vmsvga: don't process more than 1024 fifo commands at once
[qemu.git] / target-microblaze / op_helper.c
1 /*
2 * Microblaze helper routines.
3 *
4 * Copyright (c) 2009 Edgar E. Iglesias <edgar.iglesias@gmail.com>.
5 * Copyright (c) 2009-2012 PetaLogix Qld Pty Ltd.
6 *
7 * This library is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2 of the License, or (at your option) any later version.
11 *
12 * This library is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
16 *
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with this library; if not, see <http://www.gnu.org/licenses/>.
19 */
20
21 #include "qemu/osdep.h"
22 #include "cpu.h"
23 #include "exec/helper-proto.h"
24 #include "qemu/host-utils.h"
25 #include "exec/exec-all.h"
26 #include "exec/cpu_ldst.h"
27
28 #define D(x)
29
30 #if !defined(CONFIG_USER_ONLY)
31
32 /* Try to fill the TLB and return an exception if error. If retaddr is
33 * NULL, it means that the function was called in C code (i.e. not
34 * from generated code or from helper.c)
35 */
36 void tlb_fill(CPUState *cs, target_ulong addr, int is_write, int mmu_idx,
37 uintptr_t retaddr)
38 {
39 int ret;
40
41 ret = mb_cpu_handle_mmu_fault(cs, addr, is_write, mmu_idx);
42 if (unlikely(ret)) {
43 if (retaddr) {
44 /* now we have a real cpu fault */
45 cpu_restore_state(cs, retaddr);
46 }
47 cpu_loop_exit(cs);
48 }
49 }
50 #endif
51
52 void helper_put(uint32_t id, uint32_t ctrl, uint32_t data)
53 {
54 int test = ctrl & STREAM_TEST;
55 int atomic = ctrl & STREAM_ATOMIC;
56 int control = ctrl & STREAM_CONTROL;
57 int nonblock = ctrl & STREAM_NONBLOCK;
58 int exception = ctrl & STREAM_EXCEPTION;
59
60 qemu_log_mask(LOG_UNIMP, "Unhandled stream put to stream-id=%d data=%x %s%s%s%s%s\n",
61 id, data,
62 test ? "t" : "",
63 nonblock ? "n" : "",
64 exception ? "e" : "",
65 control ? "c" : "",
66 atomic ? "a" : "");
67 }
68
69 uint32_t helper_get(uint32_t id, uint32_t ctrl)
70 {
71 int test = ctrl & STREAM_TEST;
72 int atomic = ctrl & STREAM_ATOMIC;
73 int control = ctrl & STREAM_CONTROL;
74 int nonblock = ctrl & STREAM_NONBLOCK;
75 int exception = ctrl & STREAM_EXCEPTION;
76
77 qemu_log_mask(LOG_UNIMP, "Unhandled stream get from stream-id=%d %s%s%s%s%s\n",
78 id,
79 test ? "t" : "",
80 nonblock ? "n" : "",
81 exception ? "e" : "",
82 control ? "c" : "",
83 atomic ? "a" : "");
84 return 0xdead0000 | id;
85 }
86
87 void helper_raise_exception(CPUMBState *env, uint32_t index)
88 {
89 CPUState *cs = CPU(mb_env_get_cpu(env));
90
91 cs->exception_index = index;
92 cpu_loop_exit(cs);
93 }
94
95 void helper_debug(CPUMBState *env)
96 {
97 int i;
98
99 qemu_log("PC=%8.8x\n", env->sregs[SR_PC]);
100 qemu_log("rmsr=%x resr=%x rear=%x debug[%x] imm=%x iflags=%x\n",
101 env->sregs[SR_MSR], env->sregs[SR_ESR], env->sregs[SR_EAR],
102 env->debug, env->imm, env->iflags);
103 qemu_log("btaken=%d btarget=%x mode=%s(saved=%s) eip=%d ie=%d\n",
104 env->btaken, env->btarget,
105 (env->sregs[SR_MSR] & MSR_UM) ? "user" : "kernel",
106 (env->sregs[SR_MSR] & MSR_UMS) ? "user" : "kernel",
107 (env->sregs[SR_MSR] & MSR_EIP),
108 (env->sregs[SR_MSR] & MSR_IE));
109 for (i = 0; i < 32; i++) {
110 qemu_log("r%2.2d=%8.8x ", i, env->regs[i]);
111 if ((i + 1) % 4 == 0)
112 qemu_log("\n");
113 }
114 qemu_log("\n\n");
