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#ifndef INSTRUCTIONS_H
#define INSTRUCTIONS_H
// Prefixes
// Prefix groups are mutually exclusive
// Prefix group 1
#define PREFIX_LOCK 0xf0
#define PREFIX_REPNE 0xf2
#define PREFIX_REPNZ PREFIX_REPNE
#define PREFIX_REP 0xf3
#define PREFIX_REPE PREFIX_REP
#define PREFIX_REPZ PREFIX_REP
// Prefix group 2
#define PREFIX_OVERRIDE_SEGMENT_CS 0x2e
#define PREFIX_OVERRIDE_SEGMENT_SS 0x36
#define PREFIX_OVERRIDE_SEGMENT_DS 0x3e
#define PREFIX_OVERRIDE_SEGMENT_ES 0x26
#define PREFIX_OVERRIDE_SEGMENT_FS 0x64
#define PREFIX_OVERRIDE_SEGMENT_GS 0x65
#define PREFIX_BRANCH_NOT_TAKEN PREFIX_OVERRIDE_SEGMENT_CS
#define PREFIX_BRANCH_TAKEN PREFIX_OVERRIDE_SEGMENT_DS
// Prefix group 3
#define PREFIX_OVERRIDE_OPSIZE 0x66
// Prefix group 4
#define PREFIX_OVERRIDE_ADDRESSSIZE 0x67
// Instructions
// Move double-word immediate
#define MOVBI(reg, imm) (0xb0 + reg), (imm & 0xff)
#define MOVWI(reg, imm) \
(0xb8 + reg), (imm & 0xff), ((imm >> 8) & 0xff), ((imm >> 16) & 0xff)
#define MOVDI(reg, imm) \
(0xb8 + reg), (imm & 0xff), ((imm >> 8) & 0xff), ((imm >> 16) & 0xff), \
((imm >> 24) & 0xff)
// TODO replace 0x48 with encoding,
// | 0 1 0 0 | W R X B |
//
// 0 1 0 0 -- fixed pattern
// W -- Set to use 64-bit operands,
// R -- extension to MODRM.reg field, registers
// X -- extension to SIB.index field, 64-bit addressing
// B -- extension to MODRM.rm or SIB.base field, 64-bit addressing
#define MOVABS(reg, imm) 0x48, MOVD(reg, imm)
#define MOVQ(reg, imm) 0x48, 89 c8
#define ADD
#define CALL
#define CMP
#define DEC
#define DIV
#define HLT
#define IDIV
#define IMUL
#define INC
#define INT
#define INTO
#define IRET
#define JNZ
#define JMP
#define LEA
#define POP
#define PUSH
#define RET
#define RETN
#define SUB
#define XOR
#define SYSCALL 0x0f, 0x05
#define REX(mode) (0b01000000 | mode)
#endif
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