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 "migration/vmstate.h"
  28 #ifdef CONFIG_USER_ONLY
  29 #include "qemu.h"
  30 #else
  31 #include "hw/core/sysemu-cpu-ops.h"
  32 #include "exec/address-spaces.h"
  33 #endif
  34 #include "sysemu/cpus.h"
  35 #include "sysemu/tcg.h"
  36 #include "exec/replay-core.h"
  37 #include "exec/cpu-common.h"
  38 #include "exec/exec-all.h"
  39 #include "exec/tb-flush.h"
  40 #include "exec/translate-all.h"
  41 #include "exec/log.h"
  42 #include "hw/core/accel-cpu.h"
  43 #include "trace/trace-root.h"
  44 #include "qemu/accel.h"
  45 #include "qemu/plugin.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 = (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 = (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 = (VMStateField[]) {
 122         VMSTATE_UINT32(halted, CPUState),
 123         VMSTATE_UINT32(interrupt_request, CPUState),
 124         VMSTATE_END_OF_LIST()
 125     },
 126     .subsections = (const VMStateDescription*[]) {
 127         &vmstate_cpu_common_exception_index,
 128         &vmstate_cpu_common_crash_occurred,
 129         NULL
 130     }
 131 };
 132 #endif
 133
 134 void 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;
 141     }
 142
 143     /* Wait until cpu initialization complete before exposing cpu. */
 144     cpu_list_add(cpu);
 145
 146     /* Plugin initialization must wait until cpu_index assigned. */
 147     if (tcg_enabled()) {
 148         qemu_plugin_vcpu_init_hook(cpu);
 149     }
 150
 151 #ifdef CONFIG_USER_ONLY
 152     assert(qdev_get_vmsd(DEVICE(cpu)) == NULL ||
 153            qdev_get_vmsd(DEVICE(cpu))->unmigratable);
 154 #else
 155     if (qdev_get_vmsd(DEVICE(cpu)) == NULL) {
 156         vmstate_register(NULL, cpu->cpu_index, &vmstate_cpu_common, cpu);
 157     }
 158     if (cpu->cc->sysemu_ops->legacy_vmsd != NULL) {
 159         vmstate_register(NULL, cpu->cpu_index, cpu->cc->sysemu_ops->legacy_vmsd, cpu);
 160     }
 161 #endif /* CONFIG_USER_ONLY */
 162 }
 163
 164 void cpu_exec_unrealizefn(CPUState *cpu)
 165 {
 166 #ifndef CONFIG_USER_ONLY
 167     CPUClass *cc = CPU_GET_CLASS(cpu);
 168
 169     if (cc->sysemu_ops->legacy_vmsd != NULL) {
 170         vmstate_unregister(NULL, cc->sysemu_ops->legacy_vmsd, cpu);
 171     }
 172     if (qdev_get_vmsd(DEVICE(cpu)) == NULL) {
 173         vmstate_unregister(NULL, &vmstate_cpu_common, cpu);
 174     }
 175 #endif
 176
 177     /* Call the plugin hook before clearing cpu->cpu_index in cpu_list_remove */
 178     if (tcg_enabled()) {
 179         qemu_plugin_vcpu_exit_hook(cpu);
 180     }
 181
 182     cpu_list_remove(cpu);
 183     /*
 184      * Now that the vCPU has been removed from the RCU list, we can call
 185      * accel_cpu_common_unrealize, which may free fields using call_rcu.
 186      */
 187     accel_cpu_common_unrealize(cpu);
 188 }
 189
 190 /*
 191  * This can't go in hw/core/cpu.c because that file is compiled only
 192  * once for both user-mode and system builds.
 193  */
 194 static Property cpu_common_props[] = {
 195 #ifdef CONFIG_USER_ONLY
 196     /*
 197      * Create a property for the user-only object, so users can
 198      * adjust prctl(PR_SET_UNALIGN) from the command-line.
 199      * Has no effect if the target does not support the feature.
 200      */
 201     DEFINE_PROP_BOOL("prctl-unalign-sigbus", CPUState,
 202                      prctl_unalign_sigbus, false),
 203 #else
 204     /*
 205      * Create a memory property for system CPU object, so users can
 206      * wire up its memory.  The default if no link is set up is to use
 207      * the system address space.
