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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 MODRM(mod, reg, rm) (((mod & 3) << 6) | ((reg & 7) << 3) | (rm & 3))
// MOD REG RM (r/m = register/memory)
// 1 1 | 1 0 1 | 1 0 1
// if mod == 0b11, then treat r/m as register,
// (examples in OP SRC DST ordering (same as the reg-rm order)
// gas/at&t ASM => op reg-idx reg-idx => MOD | REG | RM
// --------------------+----------------------+---------------------
// ie "xor %rcx, %rcx" => XOR 1 1 => 1 1 | 0 0 1 | 0 0 1
// ie "xor %rsi, %rbp" => XOR 6 5 => 1 1 | 1 0 1 | 1 1 0
//
// Other combinations of MOD means RM specifies an addressing mode.
// For 64bit systems:
//
#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 0xc3
#define RETN
#define SUB
#define XOR /*TODO*/
#define SYSCALL 0x0f, 0x05
#define REX(mode) (0b01000000 | mode)
#endif
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