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) 2009-2016 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
  30 static void free_state (SIM_DESC);
  31 static void print_lm32_misc_cpu (SIM_CPU * cpu, int verbose);
  32 static DECLARE_OPTION_HANDLER (lm32_option_handler);
  33
  34 enum
  35 {
  36   OPTION_ENDIAN = OPTION_START,
  37 };
  38
  39 /* GDB passes -E, even though it's fixed, so we have to handle it here. common code only handles it if SIM_HAVE_BIENDIAN is defined, which it isn't for lm32.  */
  40 static const OPTION lm32_options[] = {
  41   {{"endian", required_argument, NULL, OPTION_ENDIAN},
  42    'E', "big", "Set endianness",
  43    lm32_option_handler},
  44   {{NULL, no_argument, NULL, 0}, '\0', NULL, NULL, NULL}
  45 };
  46 \f
  47 /* Cover function of sim_state_free to free the cpu buffers as well.  */
  48
  49 static void
  50 free_state (SIM_DESC sd)
  51 {
  52   if (STATE_MODULES (sd) != NULL)
  53     sim_module_uninstall (sd);
  54   sim_cpu_free_all (sd);
  55   sim_state_free (sd);
  56 }
  57
  58 /* Find memory range used by program.  */
  59
  60 static unsigned long
  61 find_base (bfd *prog_bfd)
  62 {
  63   int found;
  64   unsigned long base = ~(0UL);
  65   asection *s;
  66
  67   found = 0;
  68   for (s = prog_bfd->sections; s; s = s->next)
  69     {
  70       if ((strcmp (bfd_get_section_name (prog_bfd, s), ".boot") == 0)
  71           || (strcmp (bfd_get_section_name (prog_bfd, s), ".text") == 0)
  72           || (strcmp (bfd_get_section_name (prog_bfd, s), ".data") == 0)
  73           || (strcmp (bfd_get_section_name (prog_bfd, s), ".bss") == 0))
  74         {
  75           if (!found)
  76             {
  77               base = bfd_get_section_vma (prog_bfd, s);
  78               found = 1;
  79             }
  80           else
  81             base =
  82               bfd_get_section_vma (prog_bfd,
  83                                    s) < base ? bfd_get_section_vma (prog_bfd,
  84                                                                     s) : base;
  85         }
  86     }
  87   return base & ~(0xffffUL);
  88 }
  89
  90 static unsigned long
  91 find_limit (bfd *prog_bfd)
  92 {
  93   struct bfd_symbol **asymbols;
  94   long symsize;
  95   long symbol_count;
  96   long s;
  97
  98   symsize = bfd_get_symtab_upper_bound (prog_bfd);
  99   if (symsize < 0)
 100     return 0;
 101   asymbols = (asymbol **) xmalloc (symsize);
 102   symbol_count = bfd_canonicalize_symtab (prog_bfd, asymbols);
 103   if (symbol_count < 0)
 104     return 0;
 105
 106   for (s = 0; s < symbol_count; s++)
 107     {
 108       if (!strcmp (asymbols[s]->name, "_fstack"))
 109         return (asymbols[s]->value + 65536) & ~(0xffffUL);
 110     }
 111   return 0;
 112 }
 113
 114 /* Handle lm32 specific options.  */
 115
 116 static SIM_RC
 117 lm32_option_handler (sd, cpu, opt, arg, is_command)
 118      SIM_DESC sd;
 119      sim_cpu *cpu;
 120      int opt;
 121      char *arg;
 122      int is_command;
 123 {
 124   return SIM_RC_OK;
 125 }
 126
 127 /* Create an instance of the simulator.  */
 128
 129 SIM_DESC
 130 sim_open (kind, callback, abfd, argv)
 131      SIM_OPEN_KIND kind;
 132      host_callback *callback;
 133      struct bfd *abfd;
 134      char **argv;
 135 {
 136   SIM_DESC sd = sim_state_alloc (kind, callback);
 137   char c;
 138   int i;
 139   unsigned long base, limit;
 140
 141   /* The cpu data is kept in a separately allocated chunk of memory.  */
 142   if (sim_cpu_alloc_all (sd, 1, cgen_cpu_max_extra_bytes ()) != SIM_RC_OK)
 143     {
 144       free_state (sd);
 145       return 0;
 146     }
 147
 148   if (sim_pre_argv_init (sd, argv[0]) != SIM_RC_OK)
 149     {
 150       free_state (sd);
 151       return 0;
 152     }
 153   sim_add_option_table (sd, NULL, lm32_options);
 154
 155   /* getopt will print the error message so we just have to exit if this fails.