 208      */
 209     DEFINE_PROP_LINK("memory", CPUState, memory, TYPE_MEMORY_REGION,
 210                      MemoryRegion *),
 211 #endif
 212     DEFINE_PROP_END_OF_LIST(),
 213 };
 214
 215 static bool cpu_get_start_powered_off(Object *obj, Error **errp)
 216 {
 217     CPUState *cpu = CPU(obj);
 218     return cpu->start_powered_off;
 219 }
 220
 221 static void cpu_set_start_powered_off(Object *obj, bool value, Error **errp)
 222 {
 223     CPUState *cpu = CPU(obj);
 224     cpu->start_powered_off = value;
 225 }
 226
 227 void cpu_class_init_props(DeviceClass *dc)
 228 {
 229     ObjectClass *oc = OBJECT_CLASS(dc);
 230
 231     device_class_set_props(dc, cpu_common_props);
 232     /*
 233      * We can't use DEFINE_PROP_BOOL in the Property array for this
 234      * property, because we want this to be settable after realize.
 235      */
 236     object_class_property_add_bool(oc, "start-powered-off",
 237                                    cpu_get_start_powered_off,
 238                                    cpu_set_start_powered_off);
 239 }
 240
 241 void cpu_exec_initfn(CPUState *cpu)
 242 {
 243     cpu->as = NULL;
 244     cpu->num_ases = 0;
 245
 246 #ifndef CONFIG_USER_ONLY
 247     cpu->thread_id = qemu_get_thread_id();
 248     cpu->memory = get_system_memory();
 249     object_ref(OBJECT(cpu->memory));
 250 #endif
 251 }
 252
 253 const char *parse_cpu_option(const char *cpu_option)
 254 {
 255     ObjectClass *oc;
 256     CPUClass *cc;
 257     gchar **model_pieces;
 258     const char *cpu_type;
 259
 260     model_pieces = g_strsplit(cpu_option, ",", 2);
 261     if (!model_pieces[0]) {
 262         error_report("-cpu option cannot be empty");
 263         exit(1);
 264     }
 265
 266     oc = cpu_class_by_name(CPU_RESOLVING_TYPE, model_pieces[0]);
 267     if (oc == NULL) {
 268         error_report("unable to find CPU model '%s'", model_pieces[0]);
 269         g_strfreev(model_pieces);
 270         exit(EXIT_FAILURE);
 271     }
 272
 273     cpu_type = object_class_get_name(oc);
 274     cc = CPU_CLASS(oc);
 275     cc->parse_features(cpu_type, model_pieces[1], &error_fatal);
 276     g_strfreev(model_pieces);
 277     return cpu_type;
 278 }
 279
 280 void list_cpus(void)
 281 {
 282     /* XXX: implement xxx_cpu_list for targets that still miss it */
 283 #if defined(cpu_list)
 284     cpu_list();
 285 #endif
 286 }
 287
 288 #if defined(CONFIG_USER_ONLY)
 289 void tb_invalidate_phys_addr(hwaddr addr)
 290 {
 291     mmap_lock();
 292     tb_invalidate_phys_page(addr);
 293     mmap_unlock();
 294 }
 295 #else
 296 void tb_invalidate_phys_addr(AddressSpace *as, hwaddr addr, MemTxAttrs attrs)
 297 {
 298     ram_addr_t ram_addr;
 299     MemoryRegion *mr;
 300     hwaddr l = 1;
 301
 302     if (!tcg_enabled()) {
 303         return;
 304     }
 305
 306     RCU_READ_LOCK_GUARD();
 307     mr = address_space_translate(as, addr, &addr, &l, false, attrs);
 308     if (!(memory_region_is_ram(mr)
 309           || memory_region_is_romd(mr))) {
 310         return;
 311     }
 312     ram_addr = memory_region_get_ram_addr(mr) + addr;
 313     tb_invalidate_phys_page(ram_addr);
 314 }
 315 #endif
 316
 317 /* enable or disable single step mode. EXCP_DEBUG is returned by the
 318    CPU loop after each instruction */
 319 void cpu_single_step(CPUState *cpu, int enabled)
 320 {
 321     if (cpu->singlestep_enabled != enabled) {
 322         cpu->singlestep_enabled = enabled;
 323
 324 #if !defined(CONFIG_USER_ONLY)
 325         const AccelOpsClass *ops = cpus_get_accel();
 326         if (ops->update_guest_debug) {
 327             ops->update_guest_debug(cpu);
 328         }
 329 #endif
 330
 331         trace_breakpoint_singlestep(cpu->cpu_index, enabled);
 332     }
 333 }
 334
 335 void cpu_abort(CPUState *cpu, const char *fmt, ...)
