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 /* !CONFIG_USER_ONLY */ 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 assert(xtensa_option_enabled(env->config, 274 XTENSA_OPTION_UNALIGNED_EXCEPTION)); 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 bool xtensa_cpu_tlb_fill(CPUState *cs, vaddr address, int size, 282 MMUAccessType access_type, int mmu_idx, 283 bool probe, uintptr_t retaddr) 284 { 285 XtensaCPU *cpu = XTENSA_CPU(cs); 286 CPUXtensaState *env = &cpu->env; 287 uint32_t paddr; 288 uint32_t page_size; 289 unsigned access; 290 int ret = xtensa_get_physical_addr(env, true, address, access_type, 291 mmu_idx, &paddr, &page_size, &access); 292 293 qemu_log_mask(CPU_LOG_MMU, "%s(%08" VADDR_PRIx 294 ", %d, %d) -> %08x, ret = %d\n", 295 __func__, address, access_type, mmu_idx, paddr, ret); 296 297 if (ret == 0) { 298 tlb_set_page(cs, 299 address & TARGET_PAGE_MASK, 300 paddr & TARGET_PAGE_MASK, 301 access, mmu_idx, page_size); 302 return true; 303 } else if (probe) { 304 return false; 305 } else { 306 cpu_restore_state(cs, retaddr, true); 307 HELPER(exception_cause_vaddr)(env, env->pc, ret, address); 308 } 309 } 310 311 void xtensa_cpu_do_transaction_failed(CPUState *cs, hwaddr physaddr, vaddr addr, 312 unsigned size, MMUAccessType access_type, 313 int mmu_idx, MemTxAttrs attrs, 314 MemTxResult response, uintptr_t retaddr) 315 { 316 XtensaCPU *cpu = XTENSA_CPU(cs); 317 CPUXtensaState *env = &cpu->env; 318 319 cpu_restore_state(cs, retaddr, true); 320 HELPER(exception_cause_vaddr)(env, env->pc, 321 access_type == MMU_INST_FETCH ? 322 INSTR_PIF_ADDR_ERROR_CAUSE : 323 LOAD_STORE_PIF_ADDR_ERROR_CAUSE, 324 addr); 325 } 326 327 void xtensa_runstall(CPUXtensaState *env, bool runstall) 328 { 329 CPUState *cpu = env_cpu(env); 330 331 env->runstall = runstall; 332 cpu->halted = runstall; 333 if (runstall) { 334 cpu_interrupt(cpu, CPU_INTERRUPT_HALT); 335 } else { 336 qemu_cpu_kick(cpu); 337 } 338 } 339 #endif /* !CONFIG_USER_ONLY */ 340