target/xtensa/cpu.c

   1 /*
   2  * QEMU Xtensa CPU
   3  *
   4  * Copyright (c) 2011, Max Filippov, Open Source and Linux Lab.
   5  * Copyright (c) 2012 SUSE LINUX Products GmbH
   6  * All rights reserved.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions are met:
  10  *     * Redistributions of source code must retain the above copyright
  11  *       notice, this list of conditions and the following disclaimer.
  12  *     * Redistributions in binary form must reproduce the above copyright
  13  *       notice, this list of conditions and the following disclaimer in the
  14  *       documentation and/or other materials provided with the distribution.
  15  *     * Neither the name of the Open Source and Linux Lab nor the
  16  *       names of its contributors may be used to endorse or promote products
  17  *       derived from this software without specific prior written permission.
  18  *
  19  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
  20  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  22  * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
  23  * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
  24  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  25  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
  26  * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  27  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  28  * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  29  */
  30
  31 #include "qemu/osdep.h"
  32 #include "qapi/error.h"
  33 #include "cpu.h"
  34 #include "fpu/softfloat.h"
  35 #include "qemu/module.h"
  36 #include "migration/vmstate.h"
  37
  38
  39 static void xtensa_cpu_set_pc(CPUState *cs, vaddr value)
  40 {
  41     XtensaCPU *cpu = XTENSA_CPU(cs);
  42
  43     cpu->env.pc = value;
  44 }
  45
  46 static bool xtensa_cpu_has_work(CPUState *cs)
  47 {
  48 #ifndef CONFIG_USER_ONLY
  49     XtensaCPU *cpu = XTENSA_CPU(cs);
  50
  51     return !cpu->env.runstall && cpu->env.pending_irq_level;
  52 #else
  53     return true;
  54 #endif
  55 }
  56
  57 #ifdef CONFIG_USER_ONLY
  58 static bool abi_call0;
  59
  60 void xtensa_set_abi_call0(void)
  61 {
  62     abi_call0 = true;
  63 }
  64
  65 bool xtensa_abi_call0(void)
  66 {
  67     return abi_call0;
  68 }
  69 #endif
  70
  71 static void xtensa_cpu_reset(DeviceState *dev)
  72 {
  73     CPUState *s = CPU(dev);
  74     XtensaCPU *cpu = XTENSA_CPU(s);
  75     XtensaCPUClass *xcc = XTENSA_CPU_GET_CLASS(cpu);
  76     CPUXtensaState *env = &cpu->env;
  77     bool dfpu = xtensa_option_enabled(env->config,
  78                                       XTENSA_OPTION_DFP_COPROCESSOR);
  79
  80     xcc->parent_reset(dev);
  81
  82     env->exception_taken = 0;
  83     env->pc = env->config->exception_vector[EXC_RESET0 + env->static_vectors];
  84     env->sregs[LITBASE] &= ~1;
  85 #ifndef CONFIG_USER_ONLY
  86     env->sregs[PS] = xtensa_option_enabled(env->config,
  87             XTENSA_OPTION_INTERRUPT) ? 0x1f : 0x10;
  88     env->pending_irq_level = 0;
  89 #else
  90     env->sregs[PS] = PS_UM | (3 << PS_RING_SHIFT);
  91     if (xtensa_option_enabled(env->config,
  92                               XTENSA_OPTION_WINDOWED_REGISTER) &&
  93         !xtensa_abi_call0()) {
  94         env->sregs[PS] |= PS_WOE;
  95     }
  96     env->sregs[CPENABLE] = 0xff;
  97 #endif
  98     env->sregs[VECBASE] = env->config->vecbase;
  99     env->sregs[IBREAKENABLE] = 0;
 100     env->sregs[MEMCTL] = MEMCTL_IL0EN & env->config->memctl_mask;
 101     env->sregs[ATOMCTL] = xtensa_option_enabled(env->config,
 102             XTENSA_OPTION_ATOMCTL) ? 0x28 : 0x15;
 103     env->sregs[CONFIGID0] = env->config->configid[0];
 104     env->sregs[CONFIGID1] = env->config->configid[1];
 105     env->exclusive_addr = -1;
 106
 107 #ifndef CONFIG_USER_ONLY
 108     reset_mmu(env);
 109     s->halted = env->runstall;
 110 #endif
 111     set_no_signaling_nans(!dfpu, &env->fp_status);
 112     set_use_first_nan(!dfpu, &env->fp_status);
 113 }
 114
 115 static ObjectClass *xtensa_cpu_class_by_name(const char *cpu_model)
 116 {
 117     ObjectClass *oc;
