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     if (!accel_cpu_realizefn(cpu, errp)) {
 134         return;
 135     }
 136 #ifdef CONFIG_TCG
 137     /* NB: errp parameter is unused currently */
 138     if (tcg_enabled()) {
 139         tcg_exec_realizefn(cpu, errp);
 140     }
 141 #endif /* CONFIG_TCG */
 142
 143 #ifdef CONFIG_USER_ONLY
 144     assert(cc->vmsd == NULL);
 145 #else
 146     if (qdev_get_vmsd(DEVICE(cpu)) == NULL) {
 147         vmstate_register(NULL, cpu->cpu_index, &vmstate_cpu_common, cpu);
 148     }
 149     if (cc->vmsd != NULL) {
 150         vmstate_register(NULL, cpu->cpu_index, cc->vmsd, cpu);
 151     }
 152 #endif /* CONFIG_USER_ONLY */
 153 }
 154
 155 void cpu_exec_unrealizefn(CPUState *cpu)
 156 {
 157     CPUClass *cc = CPU_GET_CLASS(cpu);
 158
 159 #ifdef CONFIG_USER_ONLY
 160     assert(cc->vmsd == NULL);
 161 #else
 162     if (cc->vmsd != NULL) {
 163         vmstate_unregister(NULL, cc->vmsd, cpu);
 164     }
 165     if (qdev_get_vmsd(DEVICE(cpu)) == NULL) {
 166         vmstate_unregister(NULL, &vmstate_cpu_common, cpu);
 167     }
 168 #endif
 169 #ifdef CONFIG_TCG
 170     /* NB: errp parameter is unused currently */
 171     if (tcg_enabled()) {
 172         tcg_exec_unrealizefn(cpu);
 173     }
 174 #endif /* CONFIG_TCG */
 175
 176     cpu_list_remove(cpu);
 177 }
 178
 179 void cpu_exec_initfn(CPUState *cpu)
 180 {
 181     cpu->as = NULL;
 182     cpu->num_ases = 0;
 183
 184 #ifndef CONFIG_USER_ONLY
 185     cpu->thread_id = qemu_get_thread_id();
 186     cpu->memory = get_system_memory();
 187     object_ref(OBJECT(cpu->memory));
 188 #endif
 189 }
 190
 191 const char *parse_cpu_option(const char *cpu_option)
 192 {
 193     ObjectClass *oc;
 194     CPUClass *cc;
 195     gchar **model_pieces;
 196     const char *cpu_type;
 197
 198     model_pieces = g_strsplit(cpu_option, ",", 2);
 199     if (!model_pieces[0]) {
 200         error_report("-cpu option cannot be empty");
 201         exit(1);
 202     }
 203
 204     oc = cpu_class_by_name(CPU_RESOLVING_TYPE, model_pieces[0]);
 205     if (oc == NULL) {
 206         error_report("unable to find CPU model '%s'", model_pieces[0]);
 207         g_strfreev(model_pieces);
 208         exit(EXIT_FAILURE);
 209     }
 210
 211     cpu_type = object_class_get_name(oc);
 212     cc = CPU_CLASS(oc);
 213     cc->parse_features(cpu_type, model_pieces[1], &error_fatal);
 214     g_strfreev(model_pieces);
 215     return cpu_type;
 216 }
 217
 218 #if defined(CONFIG_USER_ONLY)
 219 void tb_invalidate_phys_addr(target_ulong addr)
 220 {
 221     mmap_lock();
 222     tb_invalidate_phys_page_range(addr, addr + 1);
 223     mmap_unlock();
 224 }
 225
 226 static void breakpoint_invalidate(CPUState *cpu, target_ulong pc)
 227 {
 228     tb_invalidate_phys_addr(pc);
 229 }
 230 #else
 231 void tb_invalidate_phys_addr(AddressSpace *as, hwaddr addr, MemTxAttrs attrs)
 232 {
 233     ram_addr_t ram_addr;
 234     MemoryRegion *mr;
 235     hwaddr l = 1;
 236
 237     if (!tcg_enabled()) {
 238         return;
 239     }
 240
 241     RCU_READ_LOCK_GUARD();
 242     mr = address_space_translate(as, addr, &addr, &l, false, attrs);
 243     if (!(memory_region_is_ram(mr)
 244           || memory_region_is_romd(mr))) {
 245         return;
 246     }
 247     ram_addr = memory_region_get_ram_addr(mr) + addr;
 248     tb_invalidate_phys_page_range(ram_addr, ram_addr + 1);
 249 }
 250
 251 static void breakpoint_invalidate(CPUState *cpu, target_ulong pc)
 252 {
 253     /*
 254      * There may not be a virtual to physical translation for the pc
 255      * right now, but there may exist cached TB for this pc.
