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 "hw/qdev-properties-system.h" 35 #include "fpu/softfloat-helpers.h" 36 #include "disas/capstone.h" 37 #include "sysemu/tcg.h" 38 #ifndef CONFIG_USER_ONLY 39 #include "sysemu/reset.h" 40 #endif 41 #include "hw/s390x/cpu-topology.h" 42 43 #define CR0_RESET 0xE0UL 44 #define CR14_RESET 0xC2000000UL; 45 46 #ifndef CONFIG_USER_ONLY 47 static bool is_early_exception_psw(uint64_t mask, uint64_t addr) 48 { 49 if (mask & PSW_MASK_RESERVED) { 50 return true; 51 } 52 53 switch (mask & (PSW_MASK_32 | PSW_MASK_64)) { 54 case 0: 55 return addr & ~0xffffffULL; 56 case PSW_MASK_32: 57 return addr & ~0x7fffffffULL; 58 case PSW_MASK_32 | PSW_MASK_64: 59 return false; 60 default: /* PSW_MASK_64 */ 61 return true; 62 } 63 } 64 #endif 65 66 void s390_cpu_set_psw(CPUS390XState *env, uint64_t mask, uint64_t addr) 67 { 68 #ifndef CONFIG_USER_ONLY 69 uint64_t old_mask = env->psw.mask; 70 #endif 71 72 env->psw.addr = addr; 73 env->psw.mask = mask; 74 75 /* KVM will handle all WAITs and trigger a WAIT exit on disabled_wait */ 76 if (!tcg_enabled()) { 77 return; 78 } 79 env->cc_op = (mask >> 44) & 3; 80 81 #ifndef CONFIG_USER_ONLY 82 if (is_early_exception_psw(mask, addr)) { 83 env->int_pgm_ilen = 0; 84 trigger_pgm_exception(env, PGM_SPECIFICATION); 85 return; 86 } 87 88 if ((old_mask ^ mask) & PSW_MASK_PER) { 89 s390_cpu_recompute_watchpoints(env_cpu(env)); 90 } 91 92 if (mask & PSW_MASK_WAIT) { 93 s390_handle_wait(env_archcpu(env)); 94 } 95 #endif 96 } 97 98 uint64_t s390_cpu_get_psw_mask(CPUS390XState *env) 99 { 100 uint64_t r = env->psw.mask; 101 102 if (tcg_enabled()) { 103 uint64_t cc = calc_cc(env, env->cc_op, env->cc_src, 104 env->cc_dst, env->cc_vr); 105 106 assert(cc <= 3); 107 r &= ~PSW_MASK_CC; 108 r |= cc << 44; 109 } 110 111 return r; 112 } 113 114 static void s390_cpu_set_pc(CPUState *cs, vaddr value) 115 { 116 S390CPU *cpu = S390_CPU(cs); 117 118 cpu->env.psw.addr = value; 119 } 120 121 static vaddr s390_cpu_get_pc(CPUState *cs) 122 { 123 S390CPU *cpu = S390_CPU(cs); 124 125 return cpu->env.psw.addr; 126 } 127 128 static bool s390_cpu_has_work(CPUState *cs) 129 { 130 S390CPU *cpu = S390_CPU(cs); 131 132 /* STOPPED cpus can never wake up */ 133 if (s390_cpu_get_state(cpu) != S390_CPU_STATE_LOAD && 134 s390_cpu_get_state(cpu) != S390_CPU_STATE_OPERATING) { 135 return false; 136 } 137 138 if (!(cs->interrupt_request & CPU_INTERRUPT_HARD)) { 139 return false; 140 } 141 142 return s390_cpu_has_int(cpu); 143 } 144 145 static int s390x_cpu_mmu_index(CPUState *cs, bool ifetch) 146 { 147 return s390x_env_mmu_index(cpu_env(cs), ifetch); 148 } 149 150 static void s390_query_cpu_fast(CPUState *cpu, CpuInfoFast *value) 151 { 152 S390CPU *s390_cpu = S390_CPU(cpu); 153 154 value->u.s390x.cpu_state = s390_cpu->env.cpu_state; 155 #if !defined(CONFIG_USER_ONLY) 156 if (s390_has_topology()) { 157 value->u.s390x.has_dedicated = true; 158 value->u.s390x.dedicated = s390_cpu->env.dedicated; 159 value->u.s390x.has_entitlement = true; 160 value->u.s390x.entitlement = s390_cpu->env.entitlement; 161 } 162 #endif 163 } 164 165 /* S390CPUClass::reset() */ 166 static void s390_cpu_reset(CPUState *s, cpu_reset_type type) 167 { 168 S390CPU *cpu = S390_CPU(s); 169 S390CPUClass *scc = S390_CPU_GET_CLASS(cpu); 170 CPUS390XState *env = &cpu->env; 171 DeviceState *dev = DEVICE(s); 172 173 scc->parent_reset(dev); 174 cpu->env.sigp_order = 0; 175 s390_cpu_set_state(S390_CPU_STATE_STOPPED, cpu); 176 177 switch (type) { 178 case S390_CPU_RESET_CLEAR: 179 memset(env, 0, offsetof(CPUS390XState, start_initial_reset_fields)); 180 /* fall through */ 181 case S390_CPU_RESET_INITIAL: 182 /* initial reset does not clear everything! */ 183 memset(&env->start_initial_reset_fields, 0, 184 offsetof(CPUS390XState, start_normal_reset_fields) - 185 offsetof(CPUS390XState, start_initial_reset_fields)); 186 187 /* architectured initial value for Breaking-Event-Address register */ 188 env->gbea = 1; 189 190 /* architectured initial values for CR 0 and 14 */ 191 env->cregs[0] = CR0_RESET; 192 env->cregs[14] = CR14_RESET; 193 194 #if defined(CONFIG_USER_ONLY) 195 /* user mode should always be allowed to use the full FPU */ 196 env->cregs[0] |= CR0_AFP; 197 if (s390_has_feat(S390_FEAT_VECTOR)) { 198 env->cregs[0] |= CR0_VECTOR; 199 } 200 #endif 201 202 /* tininess for underflow is detected before rounding */ 203 set_float_detect_tininess(float_tininess_before_rounding, 204 &env->fpu_status); 205 /* fall through */ 206 case S390_CPU_RESET_NORMAL: 207 env->psw.mask &= ~PSW_MASK_RI; 208 memset(&env->start_normal_reset_fields, 0, 209 offsetof(CPUS390XState, end_reset_fields) - 210 offsetof(CPUS390XState, start_normal_reset_fields)); 211 212 env->pfault_token = -1UL; 213 env->bpbc = false; 214 break; 215 default: 216 g_assert_not_reached(); 217 } 218 219 /* Reset state inside the kernel that we cannot access yet from QEMU. */ 220 if (kvm_enabled()) { 221 switch (type) { 222 case S390_CPU_RESET_CLEAR: 223 kvm_s390_reset_vcpu_clear(cpu); 224 break; 225 case S390_CPU_RESET_INITIAL: 226 kvm_s390_reset_vcpu_initial(cpu); 227 break; 228 case S390_CPU_RESET_NORMAL: 229 kvm_s390_reset_vcpu_normal(cpu); 230 break; 231 } 232 } 233 } 234 235 static void s390_cpu_disas_set_info(CPUState *cpu, disassemble_info *info) 236 { 237 info->mach = bfd_mach_s390_64; 238 info->cap_arch = CS_ARCH_SYSZ; 239 info->cap_insn_unit = 2; 240 info->cap_insn_split = 6; 241 } 242 243 static void s390_cpu_realizefn(DeviceState *dev, Error **errp) 244 { 245 CPUState *cs = CPU(dev); 246 S390CPUClass *scc = S390_CPU_GET_CLASS(dev); 247 Error *err = NULL; 248 249 /* the model has to be realized before qemu_init_vcpu() due to kvm */ 250 s390_realize_cpu_model(cs, &err); 251 if (err) { 252 goto out; 253 } 254 255 #if !defined(CONFIG_USER_ONLY) 256 if (!s390_cpu_realize_sysemu(dev, &err)) { 257 goto out; 258 } 259 #endif 260 261 cpu_exec_realizefn(cs, &err); 262 if (err != NULL) { 263 goto out; 264 } 265 266 #if !defined(CONFIG_USER_ONLY) 267 qemu_register_reset(s390_cpu_machine_reset_cb, S390_CPU(dev)); 268 #endif 269 s390_cpu_gdb_init(cs); 270 qemu_init_vcpu(cs); 271 272 /* 273 * KVM requires the initial CPU reset ioctl to be executed on the target 274 * CPU thread. CPU hotplug under single-threaded TCG will not work with 275 * run_on_cpu(), as run_on_cpu() will not work properly if called while 276 * the main thread is already running but the CPU hasn't been realized. 277 */ 278 if (kvm_enabled()) { 279 run_on_cpu(cs, s390_do_cpu_full_reset, RUN_ON_CPU_NULL); 280 } else { 281 cpu_reset(cs); 282 } 283 284 scc->parent_realize(dev, &err); 285 out: 286 error_propagate(errp, err); 287 } 288 289 static void s390_cpu_initfn(Object *obj) 290 { 291 CPUState *cs = CPU(obj); 292 293 cs->exception_index = EXCP_HLT; 294 295 #if !defined(CONFIG_USER_ONLY) 296 s390_cpu_init_sysemu(obj); 297 #endif 298 } 299 300 static const gchar *s390_gdb_arch_name(CPUState *cs) 301 { 302 return "s390:64-bit"; 303 } 304 305 static Property s390x_cpu_properties[] = { 306 #if !defined(CONFIG_USER_ONLY) 307 DEFINE_PROP_UINT32("core-id", S390CPU, env.core_id, 0), 308 DEFINE_PROP_INT32("socket-id", S390CPU, env.socket_id, -1), 309 DEFINE_PROP_INT32("book-id", S390CPU, env.book_id, -1), 310 DEFINE_PROP_INT32("drawer-id", S390CPU, env.drawer_id, -1), 311 DEFINE_PROP_BOOL("dedicated", S390CPU, env.dedicated, false), 312 DEFINE_PROP_CPUS390ENTITLEMENT("entitlement", S390CPU, env.entitlement, 313 S390_CPU_ENTITLEMENT_AUTO), 314 #endif 315 DEFINE_PROP_END_OF_LIST() 316 }; 317 318 static void s390_cpu_reset_full(DeviceState *dev) 319 { 320 CPUState *s = CPU(dev); 321 return s390_cpu_reset(s, S390_CPU_RESET_CLEAR); 322 } 323 324 #ifdef CONFIG_TCG 325 #include "hw/core/tcg-cpu-ops.h" 326 327 void cpu_get_tb_cpu_state(CPUS390XState *env, vaddr *pc, 328 uint64_t *cs_base, uint32_t *pflags) 329 { 330 uint32_t flags; 331 332 if (env->psw.addr & 1) { 333 /* 334 * Instructions must be at even addresses. 335 * This needs to be checked before address translation. 