1 /*
2 * QEMU CPU model
3 *
4 * Copyright (c) 2012-2014 SUSE LINUX Products GmbH
5 *
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License
8 * as published by the Free Software Foundation; either version 2
9 * of the License, or (at your option) any later version.
10 *
11 * This program 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
14 * GNU General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, see
18 * <http://www.gnu.org/licenses/gpl-2.0.html>
19 */
20
21 #include "qemu/osdep.h"
22 #include "qapi/error.h"
23 #include "hw/core/cpu.h"
24 #include "sysemu/hw_accel.h"
25 #include "qemu/log.h"
26 #include "qemu/main-loop.h"
27 #include "qemu/lockcnt.h"
28 #include "exec/log.h"
29 #include "exec/gdbstub.h"
30 #include "sysemu/tcg.h"
31 #include "hw/boards.h"
32 #include "hw/qdev-properties.h"
33 #include "trace.h"
34 #ifdef CONFIG_PLUGIN
35 #include "qemu/plugin.h"
36 #endif
37
cpu_by_arch_id(int64_t id)38 CPUState *cpu_by_arch_id(int64_t id)
39 {
40 CPUState *cpu;
41
42 CPU_FOREACH(cpu) {
43 CPUClass *cc = CPU_GET_CLASS(cpu);
44
45 if (cc->get_arch_id(cpu) == id) {
46 return cpu;
47 }
48 }
49 return NULL;
50 }
51
cpu_exists(int64_t id)52 bool cpu_exists(int64_t id)
53 {
54 return !!cpu_by_arch_id(id);
55 }
56
cpu_create(const char * typename)57 CPUState *cpu_create(const char *typename)
58 {
59 Error *err = NULL;
60 CPUState *cpu = CPU(object_new(typename));
61 if (!qdev_realize(DEVICE(cpu), NULL, &err)) {
62 error_report_err(err);
63 object_unref(OBJECT(cpu));
64 exit(EXIT_FAILURE);
65 }
66 return cpu;
67 }
68
69 /* Resetting the IRQ comes from across the code base so we take the
70 * BQL here if we need to. cpu_interrupt assumes it is held.*/
cpu_reset_interrupt(CPUState * cpu,int mask)71 void cpu_reset_interrupt(CPUState *cpu, int mask)
72 {
73 bool need_lock = !bql_locked();
74
75 if (need_lock) {
76 bql_lock();
77 }
78 cpu->interrupt_request &= ~mask;
79 if (need_lock) {
80 bql_unlock();
81 }
82 }
83
cpu_exit(CPUState * cpu)84 void cpu_exit(CPUState *cpu)
85 {
86 qatomic_set(&cpu->exit_request, 1);
87 /* Ensure cpu_exec will see the exit request after TCG has exited. */
88 smp_wmb();
89 qatomic_set(&cpu->neg.icount_decr.u16.high, -1);
90 }
91
cpu_common_gdb_read_register(CPUState * cpu,GByteArray * buf,int reg)92 static int cpu_common_gdb_read_register(CPUState *cpu, GByteArray *buf, int reg)
93 {
94 return 0;
95 }
96
cpu_common_gdb_write_register(CPUState * cpu,uint8_t * buf,int reg)97 static int cpu_common_gdb_write_register(CPUState *cpu, uint8_t *buf, int reg)
98 {
99 return 0;
100 }
101
cpu_dump_state(CPUState * cpu,FILE * f,int flags)102 void cpu_dump_state(CPUState *cpu, FILE *f, int flags)
103 {
104 CPUClass *cc = CPU_GET_CLASS(cpu);
105
106 if (cc->dump_state) {
107 cpu_synchronize_state(cpu);
108 cc->dump_state(cpu, f, flags);
109 }
110 }
111
cpu_reset(CPUState * cpu)112 void cpu_reset(CPUState *cpu)
113 {
114 device_cold_reset(DEVICE(cpu));
115
116 trace_cpu_reset(cpu->cpu_index);
117 }
118
cpu_common_reset_hold(Object * obj,ResetType type)119 static void cpu_common_reset_hold(Object *obj, ResetType type)
120 {
121 CPUState *cpu = CPU(obj);
122 CPUClass *cc = CPU_GET_CLASS(cpu);
123
124 if (qemu_loglevel_mask(CPU_LOG_RESET)) {
125 qemu_log("CPU Reset (CPU %d)\n", cpu->cpu_index);
126 log_cpu_state(cpu, cc->reset_dump_flags);
127 }
128
129 cpu->interrupt_request = 0;
130 cpu->halted = cpu->start_powered_off;
131 cpu->mem_io_pc = 0;
132 cpu->icount_extra = 0;
133 qatomic_set(&cpu->neg.icount_decr.u32, 0);
134 cpu->neg.can_do_io = true;
135 cpu->exception_index = -1;
136 cpu->crash_occurred = false;
137 cpu->cflags_next_tb = -1;
138
139 cpu_exec_reset_hold(cpu);
140 }
141
cpu_common_has_work(CPUState * cs)142 static bool cpu_common_has_work(CPUState *cs)
143 {
