target/m68k/cpu.c

   1 /*
   2  * QEMU Motorola 68k CPU
   3  *
   4  * Copyright (c) 2012 SUSE LINUX Products GmbH
   5  *
   6  * This library is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU Lesser General Public
   8  * License as published by the Free Software Foundation; either
   9  * version 2.1 of the License, or (at your option) any later version.
  10  *
  11  * This library is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * Lesser General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Lesser General Public
  17  * License along with this library; if not, see
  18  * <http://www.gnu.org/licenses/lgpl-2.1.html>
  19  */
  20
  21 #include "qemu/osdep.h"
  22 #include "qapi/error.h"
  23 #include "cpu.h"
  24 #include "qemu-common.h"
  25 #include "migration/vmstate.h"
  26 #include "exec/exec-all.h"
  27
  28
  29 static void m68k_cpu_set_pc(CPUState *cs, vaddr value)
  30 {
  31     M68kCPU *cpu = M68K_CPU(cs);
  32
  33     cpu->env.pc = value;
  34 }
  35
  36 static bool m68k_cpu_has_work(CPUState *cs)
  37 {
  38     return cs->interrupt_request & CPU_INTERRUPT_HARD;
  39 }
  40
  41 static void m68k_set_feature(CPUM68KState *env, int feature)
  42 {
  43     env->features |= (1u << feature);
  44 }
  45
  46 /* CPUClass::reset() */
  47 static void m68k_cpu_reset(CPUState *s)
  48 {
  49     M68kCPU *cpu = M68K_CPU(s);
  50     M68kCPUClass *mcc = M68K_CPU_GET_CLASS(cpu);
  51     CPUM68KState *env = &cpu->env;
  52     floatx80 nan = floatx80_default_nan(NULL);
  53     int i;
  54
  55     mcc->parent_reset(s);
  56
  57     memset(env, 0, offsetof(CPUM68KState, end_reset_fields));
  58 #if !defined(CONFIG_USER_ONLY)
  59     env->sr = 0x2700;
  60 #endif
  61     m68k_switch_sp(env);
  62     for (i = 0; i < 8; i++) {
  63         env->fregs[i].d = nan;
  64     }
  65     cpu_m68k_set_fpcr(env, 0);
  66     env->fpsr = 0;
  67
  68     cpu_m68k_set_ccr(env, 0);
  69     /* TODO: We should set PC from the interrupt vector.  */
  70     env->pc = 0;
  71 }
  72
  73 static void m68k_cpu_disas_set_info(CPUState *s, disassemble_info *info)
  74 {
  75     M68kCPU *cpu = M68K_CPU(s);
  76     CPUM68KState *env = &cpu->env;
  77     info->print_insn = print_insn_m68k;
  78     if (m68k_feature(env, M68K_FEATURE_M68000)) {
  79         info->mach = bfd_mach_m68040;
  80     }
  81 }
  82
  83 /* CPU models */
  84
  85 static ObjectClass *m68k_cpu_class_by_name(const char *cpu_model)
  86 {
  87     ObjectClass *oc;
  88     char *typename;
  89
  90     if (cpu_model == NULL) {
  91         return NULL;
  92     }
  93
  94     typename = g_strdup_printf("%s-" TYPE_M68K_CPU, cpu_model);
  95     oc = object_class_by_name(typename);
  96     g_free(typename);
  97     if (oc != NULL && (object_class_dynamic_cast(oc, TYPE_M68K_CPU) == NULL ||
  98                        object_class_is_abstract(oc))) {
  99         return NULL;
 100     }
 101     return oc;
 102 }
 103
 104 static void m5206_cpu_initfn(Object *obj)
 105 {
 106     M68kCPU *cpu = M68K_CPU(obj);
 107     CPUM68KState *env = &cpu->env;
 108
 109     m68k_set_feature(env, M68K_FEATURE_CF_ISA_A);
 110 }
 111
 112 static void m68000_cpu_initfn(Object *obj)
 113 {
 114     M68kCPU *cpu = M68K_CPU(obj);
 115     CPUM68KState *env = &cpu->env;
 116
 117     m68k_set_feature(env, M68K_FEATURE_M68000);
