-
Notifications
You must be signed in to change notification settings - Fork 0
/
Copy pathzpu.c
402 lines (385 loc) · 15.7 KB
/
zpu.c
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
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
/****************************************************************************
* Copyright (c) 2020 Mike Sharkey <mike@pikeaero.com>
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
* DEALINGS IN THE SOFTWARE.
****************************************************************************/
#include <zpu.h>
#include <zpu_mem.h>
#include <zpu_syscall.h>
#define ZPU_IM 128
#define ZPU_BREAKPOINT 0
#define ZPU_PUSHSP 2
#define ZPU_POPPC 4
#define ZPU_ADD 5
#define ZPU_AND 6
#define ZPU_OR 7
#define ZPU_LOAD 8
#define ZPU_NOT 9
#define ZPU_FLIP 10
#define ZPU_NOP 11
#define ZPU_STORE 12
#define ZPU_POPSP 13
#define ZPU_ADDSP 16
#define ZPU_EMULATE 32
#define ZPU_LOADH 34
#define ZPU_STOREH 35
#define ZPU_LESSTHAN 36
#define ZPU_LESSTHANOREQUAL 37
#define ZPU_ULESSTHAN 38
#define ZPU_ULESSTHANOREQUAL 39
#define ZPU_SWAP 40
#define ZPU_MULT 41
#define ZPU_LSHIFTRIGHT 42
#define ZPU_ASHIFTLEFT 43
#define ZPU_ASHIFTRIGHT 44
#define ZPU_CALL 45
#define ZPU_EQ 46
#define ZPU_NEQ 47
#define ZPU_NEG 48
#define ZPU_SUB 49
#define ZPU_XOR 50
#define ZPU_LOADB 51
#define ZPU_STOREB 52
#define ZPU_DIV 53
#define ZPU_MOD 54
#define ZPU_EQBRANCH 55
#define ZPU_NEQBRANCH 56
#define ZPU_POPPCREL 57
#define ZPU_CONFIG 58
#define ZPU_PUSHPC 59
#define ZPU_SYSCALL 60
#define ZPU_PUSHSPADD 61
#define ZPU_MULT16X16 62
#define ZPU_CALLPCREL 63
#define ZPU_STORESP 64
#define ZPU_LOADSP 96
#define VECTORSIZE 0x20
#define VECTOR_RESET 0
#define VECTOR_INTERRUPT 1
#define VECTORBASE 0x0
static void push(zpu_t* zpu,uint32_t data);
static uint32_t pop(zpu_t* zpu);
static void printRegs(zpu_t* zpu);
static uint32_t flip(uint32_t i);
void zpu_reset(zpu_t* zpu,uint32_t sp)
{
zpu_set_sp ( zpu, sp );
zpu_set_pc ( zpu, 0 );
zpu_set_tos ( zpu, 0 );
zpu->opcode = 0;
zpu->pc_dirty = true;
zpu->decode_mask = 0;
}
void zpu_execute(zpu_t* zpu)
{
for (;;)
{
zpu->pc_dirty = false;
zpu->opcode = zpu_mem_get_opcode( zpu_get_mem(zpu), zpu_get_pc(zpu) );
if ((zpu->opcode & 0x80) == ZPU_IM)
{
if (zpu->decode_mask)
{
zpu_set_tos(zpu,zpu_get_tos(zpu) << 7);
zpu_set_tos(zpu, zpu_get_tos(zpu) | (zpu->opcode & 0x7f) );
}
else
{
push(zpu,zpu_get_tos(zpu));
zpu_set_tos(zpu,zpu->opcode << 25);
zpu_set_tos(zpu,((int32_t)zpu_get_tos(zpu)) >> 25);
}
zpu->decode_mask = true;
}
else
{
zpu->decode_mask = false;
if ((zpu->opcode & 0xF0) == ZPU_ADDSP)
{
uint32_t addr;
addr = zpu->opcode & 0x0F;
addr = zpu_get_sp(zpu) + addr * 4;
// Handle case were addr is sp.
