qemu

cpu.c (13140B)

---

 /*
  * Target-specific parts of the CPU object
  *
  *  Copyright (c) 2003 Fabrice Bellard
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Lesser General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  *
  * This library is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  * Lesser General Public License for more details.
  *
  * You should have received a copy of the GNU Lesser General Public
  * License along with this library; if not, see <http://www.gnu.org/licenses/>.
  */
 
 #include "qemu/osdep.h"
 #include "qapi/error.h"
 
 #include "exec/target_page.h"
 #include "hw/qdev-core.h"
 #include "hw/qdev-properties.h"
 #include "qemu/error-report.h"
 #include "migration/vmstate.h"
 #ifdef CONFIG_USER_ONLY
 #include "qemu.h"
 #else
 #include "hw/core/sysemu-cpu-ops.h"
 #include "exec/address-spaces.h"
 #endif
 #include "sysemu/tcg.h"
 #include "sysemu/kvm.h"
 #include "sysemu/replay.h"
 #include "exec/cpu-common.h"
 #include "exec/exec-all.h"
 #include "exec/translate-all.h"
 #include "exec/log.h"
 #include "hw/core/accel-cpu.h"
 #include "trace/trace-root.h"
 #include "qemu/accel.h"
 
 uintptr_t qemu_host_page_size;
 intptr_t qemu_host_page_mask;
 
 #ifndef CONFIG_USER_ONLY
 static int cpu_common_post_load(void *opaque, int version_id)
 {
     CPUState *cpu = opaque;
 
     /* 0x01 was CPU_INTERRUPT_EXIT. This line can be removed when the
        version_id is increased. */
     cpu->interrupt_request &= ~0x01;
     tlb_flush(cpu);
 
     /* loadvm has just updated the content of RAM, bypassing the
      * usual mechanisms that ensure we flush TBs for writes to
      * memory we've translated code from. So we must flush all TBs,
      * which will now be stale.
      */
     tb_flush(cpu);
 
     return 0;
 }
 
 static int cpu_common_pre_load(void *opaque)
 {
     CPUState *cpu = opaque;
 
     cpu->exception_index = -1;
 
     return 0;
 }
 
 static bool cpu_common_exception_index_needed(void *opaque)
 {
     CPUState *cpu = opaque;
 
     return tcg_enabled() && cpu->exception_index != -1;
 }
 
 static const VMStateDescription vmstate_cpu_common_exception_index = {
     .name = "cpu_common/exception_index",
     .version_id = 1,
     .minimum_version_id = 1,
     .needed = cpu_common_exception_index_needed,
     .fields = (VMStateField[]) {
         VMSTATE_INT32(exception_index, CPUState),
         VMSTATE_END_OF_LIST()
     }
 };
 
 static bool cpu_common_crash_occurred_needed(void *opaque)
 {
     CPUState *cpu = opaque;
 
     return cpu->crash_occurred;
 }
 
 static const VMStateDescription vmstate_cpu_common_crash_occurred = {
     .name = "cpu_common/crash_occurred",
     .version_id = 1,
     .minimum_version_id = 1,
     .needed = cpu_common_crash_occurred_needed,
     .fields = (VMStateField[]) {
         VMSTATE_BOOL(crash_occurred, CPUState),
         VMSTATE_END_OF_LIST()
     }
 };
 
 const VMStateDescription vmstate_cpu_common = {
     .name = "cpu_common",
     .version_id = 1,
     .minimum_version_id = 1,
     .pre_load = cpu_common_pre_load,
     .post_load = cpu_common_post_load,
     .fields = (VMStateField[]) {
         VMSTATE_UINT32(halted, CPUState),
         VMSTATE_UINT32(interrupt_request, CPUState),
         VMSTATE_END_OF_LIST()
     },
     .subsections = (const VMStateDescription*[]) {
         &vmstate_cpu_common_exception_index,
         &vmstate_cpu_common_crash_occurred,
         NULL
     }
 };
 #endif
 
 void cpu_exec_realizefn(CPUState *cpu, Error **errp)
 {
     /* cache the cpu class for the hotpath */
     cpu->cc = CPU_GET_CLASS(cpu);
 
     if (!accel_cpu_realizefn(cpu, errp)) {
         return;
     }
 
     /* NB: errp parameter is unused currently */
     if (tcg_enabled()) {
         tcg_exec_realizefn(cpu, errp);
     }
 
