Commit | Line | Data |
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c0e8c252 | 1 | /* Dynamic architecture support for GDB, the GNU debugger. |
f4f9705a | 2 | |
42a4f53d | 3 | Copyright (C) 1998-2019 Free Software Foundation, Inc. |
c0e8c252 AC |
4 | |
5 | This file is part of GDB. | |
6 | ||
7 | This program is free software; you can redistribute it and/or modify | |
8 | it under the terms of the GNU General Public License as published by | |
a9762ec7 | 9 | the Free Software Foundation; either version 3 of the License, or |
c0e8c252 AC |
10 | (at your option) any later version. |
11 | ||
12 | This program is distributed in the hope that it will be useful, | |
13 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | GNU General Public License for more details. | |
16 | ||
17 | You should have received a copy of the GNU General Public License | |
a9762ec7 | 18 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
c0e8c252 AC |
19 | |
20 | #include "defs.h" | |
21 | ||
d55e5aa6 | 22 | /* Local non-gdb includes. */ |
fb6ecb0f | 23 | #include "arch-utils.h" |
d55e5aa6 TT |
24 | #include "common/version.h" |
25 | #include "dis-asm.h" | |
26 | #include "floatformat.h" | |
c0e8c252 | 27 | #include "gdbcmd.h" |
d55e5aa6 TT |
28 | #include "gdbcore.h" |
29 | #include "inferior.h" | |
45741a9c | 30 | #include "infrun.h" |
d55e5aa6 TT |
31 | #include "language.h" |
32 | #include "objfiles.h" | |
33 | #include "osabi.h" | |
fbec36e2 | 34 | #include "regcache.h" |
4182591f | 35 | #include "sim-regno.h" |
3e29f34a | 36 | #include "symtab.h" |
d55e5aa6 | 37 | #include "target-descriptions.h" |
1fd35568 | 38 | |
99e40580 UW |
39 | int |
40 | default_displaced_step_hw_singlestep (struct gdbarch *gdbarch, | |
41 | struct displaced_step_closure *closure) | |
42 | { | |
43 | return !gdbarch_software_single_step_p (gdbarch); | |
44 | } | |
237fc4c9 PA |
45 | |
46 | CORE_ADDR | |
47 | displaced_step_at_entry_point (struct gdbarch *gdbarch) | |
48 | { | |
49 | CORE_ADDR addr; | |
50 | int bp_len; | |
51 | ||
52 | addr = entry_point_address (); | |
53 | ||
237fc4c9 PA |
54 | /* Inferior calls also use the entry point as a breakpoint location. |
55 | We don't want displaced stepping to interfere with those | |
56 | breakpoints, so leave space. */ | |
57 | gdbarch_breakpoint_from_pc (gdbarch, &addr, &bp_len); | |
5931a2fa | 58 | addr += bp_len * 2; |
237fc4c9 PA |
59 | |
60 | return addr; | |
61 | } | |
62 | ||
4182591f | 63 | int |
e7faf938 | 64 | legacy_register_sim_regno (struct gdbarch *gdbarch, int regnum) |
4182591f AC |
65 | { |
66 | /* Only makes sense to supply raw registers. */ | |
e7faf938 | 67 | gdb_assert (regnum >= 0 && regnum < gdbarch_num_regs (gdbarch)); |
4182591f AC |
68 | /* NOTE: cagney/2002-05-13: The old code did it this way and it is |
69 | suspected that some GDB/SIM combinations may rely on this | |
70 | behavour. The default should be one2one_register_sim_regno | |
71 | (below). */ | |
e7faf938 MD |
72 | if (gdbarch_register_name (gdbarch, regnum) != NULL |
73 | && gdbarch_register_name (gdbarch, regnum)[0] != '\0') | |
4182591f AC |
74 | return regnum; |
75 | else | |
76 | return LEGACY_SIM_REGNO_IGNORE; | |
77 | } | |
78 | ||
bdcd319a | 79 | CORE_ADDR |
52f729a7 | 80 | generic_skip_trampoline_code (struct frame_info *frame, CORE_ADDR pc) |
bdcd319a CV |
81 | { |
82 | return 0; | |
83 | } | |
84 | ||
dea0c52f | 85 | CORE_ADDR |
4c8c40e6 | 86 | generic_skip_solib_resolver (struct gdbarch *gdbarch, CORE_ADDR pc) |
dea0c52f MK |
87 | { |
88 | return 0; | |
89 | } | |
90 | ||
d50355b6 | 91 | int |
e17a4113 | 92 | generic_in_solib_return_trampoline (struct gdbarch *gdbarch, |
2c02bd72 | 93 | CORE_ADDR pc, const char *name) |
