cpu.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 "qemu-common.h"
  22 #include "qapi/error.h"
  23
  24 #include "exec/target_page.h"
  25 #include "hw/qdev-core.h"
  26 #include "hw/qdev-properties.h"
  27 #include "qemu/error-report.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/tcg.h"
  36 #include "sysemu/kvm.h"
  37 #include "sysemu/replay.h"
  38 #include "exec/translate-all.h"
  39 #include "exec/log.h"
  40 #include "hw/core/accel-cpu.h"
  41 #include "trace/trace-root.h"
  42
  43 uintptr_t qemu_host_page_size;
  44 intptr_t qemu_host_page_mask;
  45
  46 #ifndef CONFIG_USER_ONLY
  47 static int cpu_common_post_load(void *opaque, int version_id)
  48 {
  49     CPUState *cpu = opaque;
  50
  51     /* 0x01 was CPU_INTERRUPT_EXIT. This line can be removed when the
  52        version_id is increased. */
  53     cpu->interrupt_request &= ~0x01;
  54     tlb_flush(cpu);
  55
  56     /* loadvm has just updated the content of RAM, bypassing the
  57      * usual mechanisms that ensure we flush TBs for writes to
  58      * memory we've translated code from. So we must flush all TBs,
  59      * which will now be stale.
  60      */
  61     tb_flush(cpu);
  62
  63     return 0;
  64 }
  65
  66 static int cpu_common_pre_load(void *opaque)
  67 {
  68     CPUState *cpu = opaque;
  69
  70     cpu->exception_index = -1;
  71
  72     return 0;
  73 }
  74
  75 static bool cpu_common_exception_index_needed(void *opaque)
  76 {
  77     CPUState *cpu = opaque;
  78
  79     return tcg_enabled() && cpu->exception_index != -1;
  80 }
  81
  82 static const VMStateDescription vmstate_cpu_common_exception_index = {
  83     .name = "cpu_common/exception_index",
  84     .version_id = 1,
  85     .minimum_version_id = 1,
  86     .needed = cpu_common_exception_index_needed,
  87     .fields = (VMStateField[]) {
  88         VMSTATE_INT32(exception_index, CPUState),
  89         VMSTATE_END_OF_LIST()
  90     }
  91 };
  92
  93 static bool cpu_common_crash_occurred_needed(void *opaque)
  94 {
  95     CPUState *cpu = opaque;
  96
  97     return cpu->crash_occurred;
  98 }
  99
 100 static const VMStateDescription vmstate_cpu_common_crash_occurred = {
 101     .name = "cpu_common/crash_occurred",
 102     .version_id = 1,
 103     .minimum_version_id = 1,
 104     .needed = cpu_common_crash_occurred_needed,
 105     .fields = (VMStateField[]) {
 106         VMSTATE_BOOL(crash_occurred, CPUState),
 107         VMSTATE_END_OF_LIST()
 108     }
 109 };
 110
 111 const VMStateDescription vmstate_cpu_common = {
 112     .name = "cpu_common",
 113     .version_id = 1,
 114     .minimum_version_id = 1,
 115     .pre_load = cpu_common_pre_load,
 116     .post_load = cpu_common_post_load,
 117     .fields = (VMStateField[]) {
 118         VMSTATE_UINT32(halted, CPUState),
 119         VMSTATE_UINT32(interrupt_request, CPUState),
 120         VMSTATE_END_OF_LIST()
 121     },
 122     .subsections = (const VMStateDescription*[]) {
 123         &vmstate_cpu_common_exception_index,
 124         &vmstate_cpu_common_crash_occurred,
 125         NULL
