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[/] [openrisc/] [trunk/] [gnu-src/] [gdb-7.2/] [sim/] [lm32/] [sim-if.c] - Blame information for rev 438

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1 330 jeremybenn
/* Main simulator entry points specific to Lattice Mico32.
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   Contributed by Jon Beniston <jon@beniston.com>
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4
   Copyright (C) 2009, 2010 Free Software Foundation, Inc.
5
 
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   This file is part of GDB.
7
 
8
   This program is free software; you can redistribute it and/or modify
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   it under the terms of the GNU General Public License as published by
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   the Free Software Foundation; either version 3 of the License, or
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   (at your option) any later version.
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   This program is distributed in the hope that it will be useful,
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   but WITHOUT ANY WARRANTY; without even the implied warranty of
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   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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   GNU General Public License for more details.
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   You should have received a copy of the GNU General Public License
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   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
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21
#include "sim-main.h"
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#include "sim-options.h"
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#include "libiberty.h"
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#include "bfd.h"
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#ifdef HAVE_STDLIB_H
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#include <stdlib.h>
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#endif
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static void free_state (SIM_DESC);
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static void print_lm32_misc_cpu (SIM_CPU * cpu, int verbose);
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static DECLARE_OPTION_HANDLER (lm32_option_handler);
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enum
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{
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  OPTION_ENDIAN = OPTION_START,
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};
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/* 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.  */
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static const OPTION lm32_options[] = {
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  {{"endian", required_argument, NULL, OPTION_ENDIAN},
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   'E', "big", "Set endianness",
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   lm32_option_handler},
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  {{NULL, no_argument, NULL, 0}, '\0', NULL, NULL, NULL}
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};
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/* Records simulator descriptor so utilities like lm32_dump_regs can be
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   called from gdb.  */
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SIM_DESC current_state;
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51
/* Cover function of sim_state_free to free the cpu buffers as well.  */
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static void
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free_state (SIM_DESC sd)
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{
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  if (STATE_MODULES (sd) != NULL)
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    sim_module_uninstall (sd);
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  sim_cpu_free_all (sd);
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  sim_state_free (sd);
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}
61
 
62
/* Find memory range used by program.  */
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static unsigned long
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find_base (bfd *prog_bfd)
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{
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  int found;
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  unsigned long base = ~(0UL);
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  asection *s;
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  found = 0;
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  for (s = prog_bfd->sections; s; s = s->next)
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    {
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      if ((strcmp (bfd_get_section_name (prog_bfd, s), ".boot") == 0)
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          || (strcmp (bfd_get_section_name (prog_bfd, s), ".text") == 0)
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          || (strcmp (bfd_get_section_name (prog_bfd, s), ".data") == 0)
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          || (strcmp (bfd_get_section_name (prog_bfd, s), ".bss") == 0))
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        {
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          if (!found)
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            {
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              base = bfd_get_section_vma (prog_bfd, s);
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              found = 1;
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            }
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          else
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            base =
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              bfd_get_section_vma (prog_bfd,
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                                   s) < base ? bfd_get_section_vma (prog_bfd,
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                                                                    s) : base;
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        }
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    }
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  return base & ~(0xffffUL);
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}
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94
static unsigned long
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find_limit (bfd *prog_bfd)
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{
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  struct bfd_symbol **asymbols;
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  long symsize;
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  long symbol_count;
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  long s;
101
 
102
  symsize = bfd_get_symtab_upper_bound (prog_bfd);
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  if (symsize < 0)
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    return 0;
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  asymbols = (asymbol **) xmalloc (symsize);
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  symbol_count = bfd_canonicalize_symtab (prog_bfd, asymbols);
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  if (symbol_count < 0)
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    return 0;
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  for (s = 0; s < symbol_count; s++)
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    {
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      if (!strcmp (asymbols[s]->name, "_fstack"))
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        return (asymbols[s]->value + 65536) & ~(0xffffUL);
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    }
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  return 0;
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}
117
 
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/* Handle lm32 specific options.  */
119
 
120
static SIM_RC
121
lm32_option_handler (sd, cpu, opt, arg, is_command)
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     SIM_DESC sd;
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     sim_cpu *cpu;
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     int opt;
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     char *arg;
126
     int is_command;
127
{
128
  return SIM_RC_OK;
129
}
130
 
131
/* Create an instance of the simulator.  */
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SIM_DESC
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sim_open (kind, callback, abfd, argv)
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     SIM_OPEN_KIND kind;
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     host_callback *callback;
137
     struct bfd *abfd;
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     char **argv;
139
{
140
  SIM_DESC sd = sim_state_alloc (kind, callback);
141
  char c;
142
  int i;
143
  unsigned long base, limit;
144
 
145
  /* The cpu data is kept in a separately allocated chunk of memory.  */
146
  if (sim_cpu_alloc_all (sd, 1, cgen_cpu_max_extra_bytes ()) != SIM_RC_OK)
147
    {
148
      free_state (sd);
149
      return 0;
150
    }
151
 
152
  if (sim_pre_argv_init (sd, argv[0]) != SIM_RC_OK)
153
    {
154
      free_state (sd);
155
      return 0;
156
    }
157
  sim_add_option_table (sd, NULL, lm32_options);
158
 