d50355b6 MS |
94 | { |
95 | return 0; | |
96 | } | |
97 | ||
c12260ac | 98 | int |
c9cf6e20 | 99 | generic_stack_frame_destroyed_p (struct gdbarch *gdbarch, CORE_ADDR pc) |
c12260ac CV |
100 | { |
101 | return 0; | |
102 | } | |
103 | ||
7eb89530 YQ |
104 | int |
105 | default_code_of_frame_writable (struct gdbarch *gdbarch, | |
106 | struct frame_info *frame) | |
107 | { | |
108 | return 1; | |
109 | } | |
110 | ||
4d1e7dd1 | 111 | /* Helper functions for gdbarch_inner_than */ |
3339cf8b AC |
112 | |
113 | int | |
fba45db2 | 114 | core_addr_lessthan (CORE_ADDR lhs, CORE_ADDR rhs) |
3339cf8b AC |
115 | { |
116 | return (lhs < rhs); | |
117 | } | |
118 | ||
119 | int | |
fba45db2 | 120 | core_addr_greaterthan (CORE_ADDR lhs, CORE_ADDR rhs) |
3339cf8b AC |
121 | { |
122 | return (lhs > rhs); | |
123 | } | |
124 | ||
0e2de366 | 125 | /* Misc helper functions for targets. */ |
193e3b1a | 126 | |
f517ea4e | 127 | CORE_ADDR |
24568a2c | 128 | core_addr_identity (struct gdbarch *gdbarch, CORE_ADDR addr) |
f517ea4e PS |
129 | { |
130 | return addr; | |
131 | } | |
132 | ||
e2d0e7eb AC |
133 | CORE_ADDR |
134 | convert_from_func_ptr_addr_identity (struct gdbarch *gdbarch, CORE_ADDR addr, | |
135 | struct target_ops *targ) | |
136 | { | |
137 | return addr; | |
138 | } | |
139 | ||
88c72b7d | 140 | int |
d3f73121 | 141 | no_op_reg_to_regnum (struct gdbarch *gdbarch, int reg) |
88c72b7d AC |
142 | { |
143 | return reg; | |
144 | } | |
145 | ||
a2cf933a | 146 | void |
3e29f34a | 147 | default_coff_make_msymbol_special (int val, struct minimal_symbol *msym) |
a2cf933a EZ |
148 | { |
149 | return; | |
150 | } | |
151 | ||
3e29f34a MR |
152 | /* See arch-utils.h. */ |
153 | ||
a2cf933a | 154 | void |
3e29f34a | 155 | default_make_symbol_special (struct symbol *sym, struct objfile *objfile) |
a2cf933a EZ |
156 | { |
157 | return; | |
158 | } | |
159 | ||
3e29f34a MR |
160 | /* See arch-utils.h. */ |
161 | ||
162 | CORE_ADDR | |
163 | default_adjust_dwarf2_addr (CORE_ADDR pc) | |
164 | { | |
165 | return pc; | |
166 | } | |
167 | ||
168 | /* See arch-utils.h. */ | |
169 | ||
170 | CORE_ADDR | |
171 | default_adjust_dwarf2_line (CORE_ADDR addr, int rel) | |
172 | { | |
173 | return addr; | |
174 | } | |
175 | ||
b41c5a85 JW |
176 | /* See arch-utils.h. */ |
177 | ||
178 | bool | |
179 | default_execute_dwarf_cfa_vendor_op (struct gdbarch *gdbarch, gdb_byte op, | |
180 | struct dwarf2_frame_state *fs) | |
181 | { | |
182 | return false; | |
183 | } | |
184 | ||
01fb7433 | 185 | int |
64a3914f | 186 | cannot_register_not (struct gdbarch *gdbarch, int regnum) |
01fb7433 AC |
187 | { |
188 | return 0; | |
189 | } | |
39d4ef09 AC |
190 | |
191 | /* Legacy version of target_virtual_frame_pointer(). Assumes that | |
0e2de366 MS |
192 | there is an gdbarch_deprecated_fp_regnum and that it is the same, |
193 | cooked or raw. */ | |
39d4ef09 AC |
194 | |
195 | void | |
a54fba4c MD |
196 | legacy_virtual_frame_pointer (struct gdbarch *gdbarch, |
197 | CORE_ADDR pc, | |
39d4ef09 AC |
198 | int *frame_regnum, |
199 | LONGEST *frame_offset) | |
200 | { | |
20bcf01c AC |
201 | /* FIXME: cagney/2002-09-13: This code is used when identifying the |
202 | frame pointer of the current PC. It is assuming that a single | |
203 | register and an offset can determine this. I think it should | |
204 | instead generate a byte code expression as that would work better | |
205 | with things like Dwarf2's CFI. */ | |
a54fba4c MD |
206 | if (gdbarch_deprecated_fp_regnum (gdbarch) >= 0 |
207 | && gdbarch_deprecated_fp_regnum (gdbarch) | |
208 | < gdbarch_num_regs (gdbarch)) | |
209 | *frame_regnum = gdbarch_deprecated_fp_regnum (gdbarch); | |
