sim/or1k/sim-if.c

   1 /* Main simulator entry points specific to the OR1K.
   2    Copyright (C) 2017-2021 Free Software Foundation, Inc.
   3
   4    This file is part of GDB, the GNU debugger.
   5
   6    This program is free software; you can redistribute it and/or modify
   7    it under the terms of the GNU General Public License as published by
   8    the Free Software Foundation; either version 3 of the License, or
   9    (at your option) any later version.
  10
  11    This program 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
  14    GNU General Public License for more details.
  15
  16    You should have received a copy of the GNU General Public License
  17    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  18
  19 /* This must come before any other includes.  */
  20 #include "defs.h"
  21
  22 #include "sim-main.h"
  23 #include "sim-options.h"
  24 #include "libiberty.h"
  25 #include "bfd.h"
  26
  27 #include <string.h>
  28 #include <stdlib.h>
  29
  30 static void free_state (SIM_DESC);
  31 \f
  32
  33 /* Cover function of sim_state_free to free the cpu buffers as well.  */
  34
  35 static void
  36 free_state (SIM_DESC sd)
  37 {
  38   if (STATE_MODULES (sd) != NULL)
  39     sim_module_uninstall (sd);
  40   sim_cpu_free_all (sd);
  41   sim_state_free (sd);
  42 }
  43
  44 /* Defaults for user passed arguments.  */
  45 static const USI or1k_default_vr = 0x0;
  46 static const USI or1k_default_upr = 0x0
  47   | SPR_FIELD_MASK_SYS_UPR_UP;
  48 static const USI or1k_default_cpucfgr = 0x0
  49   | SPR_FIELD_MASK_SYS_CPUCFGR_OB32S
  50   | SPR_FIELD_MASK_SYS_CPUCFGR_OF32S;
  51
  52 static UWI or1k_upr;
  53 static UWI or1k_vr;
  54 static UWI or1k_cpucfgr;
  55
  56 enum
  57 {
  58   OPTION_OR1K_VR,
  59   OPTION_OR1K_UPR,
  60   OPTION_OR1K_CPUCFGR = OPTION_START,
  61 };
  62
  63 /* Setup help and handlers for the user defined arguments.  */
  64 DECLARE_OPTION_HANDLER (or1k_option_handler);
  65
  66 static const OPTION or1k_options[] = {
  67   {{"or1k-cpucfgr", required_argument, NULL, OPTION_OR1K_CPUCFGR},
  68    '\0', "INTEGER|default", "Set simulator CPUCFGR value",
  69    or1k_option_handler},
  70   {{"or1k-vr", required_argument, NULL, OPTION_OR1K_VR},
  71    '\0', "INTEGER|default", "Set simulator VR value",
  72    or1k_option_handler},
  73   {{"or1k-upr", required_argument, NULL, OPTION_OR1K_UPR},
  74    '\0', "INTEGER|default", "Set simulator UPR value",
  75    or1k_option_handler},
  76   {{NULL, no_argument, NULL, 0}, '\0', NULL, NULL, NULL}
  77 };
  78
  79 /* Handler for parsing user defined arguments.  Currently we support
  80    configuring some of the CPU implementation specific registers including
  81    the Version Register (VR), the Unit Present Register (UPR) and the CPU
  82    Configuration Register (CPUCFGR).  */
  83 SIM_RC
  84 or1k_option_handler (SIM_DESC sd, sim_cpu *cpu, int opt, char *arg,
  85                      int is_command)
  86 {
  87   switch (opt)
  88     {
  89     case OPTION_OR1K_VR:
  90       if (strcmp ("default", arg) == 0)
  91         or1k_vr = or1k_default_vr;
  92       else
  93         {
  94           unsigned long long n;
  95           char *endptr;
  96
  97           n = strtoull (arg, &endptr, 0);
  98           if (*arg != '\0' && *endptr == '\0')
  99             or1k_vr = n;
 100           else
 101             return SIM_RC_FAIL;
 102         }
 103       return SIM_RC_OK;
 104
 105     case OPTION_OR1K_UPR:
 106       if (strcmp ("default", arg) == 0)
 107         or1k_upr = or1k_default_upr;
 108       else
 109         {
 110           unsigned long long n;
 111           char *endptr;
 112
 113           n = strtoull (arg, &endptr, 0);
 114           if (*arg != '\0' && *endptr == '\0')
 115             or1k_upr = n;
 116           else
 117             {
 118               sim_io_eprintf
 119                 (sd, "invalid argument to option --or1k-upr: `%s'\n", arg);
 120               return SIM_RC_FAIL;
 121             }
 122         }
 123       return SIM_RC_OK;
 124
 125     case OPTION_OR1K_CPUCFGR:
 126       if (strcmp ("default", arg) == 0)
 127         or1k_cpucfgr = or1k_default_cpucfgr;
 128       else
 129         {
 130           unsigned long long n;
 131           char *endptr;
 132
 133           n = strtoull (arg, &endptr, 0);
 134           if (*arg != '\0' && *endptr == '\0')
 135             or1k_cpucfgr = n;
 136           else
