xref: /openbmc/qemu/cpu-target.c (revision c0d691ab844db8cdf2be8f6cf43887cfff56e386)
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 "qapi/error.h"
22  
23  #include "exec/target_page.h"
24  #include "exec/page-protection.h"
25  #include "hw/qdev-core.h"
26  #include "hw/qdev-properties.h"
27  #include "qemu/error-report.h"
28  #include "qemu/qemu-print.h"
29  #include "migration/vmstate.h"
30  #ifdef CONFIG_USER_ONLY
31  #include "qemu.h"
32  #else
33  #include "hw/core/sysemu-cpu-ops.h"
34  #include "exec/address-spaces.h"
35  #include "exec/memory.h"
36  #endif
37  #include "sysemu/cpus.h"
38  #include "sysemu/tcg.h"
39  #include "exec/tswap.h"
40  #include "exec/replay-core.h"
41  #include "exec/cpu-common.h"
42  #include "exec/exec-all.h"
43  #include "exec/tb-flush.h"
44  #include "exec/translate-all.h"
45  #include "exec/log.h"
46  #include "hw/core/accel-cpu.h"
47  #include "trace/trace-root.h"
48  #include "qemu/accel.h"
49  
50  #ifndef CONFIG_USER_ONLY
51  static int cpu_common_post_load(void *opaque, int version_id)
52  {
53      CPUState *cpu = opaque;
54  
55      /* 0x01 was CPU_INTERRUPT_EXIT. This line can be removed when the
56         version_id is increased. */
57      cpu->interrupt_request &= ~0x01;
58      tlb_flush(cpu);
59  
60      /* loadvm has just updated the content of RAM, bypassing the
61       * usual mechanisms that ensure we flush TBs for writes to
62       * memory we've translated code from. So we must flush all TBs,
63       * which will now be stale.
64       */
65      tb_flush(cpu);
66  
67      return 0;
68  }
69  
70  static int cpu_common_pre_load(void *opaque)
71  {
72      CPUState *cpu = opaque;
73  
74      cpu->exception_index = -1;
75  
76      return 0;
77  }
78  
79  static bool cpu_common_exception_index_needed(void *opaque)
80  {
81      CPUState *cpu = opaque;
82  
83      return tcg_enabled() && cpu->exception_index != -1;
84  }
85  
86  static const VMStateDescription vmstate_cpu_common_exception_index = {
87      .name = "cpu_common/exception_index",
88      .version_id = 1,
89      .minimum_version_id = 1,
90      .needed = cpu_common_exception_index_needed,
91      .fields = (const VMStateField[]) {
92          VMSTATE_INT32(exception_index, CPUState),
93          VMSTATE_END_OF_LIST()
94      }
95  };
96  
97  static bool cpu_common_crash_occurred_needed(void *opaque)
98  {
99      CPUState *cpu = opaque;
100  
101      return cpu->crash_occurred;
102  }
103  
104  static const VMStateDescription vmstate_cpu_common_crash_occurred = {
105      .name = "cpu_common/crash_occurred",
106      .version_id = 1,
107      .minimum_version_id = 1,
108      .needed = cpu_common_crash_occurred_needed,
109      .fields = (const VMStateField[]) {
110          VMSTATE_BOOL(crash_occurred, CPUState),
111          VMSTATE_END_OF_LIST()
112      }
113  };
114  
115  const VMStateDescription vmstate_cpu_common = {
116      .name = "cpu_common",
117      .version_id = 1,
118      .minimum_version_id = 1,
119      .pre_load = cpu_common_pre_load,
120      .post_load = cpu_common_post_load,
121      .fields = (const VMStateField[]) {
122          VMSTATE_UINT32(halted, CPUState),
123          VMSTATE_UINT32(interrupt_request, CPUState),
124          VMSTATE_END_OF_LIST()
125      },
126      .subsections = (const VMStateDescription * const []) {
127          &vmstate_cpu_common_exception_index,
128          &vmstate_cpu_common_crash_occurred,
129          NULL
130      }
131  };
132  #endif
133  
134  bool cpu_exec_realizefn(CPUState *cpu, Error **errp)
135  {
136      /* cache the cpu class for the hotpath */
137      cpu->cc = CPU_GET_CLASS(cpu);
138  
139      if (!accel_cpu_common_realize(cpu, errp)) {
140          return false;
141      }
142  
143      /* Wait until cpu initialization complete before exposing cpu. */
144      cpu_list_add(cpu);
145  
146  #ifdef CONFIG_USER_ONLY
147      assert(qdev_get_vmsd(DEVICE(cpu)) == NULL ||
148             qdev_get_vmsd(DEVICE(cpu))->unmigratable);
149  #else
150      if (qdev_get_vmsd(DEVICE(cpu)) == NULL) {
151          vmstate_register(NULL, cpu->cpu_index, &vmstate_cpu_common, cpu);
152      }
153      if (cpu->cc->sysemu_ops->legacy_vmsd != NULL) {
154          vmstate_register(NULL, cpu->cpu_index, cpu->cc->sysemu_ops->legacy_vmsd, cpu);
155      }
156  #endif /* CONFIG_USER_ONLY */
157  
158      return true;
159  }
160  
161  void cpu_exec_unrealizefn(CPUState *cpu)
162  {
163  #ifndef CONFIG_USER_ONLY
164      CPUClass *cc = CPU_GET_CLASS(cpu);
165  
166      if (cc->sysemu_ops->legacy_vmsd != NULL) {
167          vmstate_unregister(NULL, cc->sysemu_ops->legacy_vmsd, cpu);
168      }
169      if (qdev_get_vmsd(DEVICE(cpu)) == NULL) {
170          vmstate_unregister(NULL, &vmstate_cpu_common, cpu);
171      }
172  #endif
173  
174      cpu_list_remove(cpu);
175      /*
176       * Now that the vCPU has been removed from the RCU list, we can call
177       * accel_cpu_common_unrealize, which may free fields using call_rcu.
