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