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
  27
  28 static void m68k_cpu_set_pc(CPUState *cs, vaddr value)
  29 {
  30     M68kCPU *cpu = M68K_CPU(cs);
  31
  32     cpu->env.pc = value;
  33 }
  34
  35 static bool m68k_cpu_has_work(CPUState *cs)
  36 {
  37     return cs->interrupt_request & CPU_INTERRUPT_HARD;
  38 }
  39
  40 static void m68k_set_feature(CPUM68KState *env, int feature)
  41 {
  42     env->features |= (1u << feature);
  43 }
  44
  45 /* CPUClass::reset() */
  46 static void m68k_cpu_reset(CPUState *s)
  47 {
  48     M68kCPU *cpu = M68K_CPU(s);
  49     M68kCPUClass *mcc = M68K_CPU_GET_CLASS(cpu);
  50     CPUM68KState *env = &cpu->env;
  51
  52     mcc->parent_reset(s);
  53
  54     memset(env, 0, offsetof(CPUM68KState, features));
  55 #if !defined(CONFIG_USER_ONLY)
  56     env->sr = 0x2700;
  57 #endif
  58     m68k_switch_sp(env);
  59     /* ??? FP regs should be initialized to NaN.  */
  60     env->cc_op = CC_OP_FLAGS;
  61     /* TODO: We should set PC from the interrupt vector.  */
  62     env->pc = 0;
  63     tlb_flush(s, 1);
  64 }
  65
  66 static void m68k_cpu_disas_set_info(CPUState *cpu, disassemble_info *info)
  67 {
  68     info->print_insn = print_insn_m68k;
  69 }
  70
  71 /* CPU models */
  72
  73 static ObjectClass *m68k_cpu_class_by_name(const char *cpu_model)
  74 {
  75     ObjectClass *oc;
  76     char *typename;
  77
  78     if (cpu_model == NULL) {
  79         return NULL;
  80     }
  81
  82     typename = g_strdup_printf("%s-" TYPE_M68K_CPU, cpu_model);
  83     oc = object_class_by_name(typename);
  84     g_free(typename);
  85     if (oc != NULL && (object_class_dynamic_cast(oc, TYPE_M68K_CPU) == NULL ||
  86                        object_class_is_abstract(oc))) {
  87         return NULL;
  88     }
  89     return oc;
  90 }
  91
  92 static void m5206_cpu_initfn(Object *obj)
  93 {
  94     M68kCPU *cpu = M68K_CPU(obj);
  95     CPUM68KState *env = &cpu->env;
  96
  97     m68k_set_feature(env, M68K_FEATURE_CF_ISA_A);
  98 }
  99
 100 static void m5208_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     m68k_set_feature(env, M68K_FEATURE_CF_ISA_APLUSC);
 107     m68k_set_feature(env, M68K_FEATURE_BRAL);
 108     m68k_set_feature(env, M68K_FEATURE_CF_EMAC);
 109     m68k_set_feature(env, M68K_FEATURE_USP);
 110 }
 111
 112 static void cfv4e_cpu_initfn(Object *obj)
 113 {
 114     M68kCPU *cpu = M68K_CPU(obj);
 115     CPUM68KState *env = &cpu->env;
 116
 117     m68k_set_feature(env, M68K_FEATURE_CF_ISA_A);
 118     m68k_set_feature(env, M68K_FEATURE_CF_ISA_B);
 119     m68k_set_feature(env, M68K_FEATURE_BRAL);
 120     m68k_set_feature(env, M68K_FEATURE_CF_FPU);
 121     m68k_set_feature(env, M68K_FEATURE_CF_EMAC);
 122     m68k_set_feature(env, M68K_FEATURE_USP);
 123 }
 124
 125 static void any_cpu_initfn(Object *obj)
 126 {
 127     M68kCPU *cpu = M68K_CPU(obj);
 128     CPUM68KState *env = &cpu->env;
 129
 130     m68k_set_feature(env, M68K_FEATURE_CF_ISA_A);
 131     m68k_set_feature(env, M68K_FEATURE_CF_ISA_B);
 132     m68k_set_feature(env, M68K_FEATURE_CF_ISA_APLUSC);
 133     m68k_set_feature(env, M68K_FEATURE_BRAL);
 134     m68k_set_feature(env, M68K_FEATURE_CF_FPU);
 135     /* MAC and EMAC are mututally exclusive, so pick EMAC.
