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. */ | |
86 | gdb_assert (regnum >= 0 && regnum < NUM_REGS); | |
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). */ | |
91 | if (REGISTER_NAME (regnum) != NULL | |
92 | && REGISTER_NAME (regnum)[0] != '\0') | |
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 | ||
c0e8c252 | 122 | void |
f6684c31 AC |
123 | generic_remote_translate_xfer_address (struct gdbarch *gdbarch, |
124 | struct regcache *regcache, | |
125 | CORE_ADDR gdb_addr, int gdb_len, | |
c0e8c252 AC |
126 | CORE_ADDR * rem_addr, int *rem_len) |
127 | { | |
128 | *rem_addr = gdb_addr; | |
129 | *rem_len = gdb_len; | |
130 | } | |
131 | ||
3339cf8b AC |
132 | /* Helper functions for INNER_THAN */ |
133 | ||
134 | int | |
fba45db2 | 135 | core_addr_lessthan (CORE_ADDR lhs, CORE_ADDR rhs) |
3339cf8b AC |
136 | { |
137 | return (lhs < rhs); | |
138 | } | |
139 | ||
140 | int | |
fba45db2 | 141 | core_addr_greaterthan (CORE_ADDR lhs, CORE_ADDR rhs) |
3339cf8b AC |
142 | { |
143 | return (lhs > rhs); | |
144 | } | |
145 | ||
193e3b1a AC |
146 | /* Misc helper functions for targets. */ |
147 | ||
f517ea4e | 148 | CORE_ADDR |
875e1767 | 149 | core_addr_identity (CORE_ADDR addr) |
f517ea4e PS |
150 | { |
151 | return addr; | |
152 | } | |
153 | ||
e2d0e7eb AC |
154 | CORE_ADDR |
155 | convert_from_func_ptr_addr_identity (struct gdbarch *gdbarch, CORE_ADDR addr, | |
156 | struct target_ops *targ) | |
157 | { | |
158 | return addr; | |
159 | } | |
160 | ||
88c72b7d AC |
161 | int |
162 | no_op_reg_to_regnum (int reg) | |
163 | { | |
164 | return reg; | |
165 | } | |
166 | ||
a2cf933a EZ |
167 | void |
168 | default_elf_make_msymbol_special (asymbol *sym, struct minimal_symbol *msym) | |
169 | { | |
170 | return; | |
171 | } | |
172 | ||
173 | void | |
174 | default_coff_make_msymbol_special (int val, struct minimal_symbol *msym) | |
175 | { | |
176 | return; | |
177 | } | |
178 | ||
01fb7433 AC |
179 | int |
180 | cannot_register_not (int regnum) | |
181 | { | |
182 | return 0; | |
183 | } | |
39d4ef09 AC |
184 | |
185 | /* Legacy version of target_virtual_frame_pointer(). Assumes that | |
0ba6dca9 AC |
186 | there is an DEPRECATED_FP_REGNUM and that it is the same, cooked or |
187 | raw. */ | |
39d4ef09 AC |
188 | |
189 | void | |
190 | legacy_virtual_frame_pointer (CORE_ADDR pc, | |
191 | int *frame_regnum, | |
192 | LONGEST *frame_offset) | |
193 | { | |
20bcf01c AC |
194 | /* FIXME: cagney/2002-09-13: This code is used when identifying the |
195 | frame pointer of the current PC. It is assuming that a single | |
196 | register and an offset can determine this. I think it should | |
197 | instead generate a byte code expression as that would work better | |
198 | with things like Dwarf2's CFI. */ | |
0ba6dca9 AC |
199 | if (DEPRECATED_FP_REGNUM >= 0 && DEPRECATED_FP_REGNUM < NUM_REGS) |
200 | *frame_regnum = DEPRECATED_FP_REGNUM; | |
20bcf01c AC |
201 | else if (SP_REGNUM >= 0 && SP_REGNUM < NUM_REGS) |
202 | *frame_regnum = SP_REGNUM; | |
203 | else | |
204 | /* Should this be an internal error? I guess so, it is reflecting | |
205 | an architectural limitation in the current design. */ | |
