sim/lm32/sim-if.c

   1 /* Main simulator entry points specific to Lattice Mico32.
   2    Contributed by Jon Beniston <jon@beniston.com>
   3
   4    Copyright (C) 2009-2017 Free Software Foundation, Inc.
   5
   6    This file is part of GDB.
   7
   8    This program is free software; you can redistribute it and/or modify
   9    it under the terms of the GNU General Public License as published by
  10    the Free Software Foundation; either version 3 of the License, or
  11    (at your option) any later version.
  12
  13    This program is distributed in the hope that it will be useful,
  14    but WITHOUT ANY WARRANTY; without even the implied warranty of
  15    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16    GNU General Public License for more details.
  17
  18    You should have received a copy of the GNU General Public License
  19    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  20
  21 #include "sim-main.h"
  22 #include "sim-options.h"
  23 #include "libiberty.h"
  24 #include "bfd.h"
  25
  26 #ifdef HAVE_STDLIB_H
  27 #include <stdlib.h>
  28 #endif
  29 \f
  30 /* Cover function of sim_state_free to free the cpu buffers as well.  */
  31
  32 static void
  33 free_state (SIM_DESC sd)
  34 {
  35   if (STATE_MODULES (sd) != NULL)
  36     sim_module_uninstall (sd);
  37   sim_cpu_free_all (sd);
  38   sim_state_free (sd);
  39 }
  40
  41 /* Find memory range used by program.  */
  42
  43 static unsigned long
  44 find_base (bfd *prog_bfd)
  45 {
  46   int found;
  47   unsigned long base = ~(0UL);
  48   asection *s;
  49
  50   found = 0;
  51   for (s = prog_bfd->sections; s; s = s->next)
  52     {
  53       if ((strcmp (bfd_get_section_name (prog_bfd, s), ".boot") == 0)
  54           || (strcmp (bfd_get_section_name (prog_bfd, s), ".text") == 0)
  55           || (strcmp (bfd_get_section_name (prog_bfd, s), ".data") == 0)
  56           || (strcmp (bfd_get_section_name (prog_bfd, s), ".bss") == 0))
  57         {
  58           if (!found)
  59             {
  60               base = bfd_get_section_vma (prog_bfd, s);
  61               found = 1;
  62             }
  63           else
  64             base =
  65               bfd_get_section_vma (prog_bfd,
  66                                    s) < base ? bfd_get_section_vma (prog_bfd,
  67                                                                     s) : base;
  68         }
  69     }
  70   return base & ~(0xffffUL);
  71 }
  72
  73 static unsigned long
  74 find_limit (SIM_DESC sd)
  75 {
  76   bfd_vma addr;
  77
  78   addr = trace_sym_value (sd, "_fstack");
  79   if (addr == -1)
  80     return 0;
  81
  82   return (addr + 65536) & ~(0xffffUL);
  83 }
  84
  85 /* Create an instance of the simulator.  */
  86
  87 SIM_DESC
  88 sim_open (kind, callback, abfd, argv)
  89      SIM_OPEN_KIND kind;
  90      host_callback *callback;
  91      struct bfd *abfd;
  92      char * const *argv;
  93 {
  94   SIM_DESC sd = sim_state_alloc (kind, callback);
  95   char c;
  96   int i;
  97   unsigned long base, limit;
  98
  99   /* The cpu data is kept in a separately allocated chunk of memory.  */
 100   if (sim_cpu_alloc_all (sd, 1, cgen_cpu_max_extra_bytes ()) != SIM_RC_OK)
 101     {
 102       free_state (sd);
 103       return 0;
 104     }
 105
 106   if (sim_pre_argv_init (sd, argv[0]) != SIM_RC_OK)
 107     {
 108       free_state (sd);
 109       return 0;
 110     }
 111
 112   /* The parser will print an error message for us, so we silently return.  */
 113   if (sim_parse_args (sd, argv) != SIM_RC_OK)
 114     {
 115       free_state (sd);
 116       return 0;
 117     }
 118
 119 #if 0
 120   /* Allocate a handler for I/O devices
 121      if no memory for that range has been allocated by the user.
