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