178       */
179      accel_cpu_common_unrealize(cpu);
180  }
181  
182  /*
183   * This can't go in hw/core/cpu.c because that file is compiled only
184   * once for both user-mode and system builds.
185   */
186  static Property cpu_common_props[] = {
187  #ifdef CONFIG_USER_ONLY
188      /*
189       * Create a property for the user-only object, so users can
190       * adjust prctl(PR_SET_UNALIGN) from the command-line.
191       * Has no effect if the target does not support the feature.
192       */
193      DEFINE_PROP_BOOL("prctl-unalign-sigbus", CPUState,
194                       prctl_unalign_sigbus, false),
195  #else
196      /*
197       * Create a memory property for system CPU object, so users can
198       * wire up its memory.  The default if no link is set up is to use
199       * the system address space.
200       */
201      DEFINE_PROP_LINK("memory", CPUState, memory, TYPE_MEMORY_REGION,
202                       MemoryRegion *),
203  #endif
204      DEFINE_PROP_END_OF_LIST(),
205  };
206  
207  #ifndef CONFIG_USER_ONLY
208  static bool cpu_get_start_powered_off(Object *obj, Error **errp)
209  {
210      CPUState *cpu = CPU(obj);
211      return cpu->start_powered_off;
212  }
213  
214  static void cpu_set_start_powered_off(Object *obj, bool value, Error **errp)
215  {
216      CPUState *cpu = CPU(obj);
217      cpu->start_powered_off = value;
218  }
219  #endif
220  
221  void cpu_class_init_props(DeviceClass *dc)
222  {
223  #ifndef CONFIG_USER_ONLY
224      ObjectClass *oc = OBJECT_CLASS(dc);
225  
226      /*
227       * We can't use DEFINE_PROP_BOOL in the Property array for this
228       * property, because we want this to be settable after realize.
229       */
230      object_class_property_add_bool(oc, "start-powered-off",
231                                     cpu_get_start_powered_off,
232                                     cpu_set_start_powered_off);
233  #endif
234  
235      device_class_set_props(dc, cpu_common_props);
236  }
237  
238  void cpu_exec_initfn(CPUState *cpu)
239  {
240      cpu->as = NULL;
241      cpu->num_ases = 0;
242  
243  #ifndef CONFIG_USER_ONLY
244      cpu->thread_id = qemu_get_thread_id();
245      cpu->memory = get_system_memory();
246      object_ref(OBJECT(cpu->memory));
247  #endif
248  }
249  
250  char *cpu_model_from_type(const char *typename)
251  {
252      const char *suffix = "-" CPU_RESOLVING_TYPE;
253  
254      if (!object_class_by_name(typename)) {
255          return NULL;
256      }
257  
258      if (g_str_has_suffix(typename, suffix)) {
259          return g_strndup(typename, strlen(typename) - strlen(suffix));
260      }
261  
262      return g_strdup(typename);
263  }
264  
265  const char *parse_cpu_option(const char *cpu_option)
266  {
267      ObjectClass *oc;
268      CPUClass *cc;
269      gchar **model_pieces;
270      const char *cpu_type;
271  
272      model_pieces = g_strsplit(cpu_option, ",", 2);
273      if (!model_pieces[0]) {
274          error_report("-cpu option cannot be empty");
275          exit(1);
276      }
277  
278      oc = cpu_class_by_name(CPU_RESOLVING_TYPE, model_pieces[0]);
279      if (oc == NULL) {
280          error_report("unable to find CPU model '%s'", model_pieces[0]);
281          g_strfreev(model_pieces);
282          exit(EXIT_FAILURE);
283      }
284  
285      cpu_type = object_class_get_name(oc);
286      cc = CPU_CLASS(oc);
287      cc->parse_features(cpu_type, model_pieces[1], &error_fatal);
288      g_strfreev(model_pieces);
289      return cpu_type;
290  }
291  
292  #ifndef cpu_list
293  static void cpu_list_entry(gpointer data, gpointer user_data)
294  {
295      CPUClass *cc = CPU_CLASS(OBJECT_CLASS(data));
296      const char *typename = object_class_get_name(OBJECT_CLASS(data));
297      g_autofree char *model = cpu_model_from_type(typename);
298  
299      if (cc->deprecation_note) {
300          qemu_printf("  %s (deprecated)\n", model);
301      } else {
302          qemu_printf("  %s\n", model);
303      }
304  }
305  
306  static void cpu_list(void)
307  {
308      GSList *list;
309  
310      list = object_class_get_list_sorted(TYPE_CPU, false);
311      qemu_printf("Available CPUs:\n");
312      g_slist_foreach(list, cpu_list_entry, NULL);
