Commit | Line | Data |
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c0e8c252 | 1 | /* Dynamic architecture support for GDB, the GNU debugger. |
f4f9705a | 2 | |
6aba47ca | 3 | Copyright (C) 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007 |
22a44745 | 4 | Free Software Foundation, Inc. |
c0e8c252 AC |
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 2 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, write to the Free Software | |
197e01b6 EZ |
20 | Foundation, Inc., 51 Franklin Street, Fifth Floor, |
21 | Boston, MA 02110-1301, USA. */ | |
c0e8c252 AC |
22 | |
23 | #include "defs.h" | |
24 | ||
fb6ecb0f | 25 | #include "arch-utils.h" |
192cb3d4 | 26 | #include "buildsym.h" |
c0e8c252 AC |
27 | #include "gdbcmd.h" |
28 | #include "inferior.h" /* enum CALL_DUMMY_LOCATION et.al. */ | |
5f8a3188 | 29 | #include "gdb_string.h" |
fbec36e2 | 30 | #include "regcache.h" |
39d4ef09 | 31 | #include "gdb_assert.h" |
4182591f | 32 | #include "sim-regno.h" |
750eb019 | 33 | #include "gdbcore.h" |
bf922ad9 | 34 | #include "osabi.h" |
424163ea | 35 | #include "target-descriptions.h" |
bf922ad9 | 36 | |
1ba607ad AC |
37 | #include "version.h" |
38 | ||
f0d4cc9e AC |
39 | #include "floatformat.h" |
40 | ||
1fd35568 JB |
41 | int |
42 | always_use_struct_convention (int gcc_p, struct type *value_type) | |
43 | { | |
44 | return 1; | |
45 | } | |
46 | ||
750eb019 AC |
47 | enum return_value_convention |
48 | legacy_return_value (struct gdbarch *gdbarch, struct type *valtype, | |
b60c417a AC |
49 | struct regcache *regcache, gdb_byte *readbuf, |
50 | const gdb_byte *writebuf) | |
750eb019 AC |
51 | { |
52 | /* NOTE: cagney/2004-06-13: The gcc_p parameter to | |
53 | USE_STRUCT_CONVENTION isn't used. */ | |
54 | int struct_return = ((TYPE_CODE (valtype) == TYPE_CODE_STRUCT | |
55 | || TYPE_CODE (valtype) == TYPE_CODE_UNION | |
56 | || TYPE_CODE (valtype) == TYPE_CODE_ARRAY) | |
57 | && DEPRECATED_USE_STRUCT_CONVENTION (0, valtype)); | |
58 | ||
59 | if (writebuf != NULL) | |
60 | { | |
61 | gdb_assert (!struct_return); | |
62 | /* NOTE: cagney/2004-06-13: See stack.c:return_command. Old | |
63 | architectures don't expect STORE_RETURN_VALUE to handle small | |
64 | structures. Should not be called with such types. */ | |
65 | gdb_assert (TYPE_CODE (valtype) != TYPE_CODE_STRUCT | |
66 | && TYPE_CODE (valtype) != TYPE_CODE_UNION); | |
67 | STORE_RETURN_VALUE (valtype, regcache, writebuf); | |
68 | } | |
69 | ||
70 | if (readbuf != NULL) | |
71 | { | |
72 | gdb_assert (!struct_return); | |
73 | EXTRACT_RETURN_VALUE (valtype, regcache, readbuf); | |
74 | } | |
75 | ||
76 | if (struct_return) | |
77 | return RETURN_VALUE_STRUCT_CONVENTION; | |
78 | else | |
79 | return RETURN_VALUE_REGISTER_CONVENTION; | |
80 | } | |
1fd35568 | 81 | |
4182591f AC |
82 | int |
83 | legacy_register_sim_regno (int regnum) | |
84 | { | |
85 | /* Only makes sense to supply raw registers. */ | |
f57d151a | 86 | gdb_assert (regnum >= 0 && regnum < gdbarch_num_regs (current_gdbarch)); |
4182591f AC |
87 | /* NOTE: cagney/2002-05-13: The old code did it this way and it is |
88 | suspected that some GDB/SIM combinations may rely on this | |
89 | behavour. The default should be one2one_register_sim_regno | |
90 | (below). */ | |
c9f4d572 UW |
91 | if (gdbarch_register_name (current_gdbarch, regnum) != NULL |
92 | && gdbarch_register_name (current_gdbarch, regnum)[0] != '\0') | |
4182591f AC |
93 | return regnum; |
94 | else | |
95 | return LEGACY_SIM_REGNO_IGNORE; | |
