xref: /openbmc/qemu/target/s390x/cpu.c (revision f15f7273ea55472d5904c53566c82369d81214c1)
1  /*
2   * QEMU S/390 CPU
3   *
4   * Copyright (c) 2009 Ulrich Hecht
5   * Copyright (c) 2011 Alexander Graf
6   * Copyright (c) 2012 SUSE LINUX Products GmbH
7   * Copyright (c) 2012 IBM Corp.
8   *
9   * This program is free software; you can redistribute it and/or modify
10   * it under the terms of the GNU General Public License as published by
11   * the Free Software Foundation; either version 2 of the License, or
12   * (at your option) any later version.
13   *
14   * This program is distributed in the hope that it will be useful,
15   * but WITHOUT ANY WARRANTY; without even the implied warranty of
16   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
17   * General Public License for more details.
18   *
19   * You should have received a copy of the GNU General Public License
20   * along with this program; if not, see <http://www.gnu.org/licenses/>.
21   */
22  
23  #include "qemu/osdep.h"
24  #include "qapi/error.h"
25  #include "cpu.h"
26  #include "s390x-internal.h"
27  #include "kvm/kvm_s390x.h"
28  #include "sysemu/kvm.h"
29  #include "qemu/module.h"
30  #include "trace.h"
31  #include "qapi/qapi-types-machine.h"
32  #include "sysemu/hw_accel.h"
33  #include "hw/qdev-properties.h"
34  #include "hw/qdev-properties-system.h"
35  #include "hw/resettable.h"
36  #include "fpu/softfloat-helpers.h"
37  #include "disas/capstone.h"
38  #include "sysemu/tcg.h"
39  #ifndef CONFIG_USER_ONLY
40  #include "sysemu/reset.h"
41  #endif
42  #include "hw/s390x/cpu-topology.h"
43  
44  #define CR0_RESET       0xE0UL
45  #define CR14_RESET      0xC2000000UL;
46  
47  #ifndef CONFIG_USER_ONLY
is_early_exception_psw(uint64_t mask,uint64_t addr)48  static bool is_early_exception_psw(uint64_t mask, uint64_t addr)
49  {
50      if (mask & PSW_MASK_RESERVED) {
51          return true;
52      }
53  
54      switch (mask & (PSW_MASK_32 | PSW_MASK_64)) {
55      case 0:
56          return addr & ~0xffffffULL;
57      case PSW_MASK_32:
58          return addr & ~0x7fffffffULL;
59      case PSW_MASK_32 | PSW_MASK_64:
60          return false;
61      default: /* PSW_MASK_64 */
62          return true;
63      }
64  }
65  #endif
66  
s390_cpu_set_psw(CPUS390XState * env,uint64_t mask,uint64_t addr)67  void s390_cpu_set_psw(CPUS390XState *env, uint64_t mask, uint64_t addr)
68  {
69  #ifndef CONFIG_USER_ONLY
70      uint64_t old_mask = env->psw.mask;
71  #endif
72  
73      env->psw.addr = addr;
74      env->psw.mask = mask;
75  
76      /* KVM will handle all WAITs and trigger a WAIT exit on disabled_wait */
77      if (!tcg_enabled()) {
78          return;
79      }
80      env->cc_op = (mask >> 44) & 3;
81  
82  #ifndef CONFIG_USER_ONLY
83      if (is_early_exception_psw(mask, addr)) {
84          env->int_pgm_ilen = 0;
85          trigger_pgm_exception(env, PGM_SPECIFICATION);
86          return;
87      }
88  
89      if ((old_mask ^ mask) & PSW_MASK_PER) {
90          s390_cpu_recompute_watchpoints(env_cpu(env));
91      }
92  
93      if (mask & PSW_MASK_WAIT) {
94          s390_handle_wait(env_archcpu(env));
95      }
96  #endif
97  }
98  
s390_cpu_get_psw_mask(CPUS390XState * env)99  uint64_t s390_cpu_get_psw_mask(CPUS390XState *env)
100  {
101      uint64_t r = env->psw.mask;
102  
103      if (tcg_enabled()) {
104          uint64_t cc = calc_cc(env, env->cc_op, env->cc_src,
105                                env->cc_dst, env->cc_vr);
106  
107          assert(cc <= 3);
108          r &= ~PSW_MASK_CC;
109          r |= cc << 44;
110      }
111  
112      return r;
113  }
114  
s390_cpu_set_pc(CPUState * cs,vaddr value)115  static void s390_cpu_set_pc(CPUState *cs, vaddr value)
116  {
117      S390CPU *cpu = S390_CPU(cs);
118  
119      cpu->env.psw.addr = value;
