target/avr/cpu.c

   1 /*
   2  * QEMU AVR CPU
   3  *
   4  * Copyright (c) 2019-2020 Michael Rolnik
   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 "qemu/qemu-print.h"
  24 #include "exec/exec-all.h"
  25 #include "cpu.h"
  26 #include "disas/dis-asm.h"
  27 #include "tcg/debug-assert.h"
  28 #include "hw/qdev-properties.h"
  29
  30 static void avr_cpu_set_pc(CPUState *cs, vaddr value)
  31 {
  32     AVRCPU *cpu = AVR_CPU(cs);
  33
  34     cpu->env.pc_w = value / 2; /* internally PC points to words */
  35 }
  36
  37 static vaddr avr_cpu_get_pc(CPUState *cs)
  38 {
  39     AVRCPU *cpu = AVR_CPU(cs);
  40
  41     return cpu->env.pc_w * 2;
  42 }
  43
  44 static bool avr_cpu_has_work(CPUState *cs)
  45 {
  46     return (cs->interrupt_request & (CPU_INTERRUPT_HARD | CPU_INTERRUPT_RESET))
  47             && cpu_interrupts_enabled(cpu_env(cs));
  48 }
  49
  50 static int avr_cpu_mmu_index(CPUState *cs, bool ifetch)
  51 {
  52     return ifetch ? MMU_CODE_IDX : MMU_DATA_IDX;
  53 }
  54
  55 static void avr_cpu_synchronize_from_tb(CPUState *cs,
  56                                         const TranslationBlock *tb)
  57 {
  58     tcg_debug_assert(!(cs->tcg_cflags & CF_PCREL));
  59     cpu_env(cs)->pc_w = tb->pc / 2; /* internally PC points to words */
  60 }
  61
  62 static void avr_restore_state_to_opc(CPUState *cs,
  63                                      const TranslationBlock *tb,
  64                                      const uint64_t *data)
  65 {
  66     cpu_env(cs)->pc_w = data[0];
  67 }
  68
  69 static void avr_cpu_reset_hold(Object *obj)
  70 {
  71     CPUState *cs = CPU(obj);
  72     AVRCPU *cpu = AVR_CPU(cs);
  73     AVRCPUClass *mcc = AVR_CPU_GET_CLASS(obj);
  74     CPUAVRState *env = &cpu->env;
  75
  76     if (mcc->parent_phases.hold) {
  77         mcc->parent_phases.hold(obj);
  78     }
  79
  80     env->pc_w = 0;
  81     env->sregI = 1;
  82     env->sregC = 0;
  83     env->sregZ = 0;
  84     env->sregN = 0;
  85     env->sregV = 0;
  86     env->sregS = 0;
  87     env->sregH = 0;
  88     env->sregT = 0;
  89
  90     env->rampD = 0;
  91     env->rampX = 0;
  92     env->rampY = 0;
  93     env->rampZ = 0;
  94     env->eind = 0;
  95     env->sp = cpu->init_sp;
  96
  97     env->skip = 0;
  98
  99     memset(env->r, 0, sizeof(env->r));
 100 }
 101
 102 static void avr_cpu_disas_set_info(CPUState *cpu, disassemble_info *info)
 103 {
 104     info->mach = bfd_arch_avr;
 105     info->print_insn = avr_print_insn;
 106 }
 107
 108 static void avr_cpu_realizefn(DeviceState *dev, Error **errp)
 109 {
 110     CPUState *cs = CPU(dev);
 111     AVRCPUClass *mcc = AVR_CPU_GET_CLASS(dev);
 112     Error *local_err = NULL;
 113
 114     cpu_exec_realizefn(cs, &local_err);
 115     if (local_err != NULL) {
 116         error_propagate(errp, local_err);
 117         return;
 118     }
 119     qemu_init_vcpu(cs);
 120     cpu_reset(cs);
 121
 122     mcc->parent_realize(dev, errp);
 123 }
 124
 125 static void avr_cpu_set_int(void *opaque, int irq, int level)
 126 {
 127     AVRCPU *cpu = opaque;
 128     CPUAVRState *env = &cpu->env;
 129     CPUState *cs = CPU(cpu);
 130     uint64_t mask = (1ull << irq);
 131
 132     if (level) {
 133         env->intsrc |= mask;
