1/* Copyright (c) 2013-2017 Jeffrey Pfau
  2 *
  3 * This Source Code Form is subject to the terms of the Mozilla Public
  4 * License, v. 2.0. If a copy of the MPL was not distributed with this
  5 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
  6#ifndef LR35902_DECODER_H
  7#define LR35902_DECODER_H
  8
  9#include <mgba-util/common.h>
 10
 11CXX_GUARD_START
 12
 13enum LR35902Condition {
 14	LR35902_COND_NONE = 0x0,
 15	LR35902_COND_C = 0x1,
 16	LR35902_COND_Z = 0x2,
 17	LR35902_COND_NC = 0x3,
 18	LR35902_COND_NZ = 0x4
 19};
 20
 21enum LR35902Mnemonic {
 22	LR35902_MN_ILL = 0,
 23	LR35902_MN_ADC,
 24	LR35902_MN_ADD,
 25	LR35902_MN_AND,
 26	LR35902_MN_BIT,
 27	LR35902_MN_CALL,
 28	LR35902_MN_CCF,
 29	LR35902_MN_CP,
 30	LR35902_MN_CPL,
 31	LR35902_MN_DAA,
 32	LR35902_MN_DEC,
 33	LR35902_MN_DI,
 34	LR35902_MN_EI,
 35	LR35902_MN_HALT,
 36	LR35902_MN_INC,
 37	LR35902_MN_JP,
 38	LR35902_MN_JR,
 39	LR35902_MN_LD,
 40	LR35902_MN_NOP,
 41	LR35902_MN_OR,
 42	LR35902_MN_POP,
 43	LR35902_MN_PUSH,
 44	LR35902_MN_RES,
 45	LR35902_MN_RET,
 46	LR35902_MN_RETI,
 47	LR35902_MN_RL,
 48	LR35902_MN_RLC,
 49	LR35902_MN_RR,
 50	LR35902_MN_RRC,
 51	LR35902_MN_RST,
 52	LR35902_MN_SBC,
 53	LR35902_MN_SCF,
 54	LR35902_MN_SET,
 55	LR35902_MN_SLA,
 56	LR35902_MN_SRA,
 57	LR35902_MN_SRL,
 58	LR35902_MN_STOP,
 59	LR35902_MN_SUB,
 60	LR35902_MN_SWAP,
 61	LR35902_MN_XOR,
 62
 63	LR35902_MN_MAX
 64};
 65
 66enum LR35902Register {
 67	LR35902_REG_B = 1,
 68	LR35902_REG_C,
 69	LR35902_REG_D,
 70	LR35902_REG_E,
 71	LR35902_REG_H,
 72	LR35902_REG_L,
 73	LR35902_REG_A,
 74	LR35902_REG_F,
 75	LR35902_REG_BC,
 76	LR35902_REG_DE,
 77	LR35902_REG_HL,
 78	LR35902_REG_AF,
 79
 80	LR35902_REG_SP,
 81	LR35902_REG_PC
 82};
 83
 84enum {
 85	LR35902_OP_FLAG_IMPLICIT = 1,
 86	LR35902_OP_FLAG_MEMORY = 2,
 87	LR35902_OP_FLAG_INCREMENT = 4,
 88	LR35902_OP_FLAG_DECREMENT = 8,
 89	LR35902_OP_FLAG_RELATIVE = 16,
 90};
 91
 92struct LR35902Operand {
 93	uint8_t reg;
 94	uint8_t flags;
 95	uint16_t immediate;
 96};
 97
 98struct LR35902InstructionInfo {
 99	uint8_t opcode[3];
100	uint8_t opcodeSize;
101	struct LR35902Operand op1;
102	struct LR35902Operand op2;
103	unsigned mnemonic;
104	unsigned condition;
105};
106
107size_t LR35902Decode(uint8_t opcode, struct LR35902InstructionInfo* info);
108int LR35902Disassemble(struct LR35902InstructionInfo* info, uint16_t pc, char* buffer, int blen);
109
110CXX_GUARD_END
111
112#endif