96 | } | |
97 | ||
bdcd319a CV |
98 | CORE_ADDR |
99 | generic_skip_trampoline_code (CORE_ADDR pc) | |
100 | { | |
101 | return 0; | |
102 | } | |
103 | ||
dea0c52f | 104 | CORE_ADDR |
4c8c40e6 | 105 | generic_skip_solib_resolver (struct gdbarch *gdbarch, CORE_ADDR pc) |
dea0c52f MK |
106 | { |
107 | return 0; | |
108 | } | |
109 | ||
d50355b6 MS |
110 | int |
111 | generic_in_solib_return_trampoline (CORE_ADDR pc, char *name) | |
112 | { | |
113 | return 0; | |
114 | } | |
115 | ||
c12260ac CV |
116 | int |
117 | generic_in_function_epilogue_p (struct gdbarch *gdbarch, CORE_ADDR pc) | |
118 | { | |
119 | return 0; | |
120 | } | |
121 | ||
4d1e7dd1 | 122 | /* Helper functions for gdbarch_inner_than */ |
3339cf8b AC |
123 | |
124 | int | |
fba45db2 | 125 | core_addr_lessthan (CORE_ADDR lhs, CORE_ADDR rhs) |
3339cf8b AC |
126 | { |
127 | return (lhs < rhs); | |
128 | } | |
129 | ||
130 | int | |
fba45db2 | 131 | core_addr_greaterthan (CORE_ADDR lhs, CORE_ADDR rhs) |
3339cf8b AC |
132 | { |
133 | return (lhs > rhs); | |
134 | } | |
135 | ||
193e3b1a AC |
136 | /* Misc helper functions for targets. */ |
137 | ||
f517ea4e | 138 | CORE_ADDR |
875e1767 | 139 | core_addr_identity (CORE_ADDR addr) |
f517ea4e PS |
140 | { |
141 | return addr; | |
142 | } | |
143 | ||
e2d0e7eb AC |
144 | CORE_ADDR |
145 | convert_from_func_ptr_addr_identity (struct gdbarch *gdbarch, CORE_ADDR addr, | |
146 | struct target_ops *targ) | |
147 | { | |
148 | return addr; | |
149 | } | |
150 | ||
88c72b7d AC |
151 | int |
152 | no_op_reg_to_regnum (int reg) | |
153 | { | |
154 | return reg; | |
155 | } | |
156 | ||
a2cf933a EZ |
157 | void |
158 | default_elf_make_msymbol_special (asymbol *sym, struct minimal_symbol *msym) | |
159 | { | |
160 | return; | |
161 | } | |
162 | ||
163 | void | |
164 | default_coff_make_msymbol_special (int val, struct minimal_symbol *msym) | |
165 | { | |
166 | return; | |
167 | } | |
168 | ||
01fb7433 AC |
169 | int |
170 | cannot_register_not (int regnum) | |
171 | { | |
172 | return 0; | |
173 | } | |
39d4ef09 AC |
174 | |
175 | /* Legacy version of target_virtual_frame_pointer(). Assumes that | |
0ba6dca9 AC |
176 | there is an DEPRECATED_FP_REGNUM and that it is the same, cooked or |
177 | raw. */ | |
39d4ef09 AC |
178 | |
179 | void | |
180 | legacy_virtual_frame_pointer (CORE_ADDR pc, | |
181 | int *frame_regnum, | |
182 | LONGEST *frame_offset) | |
183 | { | |
20bcf01c AC |
184 | /* FIXME: cagney/2002-09-13: This code is used when identifying the |
185 | frame pointer of the current PC. It is assuming that a single | |
186 | register and an offset can determine this. I think it should | |
187 | instead generate a byte code expression as that would work better | |
188 | with things like Dwarf2's CFI. */ | |
f57d151a UW |
189 | if (DEPRECATED_FP_REGNUM >= 0 |
190 | && DEPRECATED_FP_REGNUM < gdbarch_num_regs (current_gdbarch)) | |
0ba6dca9 | 191 | *frame_regnum = DEPRECATED_FP_REGNUM; |
f57d151a | 192 | else if (SP_REGNUM >= 0 && SP_REGNUM < gdbarch_num_regs (current_gdbarch)) |
20bcf01c AC |
193 | *frame_regnum = SP_REGNUM; |
194 | else | |
195 | /* Should this be an internal error? I guess so, it is reflecting | |
196 | an architectural limitation in the current design. */ | |
edefbb7c | 197 | internal_error (__FILE__, __LINE__, _("No virtual frame pointer available")); |
39d4ef09 AC |
198 | *frame_offset = 0; |
199 | } | |
46cd78fb | 200 | |
d7bd68ca | 201 | \f |
13d01224 | 202 | int |
a1f4a1b6 | 203 | generic_convert_register_p (int regnum, struct type *type) |
