-
Notifications
You must be signed in to change notification settings - Fork 1
Expand file tree
/
Copy pathassembler32.c
More file actions
171 lines (167 loc) · 7.04 KB
/
assembler32.c
File metadata and controls
171 lines (167 loc) · 7.04 KB
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
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <stdint.h>
#include <ctype.h>
#include "cpu32.h"
#include "opcodes32.h"
#include "instructions32.h"
int parse_register32(const char *str)
{
while(*str == ' ' || *str == '\t') str++;
char clean[16];
strncpy(clean, str, 15);
clean[15] = '\0';
char *comma = strchr(clean, ',');
if(comma) *comma = '\0';
int len = strlen(clean);
while(len > 0 && clean[len-1] <= ' ') clean[--len] = '\0';
if(clean[0] == 'r' || clean[0] == 'R') {
int reg = atoi(clean + 1);
if(reg >= 0 && reg <= 15) return reg;
}
return -1;
}
int parse_immediate32(const char *str)
{
while(*str == ' ' || *str == '\t') str++;
return atoi(str);
}
int assemble32(const char *source, uint32_t *output, int max_words)
{
char label_names[64][32];
uint32_t label_addresses[64];
int label_count = 0;
uint32_t address = 0;
int word_count = 0;
char *src = malloc(strlen(source) + 1);
strcpy(src, source);
char *line = strtok(src, "\n");
while(line) {
char *t = line;
while(*t == ' ' || *t == '\t') t++;
if(*t && *t != ';') {
char *colon = strchr(t, ':');
if(colon && colon[1] == '\0') {
*colon = '\0';
strncpy(label_names[label_count], t, 31);
label_names[label_count][31] = '\0';
label_addresses[label_count] = address;
label_count++;
} else {
char mn[16];
sscanf(t, "%15s", mn);
for(int i = 0; mn[i]; i++) mn[i] = toupper(mn[i]);
address += 4;
}
}
line = strtok(NULL, "\n");
}
free(src);
src = malloc(strlen(source) + 1);
strcpy(src, source);
line = strtok(src, "\n");
while(line && word_count < max_words) {
char *t = line;
while(*t == ' ' || *t == '\t') t++;
if(!*t || *t == ';' || strchr(t, ':')) {
line = strtok(NULL, "\n");
continue;
}
char mn[16], a1[32] = "", a2[32] = "";
sscanf(t, "%15s %31[^,],%31s", mn, a1, a2);
for(int i = 0; mn[i]; i++) mn[i] = toupper(mn[i]);
if(!strcmp(mn,"NOP"))
output[word_count++] = ENCODE_REG32(OP_NOP,0,0,0);
else if(!strcmp(mn,"HALT"))
output[word_count++] = ENCODE_REG32(OP_HALT,0,0,0);
else if(!strcmp(mn,"RET"))
output[word_count++] = ENCODE_REG32(OP_RET,0,0,0);
else if(!strcmp(mn,"STI"))
output[word_count++] = ENCODE_REG32(OP_STI,0,0,0);
else if(!strcmp(mn,"CLI"))
output[word_count++] = ENCODE_REG32(OP_CLI,0,0,0);
else if(!strcmp(mn,"IRET"))
output[word_count++] = ENCODE_REG32(OP_IRET,0,0,0);
else if(!strcmp(mn,"MOV"))
output[word_count++] = ENCODE_REG32(OP_MOV,parse_register32(a1),parse_register32(a2),0);
else if(!strcmp(mn,"ADD"))
output[word_count++] = ENCODE_REG32(OP_ADD,parse_register32(a1),parse_register32(a2),0);
else if(!strcmp(mn,"SUB"))
output[word_count++] = ENCODE_REG32(OP_SUB,parse_register32(a1),parse_register32(a2),0);
else if(!strcmp(mn,"AND"))
