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     CPUClass *cc = CPU_GET_CLASS(cpu);
 271     CPUBreakpoint *bp;
 272
 273     if (cc->gdb_adjust_breakpoint) {
 274         pc = cc->gdb_adjust_breakpoint(cpu, pc);
 275     }
 276
 277     bp = g_malloc(sizeof(*bp));
 278
 279     bp->pc = pc;
 280     bp->flags = flags;
 281
 282     /* keep all GDB-injected breakpoints in front */
 283     if (flags & BP_GDB) {
 284         QTAILQ_INSERT_HEAD(&cpu->breakpoints, bp, entry);
 285     } else {
 286         QTAILQ_INSERT_TAIL(&cpu->breakpoints, bp, entry);
 287     }
 288
 289     breakpoint_invalidate(cpu, pc);
 290
 291     if (breakpoint) {
 292         *breakpoint = bp;
 293     }
 294
 295     trace_breakpoint_insert(cpu->cpu_index, pc, flags);
 296     return 0;
 297 }
 298
 299 /* Remove a specific breakpoint.  */
 300 int cpu_breakpoint_remove(CPUState *cpu, vaddr pc, int flags)
 301 {
 302     CPUClass *cc = CPU_GET_CLASS(cpu);
 303     CPUBreakpoint *bp;
 304
 305     if (cc->gdb_adjust_breakpoint) {
 306         pc = cc->gdb_adjust_breakpoint(cpu, pc);
 307     }
 308
 309     QTAILQ_FOREACH(bp, &cpu->breakpoints, entry) {
 310         if (bp->pc == pc && bp->flags == flags) {
 311             cpu_breakpoint_remove_by_ref(cpu, bp);
 312             return 0;
 313         }
 314     }
 315     return -ENOENT;
 316 }
 317
 318 /* Remove a specific breakpoint by reference.  */
 319 void cpu_breakpoint_remove_by_ref(CPUState *cpu, CPUBreakpoint *bp)
 320 {
 321     QTAILQ_REMOVE(&cpu->breakpoints, bp, entry);
 322
 323     breakpoint_invalidate(cpu, bp->pc);
 324
 325     trace_breakpoint_remove(cpu->cpu_index, bp->pc, bp->flags);
 326     g_free(bp);
 327 }
 328
 329 /* Remove all matching breakpoints. */
 330 void cpu_breakpoint_remove_all(CPUState *cpu, int mask)
 331 {
 332     CPUBreakpoint *bp, *next;
 333
 334     QTAILQ_FOREACH_SAFE(bp, &cpu->breakpoints, entry, next) {
 335         if (bp->flags & mask) {
 336             cpu_breakpoint_remove_by_ref(cpu, bp);
 337         }
 338     }
 339 }
 340
 341 /* enable or disable single step mode. EXCP_DEBUG is returned by the
 342    CPU loop after each instruction */
 343 void cpu_single_step(CPUState *cpu, int enabled)
 344 {
 345     if (cpu->singlestep_enabled != enabled) {
 346         cpu->singlestep_enabled = enabled;
 347         if (kvm_enabled()) {
 348             kvm_update_guest_debug(cpu, 0);
 349         } else {
 350             /* must flush all the translated code to avoid inconsistencies */
 351             /* XXX: only flush what is necessary */
 352             tb_flush(cpu);
 353         }
 354         trace_breakpoint_singlestep(cpu->cpu_index, enabled);
 355     }
 356 }
 357
 358 void cpu_abort(CPUState *cpu, const char *fmt, ...)
 359 {
 360     va_list ap;
 361     va_list ap2;
 362
 363     va_start(ap, fmt);
 364     va_copy(ap2, ap);
 365     fprintf(stderr, "qemu: fatal: ");
 366     vfprintf(stderr, fmt, ap);
 367     fprintf(stderr, "\n");
 368     cpu_dump_state(cpu, stderr, CPU_DUMP_FPU | CPU_DUMP_CCOP);
 369     if (qemu_log_separate()) {
 370         FILE *logfile = qemu_log_lock();
 371         qemu_log("qemu: fatal: ");
 372         qemu_log_vprintf(fmt, ap2);
 373         qemu_log("\n");
 374         log_cpu_state(cpu, CPU_DUMP_FPU | CPU_DUMP_CCOP);
 375         qemu_log_flush();
 376         qemu_log_unlock(logfile);
 377         qemu_log_close();
 378     }
 379     va_end(ap2);
 380     va_end(ap);
 381     replay_finish();
 382 #if defined(CONFIG_USER_ONLY)
 383     {
 384         struct sigaction act;
 385         sigfillset(&act.sa_mask);
 386         act.sa_handler = SIG_DFL;
 387         act.sa_flags = 0;
 388         sigaction(SIGABRT, &act, NULL);
 389     }
 390 #endif
 391     abort();
 392 }
 393
 394 /* physical memory access (slow version, mainly for debug) */
 395 #if defined(CONFIG_USER_ONLY)
 396 int cpu_memory_rw_debug(CPUState *cpu, target_ulong addr,
 397                         void *ptr, target_ulong len, bool is_write)
 398 {
 399     int flags;
 400     target_ulong l, page;
 401     void * p;
 402     uint8_t *buf = ptr;
 403
 404     while (len > 0) {
 405         page = addr & TARGET_PAGE_MASK;
 406         l = (page + TARGET_PAGE_SIZE) - addr;
 407         if (l > len)
 408             l = len;
 409         flags = page_get_flags(page);
 410         if (!(flags & PAGE_VALID))
 411             return -1;
 412         if (is_write) {
 413             if (!(flags & PAGE_WRITE))
 414                 return -1;
 415             /* XXX: this code should not depend on lock_user */
 416             if (!(p = lock_user(VERIFY_WRITE, addr, l, 0)))
 417                 return -1;
 418             memcpy(p, buf, l);
 419             unlock_user(p, addr, l);
 420         } else {
 421             if (!(flags & PAGE_READ))
 422                 return -1;
 423             /* XXX: this code should not depend on lock_user */
 424             if (!(p = lock_user(VERIFY_READ, addr, l, 1)))
 425                 return -1;
 426             memcpy(buf, p, l);
 427             unlock_user(p, addr, 0);
 428         }
 429         len -= l;
 430         buf += l;
 431         addr += l;
 432     }
 433     return 0;
 434 }
 435 #endif
 436
 437 bool target_words_bigendian(void)
 438 {
 439 #if defined(TARGET_WORDS_BIGENDIAN)
 440     return true;
 441 #else
 442     return false;
 443 #endif
 444 }
 445
 446 void page_size_init(void)
 447 {
 448     /* NOTE: we can always suppose that qemu_host_page_size >=
 449        TARGET_PAGE_SIZE */
 450     if (qemu_host_page_size == 0) {
 451         qemu_host_page_size = qemu_real_host_page_size;
 452     }
 453     if (qemu_host_page_size < TARGET_PAGE_SIZE) {
 454         qemu_host_page_size = TARGET_PAGE_SIZE;
 455     }
 456     qemu_host_page_mask = -(intptr_t)qemu_host_page_size;
 457 }