13d01224 | 204 | { |
9730f241 | 205 | return 0; |
13d01224 AC |
206 | } |
207 | ||
192cb3d4 MK |
208 | int |
209 | default_stabs_argument_has_addr (struct gdbarch *gdbarch, struct type *type) | |
210 | { | |
192cb3d4 MK |
211 | return 0; |
212 | } | |
213 | ||
3ca64954 RC |
214 | int |
215 | generic_instruction_nullified (struct gdbarch *gdbarch, | |
216 | struct regcache *regcache) | |
217 | { | |
218 | return 0; | |
219 | } | |
220 | ||
123dc839 DJ |
221 | int |
222 | default_remote_register_number (struct gdbarch *gdbarch, | |
223 | int regno) | |
224 | { | |
225 | return regno; | |
226 | } | |
227 | ||
01fb7433 | 228 | \f |
b4a20239 AC |
229 | /* Functions to manipulate the endianness of the target. */ |
230 | ||
7a107747 | 231 | static int target_byte_order_user = BFD_ENDIAN_UNKNOWN; |
b4a20239 | 232 | |
53904c9e AC |
233 | static const char endian_big[] = "big"; |
234 | static const char endian_little[] = "little"; | |
235 | static const char endian_auto[] = "auto"; | |
236 | static const char *endian_enum[] = | |
b4a20239 AC |
237 | { |
238 | endian_big, | |
239 | endian_little, | |
240 | endian_auto, | |
241 | NULL, | |
242 | }; | |
53904c9e | 243 | static const char *set_endian_string; |
b4a20239 | 244 | |
b6d373df DJ |
245 | enum bfd_endian |
246 | selected_byte_order (void) | |
247 | { | |
248 | if (target_byte_order_user != BFD_ENDIAN_UNKNOWN) | |
0d20ae72 | 249 | return gdbarch_byte_order (current_gdbarch); |
b6d373df DJ |
250 | else |
251 | return BFD_ENDIAN_UNKNOWN; | |
252 | } | |
253 | ||
b4a20239 AC |
254 | /* Called by ``show endian''. */ |
255 | ||
256 | static void | |
7ab04401 AC |
257 | show_endian (struct ui_file *file, int from_tty, struct cmd_list_element *c, |
258 | const char *value) | |
b4a20239 | 259 | { |
7b6b9e83 | 260 | if (target_byte_order_user == BFD_ENDIAN_UNKNOWN) |
0d20ae72 | 261 | if (gdbarch_byte_order (current_gdbarch) == BFD_ENDIAN_BIG) |
7ab04401 AC |
262 | fprintf_unfiltered (file, _("The target endianness is set automatically " |
263 | "(currently big endian)\n")); | |
edefbb7c | 264 | else |
7ab04401 | 265 | fprintf_unfiltered (file, _("The target endianness is set automatically " |
edefbb7c | 266 | "(currently little endian)\n")); |
b4a20239 | 267 | else |
0d20ae72 | 268 | if (gdbarch_byte_order (current_gdbarch) == BFD_ENDIAN_BIG) |
7ab04401 AC |
269 | fprintf_unfiltered (file, |
270 | _("The target is assumed to be big endian\n")); | |
271 | else | |
272 | fprintf_unfiltered (file, | |
273 | _("The target is assumed to be little endian\n")); | |
b4a20239 AC |
274 | } |
275 | ||
276 | static void | |
277 | set_endian (char *ignore_args, int from_tty, struct cmd_list_element *c) | |
278 | { | |
7a107747 DJ |
279 | struct gdbarch_info info; |
280 | ||
281 | gdbarch_info_init (&info); | |
282 | ||
3fd3d7d2 | 283 | if (set_endian_string == endian_auto) |
b4a20239 | 284 | { |
7a107747 DJ |
285 | target_byte_order_user = BFD_ENDIAN_UNKNOWN; |
286 | if (! gdbarch_update_p (info)) | |
287 | internal_error (__FILE__, __LINE__, | |
288 | _("set_endian: architecture update failed")); | |
b4a20239 AC |
289 | } |
290 | else if (set_endian_string == endian_little) | |
291 | { | |
d90cf509 AC |
292 | info.byte_order = BFD_ENDIAN_LITTLE; |
293 | if (! gdbarch_update_p (info)) | |
edefbb7c | 294 | printf_unfiltered (_("Little endian target not supported by GDB\n")); |
7a107747 DJ |
295 | else |
296 | target_byte_order_user = BFD_ENDIAN_LITTLE; | |
b4a20239 AC |
297 | } |
