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(CPUState *s)
  72 {
  73     TileGXCPU *cpu = TILEGX_CPU(s);
  74     TileGXCPUClass *tcc = TILEGX_CPU_GET_CLASS(cpu);
  75     CPUTLGState *env = &cpu->env;
  76
  77     tcc->parent_reset(s);
  78
  79     memset(env, 0, offsetof(CPUTLGState, end_reset_fields));
  80 }
  81
  82 static void tilegx_cpu_realizefn(DeviceState *dev, Error **errp)
  83 {
  84     CPUState *cs = CPU(dev);
  85     TileGXCPUClass *tcc = TILEGX_CPU_GET_CLASS(dev);
  86     Error *local_err = NULL;
  87
  88     cpu_exec_realizefn(cs, &local_err);
  89     if (local_err != NULL) {
  90         error_propagate(errp, local_err);
  91         return;
  92     }
  93
  94     cpu_reset(cs);
  95     qemu_init_vcpu(cs);
  96
  97     tcc->parent_realize(dev, errp);
  98 }
  99
 100 static void tilegx_cpu_initfn(Object *obj)
 101 {
 102     TileGXCPU *cpu = TILEGX_CPU(obj);
 103
 104     cpu_set_cpustate_pointers(cpu);
 105 }
 106
 107 static void tilegx_cpu_do_interrupt(CPUState *cs)
 108 {
 109     cs->exception_index = -1;
 110 }
 111
 112 static bool tilegx_cpu_tlb_fill(CPUState *cs, vaddr address, int size,
 113                                 MMUAccessType access_type, int mmu_idx,
 114                                 bool probe, uintptr_t retaddr)
 115 {
 116     TileGXCPU *cpu = TILEGX_CPU(cs);
 117
 118     /* The sigcode field will be filled in by do_signal in main.c.  */
 119     cs->exception_index = TILEGX_EXCP_SIGNAL;
 120     cpu->env.excaddr = address;
 121     cpu->env.signo = TARGET_SIGSEGV;
 122     cpu->env.sigcode = 0;
 123
 124     cpu_loop_exit_restore(cs, retaddr);
 125 }
 126
 127 static bool tilegx_cpu_exec_interrupt(CPUState *cs, int interrupt_request)
 128 {
 129     if (interrupt_request & CPU_INTERRUPT_HARD) {
 130         tilegx_cpu_do_interrupt(cs);
 131         return true;
 132     }
 133     return false;
 134 }
 135
 136 static void tilegx_cpu_class_init(ObjectClass *oc, void *data)
 137 {
 138     DeviceClass *dc = DEVICE_CLASS(oc);
 139     CPUClass *cc = CPU_CLASS(oc);
 140     TileGXCPUClass *tcc = TILEGX_CPU_CLASS(oc);
 141
 142     device_class_set_parent_realize(dc, tilegx_cpu_realizefn,
 143                                     &tcc->parent_realize);
 144
 145     cpu_class_set_parent_reset(cc, tilegx_cpu_reset, &tcc->parent_reset);
 146
 147     cc->class_by_name = tilegx_cpu_class_by_name;
 148     cc->has_work = tilegx_cpu_has_work;
 149     cc->do_interrupt = tilegx_cpu_do_interrupt;
 150     cc->cpu_exec_interrupt = tilegx_cpu_exec_interrupt;
 151     cc->dump_state = tilegx_cpu_dump_state;
 152     cc->set_pc = tilegx_cpu_set_pc;
 153     cc->tlb_fill = tilegx_cpu_tlb_fill;
 154     cc->gdb_num_core_regs = 0;
 155     cc->tcg_initialize = tilegx_tcg_init;
 156 }
 157
 158 static const TypeInfo tilegx_cpu_type_info = {
 159     .name = TYPE_TILEGX_CPU,
 160     .parent = TYPE_CPU,
 161     .instance_size = sizeof(TileGXCPU),
 162     .instance_init = tilegx_cpu_initfn,
 163     .class_size = sizeof(TileGXCPUClass),
 164     .class_init = tilegx_cpu_class_init,
 165 };
 166
 167 static void tilegx_cpu_register_types(void)
 168 {
 169     type_register_static(&tilegx_cpu_type_info);
 170 }
 171
 172 type_init(tilegx_cpu_register_types)