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 #endif
  97     env->sregs[VECBASE] = env->config->vecbase;
  98     env->sregs[IBREAKENABLE] = 0;
  99     env->sregs[MEMCTL] = MEMCTL_IL0EN & env->config->memctl_mask;
 100     env->sregs[ATOMCTL] = xtensa_option_enabled(env->config,
 101             XTENSA_OPTION_ATOMCTL) ? 0x28 : 0x15;
 102     env->sregs[CONFIGID0] = env->config->configid[0];
 103     env->sregs[CONFIGID1] = env->config->configid[1];
 104     env->exclusive_addr = -1;
 105
 106 #ifndef CONFIG_USER_ONLY
 107     reset_mmu(env);
 108     s->halted = env->runstall;
 109 #endif
 110     set_no_signaling_nans(!dfpu, &env->fp_status);
 111     set_use_first_nan(!dfpu, &env->fp_status);
 112 }
 113
 114 static ObjectClass *xtensa_cpu_class_by_name(const char *cpu_model)
 115 {
 116     ObjectClass *oc;
 117     char *typename;
 118
 119     typename = g_strdup_printf(XTENSA_CPU_TYPE_NAME("%s"), cpu_model);
 120     oc = object_class_by_name(typename);
 121     g_free(typename);
 122     if (oc == NULL || !object_class_dynamic_cast(oc, TYPE_XTENSA_CPU) ||
 123         object_class_is_abstract(oc)) {
 124         return NULL;
 125     }
 126     return oc;
 127 }
 128
 129 static void xtensa_cpu_disas_set_info(CPUState *cs, disassemble_info *info)
 130 {
 131     XtensaCPU *cpu = XTENSA_CPU(cs);
 132
 133     info->private_data = cpu->env.config->isa;
 134     info->print_insn = print_insn_xtensa;
 135 }
 136
 137 static void xtensa_cpu_realizefn(DeviceState *dev, Error **errp)
 138 {
 139     CPUState *cs = CPU(dev);
 140     XtensaCPUClass *xcc = XTENSA_CPU_GET_CLASS(dev);
 141     Error *local_err = NULL;
 142
 143 #ifndef CONFIG_USER_ONLY
 144     xtensa_irq_init(&XTENSA_CPU(dev)->env);
 145 #endif
 146
 147     cpu_exec_realizefn(cs, &local_err);
 148     if (local_err != NULL) {
 149         error_propagate(errp, local_err);
 150         return;
 151     }
 152
 153     cs->gdb_num_regs = xcc->config->gdb_regmap.num_regs;
 154
 155     qemu_init_vcpu(cs);
 156
 157     xcc->parent_realize(dev, errp);
 158 }
 159
 160 static void xtensa_cpu_initfn(Object *obj)
 161 {
 162     XtensaCPU *cpu = XTENSA_CPU(obj);
 163     XtensaCPUClass *xcc = XTENSA_CPU_GET_CLASS(obj);
 164     CPUXtensaState *env = &cpu->env;
 165
 166     cpu_set_cpustate_pointers(cpu);
 167     env->config = xcc->config;
 168
 169 #ifndef CONFIG_USER_ONLY
 170     env->address_space_er = g_malloc(sizeof(*env->address_space_er));
 171     env->system_er = g_malloc(sizeof(*env->system_er));
 172     memory_region_init_io(env->system_er, obj, NULL, env, "er",
 173                           UINT64_C(0x100000000));
 174     address_space_init(env->address_space_er, env->system_er, "ER");
 175 #endif
 176 }
 177
 178 static const VMStateDescription vmstate_xtensa_cpu = {
 179     .name = "cpu",
 180     .unmigratable = 1,
 181 };
 182
 183 static void xtensa_cpu_class_init(ObjectClass *oc, void *data)
 184 {
 185     DeviceClass *dc = DEVICE_CLASS(oc);
 186     CPUClass *cc = CPU_CLASS(oc);
 187     XtensaCPUClass *xcc = XTENSA_CPU_CLASS(cc);
 188
 189     device_class_set_parent_realize(dc, xtensa_cpu_realizefn,
 190                                     &xcc->parent_realize);
 191
 192     device_class_set_parent_reset(dc, xtensa_cpu_reset, &xcc->parent_reset);
 193
 194     cc->class_by_name = xtensa_cpu_class_by_name;
 195     cc->has_work = xtensa_cpu_has_work;
 196     cc->do_interrupt = xtensa_cpu_do_interrupt;
 197     cc->cpu_exec_interrupt = xtensa_cpu_exec_interrupt;
 198     cc->dump_state = xtensa_cpu_dump_state;
 199     cc->set_pc = xtensa_cpu_set_pc;
 200     cc->gdb_read_register = xtensa_cpu_gdb_read_register;
 201     cc->gdb_write_register = xtensa_cpu_gdb_write_register;
 202     cc->gdb_stop_before_watchpoint = true;
 203     cc->tlb_fill = xtensa_cpu_tlb_fill;
 204 #ifndef CONFIG_USER_ONLY
 205     cc->do_unaligned_access = xtensa_cpu_do_unaligned_access;
 206     cc->get_phys_page_debug = xtensa_cpu_get_phys_page_debug;
 207     cc->do_transaction_failed = xtensa_cpu_do_transaction_failed;
 208 #endif
 209     cc->debug_excp_handler = xtensa_breakpoint_handler;
 210     cc->disas_set_info = xtensa_cpu_disas_set_info;
 211     cc->tcg_initialize = xtensa_translate_init;
 212     dc->vmsd = &vmstate_xtensa_cpu;
 213 }
 214
 215 static const TypeInfo xtensa_cpu_type_info = {
 216     .name = TYPE_XTENSA_CPU,
 217     .parent = TYPE_CPU,
 218     .instance_size = sizeof(XtensaCPU),
 219     .instance_init = xtensa_cpu_initfn,
 220     .abstract = true,
 221     .class_size = sizeof(XtensaCPUClass),
 222     .class_init = xtensa_cpu_class_init,
 223 };
 224
 225 static void xtensa_cpu_register_types(void)
 226 {
 227     type_register_static(&xtensa_cpu_type_info);
 228 }
 229
 230 type_init(xtensa_cpu_register_types)