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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 "hw/qdev-core.h" | |
25 | #include "hw/qdev-properties.h" | |
26 | #include "qemu/error-report.h" | |
27 | #include "migration/vmstate.h" | |
28 | #ifdef CONFIG_USER_ONLY | |
29 | #include "qemu.h" | |
30 | #else | |
31 | #include "hw/core/sysemu-cpu-ops.h" | |
32 | #include "exec/address-spaces.h" | |
33 | #endif | |
34 | #include "sysemu/cpus.h" | |
35 | #include "sysemu/tcg.h" | |
36 | #include "exec/replay-core.h" | |
37 | #include "exec/cpu-common.h" | |
38 | #include "exec/exec-all.h" | |
39 | #include "exec/tb-flush.h" | |
40 | #include "exec/translate-all.h" | |
41 | #include "exec/log.h" | |
42 | #include "hw/core/accel-cpu.h" | |
43 | #include "trace/trace-root.h" | |
44 | #include "qemu/accel.h" | |
45 | #include "qemu/plugin.h" | |
46 | ||
47 | uintptr_t qemu_host_page_size; | |
48 | intptr_t qemu_host_page_mask; | |
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 = (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 = (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 = (VMStateField[]) { | |
122 | VMSTATE_UINT32(halted, CPUState), | |
123 | VMSTATE_UINT32(interrupt_request, CPUState), | |
124 | VMSTATE_END_OF_LIST() | |
125 | }, | |
126 | .subsections = (const VMStateDescription*[]) { | |
127 | &vmstate_cpu_common_exception_index, | |
128 | &vmstate_cpu_common_crash_occurred, | |
129 | NULL | |
130 | } | |
131 | }; | |
132 | #endif | |
133 | ||
134 | void 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_realizefn(cpu, errp)) { | |
140 | return; | |
141 | } | |
142 | ||
143 | /* NB: errp parameter is unused currently */ | |
144 | if (tcg_enabled()) { | |
145 | tcg_exec_realizefn(cpu, errp); | |
146 | } | |
147 | ||
148 | /* Wait until cpu initialization complete before exposing cpu. */ | |
149 | cpu_list_add(cpu); | |
150 | ||
151 | /* Plugin initialization must wait until cpu_index assigned. */ | |
152 | if (tcg_enabled()) { | |
153 | qemu_plugin_vcpu_init_hook(cpu); | |
154 | } | |
155 | ||
156 | #ifdef CONFIG_USER_ONLY | |
157 | assert(qdev_get_vmsd(DEVICE(cpu)) == NULL || | |
158 | qdev_get_vmsd(DEVICE(cpu))->unmigratable); | |
159 | #else | |
160 | if (qdev_get_vmsd(DEVICE(cpu)) == NULL) { | |
161 | vmstate_register(NULL, cpu->cpu_index, &vmstate_cpu_common, cpu); | |
162 | } | |
163 | if (cpu->cc->sysemu_ops->legacy_vmsd != NULL) { | |
164 | vmstate_register(NULL, cpu->cpu_index, cpu->cc->sysemu_ops->legacy_vmsd, cpu); | |
165 | } | |
166 | #endif /* CONFIG_USER_ONLY */ | |
167 | } | |
168 | ||
169 | void cpu_exec_unrealizefn(CPUState *cpu) | |
170 | { | |
171 | #ifndef CONFIG_USER_ONLY | |
172 | CPUClass *cc = CPU_GET_CLASS(cpu); | |
173 | ||
174 | if (cc->sysemu_ops->legacy_vmsd != NULL) { | |
175 | vmstate_unregister(NULL, cc->sysemu_ops->legacy_vmsd, cpu); | |
176 | } | |
177 | if (qdev_get_vmsd(DEVICE(cpu)) == NULL) { | |
178 | vmstate_unregister(NULL, &vmstate_cpu_common, cpu); | |
179 | } | |
180 | #endif | |
181 | ||
182 | /* Call the plugin hook before clearing cpu->cpu_index in cpu_list_remove */ | |
183 | if (tcg_enabled()) { | |
184 | qemu_plugin_vcpu_exit_hook(cpu); | |
185 | } | |
186 | ||
187 | cpu_list_remove(cpu); | |
188 | /* | |
189 | * Now that the vCPU has been removed from the RCU list, we can call | |
190 | * tcg_exec_unrealizefn, which may free fields using call_rcu. | |
191 | */ | |
192 | if (tcg_enabled()) { | |
193 | tcg_exec_unrealizefn(cpu); | |
194 | } | |
195 | } | |
196 | ||
197 | /* | |
198 | * This can't go in hw/core/cpu.c because that file is compiled only | |
199 | * once for both user-mode and system builds. | |
200 | */ | |
201 | static Property cpu_common_props[] = { | |
202 | #ifdef CONFIG_USER_ONLY | |
203 | /* | |
