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 #include "exec/exec-all.h"
  29
  30 static void tilegx_cpu_dump_state(CPUState *cs, FILE *f,
  31                                   fprintf_function cpu_fprintf, int flags)
  32 {
  33     static const char * const reg_names[TILEGX_R_COUNT] = {
  34          "r0",  "r1",  "r2",  "r3",  "r4",  "r5",  "r6",  "r7",
  35          "r8",  "r9", "r10", "r11", "r12", "r13", "r14", "r15",
  36         "r16", "r17", "r18", "r19", "r20", "r21", "r22", "r23",
  37         "r24", "r25", "r26", "r27", "r28", "r29", "r30", "r31",
  38         "r32", "r33", "r34", "r35", "r36", "r37", "r38", "r39",
  39         "r40", "r41", "r42", "r43", "r44", "r45", "r46", "r47",
  40         "r48", "r49", "r50", "r51",  "bp",  "tp",  "sp",  "lr"
  41     };
  42
  43     TileGXCPU *cpu = TILEGX_CPU(cs);
  44     CPUTLGState *env = &cpu->env;
  45     int i;
  46
  47     for (i = 0; i < TILEGX_R_COUNT; i++) {
  48         cpu_fprintf(f, "%-4s" TARGET_FMT_lx "%s",
  49                     reg_names[i], env->regs[i],
  50                     (i % 4) == 3 ? "\n" : " ");
  51     }
  52     cpu_fprintf(f, "PC  " TARGET_FMT_lx " CEX " TARGET_FMT_lx "\n\n",
  53                 env->pc, env->spregs[TILEGX_SPR_CMPEXCH]);
  54 }
  55
  56 TileGXCPU *cpu_tilegx_init(const char *cpu_model)
  57 {
  58     TileGXCPU *cpu;
  59
  60     cpu = TILEGX_CPU(object_new(TYPE_TILEGX_CPU));
  61
  62     object_property_set_bool(OBJECT(cpu), true, "realized", NULL);
  63
  64     return cpu;
  65 }
  66
  67 static void tilegx_cpu_set_pc(CPUState *cs, vaddr value)
  68 {
  69     TileGXCPU *cpu = TILEGX_CPU(cs);
  70
  71     cpu->env.pc = value;
  72 }
  73
  74 static bool tilegx_cpu_has_work(CPUState *cs)
  75 {
  76     return true;
  77 }
  78
  79 static void tilegx_cpu_reset(CPUState *s)
  80 {
  81     TileGXCPU *cpu = TILEGX_CPU(s);
  82     TileGXCPUClass *tcc = TILEGX_CPU_GET_CLASS(cpu);
  83     CPUTLGState *env = &cpu->env;
  84
  85     tcc->parent_reset(s);
  86
  87     memset(env, 0, sizeof(CPUTLGState));
  88     tlb_flush(s, 1);
  89 }
  90
  91 static void tilegx_cpu_realizefn(DeviceState *dev, Error **errp)
  92 {
  93     CPUState *cs = CPU(dev);
  94     TileGXCPUClass *tcc = TILEGX_CPU_GET_CLASS(dev);
  95
  96     cpu_reset(cs);
  97     qemu_init_vcpu(cs);
  98
  99     tcc->parent_realize(dev, errp);
 100 }
 101
 102 static void tilegx_cpu_initfn(Object *obj)
 103 {
 104     CPUState *cs = CPU(obj);
 105     TileGXCPU *cpu = TILEGX_CPU(obj);
 106     CPUTLGState *env = &cpu->env;
 107     static bool tcg_initialized;
 108
 109     cs->env_ptr = env;
 110     cpu_exec_init(cs, &error_abort);
 111
 112     if (tcg_enabled() && !tcg_initialized) {
 113         tcg_initialized = true;
 114         tilegx_tcg_init();
 115     }
 116 }
 117
 118 static void tilegx_cpu_do_interrupt(CPUState *cs)
 119 {
 120     cs->exception_index = -1;
 121 }
 122
 123 static int tilegx_cpu_handle_mmu_fault(CPUState *cs, vaddr address, int rw,
 124                                        int mmu_idx)
 125 {
 126     TileGXCPU *cpu = TILEGX_CPU(cs);
 127
 128     /* The sigcode field will be filled in by do_signal in main.c.  */
 129     cs->exception_index = TILEGX_EXCP_SIGNAL;
 130     cpu->env.excaddr = address;
 131     cpu->env.signo = TARGET_SIGSEGV;
 132     cpu->env.sigcode = 0;
 133
 134     return 1;
 135 }
 136
 137 static bool tilegx_cpu_exec_interrupt(CPUState *cs, int interrupt_request)
 138 {
 139     if (interrupt_request & CPU_INTERRUPT_HARD) {
 140         tilegx_cpu_do_interrupt(cs);
 141         return true;
 142     }
 143     return false;
 144 }
 145
 146 static void tilegx_cpu_class_init(ObjectClass *oc, void *data)
 147 {
 148     DeviceClass *dc = DEVICE_CLASS(oc);
 149     CPUClass *cc = CPU_CLASS(oc);
 150     TileGXCPUClass *tcc = TILEGX_CPU_CLASS(oc);
 151
 152     tcc->parent_realize = dc->realize;
 153     dc->realize = tilegx_cpu_realizefn;
 154
 155     tcc->parent_reset = cc->reset;
 156     cc->reset = tilegx_cpu_reset;
 157
 158     cc->has_work = tilegx_cpu_has_work;
 159     cc->do_interrupt = tilegx_cpu_do_interrupt;
 160     cc->cpu_exec_interrupt = tilegx_cpu_exec_interrupt;
 161     cc->dump_state = tilegx_cpu_dump_state;
 162     cc->set_pc = tilegx_cpu_set_pc;
 163     cc->handle_mmu_fault = tilegx_cpu_handle_mmu_fault;
 164     cc->gdb_num_core_regs = 0;
 165
 166     /*
 167      * Reason: tilegx_cpu_initfn() calls cpu_exec_init(), which saves
 168      * the object in cpus -> dangling pointer after final
 169      * object_unref().
 170      */
 171     dc->cannot_destroy_with_object_finalize_yet = true;
 172 }
 173
 174 static const TypeInfo tilegx_cpu_type_info = {
 175     .name = TYPE_TILEGX_CPU,
 176     .parent = TYPE_CPU,
 177     .instance_size = sizeof(TileGXCPU),
 178     .instance_init = tilegx_cpu_initfn,
 179     .class_size = sizeof(TileGXCPUClass),
 180     .class_init = tilegx_cpu_class_init,
 181 };
 182
 183 static void tilegx_cpu_register_types(void)
 184 {
 185     type_register_static(&tilegx_cpu_type_info);
 186 }
 187
 188 type_init(tilegx_cpu_register_types)