debug.c
6.3 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
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
//
// Created by imanol on 12/26/16.
//
#include <malloc.h>
#include <string.h>
#include "debug.h"
//uint32_t cycle_count = 0;
uint8_t breakpoint = 1;
uint16_t breakpoints[0xFF];
uint16_t nbpoints = 0;
char lastchoice = 0;
void load_state(char *filename)
{
FILE *state = fopen(filename,"r");
uint16_t regsdump[NUM_REGISTERS+1];
uint16_t memdump[MEMSIZE];
uint16_t *stackdump;
uint32_t stacksize, stackpos;
fread(regsdump,sizeof(uint16_t),NUM_REGISTERS+1,state);
fread(memdump,sizeof(uint16_t),MEMSIZE,state);
stackpos = ftell(state);
fseek(state,0,SEEK_END);
stacksize = (ftell(state) - stackpos)/sizeof(uint16_t);
stackdump = calloc(stacksize,sizeof(uint16_t));
fseek(state,stackpos,SEEK_SET);
fread(stackdump,sizeof(uint16_t),stacksize,state);
fclose(state);
load_regs(regsdump);
load_memory(memdump);
stack_load(stackdump,stacksize);
free(stackdump);
}
void save_state(char *filename)
{
FILE *state = fopen(filename,"w");
uint16_t regsdump[NUM_REGISTERS+1];
uint16_t memdump[MEMSIZE];
uint16_t *stackdump;
uint32_t stacksize;
dump_regs(regsdump);
dump_memory(memdump);
stacksize = stack_dump(&stackdump);
fwrite(regsdump,sizeof(uint16_t),NUM_REGISTERS+1,state);
fwrite(memdump,sizeof(uint16_t),MEMSIZE,state);
fwrite(stackdump,sizeof(uint16_t),stacksize,state);
fclose(state);
free(stackdump);
}
void query()
{
//TODO discard stdin
uint8_t end = 0;
uint16_t bpoint;
uint16_t mempos;
char input[100] = {0};
char filename[32];
uint8_t reg;
uint8_t value;
while(!end)
{
printf("\n> ");
char command = 0;
fgets(input,100,stdin);
command = input[0];
if (command != '\n')
{
lastchoice = command;
}
else
{
command = lastchoice;
}
switch (command)
{
case 'b':
sscanf(input,"b %d\n",&bpoint);
fprintf(stderr,"Set breakpoint %d to %d",nbpoints,bpoint);
breakpoints[nbpoints] = bpoint;
nbpoints = nbpoints + 1 % 0xFF;
break;
case 'd':
sscanf(input,"d %d\n",&bpoint);
fprintf(stderr,"Deleted breakpoint %d",bpoint);
breakpoints[bpoint] = 0;
break;
case 'c':
breakpoint = 0;
end = 1;
break;
case 'n':
end = 1;
break;
case 'r':
print_regs();
break;
case 'm':
sscanf(input,"m %d\n",&mempos);
fprintf(stderr,"%d: %02x\n",mempos,mem[mempos]);
break;
case 's':
sscanf(input,"s %s\n",filename);
save_state(filename);
fprintf(stderr,"Saved state as %s",filename);
break;
case 'l':
sscanf(input,"l %s\n",filename);
load_state(filename);
fprintf(stderr,"Loaded state as %s",filename);
break;
case 'w':
sscanf(input,"w %d %d\n",®,&value);
fprintf(stderr,"Setting register %d to %d",reg,value);
regs[reg] = value;
break;
default:
break;
}
}
}
uint8_t in_breakpoint(uint16_t pc)
{
uint8_t i;
for(i = 0; i < nbpoints; i++)
{
if(breakpoints[i] == pc)
{
return 1;
}
}
return 0;
}
uint16_t fetch_debug()
{
uint16_t value = mem[pc++];
/*if(breakpoint)
{
fprintf(stderr,"0x%2x (0x%2x): %d", pc, pc * sizeof(uint16_t),value);
fprintf(stderr," cycle: %d\n", cycle_count++);
}*/
return value;
}
void print_instruction(uint16_t opcode, uint16_t arg1, uint16_t arg2, uint16_t arg3)
{
switch(opcode)
{
case HALT:
printf("HALT\n");
break;
case MOV:
printf("MOV %d %d\n",arg1,arg2);
break;
case PUSH:
printf("PUSH %d\n",arg1);
break;
case POP:
printf("POP %d\n",arg1);
break;
case TEQ:
printf("TEQ %d %d %d\n",arg1,arg2,arg3);
break;
case TGT:
printf("TGT %d %d %d\n",arg1,arg2,arg3);
break;
case JMP:
printf("JMP %d\n",arg1);
break;
case JNZ:
printf("JNZ %d %d\n",arg1,arg2);
break;
case JZ:
printf("JZ %d %d\n",arg1,arg2);
break;
case ADD:
printf("ADD %d %d %d\n",arg1,arg2,arg3);
break;
case MUL:
printf("MUL %d %d %d\n",arg1,arg2,arg3);
break;
case MOD:
printf("MOD %d %d %d\n",arg1,arg2,arg3);
break;
case AND:
printf("AND %d %d %d\n",arg1,arg2,arg3);
break;
case OR:
printf("OR %d %d %d\n",arg1,arg2,arg3);
break;
case NOT:
printf("NOT %d %d\n",arg1,arg2);
break;
case LOAD:
printf("LOAD %d %d\n",arg1,arg2);
break;
case STOR:
printf("STOR %d %d\n",arg1,arg2);
break;
case CALL:
printf("CALL %d\n",arg1);
break;
case RET:
printf("RET\n");
break;
case OUT:
printf("OUT %d\n",arg1);
break;
case IN:
printf("IN %d\n",arg1);
break;
case NOP:
printf("NOP\n");
break;
default:
printf("UNK %d\n", opcode);
break;
}
}
void debug_program()
{
memset(breakpoints,0x00,0xFF);
uint16_t arg1;
uint16_t arg2;
uint16_t arg3;
for(;;)
{
if(in_breakpoint(pc) || breakpoint)
{
breakpoint = 1;
fprintf(stderr, "%d: ", pc);
print_instruction(mem[pc], mem[pc+1], mem[pc+2], mem[pc+3]);
query();
}
uint16_t opcode = fetch_debug();
decode_instruction(opcode, &arg1, &arg2, &arg3);
if (execute_instruction(opcode, arg1, arg2, arg3))
{
return;
}
}
}