115 }
116
117 static inline uint32_t compute_carry(uint32_t a, uint32_t b, uint32_t cin)
118 {
119 uint32_t cout = 0;
120
121 if ((b == ~0) && cin)
122 cout = 1;
123 else if ((~0 - a) < (b + cin))
124 cout = 1;
125 return cout;
126 }
127
128 uint32_t helper_cmp(uint32_t a, uint32_t b)
129 {
130 uint32_t t;
131
132 t = b + ~a + 1;
133 if ((b & 0x80000000) ^ (a & 0x80000000))
134 t = (t & 0x7fffffff) | (b & 0x80000000);
135 return t;
136 }
137
138 uint32_t helper_cmpu(uint32_t a, uint32_t b)
139 {
140 uint32_t t;
141
142 t = b + ~a + 1;
143 if ((b & 0x80000000) ^ (a & 0x80000000))
144 t = (t & 0x7fffffff) | (a & 0x80000000);
145 return t;
146 }
147
148 uint32_t helper_clz(uint32_t t0)
149 {
150 return clz32(t0);
151 }
152
153 uint32_t helper_carry(uint32_t a, uint32_t b, uint32_t cf)
154 {
155 return compute_carry(a, b, cf);
156 }
157
158 static inline int div_prepare(CPUMBState *env, uint32_t a, uint32_t b)
159 {
160 if (b == 0) {
161 env->sregs[SR_MSR] |= MSR_DZ;
162
163 if ((env->sregs[SR_MSR] & MSR_EE)
164 && !(env->pvr.regs[2] & PVR2_DIV_ZERO_EXC_MASK)) {
165 env->sregs[SR_ESR] = ESR_EC_DIVZERO;
166 helper_raise_exception(env, EXCP_HW_EXCP);
167 }
168 return 0;
169 }
170 env->sregs[SR_MSR] &= ~MSR_DZ;
171 return 1;
172 }
173
174 uint32_t helper_divs(CPUMBState *env, uint32_t a, uint32_t b)
175 {
176 if (!div_prepare(env, a, b)) {
177 return 0;
178 }
179 return (int32_t)a / (int32_t)b;
180 }
181
182 uint32_t helper_divu(CPUMBState *env, uint32_t a, uint32_t b)
183 {
184 if (!div_prepare(env, a, b)) {
185 return 0;
186 }
187 return a / b;
188 }
189
190 /* raise FPU exception. */
191 static void raise_fpu_exception(CPUMBState *env)
192 {
193 env->sregs[SR_ESR] = ESR_EC_FPU;
194 helper_raise_exception(env, EXCP_HW_EXCP);
195 }
196
197 static void update_fpu_flags(CPUMBState *env, int flags)
198 {
199 int raise = 0;
200
201 if (flags & float_flag_invalid) {
202 env->sregs[SR_FSR] |= FSR_IO;
203 raise = 1;
204 }
205 if (flags & float_flag_divbyzero) {
206 env->sregs[SR_FSR] |= FSR_DZ;
207 raise = 1;
208 }
209 if (flags & float_flag_overflow) {
210 env->sregs[SR_FSR] |= FSR_OF;
211 raise = 1;
212 }
213 if (flags & float_flag_underflow) {
214 env->sregs[SR_FSR] |= FSR_UF;
215 raise = 1;
216 }
217 if (raise
218 && (env->pvr.regs[2] & PVR2_FPU_EXC_MASK)
219 && (env->sregs[SR_MSR] & MSR_EE)) {
220 raise_fpu_exception(env);
221 }
222 }
223
224 uint32_t helper_fadd(CPUMBState *env, uint32_t a, uint32_t b)
225 {
226 CPU_FloatU fd, fa, fb;
227 int flags;
228
229 set_float_exception_flags(0, &env->fp_status);
230 fa.l = a;
231 fb.l = b;
232 fd.f = float32_add(fa.f, fb.f, &env->fp_status);
233
234 flags = get_float_exception_flags(&env->fp_status);
235 update_fpu_flags(env, flags);
236 return fd.l;
237 }
238
239 uint32_t helper_frsub(CPUMBState *env, uint32_t a, uint32_t b)
240 {
241 CPU_FloatU fd, fa, fb;
242 int flags;
243
244 set_float_exception_flags(0, &env->fp_status);
245 fa.l = a;
246 fb.l = b;
247 fd.f = float32_sub(fb.f, fa.f, &env->fp_status);
248 flags = get_float_exception_flags(&env->fp_status);
249 update_fpu_flags(env, flags);
250 return fd.l;
251 }
252
253 uint32_t helper_fmul(CPUMBState *env, uint32_t a, uint32_t b)
254 {
255 CPU_FloatU fd, fa, fb;
256 int flags;
257
258 set_float_exception_flags(0, &env->fp_status);
