aboutsummaryrefslogtreecommitdiff
path: root/gdb/gdbarch.c
blob: b9ee31037862b3b9f9bafa1f95e82d7f666664d7 (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
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
/* Semi-dynamic architecture support for GDB, the GNU debugger.
   Copyright 1998, 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 2 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, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */

#include "defs.h"

/* Just include everything in sight so that the every old definition
   of macro is visible. */
#include "gdb_string.h"
#include <ctype.h>
#include "symtab.h"
#include "frame.h"
#include "inferior.h"
#include "breakpoint.h"
#include "wait.h"
#include "gdbcore.h"
#include "gdbcmd.h"
#include "target.h"
#include "gdbthread.h"
#include "annotate.h"
#include "symfile.h"		/* for overlay functions */
#include "symcat.h"


/* Non-zero if we want to trace architecture code.  */

#ifndef GDBARCH_DEBUG
#define GDBARCH_DEBUG 0
#endif
int gdbarch_debug = GDBARCH_DEBUG;


/* Functions to manipulate the endianness of the target.  */

#ifdef TARGET_BYTE_ORDER_SELECTABLE
/* compat - Catch old targets that expect a selectable byte-order to
   default to BIG_ENDIAN */
#ifndef TARGET_BYTE_ORDER_DEFAULT
#define TARGET_BYTE_ORDER_DEFAULT BIG_ENDIAN
#endif
#endif
#if !TARGET_BYTE_ORDER_SELECTABLE_P
#ifndef TARGET_BYTE_ORDER_DEFAULT
/* compat - Catch old non byte-order selectable targets that do not
   define TARGET_BYTE_ORDER_DEFAULT and instead expect
   TARGET_BYTE_ORDER to be used as the default.  For targets that
   defined neither TARGET_BYTE_ORDER nor TARGET_BYTE_ORDER_DEFAULT the
   below will get a strange compiler warning. */
#define TARGET_BYTE_ORDER_DEFAULT TARGET_BYTE_ORDER
#endif
#endif
#ifndef TARGET_BYTE_ORDER_DEFAULT
#define TARGET_BYTE_ORDER_DEFAULT BIG_ENDIAN /* arbitrary */
#endif
int target_byte_order = TARGET_BYTE_ORDER_DEFAULT;
int target_byte_order_auto = 1;

/* Chain containing the \"set endian\" commands.  */
static struct cmd_list_element *endianlist = NULL;

/* Called by ``show endian''.  */
static void show_endian PARAMS ((char *, int));
static void
show_endian (args, from_tty)
     char *args;
     int from_tty;
{
  char *msg =
    (TARGET_BYTE_ORDER_AUTO
     ? "The target endianness is set automatically (currently %s endian)\n"
     : "The target is assumed to be %s endian\n");
  printf_unfiltered (msg, (TARGET_BYTE_ORDER == BIG_ENDIAN ? "big" : "little"));
}

/* Called if the user enters ``set endian'' without an argument.  */
static void set_endian PARAMS ((char *, int));
static void
set_endian (args, from_tty)
     char *args;
     int from_tty;
{
  printf_unfiltered ("\"set endian\" must be followed by \"auto\", \"big\" or \"little\".\n");
  show_endian (args, from_tty);
}

/* Called by ``set endian big''.  */
static void set_endian_big PARAMS ((char *, int));
static void
set_endian_big (args, from_tty)
     char *args;
     int from_tty;
{
  if (TARGET_BYTE_ORDER_SELECTABLE_P)
    {
      target_byte_order = BIG_ENDIAN;
      target_byte_order_auto = 0;
    }
  else
    {
      printf_unfiltered ("Byte order is not selectable.");
      show_endian (args, from_tty);
    }
}

/* Called by ``set endian little''.  */
static void set_endian_little PARAMS ((char *, int));
static void
set_endian_little (args, from_tty)
     char *args;
     int from_tty;
{
  if (TARGET_BYTE_ORDER_SELECTABLE_P)
    {
      target_byte_order = LITTLE_ENDIAN;
      target_byte_order_auto = 0;
    }
  else
    {
      printf_unfiltered ("Byte order is not selectable.");
      show_endian (args, from_tty);
    }
}

