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 "qemu/log.h"
  30 #include "cpu.h"
  31 #include "exec/exec-all.h"
  32 #include "exec/gdbstub.h"
  33 #include "exec/helper-proto.h"
  34 #include "qemu/error-report.h"
  35 #include "qemu/qemu-print.h"
  36 #include "qemu/host-utils.h"
  37
  38 static struct XtensaConfigList *xtensa_cores;
  39
  40 static void add_translator_to_hash(GHashTable *translator,
  41                                    const char *name,
  42                                    const XtensaOpcodeOps *opcode)
  43 {
  44     if (!g_hash_table_insert(translator, (void *)name, (void *)opcode)) {
  45         error_report("Multiple definitions of '%s' opcode in a single table",
  46                      name);
  47     }
  48 }
  49
  50 static GHashTable *hash_opcode_translators(const XtensaOpcodeTranslators *t)
  51 {
  52     unsigned i, j;
  53     GHashTable *translator = g_hash_table_new(g_str_hash, g_str_equal);
  54
  55     for (i = 0; i < t->num_opcodes; ++i) {
  56         if (t->opcode[i].op_flags & XTENSA_OP_NAME_ARRAY) {
  57             const char * const *name = t->opcode[i].name;
  58
  59             for (j = 0; name[j]; ++j) {
  60                 add_translator_to_hash(translator,
  61                                        (void *)name[j],
  62                                        (void *)(t->opcode + i));
  63             }
  64         } else {
  65             add_translator_to_hash(translator,
  66                                    (void *)t->opcode[i].name,
  67                                    (void *)(t->opcode + i));
  68         }
  69     }
  70     return translator;
  71 }
  72
  73 static XtensaOpcodeOps *
  74 xtensa_find_opcode_ops(const XtensaOpcodeTranslators *t,
  75                        const char *name)
  76 {
  77     static GHashTable *translators;
  78     GHashTable *translator;
  79
  80     if (translators == NULL) {
  81         translators = g_hash_table_new(g_direct_hash, g_direct_equal);
  82     }
  83     translator = g_hash_table_lookup(translators, t);
  84     if (translator == NULL) {
  85         translator = hash_opcode_translators(t);
  86         g_hash_table_insert(translators, (void *)t, translator);
  87     }
  88     return g_hash_table_lookup(translator, name);
  89 }
  90
  91 static void init_libisa(XtensaConfig *config)
  92 {
  93     unsigned i, j;
  94     unsigned opcodes;
  95     unsigned formats;
  96     unsigned regfiles;
  97
  98     config->isa = xtensa_isa_init(config->isa_internal, NULL, NULL);
  99     assert(xtensa_isa_maxlength(config->isa) <= MAX_INSN_LENGTH);
 100     assert(xtensa_insnbuf_size(config->isa) <= MAX_INSNBUF_LENGTH);
 101     opcodes = xtensa_isa_num_opcodes(config->isa);
 102     formats = xtensa_isa_num_formats(config->isa);
 103     regfiles = xtensa_isa_num_regfiles(config->isa);
 104     config->opcode_ops = g_new(XtensaOpcodeOps *, opcodes);
 105
 106     for (i = 0; i < formats; ++i) {
 107         assert(xtensa_format_num_slots(config->isa, i) <= MAX_INSN_SLOTS);
 108     }
 109
 110     for (i = 0; i < opcodes; ++i) {
 111         const char *opc_name = xtensa_opcode_name(config->isa, i);
 112         XtensaOpcodeOps *ops = NULL;
 113
 114         assert(xtensa_opcode_num_operands(config->isa, i) <= MAX_OPCODE_ARGS);
 115         if (!config->opcode_translators) {
 116             ops = xtensa_find_opcode_ops(&xtensa_core_opcodes, opc_name);
 117         } else {
 118             for (j = 0; !ops && config->opcode_translators[j]; ++j) {
 119                 ops = xtensa_find_opcode_ops(config->opcode_translators[j],
