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
  46 uintptr_t qemu_host_page_size;
  47 intptr_t qemu_host_page_mask;
  48
  49 #ifndef CONFIG_USER_ONLY
  50 static int cpu_common_post_load(void *opaque, int version_id)
  51 {
  52     CPUState *cpu = opaque;
  53
  54     /* 0x01 was CPU_INTERRUPT_EXIT. This line can be removed when the
  55        version_id is increased. */
  56     cpu->interrupt_request &= ~0x01;
  57     tlb_flush(cpu);
  58
  59     /* loadvm has just updated the content of RAM, bypassing the
  60      * usual mechanisms that ensure we flush TBs for writes to
  61      * memory we've translated code from. So we must flush all TBs,
  62      * which will now be stale.
  63      */
  64     tb_flush(cpu);
  65
  66     return 0;
  67 }
  68
  69 static int cpu_common_pre_load(void *opaque)
  70 {
  71     CPUState *cpu = opaque;
  72
  73     cpu->exception_index = -1;
  74
  75     return 0;
  76 }
  77
  78 static bool cpu_common_exception_index_needed(void *opaque)
  79 {
  80     CPUState *cpu = opaque;
  81
  82     return tcg_enabled() && cpu->exception_index != -1;
  83 }
  84
  85 static const VMStateDescription vmstate_cpu_common_exception_index = {
  86     .name = "cpu_common/exception_index",
  87     .version_id = 1,
  88     .minimum_version_id = 1,
  89     .needed = cpu_common_exception_index_needed,
  90     .fields = (VMStateField[]) {
  91         VMSTATE_INT32(exception_index, CPUState),
  92         VMSTATE_END_OF_LIST()
  93     }
  94 };
  95
  96 static bool cpu_common_crash_occurred_needed(void *opaque)
  97 {
  98     CPUState *cpu = opaque;
  99
 100     return cpu->crash_occurred;
 101 }
 102
 103 static const VMStateDescription vmstate_cpu_common_crash_occurred = {
 104     .name = "cpu_common/crash_occurred",
 105     .version_id = 1,
 106     .minimum_version_id = 1,
 107     .needed = cpu_common_crash_occurred_needed,
 108     .fields = (VMStateField[]) {
 109         VMSTATE_BOOL(crash_occurred, CPUState),
 110         VMSTATE_END_OF_LIST()
 111     }
 112 };
 113
 114 const VMStateDescription vmstate_cpu_common = {
 115     .name = "cpu_common",
 116     .version_id = 1,
 117     .minimum_version_id = 1,
 118     .pre_load = cpu_common_pre_load,
 119     .post_load = cpu_common_post_load,
 120     .fields = (VMStateField[]) {
 121         VMSTATE_UINT32(halted, CPUState),
 122         VMSTATE_UINT32(interrupt_request, CPUState),
 123         VMSTATE_END_OF_LIST()
 124     },
 125     .subsections = (const VMStateDescription*[]) {
 126         &vmstate_cpu_common_exception_index,
 127         &vmstate_cpu_common_crash_occurred,
 128         NULL
 129     }
 130 };
 131 #endif
 132
 133 bool cpu_exec_realizefn(CPUState *cpu, Error **errp)
 134 {
 135     /* cache the cpu class for the hotpath */
 136     cpu->cc = CPU_GET_CLASS(cpu);
 137
 138     if (!accel_cpu_common_realize(cpu, errp)) {
 139         return false;
 140     }
 141
 142     /* Wait until cpu initialization complete before exposing cpu. */
 143     cpu_list_add(cpu);
 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 (cpu->cc->sysemu_ops->legacy_vmsd != NULL) {
 153         vmstate_register(NULL, cpu->cpu_index, cpu->cc->sysemu_ops->legacy_vmsd, cpu);
 154     }
 155 #endif /* CONFIG_USER_ONLY */
 156
 157     return true;
 158 }
 159
 160 void cpu_exec_unrealizefn(CPUState *cpu)
 161 {
 162 #ifndef CONFIG_USER_ONLY
 163     CPUClass *cc = CPU_GET_CLASS(cpu);
 164
 165     if (cc->sysemu_ops->legacy_vmsd != NULL) {
 166         vmstate_unregister(NULL, cc->sysemu_ops->legacy_vmsd, cpu);
 167     }
 168     if (qdev_get_vmsd(DEVICE(cpu)) == NULL) {
 169         vmstate_unregister(NULL, &vmstate_cpu_common, cpu);
 170     }
 171 #endif
 172
 173     cpu_list_remove(cpu);
 174     /*
 175      * Now that the vCPU has been removed from the RCU list, we can call
 176      * accel_cpu_common_unrealize, which may free fields using call_rcu.
