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/* ========================================================================
(C) Copyright 2023 by Molly Rocket, Inc., All Rights Reserved.
This software is provided 'as-is', without any express or implied
warranty. In no event will the authors be held liable for any damages
arising from the use of this software.
Please see https://computerenhance.com for more information
======================================================================== */
typedef u32 register_index;
// NOTE(casey): To make it easier to compile with languages which do not
// have auto-typedef'ing (like C, etc.), all types are manually typedef'd here.
typedef struct register_access register_access;
typedef struct effective_address_term effective_address_term;
typedef struct effective_address_expression effective_address_expression;
typedef struct immediate immediate;
typedef struct instruction_operand instruction_operand;
typedef struct instruction instruction;
typedef enum operation_type : u32
{
Op_None,
#define INST(Mnemonic, ...) Op_##Mnemonic,
#define INSTALT(...)
#include "sim86_instruction_table.inl"
Op_Count,
} operation_type;
enum instruction_flag
{
Inst_Lock = 0x1,
Inst_Rep = 0x2,
Inst_Segment = 0x4,
Inst_Wide = 0x8,
Inst_Far = 0x10,
Inst_RepNE = 0x20, // NOTE(casey): For user convenience, this will be set _in addition to_ Inst_Rep for REPNE/REPNZ
};
struct register_access
{
register_index Index;
u32 Offset;
u32 Count;
};
struct effective_address_term
{
register_access Register;
s32 Scale;
};
enum effective_address_flag
{
Address_ExplicitSegment = 0x1,
};
struct effective_address_expression
{
effective_address_term Terms[2];
u32 ExplicitSegment;
s32 Displacement;
u32 Flags;
};
enum immediate_flag
{
Immediate_RelativeJumpDisplacement = 0x1,
};
struct immediate
{
s32 Value;
u32 Flags;
};
typedef enum operand_type : u32
{
Operand_None,
Operand_Register,
Operand_Memory,
Operand_Immediate,
} operand_type;
struct instruction_operand
{
operand_type Type;
union
{
effective_address_expression Address;
register_access Register;
immediate Immediate;
};
};
struct instruction
{
u32 Address;
u32 Size;
operation_type Op;
u32 Flags;
instruction_operand Operands[2];
register_index SegmentOverride;
};
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