204 | * Create a property for the user-only object, so users can | |
205 | * adjust prctl(PR_SET_UNALIGN) from the command-line. | |
206 | * Has no effect if the target does not support the feature. | |
207 | */ | |
208 | DEFINE_PROP_BOOL("prctl-unalign-sigbus", CPUState, | |
209 | prctl_unalign_sigbus, false), | |
210 | #else | |
211 | /* | |
212 | * Create a memory property for softmmu CPU object, so users can | |
213 | * wire up its memory. The default if no link is set up is to use | |
214 | * the system address space. | |
215 | */ | |
216 | DEFINE_PROP_LINK("memory", CPUState, memory, TYPE_MEMORY_REGION, | |
217 | MemoryRegion *), | |
218 | #endif | |
219 | DEFINE_PROP_END_OF_LIST(), | |
220 | }; | |
221 | ||
222 | static bool cpu_get_start_powered_off(Object *obj, Error **errp) | |
223 | { | |
224 | CPUState *cpu = CPU(obj); | |
225 | return cpu->start_powered_off; | |
226 | } | |
227 | ||
228 | static void cpu_set_start_powered_off(Object *obj, bool value, Error **errp) | |
229 | { | |
230 | CPUState *cpu = CPU(obj); | |
231 | cpu->start_powered_off = value; | |
232 | } | |
233 | ||
234 | void cpu_class_init_props(DeviceClass *dc) | |
235 | { | |
236 | ObjectClass *oc = OBJECT_CLASS(dc); | |
237 | ||
238 | device_class_set_props(dc, cpu_common_props); | |
239 | /* | |
240 | * We can't use DEFINE_PROP_BOOL in the Property array for this | |
241 | * property, because we want this to be settable after realize. | |
242 | */ | |
243 | object_class_property_add_bool(oc, "start-powered-off", | |
244 | cpu_get_start_powered_off, | |
245 | cpu_set_start_powered_off); | |
246 | } | |
247 | ||
248 | void cpu_exec_initfn(CPUState *cpu) | |
249 | { | |
250 | cpu->as = NULL; | |
251 | cpu->num_ases = 0; | |
252 | ||
253 | #ifndef CONFIG_USER_ONLY | |
254 | cpu->thread_id = qemu_get_thread_id(); | |
255 | cpu->memory = get_system_memory(); | |
256 | object_ref(OBJECT(cpu->memory)); | |
257 | #endif | |
258 | } | |
259 | ||
260 | const char *parse_cpu_option(const char *cpu_option) | |
261 | { | |
262 | ObjectClass *oc; | |
263 | CPUClass *cc; | |
264 | gchar **model_pieces; | |
265 | const char *cpu_type; | |
266 | ||
267 | model_pieces = g_strsplit(cpu_option, ",", 2); | |
268 | if (!model_pieces[0]) { | |
269 | error_report("-cpu option cannot be empty"); | |
270 | exit(1); | |
271 | } | |
272 | ||
273 | oc = cpu_class_by_name(CPU_RESOLVING_TYPE, model_pieces[0]); | |
274 | if (oc == NULL) { | |
275 | error_report("unable to find CPU model '%s'", model_pieces[0]); | |
276 | g_strfreev(model_pieces); | |
277 | exit(EXIT_FAILURE); | |
278 | } | |
279 | ||
280 | cpu_type = object_class_get_name(oc); | |
281 | cc = CPU_CLASS(oc); | |
282 | cc->parse_features(cpu_type, model_pieces[1], &error_fatal); | |
283 | g_strfreev(model_pieces); | |
284 | return cpu_type; | |
285 | } | |
286 | ||
287 | void list_cpus(const char *optarg) | |
288 | { | |
289 | /* XXX: implement xxx_cpu_list for targets that still miss it */ | |
290 | #if defined(cpu_list) | |
291 | cpu_list(); | |
292 | #endif | |
293 | } | |
294 | ||
295 | #if defined(CONFIG_USER_ONLY) | |
296 | void tb_invalidate_phys_addr(target_ulong addr) | |
297 | { | |
298 | mmap_lock(); | |
299 | tb_invalidate_phys_page(addr); | |
300 | mmap_unlock(); | |
301 | } | |
302 | #else | |
303 | void tb_invalidate_phys_addr(AddressSpace *as, hwaddr addr, MemTxAttrs attrs) | |
304 | { | |
305 | ram_addr_t ram_addr; | |
306 | MemoryRegion *mr; | |
307 | hwaddr l = 1; | |
308 | ||
309 | if (!tcg_enabled()) { | |
310 | return; | |
311 | } | |
312 | ||
313 | RCU_READ_LOCK_GUARD(); | |
314 | mr = address_space_translate(as, addr, &addr, &l, false, attrs); | |
315 | if (!(memory_region_is_ram(mr) | |
316 | || memory_region_is_romd(mr))) { | |
317 | return; | |
318 | } | |
