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/module.h"
  25 #include "linux-user/syscall_defs.h"
  26 #include "qemu/qemu-print.h"
  27 #include "exec/exec-all.h"
  28
  29 static void tilegx_cpu_dump_state(CPUState *cs, FILE *f, int flags)
  30 {
  31     static const char * const reg_names[TILEGX_R_COUNT] = {
  32          "r0",  "r1",  "r2",  "r3",  "r4",  "r5",  "r6",  "r7",
  33          "r8",  "r9", "r10", "r11", "r12", "r13", "r14", "r15",
  34         "r16", "r17", "r18", "r19", "r20", "r21", "r22", "r23",
  35         "r24", "r25", "r26", "r27", "r28", "r29", "r30", "r31",
  36         "r32", "r33", "r34", "r35", "r36", "r37", "r38", "r39",
  37         "r40", "r41", "r42", "r43", "r44", "r45", "r46", "r47",
  38         "r48", "r49", "r50", "r51",  "bp",  "tp",  "sp",  "lr"
  39     };
  40
  41     TileGXCPU *cpu = TILEGX_CPU(cs);
  42     CPUTLGState *env = &cpu->env;
  43     int i;
  44
  45     for (i = 0; i < TILEGX_R_COUNT; i++) {
  46         qemu_fprintf(f, "%-4s" TARGET_FMT_lx "%s",
  47                      reg_names[i], env->regs[i],
  48                      (i % 4) == 3 ? "\n" : " ");
  49     }
  50     qemu_fprintf(f, "PC  " TARGET_FMT_lx " CEX " TARGET_FMT_lx "\n\n",
  51                  env->pc, env->spregs[TILEGX_SPR_CMPEXCH]);
  52 }
  53
  54 static ObjectClass *tilegx_cpu_class_by_name(const char *cpu_model)
  55 {
  56     return object_class_by_name(TYPE_TILEGX_CPU);
  57 }
  58
  59 static void tilegx_cpu_set_pc(CPUState *cs, vaddr value)
  60 {
  61     TileGXCPU *cpu = TILEGX_CPU(cs);
  62
  63     cpu->env.pc = value;
  64 }
  65
  66 static bool tilegx_cpu_has_work(CPUState *cs)
  67 {
  68     return true;
  69 }
  70
  71 static void tilegx_cpu_reset(DeviceState *dev)
  72 {
  73     CPUState *s = CPU(dev);
  74     TileGXCPU *cpu = TILEGX_CPU(s);
  75     TileGXCPUClass *tcc = TILEGX_CPU_GET_CLASS(cpu);
  76     CPUTLGState *env = &cpu->env;
  77
  78     tcc->parent_reset(dev);
  79
  80     memset(env, 0, offsetof(CPUTLGState, end_reset_fields));
  81 }
  82
  83 static void tilegx_cpu_realizefn(DeviceState *dev, Error **errp)
  84 {
  85     CPUState *cs = CPU(dev);
  86     TileGXCPUClass *tcc = TILEGX_CPU_GET_CLASS(dev);
  87     Error *local_err = NULL;
  88
  89     cpu_exec_realizefn(cs, &local_err);
  90     if (local_err != NULL) {
  91         error_propagate(errp, local_err);
  92         return;
  93     }
  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     TileGXCPU *cpu = TILEGX_CPU(obj);
 104
 105     cpu_set_cpustate_pointers(cpu);
 106 }
 107
 108 static void tilegx_cpu_do_interrupt(CPUState *cs)
 109 {
 110     cs->exception_index = -1;
 111 }
 112
 113 static bool tilegx_cpu_tlb_fill(CPUState *cs, vaddr address, int size,
 114                                 MMUAccessType access_type, int mmu_idx,
 115                                 bool probe, uintptr_t retaddr)
 116 {
 117     TileGXCPU *cpu = TILEGX_CPU(cs);
 118
 119     /* The sigcode field will be filled in by do_signal in main.c.  */
 120     cs->exception_index = TILEGX_EXCP_SIGNAL;
 121     cpu->env.excaddr = address;
 122     cpu->env.signo = TARGET_SIGSEGV;
 123     cpu->env.sigcode = 0;
 124
 125     cpu_loop_exit_restore(cs, retaddr);
 126 }
 127
 128 static bool tilegx_cpu_exec_interrupt(CPUState *cs, int interrupt_request)
 129 {
 130     if (interrupt_request & CPU_INTERRUPT_HARD) {
 131         tilegx_cpu_do_interrupt(cs);
 132         return true;
 133     }
 134     return false;
 135 }
 136
 137 static void tilegx_cpu_class_init(ObjectClass *oc, void *data)
 138 {
 139     DeviceClass *dc = DEVICE_CLASS(oc);
 140     CPUClass *cc = CPU_CLASS(oc);
 141     TileGXCPUClass *tcc = TILEGX_CPU_CLASS(oc);
 142
 143     device_class_set_parent_realize(dc, tilegx_cpu_realizefn,
 144                                     &tcc->parent_realize);
 145
 146     device_class_set_parent_reset(dc, tilegx_cpu_reset, &tcc->parent_reset);
 147
 148     cc->class_by_name = tilegx_cpu_class_by_name;
 149     cc->has_work = tilegx_cpu_has_work;
 150     cc->do_interrupt = tilegx_cpu_do_interrupt;
 151     cc->cpu_exec_interrupt = tilegx_cpu_exec_interrupt;
 152     cc->dump_state = tilegx_cpu_dump_state;
 153     cc->set_pc = tilegx_cpu_set_pc;
 154     cc->tlb_fill = tilegx_cpu_tlb_fill;
 155     cc->gdb_num_core_regs = 0;
 156     cc->tcg_initialize = tilegx_tcg_init;
 157 }
 158
 159 static const TypeInfo tilegx_cpu_type_info = {
 160     .name = TYPE_TILEGX_CPU,
 161     .parent = TYPE_CPU,
 162     .instance_size = sizeof(TileGXCPU),
 163     .instance_init = tilegx_cpu_initfn,
 164     .class_size = sizeof(TileGXCPUClass),
 165     .class_init = tilegx_cpu_class_init,
 166 };
 167
 168 static void tilegx_cpu_register_types(void)
 169 {
 170     type_register_static(&tilegx_cpu_type_info);
 171 }
 172
 173 type_init(tilegx_cpu_register_types)