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 /* S390CPUClass::reset() */
 144 static void s390_cpu_reset(CPUState *s, cpu_reset_type type)
 145 {
 146     S390CPU *cpu = S390_CPU(s);
 147     S390CPUClass *scc = S390_CPU_GET_CLASS(cpu);
 148     CPUS390XState *env = &cpu->env;
 149     DeviceState *dev = DEVICE(s);
 150
 151     scc->parent_reset(dev);
 152     cpu->env.sigp_order = 0;
 153     s390_cpu_set_state(S390_CPU_STATE_STOPPED, cpu);
 154
 155     switch (type) {
 156     case S390_CPU_RESET_CLEAR:
 157         memset(env, 0, offsetof(CPUS390XState, start_initial_reset_fields));
 158         /* fall through */
 159     case S390_CPU_RESET_INITIAL:
 160         /* initial reset does not clear everything! */
 161         memset(&env->start_initial_reset_fields, 0,
 162                offsetof(CPUS390XState, start_normal_reset_fields) -
 163                offsetof(CPUS390XState, start_initial_reset_fields));
 164
 165         /* architectured initial value for Breaking-Event-Address register */
 166         env->gbea = 1;
 167
 168         /* architectured initial values for CR 0 and 14 */
 169         env->cregs[0] = CR0_RESET;
 170         env->cregs[14] = CR14_RESET;
 171
 172 #if defined(CONFIG_USER_ONLY)
 173         /* user mode should always be allowed to use the full FPU */
 174         env->cregs[0] |= CR0_AFP;
 175         if (s390_has_feat(S390_FEAT_VECTOR)) {
 176             env->cregs[0] |= CR0_VECTOR;
 177         }
 178 #endif
 179
 180         /* tininess for underflow is detected before rounding */
 181         set_float_detect_tininess(float_tininess_before_rounding,
 182                                   &env->fpu_status);
 183        /* fall through */
 184     case S390_CPU_RESET_NORMAL:
 185         env->psw.mask &= ~PSW_MASK_RI;
 186         memset(&env->start_normal_reset_fields, 0,
 187                offsetof(CPUS390XState, end_reset_fields) -
 188                offsetof(CPUS390XState, start_normal_reset_fields));
 189
 190         env->pfault_token = -1UL;
 191         env->bpbc = false;
 192         break;
 193     default:
 194         g_assert_not_reached();
 195     }
 196
 197     /* Reset state inside the kernel that we cannot access yet from QEMU. */
 198     if (kvm_enabled()) {
 199         switch (type) {
 200         case S390_CPU_RESET_CLEAR:
 201             kvm_s390_reset_vcpu_clear(cpu);
 202             break;
 203         case S390_CPU_RESET_INITIAL:
 204             kvm_s390_reset_vcpu_initial(cpu);
 205             break;
 206         case S390_CPU_RESET_NORMAL:
 207             kvm_s390_reset_vcpu_normal(cpu);
 208             break;
 209         }
 210     }
 211 }
 212
 213 static void s390_cpu_disas_set_info(CPUState *cpu, disassemble_info *info)
 214 {
 215     info->mach = bfd_mach_s390_64;
 216     info->cap_arch = CS_ARCH_SYSZ;
 217     info->cap_insn_unit = 2;
 218     info->cap_insn_split = 6;
 219 }
 220
 221 static void s390_cpu_realizefn(DeviceState *dev, Error **errp)
 222 {
 223     CPUState *cs = CPU(dev);
 224     S390CPUClass *scc = S390_CPU_GET_CLASS(dev);
 225     Error *err = NULL;
 226
 227     /* the model has to be realized before qemu_init_vcpu() due to kvm */
 228     s390_realize_cpu_model(cs, &err);
 229     if (err) {
 230         goto out;
 231     }
 232
 233 #if !defined(CONFIG_USER_ONLY)
 234     if (!s390_cpu_realize_sysemu(dev, &err)) {
 235         goto out;
 236     }
 237 #endif
 238
 239     cpu_exec_realizefn(cs, &err);
 240     if (err != NULL) {
 241         goto out;
 242     }
 243
 244 #if !defined(CONFIG_USER_ONLY)
 245     qemu_register_reset(s390_cpu_machine_reset_cb, S390_CPU(dev));
 246 #endif
 247     s390_cpu_gdb_init(cs);
 248     qemu_init_vcpu(cs);
 249
 250     /*
 251      * KVM requires the initial CPU reset ioctl to be executed on the target
 252      * CPU thread. CPU hotplug under single-threaded TCG will not work with
 253      * run_on_cpu(), as run_on_cpu() will not work properly if called while
 254      * the main thread is already running but the CPU hasn't been realized.