319 | ram_addr = memory_region_get_ram_addr(mr) + addr; | |
320 | tb_invalidate_phys_page(ram_addr); | |
321 | } | |
322 | #endif | |
323 | ||
324 | /* enable or disable single step mode. EXCP_DEBUG is returned by the | |
325 | CPU loop after each instruction */ | |
326 | void cpu_single_step(CPUState *cpu, int enabled) | |
327 | { | |
328 | if (cpu->singlestep_enabled != enabled) { | |
329 | cpu->singlestep_enabled = enabled; | |
330 | ||
331 | #if !defined(CONFIG_USER_ONLY) | |
332 | const AccelOpsClass *ops = cpus_get_accel(); | |
333 | if (ops->update_guest_debug) { | |
334 | ops->update_guest_debug(cpu); | |
335 | } | |
336 | #endif | |
337 | ||
338 | trace_breakpoint_singlestep(cpu->cpu_index, enabled); | |
339 | } | |
340 | } | |
341 | ||
342 | void cpu_abort(CPUState *cpu, const char *fmt, ...) | |
343 | { | |
344 | va_list ap; | |
345 | va_list ap2; | |
346 | ||
347 | va_start(ap, fmt); | |
348 | va_copy(ap2, ap); | |
349 | fprintf(stderr, "qemu: fatal: "); | |
350 | vfprintf(stderr, fmt, ap); | |
351 | fprintf(stderr, "\n"); | |
352 | cpu_dump_state(cpu, stderr, CPU_DUMP_FPU | CPU_DUMP_CCOP); | |
353 | if (qemu_log_separate()) { | |
354 | FILE *logfile = qemu_log_trylock(); | |
355 | if (logfile) { | |
356 | fprintf(logfile, "qemu: fatal: "); | |
357 | vfprintf(logfile, fmt, ap2); | |
358 | fprintf(logfile, "\n"); | |
359 | cpu_dump_state(cpu, logfile, CPU_DUMP_FPU | CPU_DUMP_CCOP); | |
360 | qemu_log_unlock(logfile); | |
361 | } | |
362 | } | |
363 | va_end(ap2); | |
364 | va_end(ap); | |
365 | replay_finish(); | |
366 | #if defined(CONFIG_USER_ONLY) | |
367 | { | |
368 | struct sigaction act; | |
369 | sigfillset(&act.sa_mask); | |
370 | act.sa_handler = SIG_DFL; | |
371 | act.sa_flags = 0; | |
372 | sigaction(SIGABRT, &act, NULL); | |
373 | } | |
374 | #endif | |
375 | abort(); | |
376 | } | |
377 | ||
378 | /* physical memory access (slow version, mainly for debug) */ | |
379 | #if defined(CONFIG_USER_ONLY) | |
380 | int cpu_memory_rw_debug(CPUState *cpu, vaddr addr, | |
381 | void *ptr, size_t len, bool is_write) | |
382 | { | |
383 | int flags; | |
384 | vaddr l, page; | |
385 | void * p; | |
386 | uint8_t *buf = ptr; | |
387 | ||
388 | while (len > 0) { | |
389 | page = addr & TARGET_PAGE_MASK; | |
390 | l = (page + TARGET_PAGE_SIZE) - addr; | |
391 | if (l > len) | |
392 | l = len; | |
393 | flags = page_get_flags(page); | |
394 | if (!(flags & PAGE_VALID)) | |
395 | return -1; | |
396 | if (is_write) { | |
397 | if (!(flags & PAGE_WRITE)) | |
398 | return -1; | |
399 | /* XXX: this code should not depend on lock_user */ | |
400 | if (!(p = lock_user(VERIFY_WRITE, addr, l, 0))) | |
401 | return -1; | |
402 | memcpy(p, buf, l); | |
403 | unlock_user(p, addr, l); | |
404 | } else { | |
405 | if (!(flags & PAGE_READ)) | |
406 | return -1; | |
407 | /* XXX: this code should not depend on lock_user */ | |
408 | if (!(p = lock_user(VERIFY_READ, addr, l, 1))) | |
409 | return -1; | |
410 | memcpy(buf, p, l); | |
411 | unlock_user(p, addr, 0); | |
412 | } | |
413 | len -= l; | |
414 | buf += l; | |
415 | addr += l; | |
416 | } | |
417 | return 0; | |
418 | } | |
419 | #endif | |
420 | ||
421 | bool target_words_bigendian(void) | |
422 | { | |
423 | #if TARGET_BIG_ENDIAN | |
424 | return true; | |
425 | #else | |
426 | return false; | |
427 | #endif | |
428 | } | |
429 | ||
430 | void page_size_init(void) | |
431 | { | |
432 | /* NOTE: we can always suppose that qemu_host_page_size >= | |
433 | TARGET_PAGE_SIZE */ | |
434 | if (qemu_host_page_size == 0) { | |
435 | qemu_host_page_size = qemu_real_host_page_size(); | |
436 | } | |
437 | if (qemu_host_page_size < TARGET_PAGE_SIZE) { | |
438 | qemu_host_page_size = TARGET_PAGE_SIZE; | |
439 | } | |
440 | qemu_host_page_mask = -(intptr_t)qemu_host_page_size; | |
441 | } |