David 'Digit' Turner | 23ca2ae | 2011-06-01 16:14:53 +0200 | [diff] [blame] | 1 | /* |
| 2 | * QEMU System Emulator |
| 3 | * |
| 4 | * Copyright (c) 2003-2008 Fabrice Bellard |
| 5 | * |
| 6 | * Permission is hereby granted, free of charge, to any person obtaining a copy |
| 7 | * of this software and associated documentation files (the "Software"), to deal |
| 8 | * in the Software without restriction, including without limitation the rights |
| 9 | * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell |
| 10 | * copies of the Software, and to permit persons to whom the Software is |
| 11 | * furnished to do so, subject to the following conditions: |
| 12 | * |
| 13 | * The above copyright notice and this permission notice shall be included in |
| 14 | * all copies or substantial portions of the Software. |
| 15 | * |
| 16 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
| 17 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
| 18 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL |
| 19 | * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
| 20 | * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, |
| 21 | * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN |
| 22 | * THE SOFTWARE. |
| 23 | */ |
| 24 | #include "config-host.h" |
| 25 | |
David 'Digit' Turner | 6af6765 | 2013-12-14 23:49:32 +0100 | [diff] [blame] | 26 | #include "monitor/monitor.h" |
David 'Digit' Turner | 34c48ff | 2013-12-15 00:25:03 +0100 | [diff] [blame] | 27 | #include "sysemu/sysemu.h" |
David 'Digit' Turner | 852088c | 2013-12-14 23:04:12 +0100 | [diff] [blame] | 28 | #include "exec/gdbstub.h" |
David 'Digit' Turner | 34c48ff | 2013-12-15 00:25:03 +0100 | [diff] [blame] | 29 | #include "sysemu/dma.h" |
| 30 | #include "sysemu/kvm.h" |
David 'Digit' Turner | e1e03df | 2013-12-15 00:42:21 +0100 | [diff] [blame] | 31 | #include "exec/hax.h" |
David 'Digit' Turner | 23ca2ae | 2011-06-01 16:14:53 +0200 | [diff] [blame] | 32 | |
David 'Digit' Turner | 1182284 | 2013-12-17 09:16:47 +0100 | [diff] [blame^] | 33 | #include "sysemu/cpus.h" |
David 'Digit' Turner | 23ca2ae | 2011-06-01 16:14:53 +0200 | [diff] [blame] | 34 | |
| 35 | static CPUState *cur_cpu; |
| 36 | static CPUState *next_cpu; |
| 37 | |
| 38 | /***********************************************************/ |
| 39 | void hw_error(const char *fmt, ...) |
| 40 | { |
| 41 | va_list ap; |
| 42 | CPUState *env; |
| 43 | |
| 44 | va_start(ap, fmt); |
| 45 | fprintf(stderr, "qemu: hardware error: "); |
| 46 | vfprintf(stderr, fmt, ap); |
| 47 | fprintf(stderr, "\n"); |
| 48 | for(env = first_cpu; env != NULL; env = env->next_cpu) { |
| 49 | fprintf(stderr, "CPU #%d:\n", env->cpu_index); |
| 50 | #ifdef TARGET_I386 |
| 51 | cpu_dump_state(env, stderr, fprintf, X86_DUMP_FPU); |
| 52 | #else |
| 53 | cpu_dump_state(env, stderr, fprintf, 0); |
| 54 | #endif |
| 55 | } |
| 56 | va_end(ap); |
| 57 | abort(); |
