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     typename = g_strdup_printf("%s-" TYPE_M68K_CPU, cpu_model);
  91     oc = object_class_by_name(typename);
  92     g_free(typename);
  93     if (oc != NULL && (object_class_dynamic_cast(oc, TYPE_M68K_CPU) == NULL ||
  94                        object_class_is_abstract(oc))) {
  95         return NULL;
  96     }
  97     return oc;
  98 }
  99
 100 static void m5206_cpu_initfn(Object *obj)
 101 {
 102     M68kCPU *cpu = M68K_CPU(obj);
 103     CPUM68KState *env = &cpu->env;
 104
 105     m68k_set_feature(env, M68K_FEATURE_CF_ISA_A);
 106 }
 107
 108 static void m68000_cpu_initfn(Object *obj)
 109 {
 110     M68kCPU *cpu = M68K_CPU(obj);
 111     CPUM68KState *env = &cpu->env;
 112
 113     m68k_set_feature(env, M68K_FEATURE_M68000);
 114     m68k_set_feature(env, M68K_FEATURE_USP);
 115     m68k_set_feature(env, M68K_FEATURE_WORD_INDEX);
 116 }
 117
 118 static void m68020_cpu_initfn(Object *obj)
 119 {
 120     M68kCPU *cpu = M68K_CPU(obj);
 121     CPUM68KState *env = &cpu->env;
 122
 123     m68k_set_feature(env, M68K_FEATURE_M68000);
 124     m68k_set_feature(env, M68K_FEATURE_USP);
 125     m68k_set_feature(env, M68K_FEATURE_WORD_INDEX);
 126     m68k_set_feature(env, M68K_FEATURE_QUAD_MULDIV);
 127     m68k_set_feature(env, M68K_FEATURE_BRAL);
 128     m68k_set_feature(env, M68K_FEATURE_BCCL);
 129     m68k_set_feature(env, M68K_FEATURE_BITFIELD);
 130     m68k_set_feature(env, M68K_FEATURE_EXT_FULL);
 131     m68k_set_feature(env, M68K_FEATURE_SCALED_INDEX);
 132     m68k_set_feature(env, M68K_FEATURE_LONG_MULDIV);
 133     m68k_set_feature(env, M68K_FEATURE_FPU);
 134     m68k_set_feature(env, M68K_FEATURE_CAS);
 135     m68k_set_feature(env, M68K_FEATURE_BKPT);
 136     m68k_set_feature(env, M68K_FEATURE_RTD);
 137 }
 138 #define m68030_cpu_initfn m68020_cpu_initfn
 139 #define m68040_cpu_initfn m68020_cpu_initfn
 140
 141 static void m68060_cpu_initfn(Object *obj)
 142 {
 143     M68kCPU *cpu = M68K_CPU(obj);
 144     CPUM68KState *env = &cpu->env;
 145
 146     m68k_set_feature(env, M68K_FEATURE_M68000);
 147     m68k_set_feature(env, M68K_FEATURE_USP);
 148     m68k_set_feature(env, M68K_FEATURE_WORD_INDEX);
 149     m68k_set_feature(env, M68K_FEATURE_BRAL);
 150     m68k_set_feature(env, M68K_FEATURE_BCCL);
 151     m68k_set_feature(env, M68K_FEATURE_BITFIELD);
 152     m68k_set_feature(env, M68K_FEATURE_EXT_FULL);
 153     m68k_set_feature(env, M68K_FEATURE_SCALED_INDEX);
 154     m68k_set_feature(env, M68K_FEATURE_LONG_MULDIV);
 155     m68k_set_feature(env, M68K_FEATURE_FPU);
 156     m68k_set_feature(env, M68K_FEATURE_CAS);
 157     m68k_set_feature(env, M68K_FEATURE_BKPT);
 158     m68k_set_feature(env, M68K_FEATURE_RTD);
 159 }
 160
 161 static void m5208_cpu_initfn(Object *obj)
 162 {
