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/* date = May 13th 2025 11:06 pm */
#ifndef SIM8086_H
#define SIM8086_H
typedef uint64_t u64;
typedef uint32_t u32;
typedef uint16_t u16;
typedef uint8_t u8;
typedef int64_t s64;
typedef int32_t s32;
typedef int16_t s16;
typedef int8_t s8;
typedef s32 b32;
typedef float r32;
typedef double r64;
#define false 0
#define true 1
#define global_variable static
#define internal static
#define local_persist static
struct instruction_byte
{
// NOTE(luca): All byte positions are 1-based so that 0 can mean that you do not have to test for this byte.
u8 Op;
u8 OpMask;
u8 SubOpMask;
u8 WBitAt;
u8 SBitAt;
u8 DBitAt;
u8 VBitAt;
u8 ModBitsAt;
u8 RegBitsAt;
u8 RMBitsAt;
};
struct sub_instruction
{
u8 Op;
char *Name;
};
struct instruction
{
char *Name;
char *Description;
u32 OperandsCount;
b32 HasSegmentRegister;
b32 HasImmediate;
b32 HasAddress;
b32 IsByteJump;
b32 ToAccumulator;
b32 FlipOperands;
u32 BytesCount;
instruction_byte Bytes[8];
// NOTE(luca): Sub instructions are instructions which do the same work but can have different names depending on a second opcode.
u32 SubInstructionsCount;
sub_instruction SubInstructions[8];
};
struct instruction_table
{
instruction *Instructions;
u32 Count;
u32 Size;
};
#endif //SIM8086_H
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