qemu/target/m68k/cpu.c
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   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
  29static void m68k_cpu_set_pc(CPUState *cs, vaddr value)
  30{
  31    M68kCPU *cpu = M68K_CPU(cs);
  32
  33    cpu->env.pc = value;
  34}
  35
  36static bool m68k_cpu_has_work(CPUState *cs)
  37{
  38    return cs->interrupt_request & CPU_INTERRUPT_HARD;
  39}
  40
  41static void m68k_set_feature(CPUM68KState *env, int feature)
  42{
  43    env->features |= (1u << feature);
  44}
  45
  46/* CPUClass::reset() */
  47static 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
  73static 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
  85static 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
 104static 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
 112static 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
 122static 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
 145static 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
 165static 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
 177static 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
 190static 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
 209typedef struct M68kCPUInfo {
 210    const char *name;
 211    void (*instance_init)(Object *obj);
 212} M68kCPUInfo;
 213
 214static 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
 226static 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
 247static 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
 262static const VMStateDescription vmstate_m68k_cpu = {
 263    .name = "cpu",
 264    .unmigratable = 1,
 265};
 266
 267static 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
 300static 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
 312static 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
 322static 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
 332type_init(m68k_cpu_register_types)
 333
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