 163     M68kCPU *cpu = M68K_CPU(obj);
 164     CPUM68KState *env = &cpu->env;
 165
 166     m68k_set_feature(env, M68K_FEATURE_CF_ISA_A);
 167     m68k_set_feature(env, M68K_FEATURE_CF_ISA_APLUSC);
 168     m68k_set_feature(env, M68K_FEATURE_BRAL);
 169     m68k_set_feature(env, M68K_FEATURE_CF_EMAC);
 170     m68k_set_feature(env, M68K_FEATURE_USP);
 171 }
 172
 173 static void cfv4e_cpu_initfn(Object *obj)
 174 {
 175     M68kCPU *cpu = M68K_CPU(obj);
 176     CPUM68KState *env = &cpu->env;
 177
 178     m68k_set_feature(env, M68K_FEATURE_CF_ISA_A);
 179     m68k_set_feature(env, M68K_FEATURE_CF_ISA_B);
 180     m68k_set_feature(env, M68K_FEATURE_BRAL);
 181     m68k_set_feature(env, M68K_FEATURE_CF_FPU);
 182     m68k_set_feature(env, M68K_FEATURE_CF_EMAC);
 183     m68k_set_feature(env, M68K_FEATURE_USP);
 184 }
 185
 186 static void any_cpu_initfn(Object *obj)
 187 {
 188     M68kCPU *cpu = M68K_CPU(obj);
 189     CPUM68KState *env = &cpu->env;
 190
 191     m68k_set_feature(env, M68K_FEATURE_CF_ISA_A);
 192     m68k_set_feature(env, M68K_FEATURE_CF_ISA_B);
 193     m68k_set_feature(env, M68K_FEATURE_CF_ISA_APLUSC);
 194     m68k_set_feature(env, M68K_FEATURE_BRAL);
 195     m68k_set_feature(env, M68K_FEATURE_CF_FPU);
 196     /* MAC and EMAC are mututally exclusive, so pick EMAC.
 197        It's mostly backwards compatible.  */
 198     m68k_set_feature(env, M68K_FEATURE_CF_EMAC);
 199     m68k_set_feature(env, M68K_FEATURE_CF_EMAC_B);
 200     m68k_set_feature(env, M68K_FEATURE_USP);
 201     m68k_set_feature(env, M68K_FEATURE_EXT_FULL);
 202     m68k_set_feature(env, M68K_FEATURE_WORD_INDEX);
 203 }
 204
 205 typedef struct M68kCPUInfo {
 206     const char *name;
 207     void (*instance_init)(Object *obj);
 208 } M68kCPUInfo;
 209
 210 static const M68kCPUInfo m68k_cpus[] = {
 211     { .name = "m68000", .instance_init = m68000_cpu_initfn },
 212     { .name = "m68020", .instance_init = m68020_cpu_initfn },
 213     { .name = "m68030", .instance_init = m68030_cpu_initfn },
 214     { .name = "m68040", .instance_init = m68040_cpu_initfn },
 215     { .name = "m68060", .instance_init = m68060_cpu_initfn },
 216     { .name = "m5206", .instance_init = m5206_cpu_initfn },
 217     { .name = "m5208", .instance_init = m5208_cpu_initfn },
 218     { .name = "cfv4e", .instance_init = cfv4e_cpu_initfn },
 219     { .name = "any",   .instance_init = any_cpu_initfn },
 220 };
 221
 222 static void m68k_cpu_realizefn(DeviceState *dev, Error **errp)
 223 {
 224     CPUState *cs = CPU(dev);
 225     M68kCPU *cpu = M68K_CPU(dev);
 226     M68kCPUClass *mcc = M68K_CPU_GET_CLASS(dev);
 227     Error *local_err = NULL;
 228
 229     register_m68k_insns(&cpu->env);
 230
 231     cpu_exec_realizefn(cs, &local_err);
 232     if (local_err != NULL) {
 233         error_propagate(errp, local_err);