 126     }
 127 };
 128 #endif
 129
 130 void cpu_exec_realizefn(CPUState *cpu, Error **errp)
 131 {
 132 #ifndef CONFIG_USER_ONLY
 133     CPUClass *cc = CPU_GET_CLASS(cpu);
 134 #endif
 135
 136     cpu_list_add(cpu);
 137     if (!accel_cpu_realizefn(cpu, errp)) {
 138         return;
 139     }
 140     /* NB: errp parameter is unused currently */
 141     if (tcg_enabled()) {
 142         tcg_exec_realizefn(cpu, errp);
 143     }
 144
 145 #ifdef CONFIG_USER_ONLY
 146     assert(qdev_get_vmsd(DEVICE(cpu)) == NULL ||
 147            qdev_get_vmsd(DEVICE(cpu))->unmigratable);
 148 #else
 149     if (qdev_get_vmsd(DEVICE(cpu)) == NULL) {
 150         vmstate_register(NULL, cpu->cpu_index, &vmstate_cpu_common, cpu);
 151     }
 152     if (cc->sysemu_ops->legacy_vmsd != NULL) {
 153         vmstate_register(NULL, cpu->cpu_index, cc->sysemu_ops->legacy_vmsd, cpu);
 154     }
 155 #endif /* CONFIG_USER_ONLY */
 156 }
 157
 158 void cpu_exec_unrealizefn(CPUState *cpu)
 159 {
 160 #ifndef CONFIG_USER_ONLY
 161     CPUClass *cc = CPU_GET_CLASS(cpu);
 162
 163     if (cc->sysemu_ops->legacy_vmsd != NULL) {
 164         vmstate_unregister(NULL, cc->sysemu_ops->legacy_vmsd, cpu);
 165     }
 166     if (qdev_get_vmsd(DEVICE(cpu)) == NULL) {
 167         vmstate_unregister(NULL, &vmstate_cpu_common, cpu);
 168     }
 169 #endif
 170     if (tcg_enabled()) {
 171         tcg_exec_unrealizefn(cpu);
 172     }
 173
 174     cpu_list_remove(cpu);
 175 }
 176
 177 /*
 178  * This can't go in hw/core/cpu.c because that file is compiled only
 179  * once for both user-mode and system builds.
 180  */
 181 static Property cpu_common_props[] = {
 182 #ifdef CONFIG_USER_ONLY
 183     /*
 184      * Create a property for the user-only object, so users can
 185      * adjust prctl(PR_SET_UNALIGN) from the command-line.
 186      * Has no effect if the target does not support the feature.
 187      */
 188     DEFINE_PROP_BOOL("prctl-unalign-sigbus", CPUState,
 189                      prctl_unalign_sigbus, false),
 190 #else
 191     /*
 192      * Create a memory property for softmmu CPU object, so users can
 193      * wire up its memory.  The default if no link is set up is to use
 194      * the system address space.
 195      */
 196     DEFINE_PROP_LINK("memory", CPUState, memory, TYPE_MEMORY_REGION,
 197                      MemoryRegion *),
 198 #endif
 199     DEFINE_PROP_END_OF_LIST(),
 200 };
 201
 202 static bool cpu_get_start_powered_off(Object *obj, Error **errp)
 203 {
 204     CPUState *cpu = CPU(obj);
 205     return cpu->start_powered_off;
 206 }
 207
 208 static void cpu_set_start_powered_off(Object *obj, bool value, Error **errp)
 209 {
 210     CPUState *cpu = CPU(obj);
 211     cpu->start_powered_off = value;
 212 }
 213
 214 void cpu_class_init_props(DeviceClass *dc)
 215 {
 216     ObjectClass *oc = OBJECT_CLASS(dc);
 217
 218     device_class_set_props(dc, cpu_common_props);
 219     /*
 220      * We can't use DEFINE_PROP_BOOL in the Property array for this
 221      * property, because we want this to be settable after realize.
