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 #include "exec/exec-all.h"
  27
  28
  29 static void m68k_cpu_set_pc(CPUState *cs, vaddr value)
  30 {
  31     M68kCPU *cpu = M68K_CPU(cs);
  32
  33     cpu->env.pc = value;
  34 }
  35
  36 static bool m68k_cpu_has_work(CPUState *cs)
  37 {
  38     return cs->interrupt_request & CPU_INTERRUPT_HARD;
  39 }
  40
  41 static void m68k_set_feature(CPUM68KState *env, int feature)
  42 {
  43     env->features |= (1u << feature);
  44 }
  45
  46 /* CPUClass::reset() */
  47 static 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     env->cc_op = CC_OP_FLAGS;
  62     /* TODO: We should set PC from the interrupt vector.  */
  63     env->pc = 0;
  64     tlb_flush(s, 1);
  65 }
  66
  67 static void m68k_cpu_disas_set_info(CPUState *cpu, disassemble_info *info)
  68 {
  69     info->print_insn = print_insn_m68k;
  70 }
  71
  72 /* CPU models */
  73
  74 static ObjectClass *m68k_cpu_class_by_name(const char *cpu_model)
  75 {
  76     ObjectClass *oc;
  77     char *typename;
  78
  79     if (cpu_model == NULL) {
  80         return NULL;
  81     }
  82
  83     typename = g_strdup_printf("%s-" TYPE_M68K_CPU, cpu_model);
  84     oc = object_class_by_name(typename);
  85     g_free(typename);
  86     if (oc != NULL && (object_class_dynamic_cast(oc, TYPE_M68K_CPU) == NULL ||
  87                        object_class_is_abstract(oc))) {
  88         return NULL;
  89     }
  90     return oc;
  91 }
  92
  93 static void m5206_cpu_initfn(Object *obj)
  94 {
  95     M68kCPU *cpu = M68K_CPU(obj);
  96     CPUM68KState *env = &cpu->env;
  97
  98     m68k_set_feature(env, M68K_FEATURE_CF_ISA_A);
  99 }
 100
 101 static void m5208_cpu_initfn(Object *obj)
 102 {
 103     M68kCPU *cpu = M68K_CPU(obj);
 104     CPUM68KState *env = &cpu->env;
 105
 106     m68k_set_feature(env, M68K_FEATURE_CF_ISA_A);
 107     m68k_set_feature(env, M68K_FEATURE_CF_ISA_APLUSC);
 108     m68k_set_feature(env, M68K_FEATURE_BRAL);
 109     m68k_set_feature(env, M68K_FEATURE_CF_EMAC);
 110     m68k_set_feature(env, M68K_FEATURE_USP);
 111 }
 112
 113 static void cfv4e_cpu_initfn(Object *obj)
 114 {
 115     M68kCPU *cpu = M68K_CPU(obj);
 116     CPUM68KState *env = &cpu->env;
 117
 118     m68k_set_feature(env, M68K_FEATURE_CF_ISA_A);
 119     m68k_set_feature(env, M68K_FEATURE_CF_ISA_B);
 120     m68k_set_feature(env, M68K_FEATURE_BRAL);
 121     m68k_set_feature(env, M68K_FEATURE_CF_FPU);
 122     m68k_set_feature(env, M68K_FEATURE_CF_EMAC);
 123     m68k_set_feature(env, M68K_FEATURE_USP);
 124 }
 125
 126 static void any_cpu_initfn(Object *obj)
 127 {
 128     M68kCPU *cpu = M68K_CPU(obj);
 129     CPUM68KState *env = &cpu->env;
 130
 131     m68k_set_feature(env, M68K_FEATURE_CF_ISA_A);
 132     m68k_set_feature(env, M68K_FEATURE_CF_ISA_B);
 133     m68k_set_feature(env, M68K_FEATURE_CF_ISA_APLUSC);
 134     m68k_set_feature(env, M68K_FEATURE_BRAL);
 135     m68k_set_feature(env, M68K_FEATURE_CF_FPU);
 136     /* MAC and EMAC are mututally exclusive, so pick EMAC.
