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 "cpu.h"
  22 #include "qemu-common.h"
  23 #include "migration/vmstate.h"
  24
  25
  26 static void m68k_cpu_set_pc(CPUState *cs, vaddr value)
  27 {
  28     M68kCPU *cpu = M68K_CPU(cs);
  29
  30     cpu->env.pc = value;
  31 }
  32
  33 static bool m68k_cpu_has_work(CPUState *cs)
  34 {
  35     return cs->interrupt_request & CPU_INTERRUPT_HARD;
  36 }
  37
  38 static void m68k_set_feature(CPUM68KState *env, int feature)
  39 {
  40     env->features |= (1u << feature);
  41 }
  42
  43 /* CPUClass::reset() */
  44 static void m68k_cpu_reset(CPUState *s)
  45 {
  46     M68kCPU *cpu = M68K_CPU(s);
  47     M68kCPUClass *mcc = M68K_CPU_GET_CLASS(cpu);
  48     CPUM68KState *env = &cpu->env;
  49
  50     mcc->parent_reset(s);
  51
  52     memset(env, 0, offsetof(CPUM68KState, features));
  53 #if !defined(CONFIG_USER_ONLY)
  54     env->sr = 0x2700;
  55 #endif
  56     m68k_switch_sp(env);
  57     /* ??? FP regs should be initialized to NaN.  */
  58     env->cc_op = CC_OP_FLAGS;
  59     /* TODO: We should set PC from the interrupt vector.  */
  60     env->pc = 0;
  61     tlb_flush(s, 1);
  62 }
  63
  64 static void m68k_cpu_disas_set_info(CPUState *cpu, disassemble_info *info)
  65 {
  66     info->print_insn = print_insn_m68k;
  67 }
  68
  69 /* CPU models */
  70
  71 static ObjectClass *m68k_cpu_class_by_name(const char *cpu_model)
  72 {
  73     ObjectClass *oc;
  74     char *typename;
  75
  76     if (cpu_model == NULL) {
  77         return NULL;
  78     }
  79
  80     typename = g_strdup_printf("%s-" TYPE_M68K_CPU, cpu_model);
  81     oc = object_class_by_name(typename);
  82     g_free(typename);
  83     if (oc != NULL && (object_class_dynamic_cast(oc, TYPE_M68K_CPU) == NULL ||
  84                        object_class_is_abstract(oc))) {
  85         return NULL;
  86     }
  87     return oc;
  88 }
  89
  90 static void m5206_cpu_initfn(Object *obj)
  91 {
  92     M68kCPU *cpu = M68K_CPU(obj);
  93     CPUM68KState *env = &cpu->env;
  94
  95     m68k_set_feature(env, M68K_FEATURE_CF_ISA_A);
  96 }
  97
  98 static void m5208_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     m68k_set_feature(env, M68K_FEATURE_CF_ISA_APLUSC);
 105     m68k_set_feature(env, M68K_FEATURE_BRAL);
 106     m68k_set_feature(env, M68K_FEATURE_CF_EMAC);
 107     m68k_set_feature(env, M68K_FEATURE_USP);
 108 }
 109
 110 static void cfv4e_cpu_initfn(Object *obj)
 111 {
 112     M68kCPU *cpu = M68K_CPU(obj);
 113     CPUM68KState *env = &cpu->env;
 114
 115     m68k_set_feature(env, M68K_FEATURE_CF_ISA_A);
 116     m68k_set_feature(env, M68K_FEATURE_CF_ISA_B);
 117     m68k_set_feature(env, M68K_FEATURE_BRAL);
 118     m68k_set_feature(env, M68K_FEATURE_CF_FPU);
 119     m68k_set_feature(env, M68K_FEATURE_CF_EMAC);
 120     m68k_set_feature(env, M68K_FEATURE_USP);
 121 }
 122
 123 static void any_cpu_initfn(Object *obj)
 124 {
 125     M68kCPU *cpu = M68K_CPU(obj);
 126     CPUM68KState *env = &cpu->env;
 127
 128     m68k_set_feature(env, M68K_FEATURE_CF_ISA_A);
 129     m68k_set_feature(env, M68K_FEATURE_CF_ISA_B);
 130     m68k_set_feature(env, M68K_FEATURE_CF_ISA_APLUSC);
 131     m68k_set_feature(env, M68K_FEATURE_BRAL);
 132     m68k_set_feature(env, M68K_FEATURE_CF_FPU);
 133     /* MAC and EMAC are mututally exclusive, so pick EMAC.
