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