|
src.movem_read_steps_,
|
|
ExecutionState::BusStepSource::MovemRead
|
|
},
|
|
{
|
|
src.movem_write_steps_,
|
|
ExecutionState::BusStepSource::MovemWrite
|
|
},
|
|
{
|
|
src.trap_steps_,
|
|
ExecutionState::BusStepSource::Trap
|
|
},
|
|
{
|
|
src.bus_error_steps_,
|
|
ExecutionState::BusStepSource::BusError
|
|
},
|
|
{
|
|
&src.all_bus_steps_[src.active_micro_op_->bus_program],
|
|
ExecutionState::BusStepSource::FollowMicroOp
|
|
},
|
|
{nullptr}
|
|
};
|
|
const BusStepOption *bus_step_option = bus_step_options;
|
|
const ProcessorBase::BusStep *bus_step_base = nullptr;
|
|
while(bus_step_option->base) {
|
|
if(contained_by(bus_step_option->base, src.active_step_)) {
|
|
bus_step_base = bus_step_option->base;
|
|
execution_state.bus_step_source = bus_step_option->source;
|
|
break;
|
|
}
|
|
++bus_step_option;
|
|
}
|
|
assert(bus_step_base);
|
|
execution_state.bus_step = uint8_t(src.active_step_ - bus_step_base);
|
|
}
|
|
|
|
void State::apply(ProcessorBase &target) {
|
|
// Registers.
|
|
for(int c = 0; c < 7; ++c) {
|
|
target.address_[c].full = registers.address[c];
|
|
target.data_[c].full = registers.data[c];
|
|
}
|
|
target.data_[7].full = registers.data[7];
|
|
target.stack_pointers_[0] = registers.user_stack_pointer;
|
|
target.stack_pointers_[1] = registers.supervisor_stack_pointer;
|
|
target.address_[7] = target.stack_pointers_[(registers.status & 0x2000) >> 13];
|
|
target.set_status(registers.status);
|
|
target.program_counter_.full = registers.program_counter;
|
|
target.prefetch_queue_.full = registers.prefetch;
|
|
target.decoded_instruction_.full = registers.instruction;
|
|
|
|
// Inputs.
|
|
target.bus_interrupt_level_ = inputs.bus_interrupt_level;
|
|
target.dtack_ = inputs.dtack;
|
|
target.is_peripheral_address_ = inputs.is_peripheral_address;
|
|
target.bus_error_ = inputs.bus_error;
|
|
target.bus_request_ = inputs.bus_request;
|
|
// TODO: bus_grant.
|
|
target.halt_ = inputs.halt;
|
|
|
|
// Execution state.
|
|
target.e_clock_phase_ = HalfCycles(execution_state.e_clock_phase);
|
|
target.effective_address_[0].full = execution_state.effective_address[0];
|
|
target.effective_address_[1].full = execution_state.effective_address[1];
|
|
target.source_bus_data_.full = execution_state.source_data;
|
|
target.destination_bus_data_.full = execution_state.destination_data;
|
|
target.last_trace_flag_ = execution_state.last_trace_flag;
|
|
target.next_word_ = execution_state.next_word;
|
|
target.dbcc_false_address_ = execution_state.dbcc_false_address;
|
|
target.is_starting_interrupt_ = execution_state.is_starting_interrupt;
|
|
target.pending_interrupt_level_ = execution_state.pending_interrupt_level;
|
|
target.accepted_interrupt_level_ = execution_state.accepted_interrupt_level;
|
|
target.movem_final_address_ = execution_state.movem_final_address;
|
|
|
|
static_assert(sizeof(execution_state.source_addresses) == sizeof(target.precomputed_addresses_));
|
|
memcpy(&target.precomputed_addresses_, &execution_state.source_addresses, sizeof(target.precomputed_addresses_));
|
|
|
|
// See above; this flag indicates whether to populate the field.
|
|
target.active_program_ =
|
|
execution_state.active_program ?
|
|
&target.instructions[target.decoded_instruction_.full] : nullptr;
|
|
|
|
// Dodgy assumption duplicated here from above.
|
|
target.execution_state_ = CPU::MC68000::ProcessorStorage::ExecutionState(execution_state.phase);
|
|
|
|
// Decode the MicroOp.
|
|
switch(execution_state.micro_op_source) {
|
|
case ExecutionState::MicroOpSource::ActiveProgram:
|
|
target.active_micro_op_ = &target.all_micro_ops_[target.active_program_->micro_operations];
|
|
break;
|
|
case ExecutionState::MicroOpSource::LongException:
|
|
target.active_micro_op_ = target.long_exception_micro_ops_;
|
|
break;
|
|
case ExecutionState::MicroOpSource::ShortException:
|
|
target.active_micro_op_ = target.short_exception_micro_ops_;
|
|
break;
|
|
case ExecutionState::MicroOpSource::Interrupt:
|
|
target.active_micro_op_ = target.interrupt_micro_ops_;
|
|
break;
|
|
}
|
|
target.active_micro_op_ += execution_state.micro_op;
|
|
|
|
|
|
// Decode the BusStep.