 137        It's mostly backwards compatible.  */
 138     m68k_set_feature(env, M68K_FEATURE_CF_EMAC);
 139     m68k_set_feature(env, M68K_FEATURE_CF_EMAC_B);
 140     m68k_set_feature(env, M68K_FEATURE_USP);
 141     m68k_set_feature(env, M68K_FEATURE_EXT_FULL);
 142     m68k_set_feature(env, M68K_FEATURE_WORD_INDEX);
 143 }
 144
 145 typedef struct M68kCPUInfo {
 146     const char *name;
 147     void (*instance_init)(Object *obj);
 148 } M68kCPUInfo;
 149
 150 static const M68kCPUInfo m68k_cpus[] = {
 151     { .name = "m5206", .instance_init = m5206_cpu_initfn },
 152     { .name = "m5208", .instance_init = m5208_cpu_initfn },
 153     { .name = "cfv4e", .instance_init = cfv4e_cpu_initfn },
 154     { .name = "any",   .instance_init = any_cpu_initfn },
 155 };
 156
 157 static void m68k_cpu_realizefn(DeviceState *dev, Error **errp)
 158 {
 159     CPUState *cs = CPU(dev);
 160     M68kCPU *cpu = M68K_CPU(dev);
 161     M68kCPUClass *mcc = M68K_CPU_GET_CLASS(dev);
 162
 163     m68k_cpu_init_gdb(cpu);
 164
 165     cpu_reset(cs);
 166     qemu_init_vcpu(cs);
 167
 168     mcc->parent_realize(dev, errp);
 169 }
 170
 171 static void m68k_cpu_initfn(Object *obj)
 172 {
 173     CPUState *cs = CPU(obj);
 174     M68kCPU *cpu = M68K_CPU(obj);
 175     CPUM68KState *env = &cpu->env;
 176     static bool inited;
 177
 178     cs->env_ptr = env;
 179     cpu_exec_init(cs, &error_abort);
 180
 181     if (tcg_enabled() && !inited) {
 182         inited = true;
 183         m68k_tcg_init();
 184     }
 185 }
 186
 187 static const VMStateDescription vmstate_m68k_cpu = {
 188     .name = "cpu",
 189     .unmigratable = 1,
 190 };
 191
 192 static void m68k_cpu_class_init(ObjectClass *c, void *data)
 193 {
 194     M68kCPUClass *mcc = M68K_CPU_CLASS(c);
 195     CPUClass *cc = CPU_CLASS(c);
 196     DeviceClass *dc = DEVICE_CLASS(c);
 197
 198     mcc->parent_realize = dc->realize;
 199     dc->realize = m68k_cpu_realizefn;
 200
 201     mcc->parent_reset = cc->reset;
 202     cc->reset = m68k_cpu_reset;
 203
 204     cc->class_by_name = m68k_cpu_class_by_name;
 205     cc->has_work = m68k_cpu_has_work;
 206     cc->do_interrupt = m68k_cpu_do_interrupt;
 207     cc->cpu_exec_interrupt = m68k_cpu_exec_interrupt;
 208     cc->dump_state = m68k_cpu_dump_state;
 209     cc->set_pc = m68k_cpu_set_pc;
 210     cc->gdb_read_register = m68k_cpu_gdb_read_register;
 211     cc->gdb_write_register = m68k_cpu_gdb_write_register;
 212 #ifdef CONFIG_USER_ONLY
 213     cc->handle_mmu_fault = m68k_cpu_handle_mmu_fault;
 214 #else
 215     cc->get_phys_page_debug = m68k_cpu_get_phys_page_debug;
 216 #endif
 217     cc->cpu_exec_enter = m68k_cpu_exec_enter;
 218     cc->cpu_exec_exit = m68k_cpu_exec_exit;
 219     cc->disas_set_info = m68k_cpu_disas_set_info;
 220
 221     cc->gdb_num_core_regs = 18;
 222     cc->gdb_core_xml_file = "cf-core.xml";
 223
 224     dc->vmsd = &vmstate_m68k_cpu;
 225
 226     /*
 227      * Reason: m68k_cpu_initfn() calls cpu_exec_init(), which saves
 228      * the object in cpus -> dangling pointer after final
 229      * object_unref().
 230      */
 231     dc->cannot_destroy_with_object_finalize_yet = true;
 232 }
 233
 234 static void register_cpu_type(const M68kCPUInfo *info)
 235 {
 236     TypeInfo type_info = {
 237         .parent = TYPE_M68K_CPU,
 238         .instance_init = info->instance_init,
 239     };
 240
 241     type_info.name = g_strdup_printf("%s-" TYPE_M68K_CPU, info->name);
 242     type_register(&type_info);
 243     g_free((void *)type_info.name);
 244 }
 245
 246 static const TypeInfo m68k_cpu_type_info = {
 247     .name = TYPE_M68K_CPU,
 248     .parent = TYPE_CPU,
 249     .instance_size = sizeof(M68kCPU),
 250     .instance_init = m68k_cpu_initfn,
 251     .abstract = true,
 252     .class_size = sizeof(M68kCPUClass),
 253     .class_init = m68k_cpu_class_init,
 254 };
 255
 256 static void m68k_cpu_register_types(void)
 257 {
 258     int i;
 259
 260     type_register_static(&m68k_cpu_type_info);
 261     for (i = 0; i < ARRAY_SIZE(m68k_cpus); i++) {
 262         register_cpu_type(&m68k_cpus[i]);
 263     }
 264 }
 265
 266 type_init(m68k_cpu_register_types)