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
  42 uintptr_t qemu_host_page_size;
  43 intptr_t qemu_host_page_mask;
  44
  45 #ifndef CONFIG_USER_ONLY
  46 static int cpu_common_post_load(void *opaque, int version_id)
  47 {
  48     CPUState *cpu = opaque;
  49
  50     /* 0x01 was CPU_INTERRUPT_EXIT. This line can be removed when the
  51        version_id is increased. */
  52     cpu->interrupt_request &= ~0x01;
  53     tlb_flush(cpu);
  54
  55     /* loadvm has just updated the content of RAM, bypassing the
  56      * usual mechanisms that ensure we flush TBs for writes to
  57      * memory we've translated code from. So we must flush all TBs,
  58      * which will now be stale.
  59      */
  60     tb_flush(cpu);
  61
  62     return 0;
  63 }
  64
  65 static int cpu_common_pre_load(void *opaque)
  66 {
  67     CPUState *cpu = opaque;
  68
  69     cpu->exception_index = -1;
  70
  71     return 0;
  72 }
  73
  74 static bool cpu_common_exception_index_needed(void *opaque)
  75 {
  76     CPUState *cpu = opaque;
  77
  78     return tcg_enabled() && cpu->exception_index != -1;
  79 }
  80
  81 static const VMStateDescription vmstate_cpu_common_exception_index = {
  82     .name = "cpu_common/exception_index",
  83     .version_id = 1,
  84     .minimum_version_id = 1,
  85     .needed = cpu_common_exception_index_needed,
  86     .fields = (VMStateField[]) {
  87         VMSTATE_INT32(exception_index, CPUState),
  88         VMSTATE_END_OF_LIST()
  89     }
  90 };
  91
  92 static bool cpu_common_crash_occurred_needed(void *opaque)
  93 {
  94     CPUState *cpu = opaque;
  95
  96     return cpu->crash_occurred;
  97 }
  98
  99 static const VMStateDescription vmstate_cpu_common_crash_occurred = {
 100     .name = "cpu_common/crash_occurred",
 101     .version_id = 1,
 102     .minimum_version_id = 1,
 103     .needed = cpu_common_crash_occurred_needed,
 104     .fields = (VMStateField[]) {
 105         VMSTATE_BOOL(crash_occurred, CPUState),
 106         VMSTATE_END_OF_LIST()
 107     }
 108 };
 109
 110 const VMStateDescription vmstate_cpu_common = {
 111     .name = "cpu_common",
 112     .version_id = 1,
 113     .minimum_version_id = 1,
 114     .pre_load = cpu_common_pre_load,
 115     .post_load = cpu_common_post_load,
 116     .fields = (VMStateField[]) {
 117         VMSTATE_UINT32(halted, CPUState),
 118         VMSTATE_UINT32(interrupt_request, CPUState),
 119         VMSTATE_END_OF_LIST()
 120     },
 121     .subsections = (const VMStateDescription*[]) {
 122         &vmstate_cpu_common_exception_index,
 123         &vmstate_cpu_common_crash_occurred,
 124         NULL
 125     }
 126 };
 127 #endif
 128
 129 void cpu_exec_realizefn(CPUState *cpu, Error **errp)
 130 {
 131 #ifndef CONFIG_USER_ONLY
 132     CPUClass *cc = CPU_GET_CLASS(cpu);
 133 #endif
 134
 135     cpu_list_add(cpu);
 136     if (!accel_cpu_realizefn(cpu, errp)) {
 137         return;
 138     }
 139 #ifdef CONFIG_TCG
 140     /* NB: errp parameter is unused currently */
 141     if (tcg_enabled()) {
 142         tcg_exec_realizefn(cpu, errp);
 143     }
 144 #endif /* CONFIG_TCG */
 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 (cc->sysemu_ops->legacy_vmsd != NULL) {
 154         vmstate_register(NULL, cpu->cpu_index, cc->sysemu_ops->legacy_vmsd, cpu);
 155     }
 156 #endif /* CONFIG_USER_ONLY */
 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 #ifdef CONFIG_TCG
 172     /* NB: errp parameter is unused currently */
 173     if (tcg_enabled()) {
 174         tcg_exec_unrealizefn(cpu);
 175     }
 176 #endif /* CONFIG_TCG */
 177
 178     cpu_list_remove(cpu);
 179 }
 180
 181 void cpu_exec_initfn(CPUState *cpu)
 182 {
 183     cpu->as = NULL;
 184     cpu->num_ases = 0;
 185
 186 #ifndef CONFIG_USER_ONLY
 187     cpu->thread_id = qemu_get_thread_id();
 188     cpu->memory = get_system_memory();
 189     object_ref(OBJECT(cpu->memory));
 190 #endif
 191 }
 192
 193 const char *parse_cpu_option(const char *cpu_option)
 194 {
 195     ObjectClass *oc;
 196     CPUClass *cc;
 197     gchar **model_pieces;
 198     const char *cpu_type;
 199
 200     model_pieces = g_strsplit(cpu_option, ",", 2);
 201     if (!model_pieces[0]) {
 202         error_report("-cpu option cannot be empty");