edefbb7c | 206 | internal_error (__FILE__, __LINE__, _("No virtual frame pointer available")); |
39d4ef09 AC |
207 | *frame_offset = 0; |
208 | } | |
46cd78fb | 209 | |
b2e75d78 AC |
210 | /* Assume the world is sane, every register's virtual and real size |
211 | is identical. */ | |
46cd78fb AC |
212 | |
213 | int | |
b2e75d78 | 214 | generic_register_size (int regnum) |
46cd78fb AC |
215 | { |
216 | gdb_assert (regnum >= 0 && regnum < NUM_REGS + NUM_PSEUDO_REGS); | |
7b9ee6a8 | 217 | return TYPE_LENGTH (register_type (current_gdbarch, regnum)); |
ce29138a MS |
218 | } |
219 | ||
a7e3c2ad AC |
220 | /* Assume all registers are adjacent. */ |
221 | ||
222 | int | |
223 | generic_register_byte (int regnum) | |
224 | { | |
225 | int byte; | |
226 | int i; | |
227 | gdb_assert (regnum >= 0 && regnum < NUM_REGS + NUM_PSEUDO_REGS); | |
228 | byte = 0; | |
229 | for (i = 0; i < regnum; i++) | |
230 | { | |
0aa7e1aa | 231 | byte += generic_register_size (i); |
a7e3c2ad AC |
232 | } |
233 | return byte; | |
234 | } | |
235 | ||
d7bd68ca AC |
236 | \f |
237 | int | |
238 | legacy_pc_in_sigtramp (CORE_ADDR pc, char *name) | |
239 | { | |
8c6b0e06 | 240 | #if defined (DEPRECATED_IN_SIGTRAMP) |
dbfe4626 | 241 | return DEPRECATED_IN_SIGTRAMP (pc, name); |
8c6b0e06 AC |
242 | #else |
243 | return name && strcmp ("_sigtramp", name) == 0; | |
db54fef4 | 244 | #endif |
d7bd68ca AC |
245 | } |
246 | ||
13d01224 | 247 | int |
a1f4a1b6 | 248 | generic_convert_register_p (int regnum, struct type *type) |
13d01224 | 249 | { |
9730f241 | 250 | return 0; |
13d01224 AC |
251 | } |
252 | ||
192cb3d4 MK |
253 | int |
254 | default_stabs_argument_has_addr (struct gdbarch *gdbarch, struct type *type) | |
255 | { | |
192cb3d4 MK |
256 | return 0; |
257 | } | |
258 | ||
3ca64954 RC |
259 | int |
260 | generic_instruction_nullified (struct gdbarch *gdbarch, | |
261 | struct regcache *regcache) | |
262 | { | |
263 | return 0; | |
264 | } | |
265 | ||
123dc839 DJ |
266 | int |
267 | default_remote_register_number (struct gdbarch *gdbarch, | |
268 | int regno) | |
269 | { | |
270 | return regno; | |
271 | } | |
272 | ||
01fb7433 | 273 | \f |
b4a20239 AC |
274 | /* Functions to manipulate the endianness of the target. */ |
275 | ||
7a107747 | 276 | static int target_byte_order_user = BFD_ENDIAN_UNKNOWN; |
b4a20239 | 277 | |
53904c9e AC |
278 | static const char endian_big[] = "big"; |
279 | static const char endian_little[] = "little"; | |
280 | static const char endian_auto[] = "auto"; | |
281 | static const char *endian_enum[] = | |
b4a20239 AC |
282 | { |
283 | endian_big, | |
284 | endian_little, | |
285 | endian_auto, | |
286 | NULL, | |
287 | }; | |
53904c9e | 288 | static const char *set_endian_string; |
b4a20239 | 289 | |
b6d373df DJ |
290 | enum bfd_endian |
291 | selected_byte_order (void) | |
292 | { | |
293 | if (target_byte_order_user != BFD_ENDIAN_UNKNOWN) | |
294 | return TARGET_BYTE_ORDER; | |
295 | else | |
296 | return BFD_ENDIAN_UNKNOWN; | |
297 | } | |
298 | ||
b4a20239 AC |
299 | /* Called by ``show endian''. */ |
300 | ||
301 | static void | |
7ab04401 AC |
302 | show_endian (struct ui_file *file, int from_tty, struct cmd_list_element *c, |
303 | const char *value) | |
b4a20239 | 304 | { |