298 | else if (set_endian_string == endian_big) | |
299 | { | |
d90cf509 AC |
300 | info.byte_order = BFD_ENDIAN_BIG; |
301 | if (! gdbarch_update_p (info)) | |
edefbb7c | 302 | printf_unfiltered (_("Big endian target not supported by GDB\n")); |
7a107747 DJ |
303 | else |
304 | target_byte_order_user = BFD_ENDIAN_BIG; | |
b4a20239 AC |
305 | } |
306 | else | |
8e65ff28 | 307 | internal_error (__FILE__, __LINE__, |
edefbb7c | 308 | _("set_endian: bad value")); |
7a107747 | 309 | |
7ab04401 | 310 | show_endian (gdb_stdout, from_tty, NULL, NULL); |
b4a20239 AC |
311 | } |
312 | ||
23181151 DJ |
313 | /* Given SELECTED, a currently selected BFD architecture, and |
314 | FROM_TARGET, a BFD architecture reported by the target description, | |
315 | return what architecture to use. Either may be NULL; if both are | |
316 | specified, we use the more specific. If the two are obviously | |
317 | incompatible, warn the user. */ | |
318 | ||
319 | static const struct bfd_arch_info * | |
320 | choose_architecture_for_target (const struct bfd_arch_info *selected, | |
321 | const struct bfd_arch_info *from_target) | |
322 | { | |
323 | const struct bfd_arch_info *compat1, *compat2; | |
324 | ||
325 | if (selected == NULL) | |
326 | return from_target; | |
327 | ||
328 | if (from_target == NULL) | |
329 | return selected; | |
330 | ||
331 | /* struct bfd_arch_info objects are singletons: that is, there's | |
332 | supposed to be exactly one instance for a given machine. So you | |
333 | can tell whether two are equivalent by comparing pointers. */ | |
334 | if (from_target == selected) | |
335 | return selected; | |
336 | ||
337 | /* BFD's 'A->compatible (A, B)' functions return zero if A and B are | |
338 | incompatible. But if they are compatible, it returns the 'more | |
339 | featureful' of the two arches. That is, if A can run code | |
340 | written for B, but B can't run code written for A, then it'll | |
341 | return A. | |
342 | ||
343 | Some targets (e.g. MIPS as of 2006-12-04) don't fully | |
344 | implement this, instead always returning NULL or the first | |
345 | argument. We detect that case by checking both directions. */ | |
346 | ||
347 | compat1 = selected->compatible (selected, from_target); | |
348 | compat2 = from_target->compatible (from_target, selected); | |
349 | ||
350 | if (compat1 == NULL && compat2 == NULL) | |
351 | { | |
352 | warning (_("Selected architecture %s is not compatible " | |
353 | "with reported target architecture %s"), | |
354 | selected->printable_name, from_target->printable_name); | |
355 | return selected; | |
356 | } | |
357 | ||
358 | if (compat1 == NULL) | |
359 | return compat2; | |
360 | if (compat2 == NULL) | |
361 | return compat1; | |
362 | if (compat1 == compat2) | |
363 | return compat1; | |
364 | ||
365 | /* If the two didn't match, but one of them was a default architecture, | |
366 | assume the more specific one is correct. This handles the case | |
367 | where an executable or target description just says "mips", but | |
368 | the other knows which MIPS variant. */ | |
369 | if (compat1->the_default) | |
370 | return compat2; | |
371 | if (compat2->the_default) | |
372 | return compat1; | |
373 | ||
374 | /* We have no idea which one is better. This is a bug, but not | |
375 | a critical problem; warn the user. */ | |
376 | warning (_("Selected architecture %s is ambiguous with " | |
377 | "reported target architecture %s"), | |
378 | selected->printable_name, from_target->printable_name); | |
