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 static bool cpu_get_start_powered_off(Object *obj, Error **errp)
 208 {
 209     CPUState *cpu = CPU(obj);
 210     return cpu->start_powered_off;
 211 }
 212
 213 static void cpu_set_start_powered_off(Object *obj, bool value, Error **errp)
 214 {
 215     CPUState *cpu = CPU(obj);
 216     cpu->start_powered_off = value;
 217 }
 218
 219 void cpu_class_init_props(DeviceClass *dc)
 220 {
 221     ObjectClass *oc = OBJECT_CLASS(dc);
 222
 223     device_class_set_props(dc, cpu_common_props);
 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 }
 232
 233 void cpu_exec_initfn(CPUState *cpu)
 234 {
 235     cpu->as = NULL;
 236     cpu->num_ases = 0;
 237
 238 #ifndef CONFIG_USER_ONLY
 239     cpu->thread_id = qemu_get_thread_id();
 240     cpu->memory = get_system_memory();
 241     object_ref(OBJECT(cpu->memory));
 242 #endif
 243 }
 244
 245 char *cpu_model_from_type(const char *typename)
 246 {
 247     const char *suffix = "-" CPU_RESOLVING_TYPE;
 248
 249     if (!object_class_by_name(typename)) {
 250         return NULL;
 251     }
 252
 253     if (g_str_has_suffix(typename, suffix)) {
 254         return g_strndup(typename, strlen(typename) - strlen(suffix));
 255     }
 256
 257     return g_strdup(typename);
 258 }
 259
 260 const char *parse_cpu_option(const char *cpu_option)
 261 {
 262     ObjectClass *oc;
 263     CPUClass *cc;
 264     gchar **model_pieces;
 265     const char *cpu_type;
 266
 267     model_pieces = g_strsplit(cpu_option, ",", 2);
 268     if (!model_pieces[0]) {
 269         error_report("-cpu option cannot be empty");
 270         exit(1);
 271     }
 272
 273     oc = cpu_class_by_name(CPU_RESOLVING_TYPE, model_pieces[0]);
 274     if (oc == NULL) {
 275         error_report("unable to find CPU model '%s'", model_pieces[0]);
 276         g_strfreev(model_pieces);
 277         exit(EXIT_FAILURE);
 278     }
 279
 280     cpu_type = object_class_get_name(oc);
 281     cc = CPU_CLASS(oc);
 282     cc->parse_features(cpu_type, model_pieces[1], &error_fatal);
 283     g_strfreev(model_pieces);
 284     return cpu_type;
 285 }
 286
 287 #ifndef cpu_list
 288 static void cpu_list_entry(gpointer data, gpointer user_data)
 289 {
 290     CPUClass *cc = CPU_CLASS(OBJECT_CLASS(data));
 291     const char *typename = object_class_get_name(OBJECT_CLASS(data));
 292     g_autofree char *model = cpu_model_from_type(typename);
 293
 294     if (cc->deprecation_note) {
 295         qemu_printf("  %s (deprecated)\n", model);
 296     } else {
 297         qemu_printf("  %s\n", model);
 298     }
 299 }
 300
 301 static void cpu_list(void)
 302 {
 303     GSList *list;
 304
 305     list = object_class_get_list_sorted(TYPE_CPU, false);
 306     qemu_printf("Available CPUs:\n");
 307     g_slist_foreach(list, cpu_list_entry, NULL);
 308     g_slist_free(list);
 309 }
 310 #endif
 311
 312 void list_cpus(void)
 313 {
 314     cpu_list();
 315 }
 316
 317 #if defined(CONFIG_USER_ONLY)
 318 void tb_invalidate_phys_addr(hwaddr addr)
 319 {
 320     mmap_lock();
 321     tb_invalidate_phys_page(addr);
 322     mmap_unlock();
 323 }
 324 #else
 325 void tb_invalidate_phys_addr(AddressSpace *as, hwaddr addr, MemTxAttrs attrs)
 326 {
 327     ram_addr_t ram_addr;
 328     MemoryRegion *mr;
 329     hwaddr l = 1;
 330
 331     if (!tcg_enabled()) {
 332         return;
 333     }
 334
 335     RCU_READ_LOCK_GUARD();
 336     mr = address_space_translate(as, addr, &addr, &l, false, attrs);
 337     if (!(memory_region_is_ram(mr)
 338           || memory_region_is_romd(mr))) {
 339         return;
 340     }
 341     ram_addr = memory_region_get_ram_addr(mr) + addr;
 342     tb_invalidate_phys_page(ram_addr);
 343 }
 344 #endif
 345
 346 /* enable or disable single step mode. EXCP_DEBUG is returned by the
 347    CPU loop after each instruction */
 348 void cpu_single_step(CPUState *cpu, int enabled)
 349 {
 350     if (cpu->singlestep_enabled != enabled) {
 351         cpu->singlestep_enabled = enabled;
 352
 353 #if !defined(CONFIG_USER_ONLY)
 354         const AccelOpsClass *ops = cpus_get_accel();
 355         if (ops->update_guest_debug) {
 356             ops->update_guest_debug(cpu);
 357         }
 358 #endif
 359
 360         trace_breakpoint_singlestep(cpu->cpu_index, enabled);
 361     }
 362 }
 363
 364 void cpu_abort(CPUState *cpu, const char *fmt, ...)