 256      * Flush the whole TB cache to force re-translation of such TBs.
 257      * This is heavyweight, but we're debugging anyway.
 258      */
 259     tb_flush(cpu);
 260 }
 261 #endif
 262
 263 /* Add a breakpoint.  */
 264 int cpu_breakpoint_insert(CPUState *cpu, vaddr pc, int flags,
 265                           CPUBreakpoint **breakpoint)
 266 {
 267     CPUBreakpoint *bp;
 268
 269     bp = g_malloc(sizeof(*bp));
 270
 271     bp->pc = pc;
 272     bp->flags = flags;
 273
 274     /* keep all GDB-injected breakpoints in front */
 275     if (flags & BP_GDB) {
 276         QTAILQ_INSERT_HEAD(&cpu->breakpoints, bp, entry);
 277     } else {
 278         QTAILQ_INSERT_TAIL(&cpu->breakpoints, bp, entry);
 279     }
 280
 281     breakpoint_invalidate(cpu, pc);
 282
 283     if (breakpoint) {
 284         *breakpoint = bp;
 285     }
 286     return 0;
 287 }
 288
 289 /* Remove a specific breakpoint.  */
 290 int cpu_breakpoint_remove(CPUState *cpu, vaddr pc, int flags)
 291 {
 292     CPUBreakpoint *bp;
 293
 294     QTAILQ_FOREACH(bp, &cpu->breakpoints, entry) {
 295         if (bp->pc == pc && bp->flags == flags) {
 296             cpu_breakpoint_remove_by_ref(cpu, bp);
 297             return 0;
 298         }
 299     }
 300     return -ENOENT;
 301 }
 302
 303 /* Remove a specific breakpoint by reference.  */
 304 void cpu_breakpoint_remove_by_ref(CPUState *cpu, CPUBreakpoint *breakpoint)
 305 {
 306     QTAILQ_REMOVE(&cpu->breakpoints, breakpoint, entry);
 307
 308     breakpoint_invalidate(cpu, breakpoint->pc);
 309
 310     g_free(breakpoint);
 311 }
 312
 313 /* Remove all matching breakpoints. */
 314 void cpu_breakpoint_remove_all(CPUState *cpu, int mask)
 315 {
 316     CPUBreakpoint *bp, *next;
 317
 318     QTAILQ_FOREACH_SAFE(bp, &cpu->breakpoints, entry, next) {
 319         if (bp->flags & mask) {
 320             cpu_breakpoint_remove_by_ref(cpu, bp);
 321         }
 322     }
 323 }
 324
 325 /* enable or disable single step mode. EXCP_DEBUG is returned by the
 326    CPU loop after each instruction */
 327 void cpu_single_step(CPUState *cpu, int enabled)
 328 {
 329     if (cpu->singlestep_enabled != enabled) {
 330         cpu->singlestep_enabled = enabled;
 331         if (kvm_enabled()) {
 332             kvm_update_guest_debug(cpu, 0);
 333         } else {
 334             /* must flush all the translated code to avoid inconsistencies */
 335             /* XXX: only flush what is necessary */
 336             tb_flush(cpu);
 337         }
 338     }
 339 }
 340
 341 void cpu_abort(CPUState *cpu, const char *fmt, ...)