| 58 | } |
| 59 | |
| 60 | static void do_vm_stop(int reason) |
| 61 | { |
| 62 | if (vm_running) { |
| 63 | cpu_disable_ticks(); |
| 64 | vm_running = 0; |
| 65 | pause_all_vcpus(); |
| 66 | vm_state_notify(0, reason); |
| 67 | } |
| 68 | } |
| 69 | |
| 70 | static int cpu_can_run(CPUState *env) |
| 71 | { |
| 72 | if (env->stop) |
| 73 | return 0; |
| 74 | if (env->stopped) |
| 75 | return 0; |
| 76 | return 1; |
| 77 | } |
| 78 | |
| 79 | static int cpu_has_work(CPUState *env) |
| 80 | { |
| 81 | if (env->stop) |
| 82 | return 1; |
| 83 | if (env->stopped) |
| 84 | return 0; |
| 85 | if (!env->halted) |
| 86 | return 1; |
| 87 | if (qemu_cpu_has_work(env)) |
| 88 | return 1; |
| 89 | return 0; |
| 90 | } |
| 91 | |
| 92 | int tcg_has_work(void) |
| 93 | { |
| 94 | CPUState *env; |
| 95 | |
| 96 | for (env = first_cpu; env != NULL; env = env->next_cpu) |
| 97 | if (cpu_has_work(env)) |
| 98 | return 1; |
| 99 | return 0; |
| 100 | } |
| 101 | |
| 102 | #ifndef _WIN32 |
| 103 | static int io_thread_fd = -1; |
| 104 | |
| 105 | #if 0 |
| 106 | static void qemu_event_increment(void) |
| 107 | { |
| 108 | static const char byte = 0; |
| 109 | |
| 110 | if (io_thread_fd == -1) |
| 111 | return; |
| 112 | |
| 113 | write(io_thread_fd, &byte, sizeof(byte)); |
| 114 | } |
| 115 | #endif |
| 116 | |
| 117 | static void qemu_event_read(void *opaque) |
| 118 | { |
| 119 | int fd = (unsigned long)opaque; |
| 120 | ssize_t len; |
| 121 | |
| 122 | /* Drain the notify pipe */ |
| 123 | do { |
| 124 | char buffer[512]; |
| 125 | len = read(fd, buffer, sizeof(buffer)); |
| 126 | } while ((len == -1 && errno == EINTR) || len > 0); |
| 127 | } |
| 128 | |
| 129 | static int qemu_event_init(void) |
| 130 | { |
| 131 | int err; |
| 132 | int fds[2]; |
| 133 | |
| 134 | err = pipe(fds); |
| 135 | if (err == -1) |
| 136 | return -errno; |
| 137 | |
| 138 | err = fcntl_setfl(fds[0], O_NONBLOCK); |
| 139 | if (err < 0) |
| 140 | goto fail; |
| 141 | |
| 142 | err = fcntl_setfl(fds[1], O_NONBLOCK); |
| 143 | if (err < 0) |
| 144 | goto fail; |
| 145 | |
| 146 | qemu_set_fd_handler2(fds[0], NULL, qemu_event_read, NULL, |
| 147 | (void *)(unsigned long)fds[0]); |
| 148 | |
| 149 | io_thread_fd = fds[1]; |
| 150 | return 0; |
| 151 | |
| 152 | fail: |
| 153 | close(fds[0]); |
| 154 | close(fds[1]); |
| 155 | return err; |
| 156 | } |
| 157 | #else |
| 158 | HANDLE qemu_event_handle; |
| 159 | |
| 160 | static void dummy_event_handler(void *opaque) |
| 161 | { |
| 162 | } |
| 163 | |
| 164 | static int qemu_event_init(void) |
| 165 | { |
| 166 | qemu_event_handle = CreateEvent(NULL, FALSE, FALSE, NULL); |
| 167 | if (!qemu_event_handle) { |
| 168 | perror("Failed CreateEvent"); |
| 169 | return -1; |
| 170 | } |
| 171 | qemu_add_wait_object(qemu_event_handle, dummy_event_handler, NULL); |
| 172 | return 0; |
| 173 | } |
| 174 | |
| 175 | #if 0 |
| 176 | static void qemu_event_increment(void) |