/* Called by ``set endian auto''.  */
static void set_endian_auto PARAMS ((char *, int));
static void
set_endian_auto (args, from_tty)
     char *args;
     int from_tty;
{
  if (TARGET_BYTE_ORDER_SELECTABLE_P)
    {
      target_byte_order_auto = 1;
    }
  else
    {
      printf_unfiltered ("Byte order is not selectable.");
      show_endian (args, from_tty);
    }
}

/* Set the endianness from a BFD.  */
static void set_endian_from_file PARAMS ((bfd *));
static void
set_endian_from_file (abfd)
     bfd *abfd;
{
  if (TARGET_BYTE_ORDER_SELECTABLE_P)
    {
      int want;
      
      if (bfd_big_endian (abfd))
	want = BIG_ENDIAN;
      else
	want = LITTLE_ENDIAN;
      if (TARGET_BYTE_ORDER_AUTO)
	target_byte_order = want;
      else if (TARGET_BYTE_ORDER != want)
	warning ("%s endian file does not match %s endian target.",
		 want == BIG_ENDIAN ? "big" : "little",
		 TARGET_BYTE_ORDER == BIG_ENDIAN ? "big" : "little");
    }
  else
    {
      if (bfd_big_endian (abfd)
	  ? TARGET_BYTE_ORDER != BIG_ENDIAN
	  : TARGET_BYTE_ORDER == BIG_ENDIAN)
	warning ("%s endian file does not match %s endian target.",
		 bfd_big_endian (abfd) ? "big" : "little",
		 TARGET_BYTE_ORDER == BIG_ENDIAN ? "big" : "little");
    }
}



/* Functions to manipulate the architecture of the target */

int target_architecture_auto = 1;
extern const struct bfd_arch_info bfd_default_arch_struct;
const struct bfd_arch_info *target_architecture = &bfd_default_arch_struct;
int (*target_architecture_hook) PARAMS ((const struct bfd_arch_info *ap));

/* Do the real work of changing the current architecture */
enum set_arch { set_arch_auto, set_arch_manual };
static void
set_arch (arch, type)
     const struct bfd_arch_info *arch;
     enum set_arch type;
{
  /* FIXME: Should be performing the more basic check that the binary
     is compatible with GDB. */
  /* Check with the target that the architecture is valid. */
  int arch_valid = (target_architecture_hook != NULL
		    && !target_architecture_hook (arch));
  switch (type)
    {
    case set_arch_auto:
      if (!arch_valid)
	warning ("Target may not support %s architecture",
		 arch->printable_name);
      target_architecture = arch;
      break;
    case set_arch_manual:
      if (!arch_valid)
	{
	  printf_unfiltered ("Target does not support `%s' architecture.\n",
			     arch->printable_name);
	}
      else
	{
	  target_architecture_auto = 0;
	  target_architecture = arch;
	}
      break;
    }
}

/* Called if the user enters ``show architecture'' without an argument. */
static void show_architecture PARAMS ((char *, int));
static void
show_architecture (args, from_tty)
     char *args;
     int from_tty;
{
  const char *arch;
  arch = TARGET_ARCHITECTURE->printable_name;
  if (target_architecture_auto)
    printf_filtered ("The target architecture is set automatically (currently %s)\n", arch);
  else
    printf_filtered ("The target architecture is assumed to be %s\n", arch);
}

/* Called if the user enters ``set architecture'' with or without an
   argument. */
static void set_architecture PARAMS ((char *, int));
static void
set_architecture (args, from_tty)
     char *args;
     int from_tty;
{
  if (args == NULL)
    {
      printf_unfiltered ("\"set architecture\" must be followed by \"auto\" or an architecture name.\n");
    }
  else if (strcmp (args, "auto") == 0)
    {
      target_architecture_auto = 1;
    }
  else
    {
      const struct bfd_arch_info *arch = bfd_scan_arch (args);
      if (arch != NULL)
	set_arch (arch, set_arch_manual);
      else
	printf_unfiltered ("Architecture `%s' not reconized.\n", args);
    }
}

