cpu-target.c

   1 /*
   2  * Target-specific parts of the CPU object
   3  *
   4  *  Copyright (c) 2003 Fabrice Bellard
   5  *
   6  * This library is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU Lesser General Public
   8  * License as published by the Free Software Foundation; either
   9  * version 2 of the License, or (at your option) any later version.
  10  *
  11  * This library is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * Lesser General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Lesser General Public
  17  * License along with this library; if not, see <http://www.gnu.org/licenses/>.
  18  */
  19
  20 #include "qemu/osdep.h"
  21 #include "qapi/error.h"
  22
  23 #include "exec/target_page.h"
  24 #include "hw/qdev-core.h"
  25 #include "hw/qdev-properties.h"
  26 #include "qemu/error-report.h"
  27 #include "qemu/qemu-print.h"
  28 #include "migration/vmstate.h"
  29 #ifdef CONFIG_USER_ONLY
  30 #include "qemu.h"
  31 #else
  32 #include "hw/core/sysemu-cpu-ops.h"
  33 #include "exec/address-spaces.h"
  34 #include "exec/memory.h"
  35 #endif
  36 #include "sysemu/cpus.h"
  37 #include "sysemu/tcg.h"
  38 #include "exec/replay-core.h"
  39 #include "exec/cpu-common.h"
  40 #include "exec/exec-all.h"
  41 #include "exec/tb-flush.h"
  42 #include "exec/translate-all.h"
  43 #include "exec/log.h"
  44 #include "hw/core/accel-cpu.h"
  45 #include "trace/trace-root.h"
  46 #include "qemu/accel.h"
  47
  48 uintptr_t qemu_host_page_size;
  49 intptr_t qemu_host_page_mask;
  50
  51 #ifndef CONFIG_USER_ONLY
  52 static int cpu_common_post_load(void *opaque, int version_id)
  53 {
  54     CPUState *cpu = opaque;
  55
  56     /* 0x01 was CPU_INTERRUPT_EXIT. This line can be removed when the
  57        version_id is increased. */
  58     cpu->interrupt_request &= ~0x01;
  59     tlb_flush(cpu);
  60
  61     /* loadvm has just updated the content of RAM, bypassing the
  62      * usual mechanisms that ensure we flush TBs for writes to
  63      * memory we've translated code from. So we must flush all TBs,
  64      * which will now be stale.
  65      */
  66     tb_flush(cpu);
  67
  68     return 0;
  69 }
  70
  71 static int cpu_common_pre_load(void *opaque)
  72 {
  73     CPUState *cpu = opaque;
  74
  75     cpu->exception_index = -1;
  76
  77     return 0;
  78 }
  79
  80 static bool cpu_common_exception_index_needed(void *opaque)
  81 {
  82     CPUState *cpu = opaque;
  83
  84     return tcg_enabled() && cpu->exception_index != -1;
  85 }
  86
  87 static const VMStateDescription vmstate_cpu_common_exception_index = {
  88     .name = "cpu_common/exception_index",
  89     .version_id = 1,
  90     .minimum_version_id = 1,
  91     .needed = cpu_common_exception_index_needed,
  92     .fields = (const VMStateField[]) {
  93         VMSTATE_INT32(exception_index, CPUState),
  94         VMSTATE_END_OF_LIST()
  95     }
  96 };
  97
  98 static bool cpu_common_crash_occurred_needed(void *opaque)
  99 {
 100     CPUState *cpu = opaque;
 101
 102     return cpu->crash_occurred;
 103 }
 104
 105 static const VMStateDescription vmstate_cpu_common_crash_occurred = {
 106     .name = "cpu_common/crash_occurred",
 107     .version_id = 1,
 108     .minimum_version_id = 1,
 109     .needed = cpu_common_crash_occurred_needed,
 110     .fields = (const VMStateField[]) {
 111         VMSTATE_BOOL(crash_occurred, CPUState),
 112         VMSTATE_END_OF_LIST()
 113     }
 114 };
 115
 116 const VMStateDescription vmstate_cpu_common = {
 117     .name = "cpu_common",
 118     .version_id = 1,
 119     .minimum_version_id = 1,
 120     .pre_load = cpu_common_pre_load,