     /* Wait until cpu initialization complete before exposing cpu. */
     cpu_list_add(cpu);
 
     /* Plugin initialization must wait until cpu_index assigned. */
     if (tcg_enabled()) {
         qemu_plugin_vcpu_init_hook(cpu);
     }
 
 #ifdef CONFIG_USER_ONLY
     assert(qdev_get_vmsd(DEVICE(cpu)) == NULL ||
            qdev_get_vmsd(DEVICE(cpu))->unmigratable);
 #else
     if (qdev_get_vmsd(DEVICE(cpu)) == NULL) {
         vmstate_register(NULL, cpu->cpu_index, &vmstate_cpu_common, cpu);
     }
     if (cpu->cc->sysemu_ops->legacy_vmsd != NULL) {
         vmstate_register(NULL, cpu->cpu_index, cpu->cc->sysemu_ops->legacy_vmsd, cpu);
     }
 #endif /* CONFIG_USER_ONLY */
 }
 
 void cpu_exec_unrealizefn(CPUState *cpu)
 {
 #ifndef CONFIG_USER_ONLY
     CPUClass *cc = CPU_GET_CLASS(cpu);
 
     if (cc->sysemu_ops->legacy_vmsd != NULL) {
         vmstate_unregister(NULL, cc->sysemu_ops->legacy_vmsd, cpu);
     }
     if (qdev_get_vmsd(DEVICE(cpu)) == NULL) {
         vmstate_unregister(NULL, &vmstate_cpu_common, cpu);
     }
 #endif
     if (tcg_enabled()) {
         tcg_exec_unrealizefn(cpu);
     }
 
     cpu_list_remove(cpu);
 }
 
 /*
  * This can't go in hw/core/cpu.c because that file is compiled only
  * once for both user-mode and system builds.
  */
 static Property cpu_common_props[] = {
 #ifdef CONFIG_USER_ONLY
     /*
      * Create a property for the user-only object, so users can
      * adjust prctl(PR_SET_UNALIGN) from the command-line.
      * Has no effect if the target does not support the feature.
      */
     DEFINE_PROP_BOOL("prctl-unalign-sigbus", CPUState,
                      prctl_unalign_sigbus, false),
 #else
     /*
      * Create a memory property for softmmu CPU object, so users can
      * wire up its memory.  The default if no link is set up is to use
      * the system address space.
      */
     DEFINE_PROP_LINK("memory", CPUState, memory, TYPE_MEMORY_REGION,
                      MemoryRegion *),
 #endif
     DEFINE_PROP_END_OF_LIST(),
 };
 
 static bool cpu_get_start_powered_off(Object *obj, Error **errp)
 {
     CPUState *cpu = CPU(obj);
     return cpu->start_powered_off;
 }
 
 static void cpu_set_start_powered_off(Object *obj, bool value, Error **errp)
 {
     CPUState *cpu = CPU(obj);
     cpu->start_powered_off = value;
 }
 
 void cpu_class_init_props(DeviceClass *dc)
 {
     ObjectClass *oc = OBJECT_CLASS(dc);
 
     device_class_set_props(dc, cpu_common_props);
     /*
      * We can't use DEFINE_PROP_BOOL in the Property array for this
      * property, because we want this to be settable after realize.
      */
     object_class_property_add_bool(oc, "start-powered-off",
                                    cpu_get_start_powered_off,
                                    cpu_set_start_powered_off);
 }
 
 void cpu_exec_initfn(CPUState *cpu)
 {
     cpu->as = NULL;
     cpu->num_ases = 0;
 