 222      */
 223     object_class_property_add_bool(oc, "start-powered-off",
 224                                    cpu_get_start_powered_off,
 225                                    cpu_set_start_powered_off);
 226 }
 227
 228 void cpu_exec_initfn(CPUState *cpu)
 229 {
 230     cpu->as = NULL;
 231     cpu->num_ases = 0;
 232
 233 #ifndef CONFIG_USER_ONLY
 234     cpu->thread_id = qemu_get_thread_id();
 235     cpu->memory = get_system_memory();
 236     object_ref(OBJECT(cpu->memory));
 237 #endif
 238 }
 239
 240 const char *parse_cpu_option(const char *cpu_option)
 241 {
 242     ObjectClass *oc;
 243     CPUClass *cc;
 244     gchar **model_pieces;
 245     const char *cpu_type;
 246
 247     model_pieces = g_strsplit(cpu_option, ",", 2);
 248     if (!model_pieces[0]) {
 249         error_report("-cpu option cannot be empty");
 250         exit(1);
 251     }
 252
 253     oc = cpu_class_by_name(CPU_RESOLVING_TYPE, model_pieces[0]);
 254     if (oc == NULL) {
 255         error_report("unable to find CPU model '%s'", model_pieces[0]);
 256         g_strfreev(model_pieces);
 257         exit(EXIT_FAILURE);
 258     }
 259
 260     cpu_type = object_class_get_name(oc);
 261     cc = CPU_CLASS(oc);
 262     cc->parse_features(cpu_type, model_pieces[1], &error_fatal);
 263     g_strfreev(model_pieces);
 264     return cpu_type;
 265 }
 266
 267 #if defined(CONFIG_USER_ONLY)
 268 void tb_invalidate_phys_addr(target_ulong addr)
 269 {
 270     mmap_lock();
 271     tb_invalidate_phys_page_range(addr, addr + 1);
 272     mmap_unlock();
 273 }
 274 #else
 275 void tb_invalidate_phys_addr(AddressSpace *as, hwaddr addr, MemTxAttrs attrs)
 276 {
 277     ram_addr_t ram_addr;
 278     MemoryRegion *mr;
 279     hwaddr l = 1;
 280
 281     if (!tcg_enabled()) {
 282         return;
 283     }
 284
 285     RCU_READ_LOCK_GUARD();
 286     mr = address_space_translate(as, addr, &addr, &l, false, attrs);
 287     if (!(memory_region_is_ram(mr)
 288           || memory_region_is_romd(mr))) {
 289         return;
 290     }
 291     ram_addr = memory_region_get_ram_addr(mr) + addr;
 292     tb_invalidate_phys_page_range(ram_addr, ram_addr + 1);
 293 }
 294 #endif
 295
 296 /* Add a breakpoint.  */
 297 int cpu_breakpoint_insert(CPUState *cpu, vaddr pc, int flags,
 298                           CPUBreakpoint **breakpoint)
 299 {
 300     CPUClass *cc = CPU_GET_CLASS(cpu);
 301     CPUBreakpoint *bp;
 302
 303     if (cc->gdb_adjust_breakpoint) {
 304         pc = cc->gdb_adjust_breakpoint(cpu, pc);
 305     }
 306
 307     bp = g_malloc(sizeof(*bp));
 308
 309     bp->pc = pc;
 310     bp->flags = flags;
 311
 312     /* keep all GDB-injected breakpoints in front */
 313     if (flags & BP_GDB) {
 314         QTAILQ_INSERT_HEAD(&cpu->breakpoints, bp, entry);
 315     } else {
 316         QTAILQ_INSERT_TAIL(&cpu->breakpoints, bp, entry);
 317     }
 318
 319     if (breakpoint) {
 320         *breakpoint = bp;
 321     }
 322
 323     trace_breakpoint_insert(cpu->cpu_index, pc, flags);
 324     return 0;
 325 }
 326
 327 /* Remove a specific breakpoint.  */
 328 int cpu_breakpoint_remove(CPUState *cpu, vaddr pc, int flags)
 329 {
 330     CPUClass *cc = CPU_GET_CLASS(cpu);
 331     CPUBreakpoint *bp;
 332
 333     if (cc->gdb_adjust_breakpoint) {
 334         pc = cc->gdb_adjust_breakpoint(cpu, pc);
 335     }
 336
 337     QTAILQ_FOREACH(bp, &cpu->breakpoints, entry) {
 338         if (bp->pc == pc && bp->flags == flags) {
 339             cpu_breakpoint_remove_by_ref(cpu, bp);
 340             return 0;
 341         }
 342     }
 343     return -ENOENT;
 344 }
 345
 346 /* Remove a specific breakpoint by reference.  */
 347 void cpu_breakpoint_remove_by_ref(CPUState *cpu, CPUBreakpoint *bp)
 348 {
 349     QTAILQ_REMOVE(&cpu->breakpoints, bp, entry);
 350
 351     trace_breakpoint_remove(cpu->cpu_index, bp->pc, bp->flags);
 352     g_free(bp);
 353 }
 354
 355 /* Remove all matching breakpoints. */
 356 void cpu_breakpoint_remove_all(CPUState *cpu, int mask)
 357 {
 358     CPUBreakpoint *bp, *next;
 359
 360     QTAILQ_FOREACH_SAFE(bp, &cpu->breakpoints, entry, next) {
 361         if (bp->flags & mask) {
 362             cpu_breakpoint_remove_by_ref(cpu, bp);
 363         }
 364     }
 365 }
 366
 367 /* enable or disable single step mode. EXCP_DEBUG is returned by the
 368    CPU loop after each instruction */
 369 void cpu_single_step(CPUState *cpu, int enabled)
 370 {
 371     if (cpu->singlestep_enabled != enabled) {
 372         cpu->singlestep_enabled = enabled;
 373         if (kvm_enabled()) {
 374             kvm_update_guest_debug(cpu, 0);
 375         }
 376         trace_breakpoint_singlestep(cpu->cpu_index, enabled);
 377     }
 378 }
 379
 380 void cpu_abort(CPUState *cpu, const char *fmt, ...)