 342 {
 343     va_list ap;
 344     va_list ap2;
 345
 346     va_start(ap, fmt);
 347     va_copy(ap2, ap);
 348     fprintf(stderr, "qemu: fatal: ");
 349     vfprintf(stderr, fmt, ap);
 350     fprintf(stderr, "\n");
 351     cpu_dump_state(cpu, stderr, CPU_DUMP_FPU | CPU_DUMP_CCOP);
 352     if (qemu_log_separate()) {
 353         FILE *logfile = qemu_log_lock();
 354         qemu_log("qemu: fatal: ");
 355         qemu_log_vprintf(fmt, ap2);
 356         qemu_log("\n");
 357         log_cpu_state(cpu, CPU_DUMP_FPU | CPU_DUMP_CCOP);
 358         qemu_log_flush();
 359         qemu_log_unlock(logfile);
 360         qemu_log_close();
 361     }
 362     va_end(ap2);
 363     va_end(ap);
 364     replay_finish();
 365 #if defined(CONFIG_USER_ONLY)
 366     {
 367         struct sigaction act;
 368         sigfillset(&act.sa_mask);
 369         act.sa_handler = SIG_DFL;
 370         act.sa_flags = 0;
 371         sigaction(SIGABRT, &act, NULL);
 372     }
 373 #endif
 374     abort();
 375 }
 376
 377 /* physical memory access (slow version, mainly for debug) */
 378 #if defined(CONFIG_USER_ONLY)
 379 int cpu_memory_rw_debug(CPUState *cpu, target_ulong addr,
 380                         void *ptr, target_ulong len, bool is_write)
 381 {
 382     int flags;
 383     target_ulong l, page;
 384     void * p;
 385     uint8_t *buf = ptr;
 386
 387     while (len > 0) {
 388         page = addr & TARGET_PAGE_MASK;
 389         l = (page + TARGET_PAGE_SIZE) - addr;
 390         if (l > len)
 391             l = len;
 392         flags = page_get_flags(page);
 393         if (!(flags & PAGE_VALID))
 394             return -1;
 395         if (is_write) {
 396             if (!(flags & PAGE_WRITE))
 397                 return -1;
 398             /* XXX: this code should not depend on lock_user */
 399             if (!(p = lock_user(VERIFY_WRITE, addr, l, 0)))
 400                 return -1;
 401             memcpy(p, buf, l);
 402             unlock_user(p, addr, l);
 403         } else {
 404             if (!(flags & PAGE_READ))
 405                 return -1;
 406             /* XXX: this code should not depend on lock_user */
 407             if (!(p = lock_user(VERIFY_READ, addr, l, 1)))
 408                 return -1;
 409             memcpy(buf, p, l);
 410             unlock_user(p, addr, 0);
 411         }
 412         len -= l;
 413         buf += l;
 414         addr += l;
 415     }
 416     return 0;
 417 }
 418 #endif
 419
 420 bool target_words_bigendian(void)
 421 {
 422 #if defined(TARGET_WORDS_BIGENDIAN)
 423     return true;
 424 #else
 425     return false;
 426 #endif
 427 }
 428
 429 void page_size_init(void)
 430 {
 431     /* NOTE: we can always suppose that qemu_host_page_size >=
 432        TARGET_PAGE_SIZE */
 433     if (qemu_host_page_size == 0) {
 434         qemu_host_page_size = qemu_real_host_page_size;
 435     }
 436     if (qemu_host_page_size < TARGET_PAGE_SIZE) {
 437         qemu_host_page_size = TARGET_PAGE_SIZE;
 438     }
 439     qemu_host_page_mask = -(intptr_t)qemu_host_page_size;
 440 }