target/xtensa/helper.c

   1 /*
   2  * Copyright (c) 2011, Max Filippov, Open Source and Linux Lab.
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions are met:
   7  *     * Redistributions of source code must retain the above copyright
   8  *       notice, this list of conditions and the following disclaimer.
   9  *     * Redistributions in binary form must reproduce the above copyright
  10  *       notice, this list of conditions and the following disclaimer in the
  11  *       documentation and/or other materials provided with the distribution.
  12  *     * Neither the name of the Open Source and Linux Lab nor the
  13  *       names of its contributors may be used to endorse or promote products
  14  *       derived from this software without specific prior written permission.
  15  *
  16  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
  17  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  18  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  19  * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
  20  * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
  21  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  22  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
  23  * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  24  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  25  * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  26  */
  27
  28 #include "qemu/osdep.h"
  29 #include "cpu.h"
  30 #include "exec/exec-all.h"
  31 #include "exec/gdbstub.h"
  32 #include "exec/helper-proto.h"
  33 #include "qemu/error-report.h"
  34 #include "qemu/qemu-print.h"
  35 #include "qemu/host-utils.h"
  36
  37 static struct XtensaConfigList *xtensa_cores;
  38
  39 static void add_translator_to_hash(GHashTable *translator,
  40                                    const char *name,
  41                                    const XtensaOpcodeOps *opcode)
  42 {
  43     if (!g_hash_table_insert(translator, (void *)name, (void *)opcode)) {
  44         error_report("Multiple definitions of '%s' opcode in a single table",
  45                      name);
  46     }
  47 }
  48
  49 static GHashTable *hash_opcode_translators(const XtensaOpcodeTranslators *t)
  50 {
  51     unsigned i, j;
  52     GHashTable *translator = g_hash_table_new(g_str_hash, g_str_equal);
  53
  54     for (i = 0; i < t->num_opcodes; ++i) {
  55         if (t->opcode[i].op_flags & XTENSA_OP_NAME_ARRAY) {
  56             const char * const *name = t->opcode[i].name;
  57
  58             for (j = 0; name[j]; ++j) {
  59                 add_translator_to_hash(translator,
  60                                        (void *)name[j],
  61                                        (void *)(t->opcode + i));
  62             }
  63         } else {
  64             add_translator_to_hash(translator,
  65                                    (void *)t->opcode[i].name,
  66                                    (void *)(t->opcode + i));
  67         }
  68     }
  69     return translator;
  70 }
  71
  72 static XtensaOpcodeOps *
  73 xtensa_find_opcode_ops(const XtensaOpcodeTranslators *t,
  74                        const char *name)
  75 {
  76     static GHashTable *translators;
  77     GHashTable *translator;
  78
  79     if (translators == NULL) {
  80         translators = g_hash_table_new(g_direct_hash, g_direct_equal);
  81     }
  82     translator = g_hash_table_lookup(translators, t);
  83     if (translator == NULL) {
  84         translator = hash_opcode_translators(t);
  85         g_hash_table_insert(translators, (void *)t, translator);
  86     }
  87     return g_hash_table_lookup(translator, name);
  88 }
  89
  90 static void init_libisa(XtensaConfig *config)
  91 {
  92     unsigned i, j;
  93     unsigned opcodes;
  94     unsigned formats;
  95     unsigned regfiles;
  96
  97     config->isa = xtensa_isa_init(config->isa_internal, NULL, NULL);
  98     assert(xtensa_isa_maxlength(config->isa) <= MAX_INSN_LENGTH);
  99     assert(xtensa_insnbuf_size(config->isa) <= MAX_INSNBUF_LENGTH);
 100     opcodes = xtensa_isa_num_opcodes(config->isa);
 101     formats = xtensa_isa_num_formats(config->isa);
 102     regfiles = xtensa_isa_num_regfiles(config->isa);
 103     config->opcode_ops = g_new(XtensaOpcodeOps *, opcodes);
 104
 105     for (i = 0; i < formats; ++i) {
 106         assert(xtensa_format_num_slots(config->isa, i) <= MAX_INSN_SLOTS);
 107     }
 108
 109     for (i = 0; i < opcodes; ++i) {
 110         const char *opc_name = xtensa_opcode_name(config->isa, i);
 111         XtensaOpcodeOps *ops = NULL;
 112
 113         assert(xtensa_opcode_num_operands(config->isa, i) <= MAX_OPCODE_ARGS);
 114         if (!config->opcode_translators) {
 115             ops = xtensa_find_opcode_ops(&xtensa_core_opcodes, opc_name);
 116         } else {
 117             for (j = 0; !ops && config->opcode_translators[j]; ++j) {