259 fa.l = a;
260 fb.l = b;
261 fd.f = float32_mul(fa.f, fb.f, &env->fp_status);
262 flags = get_float_exception_flags(&env->fp_status);
263 update_fpu_flags(env, flags);
264
265 return fd.l;
266 }
267
268 uint32_t helper_fdiv(CPUMBState *env, uint32_t a, uint32_t b)
269 {
270 CPU_FloatU fd, fa, fb;
271 int flags;
272
273 set_float_exception_flags(0, &env->fp_status);
274 fa.l = a;
275 fb.l = b;
276 fd.f = float32_div(fb.f, fa.f, &env->fp_status);
277 flags = get_float_exception_flags(&env->fp_status);
278 update_fpu_flags(env, flags);
279
280 return fd.l;
281 }
282
283 uint32_t helper_fcmp_un(CPUMBState *env, uint32_t a, uint32_t b)
284 {
285 CPU_FloatU fa, fb;
286 uint32_t r = 0;
287
288 fa.l = a;
289 fb.l = b;
290
291 if (float32_is_signaling_nan(fa.f) || float32_is_signaling_nan(fb.f)) {
292 update_fpu_flags(env, float_flag_invalid);
293 r = 1;
294 }
295
296 if (float32_is_quiet_nan(fa.f) || float32_is_quiet_nan(fb.f)) {
297 r = 1;
298 }
299
300 return r;
301 }
302
303 uint32_t helper_fcmp_lt(CPUMBState *env, uint32_t a, uint32_t b)
304 {
305 CPU_FloatU fa, fb;
306 int r;
307 int flags;
308
309 set_float_exception_flags(0, &env->fp_status);
310 fa.l = a;
311 fb.l = b;
312 r = float32_lt(fb.f, fa.f, &env->fp_status);
313 flags = get_float_exception_flags(&env->fp_status);
314 update_fpu_flags(env, flags & float_flag_invalid);
315
316 return r;
317 }
318
319 uint32_t helper_fcmp_eq(CPUMBState *env, uint32_t a, uint32_t b)
320 {
321 CPU_FloatU fa, fb;
322 int flags;
323 int r;
324
325 set_float_exception_flags(0, &env->fp_status);
326 fa.l = a;
327 fb.l = b;
328 r = float32_eq_quiet(fa.f, fb.f, &env->fp_status);
329 flags = get_float_exception_flags(&env->fp_status);
330 update_fpu_flags(env, flags & float_flag_invalid);
331
332 return r;
333 }
334
335 uint32_t helper_fcmp_le(CPUMBState *env, uint32_t a, uint32_t b)
336 {
337 CPU_FloatU fa, fb;
338 int flags;
339 int r;
340
341 fa.l = a;
342 fb.l = b;
343 set_float_exception_flags(0, &env->fp_status);
344 r = float32_le(fa.f, fb.f, &env->fp_status);
345 flags = get_float_exception_flags(&env->fp_status);
346 update_fpu_flags(env, flags & float_flag_invalid);
347
348
349 return r;
350 }
351
352 uint32_t helper_fcmp_gt(CPUMBState *env, uint32_t a, uint32_t b)
353 {
354 CPU_FloatU fa, fb;
355 int flags, r;
356
357 fa.l = a;
358 fb.l = b;
359 set_float_exception_flags(0, &env->fp_status);
360 r = float32_lt(fa.f, fb.f, &env->fp_status);
361 flags = get_float_exception_flags(&env->fp_status);
362 update_fpu_flags(env, flags & float_flag_invalid);
363 return r;
364 }
365
366 uint32_t helper_fcmp_ne(CPUMBState *env, uint32_t a, uint32_t b)
367 {
368 CPU_FloatU fa, fb;
369 int flags, r;
370
371 fa.l = a;
372 fb.l = b;
373 set_float_exception_flags(0, &env->fp_status);
374 r = !float32_eq_quiet(fa.f, fb.f, &env->fp_status);
375 flags = get_float_exception_flags(&env->fp_status);
376 update_fpu_flags(env, flags & float_flag_invalid);
377
378 return r;
379 }
380
381 uint32_t helper_fcmp_ge(CPUMBState *env, uint32_t a, uint32_t b)
382 {
383 CPU_FloatU fa, fb;
384 int flags, r;
385
386 fa.l = a;
387 fb.l = b;
388 set_float_exception_flags(0, &env->fp_status);
389 r = !float32_lt(fa.f, fb.f, &env->fp_status);
390 flags = get_float_exception_flags(&env->fp_status);