 137             {
 138               sim_io_eprintf
 139                 (sd, "invalid argument to option --or1k-cpucfgr: `%s'\n", arg);
 140               return SIM_RC_FAIL;
 141             }
 142         }
 143       return SIM_RC_OK;
 144
 145     default:
 146       sim_io_eprintf (sd, "Unknown or1k option %d\n", opt);
 147       return SIM_RC_FAIL;
 148     }
 149
 150   return SIM_RC_FAIL;
 151 }
 152
 153 extern const SIM_MACH * const or1k_sim_machs[];
 154
 155 /* Create an instance of the simulator.  */
 156
 157 SIM_DESC
 158 sim_open (SIM_OPEN_KIND kind, host_callback *callback, struct bfd *abfd,
 159           char * const *argv)
 160 {
 161   SIM_DESC sd = sim_state_alloc (kind, callback);
 162   char c;
 163   int i;
 164
 165   /* Set default options before parsing user options.  */
 166   STATE_MACHS (sd) = or1k_sim_machs;
 167   STATE_MODEL_NAME (sd) = "or1200";
 168   current_target_byte_order = BFD_ENDIAN_BIG;
 169
 170   /* The cpu data is kept in a separately allocated chunk of memory.  */
 171   if (sim_cpu_alloc_all (sd, 1) != SIM_RC_OK)
 172     {
 173       free_state (sd);
 174       return 0;
 175     }
 176
 177   /* Perform initial sim setups.  */
 178   if (sim_pre_argv_init (sd, argv[0]) != SIM_RC_OK)
 179     {
 180       free_state (sd);
 181       return 0;
 182     }
 183
 184   or1k_upr = or1k_default_upr;
 185   or1k_vr = or1k_default_vr;
 186   or1k_cpucfgr = or1k_default_cpucfgr;
 187   sim_add_option_table (sd, NULL, or1k_options);
 188
 189   /* Parse the user passed arguments.  */
 190   if (sim_parse_args (sd, argv) != SIM_RC_OK)
 191     {
 192       free_state (sd);
 193       return 0;
 194     }
 195
 196   /* Allocate core managed memory if none specified by user.
 197      Use address 4 here in case the user wanted address 0 unmapped.  */
 198   if (sim_core_read_buffer (sd, NULL, read_map, &c, 4, 1) == 0)
 199     {
 200       sim_do_commandf (sd, "memory region 0,0x%x", OR1K_DEFAULT_MEM_SIZE);
 201     }
 202
 203   /* Check for/establish the reference program image.  */
 204   if (sim_analyze_program (sd,
 205                            (STATE_PROG_ARGV (sd) != NULL
 206                             ? *STATE_PROG_ARGV (sd)
 207                             : NULL), abfd) != SIM_RC_OK)
 208     {
 209       free_state (sd);
 210       return 0;
 211     }
 212
 213   /* Establish any remaining configuration options.  */
 214   if (sim_config (sd) != SIM_RC_OK)
 215     {
 216       free_state (sd);
 217       return 0;
 218     }
 219
 220   if (sim_post_argv_init (sd) != SIM_RC_OK)
 221     {
 222       free_state (sd);
 223       return 0;
 224     }
 225
 226   /* Make sure delay slot mode is consistent with the loaded binary.  */
 227   if (STATE_ARCHITECTURE (sd)->mach == bfd_mach_or1knd)
 228     or1k_cpucfgr |= SPR_FIELD_MASK_SYS_CPUCFGR_ND;
 229   else
 230     or1k_cpucfgr &= ~SPR_FIELD_MASK_SYS_CPUCFGR_ND;
 231
 232   /* Open a copy of the cpu descriptor table and initialize the
 233      disassembler.  These initialization functions are generated by CGEN
 234      using the binutils scheme cpu description files.  */
 235   {
 236     CGEN_CPU_DESC cd =
 237       or1k_cgen_cpu_open_1 (STATE_ARCHITECTURE (sd)->printable_name,
 238                             CGEN_ENDIAN_BIG);
 239     for (i = 0; i < MAX_NR_PROCESSORS; ++i)
 240       {
 241         SIM_CPU *cpu = STATE_CPU (sd, i);
 242         CPU_CPU_DESC (cpu) = cd;
 243         CPU_DISASSEMBLER (cpu) = sim_cgen_disassemble_insn;
 244       }
 245     or1k_cgen_init_dis (cd);
 246   }
 247
 248   /* Do some final OpenRISC sim specific initializations.  */
 249   for (c = 0; c < MAX_NR_PROCESSORS; ++c)
 250     {
 251       SIM_CPU *cpu = STATE_CPU (sd, i);
 252       /* Only needed for profiling, but the structure member is small.  */
 253       memset (CPU_OR1K_MISC_PROFILE (cpu), 0,
 254               sizeof (*CPU_OR1K_MISC_PROFILE (cpu)));
 255
 256       or1k_cpu_init (sd, cpu, or1k_vr, or1k_upr, or1k_cpucfgr);
 257     }
 258
 259   return sd;
 260 }
 261 \f
 262
 263 SIM_RC
 264 sim_create_inferior (SIM_DESC sd, struct bfd *abfd,
 265                      char * const *argv, char * const *envp)
 266 {
 267   SIM_CPU *current_cpu = STATE_CPU (sd, 0);
 268   SIM_ADDR addr;
 269
 270   if (abfd != NULL)
 271     addr = bfd_get_start_address (abfd);
 272   else
 273     addr = 0;
 274   sim_pc_set (current_cpu, addr);
 275
 276   return SIM_RC_OK;
 277 }