1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
|
// license:BSD-3-Clause
// copyright-holders:Olivier Galibert
// NEC disassembler interface
#ifndef MAME_CPU_NEC_NECDASM_H
#define MAME_CPU_NEC_NECDASM_H
#pragma once
class nec_disassembler : public util::disasm_interface
{
public:
nec_disassembler(const u8 *decryption_table = nullptr);
virtual ~nec_disassembler() = default;
virtual u32 opcode_alignment() const override;
virtual offs_t disassemble(std::ostream &stream, offs_t pc, const data_buffer &opcodes, const data_buffer ¶ms) override;
private:
enum
{
PARAM_REG8 = 1, /* 8-bit register */
PARAM_REG16, /* 16-bit register */
PARAM_REG2_8, /* 8-bit register */
PARAM_REG2_16, /* 16-bit register */
PARAM_RM8, /* 8-bit memory or register */
PARAM_RM16, /* 16-bit memory or register */
PARAM_RMPTR8, /* 8-bit memory or register */
PARAM_RMPTR16, /* 16-bit memory or register */
PARAM_I3, /* 3-bit immediate */
PARAM_I4, /* 4-bit immediate */
PARAM_I8, /* 8-bit signed immediate */
PARAM_I16, /* 16-bit signed immediate */
PARAM_UI8, /* 8-bit unsigned immediate */
PARAM_IMM, /* 16-bit immediate */
PARAM_ADDR, /* 16:16 address */
PARAM_REL8, /* 8-bit PC-relative displacement */
PARAM_REL16, /* 16-bit PC-relative displacement */
PARAM_MEM_OFFS, /* 16-bit mem offset */
PARAM_SREG, /* segment register */
PARAM_SFREG, /* V25/V35 special function register */
PARAM_1, /* used by shift/rotate instructions */
PARAM_AL,
PARAM_CL,
PARAM_DL,
PARAM_BL,
PARAM_AH,
PARAM_CH,
PARAM_DH,
PARAM_BH,
PARAM_AW,
PARAM_CW,
PARAM_DW,
PARAM_BW,
PARAM_SP,
PARAM_BP,
PARAM_IX,
PARAM_IY
};
enum
{
MODRM = 1,
GROUP,
FPU,
TWO_BYTE,
PREFIX,
SEG_PS,
SEG_DS0,
SEG_DS1,
SEG_SS
};
struct NEC_I386_OPCODE {
char mnemonic[32];
uint32_t flags;
uint32_t param1;
uint32_t param2;
uint32_t param3;
offs_t dasm_flags;
};
struct NEC_GROUP_OP {
char mnemonic[32];
const NEC_I386_OPCODE *opcode;
};
static const NEC_I386_OPCODE necv_opcode_table1[256];
static const NEC_I386_OPCODE necv_opcode_table2[256];
static const NEC_I386_OPCODE immb_table[8];
static const NEC_I386_OPCODE immw_table[8];
static const NEC_I386_OPCODE immws_table[8];
static const NEC_I386_OPCODE shiftbi_table[8];
static const NEC_I386_OPCODE shiftwi_table[8];
static const NEC_I386_OPCODE shiftb_table[8];
static const NEC_I386_OPCODE shiftw_table[8];
static const NEC_I386_OPCODE shiftbv_table[8];
static const NEC_I386_OPCODE shiftwv_table[8];
static const NEC_I386_OPCODE group1b_table[8];
static const NEC_I386_OPCODE group1w_table[8];
static const NEC_I386_OPCODE group2b_table[8];
static const NEC_I386_OPCODE group2w_table[8];
static const NEC_GROUP_OP group_op_table[];
static const char *const nec_reg[8];
static const char *const nec_reg8[8];
static const char *const nec_sreg[8];
static const char *const nec_sfreg[256];
const u8 *m_decryption_table;
u8 m_modrm;
u32 m_segment;
offs_t m_dasm_flags;
std::string m_modrm_string;
inline u8 FETCH(offs_t pc_base, offs_t &pc, const data_buffer &opcodes);
inline u16 FETCH16(offs_t pc_base, offs_t &pc, const data_buffer &opcodes);
std::string hexstring(uint32_t value, int digits);
std::string shexstring(uint32_t value, int digits, bool always);
void handle_modrm(offs_t pc_base, offs_t &pc, const data_buffer ¶ms);
void handle_param(std::ostream &stream, uint32_t param, offs_t pc_base, offs_t &pc, const data_buffer ¶ms);
void handle_fpu(std::ostream &stream, uint8_t op1, uint8_t op2, offs_t pc_base, offs_t &pc, const data_buffer ¶ms);
void decode_opcode(std::ostream &stream, const NEC_I386_OPCODE *op, uint8_t op1, offs_t pc_base, offs_t &pc, const data_buffer &opcodes, const data_buffer ¶ms);
};
#endif
|