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