313      g_slist_free(list);
314  }
315  #endif
316  
317  void list_cpus(void)
318  {
319      cpu_list();
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  
329  #if !defined(CONFIG_USER_ONLY)
330          const AccelOpsClass *ops = cpus_get_accel();
331          if (ops->update_guest_debug) {
332              ops->update_guest_debug(cpu);
333          }
334  #endif
335  
336          trace_breakpoint_singlestep(cpu->cpu_index, enabled);
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_trylock();
353          if (logfile) {
354              fprintf(logfile, "qemu: fatal: ");
355              vfprintf(logfile, fmt, ap2);
356              fprintf(logfile, "\n");
357              cpu_dump_state(cpu, logfile, CPU_DUMP_FPU | CPU_DUMP_CCOP);
358              qemu_log_unlock(logfile);
359          }
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, vaddr addr,
379                          void *ptr, size_t len, bool is_write)
380  {
381      int flags;
382      vaddr l, page;
383      void * p;
384      uint8_t *buf = ptr;
385      ssize_t written;
386      int ret = -1;
387      int fd = -1;
388  
389      while (len > 0) {
390          page = addr & TARGET_PAGE_MASK;
391          l = (page + TARGET_PAGE_SIZE) - addr;
392          if (l > len)
393              l = len;
394          flags = page_get_flags(page);
395          if (!(flags & PAGE_VALID)) {
396              goto out_close;
397          }
398          if (is_write) {
399              if (flags & PAGE_WRITE) {
400                  /* XXX: this code should not depend on lock_user */
401                  p = lock_user(VERIFY_WRITE, addr, l, 0);
402                  if (!p) {
403                      goto out_close;
404                  }
405                  memcpy(p, buf, l);
406                  unlock_user(p, addr, l);
407              } else {
408                  /* Bypass the host page protection using ptrace. */
409                  if (fd == -1) {
410                      fd = open("/proc/self/mem", O_WRONLY);
411                      if (fd == -1) {
412                          goto out;
413                      }
414                  }
415                  /*
416                   * If there is a TranslationBlock and we weren't bypassing the
417                   * host page protection, the memcpy() above would SEGV,
418                   * ultimately leading to page_unprotect(). So invalidate the
419                   * translations manually. Both invalidation and pwrite() must
420                   * be under mmap_lock() in order to prevent the creation of
421                   * another TranslationBlock in between.
422                   */
423                  mmap_lock();
424                  tb_invalidate_phys_range(addr, addr + l - 1);
425                  written = pwrite(fd, buf, l,
426                                   (off_t)(uintptr_t)g2h_untagged(addr));
427                  mmap_unlock();
428                  if (written != l) {
429                      goto out_close;
430                  }
431              }
432          } else if (flags & PAGE_READ) {
433              /* XXX: this code should not depend on lock_user */
434              p = lock_user(VERIFY_READ, addr, l, 1);
435              if (!p) {
436                  goto out_close;
437              }
438              memcpy(buf, p, l);
439              unlock_user(p, addr, 0);
440          } else {
441              /* Bypass the host page protection using ptrace. */
442              if (fd == -1) {
443                  fd = open("/proc/self/mem", O_RDONLY);
444                  if (fd == -1) {
445                      goto out;
446                  }
447              }
448              if (pread(fd, buf, l,
449                        (off_t)(uintptr_t)g2h_untagged(addr)) != l) {
450                  goto out_close;
451              }
452          }
453          len -= l;
454          buf += l;
455          addr += l;
456      }
457      ret = 0;
458  out_close:
459      if (fd != -1) {
460          close(fd);
461      }
462  out:
463      return ret;
464  }
465  #endif
466  
467  bool target_words_bigendian(void)
468  {
469      return TARGET_BIG_ENDIAN;
470  }
471  
472  const char *target_name(void)
473  {
474      return TARGET_NAME;
475  }
476