 134         cpu_interrupt(cs, CPU_INTERRUPT_HARD);
 135     } else {
 136         env->intsrc &= ~mask;
 137         if (env->intsrc == 0) {
 138             cpu_reset_interrupt(cs, CPU_INTERRUPT_HARD);
 139         }
 140     }
 141 }
 142
 143 static void avr_cpu_initfn(Object *obj)
 144 {
 145     AVRCPU *cpu = AVR_CPU(obj);
 146
 147     /* Set the number of interrupts supported by the CPU. */
 148     qdev_init_gpio_in(DEVICE(cpu), avr_cpu_set_int,
 149                       sizeof(cpu->env.intsrc) * 8);
 150 }
 151
 152 static Property avr_cpu_properties[] = {
 153     DEFINE_PROP_UINT32("init-sp", AVRCPU, init_sp, 0),
 154     DEFINE_PROP_END_OF_LIST()
 155 };
 156
 157 static ObjectClass *avr_cpu_class_by_name(const char *cpu_model)
 158 {
 159     return object_class_by_name(cpu_model);
 160 }
 161
 162 static void avr_cpu_dump_state(CPUState *cs, FILE *f, int flags)
 163 {
 164     CPUAVRState *env = cpu_env(cs);
 165     int i;
 166
 167     qemu_fprintf(f, "\n");
 168     qemu_fprintf(f, "PC:    %06x\n", env->pc_w * 2); /* PC points to words */
 169     qemu_fprintf(f, "SP:      %04x\n", env->sp);
 170     qemu_fprintf(f, "rampD:     %02x\n", env->rampD >> 16);
 171     qemu_fprintf(f, "rampX:     %02x\n", env->rampX >> 16);
 172     qemu_fprintf(f, "rampY:     %02x\n", env->rampY >> 16);
 173     qemu_fprintf(f, "rampZ:     %02x\n", env->rampZ >> 16);
 174     qemu_fprintf(f, "EIND:      %02x\n", env->eind >> 16);
 175     qemu_fprintf(f, "X:       %02x%02x\n", env->r[27], env->r[26]);
 176     qemu_fprintf(f, "Y:       %02x%02x\n", env->r[29], env->r[28]);
 177     qemu_fprintf(f, "Z:       %02x%02x\n", env->r[31], env->r[30]);
 178     qemu_fprintf(f, "SREG:    [ %c %c %c %c %c %c %c %c ]\n",
 179                  env->sregI ? 'I' : '-',
 180                  env->sregT ? 'T' : '-',
 181                  env->sregH ? 'H' : '-',
 182                  env->sregS ? 'S' : '-',
 183                  env->sregV ? 'V' : '-',
 184                  env->sregN ? '-' : 'N', /* Zf has negative logic */
 185                  env->sregZ ? 'Z' : '-',
 186                  env->sregC ? 'I' : '-');
 187     qemu_fprintf(f, "SKIP:    %02x\n", env->skip);
 188
 189     qemu_fprintf(f, "\n");
 190     for (i = 0; i < ARRAY_SIZE(env->r); i++) {
 191         qemu_fprintf(f, "R[%02d]:  %02x   ", i, env->r[i]);
 192
 193         if ((i % 8) == 7) {
 194             qemu_fprintf(f, "\n");
 195         }
 196     }
 197     qemu_fprintf(f, "\n");
 198 }
 199
 200 #include "hw/core/sysemu-cpu-ops.h"
 201
 202 static const struct SysemuCPUOps avr_sysemu_ops = {
 203     .get_phys_page_debug = avr_cpu_get_phys_page_debug,
 204 };
 205
 206 #include "hw/core/tcg-cpu-ops.h"
 207
 208 static const TCGCPUOps avr_tcg_ops = {
 209     .initialize = avr_cpu_tcg_init,
 210     .synchronize_from_tb = avr_cpu_synchronize_from_tb,
 211     .restore_state_to_opc = avr_restore_state_to_opc,
 212     .cpu_exec_interrupt = avr_cpu_exec_interrupt,
 213     .tlb_fill = avr_cpu_tlb_fill,
 214     .do_interrupt = avr_cpu_do_interrupt,
 215 };
 216
 217 static void avr_cpu_class_init(ObjectClass *oc, void *data)
 218 {
 219     DeviceClass *dc = DEVICE_CLASS(oc);
 220     CPUClass *cc = CPU_CLASS(oc);
 221     AVRCPUClass *mcc = AVR_CPU_CLASS(oc);
 222     ResettableClass *rc = RESETTABLE_CLASS(oc);