output[word_count++] = ENCODE_REG32(OP_AND,parse_register32(a1),parse_register32(a2),0);
else if(!strcmp(mn,"OR"))
output[word_count++] = ENCODE_REG32(OP_OR,parse_register32(a1),parse_register32(a2),0);
else if(!strcmp(mn,"XOR"))
output[word_count++] = ENCODE_REG32(OP_XOR,parse_register32(a1),parse_register32(a2),0);
else if(!strcmp(mn,"NOT"))
output[word_count++] = ENCODE_REG32(OP_NOT,parse_register32(a1),0,0);
else if(!strcmp(mn,"CMP"))
output[word_count++] = ENCODE_REG32(OP_CMP,parse_register32(a1),parse_register32(a2),0);
else if(!strcmp(mn,"MUL"))
output[word_count++] = ENCODE_REG32(OP_MUL,parse_register32(a1),parse_register32(a2),0);
else if(!strcmp(mn,"DIV"))
output[word_count++] = ENCODE_REG32(OP_DIV,parse_register32(a1),parse_register32(a2),0);
else if(!strcmp(mn,"MOD"))
output[word_count++] = ENCODE_REG32(OP_MOD,parse_register32(a1),parse_register32(a2),0);
else if(!strcmp(mn,"SHL"))
output[word_count++] = ENCODE_REG32(OP_SHL,parse_register32(a1),0,parse_immediate32(a2));
else if(!strcmp(mn,"SHR"))
output[word_count++] = ENCODE_REG32(OP_SHR,parse_register32(a1),0,parse_immediate32(a2));
else if(!strcmp(mn,"ROL"))
output[word_count++] = ENCODE_REG32(OP_ROL,parse_register32(a1),parse_register32(a2),0);
else if(!strcmp(mn,"ROR"))
output[word_count++] = ENCODE_REG32(OP_ROR,parse_register32(a1),parse_register32(a2),0);
else if(!strcmp(mn,"SWAP"))
output[word_count++] = ENCODE_REG32(OP_SWAP,parse_register32(a1),parse_register32(a2),0);
else if(!strcmp(mn,"LDR"))
output[word_count++] = ENCODE_REG32(OP_LDR,parse_register32(a1),parse_register32(a2),0);
else if(!strcmp(mn,"STR"))
output[word_count++] = ENCODE_REG32(OP_STR,parse_register32(a1),parse_register32(a2),0);
else if(!strcmp(mn,"LOAD"))
output[word_count++] = ENCODE_REG32(OP_LOAD,parse_register32(a1),0,parse_immediate32(a2));
else if(!strcmp(mn,"PUSH"))
output[word_count++] = ENCODE_REG32(OP_PUSH,0,parse_register32(a1),0);
else if(!strcmp(mn,"POP"))
output[word_count++] = ENCODE_REG32(OP_POP,parse_register32(a1),0,0);
else if(!strcmp(mn,"CALL")) {
uint32_t target = 0;
for(int i = 0; i < label_count; i++) {
if(!strcmp(a1, label_names[i])) {
target = label_addresses[i];
break;
}
}
output[word_count++] = ENCODE_JUMP32(OP_CALL, target);
}
else if(!strcmp(mn,"JMP") || !strcmp(mn,"JZ") || !strcmp(mn,"JNZ") ||
!strcmp(mn,"JN") || !strcmp(mn,"JGT") || !strcmp(mn,"JLT") ||
!strcmp(mn,"JGE") || !strcmp(mn,"JLE")) {
Opcode32 jump = !strcmp(mn,"JMP") ? OP_JMP :
!strcmp(mn,"JZ") ? OP_JZ :
!strcmp(mn,"JNZ") ? OP_JNZ :
!strcmp(mn,"JN") ? OP_JN :
!strcmp(mn,"JGT") ? OP_JGT :
!strcmp(mn,"JLT") ? OP_JLT :
!strcmp(mn,"JGE") ? OP_JGE : OP_JLE;
uint32_t target = 0;
int found = 0;
for(int i = 0; i < label_count; i++) {
if(!strcmp(a1, label_names[i])) {
target = label_addresses[i];
found = 1;
break;
}
}
if(!found && a1[0]) target = atoi(a1);
output[word_count++] = ENCODE_JUMP32(jump, target);
}
else {
fprintf(stderr, "Unknown instruction: %s\n", mn);
}
line = strtok(NULL, "\n");
}
free(src);
return word_count;
}