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