120  }
121  
s390_cpu_get_pc(CPUState * cs)122  static vaddr s390_cpu_get_pc(CPUState *cs)
123  {
124      S390CPU *cpu = S390_CPU(cs);
125  
126      return cpu->env.psw.addr;
127  }
128  
s390_cpu_has_work(CPUState * cs)129  static bool s390_cpu_has_work(CPUState *cs)
130  {
131      S390CPU *cpu = S390_CPU(cs);
132  
133      /* STOPPED cpus can never wake up */
134      if (s390_cpu_get_state(cpu) != S390_CPU_STATE_LOAD &&
135          s390_cpu_get_state(cpu) != S390_CPU_STATE_OPERATING) {
136          return false;
137      }
138  
139      if (!(cs->interrupt_request & CPU_INTERRUPT_HARD)) {
140          return false;
141      }
142  
143      return s390_cpu_has_int(cpu);
144  }
145  
s390x_cpu_mmu_index(CPUState * cs,bool ifetch)146  static int s390x_cpu_mmu_index(CPUState *cs, bool ifetch)
147  {
148      return s390x_env_mmu_index(cpu_env(cs), ifetch);
149  }
150  
s390_query_cpu_fast(CPUState * cpu,CpuInfoFast * value)151  static void s390_query_cpu_fast(CPUState *cpu, CpuInfoFast *value)
152  {
153      S390CPU *s390_cpu = S390_CPU(cpu);
154  
155      value->u.s390x.cpu_state = s390_cpu->env.cpu_state;
156  #if !defined(CONFIG_USER_ONLY)
157      if (s390_has_topology()) {
158          value->u.s390x.has_dedicated = true;
159          value->u.s390x.dedicated = s390_cpu->env.dedicated;
160          value->u.s390x.has_entitlement = true;
161          value->u.s390x.entitlement = s390_cpu->env.entitlement;
162      }
163  #endif
164  }
165  
166  /* S390CPUClass Resettable reset_hold phase method */
s390_cpu_reset_hold(Object * obj,ResetType type)167  static void s390_cpu_reset_hold(Object *obj, ResetType type)
168  {
169      S390CPU *cpu = S390_CPU(obj);
170      S390CPUClass *scc = S390_CPU_GET_CLASS(cpu);
171      CPUS390XState *env = &cpu->env;
172  
173      if (scc->parent_phases.hold) {
174          scc->parent_phases.hold(obj, type);
175      }
176      cpu->env.sigp_order = 0;
177      s390_cpu_set_state(S390_CPU_STATE_STOPPED, cpu);
178  
179      switch (type) {
180      default:
181          /* RESET_TYPE_COLD: power on or "clear" reset */
182          memset(env, 0, offsetof(CPUS390XState, start_initial_reset_fields));
183          /* fall through */
184      case RESET_TYPE_S390_CPU_INITIAL:
185          /* initial reset does not clear everything! */
186          memset(&env->start_initial_reset_fields, 0,
187                 offsetof(CPUS390XState, start_normal_reset_fields) -
188                 offsetof(CPUS390XState, start_initial_reset_fields));
189  
190          /* architectured initial value for Breaking-Event-Address register */
191          env->gbea = 1;
192  
193          /* architectured initial values for CR 0 and 14 */
194          env->cregs[0] = CR0_RESET;
195          env->cregs[14] = CR14_RESET;
196  
197  #if defined(CONFIG_USER_ONLY)
198          /* user mode should always be allowed to use the full FPU */
199          env->cregs[0] |= CR0_AFP;
200          if (s390_has_feat(S390_FEAT_VECTOR)) {
201              env->cregs[0] |= CR0_VECTOR;
202          }
203  #endif
204  
205          /* tininess for underflow is detected before rounding */
206          set_float_detect_tininess(float_tininess_before_rounding,
207                                    &env->fpu_status);
208          set_float_2nan_prop_rule(float_2nan_prop_s_ab, &env->fpu_status);
209         /* fall through */
210      case RESET_TYPE_S390_CPU_NORMAL:
211          env->psw.mask &= ~PSW_MASK_RI;
212          memset(&env->start_normal_reset_fields, 0,
213                 offsetof(CPUS390XState, end_reset_fields) -
214                 offsetof(CPUS390XState, start_normal_reset_fields));
215  
216          env->pfault_token = -1UL;
217          env->bpbc = false;
218          break;
219      }
220  
