target-xtensa/helper.c

   1 /*
   2  * Copyright (c) 2011, Max Filippov, Open Source and Linux Lab.
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions are met:
   7  *     * Redistributions of source code must retain the above copyright
   8  *       notice, this list of conditions and the following disclaimer.
   9  *     * Redistributions in binary form must reproduce the above copyright
  10  *       notice, this list of conditions and the following disclaimer in the
  11  *       documentation and/or other materials provided with the distribution.
  12  *     * Neither the name of the Open Source and Linux Lab nor the
  13  *       names of its contributors may be used to endorse or promote products
  14  *       derived from this software without specific prior written permission.
  15  *
  16  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
  17  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  18  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  19  * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
  20  * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
  21  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  22  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
  23  * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  24  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  25  * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  26  */
  27
  28 #include "cpu.h"
  29 #include "exec-all.h"
  30 #include "gdbstub.h"
  31 #include "qemu-common.h"
  32 #include "host-utils.h"
  33 #if !defined(CONFIG_USER_ONLY)
  34 #include "hw/loader.h"
  35 #endif
  36
  37 void cpu_reset(CPUXtensaState *env)
  38 {
  39     env->exception_taken = 0;
  40     env->pc = env->config->exception_vector[EXC_RESET];
  41     env->sregs[LITBASE] &= ~1;
  42     env->sregs[PS] = 0x1f;
  43 }
  44
  45 static const XtensaConfig core_config[] = {
  46     {
  47         .name = "sample-xtensa-core",
  48         .options = -1 ^
  49             (XTENSA_OPTION_BIT(XTENSA_OPTION_HW_ALIGNMENT) |
  50              XTENSA_OPTION_BIT(XTENSA_OPTION_MMU)),
  51         .nareg = 64,
  52         .ndepc = 1,
  53         .excm_level = 16,
  54         .exception_vector = {
  55             [EXC_RESET] = 0x5fff8000,
  56             [EXC_WINDOW_OVERFLOW4] = 0x5fff8400,
  57             [EXC_WINDOW_UNDERFLOW4] = 0x5fff8440,
  58             [EXC_WINDOW_OVERFLOW8] = 0x5fff8480,
  59             [EXC_WINDOW_UNDERFLOW8] = 0x5fff84c0,
  60             [EXC_WINDOW_OVERFLOW12] = 0x5fff8500,
  61             [EXC_WINDOW_UNDERFLOW12] = 0x5fff8540,
  62             [EXC_KERNEL] = 0x5fff861c,
  63             [EXC_USER] = 0x5fff863c,
  64             [EXC_DOUBLE] = 0x5fff865c,
  65         },
  66     },
  67 };
  68
  69 CPUXtensaState *cpu_xtensa_init(const char *cpu_model)
  70 {
  71     static int tcg_inited;
  72     CPUXtensaState *env;
  73     const XtensaConfig *config = NULL;
  74     int i;
  75
  76     for (i = 0; i < ARRAY_SIZE(core_config); ++i)
  77         if (strcmp(core_config[i].name, cpu_model) == 0) {
  78             config = core_config + i;
  79             break;
  80         }
  81
  82     if (config == NULL) {
  83         return NULL;
  84     }
  85
  86     env = g_malloc0(sizeof(*env));
  87     env->config = config;
  88     cpu_exec_init(env);
  89
  90     if (!tcg_inited) {
  91         tcg_inited = 1;
  92         xtensa_translate_init();
  93     }
  94
  95     qemu_init_vcpu(env);
  96     return env;
  97 }
  98
  99
 100 void xtensa_cpu_list(FILE *f, fprintf_function cpu_fprintf)
 101 {
 102     int i;
 103     cpu_fprintf(f, "Available CPUs:\n");
 104     for (i = 0; i < ARRAY_SIZE(core_config); ++i) {
 105         cpu_fprintf(f, "  %s\n", core_config[i].name);
 106     }
 107 }
 108
 109 target_phys_addr_t cpu_get_phys_page_debug(CPUState *env, target_ulong addr)
 110 {
 111     return addr;
 112 }
 113
 114 void do_interrupt(CPUState *env)
 115 {
 116     switch (env->exception_index) {
 117     case EXC_WINDOW_OVERFLOW4:
 118     case EXC_WINDOW_UNDERFLOW4:
 119     case EXC_WINDOW_OVERFLOW8:
 120     case EXC_WINDOW_UNDERFLOW8:
 121     case EXC_WINDOW_OVERFLOW12:
 122     case EXC_WINDOW_UNDERFLOW12:
 123     case EXC_KERNEL:
 124     case EXC_USER:
 125     case EXC_DOUBLE:
 126         if (env->config->exception_vector[env->exception_index]) {
 127             env->pc = env->config->exception_vector[env->exception_index];
 128             env->exception_taken = 1;
 129         } else {
 130             qemu_log("%s(pc = %08x) bad exception_index: %d\n",
 131                     __func__, env->pc, env->exception_index);
 132         }
 133         break;
 134
 135     }
 136 }