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
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
|
/* Copyright (C) 2023 Aryadev Chavali
* You may distribute and modify this code under the terms of the
* GPLv2 license. You should have received a copy of the GPLv2
* license with this file. If not, please write to:
* aryadev@aryadevchavali.com.
* Created: 2023-10-15
* Author: Aryadev Chavali
* Description: Virtual machine implementation
*/
#ifndef RUNTIME_H
#define RUNTIME_H
#include <stdio.h>
#include <stdlib.h>
#include "./base.h"
#include "./inst.h"
typedef enum
{
ERR_OK = 0,
ERR_STACK_UNDERFLOW,
ERR_STACK_OVERFLOW,
ERR_INVALID_OPCODE,
ERR_INVALID_REGISTER_BYTE,
ERR_INVALID_REGISTER_HWORD,
ERR_INVALID_REGISTER_WORD,
ERR_INVALID_PROGRAM_ADDRESS,
ERR_END_OF_PROGRAM,
} err_t;
const char *err_as_cstr(err_t);
#define VM_REGISTERS 8
typedef struct
{
struct Registers
{
word reg[VM_REGISTERS];
} registers;
struct Stack
{
byte *data;
word ptr, max;
} stack;
struct Program
{
inst_t *instructions;
word ptr, max;
} program;
} vm_t;
#define VM_REG_BYTE(REG) ((REG)&0b11111111)
#define VM_REG_HWORD(REG) ((REG)&0b11111111111111111111111111111111)
#define VM_REG_WORD(REG) ((REG))
err_t vm_execute(vm_t *);
err_t vm_execute_all(vm_t *);
void vm_load_stack(vm_t *, byte *, size_t);
void vm_load_program(vm_t *, inst_t *, size_t);
// Print routines
#define VM_PRINT_PROGRAM_EXCERPT 5
void vm_print_registers(vm_t *, FILE *);
void vm_print_stack(vm_t *, FILE *);
void vm_print_program(vm_t *, FILE *);
void vm_print_all(vm_t *, FILE *);
data_t vm_peek(vm_t *, data_type_t);
// Execution routines
err_t vm_push_byte(vm_t *, data_t);
err_t vm_push_hword(vm_t *, data_t);
err_t vm_push_word(vm_t *, data_t);
typedef err_t (*push_f)(vm_t *, data_t);
static const push_f PUSH_ROUTINES[] = {
[OP_PUSH_BYTE] = vm_push_byte,
[OP_PUSH_HWORD] = vm_push_hword,
[OP_PUSH_WORD] = vm_push_word,
};
err_t vm_push_byte_register(vm_t *, byte);
err_t vm_push_hword_register(vm_t *, byte);
err_t vm_push_word_register(vm_t *, byte);
typedef err_t (*push_reg_f)(vm_t *, byte);
static const push_reg_f PUSH_REG_ROUTINES[] = {
[OP_PUSH_REGISTER_BYTE] = vm_push_byte_register,
[OP_PUSH_REGISTER_HWORD] = vm_push_hword_register,
[OP_PUSH_REGISTER_WORD] = vm_push_word_register,
};
err_t vm_pop_byte(vm_t *, data_t *);
err_t vm_pop_hword(vm_t *, data_t *);
err_t vm_pop_word(vm_t *, data_t *);
err_t vm_mov_byte(vm_t *, byte);
err_t vm_mov_hword(vm_t *, byte);
err_t vm_mov_word(vm_t *, byte);
typedef err_t (*mov_f)(vm_t *, byte);
static const mov_f MOV_ROUTINES[] = {
[OP_MOV_BYTE] = vm_mov_byte,
[OP_MOV_HWORD] = vm_mov_hword,
[OP_MOV_WORD] = vm_mov_word,
};
err_t vm_dup_byte(vm_t *, word);
err_t vm_dup_hword(vm_t *, word);
err_t vm_dup_word(vm_t *, word);
typedef err_t (*dup_f)(vm_t *, word);
static const dup_f DUP_ROUTINES[] = {
[OP_DUP_BYTE] = vm_dup_byte,
[OP_DUP_HWORD] = vm_dup_hword,
[OP_DUP_WORD] = vm_dup_word,
};
err_t vm_not_byte(vm_t *);
err_t vm_not_hword(vm_t *);
err_t vm_not_word(vm_t *);
typedef err_t (*not_f)(vm_t *);
static const not_f NOT_ROUTINES[] = {
[OP_NOT_BYTE] = vm_not_byte,
[OP_NOT_HWORD] = vm_not_hword,
[OP_NOT_WORD] = vm_not_word,
};
err_t vm_or_byte(vm_t *);
err_t vm_or_hword(vm_t *);
err_t vm_or_word(vm_t *);
typedef err_t (*or_f)(vm_t *);
static const or_f OR_ROUTINES[] = {
[OP_OR_BYTE] = vm_or_byte,
[OP_OR_HWORD] = vm_or_hword,
[OP_OR_WORD] = vm_or_word,
};
err_t vm_and_byte(vm_t *);
err_t vm_and_hword(vm_t *);
err_t vm_and_word(vm_t *);
typedef err_t (*and_f)(vm_t *);
static const and_f AND_ROUTINES[] = {
[OP_AND_BYTE] = vm_and_byte,
[OP_AND_HWORD] = vm_and_hword,
[OP_AND_WORD] = vm_and_word,
};
err_t vm_xor_byte(vm_t *);
err_t vm_xor_hword(vm_t *);
err_t vm_xor_word(vm_t *);
typedef err_t (*xor_f)(vm_t *);
static const xor_f XOR_ROUTINES[] = {
[OP_XOR_BYTE] = vm_xor_byte,
[OP_XOR_HWORD] = vm_xor_hword,
[OP_XOR_WORD] = vm_xor_word,
};
err_t vm_eq_byte(vm_t *);
err_t vm_eq_hword(vm_t *);
err_t vm_eq_word(vm_t *);
typedef err_t (*eq_f)(vm_t *);
static const eq_f EQ_ROUTINES[] = {
[OP_EQ_BYTE] = vm_eq_byte,
[OP_EQ_HWORD] = vm_eq_hword,
[OP_EQ_WORD] = vm_eq_word,
};
#endif
|