7b6b9e83 | 305 | if (target_byte_order_user == BFD_ENDIAN_UNKNOWN) |
edefbb7c | 306 | if (TARGET_BYTE_ORDER == BFD_ENDIAN_BIG) |
7ab04401 AC |
307 | fprintf_unfiltered (file, _("The target endianness is set automatically " |
308 | "(currently big endian)\n")); | |
edefbb7c | 309 | else |
7ab04401 | 310 | fprintf_unfiltered (file, _("The target endianness is set automatically " |
edefbb7c | 311 | "(currently little endian)\n")); |
b4a20239 | 312 | else |
edefbb7c | 313 | if (TARGET_BYTE_ORDER == BFD_ENDIAN_BIG) |
7ab04401 AC |
314 | fprintf_unfiltered (file, |
315 | _("The target is assumed to be big endian\n")); | |
316 | else | |
317 | fprintf_unfiltered (file, | |
318 | _("The target is assumed to be little endian\n")); | |
b4a20239 AC |
319 | } |
320 | ||
321 | static void | |
322 | set_endian (char *ignore_args, int from_tty, struct cmd_list_element *c) | |
323 | { | |
7a107747 DJ |
324 | struct gdbarch_info info; |
325 | ||
326 | gdbarch_info_init (&info); | |
327 | ||
3fd3d7d2 | 328 | if (set_endian_string == endian_auto) |
b4a20239 | 329 | { |
7a107747 DJ |
330 | target_byte_order_user = BFD_ENDIAN_UNKNOWN; |
331 | if (! gdbarch_update_p (info)) | |
332 | internal_error (__FILE__, __LINE__, | |
333 | _("set_endian: architecture update failed")); | |
b4a20239 AC |
334 | } |
335 | else if (set_endian_string == endian_little) | |
336 | { | |
d90cf509 AC |
337 | info.byte_order = BFD_ENDIAN_LITTLE; |
338 | if (! gdbarch_update_p (info)) | |
edefbb7c | 339 | printf_unfiltered (_("Little endian target not supported by GDB\n")); |
7a107747 DJ |
340 | else |
341 | target_byte_order_user = BFD_ENDIAN_LITTLE; | |
b4a20239 AC |
342 | } |
343 | else if (set_endian_string == endian_big) | |
344 | { | |
d90cf509 AC |
345 | info.byte_order = BFD_ENDIAN_BIG; |
346 | if (! gdbarch_update_p (info)) | |
edefbb7c | 347 | printf_unfiltered (_("Big endian target not supported by GDB\n")); |
7a107747 DJ |
348 | else |
349 | target_byte_order_user = BFD_ENDIAN_BIG; | |
b4a20239 AC |
350 | } |
351 | else | |
8e65ff28 | 352 | internal_error (__FILE__, __LINE__, |
edefbb7c | 353 | _("set_endian: bad value")); |
7a107747 | 354 | |
7ab04401 | 355 | show_endian (gdb_stdout, from_tty, NULL, NULL); |
b4a20239 AC |
356 | } |
357 | ||
23181151 DJ |
358 | /* Given SELECTED, a currently selected BFD architecture, and |
359 | FROM_TARGET, a BFD architecture reported by the target description, | |
360 | return what architecture to use. Either may be NULL; if both are | |
361 | specified, we use the more specific. If the two are obviously | |
362 | incompatible, warn the user. */ | |
363 | ||
364 | static const struct bfd_arch_info * | |
365 | choose_architecture_for_target (const struct bfd_arch_info *selected, | |
366 | const struct bfd_arch_info *from_target) | |
367 | { | |
368 | const struct bfd_arch_info *compat1, *compat2; | |
369 | ||
370 | if (selected == NULL) | |
371 | return from_target; | |
372 | ||
373 | if (from_target == NULL) | |
374 | return selected; | |
375 | ||
376 | /* struct bfd_arch_info objects are singletons: that is, there's | |
377 | supposed to be exactly one instance for a given machine. So you | |
378 | can tell whether two are equivalent by comparing pointers. */ | |