379 | return selected; | |
380 | } | |
381 | ||
b4a20239 AC |
382 | /* Functions to manipulate the architecture of the target */ |
383 | ||
384 | enum set_arch { set_arch_auto, set_arch_manual }; | |
385 | ||
7a107747 | 386 | static const struct bfd_arch_info *target_architecture_user; |
b4a20239 | 387 | |
a8cf2722 AC |
388 | static const char *set_architecture_string; |
389 | ||
390 | const char * | |
391 | selected_architecture_name (void) | |
392 | { | |
7a107747 | 393 | if (target_architecture_user == NULL) |
a8cf2722 AC |
394 | return NULL; |
395 | else | |
396 | return set_architecture_string; | |
397 | } | |
b4a20239 | 398 | |
b4a20239 AC |
399 | /* Called if the user enters ``show architecture'' without an |
400 | argument. */ | |
401 | ||
402 | static void | |
7ab04401 AC |
403 | show_architecture (struct ui_file *file, int from_tty, |
404 | struct cmd_list_element *c, const char *value) | |
b4a20239 AC |
405 | { |
406 | const char *arch; | |
407 | arch = TARGET_ARCHITECTURE->printable_name; | |
7a107747 | 408 | if (target_architecture_user == NULL) |
7ab04401 AC |
409 | fprintf_filtered (file, _("\ |
410 | The target architecture is set automatically (currently %s)\n"), arch); | |
b4a20239 | 411 | else |
7ab04401 AC |
412 | fprintf_filtered (file, _("\ |
413 | The target architecture is assumed to be %s\n"), arch); | |
b4a20239 AC |
414 | } |
415 | ||
416 | ||
417 | /* Called if the user enters ``set architecture'' with or without an | |
418 | argument. */ | |
419 | ||
420 | static void | |
421 | set_architecture (char *ignore_args, int from_tty, struct cmd_list_element *c) | |
422 | { | |
7a107747 DJ |
423 | struct gdbarch_info info; |
424 | ||
425 | gdbarch_info_init (&info); | |
426 | ||
b4a20239 AC |
427 | if (strcmp (set_architecture_string, "auto") == 0) |
428 | { | |
7a107747 DJ |
429 | target_architecture_user = NULL; |
430 | if (!gdbarch_update_p (info)) | |
431 | internal_error (__FILE__, __LINE__, | |
432 | _("could not select an architecture automatically")); | |
b4a20239 | 433 | } |
d90cf509 | 434 | else |
b4a20239 | 435 | { |
b4a20239 AC |
436 | info.bfd_arch_info = bfd_scan_arch (set_architecture_string); |
437 | if (info.bfd_arch_info == NULL) | |
8e65ff28 | 438 | internal_error (__FILE__, __LINE__, |
edefbb7c | 439 | _("set_architecture: bfd_scan_arch failed")); |
16f33e29 | 440 | if (gdbarch_update_p (info)) |
7a107747 | 441 | target_architecture_user = info.bfd_arch_info; |
b4a20239 | 442 | else |
edefbb7c | 443 | printf_unfiltered (_("Architecture `%s' not recognized.\n"), |
b4a20239 AC |
444 | set_architecture_string); |
445 | } | |
7ab04401 | 446 | show_architecture (gdb_stdout, from_tty, NULL, NULL); |
b4a20239 AC |
447 | } |
448 | ||
ebdba546 AC |
449 | /* Try to select a global architecture that matches "info". Return |
450 | non-zero if the attempt succeds. */ | |
451 | int | |
452 | gdbarch_update_p (struct gdbarch_info info) | |
453 | { | |
454 | struct gdbarch *new_gdbarch = gdbarch_find_by_info (info); | |
455 | ||
456 | /* If there no architecture by that name, reject the request. */ | |
457 | if (new_gdbarch == NULL) | |
458 | { | |
459 | if (gdbarch_debug) | |
460 | fprintf_unfiltered (gdb_stdlog, "gdbarch_update_p: " | |
461 | "Architecture not found\n"); | |
462 | return 0; | |
463 | } | |
464 | ||
465 | /* If it is the same old architecture, accept the request (but don't | |
466 | swap anything). */ | |
467 | if (new_gdbarch == current_gdbarch) | |
468 | { | |
469 | if (gdbarch_debug) | |