 118     m68k_set_feature(env, M68K_FEATURE_USP);
 119     m68k_set_feature(env, M68K_FEATURE_WORD_INDEX);
 120 }
 121
 122 static void m68020_cpu_initfn(Object *obj)
 123 {
 124     M68kCPU *cpu = M68K_CPU(obj);
 125     CPUM68KState *env = &cpu->env;
 126
 127     m68k_set_feature(env, M68K_FEATURE_M68000);
 128     m68k_set_feature(env, M68K_FEATURE_USP);
 129     m68k_set_feature(env, M68K_FEATURE_WORD_INDEX);
 130     m68k_set_feature(env, M68K_FEATURE_QUAD_MULDIV);
 131     m68k_set_feature(env, M68K_FEATURE_BRAL);
 132     m68k_set_feature(env, M68K_FEATURE_BCCL);
 133     m68k_set_feature(env, M68K_FEATURE_BITFIELD);
 134     m68k_set_feature(env, M68K_FEATURE_EXT_FULL);
 135     m68k_set_feature(env, M68K_FEATURE_SCALED_INDEX);
 136     m68k_set_feature(env, M68K_FEATURE_LONG_MULDIV);
 137     m68k_set_feature(env, M68K_FEATURE_FPU);
 138     m68k_set_feature(env, M68K_FEATURE_CAS);
 139     m68k_set_feature(env, M68K_FEATURE_BKPT);
 140     m68k_set_feature(env, M68K_FEATURE_RTD);
 141 }
 142 #define m68030_cpu_initfn m68020_cpu_initfn
 143 #define m68040_cpu_initfn m68020_cpu_initfn
 144
 145 static void m68060_cpu_initfn(Object *obj)
 146 {
 147     M68kCPU *cpu = M68K_CPU(obj);
 148     CPUM68KState *env = &cpu->env;
 149
 150     m68k_set_feature(env, M68K_FEATURE_M68000);
 151     m68k_set_feature(env, M68K_FEATURE_USP);
 152     m68k_set_feature(env, M68K_FEATURE_WORD_INDEX);
 153     m68k_set_feature(env, M68K_FEATURE_BRAL);
 154     m68k_set_feature(env, M68K_FEATURE_BCCL);
 155     m68k_set_feature(env, M68K_FEATURE_BITFIELD);
 156     m68k_set_feature(env, M68K_FEATURE_EXT_FULL);
 157     m68k_set_feature(env, M68K_FEATURE_SCALED_INDEX);
 158     m68k_set_feature(env, M68K_FEATURE_LONG_MULDIV);
 159     m68k_set_feature(env, M68K_FEATURE_FPU);
 160     m68k_set_feature(env, M68K_FEATURE_CAS);
 161     m68k_set_feature(env, M68K_FEATURE_BKPT);
 162     m68k_set_feature(env, M68K_FEATURE_RTD);
 163 }
 164
 165 static void m5208_cpu_initfn(Object *obj)
 166 {
 167     M68kCPU *cpu = M68K_CPU(obj);
 168     CPUM68KState *env = &cpu->env;
 169
 170     m68k_set_feature(env, M68K_FEATURE_CF_ISA_A);
 171     m68k_set_feature(env, M68K_FEATURE_CF_ISA_APLUSC);
 172     m68k_set_feature(env, M68K_FEATURE_BRAL);
 173     m68k_set_feature(env, M68K_FEATURE_CF_EMAC);
 174     m68k_set_feature(env, M68K_FEATURE_USP);
 175 }
 176
 177 static void cfv4e_cpu_initfn(Object *obj)
 178 {
 179     M68kCPU *cpu = M68K_CPU(obj);
 180     CPUM68KState *env = &cpu->env;
 181
 182     m68k_set_feature(env, M68K_FEATURE_CF_ISA_A);
 183     m68k_set_feature(env, M68K_FEATURE_CF_ISA_B);
 184     m68k_set_feature(env, M68K_FEATURE_BRAL);
 185     m68k_set_feature(env, M68K_FEATURE_CF_FPU);
 186     m68k_set_feature(env, M68K_FEATURE_CF_EMAC);
 187     m68k_set_feature(env, M68K_FEATURE_USP);
 188 }
 189
 190 static void any_cpu_initfn(Object *obj)
 191 {
 192     M68kCPU *cpu = M68K_CPU(obj);
 193     CPUM68KState *env = &cpu->env;
 194
 195     m68k_set_feature(env, M68K_FEATURE_CF_ISA_A);
 196     m68k_set_feature(env, M68K_FEATURE_CF_ISA_B);
 197     m68k_set_feature(env, M68K_FEATURE_CF_ISA_APLUSC);
 198     m68k_set_feature(env, M68K_FEATURE_BRAL);
 199     m68k_set_feature(env, M68K_FEATURE_CF_FPU);
 200     /* MAC and EMAC are mututally exclusive, so pick EMAC.