 #ifndef CONFIG_USER_ONLY
     cpu->thread_id = qemu_get_thread_id();
     cpu->memory = get_system_memory();
     object_ref(OBJECT(cpu->memory));
 #endif
 }
 
 const char *parse_cpu_option(const char *cpu_option)
 {
     ObjectClass *oc;
     CPUClass *cc;
     gchar **model_pieces;
     const char *cpu_type;
 
     model_pieces = g_strsplit(cpu_option, ",", 2);
     if (!model_pieces[0]) {
         error_report("-cpu option cannot be empty");
         exit(1);
     }
 
     oc = cpu_class_by_name(CPU_RESOLVING_TYPE, model_pieces[0]);
     if (oc == NULL) {
         error_report("unable to find CPU model '%s'", model_pieces[0]);
         g_strfreev(model_pieces);
         exit(EXIT_FAILURE);
     }
 
     cpu_type = object_class_get_name(oc);
     cc = CPU_CLASS(oc);
     cc->parse_features(cpu_type, model_pieces[1], &error_fatal);
     g_strfreev(model_pieces);
     return cpu_type;
 }
 
 void list_cpus(const char *optarg)
 {
     /* XXX: implement xxx_cpu_list for targets that still miss it */
 #if defined(cpu_list)
     cpu_list();
 #endif
 }
 
 #if defined(CONFIG_USER_ONLY)
 void tb_invalidate_phys_addr(target_ulong addr)
 {
     mmap_lock();
     tb_invalidate_phys_page(addr);
     mmap_unlock();
 }
 #else
 void tb_invalidate_phys_addr(AddressSpace *as, hwaddr addr, MemTxAttrs attrs)
 {
     ram_addr_t ram_addr;
     MemoryRegion *mr;
     hwaddr l = 1;
 
     if (!tcg_enabled()) {
         return;
     }
 
     RCU_READ_LOCK_GUARD();
     mr = address_space_translate(as, addr, &addr, &l, false, attrs);
     if (!(memory_region_is_ram(mr)
           || memory_region_is_romd(mr))) {
         return;
     }
     ram_addr = memory_region_get_ram_addr(mr) + addr;
     tb_invalidate_phys_page(ram_addr);
 }
 #endif
 
 /* Add a breakpoint.  */
 int cpu_breakpoint_insert(CPUState *cpu, vaddr pc, int flags,
                           CPUBreakpoint **breakpoint)
 {
     CPUClass *cc = CPU_GET_CLASS(cpu);
     CPUBreakpoint *bp;
 
     if (cc->gdb_adjust_breakpoint) {
         pc = cc->gdb_adjust_breakpoint(cpu, pc);
     }
 
     bp = g_malloc(sizeof(*bp));
 
     bp->pc = pc;
     bp->flags = flags;
 
     /* keep all GDB-injected breakpoints in front */
     if (flags & BP_GDB) {
         QTAILQ_INSERT_HEAD(&cpu->breakpoints, bp, entry);
     } else {
         QTAILQ_INSERT_TAIL(&cpu->breakpoints, bp, entry);
     }
 
     if (breakpoint) {
         *breakpoint = bp;
     }
 
     trace_breakpoint_insert(cpu->cpu_index, pc, flags);
     return 0;
 }
 
 /* Remove a specific breakpoint.  */
 int cpu_breakpoint_remove(CPUState *cpu, vaddr pc, int flags)
 {
     CPUClass *cc = CPU_GET_CLASS(cpu);
     CPUBreakpoint *bp;
 
     if (cc->gdb_adjust_breakpoint) {
         pc = cc->gdb_adjust_breakpoint(cpu, pc);
     }
 
     QTAILQ_FOREACH(bp, &cpu->breakpoints, entry) {
         if (bp->pc == pc && bp->flags == flags) {
             cpu_breakpoint_remove_by_ref(cpu, bp);
             return 0;
         }
     }
     return -ENOENT;
 }
 
 /* Remove a specific breakpoint by reference.  */
 void cpu_breakpoint_remove_by_ref(CPUState *cpu, CPUBreakpoint *bp)
 {
     QTAILQ_REMOVE(&cpu->breakpoints, bp, entry);
 
     trace_breakpoint_remove(cpu->cpu_index, bp->pc, bp->flags);
     g_free(bp);
 }
 
 /* Remove all matching breakpoints. */
 void cpu_breakpoint_remove_all(CPUState *cpu, int mask)
 {
     CPUBreakpoint *bp, *next;
 
