target/s390x/cpu.c

   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 "fpu/softfloat-helpers.h"
  36 #include "disas/capstone.h"
  37 #include "sysemu/tcg.h"
  38 #ifndef CONFIG_USER_ONLY
  39 #include "sysemu/reset.h"
  40 #endif
  41 #include "hw/s390x/cpu-topology.h"
  42
  43 #define CR0_RESET       0xE0UL
  44 #define CR14_RESET      0xC2000000UL;
  45
  46 #ifndef CONFIG_USER_ONLY
  47 static bool is_early_exception_psw(uint64_t mask, uint64_t addr)
  48 {
  49     if (mask & PSW_MASK_RESERVED) {
  50         return true;
  51     }
  52
  53     switch (mask & (PSW_MASK_32 | PSW_MASK_64)) {
  54     case 0:
  55         return addr & ~0xffffffULL;
  56     case PSW_MASK_32:
  57         return addr & ~0x7fffffffULL;
  58     case PSW_MASK_32 | PSW_MASK_64:
  59         return false;
  60     default: /* PSW_MASK_64 */
  61         return true;
  62     }
  63 }
  64 #endif
  65
  66 void s390_cpu_set_psw(CPUS390XState *env, uint64_t mask, uint64_t addr)
  67 {
  68 #ifndef CONFIG_USER_ONLY
  69     uint64_t old_mask = env->psw.mask;
  70 #endif
  71
  72     env->psw.addr = addr;
  73     env->psw.mask = mask;
  74
  75     /* KVM will handle all WAITs and trigger a WAIT exit on disabled_wait */
  76     if (!tcg_enabled()) {
  77         return;
  78     }
  79     env->cc_op = (mask >> 44) & 3;
  80
  81 #ifndef CONFIG_USER_ONLY
  82     if (is_early_exception_psw(mask, addr)) {
  83         env->int_pgm_ilen = 0;
  84         trigger_pgm_exception(env, PGM_SPECIFICATION);
  85         return;
  86     }
  87
  88     if ((old_mask ^ mask) & PSW_MASK_PER) {
  89         s390_cpu_recompute_watchpoints(env_cpu(env));
  90     }
  91
  92     if (mask & PSW_MASK_WAIT) {
  93         s390_handle_wait(env_archcpu(env));
  94     }
  95 #endif
  96 }
  97
  98 uint64_t s390_cpu_get_psw_mask(CPUS390XState *env)
  99 {
 100     uint64_t r = env->psw.mask;
 101
 102     if (tcg_enabled()) {
 103         uint64_t cc = calc_cc(env, env->cc_op, env->cc_src,
 104                               env->cc_dst, env->cc_vr);
 105
 106         assert(cc <= 3);
 107         r &= ~PSW_MASK_CC;
 108         r |= cc << 44;
 109     }
 110
 111     return r;
 112 }
 113
 114 static void s390_cpu_set_pc(CPUState *cs, vaddr value)
 115 {
 116     S390CPU *cpu = S390_CPU(cs);
 117
 118     cpu->env.psw.addr = value;
 119 }
 120
 121 static vaddr s390_cpu_get_pc(CPUState *cs)
 122 {
 123     S390CPU *cpu = S390_CPU(cs);
 124
 125     return cpu->env.psw.addr;
 126 }
 127
 128 static bool s390_cpu_has_work(CPUState *cs)
 129 {
 130     S390CPU *cpu = S390_CPU(cs);
 131
 132     /* STOPPED cpus can never wake up */
 133     if (s390_cpu_get_state(cpu) != S390_CPU_STATE_LOAD &&
 134         s390_cpu_get_state(cpu) != S390_CPU_STATE_OPERATING) {
 135         return false;
 136     }
 137
 138     if (!(cs->interrupt_request & CPU_INTERRUPT_HARD)) {
 139         return false;
 140     }
 141
 142     return s390_cpu_has_int(cpu);
 143 }
 144
 145 static void s390_query_cpu_fast(CPUState *cpu, CpuInfoFast *value)
 146 {
 147     S390CPU *s390_cpu = S390_CPU(cpu);
 148
 149     value->u.s390x.cpu_state = s390_cpu->env.cpu_state;
 150 #if !defined(CONFIG_USER_ONLY)
 151     if (s390_has_topology()) {
 152         value->u.s390x.has_dedicated = true;
 153         value->u.s390x.dedicated = s390_cpu->env.dedicated;
 154         value->u.s390x.has_entitlement = true;
 155         value->u.s390x.entitlement = s390_cpu->env.entitlement;
 156     }
 157 #endif
 158 }
 159
 160 /* S390CPUClass::reset() */
 161 static void s390_cpu_reset(CPUState *s, cpu_reset_type type)
 162 {
 163     S390CPU *cpu = S390_CPU(s);
 164     S390CPUClass *scc = S390_CPU_GET_CLASS(cpu);
 165     CPUS390XState *env = &cpu->env;
 166     DeviceState *dev = DEVICE(s);
