aboutsummaryrefslogtreecommitdiff
path: root/sim/lm32/sim-if.c
blob: 71312d36442bc341295279d4302af63886b14bcb (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
/* Main simulator entry points specific to Lattice Mico32.
   Contributed by Jon Beniston <jon@beniston.com>
   
   Copyright (C) 2009-2019 Free Software Foundation, Inc.

   This file is part of GDB.

   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 3 of the License, or
   (at your option) any later version.

   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */

#include "sim-main.h"
#include "sim-options.h"
#include "libiberty.h"
#include "bfd.h"

#ifdef HAVE_STDLIB_H
#include <stdlib.h>
#endif

/* Cover function of sim_state_free to free the cpu buffers as well.  */

static void
free_state (SIM_DESC sd)
{
  if (STATE_MODULES (sd) != NULL)
    sim_module_uninstall (sd);
  sim_cpu_free_all (sd);
  sim_state_free (sd);
}

/* Find memory range used by program.  */

static unsigned long
find_base (bfd *prog_bfd)
{
  int found;
  unsigned long base = ~(0UL);
  asection *s;

  found = 0;
  for (s = prog_bfd->sections; s; s = s->next)
    {
      if ((strcmp (bfd_section_name (s), ".boot") == 0)
	  || (strcmp (bfd_section_name (s), ".text") == 0)
	  || (strcmp (bfd_section_name (s), ".data") == 0)
	  || (strcmp (bfd_section_name (s), ".bss") == 0))
	{
	  if (!found)
	    {
	      base = bfd_section_vma (s);
	      found = 1;
	    }
	  else
	    base = bfd_section_vma (s) < base ? bfd_section_vma (s) : base;
	}
    }
  return base & ~(0xffffUL);
}

static unsigned long
find_limit (SIM_DESC sd)
{
  bfd_vma addr;

  addr = trace_sym_value (sd, "_fstack");
  if (addr == -1)
    return 0;

  return (addr + 65536) & ~(0xffffUL);
}

/* Create an instance of the simulator.  */

SIM_DESC
sim_open (kind, callback, abfd, argv)
     SIM_OPEN_KIND kind;
     host_callback *callback;
     struct bfd *abfd;
     char * const *argv;
{
  SIM_DESC sd = sim_state_alloc (kind, callback);
  char c;
  int i;
  unsigned long base, limit;

  /* The cpu data is kept in a separately allocated chunk of memory.  */
  if (sim_cpu_alloc_all (sd, 1, cgen_cpu_max_extra_bytes ()) != SIM_RC_OK)
    {
      free_state (sd);
      return 0;
    }

  if (sim_pre_argv_init (sd, argv[0]) != SIM_RC_OK)
    {
      free_state (sd);
      return 0;
    }

  /* The parser will print an error message for us, so we silently return.  */
  if (sim_parse_args (sd, argv) != SIM_RC_OK)
    {
      free_state (sd);
      return 0;
    }

#if 0
  /* Allocate a handler for I/O devices
     if no memory for that range has been allocated by the user.
     All are allocated in one chunk to keep things from being
     unnecessarily complicated.  */
  if (sim_core_read_buffer (sd, NULL, read_map, &c, LM32_DEVICE_ADDR, 1) == 0)
    sim_core_attach (sd, NULL, 0 /*level */ ,
		     access_read_write, 0 /*space ??? */ ,
		     LM32_DEVICE_ADDR, LM32_DEVICE_LEN /*nr_bytes */ ,
		     0 /*modulo */ ,
		     &lm32_devices, NULL /*buffer */ );
#endif

  /* check for/establish the reference program image.  */
  if (sim_analyze_program (sd,
			   (STATE_PROG_ARGV (sd) != NULL
			    ? *STATE_PROG_ARGV (sd)
			    : NULL), abfd) != SIM_RC_OK)
    {
      free_state (sd);
      return 0;
    }

  /* Check to see if memory exists at programs start address.  */
  if (sim_core_read_buffer (sd, NULL, read_map, &c, STATE_START_ADDR (sd), 1)
      == 0)
    {
      if (STATE_PROG_BFD (sd) != NULL)
	{
	  /* It doesn't, so we should try to allocate enough memory to hold program.  */
	  base = find_base (STATE_PROG_BFD (sd));
	  limit = find_limit (sd);
	  if (limit == 0)
	    {
	      sim_io_eprintf (sd,
			      "Failed to find symbol _fstack in program. You must specify memory regions with --memory-region.\n");
	      free_state (sd);
	      return 0;
	    }
	  /*sim_io_printf (sd, "Allocating memory at 0x%x size 0x%x\n", base, limit); */
	  sim_do_commandf (sd, "memory region 0x%x,0x%x", base, limit);
	}
    }

  /* Establish any remaining configuration options.  */
  if (sim_config (sd) != SIM_RC_OK)
    {
      free_state (sd);
      return 0;
    }

  if (sim_post_argv_init (sd) != SIM_RC_OK)
    {
      free_state (sd);
      return 0;
    }

  /* Open a copy of the cpu descriptor table.  */
  {
    CGEN_CPU_DESC cd =
      lm32_cgen_cpu_open_1 (STATE_ARCHITECTURE (sd)->printable_name,
			    CGEN_ENDIAN_BIG);
    for (i = 0; i < MAX_NR_PROCESSORS; ++i)
      {
	SIM_CPU *cpu = STATE_CPU (sd, i);
	CPU_CPU_DESC (cpu) = cd;
	CPU_DISASSEMBLER (cpu) = sim_cgen_disassemble_insn;
      }
    lm32_cgen_init_dis (cd);
  }

  /* Initialize various cgen things not done by common framework.
     Must be done after lm32_cgen_cpu_open.  */
  cgen_init (sd);

  return sd;
}

SIM_RC
sim_create_inferior (sd, abfd, argv, envp)
     SIM_DESC sd;
     struct bfd *abfd;
     char * const *argv;
     char * const *envp;
{
  SIM_CPU *current_cpu = STATE_CPU (sd, 0);
  SIM_ADDR addr;

  if (abfd != NULL)
    addr = bfd_get_start_address (abfd);
  else
    addr = 0;
  sim_pc_set (current_cpu, addr);

  /* Standalone mode (i.e. `run`) will take care of the argv for us in
     sim_open() -> sim_parse_args().  But in debug mode (i.e. 'target sim'
     with `gdb`), we need to handle it because the user can change the
     argv on the fly via gdb's 'run'.  */
  if (STATE_PROG_ARGV (sd) != argv)
    {
      freeargv (STATE_PROG_ARGV (sd));
      STATE_PROG_ARGV (sd) = dupargv (argv);
    }

  return SIM_RC_OK;
}