 122      All are allocated in one chunk to keep things from being
 123      unnecessarily complicated.  */
 124   if (sim_core_read_buffer (sd, NULL, read_map, &c, LM32_DEVICE_ADDR, 1) == 0)
 125     sim_core_attach (sd, NULL, 0 /*level */ ,
 126                      access_read_write, 0 /*space ??? */ ,
 127                      LM32_DEVICE_ADDR, LM32_DEVICE_LEN /*nr_bytes */ ,
 128                      0 /*modulo */ ,
 129                      &lm32_devices, NULL /*buffer */ );
 130 #endif
 131
 132   /* check for/establish the reference program image.  */
 133   if (sim_analyze_program (sd,
 134                            (STATE_PROG_ARGV (sd) != NULL
 135                             ? *STATE_PROG_ARGV (sd)
 136                             : NULL), abfd) != SIM_RC_OK)
 137     {
 138       free_state (sd);
 139       return 0;
 140     }
 141
 142   /* Check to see if memory exists at programs start address.  */
 143   if (sim_core_read_buffer (sd, NULL, read_map, &c, STATE_START_ADDR (sd), 1)
 144       == 0)
 145     {
 146       if (STATE_PROG_BFD (sd) != NULL)
 147         {
 148           /* It doesn't, so we should try to allocate enough memory to hold program.  */
 149           base = find_base (STATE_PROG_BFD (sd));
 150           limit = find_limit (sd);
 151           if (limit == 0)
 152             {
 153               sim_io_eprintf (sd,
 154                               "Failed to find symbol _fstack in program. You must specify memory regions with --memory-region.\n");
 155               free_state (sd);
 156               return 0;
 157             }
 158           /*sim_io_printf (sd, "Allocating memory at 0x%x size 0x%x\n", base, limit); */
 159           sim_do_commandf (sd, "memory region 0x%x,0x%x", base, limit);
 160         }
 161     }
 162
 163   /* Establish any remaining configuration options.  */
 164   if (sim_config (sd) != SIM_RC_OK)
 165     {
 166       free_state (sd);
 167       return 0;
 168     }
 169
 170   if (sim_post_argv_init (sd) != SIM_RC_OK)
 171     {
 172       free_state (sd);
 173       return 0;
 174     }
 175
 176   /* Open a copy of the cpu descriptor table.  */
 177   {
 178     CGEN_CPU_DESC cd =
 179       lm32_cgen_cpu_open_1 (STATE_ARCHITECTURE (sd)->printable_name,
 180                             CGEN_ENDIAN_BIG);
 181     for (i = 0; i < MAX_NR_PROCESSORS; ++i)
 182       {
 183         SIM_CPU *cpu = STATE_CPU (sd, i);
 184         CPU_CPU_DESC (cpu) = cd;
 185         CPU_DISASSEMBLER (cpu) = sim_cgen_disassemble_insn;
 186       }
 187     lm32_cgen_init_dis (cd);
 188   }
 189
 190   /* Initialize various cgen things not done by common framework.
 191      Must be done after lm32_cgen_cpu_open.  */
 192   cgen_init (sd);
 193
 194   return sd;
 195 }
 196 \f
 197 SIM_RC
 198 sim_create_inferior (sd, abfd, argv, envp)
 199      SIM_DESC sd;
 200      struct bfd *abfd;
 201      char * const *argv;
 202      char * const *envp;
 203 {
 204   SIM_CPU *current_cpu = STATE_CPU (sd, 0);
 205   SIM_ADDR addr;
 206
 207   if (abfd != NULL)
 208     addr = bfd_get_start_address (abfd);
 209   else
 210     addr = 0;
 211   sim_pc_set (current_cpu, addr);
 212
 213   /* Standalone mode (i.e. `run`) will take care of the argv for us in
 214      sim_open() -> sim_parse_args().  But in debug mode (i.e. 'target sim'
 215      with `gdb`), we need to handle it because the user can change the
 216      argv on the fly via gdb's 'run'.  */
 217   if (STATE_PROG_ARGV (sd) != argv)
 218     {
 219       freeargv (STATE_PROG_ARGV (sd));
 220       STATE_PROG_ARGV (sd) = dupargv (argv);
 221     }
 222
 223   return SIM_RC_OK;
 224 }