 177      */
 178     accel_cpu_common_unrealize(cpu);
 179 }
 180
 181 /*
 182  * This can't go in hw/core/cpu.c because that file is compiled only
 183  * once for both user-mode and system builds.
 184  */
 185 static Property cpu_common_props[] = {
 186 #ifdef CONFIG_USER_ONLY
 187     /*
 188      * Create a property for the user-only object, so users can
 189      * adjust prctl(PR_SET_UNALIGN) from the command-line.
 190      * Has no effect if the target does not support the feature.
 191      */
 192     DEFINE_PROP_BOOL("prctl-unalign-sigbus", CPUState,
 193                      prctl_unalign_sigbus, false),
 194 #else
 195     /*
 196      * Create a memory property for system CPU object, so users can
 197      * wire up its memory.  The default if no link is set up is to use
 198      * the system address space.
 199      */
 200     DEFINE_PROP_LINK("memory", CPUState, memory, TYPE_MEMORY_REGION,
 201                      MemoryRegion *),
 202 #endif
 203     DEFINE_PROP_END_OF_LIST(),
 204 };
 205
 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
 218 void cpu_class_init_props(DeviceClass *dc)
 219 {
 220     ObjectClass *oc = OBJECT_CLASS(dc);
 221
 222     device_class_set_props(dc, cpu_common_props);
 223     /*
 224      * We can't use DEFINE_PROP_BOOL in the Property array for this
 225      * property, because we want this to be settable after realize.
 226      */
 227     object_class_property_add_bool(oc, "start-powered-off",
 228                                    cpu_get_start_powered_off,
 229                                    cpu_set_start_powered_off);
 230 }
 231
 232 void cpu_exec_initfn(CPUState *cpu)
 233 {
 234     cpu->as = NULL;
 235     cpu->num_ases = 0;
 236
 237 #ifndef CONFIG_USER_ONLY
 238     cpu->thread_id = qemu_get_thread_id();
 239     cpu->memory = get_system_memory();
 240     object_ref(OBJECT(cpu->memory));
 241 #endif
 242 }
 243
 244 const char *parse_cpu_option(const char *cpu_option)
 245 {
 246     ObjectClass *oc;
 247     CPUClass *cc;
 248     gchar **model_pieces;
 249     const char *cpu_type;
 250
 251     model_pieces = g_strsplit(cpu_option, ",", 2);
 252     if (!model_pieces[0]) {
 253         error_report("-cpu option cannot be empty");
 254         exit(1);
 255     }
 256
 257     oc = cpu_class_by_name(CPU_RESOLVING_TYPE, model_pieces[0]);
 258     if (oc == NULL) {
 259         error_report("unable to find CPU model '%s'", model_pieces[0]);
 260         g_strfreev(model_pieces);
 261         exit(EXIT_FAILURE);
 262     }
 263
 264     cpu_type = object_class_get_name(oc);
 265     cc = CPU_CLASS(oc);
 266     cc->parse_features(cpu_type, model_pieces[1], &error_fatal);
 267     g_strfreev(model_pieces);
 268     return cpu_type;
 269 }
 270
 271 void list_cpus(void)
 272 {
 273     /* XXX: implement xxx_cpu_list for targets that still miss it */
 274 #if defined(cpu_list)
 275     cpu_list();
 276 #endif
 277 }
 278
 279 #if defined(CONFIG_USER_ONLY)
 280 void tb_invalidate_phys_addr(hwaddr addr)
 281 {
 282     mmap_lock();
 283     tb_invalidate_phys_page(addr);
 284     mmap_unlock();
 285 }
 286 #else
 287 void tb_invalidate_phys_addr(AddressSpace *as, hwaddr addr, MemTxAttrs attrs)
 288 {
 289     ram_addr_t ram_addr;
 290     MemoryRegion *mr;
 291     hwaddr l = 1;
 292
 293     if (!tcg_enabled()) {
 294         return;
 295     }
 296
 297     RCU_READ_LOCK_GUARD();
 298     mr = address_space_translate(as, addr, &addr, &l, false, attrs);
 299     if (!(memory_region_is_ram(mr)
 300           || memory_region_is_romd(mr))) {
 301         return;
 302     }
 303     ram_addr = memory_region_get_ram_addr(mr) + addr;
 304     tb_invalidate_phys_page(ram_addr);
 305 }
 306 #endif
 307
 308 /* enable or disable single step mode. EXCP_DEBUG is returned by the
 309    CPU loop after each instruction */
 310 void cpu_single_step(CPUState *cpu, int enabled)
 311 {
 312     if (cpu->singlestep_enabled != enabled) {
 313         cpu->singlestep_enabled = enabled;
 314
 315 #if !defined(CONFIG_USER_ONLY)
 316         const AccelOpsClass *ops = cpus_get_accel();
 317         if (ops->update_guest_debug) {
 318             ops->update_guest_debug(cpu);
 319         }
 320 #endif
 321
 322         trace_breakpoint_singlestep(cpu->cpu_index, enabled);
 323     }
 324 }
 325
 326 void cpu_abort(CPUState *cpu, const char *fmt, ...)