 156      FIXME: Hmmm...  in the case of gdb we need getopt to call
 157      print_filtered.  */
 158   if (sim_parse_args (sd, argv) != SIM_RC_OK)
 159     {
 160       free_state (sd);
 161       return 0;
 162     }
 163
 164 #if 0
 165   /* Allocate a handler for I/O devices
 166      if no memory for that range has been allocated by the user.
 167      All are allocated in one chunk to keep things from being
 168      unnecessarily complicated.  */
 169   if (sim_core_read_buffer (sd, NULL, read_map, &c, LM32_DEVICE_ADDR, 1) == 0)
 170     sim_core_attach (sd, NULL, 0 /*level */ ,
 171                      access_read_write, 0 /*space ??? */ ,
 172                      LM32_DEVICE_ADDR, LM32_DEVICE_LEN /*nr_bytes */ ,
 173                      0 /*modulo */ ,
 174                      &lm32_devices, NULL /*buffer */ );
 175 #endif
 176
 177   /* check for/establish the reference program image.  */
 178   if (sim_analyze_program (sd,
 179                            (STATE_PROG_ARGV (sd) != NULL
 180                             ? *STATE_PROG_ARGV (sd)
 181                             : NULL), abfd) != SIM_RC_OK)
 182     {
 183       free_state (sd);
 184       return 0;
 185     }
 186
 187   /* Check to see if memory exists at programs start address.  */
 188   if (sim_core_read_buffer (sd, NULL, read_map, &c, STATE_START_ADDR (sd), 1)
 189       == 0)
 190     {
 191       if (STATE_PROG_BFD (sd) != NULL)
 192         {
 193           /* It doesn't, so we should try to allocate enough memory to hold program.  */
 194           base = find_base (STATE_PROG_BFD (sd));
 195           limit = find_limit (STATE_PROG_BFD (sd));
 196           if (limit == 0)
 197             {
 198               sim_io_eprintf (sd,
 199                               "Failed to find symbol _fstack in program. You must specify memory regions with --memory-region.\n");
 200               free_state (sd);
 201               return 0;
 202             }
 203           /*sim_io_printf (sd, "Allocating memory at 0x%x size 0x%x\n", base, limit); */
 204           sim_do_commandf (sd, "memory region 0x%x,0x%x", base, limit);
 205         }
 206     }
 207
 208   /* Establish any remaining configuration options.  */
 209   if (sim_config (sd) != SIM_RC_OK)
 210     {
 211       free_state (sd);
 212       return 0;
 213     }
 214
 215   if (sim_post_argv_init (sd) != SIM_RC_OK)
 216     {
 217       free_state (sd);
 218       return 0;
 219     }
 220
 221   /* Open a copy of the cpu descriptor table.  */
 222   {
 223     CGEN_CPU_DESC cd =
 224       lm32_cgen_cpu_open_1 (STATE_ARCHITECTURE (sd)->printable_name,
 225                             CGEN_ENDIAN_BIG);
 226     for (i = 0; i < MAX_NR_PROCESSORS; ++i)
 227       {
 228         SIM_CPU *cpu = STATE_CPU (sd, i);
 229         CPU_CPU_DESC (cpu) = cd;
 230         CPU_DISASSEMBLER (cpu) = sim_cgen_disassemble_insn;
 231       }
 232     lm32_cgen_init_dis (cd);
 233   }
 234
 235   /* Initialize various cgen things not done by common framework.
 236      Must be done after lm32_cgen_cpu_open.  */
 237   cgen_init (sd);
 238
 239   return sd;
 240 }
 241 \f
 242 SIM_RC
 243 sim_create_inferior (sd, abfd, argv, envp)
 244      SIM_DESC sd;
 245      struct bfd *abfd;
 246      char **argv;
 247      char **envp;
 248 {
 249   SIM_CPU *current_cpu = STATE_CPU (sd, 0);
 250   SIM_ADDR addr;
 251
 252   if (abfd != NULL)
 253     addr = bfd_get_start_address (abfd);
 254   else
 255     addr = 0;
 256   sim_pc_set (current_cpu, addr);
 257
 258   /* Standalone mode (i.e. `run`) will take care of the argv for us in
 259      sim_open() -> sim_parse_args().  But in debug mode (i.e. 'target sim'
 260      with `gdb`), we need to handle it because the user can change the
 261      argv on the fly via gdb's 'run'.  */
 262   if (STATE_PROG_ARGV (sd) != argv)
 263     {
 264       freeargv (STATE_PROG_ARGV (sd));
 265       STATE_PROG_ARGV (sd) = dupargv (argv);
 266     }
 267
 268   return SIM_RC_OK;
 269 }