 121     .post_load = cpu_common_post_load,
 122     .fields = (const VMStateField[]) {
 123         VMSTATE_UINT32(halted, CPUState),
 124         VMSTATE_UINT32(interrupt_request, CPUState),
 125         VMSTATE_END_OF_LIST()
 126     },
 127     .subsections = (const VMStateDescription * const []) {
 128         &vmstate_cpu_common_exception_index,
 129         &vmstate_cpu_common_crash_occurred,
 130         NULL
 131     }
 132 };
 133 #endif
 134
 135 bool cpu_exec_realizefn(CPUState *cpu, Error **errp)
 136 {
 137     /* cache the cpu class for the hotpath */
 138     cpu->cc = CPU_GET_CLASS(cpu);
 139
 140     if (!accel_cpu_common_realize(cpu, errp)) {
 141         return false;
 142     }
 143
 144     /* Wait until cpu initialization complete before exposing cpu. */
 145     cpu_list_add(cpu);
 146
 147 #ifdef CONFIG_USER_ONLY
 148     assert(qdev_get_vmsd(DEVICE(cpu)) == NULL ||
 149            qdev_get_vmsd(DEVICE(cpu))->unmigratable);
 150 #else
 151     if (qdev_get_vmsd(DEVICE(cpu)) == NULL) {
 152         vmstate_register(NULL, cpu->cpu_index, &vmstate_cpu_common, cpu);
 153     }
 154     if (cpu->cc->sysemu_ops->legacy_vmsd != NULL) {
 155         vmstate_register(NULL, cpu->cpu_index, cpu->cc->sysemu_ops->legacy_vmsd, cpu);
 156     }
 157 #endif /* CONFIG_USER_ONLY */
 158
 159     return true;
 160 }
 161
 162 void cpu_exec_unrealizefn(CPUState *cpu)
 163 {
 164 #ifndef CONFIG_USER_ONLY
 165     CPUClass *cc = CPU_GET_CLASS(cpu);
 166
 167     if (cc->sysemu_ops->legacy_vmsd != NULL) {
 168         vmstate_unregister(NULL, cc->sysemu_ops->legacy_vmsd, cpu);
 169     }
 170     if (qdev_get_vmsd(DEVICE(cpu)) == NULL) {
 171         vmstate_unregister(NULL, &vmstate_cpu_common, cpu);
 172     }
 173 #endif
 174
 175     cpu_list_remove(cpu);
 176     /*
 177      * Now that the vCPU has been removed from the RCU list, we can call
 178      * accel_cpu_common_unrealize, which may free fields using call_rcu.
 179      */
 180     accel_cpu_common_unrealize(cpu);
 181 }
 182
 183 /*
 184  * This can't go in hw/core/cpu.c because that file is compiled only
 185  * once for both user-mode and system builds.
 186  */
 187 static Property cpu_common_props[] = {
 188 #ifdef CONFIG_USER_ONLY
 189     /*
 190      * Create a property for the user-only object, so users can
 191      * adjust prctl(PR_SET_UNALIGN) from the command-line.
 192      * Has no effect if the target does not support the feature.
 193      */
 194     DEFINE_PROP_BOOL("prctl-unalign-sigbus", CPUState,
 195                      prctl_unalign_sigbus, false),
 196 #else
 197     /*
 198      * Create a memory property for system CPU object, so users can
 199      * wire up its memory.  The default if no link is set up is to use
 200      * the system address space.
 201      */
 202     DEFINE_PROP_LINK("memory", CPUState, memory, TYPE_MEMORY_REGION,
 203                      MemoryRegion *),
 204 #endif
 205     DEFINE_PROP_END_OF_LIST(),
 206 };
 207
 208 #ifndef CONFIG_USER_ONLY
 209 static bool cpu_get_start_powered_off(Object *obj, Error **errp)
 210 {
 211     CPUState *cpu = CPU(obj);
 212     return cpu->start_powered_off;
 213 }
 214
 215 static void cpu_set_start_powered_off(Object *obj, bool value, Error **errp)
 216 {
 217     CPUState *cpu = CPU(obj);
 218     cpu->start_powered_off = value;
 219 }
 220 #endif
 221
 222 void cpu_class_init_props(DeviceClass *dc)
 223 {
 224 #ifndef CONFIG_USER_ONLY
 225     ObjectClass *oc = OBJECT_CLASS(dc);
 226
 227     /*
 228      * We can't use DEFINE_PROP_BOOL in the Property array for this
 229      * property, because we want this to be settable after realize.
