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 "sysemu/reset.h"
  30 #include "qemu/module.h"
  31 #include "trace.h"
  32 #include "qapi/qapi-types-machine.h"
  33 #include "sysemu/hw_accel.h"
  34 #include "hw/qdev-properties.h"
  35 #include "fpu/softfloat-helpers.h"
  36 #include "disas/capstone.h"
  37 #include "sysemu/tcg.h"
  38
  39 #define CR0_RESET       0xE0UL
  40 #define CR14_RESET      0xC2000000UL;
  41
  42 void s390_cpu_set_psw(CPUS390XState *env, uint64_t mask, uint64_t addr)
  43 {
  44 #ifndef CONFIG_USER_ONLY
  45     uint64_t old_mask = env->psw.mask;
  46 #endif
  47
  48     env->psw.addr = addr;
  49     env->psw.mask = mask;
  50
  51     /* KVM will handle all WAITs and trigger a WAIT exit on disabled_wait */
  52     if (!tcg_enabled()) {
  53         return;
  54     }
  55     env->cc_op = (mask >> 44) & 3;
  56
  57 #ifndef CONFIG_USER_ONLY
  58     if ((old_mask ^ mask) & PSW_MASK_PER) {
  59         s390_cpu_recompute_watchpoints(env_cpu(env));
  60     }
  61
  62     if (mask & PSW_MASK_WAIT) {
  63         s390_handle_wait(env_archcpu(env));
  64     }
  65 #endif
  66 }
  67
  68 uint64_t s390_cpu_get_psw_mask(CPUS390XState *env)
  69 {
  70     uint64_t r = env->psw.mask;
  71
  72     if (tcg_enabled()) {
  73         uint64_t cc = calc_cc(env, env->cc_op, env->cc_src,
  74                               env->cc_dst, env->cc_vr);
  75
  76         assert(cc <= 3);
  77         r &= ~PSW_MASK_CC;
  78         r |= cc << 44;
  79     }
  80
  81     return r;
  82 }
  83
  84 static void s390_cpu_set_pc(CPUState *cs, vaddr value)
  85 {
  86     S390CPU *cpu = S390_CPU(cs);
  87
  88     cpu->env.psw.addr = value;
  89 }
  90
  91 static bool s390_cpu_has_work(CPUState *cs)
  92 {
  93     S390CPU *cpu = S390_CPU(cs);
  94
  95     /* STOPPED cpus can never wake up */
  96     if (s390_cpu_get_state(cpu) != S390_CPU_STATE_LOAD &&
  97         s390_cpu_get_state(cpu) != S390_CPU_STATE_OPERATING) {
  98         return false;
  99     }
 100
 101     if (!(cs->interrupt_request & CPU_INTERRUPT_HARD)) {
 102         return false;
 103     }
 104
 105     return s390_cpu_has_int(cpu);
 106 }
 107
 108 /* S390CPUClass::reset() */
 109 static void s390_cpu_reset(CPUState *s, cpu_reset_type type)
 110 {
 111     S390CPU *cpu = S390_CPU(s);
 112     S390CPUClass *scc = S390_CPU_GET_CLASS(cpu);
 113     CPUS390XState *env = &cpu->env;
 114     DeviceState *dev = DEVICE(s);
 115
 116     scc->parent_reset(dev);
 117     cpu->env.sigp_order = 0;
 118     s390_cpu_set_state(S390_CPU_STATE_STOPPED, cpu);
 119
 120     switch (type) {
 121     case S390_CPU_RESET_CLEAR:
 122         memset(env, 0, offsetof(CPUS390XState, start_initial_reset_fields));
 123         /* fall through */
 124     case S390_CPU_RESET_INITIAL:
 125         /* initial reset does not clear everything! */
 126         memset(&env->start_initial_reset_fields, 0,
 127                offsetof(CPUS390XState, start_normal_reset_fields) -
 128                offsetof(CPUS390XState, start_initial_reset_fields));
 129
 130         /* architectured initial value for Breaking-Event-Address register */
