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 #ifdef CONFIG_TCG
 141     /* NB: errp parameter is unused currently */
 142     if (tcg_enabled()) {
 143         tcg_exec_realizefn(cpu, errp);
 144     }
 145 #endif /* CONFIG_TCG */
 146
 147 #ifdef CONFIG_USER_ONLY
 148     assert(qdev_get_vmsd(DEVICE(cpu)) == NULL ||
 149            qdev_get_vmsd(DEVICE(cpu))->unmigratable);
 150 #else
 151     if (qdev_get_vmsd(DEVICE(cpu)) == NULL) {
 152         vmstate_register(NULL, cpu->cpu_index, &vmstate_cpu_common, cpu);
 153     }
 154     if (cc->sysemu_ops->legacy_vmsd != NULL) {
 155         vmstate_register(NULL, cpu->cpu_index, cc->sysemu_ops->legacy_vmsd, cpu);
 156     }
 157 #endif /* CONFIG_USER_ONLY */
 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 #ifdef CONFIG_TCG
 173     /* NB: errp parameter is unused currently */
 174     if (tcg_enabled()) {
 175         tcg_exec_unrealizefn(cpu);
 176     }
 177 #endif /* CONFIG_TCG */
 178
 179     cpu_list_remove(cpu);
 180 }
 181
 182 void cpu_exec_initfn(CPUState *cpu)
 183 {
 184     cpu->as = NULL;
 185     cpu->num_ases = 0;
 186
 187 #ifndef CONFIG_USER_ONLY
 188     cpu->thread_id = qemu_get_thread_id();
 189     cpu->memory = get_system_memory();
 190     object_ref(OBJECT(cpu->memory));
 191 #endif
 192 }
 193
 194 const char *parse_cpu_option(const char *cpu_option)
 195 {
 196     ObjectClass *oc;
 197     CPUClass *cc;
 198     gchar **model_pieces;
 199     const char *cpu_type;
 200
 201     model_pieces = g_strsplit(cpu_option, ",", 2);
 202     if (!model_pieces[0]) {
 203         error_report("-cpu option cannot be empty");
 204         exit(1);
 205     }
 206
 207     oc = cpu_class_by_name(CPU_RESOLVING_TYPE, model_pieces[0]);
 208     if (oc == NULL) {
 209         error_report("unable to find CPU model '%s'", model_pieces[0]);
 210         g_strfreev(model_pieces);
 211         exit(EXIT_FAILURE);
 212     }
 213
 214     cpu_type = object_class_get_name(oc);
 215     cc = CPU_CLASS(oc);
 216     cc->parse_features(cpu_type, model_pieces[1], &error_fatal);
 217     g_strfreev(model_pieces);
 218     return cpu_type;
 219 }
 220
 221 #if defined(CONFIG_USER_ONLY)
 222 void tb_invalidate_phys_addr(target_ulong addr)
 223 {
 224     mmap_lock();
 225     tb_invalidate_phys_page_range(addr, addr + 1);
 226     mmap_unlock();
 227 }
 228
 229 static void breakpoint_invalidate(CPUState *cpu, target_ulong pc)
 230 {
 231     tb_invalidate_phys_addr(pc);
 232 }
 233 #else
 234 void tb_invalidate_phys_addr(AddressSpace *as, hwaddr addr, MemTxAttrs attrs)
 235 {
 236     ram_addr_t ram_addr;
 237     MemoryRegion *mr;
 238     hwaddr l = 1;
 239
 240     if (!tcg_enabled()) {
 241         return;
 242     }
 243
 244     RCU_READ_LOCK_GUARD();
 245     mr = address_space_translate(as, addr, &addr, &l, false, attrs);
 246     if (!(memory_region_is_ram(mr)
 247           || memory_region_is_romd(mr))) {
 248         return;
 249     }
 250     ram_addr = memory_region_get_ram_addr(mr) + addr;
 251     tb_invalidate_phys_page_range(ram_addr, ram_addr + 1);
 252 }
 253
 254 static void breakpoint_invalidate(CPUState *cpu, target_ulong pc)
 255 {
 256     /*
 257      * There may not be a virtual to physical translation for the pc
 258      * right now, but there may exist cached TB for this pc.
 259      * Flush the whole TB cache to force re-translation of such TBs.
 260      * This is heavyweight, but we're debugging anyway.