 230      */
 231     object_class_property_add_bool(oc, "start-powered-off",
 232                                    cpu_get_start_powered_off,
 233                                    cpu_set_start_powered_off);
 234 #endif
 235
 236     device_class_set_props(dc, cpu_common_props);
 237 }
 238
 239 void cpu_exec_initfn(CPUState *cpu)
 240 {
 241     cpu->as = NULL;
 242     cpu->num_ases = 0;
 243
 244 #ifndef CONFIG_USER_ONLY
 245     cpu->thread_id = qemu_get_thread_id();
 246     cpu->memory = get_system_memory();
 247     object_ref(OBJECT(cpu->memory));
 248 #endif
 249 }
 250
 251 char *cpu_model_from_type(const char *typename)
 252 {
 253     const char *suffix = "-" CPU_RESOLVING_TYPE;
 254
 255     if (!object_class_by_name(typename)) {
 256         return NULL;
 257     }
 258
 259     if (g_str_has_suffix(typename, suffix)) {
 260         return g_strndup(typename, strlen(typename) - strlen(suffix));
 261     }
 262
 263     return g_strdup(typename);
 264 }
 265
 266 const char *parse_cpu_option(const char *cpu_option)
 267 {
 268     ObjectClass *oc;
 269     CPUClass *cc;
 270     gchar **model_pieces;
 271     const char *cpu_type;
 272
 273     model_pieces = g_strsplit(cpu_option, ",", 2);
 274     if (!model_pieces[0]) {
 275         error_report("-cpu option cannot be empty");
 276         exit(1);
 277     }
 278
 279     oc = cpu_class_by_name(CPU_RESOLVING_TYPE, model_pieces[0]);
 280     if (oc == NULL) {
 281         error_report("unable to find CPU model '%s'", model_pieces[0]);
 282         g_strfreev(model_pieces);
 283         exit(EXIT_FAILURE);
 284     }
 285
 286     cpu_type = object_class_get_name(oc);
 287     cc = CPU_CLASS(oc);
 288     cc->parse_features(cpu_type, model_pieces[1], &error_fatal);
 289     g_strfreev(model_pieces);
 290     return cpu_type;
 291 }
 292
 293 #ifndef cpu_list
 294 static void cpu_list_entry(gpointer data, gpointer user_data)
 295 {
 296     CPUClass *cc = CPU_CLASS(OBJECT_CLASS(data));
 297     const char *typename = object_class_get_name(OBJECT_CLASS(data));
 298     g_autofree char *model = cpu_model_from_type(typename);
 299
 300     if (cc->deprecation_note) {
 301         qemu_printf("  %s (deprecated)\n", model);
 302     } else {
 303         qemu_printf("  %s\n", model);
 304     }
 305 }
 306
 307 static void cpu_list(void)
 308 {
 309     GSList *list;
 310
 311     list = object_class_get_list_sorted(TYPE_CPU, false);
 312     qemu_printf("Available CPUs:\n");
 313     g_slist_foreach(list, cpu_list_entry, NULL);
 314     g_slist_free(list);
 315 }
 316 #endif
 317
 318 void list_cpus(void)
 319 {
 320     cpu_list();
 321 }
 322
 323 /* enable or disable single step mode. EXCP_DEBUG is returned by the
 324    CPU loop after each instruction */
 325 void cpu_single_step(CPUState *cpu, int enabled)
 326 {
 327     if (cpu->singlestep_enabled != enabled) {
 328         cpu->singlestep_enabled = enabled;
 329
 330 #if !defined(CONFIG_USER_ONLY)
 331         const AccelOpsClass *ops = cpus_get_accel();
 332         if (ops->update_guest_debug) {
 333             ops->update_guest_debug(cpu);
 334         }
 335 #endif
 336
 337         trace_breakpoint_singlestep(cpu->cpu_index, enabled);
 338     }
 339 }
 340
 341 void cpu_abort(CPUState *cpu, const char *fmt, ...)
