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 .restore_state_to_opc = s390x_restore_state_to_opc, 276 277 #ifdef CONFIG_USER_ONLY 278 .record_sigsegv = s390_cpu_record_sigsegv, 279 .record_sigbus = s390_cpu_record_sigbus, 280 #else 281 .tlb_fill = s390_cpu_tlb_fill, 282 .cpu_exec_interrupt = s390_cpu_exec_interrupt, 283 .do_interrupt = s390_cpu_do_interrupt, 284 .debug_excp_handler = s390x_cpu_debug_excp_handler, 285 .do_unaligned_access = s390x_cpu_do_unaligned_access, 286 #endif /* !CONFIG_USER_ONLY */ 287 }; 288 #endif /* CONFIG_TCG */ 289 290 static void s390_cpu_class_init(ObjectClass *oc, void *data) 291 { 292 S390CPUClass *scc = S390_CPU_CLASS(oc); 293 CPUClass *cc = CPU_CLASS(scc); 294 DeviceClass *dc = DEVICE_CLASS(oc); 295 296 device_class_set_parent_realize(dc, s390_cpu_realizefn, 297 &scc->parent_realize); 298 device_class_set_props(dc, s390x_cpu_properties); 299 dc->user_creatable = true; 300 301 device_class_set_parent_reset(dc, s390_cpu_reset_full, &scc->parent_reset); 302 303 scc->reset = s390_cpu_reset; 304 cc->class_by_name = s390_cpu_class_by_name, 305 cc->has_work = s390_cpu_has_work; 306 cc->dump_state = s390_cpu_dump_state; 307 cc->set_pc = s390_cpu_set_pc; 308 cc->get_pc = s390_cpu_get_pc; 309 cc->gdb_read_register = s390_cpu_gdb_read_register; 310 cc->gdb_write_register = s390_cpu_gdb_write_register; 311 #ifndef CONFIG_USER_ONLY 312 s390_cpu_class_init_sysemu(cc); 313 #endif 314 cc->disas_set_info = s390_cpu_disas_set_info; 315 cc->gdb_num_core_regs = S390_NUM_CORE_REGS; 316 cc->gdb_core_xml_file = "s390x-core64.xml"; 317 cc->gdb_arch_name = s390_gdb_arch_name; 318 319 s390_cpu_model_class_register_props(oc); 320 321 #ifdef CONFIG_TCG 322 cc->tcg_ops = &s390_tcg_ops; 323 #endif /* CONFIG_TCG */ 324 } 325 326 static const TypeInfo s390_cpu_type_info = { 327 .name = TYPE_S390_CPU, 328 .parent = TYPE_CPU, 329 .instance_size = sizeof(S390CPU), 330 .instance_align = __alignof__(S390CPU), 331 .instance_init = s390_cpu_initfn, 332 333 #ifndef CONFIG_USER_ONLY 334 .instance_finalize = s390_cpu_finalize, 335 #endif /* !CONFIG_USER_ONLY */ 336 337 .abstract = true, 338 .class_size = sizeof(S390CPUClass), 339 .class_init = s390_cpu_class_init, 340 }; 341 342 static void s390_cpu_register_types(void) 343 { 344 type_register_static(&s390_cpu_type_info); 345 } 346 347 type_init(s390_cpu_register_types) 348