210 | else if (gdbarch_sp_regnum (gdbarch) >= 0 | |
211 | && gdbarch_sp_regnum (gdbarch) | |
212 | < gdbarch_num_regs (gdbarch)) | |
213 | *frame_regnum = gdbarch_sp_regnum (gdbarch); | |
20bcf01c AC |
214 | else |
215 | /* Should this be an internal error? I guess so, it is reflecting | |
216 | an architectural limitation in the current design. */ | |
0e2de366 MS |
217 | internal_error (__FILE__, __LINE__, |
218 | _("No virtual frame pointer available")); | |
39d4ef09 AC |
219 | *frame_offset = 0; |
220 | } | |
46cd78fb | 221 | |
9b790ce7 UW |
222 | /* Return a floating-point format for a floating-point variable of |
223 | length LEN in bits. If non-NULL, NAME is the name of its type. | |
224 | If no suitable type is found, return NULL. */ | |
225 | ||
226 | const struct floatformat ** | |
227 | default_floatformat_for_type (struct gdbarch *gdbarch, | |
228 | const char *name, int len) | |
229 | { | |
230 | const struct floatformat **format = NULL; | |
231 | ||
232 | if (len == gdbarch_half_bit (gdbarch)) | |
233 | format = gdbarch_half_format (gdbarch); | |
234 | else if (len == gdbarch_float_bit (gdbarch)) | |
235 | format = gdbarch_float_format (gdbarch); | |
236 | else if (len == gdbarch_double_bit (gdbarch)) | |
237 | format = gdbarch_double_format (gdbarch); | |
238 | else if (len == gdbarch_long_double_bit (gdbarch)) | |
239 | format = gdbarch_long_double_format (gdbarch); | |
240 | /* On i386 the 'long double' type takes 96 bits, | |
241 | while the real number of used bits is only 80, | |
242 | both in processor and in memory. | |
243 | The code below accepts the real bit size. */ | |
244 | else if (gdbarch_long_double_format (gdbarch) != NULL | |
245 | && len == gdbarch_long_double_format (gdbarch)[0]->totalsize) | |
246 | format = gdbarch_long_double_format (gdbarch); | |
247 | ||
248 | return format; | |
249 | } | |
d7bd68ca | 250 | \f |
13d01224 | 251 | int |
76a8ddb9 UW |
252 | generic_convert_register_p (struct gdbarch *gdbarch, int regnum, |
253 | struct type *type) | |
13d01224 | 254 | { |
9730f241 | 255 | return 0; |
13d01224 AC |
256 | } |
257 | ||
192cb3d4 MK |
258 | int |
259 | default_stabs_argument_has_addr (struct gdbarch *gdbarch, struct type *type) | |
260 | { | |
192cb3d4 MK |
261 | return 0; |
262 | } | |
263 | ||
3ca64954 RC |
264 | int |
265 | generic_instruction_nullified (struct gdbarch *gdbarch, | |
266 | struct regcache *regcache) | |
267 | { | |
268 | return 0; | |
269 | } | |
270 | ||
123dc839 DJ |
271 | int |
272 | default_remote_register_number (struct gdbarch *gdbarch, | |
273 | int regno) | |
274 | { | |
275 | return regno; | |
276 | } | |
277 | ||
3437254d PA |
278 | /* See arch-utils.h. */ |
279 | ||
280 | int | |
281 | default_vsyscall_range (struct gdbarch *gdbarch, struct mem_range *range) | |
282 | { | |
283 | return 0; | |
284 | } | |
285 | ||
01fb7433 | 286 | \f |
b4a20239 AC |
287 | /* Functions to manipulate the endianness of the target. */ |
288 | ||
f486487f | 289 | static enum bfd_endian target_byte_order_user = BFD_ENDIAN_UNKNOWN; |
b4a20239 | 290 | |
53904c9e AC |
291 | static const char endian_big[] = "big"; |
292 | static const char endian_little[] = "little"; | |
293 | static const char endian_auto[] = "auto"; | |
40478521 | 294 | static const char *const endian_enum[] = |
b4a20239 AC |
295 | { |
296 | endian_big, | |
297 | endian_little, | |
298 | endian_auto, | |
299 | NULL, | |
300 | }; | |
53904c9e | 301 | static const char *set_endian_string; |
b4a20239 | 302 | |
b6d373df DJ |
303 | enum bfd_endian |
304 | selected_byte_order (void) | |
305 | { | |
e17c207e | 306 | return target_byte_order_user; |
b6d373df DJ |
307 | } |
308 | ||
b4a20239 AC |