336 */ 337 env->int_pgm_ilen = 2; /* see s390_cpu_tlb_fill() */ 338 tcg_s390_program_interrupt(env, PGM_SPECIFICATION, 0); 339 } 340 341 *pc = env->psw.addr; 342 *cs_base = env->ex_value; 343 344 flags = (env->psw.mask >> FLAG_MASK_PSW_SHIFT) & FLAG_MASK_PSW; 345 if (env->psw.mask & PSW_MASK_PER) { 346 flags |= env->cregs[9] & (FLAG_MASK_PER_BRANCH | 347 FLAG_MASK_PER_IFETCH | 348 FLAG_MASK_PER_IFETCH_NULLIFY); 349 if ((env->cregs[9] & PER_CR9_EVENT_STORE) && 350 (env->cregs[9] & PER_CR9_EVENT_STORE_REAL)) { 351 flags |= FLAG_MASK_PER_STORE_REAL; 352 } 353 } 354 if (env->cregs[0] & CR0_AFP) { 355 flags |= FLAG_MASK_AFP; 356 } 357 if (env->cregs[0] & CR0_VECTOR) { 358 flags |= FLAG_MASK_VECTOR; 359 } 360 *pflags = flags; 361 } 362 363 static const TCGCPUOps s390_tcg_ops = { 364 .initialize = s390x_translate_init, 365 .restore_state_to_opc = s390x_restore_state_to_opc, 366 367 #ifdef CONFIG_USER_ONLY 368 .record_sigsegv = s390_cpu_record_sigsegv, 369 .record_sigbus = s390_cpu_record_sigbus, 370 #else 371 .tlb_fill = s390_cpu_tlb_fill, 372 .cpu_exec_interrupt = s390_cpu_exec_interrupt, 373 .cpu_exec_halt = s390_cpu_has_work, 374 .do_interrupt = s390_cpu_do_interrupt, 375 .debug_excp_handler = s390x_cpu_debug_excp_handler, 376 .do_unaligned_access = s390x_cpu_do_unaligned_access, 377 #endif /* !CONFIG_USER_ONLY */ 378 }; 379 #endif /* CONFIG_TCG */ 380 381 static void s390_cpu_class_init(ObjectClass *oc, void *data) 382 { 383 S390CPUClass *scc = S390_CPU_CLASS(oc); 384 CPUClass *cc = CPU_CLASS(scc); 385 DeviceClass *dc = DEVICE_CLASS(oc); 386 387 device_class_set_parent_realize(dc, s390_cpu_realizefn, 388 &scc->parent_realize); 389 device_class_set_props(dc, s390x_cpu_properties); 390 dc->user_creatable = true; 391 392 device_class_set_parent_reset(dc, s390_cpu_reset_full, &scc->parent_reset); 393 394 scc->reset = s390_cpu_reset; 395 cc->class_by_name = s390_cpu_class_by_name, 396 cc->has_work = s390_cpu_has_work; 397 cc->mmu_index = s390x_cpu_mmu_index; 398 cc->dump_state = s390_cpu_dump_state; 399 cc->query_cpu_fast = s390_query_cpu_fast; 400 cc->set_pc = s390_cpu_set_pc; 401 cc->get_pc = s390_cpu_get_pc; 402 cc->gdb_read_register = s390_cpu_gdb_read_register; 403 cc->gdb_write_register = s390_cpu_gdb_write_register; 404 #ifndef CONFIG_USER_ONLY 405 s390_cpu_class_init_sysemu(cc); 406 #endif 407 cc->disas_set_info = s390_cpu_disas_set_info; 408 cc->gdb_core_xml_file = "s390x-core64.xml"; 409 cc->gdb_arch_name = s390_gdb_arch_name; 410 411 s390_cpu_model_class_register_props(oc); 412 413 #ifdef CONFIG_TCG 414 cc->tcg_ops = &s390_tcg_ops; 415 #endif /* CONFIG_TCG */ 416 } 417 418 static const TypeInfo s390_cpu_type_info = { 419 .name = TYPE_S390_CPU, 420 .parent = TYPE_CPU, 421 .instance_size = sizeof(S390CPU), 422 .instance_align = __alignof__(S390CPU), 423 .instance_init = s390_cpu_initfn, 424 425 #ifndef CONFIG_USER_ONLY 426 .instance_finalize = s390_cpu_finalize, 427 #endif /* !CONFIG_USER_ONLY */ 428 429 .abstract = true, 430 .class_size = sizeof(S390CPUClass), 431 .class_init = s390_cpu_class_init, 432 }; 433 434 static void s390_cpu_register_types(void) 435 { 436 type_register_static(&s390_cpu_type_info); 437 } 438 439 type_init(s390_cpu_register_types) 440