 120                                              opc_name);
 121             }
 122         }
 123 #ifdef DEBUG
 124         if (ops == NULL) {
 125             fprintf(stderr,
 126                     "opcode translator not found for %s's opcode '%s'\n",
 127                     config->name, opc_name);
 128         }
 129 #endif
 130         config->opcode_ops[i] = ops;
 131     }
 132     config->a_regfile = xtensa_regfile_lookup(config->isa, "AR");
 133
 134     config->regfile = g_new(void **, regfiles);
 135     for (i = 0; i < regfiles; ++i) {
 136         const char *name = xtensa_regfile_name(config->isa, i);
 137         int entries = xtensa_regfile_num_entries(config->isa, i);
 138         int bits = xtensa_regfile_num_bits(config->isa, i);
 139
 140         config->regfile[i] = xtensa_get_regfile_by_name(name, entries, bits);
 141 #ifdef DEBUG
 142         if (config->regfile[i] == NULL) {
 143             fprintf(stderr, "regfile '%s' not found for %s\n",
 144                     name, config->name);
 145         }
 146 #endif
 147     }
 148     xtensa_collect_sr_names(config);
 149 }
 150
 151 static void xtensa_finalize_config(XtensaConfig *config)
 152 {
 153     if (config->isa_internal) {
 154         init_libisa(config);
 155     }
 156
 157     if (config->gdb_regmap.num_regs == 0 ||
 158         config->gdb_regmap.num_core_regs == 0) {
 159         unsigned n_regs = 0;
 160         unsigned n_core_regs = 0;
 161
 162         xtensa_count_regs(config, &n_regs, &n_core_regs);
 163         if (config->gdb_regmap.num_regs == 0) {
 164             config->gdb_regmap.num_regs = n_regs;
 165         }
 166         if (config->gdb_regmap.num_core_regs == 0) {
 167             config->gdb_regmap.num_core_regs = n_core_regs;
 168         }
 169     }
 170 }
 171
 172 static void xtensa_core_class_init(ObjectClass *oc, void *data)
 173 {
 174     CPUClass *cc = CPU_CLASS(oc);
 175     XtensaCPUClass *xcc = XTENSA_CPU_CLASS(oc);
 176     XtensaConfig *config = data;
 177
 178     xtensa_finalize_config(config);
 179     xcc->config = config;
 180
 181     /*
 182      * Use num_core_regs to see only non-privileged registers in an unmodified
 183      * gdb. Use num_regs to see all registers. gdb modification is required
 184      * for that: reset bit 0 in the 'flags' field of the registers definitions
 185      * in the gdb/xtensa-config.c inside gdb source tree or inside gdb overlay.
 186      */
 187     cc->gdb_num_core_regs = config->gdb_regmap.num_regs;
 188 }
 189
 190 void xtensa_register_core(XtensaConfigList *node)
 191 {
 192     TypeInfo type = {
 193         .parent = TYPE_XTENSA_CPU,
 194         .class_init = xtensa_core_class_init,
 195         .class_data = (void *)node->config,
 196     };
 197
 198     node->next = xtensa_cores;
 199     xtensa_cores = node;
 200     type.name = g_strdup_printf(XTENSA_CPU_TYPE_NAME("%s"), node->config->name);
 201     type_register(&type);
 202     g_free((gpointer)type.name);
 203 }
 204
 205 static uint32_t check_hw_breakpoints(CPUXtensaState *env)
 206 {
 207     unsigned i;
 208
 209     for (i = 0; i < env->config->ndbreak; ++i) {
 210         if (env->cpu_watchpoint[i] &&
 211                 env->cpu_watchpoint[i]->flags & BP_WATCHPOINT_HIT) {
 212             return DEBUGCAUSE_DB | (i << DEBUGCAUSE_DBNUM_SHIFT);
 213         }
 214     }
 215     return 0;
 216 }
 217
 218 void xtensa_breakpoint_handler(CPUState *cs)
 219 {
 220     XtensaCPU *cpu = XTENSA_CPU(cs);
 221     CPUXtensaState *env = &cpu->env;
 222
 223     if (cs->watchpoint_hit) {
 224         if (cs->watchpoint_hit->flags & BP_CPU) {
