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
  53    mcc->parent_reset(s);
  54
  55    memset(env, 0, offsetof(CPUM68KState, features));
  56#if !defined(CONFIG_USER_ONLY)
  57    env->sr = 0x2700;
  58#endif
  59    m68k_switch_sp(env);
  60    /* ??? FP regs should be initialized to NaN.  */
  61    cpu_m68k_set_ccr(env, 0);
  62    /* TODO: We should set PC from the interrupt vector.  */
  63    env->pc = 0;
  64    tlb_flush(s, 1);
  65}
  66
  67static void m68k_cpu_disas_set_info(CPUState *s, disassemble_info *info)
  68{
  69    M68kCPU *cpu = M68K_CPU(s);
  70    CPUM68KState *env = &cpu->env;
  71    info->print_insn = print_insn_m68k;
  72    if (m68k_feature(env, M68K_FEATURE_M68000)) {
  73        info->mach = bfd_mach_m68040;
  74    }
  75}
  76
  77/* CPU models */
  78
  79static ObjectClass *m68k_cpu_class_by_name(const char *cpu_model)
  80{
  81    ObjectClass *oc;
  82    char *typename;
  83
  84    if (cpu_model == NULL) {
  85        return NULL;
  86    }
  87
  88    typename = g_strdup_printf("%s-" TYPE_M68K_CPU, cpu_model);
  89    oc = object_class_by_name(typename);
  90    g_free(typename);
  91    if (oc != NULL && (object_class_dynamic_cast(oc, TYPE_M68K_CPU) == NULL ||
  92                       object_class_is_abstract(oc))) {
  93        return NULL;
  94    }
  95    return oc;
  96}
  97
  98static void m5206_cpu_initfn(Object *obj)
  99{
 100    M68kCPU *cpu = M68K_CPU(obj);
 101    CPUM68KState *env = &cpu->env;
 102
 103    m68k_set_feature(env, M68K_FEATURE_CF_ISA_A);
 104}
 105
 106static void m68000_cpu_initfn(Object *obj)
 107{
 108    M68kCPU *cpu = M68K_CPU(obj);
 109    CPUM68KState *env = &cpu->env;
 110
 111    m68k_set_feature(env, M68K_FEATURE_M68000);
 112    m68k_set_feature(env, M68K_FEATURE_USP);
 113    m68k_set_feature(env, M68K_FEATURE_WORD_INDEX);
 114}
 115
 116static void m68020_cpu_initfn(Object *obj)
 117{
 118    M68kCPU *cpu = M68K_CPU(obj);
 119    CPUM68KState *env = &cpu->env;
 120
 121    m68k_set_feature(env, M68K_FEATURE_M68000);
 122    m68k_set_feature(env, M68K_FEATURE_USP);
 123    m68k_set_feature(env, M68K_FEATURE_WORD_INDEX);
 124    m68k_set_feature(env, M68K_FEATURE_QUAD_MULDIV);
 125    m68k_set_feature(env, M68K_FEATURE_BRAL);
 126    m68k_set_feature(env, M68K_FEATURE_BCCL);
 127    m68k_set_feature(env, M68K_FEATURE_BITFIELD);
 128    m68k_set_feature(env, M68K_FEATURE_EXT_FULL);
 129    m68k_set_feature(env, M68K_FEATURE_SCALED_INDEX);
 130    m68k_set_feature(env, M68K_FEATURE_LONG_MULDIV);
 131    m68k_set_feature(env, M68K_FEATURE_FPU);
 132    m68k_set_feature(env, M68K_FEATURE_CAS);
 133    m68k_set_feature(env, M68K_FEATURE_BKPT);
 134}
 135#define m68030_cpu_initfn m68020_cpu_initfn
 136#define m68040_cpu_initfn m68020_cpu_initfn
 137
 138static void m68060_cpu_initfn(Object *obj)
 139{
 140    M68kCPU *cpu = M68K_CPU(obj);
 141    CPUM68KState *env = &cpu->env;
 142
 143    m68k_set_feature(env, M68K_FEATURE_M68000);
 144    m68k_set_feature(env, M68K_FEATURE_USP);
 145    m68k_set_feature(env, M68K_FEATURE_WORD_INDEX);