470 | fprintf_unfiltered (gdb_stdlog, "gdbarch_update_p: " | |
471 | "Architecture 0x%08lx (%s) unchanged\n", | |
472 | (long) new_gdbarch, | |
473 | gdbarch_bfd_arch_info (new_gdbarch)->printable_name); | |
474 | return 1; | |
475 | } | |
476 | ||
477 | /* It's a new architecture, swap it in. */ | |
478 | if (gdbarch_debug) | |
479 | fprintf_unfiltered (gdb_stdlog, "gdbarch_update_p: " | |
480 | "New architecture 0x%08lx (%s) selected\n", | |
481 | (long) new_gdbarch, | |
482 | gdbarch_bfd_arch_info (new_gdbarch)->printable_name); | |
483 | deprecated_current_gdbarch_select_hack (new_gdbarch); | |
484 | ||
485 | return 1; | |
486 | } | |
487 | ||
2b026650 MK |
488 | /* Return the architecture for ABFD. If no suitable architecture |
489 | could be find, return NULL. */ | |
490 | ||
491 | struct gdbarch * | |
492 | gdbarch_from_bfd (bfd *abfd) | |
b4a20239 | 493 | { |
2b026650 MK |
494 | struct gdbarch *old_gdbarch = current_gdbarch; |
495 | struct gdbarch *new_gdbarch; | |
d90cf509 | 496 | struct gdbarch_info info; |
2b026650 | 497 | |
7a107747 DJ |
498 | /* If we call gdbarch_find_by_info without filling in info.abfd, |
499 | then it will use the global exec_bfd. That's fine if we don't | |
500 | have one of those either. And that's the only time we should | |
501 | reach here with a NULL ABFD argument - when we are discarding | |
502 | the executable. */ | |
503 | gdb_assert (abfd != NULL || exec_bfd == NULL); | |
504 | ||
d90cf509 AC |
505 | gdbarch_info_init (&info); |
506 | info.abfd = abfd; | |
b60eb90d | 507 | return gdbarch_find_by_info (info); |
2b026650 MK |
508 | } |
509 | ||
510 | /* Set the dynamic target-system-dependent parameters (architecture, | |
511 | byte-order) using information found in the BFD */ | |
512 | ||
513 | void | |
514 | set_gdbarch_from_file (bfd *abfd) | |
515 | { | |
516 | struct gdbarch *gdbarch; | |
517 | ||
518 | gdbarch = gdbarch_from_bfd (abfd); | |
519 | if (gdbarch == NULL) | |
8a3fe4f8 | 520 | error (_("Architecture of file not recognized.")); |
b60eb90d | 521 | deprecated_current_gdbarch_select_hack (gdbarch); |
b4a20239 AC |
522 | } |
523 | ||
524 | /* Initialize the current architecture. Update the ``set | |
525 | architecture'' command so that it specifies a list of valid | |
526 | architectures. */ | |
527 | ||
1ba607ad AC |
528 | #ifdef DEFAULT_BFD_ARCH |
529 | extern const bfd_arch_info_type DEFAULT_BFD_ARCH; | |
530 | static const bfd_arch_info_type *default_bfd_arch = &DEFAULT_BFD_ARCH; | |
531 | #else | |
4b9b3959 | 532 | static const bfd_arch_info_type *default_bfd_arch; |
1ba607ad AC |
533 | #endif |
534 | ||
535 | #ifdef DEFAULT_BFD_VEC | |
536 | extern const bfd_target DEFAULT_BFD_VEC; | |
537 | static const bfd_target *default_bfd_vec = &DEFAULT_BFD_VEC; | |
538 | #else | |
539 | static const bfd_target *default_bfd_vec; | |
540 | #endif | |
541 | ||
7a107747 DJ |
542 | static int default_byte_order = BFD_ENDIAN_UNKNOWN; |
543 | ||
b4a20239 AC |
544 | void |
545 | initialize_current_architecture (void) | |
546 | { | |
547 | const char **arches = gdbarch_printable_names (); | |
b4a20239 | 548 | |
1ba607ad AC |
549 | /* determine a default architecture and byte order. */ |
550 | struct gdbarch_info info; | |
fb6ecb0f | 551 | gdbarch_info_init (&info); |
1ba607ad AC |
552 | |
553 | /* Find a default architecture. */ | |
7a107747 | 554 | if (default_bfd_arch == NULL) |
b4a20239 | 555 | { |
1ba607ad AC |
556 | /* Choose the architecture by taking the first one |
557 | alphabetically. */ | |