221      /* Reset state inside the kernel that we cannot access yet from QEMU. */
222      if (kvm_enabled()) {
223          switch (type) {
224          default:
225              kvm_s390_reset_vcpu_clear(cpu);
226              break;
227          case RESET_TYPE_S390_CPU_INITIAL:
228              kvm_s390_reset_vcpu_initial(cpu);
229              break;
230          case RESET_TYPE_S390_CPU_NORMAL:
231              kvm_s390_reset_vcpu_normal(cpu);
232              break;
233          }
234      }
235  }
236  
s390_cpu_disas_set_info(CPUState * cpu,disassemble_info * info)237  static void s390_cpu_disas_set_info(CPUState *cpu, disassemble_info *info)
238  {
239      info->mach = bfd_mach_s390_64;
240      info->cap_arch = CS_ARCH_SYSZ;
241      info->cap_insn_unit = 2;
242      info->cap_insn_split = 6;
243  }
244  
s390_cpu_realizefn(DeviceState * dev,Error ** errp)245  static void s390_cpu_realizefn(DeviceState *dev, Error **errp)
246  {
247      CPUState *cs = CPU(dev);
248      S390CPUClass *scc = S390_CPU_GET_CLASS(dev);
249      Error *err = NULL;
250  
251      /* the model has to be realized before qemu_init_vcpu() due to kvm */
252      s390_realize_cpu_model(cs, &err);
253      if (err) {
254          goto out;
255      }
256  
257  #if !defined(CONFIG_USER_ONLY)
258      if (!s390_cpu_realize_sysemu(dev, &err)) {
259          goto out;
260      }
261  #endif
262  
263      cpu_exec_realizefn(cs, &err);
264      if (err != NULL) {
265          goto out;
266      }
267  
268  #if !defined(CONFIG_USER_ONLY)
269      qemu_register_reset(s390_cpu_machine_reset_cb, S390_CPU(dev));
270  #endif
271      s390_cpu_gdb_init(cs);
272      qemu_init_vcpu(cs);
273  
274      /*
275       * KVM requires the initial CPU reset ioctl to be executed on the target
276       * CPU thread. CPU hotplug under single-threaded TCG will not work with
277       * run_on_cpu(), as run_on_cpu() will not work properly if called while
278       * the main thread is already running but the CPU hasn't been realized.
279       */
280      if (kvm_enabled()) {
281          run_on_cpu(cs, s390_do_cpu_full_reset, RUN_ON_CPU_NULL);
282      } else {
283          cpu_reset(cs);
284      }
285  
286      scc->parent_realize(dev, &err);
287  out:
288      error_propagate(errp, err);
289  }
290  
s390_cpu_initfn(Object * obj)291  static void s390_cpu_initfn(Object *obj)
292  {
293      CPUState *cs = CPU(obj);
294  
295      cs->exception_index = EXCP_HLT;
296  
297  #if !defined(CONFIG_USER_ONLY)
298      s390_cpu_init_sysemu(obj);
299  #endif
300  }
301  
s390_gdb_arch_name(CPUState * cs)302  static const gchar *s390_gdb_arch_name(CPUState *cs)
303  {
304      return "s390:64-bit";
305  }
306  
307  static Property s390x_cpu_properties[] = {
308  #if !defined(CONFIG_USER_ONLY)
309      DEFINE_PROP_UINT32("core-id", S390CPU, env.core_id, 0),
310      DEFINE_PROP_INT32("socket-id", S390CPU, env.socket_id, -1),
311      DEFINE_PROP_INT32("book-id", S390CPU, env.book_id, -1),
312      DEFINE_PROP_INT32("drawer-id", S390CPU, env.drawer_id, -1),
313      DEFINE_PROP_BOOL("dedicated", S390CPU, env.dedicated, false),
314      DEFINE_PROP_CPUS390ENTITLEMENT("entitlement", S390CPU, env.entitlement,
315                                     S390_CPU_ENTITLEMENT_AUTO),
316  #endif
317      DEFINE_PROP_END_OF_LIST()
318  };
319  
320  #ifdef CONFIG_TCG
321  #include "hw/core/tcg-cpu-ops.h"
322  
cpu_get_tb_cpu_state(CPUS390XState * env,vaddr * pc,uint64_t * cs_base,uint32_t * pflags)323  void cpu_get_tb_cpu_state(CPUS390XState *env, vaddr *pc,
324                            uint64_t *cs_base, uint32_t *pflags)
325  {
326      uint32_t flags;
327  
328      if (env->psw.addr & 1) {
329          /*
330           * Instructions must be at even addresses.
331           * This needs to be checked before address translation.
