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 "cpu.h"
  23 #include "qemu-common.h"
  24 #include "migration/vmstate.h"
  25
  26
  27 static void m68k_cpu_set_pc(CPUState *cs, vaddr value)
  28 {
  29     M68kCPU *cpu = M68K_CPU(cs);
  30
  31     cpu->env.pc = value;
  32 }
  33
  34 static bool m68k_cpu_has_work(CPUState *cs)
  35 {
  36     return cs->interrupt_request & CPU_INTERRUPT_HARD;
  37 }
  38
  39 static void m68k_set_feature(CPUM68KState *env, int feature)
  40 {
  41     env->features |= (1u << feature);
  42 }
  43
  44 /* CPUClass::reset() */
  45 static void m68k_cpu_reset(CPUState *s)
  46 {
  47     M68kCPU *cpu = M68K_CPU(s);
  48     M68kCPUClass *mcc = M68K_CPU_GET_CLASS(cpu);
  49     CPUM68KState *env = &cpu->env;
  50
  51     mcc->parent_reset(s);
  52
  53     memset(env, 0, offsetof(CPUM68KState, features));
  54 #if !defined(CONFIG_USER_ONLY)
  55     env->sr = 0x2700;
  56 #endif
  57     m68k_switch_sp(env);
  58     /* ??? FP regs should be initialized to NaN.  */
  59     env->cc_op = CC_OP_FLAGS;
  60     /* TODO: We should set PC from the interrupt vector.  */
  61     env->pc = 0;
  62     tlb_flush(s, 1);
  63 }
  64
  65 static void m68k_cpu_disas_set_info(CPUState *cpu, disassemble_info *info)
  66 {
  67     info->print_insn = print_insn_m68k;
  68 }
  69
  70 /* CPU models */
  71
  72 static ObjectClass *m68k_cpu_class_by_name(const char *cpu_model)
  73 {
  74     ObjectClass *oc;
  75     char *typename;
  76
  77     if (cpu_model == NULL) {
  78         return NULL;
  79     }
  80
  81     typename = g_strdup_printf("%s-" TYPE_M68K_CPU, cpu_model);
  82     oc = object_class_by_name(typename);
  83     g_free(typename);
  84     if (oc != NULL && (object_class_dynamic_cast(oc, TYPE_M68K_CPU) == NULL ||
  85                        object_class_is_abstract(oc))) {
  86         return NULL;
  87     }
  88     return oc;
  89 }
  90
  91 static void m5206_cpu_initfn(Object *obj)
  92 {
  93     M68kCPU *cpu = M68K_CPU(obj);
  94     CPUM68KState *env = &cpu->env;
  95
  96     m68k_set_feature(env, M68K_FEATURE_CF_ISA_A);
  97 }
  98
  99 static void m5208_cpu_initfn(Object *obj)
 100 {
 101     M68kCPU *cpu = M68K_CPU(obj);
 102     CPUM68KState *env = &cpu->env;
 103
 104     m68k_set_feature(env, M68K_FEATURE_CF_ISA_A);
 105     m68k_set_feature(env, M68K_FEATURE_CF_ISA_APLUSC);
 106     m68k_set_feature(env, M68K_FEATURE_BRAL);
 107     m68k_set_feature(env, M68K_FEATURE_CF_EMAC);
 108     m68k_set_feature(env, M68K_FEATURE_USP);
 109 }
 110
 111 static void cfv4e_cpu_initfn(Object *obj)
 112 {
 113     M68kCPU *cpu = M68K_CPU(obj);
 114     CPUM68KState *env = &cpu->env;
 115
 116     m68k_set_feature(env, M68K_FEATURE_CF_ISA_A);
 117     m68k_set_feature(env, M68K_FEATURE_CF_ISA_B);
 118     m68k_set_feature(env, M68K_FEATURE_BRAL);
 119     m68k_set_feature(env, M68K_FEATURE_CF_FPU);
 120     m68k_set_feature(env, M68K_FEATURE_CF_EMAC);
 121     m68k_set_feature(env, M68K_FEATURE_USP);
 122 }
 123
 124 static void any_cpu_initfn(Object *obj)
 125 {
 126     M68kCPU *cpu = M68K_CPU(obj);
 127     CPUM68KState *env = &cpu->env;
 128
 129     m68k_set_feature(env, M68K_FEATURE_CF_ISA_A);
 130     m68k_set_feature(env, M68K_FEATURE_CF_ISA_B);
 131     m68k_set_feature(env, M68K_FEATURE_CF_ISA_APLUSC);
 132     m68k_set_feature(env, M68K_FEATURE_BRAL);
 133     m68k_set_feature(env, M68K_FEATURE_CF_FPU);
 134     /* MAC and EMAC are mututally exclusive, so pick EMAC.