| 177 | { |
| 178 | SetEvent(qemu_event_handle); |
| 179 | } |
| 180 | #endif |
| 181 | #endif |
| 182 | |
| 183 | #ifndef CONFIG_IOTHREAD |
| 184 | int qemu_init_main_loop(void) |
| 185 | { |
| 186 | return qemu_event_init(); |
| 187 | } |
| 188 | |
| 189 | void qemu_init_vcpu(void *_env) |
| 190 | { |
| 191 | CPUState *env = _env; |
| 192 | |
| 193 | if (kvm_enabled()) |
| 194 | kvm_init_vcpu(env); |
Jun Nakajima | a381ef0 | 2011-12-17 19:13:25 -0800 | [diff] [blame] | 195 | #ifdef CONFIG_HAX |
| 196 | if (hax_enabled()) |
| 197 | hax_init_vcpu(env); |
| 198 | #endif |
David 'Digit' Turner | 23ca2ae | 2011-06-01 16:14:53 +0200 | [diff] [blame] | 199 | return; |
| 200 | } |
| 201 | |
| 202 | int qemu_cpu_self(void *env) |
| 203 | { |
| 204 | return 1; |
| 205 | } |
| 206 | |
| 207 | void resume_all_vcpus(void) |
| 208 | { |
| 209 | } |
| 210 | |
| 211 | void pause_all_vcpus(void) |
| 212 | { |
| 213 | } |
| 214 | |
| 215 | void qemu_cpu_kick(void *env) |
| 216 | { |
| 217 | return; |
| 218 | } |
| 219 | |
| 220 | void qemu_notify_event(void) |
| 221 | { |
| 222 | CPUState *env = cpu_single_env; |
| 223 | |
| 224 | if (env) { |
| 225 | cpu_exit(env); |
| 226 | #ifdef USE_KQEMU |
| 227 | if (env->kqemu_enabled) |
| 228 | kqemu_cpu_interrupt(env); |
| 229 | #endif |
Jun Nakajima | a381ef0 | 2011-12-17 19:13:25 -0800 | [diff] [blame] | 230 | /* |
| 231 | * This is mainly for the Windows host, where the timer may be in |
| 232 | * a different thread with vcpu. Thus the timer function needs to |
| 233 | * notify the vcpu thread of more than simply cpu_exit. If env is |
| 234 | * not NULL, it means that the vcpu is in execute state, we need |
| 235 | * only to set the flags. If the guest is in execute state, the |
| 236 | * HAX kernel module will exit to qemu. If env is NULL, vcpu is |
| 237 | * in main_loop_wait, and we need a event to notify it. |
| 238 | */ |
| 239 | #ifdef CONFIG_HAX |
| 240 | if (hax_enabled()) |
| 241 | hax_raise_event(env); |
| 242 | } else { |
| 243 | #ifdef _WIN32 |
| 244 | if(hax_enabled()) |
| 245 | SetEvent(qemu_event_handle); |
| 246 | #endif |
David 'Digit' Turner | 23ca2ae | 2011-06-01 16:14:53 +0200 | [diff] [blame] | 247 | } |
Jun Nakajima | a381ef0 | 2011-12-17 19:13:25 -0800 | [diff] [blame] | 248 | #else |
| 249 | } |
| 250 | #endif |
David 'Digit' Turner | 23ca2ae | 2011-06-01 16:14:53 +0200 | [diff] [blame] | 251 | } |
| 252 | |
| 253 | void qemu_mutex_lock_iothread(void) |
| 254 | { |
| 255 | } |
| 256 | |
| 257 | void qemu_mutex_unlock_iothread(void) |
| 258 | { |
| 259 | } |
| 260 | |
| 261 | void vm_stop(int reason) |
| 262 | { |
| 263 | do_vm_stop(reason); |
| 264 | } |
| 265 | |
| 266 | #else /* CONFIG_IOTHREAD */ |
| 267 | |
David 'Digit' Turner | 057b0f6 | 2013-12-15 00:58:30 +0100 | [diff] [blame] | 268 | #include "qemu/thread.h" |
David 'Digit' Turner | 23ca2ae | 2011-06-01 16:14:53 +0200 | [diff] [blame] | 269 | |