 336 {
 337     va_list ap;
 338     va_list ap2;
 339
 340     va_start(ap, fmt);
 341     va_copy(ap2, ap);
 342     fprintf(stderr, "qemu: fatal: ");
 343     vfprintf(stderr, fmt, ap);
 344     fprintf(stderr, "\n");
 345     cpu_dump_state(cpu, stderr, CPU_DUMP_FPU | CPU_DUMP_CCOP);
 346     if (qemu_log_separate()) {
 347         FILE *logfile = qemu_log_trylock();
 348         if (logfile) {
 349             fprintf(logfile, "qemu: fatal: ");
 350             vfprintf(logfile, fmt, ap2);
 351             fprintf(logfile, "\n");
 352             cpu_dump_state(cpu, logfile, CPU_DUMP_FPU | CPU_DUMP_CCOP);
 353             qemu_log_unlock(logfile);
 354         }
 355     }
 356     va_end(ap2);
 357     va_end(ap);
 358     replay_finish();
 359 #if defined(CONFIG_USER_ONLY)
 360     {
 361         struct sigaction act;
 362         sigfillset(&act.sa_mask);
 363         act.sa_handler = SIG_DFL;
 364         act.sa_flags = 0;
 365         sigaction(SIGABRT, &act, NULL);
 366     }
 367 #endif
 368     abort();
 369 }
 370
 371 /* physical memory access (slow version, mainly for debug) */
 372 #if defined(CONFIG_USER_ONLY)
 373 int cpu_memory_rw_debug(CPUState *cpu, vaddr addr,
 374                         void *ptr, size_t len, bool is_write)
 375 {
 376     int flags;
 377     vaddr l, page;
 378     void * p;
 379     uint8_t *buf = ptr;
 380
 381     while (len > 0) {
 382         page = addr & TARGET_PAGE_MASK;
 383         l = (page + TARGET_PAGE_SIZE) - addr;
 384         if (l > len)
 385             l = len;
 386         flags = page_get_flags(page);
 387         if (!(flags & PAGE_VALID))
 388             return -1;
 389         if (is_write) {
 390             if (!(flags & PAGE_WRITE))
 391                 return -1;
 392             /* XXX: this code should not depend on lock_user */
 393             if (!(p = lock_user(VERIFY_WRITE, addr, l, 0)))
 394                 return -1;
 395             memcpy(p, buf, l);
 396             unlock_user(p, addr, l);
 397         } else {
 398             if (!(flags & PAGE_READ))
 399                 return -1;
 400             /* XXX: this code should not depend on lock_user */
 401             if (!(p = lock_user(VERIFY_READ, addr, l, 1)))
 402                 return -1;
 403             memcpy(buf, p, l);
 404             unlock_user(p, addr, 0);
 405         }
 406         len -= l;
 407         buf += l;
 408         addr += l;
 409     }
 410     return 0;
 411 }
 412 #endif
 413
 414 bool target_words_bigendian(void)
 415 {
 416     return TARGET_BIG_ENDIAN;
 417 }
 418
 419 const char *target_name(void)
 420 {
 421     return TARGET_NAME;
 422 }
 423
 424 void page_size_init(void)
 425 {
 426     /* NOTE: we can always suppose that qemu_host_page_size >=
 427        TARGET_PAGE_SIZE */
 428     if (qemu_host_page_size == 0) {
 429         qemu_host_page_size = qemu_real_host_page_size();
 430     }
 431     if (qemu_host_page_size < TARGET_PAGE_SIZE) {
 432         qemu_host_page_size = TARGET_PAGE_SIZE;
 433     }
 434     qemu_host_page_mask = -(intptr_t)qemu_host_page_size;
 435 }