 203         exit(1);
 204     }
 205
 206     oc = cpu_class_by_name(CPU_RESOLVING_TYPE, model_pieces[0]);
 207     if (oc == NULL) {
 208         error_report("unable to find CPU model '%s'", model_pieces[0]);
 209         g_strfreev(model_pieces);
 210         exit(EXIT_FAILURE);
 211     }
 212
 213     cpu_type = object_class_get_name(oc);
 214     cc = CPU_CLASS(oc);
 215     cc->parse_features(cpu_type, model_pieces[1], &error_fatal);
 216     g_strfreev(model_pieces);
 217     return cpu_type;
 218 }
 219
 220 #if defined(CONFIG_USER_ONLY)
 221 void tb_invalidate_phys_addr(target_ulong addr)
 222 {
 223     mmap_lock();
 224     tb_invalidate_phys_page_range(addr, addr + 1);
 225     mmap_unlock();
 226 }
 227
 228 static void breakpoint_invalidate(CPUState *cpu, target_ulong pc)
 229 {
 230     tb_invalidate_phys_addr(pc);
 231 }
 232 #else
 233 void tb_invalidate_phys_addr(AddressSpace *as, hwaddr addr, MemTxAttrs attrs)
 234 {
 235     ram_addr_t ram_addr;
 236     MemoryRegion *mr;
 237     hwaddr l = 1;
 238
 239     if (!tcg_enabled()) {
 240         return;
 241     }
 242
 243     RCU_READ_LOCK_GUARD();
 244     mr = address_space_translate(as, addr, &addr, &l, false, attrs);
 245     if (!(memory_region_is_ram(mr)
 246           || memory_region_is_romd(mr))) {
 247         return;
 248     }
 249     ram_addr = memory_region_get_ram_addr(mr) + addr;
 250     tb_invalidate_phys_page_range(ram_addr, ram_addr + 1);
 251 }
 252
 253 static void breakpoint_invalidate(CPUState *cpu, target_ulong pc)
 254 {
 255     /*
 256      * There may not be a virtual to physical translation for the pc
 257      * right now, but there may exist cached TB for this pc.
 258      * Flush the whole TB cache to force re-translation of such TBs.
 259      * This is heavyweight, but we're debugging anyway.
 260      */
 261     tb_flush(cpu);
 262 }
 263 #endif
 264
 265 /* Add a breakpoint.  */
 266 int cpu_breakpoint_insert(CPUState *cpu, vaddr pc, int flags,
 267                           CPUBreakpoint **breakpoint)
 268 {
 269     CPUBreakpoint *bp;
 270
 271     bp = g_malloc(sizeof(*bp));
 272
 273     bp->pc = pc;
 274     bp->flags = flags;
 275
 276     /* keep all GDB-injected breakpoints in front */
 277     if (flags & BP_GDB) {
 278         QTAILQ_INSERT_HEAD(&cpu->breakpoints, bp, entry);
 279     } else {
 280         QTAILQ_INSERT_TAIL(&cpu->breakpoints, bp, entry);
 281     }
 282
 283     breakpoint_invalidate(cpu, pc);
 284
 285     if (breakpoint) {
 286         *breakpoint = bp;
 287     }
 288     return 0;
 289 }
 290
 291 /* Remove a specific breakpoint.  */
 292 int cpu_breakpoint_remove(CPUState *cpu, vaddr pc, int flags)
 293 {
 294     CPUBreakpoint *bp;
 295
 296     QTAILQ_FOREACH(bp, &cpu->breakpoints, entry) {
 297         if (bp->pc == pc && bp->flags == flags) {
 298             cpu_breakpoint_remove_by_ref(cpu, bp);
 299             return 0;
 300         }
 301     }
 302     return -ENOENT;
 303 }
 304
 305 /* Remove a specific breakpoint by reference.  */
 306 void cpu_breakpoint_remove_by_ref(CPUState *cpu, CPUBreakpoint *breakpoint)
 307 {
 308     QTAILQ_REMOVE(&cpu->breakpoints, breakpoint, entry);
 309
 310     breakpoint_invalidate(cpu, breakpoint->pc);
 311
 312     g_free(breakpoint);
 313 }
 314
 315 /* Remove all matching breakpoints. */
 316 void cpu_breakpoint_remove_all(CPUState *cpu, int mask)
 317 {
 318     CPUBreakpoint *bp, *next;
 319
 320     QTAILQ_FOREACH_SAFE(bp, &cpu->breakpoints, entry, next) {
 321         if (bp->flags & mask) {
 322             cpu_breakpoint_remove_by_ref(cpu, bp);
 323         }
 324     }
 325 }
 326
 327 /* enable or disable single step mode. EXCP_DEBUG is returned by the
 328    CPU loop after each instruction */
 329 void cpu_single_step(CPUState *cpu, int enabled)
 330 {
 331     if (cpu->singlestep_enabled != enabled) {
 332         cpu->singlestep_enabled = enabled;
 333         if (kvm_enabled()) {
 334             kvm_update_guest_debug(cpu, 0);
 335         } else {
 336             /* must flush all the translated code to avoid inconsistencies */
 337             /* XXX: only flush what is necessary */
 338             tb_flush(cpu);
 339         }
 340     }
 341 }
 342
 343 void cpu_abort(CPUState *cpu, const char *fmt, ...)