 342 {
 343     va_list ap;
 344     va_list ap2;
 345
 346     va_start(ap, fmt);
 347     va_copy(ap2, ap);
 348     fprintf(stderr, "qemu: fatal: ");
 349     vfprintf(stderr, fmt, ap);
 350     fprintf(stderr, "\n");
 351     cpu_dump_state(cpu, stderr, CPU_DUMP_FPU | CPU_DUMP_CCOP);
 352     if (qemu_log_separate()) {
 353         FILE *logfile = qemu_log_trylock();
 354         if (logfile) {
 355             fprintf(logfile, "qemu: fatal: ");
 356             vfprintf(logfile, fmt, ap2);
 357             fprintf(logfile, "\n");
 358             cpu_dump_state(cpu, logfile, CPU_DUMP_FPU | CPU_DUMP_CCOP);
 359             qemu_log_unlock(logfile);
 360         }
 361     }
 362     va_end(ap2);
 363     va_end(ap);
 364     replay_finish();
 365 #if defined(CONFIG_USER_ONLY)
 366     {
 367         struct sigaction act;
 368         sigfillset(&act.sa_mask);
 369         act.sa_handler = SIG_DFL;
 370         act.sa_flags = 0;
 371         sigaction(SIGABRT, &act, NULL);
 372     }
 373 #endif
 374     abort();
 375 }
 376
 377 /* physical memory access (slow version, mainly for debug) */
 378 #if defined(CONFIG_USER_ONLY)
 379 int cpu_memory_rw_debug(CPUState *cpu, vaddr addr,
 380                         void *ptr, size_t len, bool is_write)
 381 {
 382     int flags;
 383     vaddr l, page;
 384     void * p;
 385     uint8_t *buf = ptr;
 386     ssize_t written;
 387     int ret = -1;
 388     int fd = -1;
 389
 390     while (len > 0) {
 391         page = addr & TARGET_PAGE_MASK;
 392         l = (page + TARGET_PAGE_SIZE) - addr;
 393         if (l > len)
 394             l = len;
 395         flags = page_get_flags(page);
 396         if (!(flags & PAGE_VALID)) {
 397             goto out_close;
 398         }
 399         if (is_write) {
 400             if (flags & PAGE_WRITE) {
 401                 /* XXX: this code should not depend on lock_user */
 402                 p = lock_user(VERIFY_WRITE, addr, l, 0);
 403                 if (!p) {
 404                     goto out_close;
 405                 }
 406                 memcpy(p, buf, l);
 407                 unlock_user(p, addr, l);
 408             } else {
 409                 /* Bypass the host page protection using ptrace. */
 410                 if (fd == -1) {
 411                     fd = open("/proc/self/mem", O_WRONLY);
 412                     if (fd == -1) {
 413                         goto out;
 414                     }
 415                 }
 416                 /*
 417                  * If there is a TranslationBlock and we weren't bypassing the
 418                  * host page protection, the memcpy() above would SEGV,
 419                  * ultimately leading to page_unprotect(). So invalidate the
 420                  * translations manually. Both invalidation and pwrite() must
 421                  * be under mmap_lock() in order to prevent the creation of
 422                  * another TranslationBlock in between.
 423                  */
 424                 mmap_lock();
 425                 tb_invalidate_phys_range(addr, addr + l - 1);
 426                 written = pwrite(fd, buf, l,
 427                                  (off_t)(uintptr_t)g2h_untagged(addr));
 428                 mmap_unlock();
 429                 if (written != l) {
 430                     goto out_close;
 431                 }
 432             }
 433         } else if (flags & PAGE_READ) {
 434             /* XXX: this code should not depend on lock_user */
 435             p = lock_user(VERIFY_READ, addr, l, 1);
 436             if (!p) {
 437                 goto out_close;
 438             }
 439             memcpy(buf, p, l);
 440             unlock_user(p, addr, 0);
 441         } else {
 442             /* Bypass the host page protection using ptrace. */
 443             if (fd == -1) {
 444                 fd = open("/proc/self/mem", O_RDONLY);
 445                 if (fd == -1) {
 446                     goto out;
 447                 }
 448             }
 449             if (pread(fd, buf, l,
 450                       (off_t)(uintptr_t)g2h_untagged(addr)) != l) {
 451                 goto out_close;
 452             }
 453         }
 454         len -= l;
 455         buf += l;
 456         addr += l;
 457     }
 458     ret = 0;
 459 out_close:
 460     if (fd != -1) {
 461         close(fd);
 462     }
 463 out:
 464     return ret;
 465 }
 466 #endif
 467
 468 bool target_words_bigendian(void)
 469 {
 470     return TARGET_BIG_ENDIAN;
 471 }
 472
 473 const char *target_name(void)
 474 {
 475     return TARGET_NAME;
 476 }
 477
 478 void page_size_init(void)
 479 {
 480     /* NOTE: we can always suppose that qemu_host_page_size >=
 481        TARGET_PAGE_SIZE */
 482     if (qemu_host_page_size == 0) {
 483         qemu_host_page_size = qemu_real_host_page_size();
 484     }
 485     if (qemu_host_page_size < TARGET_PAGE_SIZE) {
 486         qemu_host_page_size = TARGET_PAGE_SIZE;
 487     }
 488     qemu_host_page_mask = -(intptr_t)qemu_host_page_size;
 489 }