558 | const char *chosen = arches[0]; | |
b4a20239 | 559 | const char **arch; |
b4a20239 AC |
560 | for (arch = arches; *arch != NULL; arch++) |
561 | { | |
b4a20239 AC |
562 | if (strcmp (*arch, chosen) < 0) |
563 | chosen = *arch; | |
564 | } | |
565 | if (chosen == NULL) | |
8e65ff28 | 566 | internal_error (__FILE__, __LINE__, |
edefbb7c | 567 | _("initialize_current_architecture: No arch")); |
7a107747 DJ |
568 | default_bfd_arch = bfd_scan_arch (chosen); |
569 | if (default_bfd_arch == NULL) | |
8e65ff28 | 570 | internal_error (__FILE__, __LINE__, |
edefbb7c | 571 | _("initialize_current_architecture: Arch not found")); |
1ba607ad AC |
572 | } |
573 | ||
7a107747 DJ |
574 | info.bfd_arch_info = default_bfd_arch; |
575 | ||
afe64c1a | 576 | /* Take several guesses at a byte order. */ |
7a107747 | 577 | if (default_byte_order == BFD_ENDIAN_UNKNOWN |
1ba607ad AC |
578 | && default_bfd_vec != NULL) |
579 | { | |
580 | /* Extract BFD's default vector's byte order. */ | |
581 | switch (default_bfd_vec->byteorder) | |
582 | { | |
583 | case BFD_ENDIAN_BIG: | |
7a107747 | 584 | default_byte_order = BFD_ENDIAN_BIG; |
1ba607ad AC |
585 | break; |
586 | case BFD_ENDIAN_LITTLE: | |
7a107747 | 587 | default_byte_order = BFD_ENDIAN_LITTLE; |
1ba607ad AC |
588 | break; |
589 | default: | |
590 | break; | |
591 | } | |
592 | } | |
7a107747 | 593 | if (default_byte_order == BFD_ENDIAN_UNKNOWN) |
1ba607ad AC |
594 | { |
595 | /* look for ``*el-*'' in the target name. */ | |
596 | const char *chp; | |
597 | chp = strchr (target_name, '-'); | |
598 | if (chp != NULL | |
599 | && chp - 2 >= target_name | |
600 | && strncmp (chp - 2, "el", 2) == 0) | |
7a107747 | 601 | default_byte_order = BFD_ENDIAN_LITTLE; |
1ba607ad | 602 | } |
7a107747 | 603 | if (default_byte_order == BFD_ENDIAN_UNKNOWN) |
1ba607ad AC |
604 | { |
605 | /* Wire it to big-endian!!! */ | |
7a107747 | 606 | default_byte_order = BFD_ENDIAN_BIG; |
1ba607ad AC |
607 | } |
608 | ||
7a107747 DJ |
609 | info.byte_order = default_byte_order; |
610 | ||
d90cf509 AC |
611 | if (! gdbarch_update_p (info)) |
612 | internal_error (__FILE__, __LINE__, | |
edefbb7c AC |
613 | _("initialize_current_architecture: Selection of " |
614 | "initial architecture failed")); | |
b4a20239 | 615 | |
1ba607ad AC |
616 | /* Create the ``set architecture'' command appending ``auto'' to the |
617 | list of architectures. */ | |
b4a20239 AC |
618 | { |
619 | struct cmd_list_element *c; | |
620 | /* Append ``auto''. */ | |
621 | int nr; | |
622 | for (nr = 0; arches[nr] != NULL; nr++); | |
623 | arches = xrealloc (arches, sizeof (char*) * (nr + 2)); | |
624 | arches[nr + 0] = "auto"; | |
625 | arches[nr + 1] = NULL; | |
7ab04401 AC |
626 | add_setshow_enum_cmd ("architecture", class_support, |
627 | arches, &set_architecture_string, _("\ | |
628 | Set architecture of target."), _("\ | |
629 | Show architecture of target."), NULL, | |
630 | set_architecture, show_architecture, | |
631 | &setlist, &showlist); | |
b4a20239 | 632 | add_alias_cmd ("processor", "architecture", class_support, 1, &setlist); |
b4a20239 AC |
633 | } |
634 | } | |
635 | ||
636 | ||
fb6ecb0f AC |
637 | /* Initialize a gdbarch info to values that will be automatically |
638 | overridden. Note: Originally, this ``struct info'' was initialized | |
ce2826aa | 639 | using memset(0). Unfortunately, that ran into problems, namely |
fb6ecb0f AC |
640 | BFD_ENDIAN_BIG is zero. An explicit initialization function that |
641 | can explicitly set each field to a well defined value is used. */ | |