379 | if (from_target == selected) | |
380 | return selected; | |
381 | ||
382 | /* BFD's 'A->compatible (A, B)' functions return zero if A and B are | |
383 | incompatible. But if they are compatible, it returns the 'more | |
384 | featureful' of the two arches. That is, if A can run code | |
385 | written for B, but B can't run code written for A, then it'll | |
386 | return A. | |
387 | ||
388 | Some targets (e.g. MIPS as of 2006-12-04) don't fully | |
389 | implement this, instead always returning NULL or the first | |
390 | argument. We detect that case by checking both directions. */ | |
391 | ||
392 | compat1 = selected->compatible (selected, from_target); | |
393 | compat2 = from_target->compatible (from_target, selected); | |
394 | ||
395 | if (compat1 == NULL && compat2 == NULL) | |
396 | { | |
397 | warning (_("Selected architecture %s is not compatible " | |
398 | "with reported target architecture %s"), | |
399 | selected->printable_name, from_target->printable_name); | |
400 | return selected; | |
401 | } | |
402 | ||
403 | if (compat1 == NULL) | |
404 | return compat2; | |
405 | if (compat2 == NULL) | |
406 | return compat1; | |
407 | if (compat1 == compat2) | |
408 | return compat1; | |
409 | ||
410 | /* If the two didn't match, but one of them was a default architecture, | |
411 | assume the more specific one is correct. This handles the case | |
412 | where an executable or target description just says "mips", but | |
413 | the other knows which MIPS variant. */ | |
414 | if (compat1->the_default) | |
415 | return compat2; | |
416 | if (compat2->the_default) | |
417 | return compat1; | |
418 | ||
419 | /* We have no idea which one is better. This is a bug, but not | |
420 | a critical problem; warn the user. */ | |
421 | warning (_("Selected architecture %s is ambiguous with " | |
422 | "reported target architecture %s"), | |
423 | selected->printable_name, from_target->printable_name); | |
424 | return selected; | |
425 | } | |
426 | ||
b4a20239 AC |
427 | /* Functions to manipulate the architecture of the target */ |
428 | ||
429 | enum set_arch { set_arch_auto, set_arch_manual }; | |
430 | ||
7a107747 | 431 | static const struct bfd_arch_info *target_architecture_user; |
b4a20239 | 432 | |
a8cf2722 AC |
433 | static const char *set_architecture_string; |
434 | ||
435 | const char * | |
436 | selected_architecture_name (void) | |
437 | { | |
7a107747 | 438 | if (target_architecture_user == NULL) |
a8cf2722 AC |
439 | return NULL; |
440 | else | |
441 | return set_architecture_string; | |
442 | } | |
b4a20239 | 443 | |
b4a20239 AC |
444 | /* Called if the user enters ``show architecture'' without an |
445 | argument. */ | |
446 | ||
447 | static void | |
7ab04401 AC |
448 | show_architecture (struct ui_file *file, int from_tty, |
449 | struct cmd_list_element *c, const char *value) | |
b4a20239 AC |
450 | { |
451 | const char *arch; | |
452 | arch = TARGET_ARCHITECTURE->printable_name; | |
7a107747 | 453 | if (target_architecture_user == NULL) |
7ab04401 AC |
454 | fprintf_filtered (file, _("\ |
455 | The target architecture is set automatically (currently %s)\n"), arch); | |
b4a20239 | 456 | else |