 255      */
 256     if (kvm_enabled()) {
 257         run_on_cpu(cs, s390_do_cpu_full_reset, RUN_ON_CPU_NULL);
 258     } else {
 259         cpu_reset(cs);
 260     }
 261
 262     scc->parent_realize(dev, &err);
 263 out:
 264     error_propagate(errp, err);
 265 }
 266
 267 static void s390_cpu_initfn(Object *obj)
 268 {
 269     CPUState *cs = CPU(obj);
 270     S390CPU *cpu = S390_CPU(obj);
 271
 272     cpu_set_cpustate_pointers(cpu);
 273     cs->exception_index = EXCP_HLT;
 274
 275 #if !defined(CONFIG_USER_ONLY)
 276     s390_cpu_init_sysemu(obj);
 277 #endif
 278 }
 279
 280 static gchar *s390_gdb_arch_name(CPUState *cs)
 281 {
 282     return g_strdup("s390:64-bit");
 283 }
 284
 285 static Property s390x_cpu_properties[] = {
 286 #if !defined(CONFIG_USER_ONLY)
 287     DEFINE_PROP_UINT32("core-id", S390CPU, env.core_id, 0),
 288 #endif
 289     DEFINE_PROP_END_OF_LIST()
 290 };
 291
 292 static void s390_cpu_reset_full(DeviceState *dev)
 293 {
 294     CPUState *s = CPU(dev);
 295     return s390_cpu_reset(s, S390_CPU_RESET_CLEAR);
 296 }
 297
 298 #ifdef CONFIG_TCG
 299 #include "hw/core/tcg-cpu-ops.h"
 300
 301 static const struct TCGCPUOps s390_tcg_ops = {
 302     .initialize = s390x_translate_init,
 303     .restore_state_to_opc = s390x_restore_state_to_opc,
 304
 305 #ifdef CONFIG_USER_ONLY
 306     .record_sigsegv = s390_cpu_record_sigsegv,
 307     .record_sigbus = s390_cpu_record_sigbus,
 308 #else
 309     .tlb_fill = s390_cpu_tlb_fill,
 310     .cpu_exec_interrupt = s390_cpu_exec_interrupt,
 311     .do_interrupt = s390_cpu_do_interrupt,
 312     .debug_excp_handler = s390x_cpu_debug_excp_handler,
 313     .do_unaligned_access = s390x_cpu_do_unaligned_access,
 314 #endif /* !CONFIG_USER_ONLY */
 315 };
 316 #endif /* CONFIG_TCG */
 317
 318 static void s390_cpu_class_init(ObjectClass *oc, void *data)
 319 {
 320     S390CPUClass *scc = S390_CPU_CLASS(oc);
 321     CPUClass *cc = CPU_CLASS(scc);
 322     DeviceClass *dc = DEVICE_CLASS(oc);
 323
 324     device_class_set_parent_realize(dc, s390_cpu_realizefn,
 325                                     &scc->parent_realize);
 326     device_class_set_props(dc, s390x_cpu_properties);
 327     dc->user_creatable = true;
 328
 329     device_class_set_parent_reset(dc, s390_cpu_reset_full, &scc->parent_reset);
 330
 331     scc->reset = s390_cpu_reset;
 332     cc->class_by_name = s390_cpu_class_by_name,
 333     cc->has_work = s390_cpu_has_work;
 334     cc->dump_state = s390_cpu_dump_state;
 335     cc->set_pc = s390_cpu_set_pc;
 336     cc->get_pc = s390_cpu_get_pc;
 337     cc->gdb_read_register = s390_cpu_gdb_read_register;
 338     cc->gdb_write_register = s390_cpu_gdb_write_register;
 339 #ifndef CONFIG_USER_ONLY
 340     s390_cpu_class_init_sysemu(cc);
 341 #endif
 342     cc->disas_set_info = s390_cpu_disas_set_info;
 343     cc->gdb_num_core_regs = S390_NUM_CORE_REGS;
 344     cc->gdb_core_xml_file = "s390x-core64.xml";
 345     cc->gdb_arch_name = s390_gdb_arch_name;
 346
 347     s390_cpu_model_class_register_props(oc);
 348
 349 #ifdef CONFIG_TCG
 350     cc->tcg_ops = &s390_tcg_ops;
 351 #endif /* CONFIG_TCG */
 352 }
 353
 354 static const TypeInfo s390_cpu_type_info = {
 355     .name = TYPE_S390_CPU,
 356     .parent = TYPE_CPU,
 357     .instance_size = sizeof(S390CPU),
 358     .instance_align = __alignof__(S390CPU),
 359     .instance_init = s390_cpu_initfn,
 360
 361 #ifndef CONFIG_USER_ONLY
 362     .instance_finalize = s390_cpu_finalize,
 363 #endif /* !CONFIG_USER_ONLY */
 364
 365     .abstract = true,
 366     .class_size = sizeof(S390CPUClass),
 367     .class_init = s390_cpu_class_init,
 368 };
 369
 370 static void s390_cpu_register_types(void)
 371 {
 372     type_register_static(&s390_cpu_type_info);
 373 }
 374
 375 type_init(s390_cpu_register_types)