 118                 ops = xtensa_find_opcode_ops(config->opcode_translators[j],
 119                                              opc_name);
 120             }
 121         }
 122 #ifdef DEBUG
 123         if (ops == NULL) {
 124             fprintf(stderr,
 125                     "opcode translator not found for %s's opcode '%s'\n",
 126                     config->name, opc_name);
 127         }
 128 #endif
 129         config->opcode_ops[i] = ops;
 130     }
 131     config->a_regfile = xtensa_regfile_lookup(config->isa, "AR");
 132
 133     config->regfile = g_new(void **, regfiles);
 134     for (i = 0; i < regfiles; ++i) {
 135         const char *name = xtensa_regfile_name(config->isa, i);
 136         int entries = xtensa_regfile_num_entries(config->isa, i);
 137         int bits = xtensa_regfile_num_bits(config->isa, i);
 138
 139         config->regfile[i] = xtensa_get_regfile_by_name(name, entries, bits);
 140 #ifdef DEBUG
 141         if (config->regfile[i] == NULL) {
 142             fprintf(stderr, "regfile '%s' not found for %s\n",
 143                     name, config->name);
 144         }
 145 #endif
 146     }
 147     xtensa_collect_sr_names(config);
 148 }
 149
 150 static void xtensa_finalize_config(XtensaConfig *config)
 151 {
 152     if (config->isa_internal) {
 153         init_libisa(config);
 154     }
 155
 156     if (config->gdb_regmap.num_regs == 0 ||
 157         config->gdb_regmap.num_core_regs == 0) {
 158         unsigned n_regs = 0;
 159         unsigned n_core_regs = 0;
 160
 161         xtensa_count_regs(config, &n_regs, &n_core_regs);
 162         if (config->gdb_regmap.num_regs == 0) {
 163             config->gdb_regmap.num_regs = n_regs;
 164         }
 165         if (config->gdb_regmap.num_core_regs == 0) {
 166             config->gdb_regmap.num_core_regs = n_core_regs;
 167         }
 168     }
 169 }
 170
 171 static void xtensa_core_class_init(ObjectClass *oc, void *data)
 172 {
 173     CPUClass *cc = CPU_CLASS(oc);
 174     XtensaCPUClass *xcc = XTENSA_CPU_CLASS(oc);
 175     XtensaConfig *config = data;
 176
 177     xtensa_finalize_config(config);
 178     xcc->config = config;
 179
 180     /*
 181      * Use num_core_regs to see only non-privileged registers in an unmodified
 182      * gdb. Use num_regs to see all registers. gdb modification is required
 183      * for that: reset bit 0 in the 'flags' field of the registers definitions
 184      * in the gdb/xtensa-config.c inside gdb source tree or inside gdb overlay.
 185      */
 186     cc->gdb_num_core_regs = config->gdb_regmap.num_regs;
 187 }
 188
 189 void xtensa_register_core(XtensaConfigList *node)
 190 {
 191     TypeInfo type = {
 192         .parent = TYPE_XTENSA_CPU,
 193         .class_init = xtensa_core_class_init,
 194         .class_data = (void *)node->config,
 195     };
 196
 197     node->next = xtensa_cores;
 198     xtensa_cores = node;
 199     type.name = g_strdup_printf(XTENSA_CPU_TYPE_NAME("%s"), node->config->name);
 200     type_register(&type);
 201     g_free((gpointer)type.name);
 202 }
 203
 204 static uint32_t check_hw_breakpoints(CPUXtensaState *env)
 205 {
 206     unsigned i;
 207
 208     for (i = 0; i < env->config->ndbreak; ++i) {
 209         if (env->cpu_watchpoint[i] &&
 210                 env->cpu_watchpoint[i]->flags & BP_WATCHPOINT_HIT) {
 211             return DEBUGCAUSE_DB | (i << DEBUGCAUSE_DBNUM_SHIFT);
 212         }
 213     }
 214     return 0;
 215 }
 216
 217 void xtensa_breakpoint_handler(CPUState *cs)
 218 {
 219     XtensaCPU *cpu = XTENSA_CPU(cs);
 220     CPUXtensaState *env = &cpu->env;
 221
 222     if (cs->watchpoint_hit) {
 223         if (cs->watchpoint_hit->flags & BP_CPU) {
 224             uint32_t cause;
 225
 226             cs->watchpoint_hit = NULL;
 227             cause = check_hw_breakpoints(env);
 228             if (cause) {
 229                 debug_exception_env(env, cause);
 230             }
 231             cpu_loop_exit_noexc(cs);
 232         }
 233     }
 234 }
 235
 236 void xtensa_cpu_list(void)
 237 {
 238     XtensaConfigList *core = xtensa_cores;
 239     qemu_printf("Available CPUs:\n");
 240     for (; core; core = core->next) {
 241         qemu_printf("  %s\n", core->config->name);
 242     }
 243 }
 244
 245 #ifdef CONFIG_USER_ONLY
 246
 247 bool xtensa_cpu_tlb_fill(CPUState *cs, vaddr address, int size,
 248                          MMUAccessType access_type, int mmu_idx,
 249                          bool probe, uintptr_t retaddr)
 250 {
 251     XtensaCPU *cpu = XTENSA_CPU(cs);
 252     CPUXtensaState *env = &cpu->env;
 253
 254     qemu_log_mask(CPU_LOG_INT,
 255                   "%s: rw = %d, address = 0x%08" VADDR_PRIx ", size = %d\n",
 256                   __func__, access_type, address, size);
 257     env->sregs[EXCVADDR] = address;
 258     env->sregs[EXCCAUSE] = (access_type == MMU_DATA_STORE ?