 365 {
 366     va_list ap;
 367     va_list ap2;
 368
 369     va_start(ap, fmt);
 370     va_copy(ap2, ap);
 371     fprintf(stderr, "qemu: fatal: ");
 372     vfprintf(stderr, fmt, ap);
 373     fprintf(stderr, "\n");
 374     cpu_dump_state(cpu, stderr, CPU_DUMP_FPU | CPU_DUMP_CCOP);
 375     if (qemu_log_separate()) {
 376         FILE *logfile = qemu_log_trylock();
 377         if (logfile) {
 378             fprintf(logfile, "qemu: fatal: ");
 379             vfprintf(logfile, fmt, ap2);
 380             fprintf(logfile, "\n");
 381             cpu_dump_state(cpu, logfile, CPU_DUMP_FPU | CPU_DUMP_CCOP);
 382             qemu_log_unlock(logfile);
 383         }
 384     }
 385     va_end(ap2);
 386     va_end(ap);
 387     replay_finish();
 388 #if defined(CONFIG_USER_ONLY)
 389     {
 390         struct sigaction act;
 391         sigfillset(&act.sa_mask);
 392         act.sa_handler = SIG_DFL;
 393         act.sa_flags = 0;
 394         sigaction(SIGABRT, &act, NULL);
 395     }
 396 #endif
 397     abort();
 398 }
 399
 400 /* physical memory access (slow version, mainly for debug) */
 401 #if defined(CONFIG_USER_ONLY)
 402 int cpu_memory_rw_debug(CPUState *cpu, vaddr addr,
 403                         void *ptr, size_t len, bool is_write)
 404 {
 405     int flags;
 406     vaddr l, page;
 407     void * p;
 408     uint8_t *buf = ptr;
 409
 410     while (len > 0) {
 411         page = addr & TARGET_PAGE_MASK;
 412         l = (page + TARGET_PAGE_SIZE) - addr;
 413         if (l > len)
 414             l = len;
 415         flags = page_get_flags(page);
 416         if (!(flags & PAGE_VALID))
 417             return -1;
 418         if (is_write) {
 419             if (!(flags & PAGE_WRITE))
 420                 return -1;
 421             /* XXX: this code should not depend on lock_user */
 422             if (!(p = lock_user(VERIFY_WRITE, addr, l, 0)))
 423                 return -1;
 424             memcpy(p, buf, l);
 425             unlock_user(p, addr, l);
 426         } else {
 427             if (!(flags & PAGE_READ))
 428                 return -1;
 429             /* XXX: this code should not depend on lock_user */
 430             if (!(p = lock_user(VERIFY_READ, addr, l, 1)))
 431                 return -1;
 432             memcpy(buf, p, l);
 433             unlock_user(p, addr, 0);
 434         }
 435         len -= l;
 436         buf += l;
 437         addr += l;
 438     }
 439     return 0;
 440 }
 441 #endif
 442
 443 bool target_words_bigendian(void)
 444 {
 445     return TARGET_BIG_ENDIAN;
 446 }
 447
 448 const char *target_name(void)
 449 {
 450     return TARGET_NAME;
 451 }
 452
 453 void page_size_init(void)
 454 {
 455     /* NOTE: we can always suppose that qemu_host_page_size >=
 456        TARGET_PAGE_SIZE */
 457     if (qemu_host_page_size == 0) {
 458         qemu_host_page_size = qemu_real_host_page_size();
 459     }
 460     if (qemu_host_page_size < TARGET_PAGE_SIZE) {
 461         qemu_host_page_size = TARGET_PAGE_SIZE;
 462     }
 463     qemu_host_page_mask = -(intptr_t)qemu_host_page_size;
 464 }