 381 {
 382     va_list ap;
 383     va_list ap2;
 384
 385     va_start(ap, fmt);
 386     va_copy(ap2, ap);
 387     fprintf(stderr, "qemu: fatal: ");
 388     vfprintf(stderr, fmt, ap);
 389     fprintf(stderr, "\n");
 390     cpu_dump_state(cpu, stderr, CPU_DUMP_FPU | CPU_DUMP_CCOP);
 391     if (qemu_log_separate()) {
 392         FILE *logfile = qemu_log_lock();
 393         qemu_log("qemu: fatal: ");
 394         qemu_log_vprintf(fmt, ap2);
 395         qemu_log("\n");
 396         log_cpu_state(cpu, CPU_DUMP_FPU | CPU_DUMP_CCOP);
 397         qemu_log_flush();
 398         qemu_log_unlock(logfile);
 399         qemu_log_close();
 400     }
 401     va_end(ap2);
 402     va_end(ap);
 403     replay_finish();
 404 #if defined(CONFIG_USER_ONLY)
 405     {
 406         struct sigaction act;
 407         sigfillset(&act.sa_mask);
 408         act.sa_handler = SIG_DFL;
 409         act.sa_flags = 0;
 410         sigaction(SIGABRT, &act, NULL);
 411     }
 412 #endif
 413     abort();
 414 }
 415
 416 /* physical memory access (slow version, mainly for debug) */
 417 #if defined(CONFIG_USER_ONLY)
 418 int cpu_memory_rw_debug(CPUState *cpu, target_ulong addr,
 419                         void *ptr, target_ulong len, bool is_write)
 420 {
 421     int flags;
 422     target_ulong l, page;
 423     void * p;
 424     uint8_t *buf = ptr;
 425
 426     while (len > 0) {
 427         page = addr & TARGET_PAGE_MASK;
 428         l = (page + TARGET_PAGE_SIZE) - addr;
 429         if (l > len)
 430             l = len;
 431         flags = page_get_flags(page);
 432         if (!(flags & PAGE_VALID))
 433             return -1;
 434         if (is_write) {
 435             if (!(flags & PAGE_WRITE))
 436                 return -1;
 437             /* XXX: this code should not depend on lock_user */
 438             if (!(p = lock_user(VERIFY_WRITE, addr, l, 0)))
 439                 return -1;
 440             memcpy(p, buf, l);
 441             unlock_user(p, addr, l);
 442         } else {
 443             if (!(flags & PAGE_READ))
 444                 return -1;
 445             /* XXX: this code should not depend on lock_user */
 446             if (!(p = lock_user(VERIFY_READ, addr, l, 1)))
 447                 return -1;
 448             memcpy(buf, p, l);
 449             unlock_user(p, addr, 0);
 450         }
 451         len -= l;
 452         buf += l;
 453         addr += l;
 454     }
 455     return 0;
 456 }
 457 #endif
 458
 459 bool target_words_bigendian(void)
 460 {
 461 #if defined(TARGET_WORDS_BIGENDIAN)
 462     return true;
 463 #else
 464     return false;
 465 #endif
 466 }
 467
 468 void page_size_init(void)
 469 {
 470     /* NOTE: we can always suppose that qemu_host_page_size >=
 471        TARGET_PAGE_SIZE */
 472     if (qemu_host_page_size == 0) {
 473         qemu_host_page_size = qemu_real_host_page_size;
 474     }
 475     if (qemu_host_page_size < TARGET_PAGE_SIZE) {
 476         qemu_host_page_size = TARGET_PAGE_SIZE;
 477     }
 478     qemu_host_page_mask = -(intptr_t)qemu_host_page_size;
 479 }