642 | ||
643 | void | |
644 | gdbarch_info_init (struct gdbarch_info *info) | |
645 | { | |
646 | memset (info, 0, sizeof (struct gdbarch_info)); | |
428721aa | 647 | info->byte_order = BFD_ENDIAN_UNKNOWN; |
4be87837 | 648 | info->osabi = GDB_OSABI_UNINITIALIZED; |
fb6ecb0f AC |
649 | } |
650 | ||
100bcc3f | 651 | /* Similar to init, but this time fill in the blanks. Information is |
7a107747 DJ |
652 | obtained from the global "set ..." options and explicitly |
653 | initialized INFO fields. */ | |
bf922ad9 AC |
654 | |
655 | void | |
7a107747 | 656 | gdbarch_info_fill (struct gdbarch_info *info) |
bf922ad9 | 657 | { |
7a107747 DJ |
658 | /* Check for the current file. */ |
659 | if (info->abfd == NULL) | |
660 | info->abfd = exec_bfd; | |
661 | ||
424163ea DJ |
662 | /* Check for the current target description. */ |
663 | if (info->target_desc == NULL) | |
664 | info->target_desc = target_current_description (); | |
665 | ||
bf922ad9 AC |
666 | /* "(gdb) set architecture ...". */ |
667 | if (info->bfd_arch_info == NULL | |
7a107747 DJ |
668 | && target_architecture_user) |
669 | info->bfd_arch_info = target_architecture_user; | |
424163ea | 670 | /* From the file. */ |
bf922ad9 AC |
671 | if (info->bfd_arch_info == NULL |
672 | && info->abfd != NULL | |
673 | && bfd_get_arch (info->abfd) != bfd_arch_unknown | |
674 | && bfd_get_arch (info->abfd) != bfd_arch_obscure) | |
675 | info->bfd_arch_info = bfd_get_arch_info (info->abfd); | |
23181151 DJ |
676 | /* From the target. */ |
677 | if (info->target_desc != NULL) | |
678 | info->bfd_arch_info = choose_architecture_for_target | |
679 | (info->bfd_arch_info, tdesc_architecture (info->target_desc)); | |
7a107747 DJ |
680 | /* From the default. */ |
681 | if (info->bfd_arch_info == NULL) | |
682 | info->bfd_arch_info = default_bfd_arch; | |
bf922ad9 AC |
683 | |
684 | /* "(gdb) set byte-order ...". */ | |
685 | if (info->byte_order == BFD_ENDIAN_UNKNOWN | |
7a107747 DJ |
686 | && target_byte_order_user != BFD_ENDIAN_UNKNOWN) |
687 | info->byte_order = target_byte_order_user; | |
bf922ad9 AC |
688 | /* From the INFO struct. */ |
689 | if (info->byte_order == BFD_ENDIAN_UNKNOWN | |
690 | && info->abfd != NULL) | |
691 | info->byte_order = (bfd_big_endian (info->abfd) ? BFD_ENDIAN_BIG | |
7a107747 DJ |
692 | : bfd_little_endian (info->abfd) ? BFD_ENDIAN_LITTLE |
693 | : BFD_ENDIAN_UNKNOWN); | |
694 | /* From the default. */ | |
695 | if (info->byte_order == BFD_ENDIAN_UNKNOWN) | |
696 | info->byte_order = default_byte_order; | |
bf922ad9 AC |
697 | |
698 | /* "(gdb) set osabi ...". Handled by gdbarch_lookup_osabi. */ | |
699 | if (info->osabi == GDB_OSABI_UNINITIALIZED) | |
700 | info->osabi = gdbarch_lookup_osabi (info->abfd); | |
bf922ad9 AC |
701 | |
702 | /* Must have at least filled in the architecture. */ | |
703 | gdb_assert (info->bfd_arch_info != NULL); | |
704 | } | |
705 | ||
c0e8c252 AC |
706 | /* */ |
707 | ||
a78f21af | 708 | extern initialize_file_ftype _initialize_gdbarch_utils; /* -Wmissing-prototypes */ |
c0e8c252 AC |
709 | |
710 | void | |
b4a20239 | 711 | _initialize_gdbarch_utils (void) |
c0e8c252 | 712 | { |
b4a20239 | 713 | struct cmd_list_element *c; |
7ab04401 AC |
714 | add_setshow_enum_cmd ("endian", class_support, |
715 | endian_enum, &set_endian_string, _("\ | |
716 | Set endianness of target."), _("\ | |
717 | Show endianness of target."), NULL, | |
718 | set_endian, show_endian, | |
719 | &setlist, &showlist); | |
c0e8c252 | 720 | } |