 134        It's mostly backwards compatible.  */
 135     m68k_set_feature(env, M68K_FEATURE_CF_EMAC);
 136     m68k_set_feature(env, M68K_FEATURE_CF_EMAC_B);
 137     m68k_set_feature(env, M68K_FEATURE_USP);
 138     m68k_set_feature(env, M68K_FEATURE_EXT_FULL);
 139     m68k_set_feature(env, M68K_FEATURE_WORD_INDEX);
 140 }
 141
 142 typedef struct M68kCPUInfo {
 143     const char *name;
 144     void (*instance_init)(Object *obj);
 145 } M68kCPUInfo;
 146
 147 static const M68kCPUInfo m68k_cpus[] = {
 148     { .name = "m5206", .instance_init = m5206_cpu_initfn },
 149     { .name = "m5208", .instance_init = m5208_cpu_initfn },
 150     { .name = "cfv4e", .instance_init = cfv4e_cpu_initfn },
 151     { .name = "any",   .instance_init = any_cpu_initfn },
 152 };
 153
 154 static void m68k_cpu_realizefn(DeviceState *dev, Error **errp)
 155 {
 156     CPUState *cs = CPU(dev);
 157     M68kCPU *cpu = M68K_CPU(dev);
 158     M68kCPUClass *mcc = M68K_CPU_GET_CLASS(dev);
 159
 160     m68k_cpu_init_gdb(cpu);
 161
 162     cpu_reset(cs);
 163     qemu_init_vcpu(cs);
 164
 165     mcc->parent_realize(dev, errp);
 166 }
 167
 168 static void m68k_cpu_initfn(Object *obj)
 169 {
 170     CPUState *cs = CPU(obj);
 171     M68kCPU *cpu = M68K_CPU(obj);
 172     CPUM68KState *env = &cpu->env;
 173     static bool inited;
 174
 175     cs->env_ptr = env;
 176     cpu_exec_init(cs, &error_abort);
 177
 178     if (tcg_enabled() && !inited) {
 179         inited = true;
 180         m68k_tcg_init();
 181     }
 182 }
 183
 184 static const VMStateDescription vmstate_m68k_cpu = {
 185     .name = "cpu",
 186     .unmigratable = 1,
 187 };
 188
 189 static void m68k_cpu_class_init(ObjectClass *c, void *data)
 190 {
 191     M68kCPUClass *mcc = M68K_CPU_CLASS(c);
 192     CPUClass *cc = CPU_CLASS(c);
 193     DeviceClass *dc = DEVICE_CLASS(c);
 194
 195     mcc->parent_realize = dc->realize;
 196     dc->realize = m68k_cpu_realizefn;
 197
 198     mcc->parent_reset = cc->reset;
 199     cc->reset = m68k_cpu_reset;
 200
 201     cc->class_by_name = m68k_cpu_class_by_name;
 202     cc->has_work = m68k_cpu_has_work;
 203     cc->do_interrupt = m68k_cpu_do_interrupt;
 204     cc->cpu_exec_interrupt = m68k_cpu_exec_interrupt;
 205     cc->dump_state = m68k_cpu_dump_state;
 206     cc->set_pc = m68k_cpu_set_pc;
 207     cc->gdb_read_register = m68k_cpu_gdb_read_register;
 208     cc->gdb_write_register = m68k_cpu_gdb_write_register;
 209 #ifdef CONFIG_USER_ONLY
 210     cc->handle_mmu_fault = m68k_cpu_handle_mmu_fault;
 211 #else
 212     cc->get_phys_page_debug = m68k_cpu_get_phys_page_debug;
 213 #endif
 214     cc->cpu_exec_enter = m68k_cpu_exec_enter;
 215     cc->cpu_exec_exit = m68k_cpu_exec_exit;
 216     cc->disas_set_info = m68k_cpu_disas_set_info;
 217
 218     cc->gdb_num_core_regs = 18;
 219     cc->gdb_core_xml_file = "cf-core.xml";
 220
 221     dc->vmsd = &vmstate_m68k_cpu;
 222
 223     /*
 224      * Reason: m68k_cpu_initfn() calls cpu_exec_init(), which saves
 225      * the object in cpus -> dangling pointer after final
 226      * object_unref().
 227      */
 228     dc->cannot_destroy_with_object_finalize_yet = true;
 229 }
 230
 231 static void register_cpu_type(const M68kCPUInfo *info)
 232 {
 233     TypeInfo type_info = {
 234         .parent = TYPE_M68K_CPU,
 235         .instance_init = info->instance_init,
 236     };
 237
 238     type_info.name = g_strdup_printf("%s-" TYPE_M68K_CPU, info->name);
 239     type_register(&type_info);
 240     g_free((void *)type_info.name);
 241 }
 242
 243 static const TypeInfo m68k_cpu_type_info = {
 244     .name = TYPE_M68K_CPU,
 245     .parent = TYPE_CPU,
 246     .instance_size = sizeof(M68kCPU),
 247     .instance_init = m68k_cpu_initfn,
 248     .abstract = true,
 249     .class_size = sizeof(M68kCPUClass),
 250     .class_init = m68k_cpu_class_init,
 251 };
 252
 253 static void m68k_cpu_register_types(void)
 254 {
 255     int i;
 256
 257     type_register_static(&m68k_cpu_type_info);
 258     for (i = 0; i < ARRAY_SIZE(m68k_cpus); i++) {
 259         register_cpu_type(&m68k_cpus[i]);
 260     }
 261 }
 262
 263 type_init(m68k_cpu_register_types)