 135        It's mostly backwards compatible.  */
 136     m68k_set_feature(env, M68K_FEATURE_CF_EMAC);
 137     m68k_set_feature(env, M68K_FEATURE_CF_EMAC_B);
 138     m68k_set_feature(env, M68K_FEATURE_USP);
 139     m68k_set_feature(env, M68K_FEATURE_EXT_FULL);
 140     m68k_set_feature(env, M68K_FEATURE_WORD_INDEX);
 141 }
 142
 143 typedef struct M68kCPUInfo {
 144     const char *name;
 145     void (*instance_init)(Object *obj);
 146 } M68kCPUInfo;
 147
 148 static const M68kCPUInfo m68k_cpus[] = {
 149     { .name = "m5206", .instance_init = m5206_cpu_initfn },
 150     { .name = "m5208", .instance_init = m5208_cpu_initfn },
 151     { .name = "cfv4e", .instance_init = cfv4e_cpu_initfn },
 152     { .name = "any",   .instance_init = any_cpu_initfn },
 153 };
 154
 155 static void m68k_cpu_realizefn(DeviceState *dev, Error **errp)
 156 {
 157     CPUState *cs = CPU(dev);
 158     M68kCPU *cpu = M68K_CPU(dev);
 159     M68kCPUClass *mcc = M68K_CPU_GET_CLASS(dev);
 160
 161     m68k_cpu_init_gdb(cpu);
 162
 163     cpu_reset(cs);
 164     qemu_init_vcpu(cs);
 165
 166     mcc->parent_realize(dev, errp);
 167 }
 168
 169 static void m68k_cpu_initfn(Object *obj)
 170 {
 171     CPUState *cs = CPU(obj);
 172     M68kCPU *cpu = M68K_CPU(obj);
 173     CPUM68KState *env = &cpu->env;
 174     static bool inited;
 175
 176     cs->env_ptr = env;
 177     cpu_exec_init(cs, &error_abort);
 178
 179     if (tcg_enabled() && !inited) {
 180         inited = true;
 181         m68k_tcg_init();
 182     }
 183 }
 184
 185 static const VMStateDescription vmstate_m68k_cpu = {
 186     .name = "cpu",
 187     .unmigratable = 1,
 188 };
 189
 190 static void m68k_cpu_class_init(ObjectClass *c, void *data)
 191 {
 192     M68kCPUClass *mcc = M68K_CPU_CLASS(c);
 193     CPUClass *cc = CPU_CLASS(c);
 194     DeviceClass *dc = DEVICE_CLASS(c);
 195
 196     mcc->parent_realize = dc->realize;
 197     dc->realize = m68k_cpu_realizefn;
 198
 199     mcc->parent_reset = cc->reset;
 200     cc->reset = m68k_cpu_reset;
 201
 202     cc->class_by_name = m68k_cpu_class_by_name;
 203     cc->has_work = m68k_cpu_has_work;
 204     cc->do_interrupt = m68k_cpu_do_interrupt;
 205     cc->cpu_exec_interrupt = m68k_cpu_exec_interrupt;
 206     cc->dump_state = m68k_cpu_dump_state;
 207     cc->set_pc = m68k_cpu_set_pc;
 208     cc->gdb_read_register = m68k_cpu_gdb_read_register;
 209     cc->gdb_write_register = m68k_cpu_gdb_write_register;
 210 #ifdef CONFIG_USER_ONLY
 211     cc->handle_mmu_fault = m68k_cpu_handle_mmu_fault;
 212 #else
 213     cc->get_phys_page_debug = m68k_cpu_get_phys_page_debug;
 214 #endif
 215     cc->cpu_exec_enter = m68k_cpu_exec_enter;
 216     cc->cpu_exec_exit = m68k_cpu_exec_exit;
 217     cc->disas_set_info = m68k_cpu_disas_set_info;
 218
 219     cc->gdb_num_core_regs = 18;
 220     cc->gdb_core_xml_file = "cf-core.xml";
 221
 222     dc->vmsd = &vmstate_m68k_cpu;
 223
 224     /*
 225      * Reason: m68k_cpu_initfn() calls cpu_exec_init(), which saves
 226      * the object in cpus -> dangling pointer after final
 227      * object_unref().
 228      */
 229     dc->cannot_destroy_with_object_finalize_yet = true;
 230 }
 231
 232 static void register_cpu_type(const M68kCPUInfo *info)
 233 {
 234     TypeInfo type_info = {
 235         .parent = TYPE_M68K_CPU,
 236         .instance_init = info->instance_init,
 237     };
 238
 239     type_info.name = g_strdup_printf("%s-" TYPE_M68K_CPU, info->name);
 240     type_register(&type_info);
 241     g_free((void *)type_info.name);
 242 }
 243
 244 static const TypeInfo m68k_cpu_type_info = {
 245     .name = TYPE_M68K_CPU,
 246     .parent = TYPE_CPU,
 247     .instance_size = sizeof(M68kCPU),
 248     .instance_init = m68k_cpu_initfn,
 249     .abstract = true,
 250     .class_size = sizeof(M68kCPUClass),
 251     .class_init = m68k_cpu_class_init,
 252 };
 253
 254 static void m68k_cpu_register_types(void)
 255 {
 256     int i;
 257
 258     type_register_static(&m68k_cpu_type_info);
 259     for (i = 0; i < ARRAY_SIZE(m68k_cpus); i++) {
 260         register_cpu_type(&m68k_cpus[i]);
 261     }
 262 }
 263
 264 type_init(m68k_cpu_register_types)