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