7ab04401 AC |
457 | fprintf_filtered (file, _("\ |
458 | The target architecture is assumed to be %s\n"), arch); | |
b4a20239 AC |
459 | } |
460 | ||
461 | ||
462 | /* Called if the user enters ``set architecture'' with or without an | |
463 | argument. */ | |
464 | ||
465 | static void | |
466 | set_architecture (char *ignore_args, int from_tty, struct cmd_list_element *c) | |
467 | { | |
7a107747 DJ |
468 | struct gdbarch_info info; |
469 | ||
470 | gdbarch_info_init (&info); | |
471 | ||
b4a20239 AC |
472 | if (strcmp (set_architecture_string, "auto") == 0) |
473 | { | |
7a107747 DJ |
474 | target_architecture_user = NULL; |
475 | if (!gdbarch_update_p (info)) | |
476 | internal_error (__FILE__, __LINE__, | |
477 | _("could not select an architecture automatically")); | |
b4a20239 | 478 | } |
d90cf509 | 479 | else |
b4a20239 | 480 | { |
b4a20239 AC |
481 | info.bfd_arch_info = bfd_scan_arch (set_architecture_string); |
482 | if (info.bfd_arch_info == NULL) | |
8e65ff28 | 483 | internal_error (__FILE__, __LINE__, |
edefbb7c | 484 | _("set_architecture: bfd_scan_arch failed")); |
16f33e29 | 485 | if (gdbarch_update_p (info)) |
7a107747 | 486 | target_architecture_user = info.bfd_arch_info; |
b4a20239 | 487 | else |
edefbb7c | 488 | printf_unfiltered (_("Architecture `%s' not recognized.\n"), |
b4a20239 AC |
489 | set_architecture_string); |
490 | } | |
7ab04401 | 491 | show_architecture (gdb_stdout, from_tty, NULL, NULL); |
b4a20239 AC |
492 | } |
493 | ||
ebdba546 AC |
494 | /* Try to select a global architecture that matches "info". Return |
495 | non-zero if the attempt succeds. */ | |
496 | int | |
497 | gdbarch_update_p (struct gdbarch_info info) | |
498 | { | |
499 | struct gdbarch *new_gdbarch = gdbarch_find_by_info (info); | |
500 | ||
501 | /* If there no architecture by that name, reject the request. */ | |
502 | if (new_gdbarch == NULL) | |
503 | { | |
504 | if (gdbarch_debug) | |
505 | fprintf_unfiltered (gdb_stdlog, "gdbarch_update_p: " | |
506 | "Architecture not found\n"); | |
507 | return 0; | |
508 | } | |
509 | ||
510 | /* If it is the same old architecture, accept the request (but don't | |
511 | swap anything). */ | |
512 | if (new_gdbarch == current_gdbarch) | |
513 | { | |
514 | if (gdbarch_debug) | |
515 | fprintf_unfiltered (gdb_stdlog, "gdbarch_update_p: " | |
516 | "Architecture 0x%08lx (%s) unchanged\n", | |
517 | (long) new_gdbarch, | |
518 | gdbarch_bfd_arch_info (new_gdbarch)->printable_name); | |
519 | return 1; | |
520 | } | |
521 | ||
522 | /* It's a new architecture, swap it in. */ | |
523 | if (gdbarch_debug) | |
524 | fprintf_unfiltered (gdb_stdlog, "gdbarch_update_p: " | |
525 | "New architecture 0x%08lx (%s) selected\n", | |
526 | (long) new_gdbarch, | |
527 | gdbarch_bfd_arch_info (new_gdbarch)->printable_name); | |
528 | deprecated_current_gdbarch_select_hack (new_gdbarch); | |
529 | ||
530 | return 1; | |
531 | } | |
532 | ||
2b026650 MK |
533 | /* Return the architecture for ABFD. If no suitable architecture |
534 | could be find, return NULL. */ | |
535 | ||
536 | struct gdbarch * | |
537 | gdbarch_from_bfd (bfd *abfd) | |
b4a20239 | 538 | { |
2b026650 MK |
539 | struct gdbarch *old_gdbarch = current_gdbarch; |