/* Called if the user enters ``info architecture'' without an argument. */
static void info_architecture PARAMS ((char *, int));
static void
info_architecture (args, from_tty)
     char *args;
     int from_tty;
{
  enum bfd_architecture a;
  printf_filtered ("Available architectures are:\n");
  for (a = bfd_arch_obscure + 1; a < bfd_arch_last; a++)
    {
      const struct bfd_arch_info *ap = bfd_lookup_arch (a, 0);
      if (ap != NULL)
	{
	  do
	    {
	      printf_filtered (" %s", ap->printable_name);
	      ap = ap->next;
	    }
	  while (ap != NULL);
	  printf_filtered ("\n");
	}
    }
}

/* Set the architecture from arch/machine */
void
set_architecture_from_arch_mach (arch, mach)
     enum bfd_architecture arch;
     unsigned long mach;
{
  const struct bfd_arch_info *wanted = bfd_lookup_arch (arch, mach);
  if (wanted != NULL)
    set_arch (wanted, set_arch_manual);
  else
    fatal ("hardwired architecture/machine not reconized");
}

/* Set the architecture from a BFD */
static void set_architecture_from_file PARAMS ((bfd *));
static void
set_architecture_from_file (abfd)
     bfd *abfd;
{
  const struct bfd_arch_info *wanted = bfd_get_arch_info (abfd);
  if (target_architecture_auto)
    {
      set_arch (wanted, set_arch_auto);
    }
  else if (wanted != target_architecture)
    {
      warning ("%s architecture file may be incompatible with %s target.",
	       wanted->printable_name,
	       target_architecture->printable_name);
    }
}



/* Disassembler */

/* Pointer to the target-dependent disassembly function.  */
int (*tm_print_insn) PARAMS ((bfd_vma, disassemble_info *));
disassemble_info tm_print_insn_info;



/* Set the dynamic target-system-dependant parameters (architecture,
   byte-order) using information found in the BFD */

void
set_gdbarch_from_file (abfd)
     bfd *abfd;
{
  set_architecture_from_file (abfd);
  set_endian_from_file (abfd);
}


#if defined (CALL_DUMMY)
/* FIXME - this should go away */
LONGEST call_dummy_words[] = CALL_DUMMY;
int sizeof_call_dummy_words = sizeof (call_dummy_words);
#endif


extern void _initialize_gdbarch PARAMS ((void));
void
_initialize_gdbarch ()
{
  add_prefix_cmd ("endian", class_support, set_endian,
		  "Set endianness of target.",
		  &endianlist, "set endian ", 0, &setlist);
  add_cmd ("big", class_support, set_endian_big,
	   "Set target as being big endian.", &endianlist);
  add_cmd ("little", class_support, set_endian_little,
	   "Set target as being little endian.", &endianlist);
  add_cmd ("auto", class_support, set_endian_auto,
	   "Select target endianness automatically.", &endianlist);
  add_cmd ("endian", class_support, show_endian,
	   "Show endianness of target.", &showlist);

  add_cmd ("architecture", class_support, set_architecture,
	   "Set architecture of target.", &setlist);
  add_alias_cmd ("processor", "architecture", class_support, 1, &setlist);
  add_cmd ("architecture", class_support, show_architecture,
	   "Show architecture of target.", &showlist);
  add_cmd ("architecture", class_support, info_architecture,
	   "List supported target architectures", &infolist);

  INIT_DISASSEMBLE_INFO_NO_ARCH (tm_print_insn_info, gdb_stdout, (fprintf_ftype)fprintf_filtered);
  tm_print_insn_info.flavour = bfd_target_unknown_flavour;
  tm_print_insn_info.read_memory_func = dis_asm_read_memory;
  tm_print_insn_info.memory_error_func = dis_asm_memory_error;
  tm_print_insn_info.print_address_func = dis_asm_print_address;

  add_show_from_set (add_set_cmd ("archdebug",
				  class_maintenance,
				  var_zinteger,
				  (char *)&gdbarch_debug,
				  "Set architecture debugging.\n\
When non-zero, architecture debugging is enabled.", &setlist),
		     &showlist);
}