| 270 | QemuMutex qemu_global_mutex; |
| 271 | static QemuMutex qemu_fair_mutex; |
| 272 | |
| 273 | static QemuThread io_thread; |
| 274 | |
| 275 | static QemuThread *tcg_cpu_thread; |
| 276 | static QemuCond *tcg_halt_cond; |
| 277 | |
| 278 | static int qemu_system_ready; |
| 279 | /* cpu creation */ |
| 280 | static QemuCond qemu_cpu_cond; |
| 281 | /* system init */ |
| 282 | static QemuCond qemu_system_cond; |
| 283 | static QemuCond qemu_pause_cond; |
| 284 | |
| 285 | static void block_io_signals(void); |
| 286 | static void unblock_io_signals(void); |
| 287 | static int tcg_has_work(void); |
| 288 | |
| 289 | int qemu_init_main_loop(void) |
| 290 | { |
| 291 | int ret; |
| 292 | |
| 293 | ret = qemu_event_init(); |
| 294 | if (ret) |
| 295 | return ret; |
| 296 | |
| 297 | qemu_cond_init(&qemu_pause_cond); |
| 298 | qemu_mutex_init(&qemu_fair_mutex); |
| 299 | qemu_mutex_init(&qemu_global_mutex); |
| 300 | qemu_mutex_lock(&qemu_global_mutex); |
| 301 | |
| 302 | unblock_io_signals(); |
| 303 | qemu_thread_self(&io_thread); |
| 304 | |
| 305 | return 0; |
| 306 | } |
| 307 | |
| 308 | static void qemu_wait_io_event(CPUState *env) |
| 309 | { |
| 310 | while (!tcg_has_work()) |
| 311 | qemu_cond_timedwait(env->halt_cond, &qemu_global_mutex, 1000); |
| 312 | |
| 313 | qemu_mutex_unlock(&qemu_global_mutex); |
| 314 | |
| 315 | /* |
| 316 | * Users of qemu_global_mutex can be starved, having no chance |
| 317 | * to acquire it since this path will get to it first. |
| 318 | * So use another lock to provide fairness. |
| 319 | */ |
| 320 | qemu_mutex_lock(&qemu_fair_mutex); |
| 321 | qemu_mutex_unlock(&qemu_fair_mutex); |
| 322 | |
| 323 | qemu_mutex_lock(&qemu_global_mutex); |
| 324 | if (env->stop) { |
| 325 | env->stop = 0; |
| 326 | env->stopped = 1; |
| 327 | qemu_cond_signal(&qemu_pause_cond); |
| 328 | } |
| 329 | } |
| 330 | |
| 331 | static int qemu_cpu_exec(CPUState *env); |
| 332 | |
| 333 | static void *kvm_cpu_thread_fn(void *arg) |
| 334 | { |
| 335 | CPUState *env = arg; |
| 336 | |
| 337 | block_io_signals(); |
| 338 | qemu_thread_self(env->thread); |
| 339 | |
| 340 | /* signal CPU creation */ |
| 341 | qemu_mutex_lock(&qemu_global_mutex); |
| 342 | env->created = 1; |
| 343 | qemu_cond_signal(&qemu_cpu_cond); |
| 344 | |
| 345 | /* and wait for machine initialization */ |
| 346 | while (!qemu_system_ready) |
| 347 | qemu_cond_timedwait(&qemu_system_cond, &qemu_global_mutex, 100); |
| 348 | |
| 349 | while (1) { |
| 350 | if (cpu_can_run(env)) |
| 351 | qemu_cpu_exec(env); |
| 352 | qemu_wait_io_event(env); |
| 353 | } |
| 354 | |
| 355 | return NULL; |
| 356 | } |
| 357 | |
| 358 | static void tcg_cpu_exec(void); |
| 359 | |
| 360 | static void *tcg_cpu_thread_fn(void *arg) |
| 361 | { |
| 362 | CPUState *env = arg; |
| 363 | |
| 364 | block_io_signals(); |
| 365 | qemu_thread_self(env->thread); |