540 | struct gdbarch *new_gdbarch; | |
d90cf509 | 541 | struct gdbarch_info info; |
2b026650 | 542 | |
7a107747 DJ |
543 | /* If we call gdbarch_find_by_info without filling in info.abfd, |
544 | then it will use the global exec_bfd. That's fine if we don't | |
545 | have one of those either. And that's the only time we should | |
546 | reach here with a NULL ABFD argument - when we are discarding | |
547 | the executable. */ | |
548 | gdb_assert (abfd != NULL || exec_bfd == NULL); | |
549 | ||
d90cf509 AC |
550 | gdbarch_info_init (&info); |
551 | info.abfd = abfd; | |
b60eb90d | 552 | return gdbarch_find_by_info (info); |
2b026650 MK |
553 | } |
554 | ||
555 | /* Set the dynamic target-system-dependent parameters (architecture, | |
556 | byte-order) using information found in the BFD */ | |
557 | ||
558 | void | |
559 | set_gdbarch_from_file (bfd *abfd) | |
560 | { | |
561 | struct gdbarch *gdbarch; | |
562 | ||
563 | gdbarch = gdbarch_from_bfd (abfd); | |
564 | if (gdbarch == NULL) | |
8a3fe4f8 | 565 | error (_("Architecture of file not recognized.")); |
b60eb90d | 566 | deprecated_current_gdbarch_select_hack (gdbarch); |
b4a20239 AC |
567 | } |
568 | ||
569 | /* Initialize the current architecture. Update the ``set | |
570 | architecture'' command so that it specifies a list of valid | |
571 | architectures. */ | |
572 | ||
1ba607ad AC |
573 | #ifdef DEFAULT_BFD_ARCH |
574 | extern const bfd_arch_info_type DEFAULT_BFD_ARCH; | |
575 | static const bfd_arch_info_type *default_bfd_arch = &DEFAULT_BFD_ARCH; | |
576 | #else | |
4b9b3959 | 577 | static const bfd_arch_info_type *default_bfd_arch; |
1ba607ad AC |
578 | #endif |
579 | ||
580 | #ifdef DEFAULT_BFD_VEC | |
581 | extern const bfd_target DEFAULT_BFD_VEC; | |
582 | static const bfd_target *default_bfd_vec = &DEFAULT_BFD_VEC; | |
583 | #else | |
584 | static const bfd_target *default_bfd_vec; | |
585 | #endif | |
586 | ||
7a107747 DJ |
587 | static int default_byte_order = BFD_ENDIAN_UNKNOWN; |
588 | ||
b4a20239 AC |
589 | void |
590 | initialize_current_architecture (void) | |
591 | { | |
592 | const char **arches = gdbarch_printable_names (); | |
b4a20239 | 593 | |
1ba607ad AC |
594 | /* determine a default architecture and byte order. */ |
595 | struct gdbarch_info info; | |
fb6ecb0f | 596 | gdbarch_info_init (&info); |
1ba607ad AC |
597 | |
598 | /* Find a default architecture. */ | |
7a107747 | 599 | if (default_bfd_arch == NULL) |
b4a20239 | 600 | { |
1ba607ad AC |
601 | /* Choose the architecture by taking the first one |
602 | alphabetically. */ | |
603 | const char *chosen = arches[0]; | |
b4a20239 | 604 | const char **arch; |
b4a20239 AC |
605 | for (arch = arches; *arch != NULL; arch++) |
606 | { | |
b4a20239 AC |
607 | if (strcmp (*arch, chosen) < 0) |
608 | chosen = *arch; | |
609 | } | |
610 | if (chosen == NULL) | |
8e65ff28 | 611 | internal_error (__FILE__, __LINE__, |
edefbb7c | 612 | _("initialize_current_architecture: No arch")); |
7a107747 DJ |
613 | default_bfd_arch = bfd_scan_arch (chosen); |
614 | if (default_bfd_arch == NULL) | |
8e65ff28 | 615 | internal_error (__FILE__, __LINE__, |
edefbb7c | 616 | _("initialize_current_architecture: Arch not found")); |