 118     char *typename;
 119
 120     typename = g_strdup_printf(XTENSA_CPU_TYPE_NAME("%s"), cpu_model);
 121     oc = object_class_by_name(typename);
 122     g_free(typename);
 123     if (oc == NULL || !object_class_dynamic_cast(oc, TYPE_XTENSA_CPU) ||
 124         object_class_is_abstract(oc)) {
 125         return NULL;
 126     }
 127     return oc;
 128 }
 129
 130 static void xtensa_cpu_disas_set_info(CPUState *cs, disassemble_info *info)
 131 {
 132     XtensaCPU *cpu = XTENSA_CPU(cs);
 133
 134     info->private_data = cpu->env.config->isa;
 135     info->print_insn = print_insn_xtensa;
 136 }
 137
 138 static void xtensa_cpu_realizefn(DeviceState *dev, Error **errp)
 139 {
 140     CPUState *cs = CPU(dev);
 141     XtensaCPUClass *xcc = XTENSA_CPU_GET_CLASS(dev);
 142     Error *local_err = NULL;
 143
 144 #ifndef CONFIG_USER_ONLY
 145     xtensa_irq_init(&XTENSA_CPU(dev)->env);
 146 #endif
 147
 148     cpu_exec_realizefn(cs, &local_err);
 149     if (local_err != NULL) {
 150         error_propagate(errp, local_err);
 151         return;
 152     }
 153
 154     cs->gdb_num_regs = xcc->config->gdb_regmap.num_regs;
 155
 156     qemu_init_vcpu(cs);
 157
 158     xcc->parent_realize(dev, errp);
 159 }
 160
 161 static void xtensa_cpu_initfn(Object *obj)
 162 {
 163     XtensaCPU *cpu = XTENSA_CPU(obj);
 164     XtensaCPUClass *xcc = XTENSA_CPU_GET_CLASS(obj);
 165     CPUXtensaState *env = &cpu->env;
 166
 167     cpu_set_cpustate_pointers(cpu);
 168     env->config = xcc->config;
 169
 170 #ifndef CONFIG_USER_ONLY
 171     env->address_space_er = g_malloc(sizeof(*env->address_space_er));
 172     env->system_er = g_malloc(sizeof(*env->system_er));
 173     memory_region_init_io(env->system_er, obj, NULL, env, "er",
 174                           UINT64_C(0x100000000));
 175     address_space_init(env->address_space_er, env->system_er, "ER");
 176 #endif
 177 }
 178
 179 static const VMStateDescription vmstate_xtensa_cpu = {
 180     .name = "cpu",
 181     .unmigratable = 1,
 182 };
 183
 184 #include "hw/core/tcg-cpu-ops.h"
 185
 186 static struct TCGCPUOps xtensa_tcg_ops = {
 187     .initialize = xtensa_translate_init,
 188     .cpu_exec_interrupt = xtensa_cpu_exec_interrupt,
 189     .tlb_fill = xtensa_cpu_tlb_fill,
 190     .debug_excp_handler = xtensa_breakpoint_handler,
 191
 192 #ifndef CONFIG_USER_ONLY
 193     .do_interrupt = xtensa_cpu_do_interrupt,
 194     .do_transaction_failed = xtensa_cpu_do_transaction_failed,
 195     .do_unaligned_access = xtensa_cpu_do_unaligned_access,
 196 #endif /* !CONFIG_USER_ONLY */
 197 };
 198
 199 static void xtensa_cpu_class_init(ObjectClass *oc, void *data)
 200 {
 201     DeviceClass *dc = DEVICE_CLASS(oc);
 202     CPUClass *cc = CPU_CLASS(oc);
 203     XtensaCPUClass *xcc = XTENSA_CPU_CLASS(cc);
 204
 205     device_class_set_parent_realize(dc, xtensa_cpu_realizefn,
 206                                     &xcc->parent_realize);
 207
 208     device_class_set_parent_reset(dc, xtensa_cpu_reset, &xcc->parent_reset);
 209
 210     cc->class_by_name = xtensa_cpu_class_by_name;
 211     cc->has_work = xtensa_cpu_has_work;
 212     cc->dump_state = xtensa_cpu_dump_state;
 213     cc->set_pc = xtensa_cpu_set_pc;
 214     cc->gdb_read_register = xtensa_cpu_gdb_read_register;
 215     cc->gdb_write_register = xtensa_cpu_gdb_write_register;
 216     cc->gdb_stop_before_watchpoint = true;
 217 #ifndef CONFIG_USER_ONLY
 218     cc->get_phys_page_debug = xtensa_cpu_get_phys_page_debug;
 219 #endif
 220     cc->disas_set_info = xtensa_cpu_disas_set_info;
 221     dc->vmsd = &vmstate_xtensa_cpu;
 222     cc->tcg_ops = &xtensa_tcg_ops;
 223 }
 224
 225 static const TypeInfo xtensa_cpu_type_info = {
 226     .name = TYPE_XTENSA_CPU,
 227     .parent = TYPE_CPU,
 228     .instance_size = sizeof(XtensaCPU),
 229     .instance_init = xtensa_cpu_initfn,
 230     .abstract = true,
 231     .class_size = sizeof(XtensaCPUClass),
 232     .class_init = xtensa_cpu_class_init,
 233 };
 234
 235 static void xtensa_cpu_register_types(void)
 236 {
 237     type_register_static(&xtensa_cpu_type_info);
 238 }
 239
 240 type_init(xtensa_cpu_register_types)