 136        It's mostly backwards compatible.  */
 137     m68k_set_feature(env, M68K_FEATURE_CF_EMAC);
 138     m68k_set_feature(env, M68K_FEATURE_CF_EMAC_B);
 139     m68k_set_feature(env, M68K_FEATURE_USP);
 140     m68k_set_feature(env, M68K_FEATURE_EXT_FULL);
 141     m68k_set_feature(env, M68K_FEATURE_WORD_INDEX);
 142 }
 143
 144 typedef struct M68kCPUInfo {
 145     const char *name;
 146     void (*instance_init)(Object *obj);
 147 } M68kCPUInfo;
 148
 149 static const M68kCPUInfo m68k_cpus[] = {
 150     { .name = "m5206", .instance_init = m5206_cpu_initfn },
 151     { .name = "m5208", .instance_init = m5208_cpu_initfn },
 152     { .name = "cfv4e", .instance_init = cfv4e_cpu_initfn },
 153     { .name = "any",   .instance_init = any_cpu_initfn },
 154 };
 155
 156 static void m68k_cpu_realizefn(DeviceState *dev, Error **errp)
 157 {
 158     CPUState *cs = CPU(dev);
 159     M68kCPU *cpu = M68K_CPU(dev);
 160     M68kCPUClass *mcc = M68K_CPU_GET_CLASS(dev);
 161
 162     m68k_cpu_init_gdb(cpu);
 163
 164     cpu_reset(cs);
 165     qemu_init_vcpu(cs);
 166
 167     mcc->parent_realize(dev, errp);
 168 }
 169
 170 static void m68k_cpu_initfn(Object *obj)
 171 {
 172     CPUState *cs = CPU(obj);
 173     M68kCPU *cpu = M68K_CPU(obj);
 174     CPUM68KState *env = &cpu->env;
 175     static bool inited;
 176
 177     cs->env_ptr = env;
 178     cpu_exec_init(cs, &error_abort);
 179
 180     if (tcg_enabled() && !inited) {
 181         inited = true;
 182         m68k_tcg_init();
 183     }
 184 }
 185
 186 static const VMStateDescription vmstate_m68k_cpu = {
 187     .name = "cpu",
 188     .unmigratable = 1,
 189 };
 190
 191 static void m68k_cpu_class_init(ObjectClass *c, void *data)
 192 {
 193     M68kCPUClass *mcc = M68K_CPU_CLASS(c);
 194     CPUClass *cc = CPU_CLASS(c);
 195     DeviceClass *dc = DEVICE_CLASS(c);
 196
 197     mcc->parent_realize = dc->realize;
 198     dc->realize = m68k_cpu_realizefn;
 199
 200     mcc->parent_reset = cc->reset;
 201     cc->reset = m68k_cpu_reset;
 202
 203     cc->class_by_name = m68k_cpu_class_by_name;
 204     cc->has_work = m68k_cpu_has_work;
 205     cc->do_interrupt = m68k_cpu_do_interrupt;
 206     cc->cpu_exec_interrupt = m68k_cpu_exec_interrupt;
 207     cc->dump_state = m68k_cpu_dump_state;
 208     cc->set_pc = m68k_cpu_set_pc;
 209     cc->gdb_read_register = m68k_cpu_gdb_read_register;
 210     cc->gdb_write_register = m68k_cpu_gdb_write_register;
 211 #ifdef CONFIG_USER_ONLY
 212     cc->handle_mmu_fault = m68k_cpu_handle_mmu_fault;
 213 #else
 214     cc->get_phys_page_debug = m68k_cpu_get_phys_page_debug;
 215 #endif
 216     cc->cpu_exec_enter = m68k_cpu_exec_enter;
 217     cc->cpu_exec_exit = m68k_cpu_exec_exit;
 218     cc->disas_set_info = m68k_cpu_disas_set_info;
 219
 220     cc->gdb_num_core_regs = 18;
 221     cc->gdb_core_xml_file = "cf-core.xml";
 222
 223     dc->vmsd = &vmstate_m68k_cpu;
 224
 225     /*
 226      * Reason: m68k_cpu_initfn() calls cpu_exec_init(), which saves
 227      * the object in cpus -> dangling pointer after final
 228      * object_unref().
 229      */
 230     dc->cannot_destroy_with_object_finalize_yet = true;
 231 }
 232
 233 static void register_cpu_type(const M68kCPUInfo *info)
 234 {
 235     TypeInfo type_info = {
 236         .parent = TYPE_M68K_CPU,
 237         .instance_init = info->instance_init,
 238     };
 239
 240     type_info.name = g_strdup_printf("%s-" TYPE_M68K_CPU, info->name);
 241     type_register(&type_info);
 242     g_free((void *)type_info.name);
 243 }
 244
 245 static const TypeInfo m68k_cpu_type_info = {
 246     .name = TYPE_M68K_CPU,
 247     .parent = TYPE_CPU,
 248     .instance_size = sizeof(M68kCPU),
 249     .instance_init = m68k_cpu_initfn,
 250     .abstract = true,
 251     .class_size = sizeof(M68kCPUClass),
 252     .class_init = m68k_cpu_class_init,
 253 };
 254
 255 static void m68k_cpu_register_types(void)
 256 {
 257     int i;
 258
 259     type_register_static(&m68k_cpu_type_info);
 260     for (i = 0; i < ARRAY_SIZE(m68k_cpus); i++) {
 261         register_cpu_type(&m68k_cpus[i]);
 262     }
 263 }
 264
 265 type_init(m68k_cpu_register_types)