 146    m68k_set_feature(env, M68K_FEATURE_BRAL);
 147    m68k_set_feature(env, M68K_FEATURE_BCCL);
 148    m68k_set_feature(env, M68K_FEATURE_BITFIELD);
 149    m68k_set_feature(env, M68K_FEATURE_EXT_FULL);
 150    m68k_set_feature(env, M68K_FEATURE_SCALED_INDEX);
 151    m68k_set_feature(env, M68K_FEATURE_LONG_MULDIV);
 152    m68k_set_feature(env, M68K_FEATURE_FPU);
 153    m68k_set_feature(env, M68K_FEATURE_CAS);
 154    m68k_set_feature(env, M68K_FEATURE_BKPT);
 155}
 156
 157static void m5208_cpu_initfn(Object *obj)
 158{
 159    M68kCPU *cpu = M68K_CPU(obj);
 160    CPUM68KState *env = &cpu->env;
 161
 162    m68k_set_feature(env, M68K_FEATURE_CF_ISA_A);
 163    m68k_set_feature(env, M68K_FEATURE_CF_ISA_APLUSC);
 164    m68k_set_feature(env, M68K_FEATURE_BRAL);
 165    m68k_set_feature(env, M68K_FEATURE_CF_EMAC);
 166    m68k_set_feature(env, M68K_FEATURE_USP);
 167}
 168
 169static void cfv4e_cpu_initfn(Object *obj)
 170{
 171    M68kCPU *cpu = M68K_CPU(obj);
 172    CPUM68KState *env = &cpu->env;
 173
 174    m68k_set_feature(env, M68K_FEATURE_CF_ISA_A);
 175    m68k_set_feature(env, M68K_FEATURE_CF_ISA_B);
 176    m68k_set_feature(env, M68K_FEATURE_BRAL);
 177    m68k_set_feature(env, M68K_FEATURE_CF_FPU);
 178    m68k_set_feature(env, M68K_FEATURE_CF_EMAC);
 179    m68k_set_feature(env, M68K_FEATURE_USP);
 180}
 181
 182static void any_cpu_initfn(Object *obj)
 183{
 184    M68kCPU *cpu = M68K_CPU(obj);
 185    CPUM68KState *env = &cpu->env;
 186
 187    m68k_set_feature(env, M68K_FEATURE_CF_ISA_A);
 188    m68k_set_feature(env, M68K_FEATURE_CF_ISA_B);
 189    m68k_set_feature(env, M68K_FEATURE_CF_ISA_APLUSC);
 190    m68k_set_feature(env, M68K_FEATURE_BRAL);
 191    m68k_set_feature(env, M68K_FEATURE_CF_FPU);
 192    /* MAC and EMAC are mututally exclusive, so pick EMAC.
 193       It's mostly backwards compatible.  */
 194    m68k_set_feature(env, M68K_FEATURE_CF_EMAC);
 195    m68k_set_feature(env, M68K_FEATURE_CF_EMAC_B);
 196    m68k_set_feature(env, M68K_FEATURE_USP);
 197    m68k_set_feature(env, M68K_FEATURE_EXT_FULL);
 198    m68k_set_feature(env, M68K_FEATURE_WORD_INDEX);
 199}
 200
 201typedef struct M68kCPUInfo {
 202    const char *name;
 203    void (*instance_init)(Object *obj);
 204} M68kCPUInfo;
 205
 206static const M68kCPUInfo m68k_cpus[] = {
 207    { .name = "m68000", .instance_init = m68000_cpu_initfn },
 208    { .name = "m68020", .instance_init = m68020_cpu_initfn },
 209    { .name = "m68030", .instance_init = m68030_cpu_initfn },
 210    { .name = "m68040", .instance_init = m68040_cpu_initfn },
 211    { .name = "m68060", .instance_init = m68060_cpu_initfn },
 212    { .name = "m5206", .instance_init = m5206_cpu_initfn },
 213    { .name = "m5208", .instance_init = m5208_cpu_initfn },
 214    { .name = "cfv4e", .instance_init = cfv4e_cpu_initfn },
 215    { .name = "any",   .instance_init = any_cpu_initfn },
 216};
 217
 218static void m68k_cpu_realizefn(DeviceState *dev, Error **errp)
 219{
 220    CPUState *cs = CPU(dev);
