target/sh4/cpu.c

   1 /*
   2  * QEMU SuperH CPU
   3  *
   4  * Copyright (c) 2005 Samuel Tardieu
   5  * Copyright (c) 2012 SUSE LINUX Products GmbH
   6  *
   7  * This library is free software; you can redistribute it and/or
   8  * modify it under the terms of the GNU Lesser General Public
   9  * License as published by the Free Software Foundation; either
  10  * version 2.1 of the License, or (at your option) any later version.
  11  *
  12  * This library is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  * Lesser General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU Lesser General Public
  18  * License along with this library; if not, see
  19  * <http://www.gnu.org/licenses/lgpl-2.1.html>
  20  */
  21
  22 #include "qemu/osdep.h"
  23 #include "qapi/error.h"
  24 #include "qemu/qemu-print.h"
  25 #include "cpu.h"
  26 #include "migration/vmstate.h"
  27 #include "exec/exec-all.h"
  28 #include "fpu/softfloat-helpers.h"
  29 #include "tcg/tcg.h"
  30
  31 static void superh_cpu_set_pc(CPUState *cs, vaddr value)
  32 {
  33     SuperHCPU *cpu = SUPERH_CPU(cs);
  34
  35     cpu->env.pc = value;
  36 }
  37
  38 static vaddr superh_cpu_get_pc(CPUState *cs)
  39 {
  40     SuperHCPU *cpu = SUPERH_CPU(cs);
  41
  42     return cpu->env.pc;
  43 }
  44
  45 static void superh_cpu_synchronize_from_tb(CPUState *cs,
  46                                            const TranslationBlock *tb)
  47 {
  48     SuperHCPU *cpu = SUPERH_CPU(cs);
  49
  50     tcg_debug_assert(!(cs->tcg_cflags & CF_PCREL));
  51     cpu->env.pc = tb->pc;
  52     cpu->env.flags = tb->flags & TB_FLAG_ENVFLAGS_MASK;
  53 }
  54
  55 static void superh_restore_state_to_opc(CPUState *cs,
  56                                         const TranslationBlock *tb,
  57                                         const uint64_t *data)
  58 {
  59     SuperHCPU *cpu = SUPERH_CPU(cs);
  60
  61     cpu->env.pc = data[0];
  62     cpu->env.flags = data[1];
  63     /*
  64      * Theoretically delayed_pc should also be restored. In practice the
  65      * branch instruction is re-executed after exception, so the delayed
  66      * branch target will be recomputed.
  67      */
  68 }
  69
  70 #ifndef CONFIG_USER_ONLY
  71 static bool superh_io_recompile_replay_branch(CPUState *cs,
  72                                               const TranslationBlock *tb)
  73 {
  74     SuperHCPU *cpu = SUPERH_CPU(cs);
  75     CPUSH4State *env = &cpu->env;
  76
  77     if ((env->flags & (TB_FLAG_DELAY_SLOT | TB_FLAG_DELAY_SLOT_COND))
  78         && !(cs->tcg_cflags & CF_PCREL) && env->pc != tb->pc) {
  79         env->pc -= 2;
  80         env->flags &= ~(TB_FLAG_DELAY_SLOT | TB_FLAG_DELAY_SLOT_COND);
  81         return true;
  82     }
  83     return false;
  84 }
  85 #endif
  86
  87 static bool superh_cpu_has_work(CPUState *cs)
  88 {
  89     return cs->interrupt_request & CPU_INTERRUPT_HARD;
  90 }
  91
  92 static void superh_cpu_reset_hold(Object *obj)
  93 {
  94     CPUState *s = CPU(obj);
  95     SuperHCPU *cpu = SUPERH_CPU(s);
  96     SuperHCPUClass *scc = SUPERH_CPU_GET_CLASS(cpu);
  97     CPUSH4State *env = &cpu->env;
  98
  99     if (scc->parent_phases.hold) {
 100         scc->parent_phases.hold(obj);
 101     }
 102
 103     memset(env, 0, offsetof(CPUSH4State, end_reset_fields));
 104
 105     env->pc = 0xA0000000;
 106 #if defined(CONFIG_USER_ONLY)
 107     env->fpscr = FPSCR_PR; /* value for userspace according to the kernel */
 108     set_float_rounding_mode(float_round_nearest_even, &env->fp_status); /* ?! */
 109 #else