 131         env->gbea = 1;
 132
 133         /* architectured initial values for CR 0 and 14 */
 134         env->cregs[0] = CR0_RESET;
 135         env->cregs[14] = CR14_RESET;
 136
 137 #if defined(CONFIG_USER_ONLY)
 138         /* user mode should always be allowed to use the full FPU */
 139         env->cregs[0] |= CR0_AFP;
 140         if (s390_has_feat(S390_FEAT_VECTOR)) {
 141             env->cregs[0] |= CR0_VECTOR;
 142         }
 143 #endif
 144
 145         /* tininess for underflow is detected before rounding */
 146         set_float_detect_tininess(float_tininess_before_rounding,
 147                                   &env->fpu_status);
 148        /* fall through */
 149     case S390_CPU_RESET_NORMAL:
 150         env->psw.mask &= ~PSW_MASK_RI;
 151         memset(&env->start_normal_reset_fields, 0,
 152                offsetof(CPUS390XState, end_reset_fields) -
 153                offsetof(CPUS390XState, start_normal_reset_fields));
 154
 155         env->pfault_token = -1UL;
 156         env->bpbc = false;
 157         break;
 158     default:
 159         g_assert_not_reached();
 160     }
 161
 162     /* Reset state inside the kernel that we cannot access yet from QEMU. */
 163     if (kvm_enabled()) {
 164         switch (type) {
 165         case S390_CPU_RESET_CLEAR:
 166             kvm_s390_reset_vcpu_clear(cpu);
 167             break;
 168         case S390_CPU_RESET_INITIAL:
 169             kvm_s390_reset_vcpu_initial(cpu);
 170             break;
 171         case S390_CPU_RESET_NORMAL:
 172             kvm_s390_reset_vcpu_normal(cpu);
 173             break;
 174         }
 175     }
 176 }
 177
 178 static void s390_cpu_disas_set_info(CPUState *cpu, disassemble_info *info)
 179 {
 180     info->mach = bfd_mach_s390_64;
 181     info->print_insn = print_insn_s390;
 182     info->cap_arch = CS_ARCH_SYSZ;
 183     info->cap_insn_unit = 2;
 184     info->cap_insn_split = 6;
 185 }
 186
 187 static void s390_cpu_realizefn(DeviceState *dev, Error **errp)
 188 {
 189     CPUState *cs = CPU(dev);
 190     S390CPUClass *scc = S390_CPU_GET_CLASS(dev);
 191     Error *err = NULL;
 192
 193     /* the model has to be realized before qemu_init_vcpu() due to kvm */
 194     s390_realize_cpu_model(cs, &err);
 195     if (err) {
 196         goto out;
 197     }
 198
 199 #if !defined(CONFIG_USER_ONLY)
 200     if (!s390_cpu_realize_sysemu(dev, &err)) {
 201         goto out;
 202     }
 203 #endif
 204
 205     cpu_exec_realizefn(cs, &err);
 206     if (err != NULL) {
 207         goto out;
 208     }
 209
 210 #if !defined(CONFIG_USER_ONLY)
 211     qemu_register_reset(s390_cpu_machine_reset_cb, S390_CPU(dev));
 212 #endif
 213     s390_cpu_gdb_init(cs);
 214     qemu_init_vcpu(cs);
 215
 216     /*
 217      * KVM requires the initial CPU reset ioctl to be executed on the target
 218      * CPU thread. CPU hotplug under single-threaded TCG will not work with
 219      * run_on_cpu(), as run_on_cpu() will not work properly if called while
 220      * the main thread is already running but the CPU hasn't been realized.