 167
 168     scc->parent_reset(dev);
 169     cpu->env.sigp_order = 0;
 170     s390_cpu_set_state(S390_CPU_STATE_STOPPED, cpu);
 171
 172     switch (type) {
 173     case S390_CPU_RESET_CLEAR:
 174         memset(env, 0, offsetof(CPUS390XState, start_initial_reset_fields));
 175         /* fall through */
 176     case S390_CPU_RESET_INITIAL:
 177         /* initial reset does not clear everything! */
 178         memset(&env->start_initial_reset_fields, 0,
 179                offsetof(CPUS390XState, start_normal_reset_fields) -
 180                offsetof(CPUS390XState, start_initial_reset_fields));
 181
 182         /* architectured initial value for Breaking-Event-Address register */
 183         env->gbea = 1;
 184
 185         /* architectured initial values for CR 0 and 14 */
 186         env->cregs[0] = CR0_RESET;
 187         env->cregs[14] = CR14_RESET;
 188
 189 #if defined(CONFIG_USER_ONLY)
 190         /* user mode should always be allowed to use the full FPU */
 191         env->cregs[0] |= CR0_AFP;
 192         if (s390_has_feat(S390_FEAT_VECTOR)) {
 193             env->cregs[0] |= CR0_VECTOR;
 194         }
 195 #endif
 196
 197         /* tininess for underflow is detected before rounding */
 198         set_float_detect_tininess(float_tininess_before_rounding,
 199                                   &env->fpu_status);
 200        /* fall through */
 201     case S390_CPU_RESET_NORMAL:
 202         env->psw.mask &= ~PSW_MASK_RI;
 203         memset(&env->start_normal_reset_fields, 0,
 204                offsetof(CPUS390XState, end_reset_fields) -
 205                offsetof(CPUS390XState, start_normal_reset_fields));
 206
 207         env->pfault_token = -1UL;
 208         env->bpbc = false;
 209         break;
 210     default:
 211         g_assert_not_reached();
 212     }
 213
 214     /* Reset state inside the kernel that we cannot access yet from QEMU. */
 215     if (kvm_enabled()) {
 216         switch (type) {
 217         case S390_CPU_RESET_CLEAR:
 218             kvm_s390_reset_vcpu_clear(cpu);
 219             break;
 220         case S390_CPU_RESET_INITIAL:
 221             kvm_s390_reset_vcpu_initial(cpu);
 222             break;
 223         case S390_CPU_RESET_NORMAL:
 224             kvm_s390_reset_vcpu_normal(cpu);
 225             break;
 226         }
 227     }
 228 }
 229
 230 static void s390_cpu_disas_set_info(CPUState *cpu, disassemble_info *info)
 231 {
 232     info->mach = bfd_mach_s390_64;
 233     info->cap_arch = CS_ARCH_SYSZ;
 234     info->cap_insn_unit = 2;
 235     info->cap_insn_split = 6;
 236 }
 237
 238 static void s390_cpu_realizefn(DeviceState *dev, Error **errp)
 239 {
 240     CPUState *cs = CPU(dev);
 241     S390CPUClass *scc = S390_CPU_GET_CLASS(dev);
 242     Error *err = NULL;
 243
 244     /* the model has to be realized before qemu_init_vcpu() due to kvm */
 245     s390_realize_cpu_model(cs, &err);
 246     if (err) {
 247         goto out;
 248     }
 249
 250 #if !defined(CONFIG_USER_ONLY)
 251     if (!s390_cpu_realize_sysemu(dev, &err)) {
 252         goto out;
 253     }
 254 #endif
 255
 256     cpu_exec_realizefn(cs, &err);
 257     if (err != NULL) {
 258         goto out;
 259     }
 260
 261 #if !defined(CONFIG_USER_ONLY)
 262     qemu_register_reset(s390_cpu_machine_reset_cb, S390_CPU(dev));
 263 #endif
 264     s390_cpu_gdb_init(cs);
 265     qemu_init_vcpu(cs);
 266
 267     /*
 268      * KVM requires the initial CPU reset ioctl to be executed on the target
 269      * CPU thread. CPU hotplug under single-threaded TCG will not work with
 270      * run_on_cpu(), as run_on_cpu() will not work properly if called while
 271      * the main thread is already running but the CPU hasn't been realized.