 223
 224     device_class_set_parent_realize(dc, avr_cpu_realizefn, &mcc->parent_realize);
 225
 226     device_class_set_props(dc, avr_cpu_properties);
 227
 228     resettable_class_set_parent_phases(rc, NULL, avr_cpu_reset_hold, NULL,
 229                                        &mcc->parent_phases);
 230
 231     cc->class_by_name = avr_cpu_class_by_name;
 232
 233     cc->has_work = avr_cpu_has_work;
 234     cc->mmu_index = avr_cpu_mmu_index;
 235     cc->dump_state = avr_cpu_dump_state;
 236     cc->set_pc = avr_cpu_set_pc;
 237     cc->get_pc = avr_cpu_get_pc;
 238     dc->vmsd = &vms_avr_cpu;
 239     cc->sysemu_ops = &avr_sysemu_ops;
 240     cc->disas_set_info = avr_cpu_disas_set_info;
 241     cc->gdb_read_register = avr_cpu_gdb_read_register;
 242     cc->gdb_write_register = avr_cpu_gdb_write_register;
 243     cc->gdb_adjust_breakpoint = avr_cpu_gdb_adjust_breakpoint;
 244     cc->gdb_core_xml_file = "avr-cpu.xml";
 245     cc->tcg_ops = &avr_tcg_ops;
 246 }
 247
 248 /*
 249  * Setting features of AVR core type avr5
 250  * --------------------------------------
 251  *
 252  * This type of AVR core is present in the following AVR MCUs:
 253  *
 254  * ata5702m322, ata5782, ata5790, ata5790n, ata5791, ata5795, ata5831, ata6613c,
 255  * ata6614q, ata8210, ata8510, atmega16, atmega16a, atmega161, atmega162,
 256  * atmega163, atmega164a, atmega164p, atmega164pa, atmega165, atmega165a,
 257  * atmega165p, atmega165pa, atmega168, atmega168a, atmega168p, atmega168pa,
 258  * atmega168pb, atmega169, atmega169a, atmega169p, atmega169pa, atmega16hvb,
 259  * atmega16hvbrevb, atmega16m1, atmega16u4, atmega32a, atmega32, atmega323,
 260  * atmega324a, atmega324p, atmega324pa, atmega325, atmega325a, atmega325p,
 261  * atmega325pa, atmega3250, atmega3250a, atmega3250p, atmega3250pa, atmega328,
 262  * atmega328p, atmega328pb, atmega329, atmega329a, atmega329p, atmega329pa,
 263  * atmega3290, atmega3290a, atmega3290p, atmega3290pa, atmega32c1, atmega32m1,
 264  * atmega32u4, atmega32u6, atmega406, atmega64, atmega64a, atmega640, atmega644,
 265  * atmega644a, atmega644p, atmega644pa, atmega645, atmega645a, atmega645p,
 266  * atmega6450, atmega6450a, atmega6450p, atmega649, atmega649a, atmega649p,
 267  * atmega6490, atmega16hva, atmega16hva2, atmega32hvb, atmega6490a, atmega6490p,
 268  * atmega64c1, atmega64m1, atmega64hve, atmega64hve2, atmega64rfr2,
 269  * atmega644rfr2, atmega32hvbrevb, at90can32, at90can64, at90pwm161, at90pwm216,
 270  * at90pwm316, at90scr100, at90usb646, at90usb647, at94k, m3000
 271  */
 272 static void avr_avr5_initfn(Object *obj)
 273 {
 274     CPUAVRState *env = cpu_env(CPU(obj));
 275
 276     set_avr_feature(env, AVR_FEATURE_LPM);
 277     set_avr_feature(env, AVR_FEATURE_IJMP_ICALL);
 278     set_avr_feature(env, AVR_FEATURE_ADIW_SBIW);
 279     set_avr_feature(env, AVR_FEATURE_SRAM);
 280     set_avr_feature(env, AVR_FEATURE_BREAK);
 281
 282     set_avr_feature(env, AVR_FEATURE_2_BYTE_PC);
 283     set_avr_feature(env, AVR_FEATURE_2_BYTE_SP);
 284     set_avr_feature(env, AVR_FEATURE_JMP_CALL);
 285     set_avr_feature(env, AVR_FEATURE_LPMX);
 286     set_avr_feature(env, AVR_FEATURE_MOVW);
 287     set_avr_feature(env, AVR_FEATURE_MUL);
 288 }
 289
 290 /*