 259                             STORE_PROHIBITED_CAUSE : LOAD_PROHIBITED_CAUSE);
 260     cs->exception_index = EXC_USER;
 261     cpu_loop_exit_restore(cs, retaddr);
 262 }
 263
 264 #else
 265
 266 void xtensa_cpu_do_unaligned_access(CPUState *cs,
 267                                     vaddr addr, MMUAccessType access_type,
 268                                     int mmu_idx, uintptr_t retaddr)
 269 {
 270     XtensaCPU *cpu = XTENSA_CPU(cs);
 271     CPUXtensaState *env = &cpu->env;
 272
 273     if (xtensa_option_enabled(env->config, XTENSA_OPTION_UNALIGNED_EXCEPTION) &&
 274         !xtensa_option_enabled(env->config, XTENSA_OPTION_HW_ALIGNMENT)) {
 275         cpu_restore_state(CPU(cpu), retaddr, true);
 276         HELPER(exception_cause_vaddr)(env,
 277                                       env->pc, LOAD_STORE_ALIGNMENT_CAUSE,
 278                                       addr);
 279     }
 280 }
 281
 282 bool xtensa_cpu_tlb_fill(CPUState *cs, vaddr address, int size,
 283                          MMUAccessType access_type, int mmu_idx,
 284                          bool probe, uintptr_t retaddr)
 285 {
 286     XtensaCPU *cpu = XTENSA_CPU(cs);
 287     CPUXtensaState *env = &cpu->env;
 288     uint32_t paddr;
 289     uint32_t page_size;
 290     unsigned access;
 291     int ret = xtensa_get_physical_addr(env, true, address, access_type,
 292                                        mmu_idx, &paddr, &page_size, &access);
 293
 294     qemu_log_mask(CPU_LOG_MMU, "%s(%08" VADDR_PRIx
 295                   ", %d, %d) -> %08x, ret = %d\n",
 296                   __func__, address, access_type, mmu_idx, paddr, ret);
 297
 298     if (ret == 0) {
 299         tlb_set_page(cs,
 300                      address & TARGET_PAGE_MASK,
 301                      paddr & TARGET_PAGE_MASK,
 302                      access, mmu_idx, page_size);
 303         return true;
 304     } else if (probe) {
 305         return false;
 306     } else {
 307         cpu_restore_state(cs, retaddr, true);
 308         HELPER(exception_cause_vaddr)(env, env->pc, ret, address);
 309     }
 310 }
 311
 312 void xtensa_cpu_do_transaction_failed(CPUState *cs, hwaddr physaddr, vaddr addr,
 313                                       unsigned size, MMUAccessType access_type,
 314                                       int mmu_idx, MemTxAttrs attrs,
 315                                       MemTxResult response, uintptr_t retaddr)
 316 {
 317     XtensaCPU *cpu = XTENSA_CPU(cs);
 318     CPUXtensaState *env = &cpu->env;
 319
 320     cpu_restore_state(cs, retaddr, true);
 321     HELPER(exception_cause_vaddr)(env, env->pc,
 322                                   access_type == MMU_INST_FETCH ?
 323                                   INSTR_PIF_ADDR_ERROR_CAUSE :
 324                                   LOAD_STORE_PIF_ADDR_ERROR_CAUSE,
 325                                   addr);
 326 }
 327
 328 void xtensa_runstall(CPUXtensaState *env, bool runstall)
 329 {
 330     CPUState *cpu = env_cpu(env);
 331
 332     env->runstall = runstall;
 333     cpu->halted = runstall;
 334     if (runstall) {
 335         cpu_interrupt(cpu, CPU_INTERRUPT_HALT);
 336     } else {
 337         qemu_cpu_kick(cpu);
 338     }
 339 }
 340 #endif