 110     env->sr = (1u << SR_MD) | (1u << SR_RB) | (1u << SR_BL) |
 111               (1u << SR_I3) | (1u << SR_I2) | (1u << SR_I1) | (1u << SR_I0);
 112     env->fpscr = FPSCR_DN | FPSCR_RM_ZERO; /* CPU reset value according to SH4 manual */
 113     set_float_rounding_mode(float_round_to_zero, &env->fp_status);
 114     set_flush_to_zero(1, &env->fp_status);
 115 #endif
 116     set_default_nan_mode(1, &env->fp_status);
 117 }
 118
 119 static void superh_cpu_disas_set_info(CPUState *cpu, disassemble_info *info)
 120 {
 121     info->mach = bfd_mach_sh4;
 122     info->print_insn = print_insn_sh;
 123 }
 124
 125 static void superh_cpu_list_entry(gpointer data, gpointer user_data)
 126 {
 127     const char *typename = object_class_get_name(OBJECT_CLASS(data));
 128     int len = strlen(typename) - strlen(SUPERH_CPU_TYPE_SUFFIX);
 129
 130     qemu_printf("%.*s\n", len, typename);
 131 }
 132
 133 void sh4_cpu_list(void)
 134 {
 135     GSList *list;
 136
 137     list = object_class_get_list_sorted(TYPE_SUPERH_CPU, false);
 138     g_slist_foreach(list, superh_cpu_list_entry, NULL);
 139     g_slist_free(list);
 140 }
 141
 142 static ObjectClass *superh_cpu_class_by_name(const char *cpu_model)
 143 {
 144     ObjectClass *oc;
 145     char *s, *typename = NULL;
 146
 147     s = g_ascii_strdown(cpu_model, -1);
 148     if (strcmp(s, "any") == 0) {
 149         oc = object_class_by_name(TYPE_SH7750R_CPU);
 150         goto out;
 151     }
 152
 153     typename = g_strdup_printf(SUPERH_CPU_TYPE_NAME("%s"), s);
 154     oc = object_class_by_name(typename);
 155     if (oc != NULL && object_class_is_abstract(oc)) {
 156         oc = NULL;
 157     }
 158
 159 out:
 160     g_free(s);
 161     g_free(typename);
 162     return oc;
 163 }
 164
 165 static void sh7750r_cpu_initfn(Object *obj)
 166 {
 167     SuperHCPU *cpu = SUPERH_CPU(obj);
 168     CPUSH4State *env = &cpu->env;
 169
 170     env->id = SH_CPU_SH7750R;
 171     env->features = SH_FEATURE_BCR3_AND_BCR4;
 172 }
 173
 174 static void sh7750r_class_init(ObjectClass *oc, void *data)
 175 {
 176     SuperHCPUClass *scc = SUPERH_CPU_CLASS(oc);
 177
 178     scc->pvr = 0x00050000;
 179     scc->prr = 0x00000100;
 180     scc->cvr = 0x00110000;
 181 }
 182
 183 static void sh7751r_cpu_initfn(Object *obj)
 184 {
 185     SuperHCPU *cpu = SUPERH_CPU(obj);
 186     CPUSH4State *env = &cpu->env;
 187
 188     env->id = SH_CPU_SH7751R;
 189     env->features = SH_FEATURE_BCR3_AND_BCR4;
 190 }
 191
 192 static void sh7751r_class_init(ObjectClass *oc, void *data)
 193 {
 194     SuperHCPUClass *scc = SUPERH_CPU_CLASS(oc);
 195
 196     scc->pvr = 0x04050005;
 197     scc->prr = 0x00000113;
 198     scc->cvr = 0x00110000; /* Neutered caches, should be 0x20480000 */
 199 }
 200
 201 static void sh7785_cpu_initfn(Object *obj)
 202 {
 203     SuperHCPU *cpu = SUPERH_CPU(obj);
 204     CPUSH4State *env = &cpu->env;
 205
 206     env->id = SH_CPU_SH7785;
 207     env->features = SH_FEATURE_SH4A;
 208 }
 209
 210 static void sh7785_class_init(ObjectClass *oc, void *data)
 211 {
 212     SuperHCPUClass *scc = SUPERH_CPU_CLASS(oc);
 213
 214     scc->pvr = 0x10300700;
 215     scc->prr = 0x00000200;
 216     scc->cvr = 0x71440211;
 217 }
 218
 219 static void superh_cpu_realizefn(DeviceState *dev, Error **errp)
 220 {
 221     CPUState *cs = CPU(dev);
 222     SuperHCPUClass *scc = SUPERH_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     cpu_reset(cs);
 232     qemu_init_vcpu(cs);
 233
 234     scc->parent_realize(dev, errp);
 235 }
 236
 237 static void superh_cpu_initfn(Object *obj)