144 return false;
145 }
146
cpu_class_by_name(const char * typename,const char * cpu_model)147 ObjectClass *cpu_class_by_name(const char *typename, const char *cpu_model)
148 {
149 ObjectClass *oc;
150 CPUClass *cc;
151
152 oc = object_class_by_name(typename);
153 cc = CPU_CLASS(oc);
154 assert(cc->class_by_name);
155 assert(cpu_model);
156 oc = cc->class_by_name(cpu_model);
157 if (object_class_dynamic_cast(oc, typename) &&
158 !object_class_is_abstract(oc)) {
159 return oc;
160 }
161
162 return NULL;
163 }
164
cpu_common_parse_features(const char * typename,char * features,Error ** errp)165 static void cpu_common_parse_features(const char *typename, char *features,
166 Error **errp)
167 {
168 char *val;
169 static bool cpu_globals_initialized;
170 /* Single "key=value" string being parsed */
171 char *featurestr = features ? strtok(features, ",") : NULL;
172
173 /* should be called only once, catch invalid users */
174 assert(!cpu_globals_initialized);
175 cpu_globals_initialized = true;
176
177 while (featurestr) {
178 val = strchr(featurestr, '=');
179 if (val) {
180 GlobalProperty *prop = g_new0(typeof(*prop), 1);
181 *val = 0;
182 val++;
183 prop->driver = typename;
184 prop->property = g_strdup(featurestr);
185 prop->value = g_strdup(val);
186 qdev_prop_register_global(prop);
187 } else {
188 error_setg(errp, "Expected key=value format, found %s.",
189 featurestr);
190 return;
191 }
192 featurestr = strtok(NULL, ",");
193 }
194 }
195
cpu_common_realizefn(DeviceState * dev,Error ** errp)196 static void cpu_common_realizefn(DeviceState *dev, Error **errp)
197 {
198 CPUState *cpu = CPU(dev);
199 Object *machine = qdev_get_machine();
200
201 /* qdev_get_machine() can return something that's not TYPE_MACHINE
202 * if this is one of the user-only emulators; in that case there's
203 * no need to check the ignore_memory_transaction_failures board flag.
204 */
205 if (object_dynamic_cast(machine, TYPE_MACHINE)) {
206 MachineClass *mc = MACHINE_GET_CLASS(machine);
207
208 if (mc) {
209 cpu->ignore_memory_transaction_failures =
210 mc->ignore_memory_transaction_failures;
211 }
212 }
213
214 if (dev->hotplugged) {
215 cpu_synchronize_post_init(cpu);
216 cpu_resume(cpu);
217 }
218
219 /* NOTE: latest generic point where the cpu is fully realized */
220 }
221
cpu_common_unrealizefn(DeviceState * dev)222 static void cpu_common_unrealizefn(DeviceState *dev)
223 {
224 CPUState *cpu = CPU(dev);
225
226 /* Call the plugin hook before clearing the cpu is fully unrealized */
227 #ifdef CONFIG_PLUGIN
228 if (tcg_enabled()) {
229 qemu_plugin_vcpu_exit_hook(cpu);
230 }
231 #endif
232
233 /* NOTE: latest generic point before the cpu is fully unrealized */
234 cpu_exec_unrealizefn(cpu);
235 }
236
cpu_common_initfn(Object * obj)237 static void cpu_common_initfn(Object *obj)
238 {
239 CPUState *cpu = CPU(obj);
240
241 gdb_init_cpu(cpu);
242 cpu->cpu_index = UNASSIGNED_CPU_INDEX;
243 cpu->cluster_index = UNASSIGNED_CLUSTER_INDEX;
244 /* user-mode doesn't have configurable SMP topology */
245 /* the default value is changed by qemu_init_vcpu() for system-mode */
246 cpu->nr_cores = 1;
247 cpu->nr_threads = 1;
248 cpu->cflags_next_tb = -1;
249
250 /* allocate storage for thread info, initialise condition variables */
251 cpu->thread = g_new0(QemuThread, 1);
252 cpu->halt_cond = g_new0(QemuCond, 1);
253 qemu_cond_init(cpu->halt_cond);
254
255 qemu_mutex_init(&cpu->work_mutex);
256 qemu_lockcnt_init(&cpu->in_ioctl_lock);
257 QSIMPLEQ_INIT(&cpu->work_list);
258 QTAILQ_INIT(&cpu->breakpoints);
259 QTAILQ_INIT(&cpu->watchpoints);
260
261 cpu_exec_initfn(cpu);
262
263 /*
264 * Plugin initialization must wait until the cpu start executing
265 * code, but we must queue this work before the threads are
266 * created to ensure we don't race.