if (addr == zpu_get_sp(zpu))
zpu_set_tos(zpu,zpu_get_tos(zpu) + zpu_get_tos(zpu));
else
zpu_set_tos(zpu,zpu_get_tos(zpu) + zpu_mem_get_uint32( zpu_get_mem(zpu), addr));
}
else if ((zpu->opcode & 0xE0) == ZPU_LOADSP)
{
uint32_t addr;
addr = (zpu->opcode & 0x1F) ^ 0x10;
addr = zpu_get_sp(zpu) + 4 * addr;
push(zpu,zpu_get_tos(zpu));
zpu_set_tos(zpu,zpu_mem_get_uint32( zpu_get_mem(zpu), addr));
}
else if ((zpu->opcode & 0xE0) == ZPU_STORESP)
{
uint32_t addr;
addr = (zpu->opcode & 0x1F) ^ 0x10;
addr = zpu_get_sp(zpu) + 4 * addr;
zpu_mem_set_uint32( zpu_get_mem(zpu), addr, zpu_get_tos(zpu));
zpu_set_tos(zpu,pop(zpu));
}
else
{
switch (zpu->opcode)
{
case 0:
zpu_breakpoint_handler(zpu);
break;
case ZPU_PUSHPC:
push(zpu,zpu_get_tos(zpu));
zpu_set_tos(zpu,zpu_get_pc(zpu));
break;
case ZPU_OR:
zpu_set_nos(zpu,pop(zpu));
zpu_set_tos(zpu, zpu_get_tos(zpu) | zpu_get_nos(zpu) );
break;
case ZPU_NOT:
zpu_set_tos(zpu, ~zpu_get_tos(zpu) );
break;
case ZPU_LOAD:
zpu_set_tos(zpu, zpu_mem_get_uint32( zpu_get_mem(zpu), zpu_get_tos(zpu)) );
break;
case ZPU_PUSHSPADD:
zpu_set_tos(zpu,(zpu_get_tos(zpu) * 4) + zpu_get_sp(zpu));
break;
case ZPU_STORE:
zpu_set_nos(zpu,pop(zpu));
zpu_mem_set_uint32( zpu_get_mem(zpu), zpu_get_tos(zpu), zpu_get_nos(zpu));
zpu_set_tos(zpu,pop(zpu));
break;
case ZPU_POPPC:
zpu_set_pc(zpu,zpu_get_tos(zpu));
zpu_set_tos(zpu,pop(zpu));
zpu->pc_dirty = true;
break;
case ZPU_POPPCREL:
zpu_set_pc( zpu,zpu_get_pc(zpu) + zpu_get_tos(zpu) );
zpu_set_tos( zpu,pop(zpu) );
zpu->pc_dirty = true;
break;
case ZPU_FLIP:
zpu_set_tos( zpu, flip( zpu_get_tos(zpu) ) );
break;
case ZPU_ADD:
zpu_set_nos( zpu, pop(zpu) );
zpu_set_tos( zpu, zpu_get_tos(zpu) + zpu_get_nos(zpu) );
break;
case ZPU_SUB:
zpu_set_nos( zpu, pop( zpu ) );
zpu_set_tos( zpu, zpu_get_nos(zpu) - zpu_get_tos(zpu) );
break;
case ZPU_PUSHSP:
push( zpu, zpu_get_tos(zpu) );
zpu_set_tos( zpu, zpu_get_sp(zpu) + 4 );
break;
case ZPU_POPSP:
zpu_set_sp( zpu, zpu_get_tos(zpu) );
zpu_set_tos( zpu, zpu_mem_get_uint32( zpu_get_mem(zpu), zpu_get_sp(zpu)) );
break;
case ZPU_NOP:
break;
case ZPU_AND:
zpu_set_nos( zpu, pop( zpu ) );
zpu_set_tos( zpu, zpu_get_tos(zpu) & zpu_get_nos(zpu) );
break;
case ZPU_XOR:
zpu_set_nos( zpu, pop( zpu ) );
zpu_set_tos( zpu, zpu_get_tos(zpu) ^ zpu_get_nos(zpu) );
break;