     QTAILQ_FOREACH_SAFE(bp, &cpu->breakpoints, entry, next) {
         if (bp->flags & mask) {
             cpu_breakpoint_remove_by_ref(cpu, bp);
         }
     }
 }
 
 /* enable or disable single step mode. EXCP_DEBUG is returned by the
    CPU loop after each instruction */
 void cpu_single_step(CPUState *cpu, int enabled)
 {
     if (cpu->singlestep_enabled != enabled) {
         cpu->singlestep_enabled = enabled;
         if (kvm_enabled()) {
             kvm_update_guest_debug(cpu, 0);
         }
         trace_breakpoint_singlestep(cpu->cpu_index, enabled);
     }
 }
 
 void cpu_abort(CPUState *cpu, const char *fmt, ...)
 {
     va_list ap;
     va_list ap2;
 
     va_start(ap, fmt);
     va_copy(ap2, ap);
     fprintf(stderr, "qemu: fatal: ");
     vfprintf(stderr, fmt, ap);
     fprintf(stderr, "\n");
     cpu_dump_state(cpu, stderr, CPU_DUMP_FPU | CPU_DUMP_CCOP);
     if (qemu_log_separate()) {
         FILE *logfile = qemu_log_trylock();
         if (logfile) {
             fprintf(logfile, "qemu: fatal: ");
             vfprintf(logfile, fmt, ap2);
             fprintf(logfile, "\n");
             cpu_dump_state(cpu, logfile, CPU_DUMP_FPU | CPU_DUMP_CCOP);
             qemu_log_unlock(logfile);
         }
     }
     va_end(ap2);
     va_end(ap);
     replay_finish();
 #if defined(CONFIG_USER_ONLY)
     {
         struct sigaction act;
         sigfillset(&act.sa_mask);
         act.sa_handler = SIG_DFL;
         act.sa_flags = 0;
         sigaction(SIGABRT, &act, NULL);
     }
 #endif
     abort();
 }
 
 /* physical memory access (slow version, mainly for debug) */
 #if defined(CONFIG_USER_ONLY)
 int cpu_memory_rw_debug(CPUState *cpu, vaddr addr,
                         void *ptr, size_t len, bool is_write)
 {
     int flags;
     vaddr l, page;
     void * p;
     uint8_t *buf = ptr;
 
     while (len > 0) {
         page = addr & TARGET_PAGE_MASK;
         l = (page + TARGET_PAGE_SIZE) - addr;
         if (l > len)
             l = len;
         flags = page_get_flags(page);
         if (!(flags & PAGE_VALID))
             return -1;
         if (is_write) {
             if (!(flags & PAGE_WRITE))
                 return -1;
             /* XXX: this code should not depend on lock_user */
             if (!(p = lock_user(VERIFY_WRITE, addr, l, 0)))
                 return -1;
             memcpy(p, buf, l);
             unlock_user(p, addr, l);
         } else {
             if (!(flags & PAGE_READ))
                 return -1;
             /* XXX: this code should not depend on lock_user */
             if (!(p = lock_user(VERIFY_READ, addr, l, 1)))
                 return -1;
             memcpy(buf, p, l);
             unlock_user(p, addr, 0);
         }
         len -= l;
         buf += l;
         addr += l;
     }
     return 0;
 }
 #endif
 
 bool target_words_bigendian(void)
 {
 #if TARGET_BIG_ENDIAN
     return true;
 #else
     return false;
 #endif
 }
 
 void page_size_init(void)
 {
     /* NOTE: we can always suppose that qemu_host_page_size >=
        TARGET_PAGE_SIZE */
     if (qemu_host_page_size == 0) {
         qemu_host_page_size = qemu_real_host_page_size();
     }
     if (qemu_host_page_size < TARGET_PAGE_SIZE) {
         qemu_host_page_size = TARGET_PAGE_SIZE;
     }
     qemu_host_page_mask = -(intptr_t)qemu_host_page_size;
 }