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 42 #define CR0_RESET 0xE0UL 43 #define CR14_RESET 0xC2000000UL; 44 45 #ifndef CONFIG_USER_ONLY 46 static bool is_early_exception_psw(uint64_t mask, uint64_t addr) 47 { 48 if (mask & PSW_MASK_RESERVED) { 49 return true; 50 } 51 52 switch (mask & (PSW_MASK_32 | PSW_MASK_64)) { 53 case 0: 54 return addr & ~0xffffffULL; 55 case PSW_MASK_32: 56 return addr & ~0x7fffffffULL; 57 case PSW_MASK_32 | PSW_MASK_64: 58 return false; 59 default: /* PSW_MASK_64 */ 60 return true; 61 } 62 } 63 #endif 64 65 void s390_cpu_set_psw(CPUS390XState *env, uint64_t mask, uint64_t addr) 66 { 67 #ifndef CONFIG_USER_ONLY 68 uint64_t old_mask = env->psw.mask; 69 #endif 70 71 env->psw.addr = addr; 72 env->psw.mask = mask; 73 74 /* KVM will handle all WAITs and trigger a WAIT exit on disabled_wait */ 75 if (!tcg_enabled()) { 76 return; 77 } 78 env->cc_op = (mask >> 44) & 3; 79 80 #ifndef CONFIG_USER_ONLY 81 if (is_early_exception_psw(mask, addr)) { 82 env->int_pgm_ilen = 0; 83 trigger_pgm_exception(env, PGM_SPECIFICATION); 84 return; 85 } 86 87 if ((old_mask ^ mask) & PSW_MASK_PER) { 88 s390_cpu_recompute_watchpoints(env_cpu(env)); 89 } 90 91 if (mask & PSW_MASK_WAIT) { 92 s390_handle_wait(env_archcpu(env)); 93 } 94 #endif 95 } 96 97 uint64_t s390_cpu_get_psw_mask(CPUS390XState *env) 98 { 99 uint64_t r = env->psw.mask; 100 101 if (tcg_enabled()) { 102 uint64_t cc = calc_cc(env, env->cc_op, env->cc_src, 103 env->cc_dst, env->cc_vr); 104 105 assert(cc <= 3); 106 r &= ~PSW_MASK_CC; 107 r |= cc << 44; 108 } 109 110 return r; 111 } 112 113 static void s390_cpu_set_pc(CPUState *cs, vaddr value) 114 { 115 S390CPU *cpu = S390_CPU(cs); 116 117 cpu->env.psw.addr = value; 118 } 119 120 static vaddr s390_cpu_get_pc(CPUState *cs) 121 { 122 S390CPU *cpu = S390_CPU(cs); 123 124 return cpu->env.psw.addr; 125 } 126 127 static bool s390_cpu_has_work(CPUState *cs) 128 { 129 S390CPU *cpu = S390_CPU(cs); 130 131 /* STOPPED cpus can never wake up */ 132 if (s390_cpu_get_state(cpu) != S390_CPU_STATE_LOAD && 133 s390_cpu_get_state(cpu) != S390_CPU_STATE_OPERATING) { 134 return false; 135 } 136 137 if (!(cs->interrupt_request & CPU_INTERRUPT_HARD)) { 138 return false; 139 } 140 141 return s390_cpu_has_int(cpu); 142 } 143 144 static void s390_query_cpu_fast(CPUState *cpu, CpuInfoFast *value) 145 { 146 S390CPU *s390_cpu = S390_CPU(cpu); 147 148 value->u.s390x.cpu_state = s390_cpu->env.cpu_state; 149 } 150 151 /* S390CPUClass::reset() */ 152 static void s390_cpu_reset(CPUState *s, cpu_reset_type type) 153 { 154 S390CPU *cpu = S390_CPU(s); 155 S390CPUClass *scc = S390_CPU_GET_CLASS(cpu); 156 CPUS390XState *env = &cpu->env; 157 DeviceState *dev = DEVICE(s); 158 159 scc->parent_reset(dev); 160 cpu->env.sigp_order = 0; 161 s390_cpu_set_state(S390_CPU_STATE_STOPPED, cpu); 162 163 switch (type) { 164 case S390_CPU_RESET_CLEAR: 165 memset(env, 0, offsetof(CPUS390XState, start_initial_reset_fields)); 166 /* fall through */ 167 case S390_CPU_RESET_INITIAL: 168 /* initial reset does not clear everything! */ 169 memset(&env->start_initial_reset_fields, 0, 170 offsetof(CPUS390XState, start_normal_reset_fields) - 171 