case ZPU_LOADB:
zpu_set_tos( zpu,zpu_mem_get_uint8( zpu_get_mem(zpu), zpu_get_tos(zpu)) );
break;
case ZPU_STOREB:
zpu_set_nos( zpu, pop( zpu ) );
zpu_mem_set_uint8( zpu_get_mem(zpu), zpu_get_tos(zpu),zpu_get_nos(zpu));
zpu_set_tos( zpu, pop(zpu) );
break;
case ZPU_LOADH:
zpu_set_tos( zpu, zpu_mem_get_uint16( zpu_get_mem(zpu), zpu_get_tos(zpu)) );
break;
case ZPU_STOREH:
zpu_set_nos( zpu, pop(zpu) );
zpu_mem_set_uint16( zpu_get_mem(zpu), zpu_get_tos(zpu),zpu_get_nos(zpu));
zpu_set_tos( zpu, pop(zpu) );
break;
case ZPU_LESSTHAN:
zpu_set_nos( zpu, pop(zpu) );
zpu_set_tos( zpu, ((int32_t)zpu_get_tos(zpu) < (int32_t)zpu_get_nos(zpu)) ? 1 : 0 );
break;
case ZPU_LESSTHANOREQUAL:
zpu_set_nos( zpu, pop(zpu) );
zpu_set_tos( zpu, ((int32_t)zpu_get_tos(zpu) <= (int32_t)zpu_get_nos(zpu)) ? 1 :0 );
break;
case ZPU_ULESSTHAN:
zpu_set_nos( zpu, pop(zpu) );
zpu_set_tos( zpu, (zpu_get_tos(zpu) < (int32_t)zpu_get_nos(zpu)) ? 1 : 0 );
break;
case ZPU_ULESSTHANOREQUAL:
zpu_set_nos( zpu, pop(zpu) );
zpu_set_tos( zpu, (zpu_get_tos(zpu) <= (int32_t)zpu_get_nos(zpu)) ? 1 : 0 );
break;
case ZPU_SWAP:
zpu_set_tos( zpu, ((zpu_get_tos(zpu) >> 16) & 0xffff) | (zpu_get_tos(zpu) << 16) );
break;
case ZPU_MULT16X16:
zpu_set_nos( zpu, pop(zpu) );
zpu_set_tos( zpu, ((int32_t)zpu_get_nos(zpu) & 0xffff) * (zpu_get_tos(zpu) & 0xffff) );
break;
case ZPU_EQBRANCH:
zpu_set_nos( zpu, pop(zpu) );
if ((int32_t)zpu_get_nos(zpu) == 0)
{
zpu_set_pc(zpu,zpu_get_pc(zpu) + zpu_get_tos(zpu));
zpu->pc_dirty = true;
}
zpu_set_tos( zpu, pop(zpu) );
break;
case ZPU_NEQBRANCH:
zpu_set_nos( zpu, pop(zpu) );
if (zpu_get_nos(zpu) != 0)
{
zpu_set_pc(zpu,zpu_get_pc(zpu) + zpu_get_tos(zpu));
zpu->pc_dirty = true;
}
zpu_set_tos( zpu, pop(zpu) );
break;
case ZPU_MULT:
zpu_set_nos( zpu, pop(zpu) );
zpu_set_tos( zpu, (int32_t)zpu_get_tos(zpu) * (int32_t)zpu_get_nos(zpu) );
break;
case ZPU_DIV:
zpu_set_nos( zpu, pop(zpu) );
if (zpu_get_nos(zpu) == 0)
zpu_divzero_handler(zpu);
zpu_set_tos( zpu, (int32_t)zpu_get_tos(zpu) / (int32_t)zpu_get_nos(zpu) );
break;
case ZPU_MOD:
zpu_set_nos( zpu, pop(zpu) );
if (zpu_get_nos(zpu) == 0)
zpu_divzero_handler(zpu);
zpu_set_tos( zpu, (int32_t)zpu_get_tos(zpu) % (int32_t)zpu_get_nos(zpu) );
break;
case ZPU_LSHIFTRIGHT:
zpu_set_nos( zpu, pop(zpu) );