 201        It's mostly backwards compatible.  */
 202     m68k_set_feature(env, M68K_FEATURE_CF_EMAC);
 203     m68k_set_feature(env, M68K_FEATURE_CF_EMAC_B);
 204     m68k_set_feature(env, M68K_FEATURE_USP);
 205     m68k_set_feature(env, M68K_FEATURE_EXT_FULL);
 206     m68k_set_feature(env, M68K_FEATURE_WORD_INDEX);
 207 }
 208
 209 typedef struct M68kCPUInfo {
 210     const char *name;
 211     void (*instance_init)(Object *obj);
 212 } M68kCPUInfo;
 213
 214 static const M68kCPUInfo m68k_cpus[] = {
 215     { .name = "m68000", .instance_init = m68000_cpu_initfn },
 216     { .name = "m68020", .instance_init = m68020_cpu_initfn },
 217     { .name = "m68030", .instance_init = m68030_cpu_initfn },
 218     { .name = "m68040", .instance_init = m68040_cpu_initfn },
 219     { .name = "m68060", .instance_init = m68060_cpu_initfn },
 220     { .name = "m5206", .instance_init = m5206_cpu_initfn },
 221     { .name = "m5208", .instance_init = m5208_cpu_initfn },
 222     { .name = "cfv4e", .instance_init = cfv4e_cpu_initfn },
 223     { .name = "any",   .instance_init = any_cpu_initfn },
 224 };
 225
 226 static void m68k_cpu_realizefn(DeviceState *dev, Error **errp)
 227 {
 228     CPUState *cs = CPU(dev);
 229     M68kCPU *cpu = M68K_CPU(dev);
 230     M68kCPUClass *mcc = M68K_CPU_GET_CLASS(dev);
 231     Error *local_err = NULL;
 232
 233     cpu_exec_realizefn(cs, &local_err);
 234     if (local_err != NULL) {
 235         error_propagate(errp, local_err);
 236         return;
 237     }
 238
 239     m68k_cpu_init_gdb(cpu);
 240
 241     cpu_reset(cs);
 242     qemu_init_vcpu(cs);
 243
 244     mcc->parent_realize(dev, errp);
 245 }
 246
 247 static void m68k_cpu_initfn(Object *obj)
 248 {
 249     CPUState *cs = CPU(obj);
 250     M68kCPU *cpu = M68K_CPU(obj);
 251     CPUM68KState *env = &cpu->env;
 252     static bool inited;
 253
 254     cs->env_ptr = env;
 255
 256     if (tcg_enabled() && !inited) {
 257         inited = true;
 258         m68k_tcg_init();
 259     }
 260 }
 261
 262 static const VMStateDescription vmstate_m68k_cpu = {
 263     .name = "cpu",
 264     .unmigratable = 1,
 265 };
 266
 267 static void m68k_cpu_class_init(ObjectClass *c, void *data)
 268 {
 269     M68kCPUClass *mcc = M68K_CPU_CLASS(c);
 270     CPUClass *cc = CPU_CLASS(c);
 271     DeviceClass *dc = DEVICE_CLASS(c);
 272
 273     mcc->parent_realize = dc->realize;
 274     dc->realize = m68k_cpu_realizefn;
 275
 276     mcc->parent_reset = cc->reset;
 277     cc->reset = m68k_cpu_reset;
 278
 279     cc->class_by_name = m68k_cpu_class_by_name;
 280     cc->has_work = m68k_cpu_has_work;
 281     cc->do_interrupt = m68k_cpu_do_interrupt;
 282     cc->cpu_exec_interrupt = m68k_cpu_exec_interrupt;
 283     cc->dump_state = m68k_cpu_dump_state;
 284     cc->set_pc = m68k_cpu_set_pc;
 285     cc->gdb_read_register = m68k_cpu_gdb_read_register;
 286     cc->gdb_write_register = m68k_cpu_gdb_write_register;
 287 #ifdef CONFIG_USER_ONLY
 288     cc->handle_mmu_fault = m68k_cpu_handle_mmu_fault;
 289 #else
 290     cc->get_phys_page_debug = m68k_cpu_get_phys_page_debug;
 291 #endif
 292     cc->disas_set_info = m68k_cpu_disas_set_info;
 293
 294     cc->gdb_num_core_regs = 18;
 295     cc->gdb_core_xml_file = "cf-core.xml";
 296
 297     dc->vmsd = &vmstate_m68k_cpu;
 298 }
 299
 300 static void register_cpu_type(const M68kCPUInfo *info)
 301 {
 302     TypeInfo type_info = {
 303         .parent = TYPE_M68K_CPU,
 304         .instance_init = info->instance_init,
 305     };
 306
 307     type_info.name = g_strdup_printf("%s-" TYPE_M68K_CPU, info->name);
 308     type_register(&type_info);
 309     g_free((void *)type_info.name);
 310 }
 311
 312 static const TypeInfo m68k_cpu_type_info = {
 313     .name = TYPE_M68K_CPU,
 314     .parent = TYPE_CPU,
 315     .instance_size = sizeof(M68kCPU),
 316     .instance_init = m68k_cpu_initfn,
 317     .abstract = true,
 318     .class_size = sizeof(M68kCPUClass),
 319     .class_init = m68k_cpu_class_init,
 320 };
 321
 322 static void m68k_cpu_register_types(void)
 323 {
 324     int i;
 325
 326     type_register_static(&m68k_cpu_type_info);
 327     for (i = 0; i < ARRAY_SIZE(m68k_cpus); i++) {
 328         register_cpu_type(&m68k_cpus[i]);
 329     }
 330 }
 331
 332 type_init(m68k_cpu_register_types)