| 366 | |
| 367 | /* signal CPU creation */ |
| 368 | qemu_mutex_lock(&qemu_global_mutex); |
| 369 | for (env = first_cpu; env != NULL; env = env->next_cpu) |
| 370 | env->created = 1; |
| 371 | qemu_cond_signal(&qemu_cpu_cond); |
| 372 | |
| 373 | /* and wait for machine initialization */ |
| 374 | while (!qemu_system_ready) |
| 375 | qemu_cond_timedwait(&qemu_system_cond, &qemu_global_mutex, 100); |
| 376 | |
| 377 | while (1) { |
| 378 | tcg_cpu_exec(); |
| 379 | qemu_wait_io_event(cur_cpu); |
| 380 | } |
| 381 | |
| 382 | return NULL; |
| 383 | } |
| 384 | |
| 385 | void qemu_cpu_kick(void *_env) |
| 386 | { |
| 387 | CPUState *env = _env; |
| 388 | qemu_cond_broadcast(env->halt_cond); |
Jun Nakajima | a381ef0 | 2011-12-17 19:13:25 -0800 | [diff] [blame] | 389 | if (kvm_enabled() || hax_enabled()) |
David 'Digit' Turner | 23ca2ae | 2011-06-01 16:14:53 +0200 | [diff] [blame] | 390 | qemu_thread_signal(env->thread, SIGUSR1); |
| 391 | } |
| 392 | |
| 393 | int qemu_cpu_self(void *env) |
| 394 | { |
| 395 | return (cpu_single_env != NULL); |
| 396 | } |
| 397 | |
| 398 | static void cpu_signal(int sig) |
| 399 | { |
| 400 | if (cpu_single_env) |
| 401 | cpu_exit(cpu_single_env); |
| 402 | } |
| 403 | |
| 404 | static void block_io_signals(void) |
| 405 | { |
| 406 | sigset_t set; |
| 407 | struct sigaction sigact; |
| 408 | |
| 409 | sigemptyset(&set); |
| 410 | sigaddset(&set, SIGUSR2); |
| 411 | sigaddset(&set, SIGIO); |
| 412 | sigaddset(&set, SIGALRM); |
| 413 | pthread_sigmask(SIG_BLOCK, &set, NULL); |
| 414 | |
| 415 | sigemptyset(&set); |
| 416 | sigaddset(&set, SIGUSR1); |
| 417 | pthread_sigmask(SIG_UNBLOCK, &set, NULL); |
| 418 | |
| 419 | memset(&sigact, 0, sizeof(sigact)); |
| 420 | sigact.sa_handler = cpu_signal; |
| 421 | sigaction(SIGUSR1, &sigact, NULL); |
| 422 | } |
| 423 | |
| 424 | static void unblock_io_signals(void) |
| 425 | { |
| 426 | sigset_t set; |
| 427 | |
| 428 | sigemptyset(&set); |
| 429 | sigaddset(&set, SIGUSR2); |
| 430 | sigaddset(&set, SIGIO); |
| 431 | sigaddset(&set, SIGALRM); |
| 432 | pthread_sigmask(SIG_UNBLOCK, &set, NULL); |
| 433 | |
| 434 | sigemptyset(&set); |
| 435 | sigaddset(&set, SIGUSR1); |
| 436 | pthread_sigmask(SIG_BLOCK, &set, NULL); |
| 437 | } |
| 438 | |
| 439 | static void qemu_signal_lock(unsigned int msecs) |
| 440 | { |
| 441 | qemu_mutex_lock(&qemu_fair_mutex); |
| 442 | |
| 443 | while (qemu_mutex_trylock(&qemu_global_mutex)) { |
| 444 | qemu_thread_signal(tcg_cpu_thread, SIGUSR1); |
| 445 | if (!qemu_mutex_timedlock(&qemu_global_mutex, msecs)) |
| 446 | break; |
| 447 | } |
| 448 | qemu_mutex_unlock(&qemu_fair_mutex); |
| 449 | } |
| 450 | |
| 451 | void qemu_mutex_lock_iothread(void) |
| 452 | { |
Jun Nakajima | a381ef0 | 2011-12-17 19:13:25 -0800 | [diff] [blame] | 453 | if (kvm_enabled() || hax_enabled()) { |
David 'Digit' Turner | 23ca2ae | 2011-06-01 16:14:53 +0200 | [diff] [blame] | 454 | qemu_mutex_lock(&qemu_fair_mutex); |