1ba607ad AC |
617 | } |
618 | ||
7a107747 DJ |
619 | info.bfd_arch_info = default_bfd_arch; |
620 | ||
afe64c1a | 621 | /* Take several guesses at a byte order. */ |
7a107747 | 622 | if (default_byte_order == BFD_ENDIAN_UNKNOWN |
1ba607ad AC |
623 | && default_bfd_vec != NULL) |
624 | { | |
625 | /* Extract BFD's default vector's byte order. */ | |
626 | switch (default_bfd_vec->byteorder) | |
627 | { | |
628 | case BFD_ENDIAN_BIG: | |
7a107747 | 629 | default_byte_order = BFD_ENDIAN_BIG; |
1ba607ad AC |
630 | break; |
631 | case BFD_ENDIAN_LITTLE: | |
7a107747 | 632 | default_byte_order = BFD_ENDIAN_LITTLE; |
1ba607ad AC |
633 | break; |
634 | default: | |
635 | break; | |
636 | } | |
637 | } | |
7a107747 | 638 | if (default_byte_order == BFD_ENDIAN_UNKNOWN) |
1ba607ad AC |
639 | { |
640 | /* look for ``*el-*'' in the target name. */ | |
641 | const char *chp; | |
642 | chp = strchr (target_name, '-'); | |
643 | if (chp != NULL | |
644 | && chp - 2 >= target_name | |
645 | && strncmp (chp - 2, "el", 2) == 0) | |
7a107747 | 646 | default_byte_order = BFD_ENDIAN_LITTLE; |
1ba607ad | 647 | } |
7a107747 | 648 | if (default_byte_order == BFD_ENDIAN_UNKNOWN) |
1ba607ad AC |
649 | { |
650 | /* Wire it to big-endian!!! */ | |
7a107747 | 651 | default_byte_order = BFD_ENDIAN_BIG; |
1ba607ad AC |
652 | } |
653 | ||
7a107747 DJ |
654 | info.byte_order = default_byte_order; |
655 | ||
d90cf509 AC |
656 | if (! gdbarch_update_p (info)) |
657 | internal_error (__FILE__, __LINE__, | |
edefbb7c AC |
658 | _("initialize_current_architecture: Selection of " |
659 | "initial architecture failed")); | |
b4a20239 | 660 | |
1ba607ad AC |
661 | /* Create the ``set architecture'' command appending ``auto'' to the |
662 | list of architectures. */ | |
b4a20239 AC |
663 | { |
664 | struct cmd_list_element *c; | |
665 | /* Append ``auto''. */ | |
666 | int nr; | |
667 | for (nr = 0; arches[nr] != NULL; nr++); | |
668 | arches = xrealloc (arches, sizeof (char*) * (nr + 2)); | |
669 | arches[nr + 0] = "auto"; | |
670 | arches[nr + 1] = NULL; | |
7ab04401 AC |
671 | add_setshow_enum_cmd ("architecture", class_support, |
672 | arches, &set_architecture_string, _("\ | |
673 | Set architecture of target."), _("\ | |
674 | Show architecture of target."), NULL, | |
675 | set_architecture, show_architecture, | |
676 | &setlist, &showlist); | |
b4a20239 | 677 | add_alias_cmd ("processor", "architecture", class_support, 1, &setlist); |
b4a20239 AC |
678 | } |
679 | } | |
680 | ||
681 | ||
fb6ecb0f AC |
682 | /* Initialize a gdbarch info to values that will be automatically |
683 | overridden. Note: Originally, this ``struct info'' was initialized | |
ce2826aa | 684 | using memset(0). Unfortunately, that ran into problems, namely |
fb6ecb0f AC |
685 | BFD_ENDIAN_BIG is zero. An explicit initialization function that |
686 | can explicitly set each field to a well defined value is used. */ | |
687 | ||
688 | void | |
689 | gdbarch_info_init (struct gdbarch_info *info) | |
690 | { | |
691 | memset (info, 0, sizeof (struct gdbarch_info)); | |
428721aa | 692 | info->byte_order = BFD_ENDIAN_UNKNOWN; |
4be87837 | 693 | info->osabi = GDB_OSABI_UNINITIALIZED; |
fb6ecb0f AC |