 261      */
 262     tb_flush(cpu);
 263 }
 264 #endif
 265
 266 /* Add a breakpoint.  */
 267 int cpu_breakpoint_insert(CPUState *cpu, vaddr pc, int flags,
 268                           CPUBreakpoint **breakpoint)
 269 {
 270     CPUBreakpoint *bp;
 271
 272     bp = g_malloc(sizeof(*bp));
 273
 274     bp->pc = pc;
 275     bp->flags = flags;
 276
 277     /* keep all GDB-injected breakpoints in front */
 278     if (flags & BP_GDB) {
 279         QTAILQ_INSERT_HEAD(&cpu->breakpoints, bp, entry);
 280     } else {
 281         QTAILQ_INSERT_TAIL(&cpu->breakpoints, bp, entry);
 282     }
 283
 284     breakpoint_invalidate(cpu, pc);
 285
 286     if (breakpoint) {
 287         *breakpoint = bp;
 288     }
 289
 290     trace_breakpoint_insert(cpu->cpu_index, pc, flags);
 291     return 0;
 292 }
 293
 294 /* Remove a specific breakpoint.  */
 295 int cpu_breakpoint_remove(CPUState *cpu, vaddr pc, int flags)
 296 {
 297     CPUBreakpoint *bp;
 298
 299     QTAILQ_FOREACH(bp, &cpu->breakpoints, entry) {
 300         if (bp->pc == pc && bp->flags == flags) {
 301             cpu_breakpoint_remove_by_ref(cpu, bp);
 302             return 0;
 303         }
 304     }
 305     return -ENOENT;
 306 }
 307
 308 /* Remove a specific breakpoint by reference.  */
 309 void cpu_breakpoint_remove_by_ref(CPUState *cpu, CPUBreakpoint *bp)
 310 {
 311     QTAILQ_REMOVE(&cpu->breakpoints, bp, entry);
 312
 313     breakpoint_invalidate(cpu, bp->pc);
 314
 315     trace_breakpoint_remove(cpu->cpu_index, bp->pc, bp->flags);
 316     g_free(bp);
 317 }
 318
 319 /* Remove all matching breakpoints. */
 320 void cpu_breakpoint_remove_all(CPUState *cpu, int mask)
 321 {
 322     CPUBreakpoint *bp, *next;
 323
 324     QTAILQ_FOREACH_SAFE(bp, &cpu->breakpoints, entry, next) {
 325         if (bp->flags & mask) {
 326             cpu_breakpoint_remove_by_ref(cpu, bp);
 327         }
 328     }
 329 }
 330
 331 /* enable or disable single step mode. EXCP_DEBUG is returned by the
 332    CPU loop after each instruction */
 333 void cpu_single_step(CPUState *cpu, int enabled)
 334 {
 335     if (cpu->singlestep_enabled != enabled) {
 336         cpu->singlestep_enabled = enabled;
 337         if (kvm_enabled()) {
 338             kvm_update_guest_debug(cpu, 0);
 339         } else {
 340             /* must flush all the translated code to avoid inconsistencies */
 341             /* XXX: only flush what is necessary */
 342             tb_flush(cpu);
 343         }
 344         trace_breakpoint_singlestep(cpu->cpu_index, enabled);
 345     }
 346 }
 347
 348 void cpu_abort(CPUState *cpu, const char *fmt, ...)
 349 {
 350     va_list ap;
 351     va_list ap2;
 352
 353     va_start(ap, fmt);
 354     va_copy(ap2, ap);
 355     fprintf(stderr, "qemu: fatal: ");
 356     vfprintf(stderr, fmt, ap);
 357     fprintf(stderr, "\n");
 358     cpu_dump_state(cpu, stderr, CPU_DUMP_FPU | CPU_DUMP_CCOP);
 359     if (qemu_log_separate()) {
 360         FILE *logfile = qemu_log_lock();
 361         qemu_log("qemu: fatal: ");
 362         qemu_log_vprintf(fmt, ap2);
 363         qemu_log("\n");
 364         log_cpu_state(cpu, CPU_DUMP_FPU | CPU_DUMP_CCOP);
 365         qemu_log_flush();
 366         qemu_log_unlock(logfile);
 367         qemu_log_close();
 368     }
 369     va_end(ap2);
 370     va_end(ap);
 371     replay_finish();
 372 #if defined(CONFIG_USER_ONLY)
 373     {
 374         struct sigaction act;
 375         sigfillset(&act.sa_mask);
 376         act.sa_handler = SIG_DFL;
 377         act.sa_flags = 0;
 378         sigaction(SIGABRT, &act, NULL);
 379     }
 380 #endif
 381     abort();
 382 }
 383
 384 /* physical memory access (slow version, mainly for debug) */
 385 #if defined(CONFIG_USER_ONLY)
 386 int cpu_memory_rw_debug(CPUState *cpu, target_ulong addr,
 387                         void *ptr, target_ulong len, bool is_write)
 388 {
 389     int flags;
 390     target_ulong l, page;
 391     void * p;
 392     uint8_t *buf = ptr;
 393
 394     while (len > 0) {
 395         page = addr & TARGET_PAGE_MASK;
 396         l = (page + TARGET_PAGE_SIZE) - addr;
 397         if (l > len)
 398             l = len;
 399         flags = page_get_flags(page);
 400         if (!(flags & PAGE_VALID))
 401             return -1;
 402         if (is_write) {
 403             if (!(flags & PAGE_WRITE))
 404                 return -1;
 405             /* XXX: this code should not depend on lock_user */
 406             if (!(p = lock_user(VERIFY_WRITE, addr, l, 0)))
 407                 return -1;
 408             memcpy(p, buf, l);
 409             unlock_user(p, addr, l);
 410         } else {
 411             if (!(flags & PAGE_READ))
 412                 return -1;
 413             /* XXX: this code should not depend on lock_user */
 414             if (!(p = lock_user(VERIFY_READ, addr, l, 1)))
 415                 return -1;
 416             memcpy(buf, p, l);
 417             unlock_user(p, addr, 0);
 418         }
 419         len -= l;
 420         buf += l;
 421         addr += l;
 422     }
 423     return 0;
 424 }
 425 #endif
 426
 427 bool target_words_bigendian(void)
 428 {
 429 #if defined(TARGET_WORDS_BIGENDIAN)
 430     return true;
 431 #else
 432     return false;
 433 #endif
 434 }
 435
 436 void page_size_init(void)
 437 {
 438     /* NOTE: we can always suppose that qemu_host_page_size >=
 439        TARGET_PAGE_SIZE */
 440     if (qemu_host_page_size == 0) {
 441         qemu_host_page_size = qemu_real_host_page_size;
 442     }
 443     if (qemu_host_page_size < TARGET_PAGE_SIZE) {
 444         qemu_host_page_size = TARGET_PAGE_SIZE;
 445     }
 446     qemu_host_page_mask = -(intptr_t)qemu_host_page_size;
 447 }