|
|
switch(execution_state.bus_step_source) {
|
|
case ExecutionState::BusStepSource::Reset:
|
|
target.active_step_ = target.reset_bus_steps_;
|
|
break;
|
|
case ExecutionState::BusStepSource::BranchTaken:
|
|
target.active_step_ = target.branch_taken_bus_steps_;
|
|
break;
|
|
case ExecutionState::BusStepSource::BranchByteNotTaken:
|
|
target.active_step_ = target.branch_byte_not_taken_bus_steps_;
|
|
break;
|
|
case ExecutionState::BusStepSource::BranchWordNotTaken:
|
|
target.active_step_ = target.branch_word_not_taken_bus_steps_;
|
|
break;
|
|
case ExecutionState::BusStepSource::BSR:
|
|
target.active_step_ = target.bsr_bus_steps_;
|
|
break;
|
|
case ExecutionState::BusStepSource::DBccConditionTrue:
|
|
target.active_step_ = target.dbcc_condition_true_steps_;
|
|
break;
|
|
case ExecutionState::BusStepSource::DBccConditionFalseNoBranch:
|
|
target.active_step_ = target.dbcc_condition_false_no_branch_steps_;
|
|
break;
|
|
case ExecutionState::BusStepSource::DBccConditionFalseBranch:
|
|
target.active_step_ = target.dbcc_condition_false_branch_steps_;
|
|
break;
|
|
case ExecutionState::BusStepSource::MovemRead:
|
|
target.active_step_ = target.movem_read_steps_;
|
|
break;
|
|
case ExecutionState::BusStepSource::MovemWrite:
|
|
target.active_step_ = target.movem_write_steps_;
|
|
break;
|
|
case ExecutionState::BusStepSource::Trap:
|
|
target.active_step_ = target.trap_steps_;
|
|
break;
|
|
case ExecutionState::BusStepSource::BusError:
|
|
target.active_step_ = target.bus_error_steps_;
|
|
break;
|
|
case ExecutionState::BusStepSource::FollowMicroOp:
|
|
target.active_step_ = &target.all_bus_steps_[target.active_micro_op_->bus_program];
|
|
break;
|
|
}
|
|
target.active_step_ += execution_state.bus_step;
|
|
}
|
|
|
|
// Boilerplate follows here, to establish 'reflection'.
|
|
State::State() {
|
|
if(needs_declare()) {
|
|
DeclareField(registers);
|
|
DeclareField(execution_state);
|
|
DeclareField(inputs);
|
|
}
|
|
}
|
|
|
|
State::Registers::Registers() {
|
|
if(needs_declare()) {
|
|
DeclareField(data);
|
|
DeclareField(address);
|
|
DeclareField(user_stack_pointer);
|
|
DeclareField(supervisor_stack_pointer);
|
|
DeclareField(status);
|
|
DeclareField(program_counter);
|
|
DeclareField(prefetch);
|
|
DeclareField(instruction);
|
|
}
|
|
}
|
|
|
|
State::Inputs::Inputs() {
|
|
if(needs_declare()) {
|
|
DeclareField(bus_interrupt_level);
|
|
DeclareField(dtack);
|
|
DeclareField(is_peripheral_address);
|
|
DeclareField(bus_error);
|
|
DeclareField(bus_request);
|
|
DeclareField(bus_grant);
|
|
DeclareField(halt);
|
|
}
|
|
}
|
|
|
|
State::ExecutionState::ExecutionState() {
|
|
if(needs_declare()) {
|
|
DeclareField(e_clock_phase);
|
|
DeclareField(effective_address);
|
|
DeclareField(source_data);
|
|
DeclareField(destination_data);
|
|
DeclareField(last_trace_flag);
|
|
DeclareField(next_word);
|
|
DeclareField(dbcc_false_address);
|
|
DeclareField(is_starting_interrupt);
|
|
DeclareField(pending_interrupt_level);
|
|
DeclareField(accepted_interrupt_level);
|
|
DeclareField(active_program);
|
|
DeclareField(movem_final_address);
|
|
DeclareField(source_addresses);
|
|
|
|
AnnounceEnum(Phase);
|
|
DeclareField(phase);
|
|
|
|
AnnounceEnum(MicroOpSource);
|
|
DeclareField(micro_op_source);
|
|
DeclareField(micro_op);
|
|
|
|
AnnounceEnum(BusStepSource);
|
|
DeclareField(bus_step_source);
|
|
DeclareField(bus_step);
|
|
}
|
|
}
|