 225             uint32_t cause;
 226
 227             cs->watchpoint_hit = NULL;
 228             cause = check_hw_breakpoints(env);
 229             if (cause) {
 230                 debug_exception_env(env, cause);
 231             }
 232             cpu_loop_exit_noexc(cs);
 233         }
 234     }
 235 }
 236
 237 void xtensa_cpu_list(void)
 238 {
 239     XtensaConfigList *core = xtensa_cores;
 240     qemu_printf("Available CPUs:\n");
 241     for (; core; core = core->next) {
 242         qemu_printf("  %s\n", core->config->name);
 243     }
 244 }
 245
 246 #ifndef CONFIG_USER_ONLY
 247 void xtensa_cpu_do_unaligned_access(CPUState *cs,
 248                                     vaddr addr, MMUAccessType access_type,
 249                                     int mmu_idx, uintptr_t retaddr)
 250 {
 251     XtensaCPU *cpu = XTENSA_CPU(cs);
 252     CPUXtensaState *env = &cpu->env;
 253
 254     assert(xtensa_option_enabled(env->config,
 255                                  XTENSA_OPTION_UNALIGNED_EXCEPTION));
 256     cpu_restore_state(CPU(cpu), retaddr, true);
 257     HELPER(exception_cause_vaddr)(env,
 258                                   env->pc, LOAD_STORE_ALIGNMENT_CAUSE,
 259                                   addr);
 260 }
 261
 262 bool xtensa_cpu_tlb_fill(CPUState *cs, vaddr address, int size,
 263                          MMUAccessType access_type, int mmu_idx,
 264                          bool probe, uintptr_t retaddr)
 265 {
 266     XtensaCPU *cpu = XTENSA_CPU(cs);
 267     CPUXtensaState *env = &cpu->env;
 268     uint32_t paddr;
 269     uint32_t page_size;
 270     unsigned access;
 271     int ret = xtensa_get_physical_addr(env, true, address, access_type,
 272                                        mmu_idx, &paddr, &page_size, &access);
 273
 274     qemu_log_mask(CPU_LOG_MMU, "%s(%08" VADDR_PRIx
 275                   ", %d, %d) -> %08x, ret = %d\n",
 276                   __func__, address, access_type, mmu_idx, paddr, ret);
 277
 278     if (ret == 0) {
 279         tlb_set_page(cs,
 280                      address & TARGET_PAGE_MASK,
 281                      paddr & TARGET_PAGE_MASK,
 282                      access, mmu_idx, page_size);
 283         return true;
 284     } else if (probe) {
 285         return false;
 286     } else {
 287         cpu_restore_state(cs, retaddr, true);
 288         HELPER(exception_cause_vaddr)(env, env->pc, ret, address);
 289     }
 290 }
 291
 292 void xtensa_cpu_do_transaction_failed(CPUState *cs, hwaddr physaddr, vaddr addr,
 293                                       unsigned size, MMUAccessType access_type,
 294                                       int mmu_idx, MemTxAttrs attrs,
 295                                       MemTxResult response, uintptr_t retaddr)
 296 {
 297     XtensaCPU *cpu = XTENSA_CPU(cs);
 298     CPUXtensaState *env = &cpu->env;
 299
 300     cpu_restore_state(cs, retaddr, true);
 301     HELPER(exception_cause_vaddr)(env, env->pc,
 302                                   access_type == MMU_INST_FETCH ?
 303                                   INSTR_PIF_ADDR_ERROR_CAUSE :
 304                                   LOAD_STORE_PIF_ADDR_ERROR_CAUSE,
 305                                   addr);
 306 }
 307
 308 void xtensa_runstall(CPUXtensaState *env, bool runstall)
 309 {
 310     CPUState *cpu = env_cpu(env);
 311
 312     env->runstall = runstall;
 313     cpu->halted = runstall;
 314     if (runstall) {
 315         cpu_interrupt(cpu, CPU_INTERRUPT_HALT);
 316     } else {
 317         qemu_cpu_kick(cpu);
 318     }
 319 }
 320 #endif /* !CONFIG_USER_ONLY */