267 */
268 #ifdef CONFIG_PLUGIN
269 if (tcg_enabled()) {
270 cpu->plugin_state = qemu_plugin_create_vcpu_state();
271 qemu_plugin_vcpu_init_hook(cpu);
272 }
273 #endif
274 }
275
cpu_common_finalize(Object * obj)276 static void cpu_common_finalize(Object *obj)
277 {
278 CPUState *cpu = CPU(obj);
279
280 #ifdef CONFIG_PLUGIN
281 if (tcg_enabled()) {
282 g_free(cpu->plugin_state);
283 }
284 #endif
285 free_queued_cpu_work(cpu);
286 /* If cleanup didn't happen in context to gdb_unregister_coprocessor_all */
287 if (cpu->gdb_regs) {
288 g_array_free(cpu->gdb_regs, TRUE);
289 }
290 qemu_lockcnt_destroy(&cpu->in_ioctl_lock);
291 qemu_mutex_destroy(&cpu->work_mutex);
292 qemu_cond_destroy(cpu->halt_cond);
293 g_free(cpu->halt_cond);
294 g_free(cpu->thread);
295 }
296
cpu_common_get_arch_id(CPUState * cpu)297 static int64_t cpu_common_get_arch_id(CPUState *cpu)
298 {
299 return cpu->cpu_index;
300 }
301
cpu_common_class_init(ObjectClass * klass,void * data)302 static void cpu_common_class_init(ObjectClass *klass, void *data)
303 {
304 DeviceClass *dc = DEVICE_CLASS(klass);
305 ResettableClass *rc = RESETTABLE_CLASS(klass);
306 CPUClass *k = CPU_CLASS(klass);
307
308 k->parse_features = cpu_common_parse_features;
309 k->get_arch_id = cpu_common_get_arch_id;
310 k->has_work = cpu_common_has_work;
311 k->gdb_read_register = cpu_common_gdb_read_register;
312 k->gdb_write_register = cpu_common_gdb_write_register;
313 set_bit(DEVICE_CATEGORY_CPU, dc->categories);
314 dc->realize = cpu_common_realizefn;
315 dc->unrealize = cpu_common_unrealizefn;
316 rc->phases.hold = cpu_common_reset_hold;
317 cpu_class_init_props(dc);
318 /*
319 * Reason: CPUs still need special care by board code: wiring up
320 * IRQs, adding reset handlers, halting non-first CPUs, ...
321 */
322 dc->user_creatable = false;
323 }
324
325 static const TypeInfo cpu_type_info = {
326 .name = TYPE_CPU,
327 .parent = TYPE_DEVICE,
328 .instance_size = sizeof(CPUState),
329 .instance_init = cpu_common_initfn,
330 .instance_finalize = cpu_common_finalize,
331 .abstract = true,
332 .class_size = sizeof(CPUClass),
333 .class_init = cpu_common_class_init,
334 };
335
cpu_register_types(void)336 static void cpu_register_types(void)
337 {
338 type_register_static(&cpu_type_info);
339 }
340
341 type_init(cpu_register_types)
342