 344 {
 345     va_list ap;
 346     va_list ap2;
 347
 348     va_start(ap, fmt);
 349     va_copy(ap2, ap);
 350     fprintf(stderr, "qemu: fatal: ");
 351     vfprintf(stderr, fmt, ap);
 352     fprintf(stderr, "\n");
 353     cpu_dump_state(cpu, stderr, CPU_DUMP_FPU | CPU_DUMP_CCOP);
 354     if (qemu_log_separate()) {
 355         FILE *logfile = qemu_log_lock();
 356         qemu_log("qemu: fatal: ");
 357         qemu_log_vprintf(fmt, ap2);
 358         qemu_log("\n");
 359         log_cpu_state(cpu, CPU_DUMP_FPU | CPU_DUMP_CCOP);
 360         qemu_log_flush();
 361         qemu_log_unlock(logfile);
 362         qemu_log_close();
 363     }
 364     va_end(ap2);
 365     va_end(ap);
 366     replay_finish();
 367 #if defined(CONFIG_USER_ONLY)
 368     {
 369         struct sigaction act;
 370         sigfillset(&act.sa_mask);
 371         act.sa_handler = SIG_DFL;
 372         act.sa_flags = 0;
 373         sigaction(SIGABRT, &act, NULL);
 374     }
 375 #endif
 376     abort();
 377 }
 378
 379 /* physical memory access (slow version, mainly for debug) */
 380 #if defined(CONFIG_USER_ONLY)
 381 int cpu_memory_rw_debug(CPUState *cpu, target_ulong addr,
 382                         void *ptr, target_ulong len, bool is_write)
 383 {
 384     int flags;
 385     target_ulong l, page;
 386     void * p;
 387     uint8_t *buf = ptr;
 388
 389     while (len > 0) {
 390         page = addr & TARGET_PAGE_MASK;
 391         l = (page + TARGET_PAGE_SIZE) - addr;
 392         if (l > len)
 393             l = len;
 394         flags = page_get_flags(page);
 395         if (!(flags & PAGE_VALID))
 396             return -1;
 397         if (is_write) {
 398             if (!(flags & PAGE_WRITE))
 399                 return -1;
 400             /* XXX: this code should not depend on lock_user */
 401             if (!(p = lock_user(VERIFY_WRITE, addr, l, 0)))
 402                 return -1;
 403             memcpy(p, buf, l);
 404             unlock_user(p, addr, l);
 405         } else {
 406             if (!(flags & PAGE_READ))
 407                 return -1;
 408             /* XXX: this code should not depend on lock_user */
 409             if (!(p = lock_user(VERIFY_READ, addr, l, 1)))
 410                 return -1;
 411             memcpy(buf, p, l);
 412             unlock_user(p, addr, 0);
 413         }
 414         len -= l;
 415         buf += l;
 416         addr += l;
 417     }
 418     return 0;
 419 }
 420 #endif
 421
 422 bool target_words_bigendian(void)
 423 {
 424 #if defined(TARGET_WORDS_BIGENDIAN)
 425     return true;
 426 #else
 427     return false;
 428 #endif
 429 }
 430
 431 void page_size_init(void)
 432 {
 433     /* NOTE: we can always suppose that qemu_host_page_size >=
 434        TARGET_PAGE_SIZE */
 435     if (qemu_host_page_size == 0) {
 436         qemu_host_page_size = qemu_real_host_page_size;
 437     }
 438     if (qemu_host_page_size < TARGET_PAGE_SIZE) {
 439         qemu_host_page_size = TARGET_PAGE_SIZE;
 440     }
 441     qemu_host_page_mask = -(intptr_t)qemu_host_page_size;
 442 }