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