 234         return;
 235     }
 236
 237     m68k_cpu_init_gdb(cpu);
 238
 239     cpu_reset(cs);
 240     qemu_init_vcpu(cs);
 241
 242     mcc->parent_realize(dev, errp);
 243 }
 244
 245 static void m68k_cpu_initfn(Object *obj)
 246 {
 247     CPUState *cs = CPU(obj);
 248     M68kCPU *cpu = M68K_CPU(obj);
 249     CPUM68KState *env = &cpu->env;
 250     static bool inited;
 251
 252     cs->env_ptr = env;
 253
 254     if (tcg_enabled() && !inited) {
 255         inited = true;
 256         m68k_tcg_init();
 257     }
 258 }
 259
 260 static const VMStateDescription vmstate_m68k_cpu = {
 261     .name = "cpu",
 262     .unmigratable = 1,
 263 };
 264
 265 static void m68k_cpu_class_init(ObjectClass *c, void *data)
 266 {
 267     M68kCPUClass *mcc = M68K_CPU_CLASS(c);
 268     CPUClass *cc = CPU_CLASS(c);
 269     DeviceClass *dc = DEVICE_CLASS(c);
 270
 271     mcc->parent_realize = dc->realize;
 272     dc->realize = m68k_cpu_realizefn;
 273
 274     mcc->parent_reset = cc->reset;
 275     cc->reset = m68k_cpu_reset;
 276
 277     cc->class_by_name = m68k_cpu_class_by_name;
 278     cc->has_work = m68k_cpu_has_work;
 279     cc->do_interrupt = m68k_cpu_do_interrupt;
 280     cc->cpu_exec_interrupt = m68k_cpu_exec_interrupt;
 281     cc->dump_state = m68k_cpu_dump_state;
 282     cc->set_pc = m68k_cpu_set_pc;
 283     cc->gdb_read_register = m68k_cpu_gdb_read_register;
 284     cc->gdb_write_register = m68k_cpu_gdb_write_register;
 285 #ifdef CONFIG_USER_ONLY
 286     cc->handle_mmu_fault = m68k_cpu_handle_mmu_fault;
 287 #else
 288     cc->get_phys_page_debug = m68k_cpu_get_phys_page_debug;
 289 #endif
 290     cc->disas_set_info = m68k_cpu_disas_set_info;
 291
 292     cc->gdb_num_core_regs = 18;
 293     cc->gdb_core_xml_file = "cf-core.xml";
 294
 295     dc->vmsd = &vmstate_m68k_cpu;
 296 }
 297
 298 static void register_cpu_type(const M68kCPUInfo *info)
 299 {
 300     TypeInfo type_info = {
 301         .parent = TYPE_M68K_CPU,
 302         .instance_init = info->instance_init,
 303     };
 304
 305     type_info.name = g_strdup_printf("%s-" TYPE_M68K_CPU, info->name);
 306     type_register(&type_info);
 307     g_free((void *)type_info.name);
 308 }
 309
 310 static const TypeInfo m68k_cpu_type_info = {
 311     .name = TYPE_M68K_CPU,
 312     .parent = TYPE_CPU,
 313     .instance_size = sizeof(M68kCPU),
 314     .instance_init = m68k_cpu_initfn,
 315     .abstract = true,
 316     .class_size = sizeof(M68kCPUClass),
 317     .class_init = m68k_cpu_class_init,
 318 };
 319
 320 static void m68k_cpu_register_types(void)
 321 {
 322     int i;
 323
 324     type_register_static(&m68k_cpu_type_info);
 325     for (i = 0; i < ARRAY_SIZE(m68k_cpus); i++) {
 326         register_cpu_type(&m68k_cpus[i]);
 327     }
 328 }
 329
 330 type_init(m68k_cpu_register_types)