694 | } |
695 | ||
100bcc3f | 696 | /* Similar to init, but this time fill in the blanks. Information is |
7a107747 DJ |
697 | obtained from the global "set ..." options and explicitly |
698 | initialized INFO fields. */ | |
bf922ad9 AC |
699 | |
700 | void | |
7a107747 | 701 | gdbarch_info_fill (struct gdbarch_info *info) |
bf922ad9 | 702 | { |
7a107747 DJ |
703 | /* Check for the current file. */ |
704 | if (info->abfd == NULL) | |
705 | info->abfd = exec_bfd; | |
706 | ||
424163ea DJ |
707 | /* Check for the current target description. */ |
708 | if (info->target_desc == NULL) | |
709 | info->target_desc = target_current_description (); | |
710 | ||
bf922ad9 AC |
711 | /* "(gdb) set architecture ...". */ |
712 | if (info->bfd_arch_info == NULL | |
7a107747 DJ |
713 | && target_architecture_user) |
714 | info->bfd_arch_info = target_architecture_user; | |
424163ea | 715 | /* From the file. */ |
bf922ad9 AC |
716 | if (info->bfd_arch_info == NULL |
717 | && info->abfd != NULL | |
718 | && bfd_get_arch (info->abfd) != bfd_arch_unknown | |
719 | && bfd_get_arch (info->abfd) != bfd_arch_obscure) | |
720 | info->bfd_arch_info = bfd_get_arch_info (info->abfd); | |
23181151 DJ |
721 | /* From the target. */ |
722 | if (info->target_desc != NULL) | |
723 | info->bfd_arch_info = choose_architecture_for_target | |
724 | (info->bfd_arch_info, tdesc_architecture (info->target_desc)); | |
7a107747 DJ |
725 | /* From the default. */ |
726 | if (info->bfd_arch_info == NULL) | |
727 | info->bfd_arch_info = default_bfd_arch; | |
bf922ad9 AC |
728 | |
729 | /* "(gdb) set byte-order ...". */ | |
730 | if (info->byte_order == BFD_ENDIAN_UNKNOWN | |
7a107747 DJ |
731 | && target_byte_order_user != BFD_ENDIAN_UNKNOWN) |
732 | info->byte_order = target_byte_order_user; | |
bf922ad9 AC |
733 | /* From the INFO struct. */ |
734 | if (info->byte_order == BFD_ENDIAN_UNKNOWN | |
735 | && info->abfd != NULL) | |
736 | info->byte_order = (bfd_big_endian (info->abfd) ? BFD_ENDIAN_BIG | |
7a107747 DJ |
737 | : bfd_little_endian (info->abfd) ? BFD_ENDIAN_LITTLE |
738 | : BFD_ENDIAN_UNKNOWN); | |
739 | /* From the default. */ | |
740 | if (info->byte_order == BFD_ENDIAN_UNKNOWN) | |
741 | info->byte_order = default_byte_order; | |
bf922ad9 AC |
742 | |
743 | /* "(gdb) set osabi ...". Handled by gdbarch_lookup_osabi. */ | |
744 | if (info->osabi == GDB_OSABI_UNINITIALIZED) | |
745 | info->osabi = gdbarch_lookup_osabi (info->abfd); | |
bf922ad9 AC |
746 | |
747 | /* Must have at least filled in the architecture. */ | |
748 | gdb_assert (info->bfd_arch_info != NULL); | |
749 | } | |
750 | ||
c0e8c252 AC |
751 | /* */ |
752 | ||
a78f21af | 753 | extern initialize_file_ftype _initialize_gdbarch_utils; /* -Wmissing-prototypes */ |
c0e8c252 AC |
754 | |
755 | void | |
b4a20239 | 756 | _initialize_gdbarch_utils (void) |
c0e8c252 | 757 | { |
b4a20239 | 758 | struct cmd_list_element *c; |
7ab04401 AC |
759 | add_setshow_enum_cmd ("endian", class_support, |
760 | endian_enum, &set_endian_string, _("\ | |
761 | Set endianness of target."), _("\ | |
762 | Show endianness of target."), NULL, | |
763 | set_endian, show_endian, | |
764 | &setlist, &showlist); | |
c0e8c252 | 765 | } |