 238 {
 239     SuperHCPU *cpu = SUPERH_CPU(obj);
 240     CPUSH4State *env = &cpu->env;
 241
 242     cpu_set_cpustate_pointers(cpu);
 243
 244     env->movcal_backup_tail = &(env->movcal_backup);
 245 }
 246
 247 #ifndef CONFIG_USER_ONLY
 248 static const VMStateDescription vmstate_sh_cpu = {
 249     .name = "cpu",
 250     .unmigratable = 1,
 251 };
 252
 253 #include "hw/core/sysemu-cpu-ops.h"
 254
 255 static const struct SysemuCPUOps sh4_sysemu_ops = {
 256     .get_phys_page_debug = superh_cpu_get_phys_page_debug,
 257 };
 258 #endif
 259
 260 #include "hw/core/tcg-cpu-ops.h"
 261
 262 static const struct TCGCPUOps superh_tcg_ops = {
 263     .initialize = sh4_translate_init,
 264     .synchronize_from_tb = superh_cpu_synchronize_from_tb,
 265     .restore_state_to_opc = superh_restore_state_to_opc,
 266
 267 #ifndef CONFIG_USER_ONLY
 268     .tlb_fill = superh_cpu_tlb_fill,
 269     .cpu_exec_interrupt = superh_cpu_exec_interrupt,
 270     .do_interrupt = superh_cpu_do_interrupt,
 271     .do_unaligned_access = superh_cpu_do_unaligned_access,
 272     .io_recompile_replay_branch = superh_io_recompile_replay_branch,
 273 #endif /* !CONFIG_USER_ONLY */
 274 };
 275
 276 static void superh_cpu_class_init(ObjectClass *oc, void *data)
 277 {
 278     DeviceClass *dc = DEVICE_CLASS(oc);
 279     CPUClass *cc = CPU_CLASS(oc);
 280     SuperHCPUClass *scc = SUPERH_CPU_CLASS(oc);
 281     ResettableClass *rc = RESETTABLE_CLASS(oc);
 282
 283     device_class_set_parent_realize(dc, superh_cpu_realizefn,
 284                                     &scc->parent_realize);
 285
 286     resettable_class_set_parent_phases(rc, NULL, superh_cpu_reset_hold, NULL,
 287                                        &scc->parent_phases);
 288
 289     cc->class_by_name = superh_cpu_class_by_name;
 290     cc->has_work = superh_cpu_has_work;
 291     cc->dump_state = superh_cpu_dump_state;
 292     cc->set_pc = superh_cpu_set_pc;
 293     cc->get_pc = superh_cpu_get_pc;
 294     cc->gdb_read_register = superh_cpu_gdb_read_register;
 295     cc->gdb_write_register = superh_cpu_gdb_write_register;
 296 #ifndef CONFIG_USER_ONLY
 297     cc->sysemu_ops = &sh4_sysemu_ops;
 298     dc->vmsd = &vmstate_sh_cpu;
 299 #endif
 300     cc->disas_set_info = superh_cpu_disas_set_info;
 301
 302     cc->gdb_num_core_regs = 59;
 303     cc->tcg_ops = &superh_tcg_ops;
 304 }
 305
 306 #define DEFINE_SUPERH_CPU_TYPE(type_name, cinit, initfn) \
 307     {                                                    \
 308         .name = type_name,                               \
 309         .parent = TYPE_SUPERH_CPU,                       \
 310         .class_init = cinit,                             \
 311         .instance_init = initfn,                         \
 312     }
 313 static const TypeInfo superh_cpu_type_infos[] = {
 314     {
 315         .name = TYPE_SUPERH_CPU,
 316         .parent = TYPE_CPU,
 317         .instance_size = sizeof(SuperHCPU),
 318         .instance_init = superh_cpu_initfn,
 319         .abstract = true,
 320         .class_size = sizeof(SuperHCPUClass),
 321         .class_init = superh_cpu_class_init,
 322     },
 323     DEFINE_SUPERH_CPU_TYPE(TYPE_SH7750R_CPU, sh7750r_class_init,
 324                            sh7750r_cpu_initfn),
 325     DEFINE_SUPERH_CPU_TYPE(TYPE_SH7751R_CPU, sh7751r_class_init,
 326                            sh7751r_cpu_initfn),
 327     DEFINE_SUPERH_CPU_TYPE(TYPE_SH7785_CPU, sh7785_class_init,
 328                            sh7785_cpu_initfn),
 329
 330 };
 331
 332 DEFINE_TYPES(superh_cpu_type_infos)