| 455 | qemu_mutex_lock(&qemu_global_mutex); |
| 456 | qemu_mutex_unlock(&qemu_fair_mutex); |
| 457 | } else |
| 458 | qemu_signal_lock(100); |
| 459 | } |
| 460 | |
| 461 | void qemu_mutex_unlock_iothread(void) |
| 462 | { |
| 463 | qemu_mutex_unlock(&qemu_global_mutex); |
| 464 | } |
| 465 | |
| 466 | static int all_vcpus_paused(void) |
| 467 | { |
| 468 | CPUState *penv = first_cpu; |
| 469 | |
| 470 | while (penv) { |
| 471 | if (!penv->stopped) |
| 472 | return 0; |
| 473 | penv = (CPUState *)penv->next_cpu; |
| 474 | } |
| 475 | |
| 476 | return 1; |
| 477 | } |
| 478 | |
| 479 | void pause_all_vcpus(void) |
| 480 | { |
| 481 | CPUState *penv = first_cpu; |
| 482 | |
| 483 | while (penv) { |
| 484 | penv->stop = 1; |
| 485 | qemu_thread_signal(penv->thread, SIGUSR1); |
| 486 | qemu_cpu_kick(penv); |
| 487 | penv = (CPUState *)penv->next_cpu; |
| 488 | } |
| 489 | |
| 490 | while (!all_vcpus_paused()) { |
| 491 | qemu_cond_timedwait(&qemu_pause_cond, &qemu_global_mutex, 100); |
| 492 | penv = first_cpu; |
| 493 | while (penv) { |
| 494 | qemu_thread_signal(penv->thread, SIGUSR1); |
| 495 | penv = (CPUState *)penv->next_cpu; |
| 496 | } |
| 497 | } |
| 498 | } |
| 499 | |
| 500 | void resume_all_vcpus(void) |
| 501 | { |
| 502 | CPUState *penv = first_cpu; |
| 503 | |
| 504 | while (penv) { |
| 505 | penv->stop = 0; |
| 506 | penv->stopped = 0; |
| 507 | qemu_thread_signal(penv->thread, SIGUSR1); |
| 508 | qemu_cpu_kick(penv); |
| 509 | penv = (CPUState *)penv->next_cpu; |
| 510 | } |
| 511 | } |
| 512 | |
| 513 | static void tcg_init_vcpu(void *_env) |
| 514 | { |
| 515 | CPUState *env = _env; |
| 516 | /* share a single thread for all cpus with TCG */ |
| 517 | if (!tcg_cpu_thread) { |
| 518 | env->thread = qemu_mallocz(sizeof(QemuThread)); |
| 519 | env->halt_cond = qemu_mallocz(sizeof(QemuCond)); |
| 520 | qemu_cond_init(env->halt_cond); |
| 521 | qemu_thread_create(env->thread, tcg_cpu_thread_fn, env); |
| 522 | while (env->created == 0) |
| 523 | qemu_cond_timedwait(&qemu_cpu_cond, &qemu_global_mutex, 100); |
| 524 | tcg_cpu_thread = env->thread; |
| 525 | tcg_halt_cond = env->halt_cond; |
| 526 | } else { |
| 527 | env->thread = tcg_cpu_thread; |
| 528 | env->halt_cond = tcg_halt_cond; |
| 529 | } |
| 530 | } |
| 531 | |
| 532 | static void kvm_start_vcpu(CPUState *env) |
| 533 | { |
| 534 | #if 0 |
| 535 | kvm_init_vcpu(env); |
| 536 | env->thread = qemu_mallocz(sizeof(QemuThread)); |
| 537 | env->halt_cond = qemu_mallocz(sizeof(QemuCond)); |
| 538 | qemu_cond_init(env->halt_cond); |
| 539 | qemu_thread_create(env->thread, kvm_cpu_thread_fn, env); |
| 540 | while (env->created == 0) |
| 541 | qemu_cond_timedwait(&qemu_cpu_cond, &qemu_global_mutex, 100); |
| 542 | #endif |
| 543 | } |
| 544 | |
| 545 | void qemu_init_vcpu(void *_env) |
| 546 | { |
| 547 | CPUState *env = _env; |
| 548 | |