offsetof(CPUS390XState, start_initial_reset_fields)); 172 173 /* architectured initial value for Breaking-Event-Address register */ 174 env->gbea = 1; 175 176 /* architectured initial values for CR 0 and 14 */ 177 env->cregs[0] = CR0_RESET; 178 env->cregs[14] = CR14_RESET; 179 180 #if defined(CONFIG_USER_ONLY) 181 /* user mode should always be allowed to use the full FPU */ 182 env->cregs[0] |= CR0_AFP; 183 if (s390_has_feat(S390_FEAT_VECTOR)) { 184 env->cregs[0] |= CR0_VECTOR; 185 } 186 #endif 187 188 /* tininess for underflow is detected before rounding */ 189 set_float_detect_tininess(float_tininess_before_rounding, 190 &env->fpu_status); 191 /* fall through */ 192 case S390_CPU_RESET_NORMAL: 193 env->psw.mask &= ~PSW_MASK_RI; 194 memset(&env->start_normal_reset_fields, 0, 195 offsetof(CPUS390XState, end_reset_fields) - 196 offsetof(CPUS390XState, start_normal_reset_fields)); 197 198 env->pfault_token = -1UL; 199 env->bpbc = false; 200 break; 201 default: 202 g_assert_not_reached(); 203 } 204 205 /* Reset state inside the kernel that we cannot access yet from QEMU. */ 206 if (kvm_enabled()) { 207 switch (type) { 208 case S390_CPU_RESET_CLEAR: 209 kvm_s390_reset_vcpu_clear(cpu); 210 break; 211 case S390_CPU_RESET_INITIAL: 212 kvm_s390_reset_vcpu_initial(cpu); 213 break; 214 case S390_CPU_RESET_NORMAL: 215 kvm_s390_reset_vcpu_normal(cpu); 216 break; 217 } 218 } 219 } 220 221 static void s390_cpu_disas_set_info(CPUState *cpu, disassemble_info *info) 222 { 223 info->mach = bfd_mach_s390_64; 224 info->cap_arch = CS_ARCH_SYSZ; 225 info->cap_insn_unit = 2; 226 info->cap_insn_split = 6; 227 } 228 229 static void s390_cpu_realizefn(DeviceState *dev, Error **errp) 230 { 231 CPUState *cs = CPU(dev); 232 S390CPUClass *scc = S390_CPU_GET_CLASS(dev); 233 Error *err = NULL; 234 235 /* the model has to be realized before qemu_init_vcpu() due to kvm */ 236 s390_realize_cpu_model(cs, &err); 237 if (err) { 238 goto out; 239 } 240 241 #if !defined(CONFIG_USER_ONLY) 242 if (!s390_cpu_realize_sysemu(dev, &err)) { 243 goto out; 244 } 245 #endif 246 247 cpu_exec_realizefn(cs, &err); 248 if (err != NULL) { 249 goto out; 250 } 251 252 #if !defined(CONFIG_USER_ONLY) 253 qemu_register_reset(s390_cpu_machine_reset_cb, S390_CPU(dev)); 254 #endif 255 s390_cpu_gdb_init(cs); 256 qemu_init_vcpu(cs); 257 258 /* 259 * KVM requires the initial CPU reset ioctl to be executed on the target 260 * CPU thread. CPU hotplug under single-threaded TCG will not work with 261 * run_on_cpu(), as run_on_cpu() will not work properly if called while 262 * the main thread is already running but the CPU hasn't been realized. 263 */ 264 if (kvm_enabled()) { 265 run_on_cpu(cs, s390_do_cpu_full_reset, RUN_ON_CPU_NULL); 266 } else { 267 cpu_reset(cs); 268 } 269 270 scc->parent_realize(dev, &err); 271 out: 272 error_propagate(errp, err); 273 } 274 275 static void s390_cpu_initfn(Object *obj) 276 { 277 CPUState *cs = CPU(obj); 278 279 cs->exception_index = EXCP_HLT; 280 281 #if !defined(CONFIG_USER_ONLY) 282 s390_cpu_init_sysemu(obj); 283 #endif 284 } 285 286 static const gchar *s390_gdb_arch_name(CPUState *cs) 287 { 288 return "s390:64-bit"; 289 } 290 291 static Property s390x_cpu_properties[] = { 