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Start working on an isolation of 68000 instruction execution.

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This commit is contained in:
Thomas Harte 2022-04-28 15:35:40 -04:00
parent 8a18685902
commit bb73eb0db3
3 changed files with 121 additions and 2 deletions
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38
InstructionSets/M68k/Perform.hpp Normal file
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//
// Perform.hpp
// Clock Signal
//
// Created by Thomas Harte on 28/04/2022.
// Copyright © 2022 Thomas Harte. All rights reserved.
//
#ifndef InstructionSets_M68k_Perform_h
#define InstructionSets_M68k_Perform_h
#include "Model.hpp"
#include "Instruction.hpp"
#include "Status.hpp"
#include "../../Numeric/RegisterSizes.hpp"
namespace InstructionSet {
namespace M68k {
struct NullExceptionHandler {
void raise_exception(int) {}
void consume_cycles(int) {}
};
/// Performs @c op using @c source and @c dest (which mmay be ignored as per the semantics of the operation).
/// And change in provcessor status will be applied to @c status. If this operation raises an exception or consumes
/// additional cycles due to the particular value of the operands (on the 68000, think DIV or MUL), that'll be notified to
/// @c exception_handler.
template <
Operation op,
Model model,
typename ExceptionHandler
> void perform(CPU::RegisterPair32 &source, CPU::RegisterPair32 &dest, Status &status, ExceptionHandler &exception_handler);
}
}
#endif /* InstructionSets_M68k_Perform_h */

77
InstructionSets/M68k/Status.hpp Normal file
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//
// Status.hpp
// Clock Signal
//
// Created by Thomas Harte on 28/04/2022.
// Copyright © 2022 Thomas Harte. All rights reserved.
//
#ifndef InstructionSets_M68k_Status_h
#define InstructionSets_M68k_Status_h
namespace InstructionSet {
namespace M68k {
struct Status {
/* b15 */
uint_fast32_t trace_flag_ = 0; // The trace flag is set if this value is non-zero.
/* b13 */
int is_supervisor_ = 0; // 1 => processor is in supervisor mode; 0 => it isn't.
/* b7–b9 */
int interrupt_level_ = 0; // The direct integer value of thee current interrupt level.
/* b0–b4 */
uint_fast32_t zero_result_ = 0; // The zero flag is set if this value is zero.
uint_fast32_t carry_flag_ = 0; // The carry flag is set if this value is non-zero.
uint_fast32_t extend_flag_ = 0; // The extend flag is set if this value is non-zero.
uint_fast32_t overflow_flag_ = 0; // The overflow flag is set if this value is non-zero.
uint_fast32_t negative_flag_ = 0; // The negative flag is set if this value is non-zero.
/// Gets the current condition codes.
constexpr uint16_t ccr() const {
return
(carry_flag_ ? 0x0001 : 0x0000) |
(overflow_flag_ ? 0x0002 : 0x0000) |
(zero_result_ ? 0x0000 : 0x0004) |
(negative_flag_ ? 0x0008 : 0x0000) |
(extend_flag_ ? 0x0010 : 0x0000);
}
/// Gets the current value of the status register.
constexpr uint16_t status() const {
return uint16_t(
ccr() |
(interrupt_level_ << 8) |
(trace_flag_ ? 0x8000 : 0x0000) |
(is_supervisor_ << 13)
);
}
/// Sets the current condition codes.
constexpr void set_ccr(uint16_t ccr) {
carry_flag_ = (ccr) & 0x0001;
overflow_flag_ = (ccr) & 0x0002;
zero_result_ = ((ccr) & 0x0004) ^ 0x0004;
negative_flag_ = (ccr) & 0x0008;
extend_flag_ = (ccr) & 0x0010;
}
/// Sets the current value of the status register;
/// @returns @c true if the processor finishes in supervisor mode; @c false otherwise.
constexpr bool set_status(uint16_t status) {
set_ccr(status);
interrupt_level_ = (status >> 8) & 7;
trace_flag_ = status & 0x8000;
is_supervisor_ = (status >> 13) & 1;
return is_supervisor_;
}
};
}
}
#endif /* InstructionSets_M68k_Status_h */

8
OSBindings/Mac/Clock Signal.xcodeproj/project.pbxproj
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@ -1932,6 +1932,8 @@
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@ -3157,10 +3159,12 @@
4B79629B2819681F008130F9 /* M68k */ = {
isa = PBXGroup;
children = (
4B79629F2819681F008130F9 /* Decoder.cpp */,
4B79629E2819681F008130F9 /* Decoder.hpp */,
4B79629C2819681F008130F9 /* Instruction.hpp */,
4B79629D2819681F008130F9 /* Model.hpp */,
4B79629E2819681F008130F9 /* Decoder.hpp */,
4B79629F2819681F008130F9 /* Decoder.cpp */,
4BB5B996281B1E3F00522DA9 /* Perform.hpp */,
4BB5B997281B1F7B00522DA9 /* Status.hpp */,
);
path = M68k;
sourceTree = "<group>";