 272      */
 273     if (kvm_enabled()) {
 274         run_on_cpu(cs, s390_do_cpu_full_reset, RUN_ON_CPU_NULL);
 275     } else {
 276         cpu_reset(cs);
 277     }
 278
 279     scc->parent_realize(dev, &err);
 280 out:
 281     error_propagate(errp, err);
 282 }
 283
 284 static void s390_cpu_initfn(Object *obj)
 285 {
 286     CPUState *cs = CPU(obj);
 287
 288     cs->exception_index = EXCP_HLT;
 289
 290 #if !defined(CONFIG_USER_ONLY)
 291     s390_cpu_init_sysemu(obj);
 292 #endif
 293 }
 294
 295 static const gchar *s390_gdb_arch_name(CPUState *cs)
 296 {
 297     return "s390:64-bit";
 298 }
 299
 300 static Property s390x_cpu_properties[] = {
 301 #if !defined(CONFIG_USER_ONLY)
 302     DEFINE_PROP_UINT32("core-id", S390CPU, env.core_id, 0),
 303     DEFINE_PROP_INT32("socket-id", S390CPU, env.socket_id, -1),
 304     DEFINE_PROP_INT32("book-id", S390CPU, env.book_id, -1),
 305     DEFINE_PROP_INT32("drawer-id", S390CPU, env.drawer_id, -1),
 306     DEFINE_PROP_BOOL("dedicated", S390CPU, env.dedicated, false),
 307     DEFINE_PROP_CPUS390ENTITLEMENT("entitlement", S390CPU, env.entitlement,
 308                                    S390_CPU_ENTITLEMENT_AUTO),
 309 #endif
 310     DEFINE_PROP_END_OF_LIST()
 311 };
 312
 313 static void s390_cpu_reset_full(DeviceState *dev)
 314 {
 315     CPUState *s = CPU(dev);
 316     return s390_cpu_reset(s, S390_CPU_RESET_CLEAR);
 317 }
 318
 319 #ifdef CONFIG_TCG
 320 #include "hw/core/tcg-cpu-ops.h"
 321
 322 static const TCGCPUOps s390_tcg_ops = {
 323     .initialize = s390x_translate_init,
 324     .restore_state_to_opc = s390x_restore_state_to_opc,
 325
 326 #ifdef CONFIG_USER_ONLY
 327     .record_sigsegv = s390_cpu_record_sigsegv,
 328     .record_sigbus = s390_cpu_record_sigbus,
 329 #else
 330     .tlb_fill = s390_cpu_tlb_fill,
 331     .cpu_exec_interrupt = s390_cpu_exec_interrupt,
 332     .do_interrupt = s390_cpu_do_interrupt,
 333     .debug_excp_handler = s390x_cpu_debug_excp_handler,
 334     .do_unaligned_access = s390x_cpu_do_unaligned_access,
 335 #endif /* !CONFIG_USER_ONLY */
 336 };
 337 #endif /* CONFIG_TCG */
 338
 339 static void s390_cpu_class_init(ObjectClass *oc, void *data)
 340 {
 341     S390CPUClass *scc = S390_CPU_CLASS(oc);
 342     CPUClass *cc = CPU_CLASS(scc);
 343     DeviceClass *dc = DEVICE_CLASS(oc);
 344
 345     device_class_set_parent_realize(dc, s390_cpu_realizefn,
 346                                     &scc->parent_realize);
 347     device_class_set_props(dc, s390x_cpu_properties);
 348     dc->user_creatable = true;
 349
 350     device_class_set_parent_reset(dc, s390_cpu_reset_full, &scc->parent_reset);
 351
 352     scc->reset = s390_cpu_reset;
 353     cc->class_by_name = s390_cpu_class_by_name,
 354     cc->has_work = s390_cpu_has_work;
 355     cc->dump_state = s390_cpu_dump_state;
 356     cc->query_cpu_fast = s390_query_cpu_fast;
 357     cc->set_pc = s390_cpu_set_pc;
 358     cc->get_pc = s390_cpu_get_pc;
 359     cc->gdb_read_register = s390_cpu_gdb_read_register;
 360     cc->gdb_write_register = s390_cpu_gdb_write_register;
 361 #ifndef CONFIG_USER_ONLY
 362     s390_cpu_class_init_sysemu(cc);
 363 #endif
 364     cc->disas_set_info = s390_cpu_disas_set_info;
 365     cc->gdb_num_core_regs = S390_NUM_CORE_REGS;
 366     cc->gdb_core_xml_file = "s390x-core64.xml";
 367     cc->gdb_arch_name = s390_gdb_arch_name;
 368
 369     s390_cpu_model_class_register_props(oc);
 370
 371 #ifdef CONFIG_TCG
 372     cc->tcg_ops = &s390_tcg_ops;
 373 #endif /* CONFIG_TCG */
 374 }
 375
 376 static const TypeInfo s390_cpu_type_info = {
 377     .name = TYPE_S390_CPU,
 378     .parent = TYPE_CPU,
 379     .instance_size = sizeof(S390CPU),
 380     .instance_align = __alignof__(S390CPU),
 381     .instance_init = s390_cpu_initfn,
 382
 383 #ifndef CONFIG_USER_ONLY
 384     .instance_finalize = s390_cpu_finalize,
 385 #endif /* !CONFIG_USER_ONLY */
 386
 387     .abstract = true,
 388     .class_size = sizeof(S390CPUClass),
 389     .class_init = s390_cpu_class_init,
 390 };
 391
 392 static void s390_cpu_register_types(void)
 393 {
 394     type_register_static(&s390_cpu_type_info);
 395 }
 396
 397 type_init(s390_cpu_register_types)