292 #if !defined(CONFIG_USER_ONLY) 293 DEFINE_PROP_UINT32("core-id", S390CPU, env.core_id, 0), 294 DEFINE_PROP_INT32("socket-id", S390CPU, env.socket_id, -1), 295 DEFINE_PROP_INT32("book-id", S390CPU, env.book_id, -1), 296 DEFINE_PROP_INT32("drawer-id", S390CPU, env.drawer_id, -1), 297 DEFINE_PROP_BOOL("dedicated", S390CPU, env.dedicated, false), 298 DEFINE_PROP_CPUS390ENTITLEMENT("entitlement", S390CPU, env.entitlement, 299 S390_CPU_ENTITLEMENT_AUTO), 300 #endif 301 DEFINE_PROP_END_OF_LIST() 302 }; 303 304 static void s390_cpu_reset_full(DeviceState *dev) 305 { 306 CPUState *s = CPU(dev); 307 return s390_cpu_reset(s, S390_CPU_RESET_CLEAR); 308 } 309 310 #ifdef CONFIG_TCG 311 #include "hw/core/tcg-cpu-ops.h" 312 313 static const struct TCGCPUOps s390_tcg_ops = { 314 .initialize = s390x_translate_init, 315 .restore_state_to_opc = s390x_restore_state_to_opc, 316 317 #ifdef CONFIG_USER_ONLY 318 .record_sigsegv = s390_cpu_record_sigsegv, 319 .record_sigbus = s390_cpu_record_sigbus, 320 #else 321 .tlb_fill = s390_cpu_tlb_fill, 322 .cpu_exec_interrupt = s390_cpu_exec_interrupt, 323 .do_interrupt = s390_cpu_do_interrupt, 324 .debug_excp_handler = s390x_cpu_debug_excp_handler, 325 .do_unaligned_access = s390x_cpu_do_unaligned_access, 326 #endif /* !CONFIG_USER_ONLY */ 327 }; 328 #endif /* CONFIG_TCG */ 329 330 static void s390_cpu_class_init(ObjectClass *oc, void *data) 331 { 332 S390CPUClass *scc = S390_CPU_CLASS(oc); 333 CPUClass *cc = CPU_CLASS(scc); 334 DeviceClass *dc = DEVICE_CLASS(oc); 335 336 device_class_set_parent_realize(dc, s390_cpu_realizefn, 337 &scc->parent_realize); 338 device_class_set_props(dc, s390x_cpu_properties); 339 dc->user_creatable = true; 340 341 device_class_set_parent_reset(dc, s390_cpu_reset_full, &scc->parent_reset); 342 343 scc->reset = s390_cpu_reset; 344 cc->class_by_name = s390_cpu_class_by_name, 345 cc->has_work = s390_cpu_has_work; 346 cc->dump_state = s390_cpu_dump_state; 347 cc->query_cpu_fast = s390_query_cpu_fast; 348 cc->set_pc = s390_cpu_set_pc; 349 cc->get_pc = s390_cpu_get_pc; 350 cc->gdb_read_register = s390_cpu_gdb_read_register; 351 cc->gdb_write_register = s390_cpu_gdb_write_register; 352 #ifndef CONFIG_USER_ONLY 353 s390_cpu_class_init_sysemu(cc); 354 #endif 355 cc->disas_set_info = s390_cpu_disas_set_info; 356 cc->gdb_num_core_regs = S390_NUM_CORE_REGS; 357 cc->gdb_core_xml_file = "s390x-core64.xml"; 358 cc->gdb_arch_name = s390_gdb_arch_name; 359 360 s390_cpu_model_class_register_props(oc); 361 362 #ifdef CONFIG_TCG 363 cc->tcg_ops = &s390_tcg_ops; 364 #endif /* CONFIG_TCG */ 365 } 366 367 static const TypeInfo s390_cpu_type_info = { 368 .name = TYPE_S390_CPU, 369 .parent = TYPE_CPU, 370 .instance_size = sizeof(S390CPU), 371 .instance_align = __alignof__(S390CPU), 372 .instance_init = s390_cpu_initfn, 373 374 #ifndef CONFIG_USER_ONLY 375 .instance_finalize = s390_cpu_finalize, 376 #endif /* !CONFIG_USER_ONLY */ 377 378 .abstract = true, 379 .class_size = sizeof(S390CPUClass), 380 .class_init = s390_cpu_class_init, 381 }; 382 383 static void s390_cpu_register_types(void) 384 { 385 type_register_static(&s390_cpu_type_info); 386 } 387 388 type_init(s390_cpu_register_types) 389