| 549 | if (kvm_enabled()) |
| 550 | kvm_start_vcpu(env); |
| 551 | else |
| 552 | tcg_init_vcpu(env); |
| 553 | } |
| 554 | |
| 555 | void qemu_notify_event(void) |
| 556 | { |
| 557 | qemu_event_increment(); |
| 558 | } |
| 559 | |
| 560 | void vm_stop(int reason) |
| 561 | { |
| 562 | QemuThread me; |
| 563 | qemu_thread_self(&me); |
| 564 | |
| 565 | if (!qemu_thread_equal(&me, &io_thread)) { |
| 566 | qemu_system_vmstop_request(reason); |
| 567 | /* |
| 568 | * FIXME: should not return to device code in case |
| 569 | * vm_stop() has been requested. |
| 570 | */ |
| 571 | if (cpu_single_env) { |
| 572 | cpu_exit(cpu_single_env); |
| 573 | cpu_single_env->stop = 1; |
| 574 | } |
| 575 | return; |
| 576 | } |
| 577 | do_vm_stop(reason); |
| 578 | } |
| 579 | |
| 580 | #endif |
| 581 | |
| 582 | static int qemu_cpu_exec(CPUState *env) |
| 583 | { |
| 584 | int ret; |
| 585 | #ifdef CONFIG_PROFILER |
| 586 | int64_t ti; |
| 587 | #endif |
| 588 | |
| 589 | #ifdef CONFIG_PROFILER |
| 590 | ti = profile_getclock(); |
| 591 | #endif |
| 592 | if (use_icount) { |
| 593 | int64_t count; |
| 594 | int decr; |
| 595 | qemu_icount -= (env->icount_decr.u16.low + env->icount_extra); |
| 596 | env->icount_decr.u16.low = 0; |
| 597 | env->icount_extra = 0; |
| 598 | count = qemu_next_icount_deadline(); |
| 599 | count = (count + (1 << icount_time_shift) - 1) |
| 600 | >> icount_time_shift; |
| 601 | qemu_icount += count; |
| 602 | decr = (count > 0xffff) ? 0xffff : count; |
| 603 | count -= decr; |
| 604 | env->icount_decr.u16.low = decr; |
| 605 | env->icount_extra = count; |
| 606 | } |
| 607 | #ifdef CONFIG_TRACE |
| 608 | if (tbflush_requested) { |
| 609 | tbflush_requested = 0; |
| 610 | tb_flush(env); |
| 611 | return EXCP_INTERRUPT; |
| 612 | } |
| 613 | #endif |
| 614 | |
| 615 | |
| 616 | ret = cpu_exec(env); |
| 617 | #ifdef CONFIG_PROFILER |
| 618 | qemu_time += profile_getclock() - ti; |
| 619 | #endif |
| 620 | if (use_icount) { |
| 621 | /* Fold pending instructions back into the |
| 622 | instruction counter, and clear the interrupt flag. */ |
| 623 | qemu_icount -= (env->icount_decr.u16.low |
| 624 | + env->icount_extra); |
| 625 | env->icount_decr.u32 = 0; |
| 626 | env->icount_extra = 0; |
| 627 | } |
| 628 | return ret; |
| 629 | } |
| 630 | |
| 631 | void tcg_cpu_exec(void) |
| 632 | { |
| 633 | int ret = 0; |
| 634 | |
| 635 | if (next_cpu == NULL) |
| 636 | next_cpu = first_cpu; |
| 637 | for (; next_cpu != NULL; next_cpu = next_cpu->next_cpu) { |
| 638 | CPUState *env = cur_cpu = next_cpu; |
| 639 | |
| 640 | if (!vm_running) |
| 641 | break; |
| 642 | if (qemu_timer_alarm_pending()) { |
| 643 | break; |
| 644 | } |
| 645 | if (cpu_can_run(env)) |
| 646 | ret = qemu_cpu_exec(env); |
| 647 | if (ret == EXCP_DEBUG) { |
| 648 | gdb_set_stop_cpu(env); |
| 649 | debug_requested = 1; |
| 650 | break; |
| 651 | } |
| 652 | } |
| 653 | } |
| 654 | |