zpu_set_tos( zpu, zpu_get_nos(zpu) >> (zpu_get_tos(zpu) & 0x3f) );
break;
case ZPU_ASHIFTLEFT:
zpu_set_nos( zpu, pop(zpu) );
zpu_set_tos( zpu, zpu_get_nos(zpu) << (zpu_get_tos(zpu) & 0x3f) );
break;
case ZPU_ASHIFTRIGHT:
zpu_set_nos( zpu, pop(zpu) );
zpu_set_tos( zpu, zpu_get_nos(zpu) >> (zpu_get_tos(zpu) & 0x3f) );
break;
case ZPU_CALL:
zpu_set_nos( zpu, zpu_get_tos(zpu) );
zpu_set_tos( zpu, zpu_get_pc(zpu) + 1 );
zpu_set_pc( zpu, zpu_get_nos(zpu) );
zpu->pc_dirty = true;
break;
case ZPU_CALLPCREL:
zpu_set_nos( zpu, zpu_get_tos(zpu) );
zpu_set_tos( zpu, zpu_get_pc(zpu) + 1 );
zpu_set_pc( zpu, zpu_get_pc(zpu) + zpu_get_nos(zpu) );
zpu->pc_dirty = true;
break;
case ZPU_EQ:
zpu_set_nos( zpu, pop(zpu) );
if (zpu_get_nos(zpu) == zpu_get_tos(zpu))
zpu_set_tos( zpu, 1 );
else
zpu_set_tos( zpu, 0 );
break;
case ZPU_NEQ:
zpu_set_nos( zpu, pop(zpu) );
if (zpu_get_nos(zpu) != zpu_get_tos(zpu))
zpu_set_tos( zpu, 1 );
else
zpu_set_tos( zpu, 0 );
break;
case ZPU_NEG:
zpu_set_tos( zpu, -zpu_get_tos(zpu) );
break;
case ZPU_CONFIG:
zpu_set_cpu(zpu,zpu_get_tos(zpu));
zpu_set_tos( zpu, pop(zpu) );
zpu_config_handler(zpu);
break;
case ZPU_SYSCALL:
zpu_mem_set_uint32( zpu_get_mem(zpu), zpu_get_sp(zpu), zpu_get_tos(zpu));
zpu_syscall(zpu);
break;
default:
zpu_illegal_opcode_handler(zpu);
break;
}
}
}
if (!zpu->pc_dirty)
{
zpu_set_pc(zpu,zpu_get_pc(zpu) + 1);
zpu->pc_dirty = true;
}
}
}
static uint32_t pop(zpu_t* zpu)
{
zpu_inc_sp(zpu);
return zpu_mem_get_uint32( zpu_get_mem(zpu), zpu_get_sp(zpu));
}
static void push(zpu_t* zpu,uint32_t data)
{
zpu_mem_set_uint32( zpu_get_mem(zpu), zpu_get_sp(zpu), data);
zpu_dec_sp(zpu);
}
static uint32_t flip(uint32_t i)
{
uint32_t t = 0;
for (int j = 0; j < 32; j++)
{
t |= ((i >> j) & 1) << (31 - j);
}
return t;
}
void zpu_emulate(zpu_t* zpu)
{
push( zpu, zpu_get_tos(zpu) );
zpu_set_tos( zpu, zpu_get_pc(zpu) + 1 );
zpu_set_pc( zpu, ( zpu_mem_get_uint8( zpu_get_mem(zpu), zpu_get_pc(zpu) ) - 32) * VECTORSIZE + VECTORBASE);
zpu->pc_dirty = true;
}
void __attribute__((weak)) zpu_breakpoint_handler(zpu_t* zpu)
{
/* NOP*/
}
void __attribute__((weak)) zpu_divzero_handler(zpu_t* zpu)
{
/* NOP */
}
void __attribute__((weak)) zpu_config_handler(zpu_t* zpu)
{
/* NOP */
}
void __attribute__((weak)) zpu_illegal_opcode_handler(zpu_t* zpu)
{
/* NOP */
}