 327 {
 328     va_list ap;
 329     va_list ap2;
 330
 331     va_start(ap, fmt);
 332     va_copy(ap2, ap);
 333     fprintf(stderr, "qemu: fatal: ");
 334     vfprintf(stderr, fmt, ap);
 335     fprintf(stderr, "\n");
 336     cpu_dump_state(cpu, stderr, CPU_DUMP_FPU | CPU_DUMP_CCOP);
 337     if (qemu_log_separate()) {
 338         FILE *logfile = qemu_log_trylock();
 339         if (logfile) {
 340             fprintf(logfile, "qemu: fatal: ");
 341             vfprintf(logfile, fmt, ap2);
 342             fprintf(logfile, "\n");
 343             cpu_dump_state(cpu, logfile, CPU_DUMP_FPU | CPU_DUMP_CCOP);
 344             qemu_log_unlock(logfile);
 345         }
 346     }
 347     va_end(ap2);
 348     va_end(ap);
 349     replay_finish();
 350 #if defined(CONFIG_USER_ONLY)
 351     {
 352         struct sigaction act;
 353         sigfillset(&act.sa_mask);
 354         act.sa_handler = SIG_DFL;
 355         act.sa_flags = 0;
 356         sigaction(SIGABRT, &act, NULL);
 357     }
 358 #endif
 359     abort();
 360 }
 361
 362 /* physical memory access (slow version, mainly for debug) */
 363 #if defined(CONFIG_USER_ONLY)
 364 int cpu_memory_rw_debug(CPUState *cpu, vaddr addr,
 365                         void *ptr, size_t len, bool is_write)
 366 {
 367     int flags;
 368     vaddr l, page;
 369     void * p;
 370     uint8_t *buf = ptr;
 371
 372     while (len > 0) {
 373         page = addr & TARGET_PAGE_MASK;
 374         l = (page + TARGET_PAGE_SIZE) - addr;
 375         if (l > len)
 376             l = len;
 377         flags = page_get_flags(page);
 378         if (!(flags & PAGE_VALID))
 379             return -1;
 380         if (is_write) {
 381             if (!(flags & PAGE_WRITE))
 382                 return -1;
 383             /* XXX: this code should not depend on lock_user */
 384             if (!(p = lock_user(VERIFY_WRITE, addr, l, 0)))
 385                 return -1;
 386             memcpy(p, buf, l);
 387             unlock_user(p, addr, l);
 388         } else {
 389             if (!(flags & PAGE_READ))
 390                 return -1;
 391             /* XXX: this code should not depend on lock_user */
 392             if (!(p = lock_user(VERIFY_READ, addr, l, 1)))
 393                 return -1;
 394             memcpy(buf, p, l);
 395             unlock_user(p, addr, 0);
 396         }
 397         len -= l;
 398         buf += l;
 399         addr += l;
 400     }
 401     return 0;
 402 }
 403 #endif
 404
 405 bool target_words_bigendian(void)
 406 {
 407     return TARGET_BIG_ENDIAN;
 408 }
 409
 410 const char *target_name(void)
 411 {
 412     return TARGET_NAME;
 413 }
 414
 415 void page_size_init(void)
 416 {
 417     /* NOTE: we can always suppose that qemu_host_page_size >=
 418        TARGET_PAGE_SIZE */
 419     if (qemu_host_page_size == 0) {
 420         qemu_host_page_size = qemu_real_host_page_size();
 421     }
 422     if (qemu_host_page_size < TARGET_PAGE_SIZE) {
 423         qemu_host_page_size = TARGET_PAGE_SIZE;
 424     }
 425     qemu_host_page_mask = -(intptr_t)qemu_host_page_size;
 426 }