 291  * Setting features of AVR core type avr51
 292  * --------------------------------------
 293  *
 294  * This type of AVR core is present in the following AVR MCUs:
 295  *
 296  * atmega128, atmega128a, atmega1280, atmega1281, atmega1284, atmega1284p,
 297  * atmega128rfa1, atmega128rfr2, atmega1284rfr2, at90can128, at90usb1286,
 298  * at90usb1287
 299  */
 300 static void avr_avr51_initfn(Object *obj)
 301 {
 302     CPUAVRState *env = cpu_env(CPU(obj));
 303
 304     set_avr_feature(env, AVR_FEATURE_LPM);
 305     set_avr_feature(env, AVR_FEATURE_IJMP_ICALL);
 306     set_avr_feature(env, AVR_FEATURE_ADIW_SBIW);
 307     set_avr_feature(env, AVR_FEATURE_SRAM);
 308     set_avr_feature(env, AVR_FEATURE_BREAK);
 309
 310     set_avr_feature(env, AVR_FEATURE_2_BYTE_PC);
 311     set_avr_feature(env, AVR_FEATURE_2_BYTE_SP);
 312     set_avr_feature(env, AVR_FEATURE_RAMPZ);
 313     set_avr_feature(env, AVR_FEATURE_ELPMX);
 314     set_avr_feature(env, AVR_FEATURE_ELPM);
 315     set_avr_feature(env, AVR_FEATURE_JMP_CALL);
 316     set_avr_feature(env, AVR_FEATURE_LPMX);
 317     set_avr_feature(env, AVR_FEATURE_MOVW);
 318     set_avr_feature(env, AVR_FEATURE_MUL);
 319 }
 320
 321 /*
 322  * Setting features of AVR core type avr6
 323  * --------------------------------------
 324  *
 325  * This type of AVR core is present in the following AVR MCUs:
 326  *
 327  * atmega2560, atmega2561, atmega256rfr2, atmega2564rfr2
 328  */
 329 static void avr_avr6_initfn(Object *obj)
 330 {
 331     CPUAVRState *env = cpu_env(CPU(obj));
 332
 333     set_avr_feature(env, AVR_FEATURE_LPM);
 334     set_avr_feature(env, AVR_FEATURE_IJMP_ICALL);
 335     set_avr_feature(env, AVR_FEATURE_ADIW_SBIW);
 336     set_avr_feature(env, AVR_FEATURE_SRAM);
 337     set_avr_feature(env, AVR_FEATURE_BREAK);
 338
 339     set_avr_feature(env, AVR_FEATURE_3_BYTE_PC);
 340     set_avr_feature(env, AVR_FEATURE_2_BYTE_SP);
 341     set_avr_feature(env, AVR_FEATURE_RAMPZ);
 342     set_avr_feature(env, AVR_FEATURE_EIJMP_EICALL);
 343     set_avr_feature(env, AVR_FEATURE_ELPMX);
 344     set_avr_feature(env, AVR_FEATURE_ELPM);
 345     set_avr_feature(env, AVR_FEATURE_JMP_CALL);
 346     set_avr_feature(env, AVR_FEATURE_LPMX);
 347     set_avr_feature(env, AVR_FEATURE_MOVW);
 348     set_avr_feature(env, AVR_FEATURE_MUL);
 349 }
 350
 351 typedef struct AVRCPUInfo {
 352     const char *name;
 353     void (*initfn)(Object *obj);
 354 } AVRCPUInfo;
 355
 356
 357 #define DEFINE_AVR_CPU_TYPE(model, initfn) \
 358     { \
 359         .parent = TYPE_AVR_CPU, \
 360         .instance_init = initfn, \
 361         .name = AVR_CPU_TYPE_NAME(model), \
 362     }
 363
 364 static const TypeInfo avr_cpu_type_info[] = {
 365     {
 366         .name = TYPE_AVR_CPU,
 367         .parent = TYPE_CPU,
 368         .instance_size = sizeof(AVRCPU),
 369         .instance_align = __alignof(AVRCPU),
 370         .instance_init = avr_cpu_initfn,
 371         .class_size = sizeof(AVRCPUClass),
 372         .class_init = avr_cpu_class_init,
 373         .abstract = true,
 374     },
 375     DEFINE_AVR_CPU_TYPE("avr5", avr_avr5_initfn),
 376     DEFINE_AVR_CPU_TYPE("avr51", avr_avr51_initfn),
 377     DEFINE_AVR_CPU_TYPE("avr6", avr_avr6_initfn),
 378 };
 379
 380 DEFINE_TYPES(avr_cpu_type_info)