332           */
333          env->int_pgm_ilen = 2; /* see s390_cpu_tlb_fill() */
334          tcg_s390_program_interrupt(env, PGM_SPECIFICATION, 0);
335      }
336  
337      *pc = env->psw.addr;
338      *cs_base = env->ex_value;
339  
340      flags = (env->psw.mask >> FLAG_MASK_PSW_SHIFT) & FLAG_MASK_PSW;
341      if (env->psw.mask & PSW_MASK_PER) {
342          flags |= env->cregs[9] & (FLAG_MASK_PER_BRANCH |
343                                    FLAG_MASK_PER_IFETCH |
344                                    FLAG_MASK_PER_IFETCH_NULLIFY);
345          if ((env->cregs[9] & PER_CR9_EVENT_STORE) &&
346              (env->cregs[9] & PER_CR9_EVENT_STORE_REAL)) {
347              flags |= FLAG_MASK_PER_STORE_REAL;
348          }
349      }
350      if (env->cregs[0] & CR0_AFP) {
351          flags |= FLAG_MASK_AFP;
352      }
353      if (env->cregs[0] & CR0_VECTOR) {
354          flags |= FLAG_MASK_VECTOR;
355      }
356      *pflags = flags;
357  }
358  
359  static const TCGCPUOps s390_tcg_ops = {
360      .initialize = s390x_translate_init,
361      .restore_state_to_opc = s390x_restore_state_to_opc,
362  
363  #ifdef CONFIG_USER_ONLY
364      .record_sigsegv = s390_cpu_record_sigsegv,
365      .record_sigbus = s390_cpu_record_sigbus,
366  #else
367      .tlb_fill = s390_cpu_tlb_fill,
368      .cpu_exec_interrupt = s390_cpu_exec_interrupt,
369      .cpu_exec_halt = s390_cpu_has_work,
370      .do_interrupt = s390_cpu_do_interrupt,
371      .debug_excp_handler = s390x_cpu_debug_excp_handler,
372      .do_unaligned_access = s390x_cpu_do_unaligned_access,
373  #endif /* !CONFIG_USER_ONLY */
374  };
375  #endif /* CONFIG_TCG */
376  
s390_cpu_class_init(ObjectClass * oc,void * data)377  static void s390_cpu_class_init(ObjectClass *oc, void *data)
378  {
379      S390CPUClass *scc = S390_CPU_CLASS(oc);
380      CPUClass *cc = CPU_CLASS(scc);
381      DeviceClass *dc = DEVICE_CLASS(oc);
382      ResettableClass *rc = RESETTABLE_CLASS(oc);
383  
384      device_class_set_parent_realize(dc, s390_cpu_realizefn,
385                                      &scc->parent_realize);
386      device_class_set_props(dc, s390x_cpu_properties);
387      dc->user_creatable = true;
388  
389      resettable_class_set_parent_phases(rc, NULL, s390_cpu_reset_hold, NULL,
390                                         &scc->parent_phases);
391  
392      cc->class_by_name = s390_cpu_class_by_name,
393      cc->has_work = s390_cpu_has_work;
394      cc->mmu_index = s390x_cpu_mmu_index;
395      cc->dump_state = s390_cpu_dump_state;
396      cc->query_cpu_fast = s390_query_cpu_fast;
397      cc->set_pc = s390_cpu_set_pc;
398      cc->get_pc = s390_cpu_get_pc;
399      cc->gdb_read_register = s390_cpu_gdb_read_register;
400      cc->gdb_write_register = s390_cpu_gdb_write_register;
401  #ifndef CONFIG_USER_ONLY
402      s390_cpu_class_init_sysemu(cc);
403  #endif
404      cc->disas_set_info = s390_cpu_disas_set_info;
405      cc->gdb_core_xml_file = "s390x-core64.xml";
406      cc->gdb_arch_name = s390_gdb_arch_name;
407  
408      s390_cpu_model_class_register_props(oc);
409  
410  #ifdef CONFIG_TCG
411      cc->tcg_ops = &s390_tcg_ops;
412  #endif /* CONFIG_TCG */
413  }
414  
415  static const TypeInfo s390_cpu_type_info = {
416      .name = TYPE_S390_CPU,
417      .parent = TYPE_CPU,
418      .instance_size = sizeof(S390CPU),
419      .instance_align = __alignof__(S390CPU),
420      .instance_init = s390_cpu_initfn,
421  
422  #ifndef CONFIG_USER_ONLY
423      .instance_finalize = s390_cpu_finalize,
424  #endif /* !CONFIG_USER_ONLY */
425  
426      .abstract = true,
427      .class_size = sizeof(S390CPUClass),
428      .class_init = s390_cpu_class_init,
429  };
430  
s390_cpu_register_types(void)431  static void s390_cpu_register_types(void)
432  {
433      type_register_static(&s390_cpu_type_info);
434  }
435  
436  type_init(s390_cpu_register_types)
437