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