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