391 update_fpu_flags(env, flags & float_flag_invalid);
392
393 return r;
394 }
395
396 uint32_t helper_flt(CPUMBState *env, uint32_t a)
397 {
398 CPU_FloatU fd, fa;
399
400 fa.l = a;
401 fd.f = int32_to_float32(fa.l, &env->fp_status);
402 return fd.l;
403 }
404
405 uint32_t helper_fint(CPUMBState *env, uint32_t a)
406 {
407 CPU_FloatU fa;
408 uint32_t r;
409 int flags;
410
411 set_float_exception_flags(0, &env->fp_status);
412 fa.l = a;
413 r = float32_to_int32(fa.f, &env->fp_status);
414 flags = get_float_exception_flags(&env->fp_status);
415 update_fpu_flags(env, flags);
416
417 return r;
418 }
419
420 uint32_t helper_fsqrt(CPUMBState *env, uint32_t a)
421 {
422 CPU_FloatU fd, fa;
423 int flags;
424
425 set_float_exception_flags(0, &env->fp_status);
426 fa.l = a;
427 fd.l = float32_sqrt(fa.f, &env->fp_status);
428 flags = get_float_exception_flags(&env->fp_status);
429 update_fpu_flags(env, flags);
430
431 return fd.l;
432 }
433
434 uint32_t helper_pcmpbf(uint32_t a, uint32_t b)
435 {
436 unsigned int i;
437 uint32_t mask = 0xff000000;
438
439 for (i = 0; i < 4; i++) {
440 if ((a & mask) == (b & mask))
441 return i + 1;
442 mask >>= 8;
443 }
444 return 0;
445 }
446
447 void helper_memalign(CPUMBState *env, uint32_t addr, uint32_t dr, uint32_t wr,
448 uint32_t mask)
449 {
450 if (addr & mask) {
451 qemu_log_mask(CPU_LOG_INT,
452 "unaligned access addr=%x mask=%x, wr=%d dr=r%d\n",
453 addr, mask, wr, dr);
454 env->sregs[SR_EAR] = addr;
455 env->sregs[SR_ESR] = ESR_EC_UNALIGNED_DATA | (wr << 10) \
456 | (dr & 31) << 5;
457 if (mask == 3) {
458 env->sregs[SR_ESR] |= 1 << 11;
459 }
460 if (!(env->sregs[SR_MSR] & MSR_EE)) {
461 return;
462 }
463 helper_raise_exception(env, EXCP_HW_EXCP);
464 }
465 }
466
467 void helper_stackprot(CPUMBState *env, uint32_t addr)
468 {
469 if (addr < env->slr || addr > env->shr) {
470 qemu_log_mask(CPU_LOG_INT, "Stack protector violation at %x %x %x\n",
471 addr, env->slr, env->shr);
472 env->sregs[SR_EAR] = addr;
473 env->sregs[SR_ESR] = ESR_EC_STACKPROT;
474 helper_raise_exception(env, EXCP_HW_EXCP);
475 }
476 }
477
478 #if !defined(CONFIG_USER_ONLY)
479 /* Writes/reads to the MMU's special regs end up here. */
480 uint32_t helper_mmu_read(CPUMBState *env, uint32_t rn)
481 {
482 return mmu_read(env, rn);
483 }
484
485 void helper_mmu_write(CPUMBState *env, uint32_t rn, uint32_t v)
486 {
487 mmu_write(env, rn, v);
488 }
489
490 void mb_cpu_unassigned_access(CPUState *cs, hwaddr addr,
491 bool is_write, bool is_exec, int is_asi,
492 unsigned size)
493 {
494 MicroBlazeCPU *cpu;
495 CPUMBState *env;
496
497 qemu_log_mask(CPU_LOG_INT, "Unassigned " TARGET_FMT_plx " wr=%d exe=%d\n",
498 addr, is_write ? 1 : 0, is_exec ? 1 : 0);
499 if (cs == NULL) {
500 return;
501 }
502 cpu = MICROBLAZE_CPU(cs);
503 env = &cpu->env;
504 if (!(env->sregs[SR_MSR] & MSR_EE)) {
505 return;
506 }
507
508 env->sregs[SR_EAR] = addr;
509 if (is_exec) {
510 if ((env->pvr.regs[2] & PVR2_IOPB_BUS_EXC_MASK)) {
511 env->sregs[SR_ESR] = ESR_EC_INSN_BUS;
512 helper_raise_exception(env, EXCP_HW_EXCP);
513 }
514 } else {
515 if ((env->pvr.regs[2] & PVR2_DOPB_BUS_EXC_MASK)) {
516 env->sregs[SR_ESR] = ESR_EC_DATA_BUS;
517 helper_raise_exception(env, EXCP_HW_EXCP);
518 }
519 }
520 }
521 #endif