target-tilegx/cpu.c

   1 /*
   2  * QEMU TILE-Gx CPU
   3  *
   4  *  Copyright (c) 2015 Chen Gang
   5  *
   6  * This library is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU Lesser General Public
   8  * License as published by the Free Software Foundation; either
   9  * version 2.1 of the License, or (at your option) any later version.
  10  *
  11  * This library is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * Lesser General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Lesser General Public
  17  * License along with this library; if not, see
  18  * <http://www.gnu.org/licenses/lgpl-2.1.html>
  19  */
  20
  21 #include "qemu/osdep.h"
  22 #include "qapi/error.h"
  23 #include "cpu.h"
  24 #include "qemu-common.h"
  25 #include "hw/qdev-properties.h"
  26 #include "migration/vmstate.h"
  27 #include "linux-user/syscall_defs.h"
  28
  29 static void tilegx_cpu_dump_state(CPUState *cs, FILE *f,
  30                                   fprintf_function cpu_fprintf, int flags)
  31 {
  32     static const char * const reg_names[TILEGX_R_COUNT] = {
  33          "r0",  "r1",  "r2",  "r3",  "r4",  "r5",  "r6",  "r7",
  34          "r8",  "r9", "r10", "r11", "r12", "r13", "r14", "r15",
  35         "r16", "r17", "r18", "r19", "r20", "r21", "r22", "r23",
  36         "r24", "r25", "r26", "r27", "r28", "r29", "r30", "r31",
  37         "r32", "r33", "r34", "r35", "r36", "r37", "r38", "r39",
  38         "r40", "r41", "r42", "r43", "r44", "r45", "r46", "r47",
  39         "r48", "r49", "r50", "r51",  "bp",  "tp",  "sp",  "lr"
  40     };
  41
  42     TileGXCPU *cpu = TILEGX_CPU(cs);
  43     CPUTLGState *env = &cpu->env;
  44     int i;
  45
  46     for (i = 0; i < TILEGX_R_COUNT; i++) {
  47         cpu_fprintf(f, "%-4s" TARGET_FMT_lx "%s",
  48                     reg_names[i], env->regs[i],
  49                     (i % 4) == 3 ? "\n" : " ");
  50     }
  51     cpu_fprintf(f, "PC  " TARGET_FMT_lx " CEX " TARGET_FMT_lx "\n\n",
  52                 env->pc, env->spregs[TILEGX_SPR_CMPEXCH]);
  53 }
  54
  55 TileGXCPU *cpu_tilegx_init(const char *cpu_model)
  56 {
  57     TileGXCPU *cpu;
  58
  59     cpu = TILEGX_CPU(object_new(TYPE_TILEGX_CPU));
  60
  61     object_property_set_bool(OBJECT(cpu), true, "realized", NULL);
  62
  63     return cpu;
  64 }
  65
  66 static void tilegx_cpu_set_pc(CPUState *cs, vaddr value)
  67 {
  68     TileGXCPU *cpu = TILEGX_CPU(cs);
  69
  70     cpu->env.pc = value;
  71 }
  72
  73 static bool tilegx_cpu_has_work(CPUState *cs)
  74 {
  75     return true;
  76 }
  77
  78 static void tilegx_cpu_reset(CPUState *s)
  79 {
  80     TileGXCPU *cpu = TILEGX_CPU(s);
  81     TileGXCPUClass *tcc = TILEGX_CPU_GET_CLASS(cpu);
  82     CPUTLGState *env = &cpu->env;
  83
  84     tcc->parent_reset(s);
  85
  86     memset(env, 0, sizeof(CPUTLGState));
  87     tlb_flush(s, 1);
  88 }
  89
  90 static void tilegx_cpu_realizefn(DeviceState *dev, Error **errp)
  91 {
  92     CPUState *cs = CPU(dev);
  93     TileGXCPUClass *tcc = TILEGX_CPU_GET_CLASS(dev);
  94
  95     cpu_reset(cs);
  96     qemu_init_vcpu(cs);
  97
  98     tcc->parent_realize(dev, errp);
  99 }
 100
 101 static void tilegx_cpu_initfn(Object *obj)
 102 {
 103     CPUState *cs = CPU(obj);
 104     TileGXCPU *cpu = TILEGX_CPU(obj);
 105     CPUTLGState *env = &cpu->env;
 106     static bool tcg_initialized;
 107
 108     cs->env_ptr = env;
 109     cpu_exec_init(cs, &error_abort);
 110
 111     if (tcg_enabled() && !tcg_initialized) {
 112         tcg_initialized = true;
 113         tilegx_tcg_init();
 114     }
 115 }
 116
 117 static void tilegx_cpu_do_interrupt(CPUState *cs)
 118 {
 119     cs->exception_index = -1;
 120 }
 121
 122 static int tilegx_cpu_handle_mmu_fault(CPUState *cs, vaddr address, int rw,
 123                                        int mmu_idx)
 124 {
 125     TileGXCPU *cpu = TILEGX_CPU(cs);
 126
 127     /* The sigcode field will be filled in by do_signal in main.c.  */
 128     cs->exception_index = TILEGX_EXCP_SIGNAL;
 129     cpu->env.excaddr = address;
 130     cpu->env.signo = TARGET_SIGSEGV;
 131     cpu->env.sigcode = 0;
 132
 133     return 1;
 134 }
 135
 136 static bool tilegx_cpu_exec_interrupt(CPUState *cs, int interrupt_request)
 137 {
 138     if (interrupt_request & CPU_INTERRUPT_HARD) {
 139         tilegx_cpu_do_interrupt(cs);
 140         return true;
 141     }
 142     return false;
 143 }
 144
 145 static void tilegx_cpu_class_init(ObjectClass *oc, void *data)
 146 {
 147     DeviceClass *dc = DEVICE_CLASS(oc);
 148     CPUClass *cc = CPU_CLASS(oc);
 149     TileGXCPUClass *tcc = TILEGX_CPU_CLASS(oc);
 150
 151     tcc->parent_realize = dc->realize;
 152     dc->realize = tilegx_cpu_realizefn;
 153
 154     tcc->parent_reset = cc->reset;
 155     cc->reset = tilegx_cpu_reset;
 156
 157     cc->has_work = tilegx_cpu_has_work;
 158     cc->do_interrupt = tilegx_cpu_do_interrupt;
 159     cc->cpu_exec_interrupt = tilegx_cpu_exec_interrupt;
 160     cc->dump_state = tilegx_cpu_dump_state;
 161     cc->set_pc = tilegx_cpu_set_pc;
 162     cc->handle_mmu_fault = tilegx_cpu_handle_mmu_fault;
 163     cc->gdb_num_core_regs = 0;
 164
 165     /*
 166      * Reason: tilegx_cpu_initfn() calls cpu_exec_init(), which saves
 167      * the object in cpus -> dangling pointer after final
 168      * object_unref().
 169      */
 170     dc->cannot_destroy_with_object_finalize_yet = true;
 171 }
 172
 173 static const TypeInfo tilegx_cpu_type_info = {
 174     .name = TYPE_TILEGX_CPU,
 175     .parent = TYPE_CPU,
 176     .instance_size = sizeof(TileGXCPU),
 177     .instance_init = tilegx_cpu_initfn,
 178     .class_size = sizeof(TileGXCPUClass),
 179     .class_init = tilegx_cpu_class_init,
 180 };
 181
 182 static void tilegx_cpu_register_types(void)
 183 {
 184     type_register_static(&tilegx_cpu_type_info);
 185 }
 186
 187 type_init(tilegx_cpu_register_types)