 221    M68kCPU *cpu = M68K_CPU(dev);
 222    M68kCPUClass *mcc = M68K_CPU_GET_CLASS(dev);
 223    Error *local_err = NULL;
 224
 225    cpu_exec_realizefn(cs, &local_err);
 226    if (local_err != NULL) {
 227        error_propagate(errp, local_err);
 228        return;
 229    }
 230
 231    m68k_cpu_init_gdb(cpu);
 232
 233    cpu_reset(cs);
 234    qemu_init_vcpu(cs);
 235
 236    mcc->parent_realize(dev, errp);
 237}
 238
 239static void m68k_cpu_initfn(Object *obj)
 240{
 241    CPUState *cs = CPU(obj);
 242    M68kCPU *cpu = M68K_CPU(obj);
 243    CPUM68KState *env = &cpu->env;
 244    static bool inited;
 245
 246    cs->env_ptr = env;
 247
 248    if (tcg_enabled() && !inited) {
 249        inited = true;
 250        m68k_tcg_init();
 251    }
 252}
 253
 254static const VMStateDescription vmstate_m68k_cpu = {
 255    .name = "cpu",
 256    .unmigratable = 1,
 257};
 258
 259static void m68k_cpu_class_init(ObjectClass *c, void *data)
 260{
 261    M68kCPUClass *mcc = M68K_CPU_CLASS(c);
 262    CPUClass *cc = CPU_CLASS(c);
 263    DeviceClass *dc = DEVICE_CLASS(c);
 264
 265    mcc->parent_realize = dc->realize;
 266    dc->realize = m68k_cpu_realizefn;
 267
 268    mcc->parent_reset = cc->reset;
 269    cc->reset = m68k_cpu_reset;
 270
 271    cc->class_by_name = m68k_cpu_class_by_name;
 272    cc->has_work = m68k_cpu_has_work;
 273    cc->do_interrupt = m68k_cpu_do_interrupt;
 274    cc->cpu_exec_interrupt = m68k_cpu_exec_interrupt;
 275    cc->dump_state = m68k_cpu_dump_state;
 276    cc->set_pc = m68k_cpu_set_pc;
 277    cc->gdb_read_register = m68k_cpu_gdb_read_register;
 278    cc->gdb_write_register = m68k_cpu_gdb_write_register;
 279#ifdef CONFIG_USER_ONLY
 280    cc->handle_mmu_fault = m68k_cpu_handle_mmu_fault;
 281#else
 282    cc->get_phys_page_debug = m68k_cpu_get_phys_page_debug;
 283#endif
 284    cc->disas_set_info = m68k_cpu_disas_set_info;
 285
 286    cc->gdb_num_core_regs = 18;
 287    cc->gdb_core_xml_file = "cf-core.xml";
 288
 289    dc->vmsd = &vmstate_m68k_cpu;
 290}
 291
 292static void register_cpu_type(const M68kCPUInfo *info)
 293{
 294    TypeInfo type_info = {
 295        .parent = TYPE_M68K_CPU,
 296        .instance_init = info->instance_init,
 297    };
 298
 299    type_info.name = g_strdup_printf("%s-" TYPE_M68K_CPU, info->name);
 300    type_register(&type_info);
 301    g_free((void *)type_info.name);
 302}
 303
 304static const TypeInfo m68k_cpu_type_info = {
 305    .name = TYPE_M68K_CPU,
 306    .parent = TYPE_CPU,
 307    .instance_size = sizeof(M68kCPU),
 308    .instance_init = m68k_cpu_initfn,
 309    .abstract = true,
 310    .class_size = sizeof(M68kCPUClass),
 311    .class_init = m68k_cpu_class_init,
 312};
 313
 314static void m68k_cpu_register_types(void)
 315{
 316    int i;
 317
 318    type_register_static(&m68k_cpu_type_info);
 319    for (i = 0; i < ARRAY_SIZE(m68k_cpus); i++) {
 320        register_cpu_type(&m68k_cpus[i]);
 321    }
 322}
 323
 324type_init(m68k_cpu_register_types)
 325
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