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