159
  /* getopt will print the error message so we just have to exit if this fails.
160
     FIXME: Hmmm...  in the case of gdb we need getopt to call
161
     print_filtered.  */
162
  if (sim_parse_args (sd, argv) != SIM_RC_OK)
163
    {
164
      free_state (sd);
165
      return 0;
166
    }
167
 
168
#if 0
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  /* Allocate a handler for I/O devices
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     if no memory for that range has been allocated by the user.
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     All are allocated in one chunk to keep things from being
172
     unnecessarily complicated.  */
173
  if (sim_core_read_buffer (sd, NULL, read_map, &c, LM32_DEVICE_ADDR, 1) == 0)
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    sim_core_attach (sd, NULL, 0 /*level */ ,
175
                     access_read_write, 0 /*space ??? */ ,
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                     LM32_DEVICE_ADDR, LM32_DEVICE_LEN /*nr_bytes */ ,
177
 
178
                     &lm32_devices, NULL /*buffer */ );
179
#endif
180
 
181
  /* check for/establish the reference program image.  */
182
  if (sim_analyze_program (sd,
183
                           (STATE_PROG_ARGV (sd) != NULL
184
                            ? *STATE_PROG_ARGV (sd)
185
                            : NULL), abfd) != SIM_RC_OK)
186
    {
187
      free_state (sd);
188
      return 0;
189
    }
190
 
191
  /* Check to see if memory exists at programs start address.  */
192
  if (sim_core_read_buffer (sd, NULL, read_map, &c, STATE_START_ADDR (sd), 1)
193
      == 0)
194
    {
195
      if (STATE_PROG_BFD (sd) != NULL)
196
        {
197
          /* It doesn't, so we should try to allocate enough memory to hold program.  */
198
          base = find_base (STATE_PROG_BFD (sd));
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          limit = find_limit (STATE_PROG_BFD (sd));
200
          if (limit == 0)
201
            {
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              sim_io_eprintf (sd,
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                              "Failed to find symbol _fstack in program. You must specify memory regions with --memory-region.\n");
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              free_state (sd);
205
              return 0;
206
            }
207
          /*sim_io_printf (sd, "Allocating memory at 0x%x size 0x%x\n", base, limit); */
208
          sim_do_commandf (sd, "memory region 0x%x,0x%x", base, limit);
209
        }
210
    }
211
 
212
  /* Establish any remaining configuration options.  */
213
  if (sim_config (sd) != SIM_RC_OK)
214
    {
215
      free_state (sd);
216
      return 0;
217
    }
218
 
219
  if (sim_post_argv_init (sd) != SIM_RC_OK)
220
    {
221
      free_state (sd);
222
      return 0;
223
    }
224
 
225
  /* Open a copy of the cpu descriptor table.  */
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  {
227
    CGEN_CPU_DESC cd =
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      lm32_cgen_cpu_open_1 (STATE_ARCHITECTURE (sd)->printable_name,
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                            CGEN_ENDIAN_BIG);
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    for (i = 0; i < MAX_NR_PROCESSORS; ++i)
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      {
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        SIM_CPU *cpu = STATE_CPU (sd, i);
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        CPU_CPU_DESC (cpu) = cd;
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        CPU_DISASSEMBLER (cpu) = sim_cgen_disassemble_insn;
235
      }
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    lm32_cgen_init_dis (cd);
237
  }
238
 
239
  /* Initialize various cgen things not done by common framework.
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     Must be done after lm32_cgen_cpu_open.  */
241
  cgen_init (sd);
242
 
243
  /* Store in a global so things like lm32_dump_regs can be invoked
244
     from the gdb command line.  */
245
  current_state = sd;
246
 
247
  return sd;
248
}
249
 
250
void
251
sim_close (sd, quitting)
252
     SIM_DESC sd;
253
     int quitting;
254
{
255
  lm32_cgen_cpu_close (CPU_CPU_DESC (STATE_CPU (sd, 0)));
256
  sim_module_uninstall (sd);
257
}
258
 
259
SIM_RC
260
sim_create_inferior (sd, abfd, argv, envp)
261
     SIM_DESC sd;
262
     struct bfd *abfd;
263
     char **argv;
264
     char **envp;
265
{
266
  SIM_CPU *current_cpu = STATE_CPU (sd, 0);
267
  SIM_ADDR addr;
268
 
269
  if (abfd != NULL)
270
    addr = bfd_get_start_address (abfd);
271
  else
272
    addr = 0;
273
  sim_pc_set (current_cpu, addr);
274
 
275
#if 0
276
  STATE_ARGV (sd) = sim_copy_argv (argv);
277
  STATE_ENVP (sd) = sim_copy_argv (envp);
278
#endif
279
 
280
  return SIM_RC_OK;
281
}
282
 
283
void
284
sim_do_command (sd, cmd)
285
     SIM_DESC sd;
286
     char *cmd;
287
{
288
  if (sim_args_command (sd, cmd) != SIM_RC_OK)
289
    sim_io_eprintf (sd, "Unknown command `%s'\n", cmd);
290
}

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