 221      */
 222     if (kvm_enabled()) {
 223         run_on_cpu(cs, s390_do_cpu_full_reset, RUN_ON_CPU_NULL);
 224     } else {
 225         cpu_reset(cs);
 226     }
 227
 228     scc->parent_realize(dev, &err);
 229 out:
 230     error_propagate(errp, err);
 231 }
 232
 233 static void s390_cpu_initfn(Object *obj)
 234 {
 235     CPUState *cs = CPU(obj);
 236     S390CPU *cpu = S390_CPU(obj);
 237
 238     cpu_set_cpustate_pointers(cpu);
 239     cs->exception_index = EXCP_HLT;
 240
 241 #if !defined(CONFIG_USER_ONLY)
 242     s390_cpu_init_sysemu(obj);
 243 #endif
 244 }
 245
 246 static gchar *s390_gdb_arch_name(CPUState *cs)
 247 {
 248     return g_strdup("s390:64-bit");
 249 }
 250
 251 static Property s390x_cpu_properties[] = {
 252 #if !defined(CONFIG_USER_ONLY)
 253     DEFINE_PROP_UINT32("core-id", S390CPU, env.core_id, 0),
 254 #endif
 255     DEFINE_PROP_END_OF_LIST()
 256 };
 257
 258 static void s390_cpu_reset_full(DeviceState *dev)
 259 {
 260     CPUState *s = CPU(dev);
 261     return s390_cpu_reset(s, S390_CPU_RESET_CLEAR);
 262 }
 263
 264 #ifdef CONFIG_TCG
 265 #include "hw/core/tcg-cpu-ops.h"
 266
 267 static const struct TCGCPUOps s390_tcg_ops = {
 268     .initialize = s390x_translate_init,
 269
 270 #ifdef CONFIG_USER_ONLY
 271     .record_sigsegv = s390_cpu_record_sigsegv,
 272     .record_sigbus = s390_cpu_record_sigbus,
 273 #else
 274     .tlb_fill = s390_cpu_tlb_fill,
 275     .cpu_exec_interrupt = s390_cpu_exec_interrupt,
 276     .do_interrupt = s390_cpu_do_interrupt,
 277     .debug_excp_handler = s390x_cpu_debug_excp_handler,
 278     .do_unaligned_access = s390x_cpu_do_unaligned_access,
 279 #endif /* !CONFIG_USER_ONLY */
 280 };
 281 #endif /* CONFIG_TCG */
 282
 283 static void s390_cpu_class_init(ObjectClass *oc, void *data)
 284 {
 285     S390CPUClass *scc = S390_CPU_CLASS(oc);
 286     CPUClass *cc = CPU_CLASS(scc);
 287     DeviceClass *dc = DEVICE_CLASS(oc);
 288
 289     device_class_set_parent_realize(dc, s390_cpu_realizefn,
 290                                     &scc->parent_realize);
 291     device_class_set_props(dc, s390x_cpu_properties);
 292     dc->user_creatable = true;
 293
 294     device_class_set_parent_reset(dc, s390_cpu_reset_full, &scc->parent_reset);
 295
 296     scc->reset = s390_cpu_reset;
 297     cc->class_by_name = s390_cpu_class_by_name,
 298     cc->has_work = s390_cpu_has_work;
 299     cc->dump_state = s390_cpu_dump_state;
 300     cc->set_pc = s390_cpu_set_pc;
 301     cc->gdb_read_register = s390_cpu_gdb_read_register;
 302     cc->gdb_write_register = s390_cpu_gdb_write_register;
 303 #ifndef CONFIG_USER_ONLY
 304     s390_cpu_class_init_sysemu(cc);
 305 #endif
 306     cc->disas_set_info = s390_cpu_disas_set_info;
 307     cc->gdb_num_core_regs = S390_NUM_CORE_REGS;
 308     cc->gdb_core_xml_file = "s390x-core64.xml";
 309     cc->gdb_arch_name = s390_gdb_arch_name;
 310
 311     s390_cpu_model_class_register_props(oc);
 312
 313 #ifdef CONFIG_TCG
 314     cc->tcg_ops = &s390_tcg_ops;
 315 #endif /* CONFIG_TCG */
 316 }
 317
 318 static const TypeInfo s390_cpu_type_info = {
 319     .name = TYPE_S390_CPU,
 320     .parent = TYPE_CPU,
 321     .instance_size = sizeof(S390CPU),
 322     .instance_align = __alignof__(S390CPU),
 323     .instance_init = s390_cpu_initfn,
 324
 325 #ifndef CONFIG_USER_ONLY
 326     .instance_finalize = s390_cpu_finalize,
 327 #endif /* !CONFIG_USER_ONLY */
 328
 329     .abstract = true,
 330     .class_size = sizeof(S390CPUClass),
 331     .class_init = s390_cpu_class_init,
 332 };
 333
 334 static void s390_cpu_register_types(void)
 335 {
 336     type_register_static(&s390_cpu_type_info);
 337 }
 338
 339 type_init(s390_cpu_register_types)