309 | /* Called by ``show endian''. */ |
310 | ||
311 | static void | |
7ab04401 AC |
312 | show_endian (struct ui_file *file, int from_tty, struct cmd_list_element *c, |
313 | const char *value) | |
b4a20239 | 314 | { |
7b6b9e83 | 315 | if (target_byte_order_user == BFD_ENDIAN_UNKNOWN) |
e17c207e | 316 | if (gdbarch_byte_order (get_current_arch ()) == BFD_ENDIAN_BIG) |
7ab04401 AC |
317 | fprintf_unfiltered (file, _("The target endianness is set automatically " |
318 | "(currently big endian)\n")); | |
edefbb7c | 319 | else |
7ab04401 | 320 | fprintf_unfiltered (file, _("The target endianness is set automatically " |
3e43a32a | 321 | "(currently little endian)\n")); |
b4a20239 | 322 | else |
e17c207e | 323 | if (target_byte_order_user == BFD_ENDIAN_BIG) |
7ab04401 AC |
324 | fprintf_unfiltered (file, |
325 | _("The target is assumed to be big endian\n")); | |
326 | else | |
327 | fprintf_unfiltered (file, | |
328 | _("The target is assumed to be little endian\n")); | |
b4a20239 AC |
329 | } |
330 | ||
331 | static void | |
eb4c3f4a | 332 | set_endian (const char *ignore_args, int from_tty, struct cmd_list_element *c) |
b4a20239 | 333 | { |
7a107747 DJ |
334 | struct gdbarch_info info; |
335 | ||
336 | gdbarch_info_init (&info); | |
337 | ||
3fd3d7d2 | 338 | if (set_endian_string == endian_auto) |
b4a20239 | 339 | { |
7a107747 DJ |
340 | target_byte_order_user = BFD_ENDIAN_UNKNOWN; |
341 | if (! gdbarch_update_p (info)) | |
342 | internal_error (__FILE__, __LINE__, | |
343 | _("set_endian: architecture update failed")); | |
b4a20239 AC |
344 | } |
345 | else if (set_endian_string == endian_little) | |
346 | { | |
d90cf509 AC |
347 | info.byte_order = BFD_ENDIAN_LITTLE; |
348 | if (! gdbarch_update_p (info)) | |
edefbb7c | 349 | printf_unfiltered (_("Little endian target not supported by GDB\n")); |
7a107747 DJ |
350 | else |
351 | target_byte_order_user = BFD_ENDIAN_LITTLE; | |
b4a20239 AC |
352 | } |
353 | else if (set_endian_string == endian_big) | |
354 | { | |
d90cf509 AC |
355 | info.byte_order = BFD_ENDIAN_BIG; |
356 | if (! gdbarch_update_p (info)) | |
edefbb7c | 357 | printf_unfiltered (_("Big endian target not supported by GDB\n")); |
7a107747 DJ |
358 | else |
359 | target_byte_order_user = BFD_ENDIAN_BIG; | |
b4a20239 AC |
360 | } |
361 | else | |
8e65ff28 | 362 | internal_error (__FILE__, __LINE__, |
edefbb7c | 363 | _("set_endian: bad value")); |
7a107747 | 364 | |
7ab04401 | 365 | show_endian (gdb_stdout, from_tty, NULL, NULL); |
b4a20239 AC |
366 | } |
367 | ||
23181151 | 368 | /* Given SELECTED, a currently selected BFD architecture, and |
e35359c5 UW |
369 | TARGET_DESC, the current target description, return what |
370 | architecture to use. | |
371 | ||
372 | SELECTED may be NULL, in which case we return the architecture | |
373 | associated with TARGET_DESC. If SELECTED specifies a variant | |
374 | of the architecture associtated with TARGET_DESC, return the | |
375 | more specific of the two. | |
376 | ||
377 | If SELECTED is a different architecture, but it is accepted as | |
378 | compatible by the target, we can use the target architecture. | |
379 | ||
380 | If SELECTED is obviously incompatible, warn the user. */ | |
23181151 DJ |
381 | |
382 | static const struct bfd_arch_info * | |
e35359c5 UW |
383 | choose_architecture_for_target (const struct target_desc *target_desc, |
384 | const struct bfd_arch_info *selected) | |
23181151 | 385 | { |
e35359c5 | 386 | const struct bfd_arch_info *from_target = tdesc_architecture (target_desc); |
23181151 DJ |
387 | const struct bfd_arch_info *compat1, *compat2; |
388 | ||
389 | if (selected == NULL) | |
390 | return from_target; | |
391 | ||
392 | if (from_target == NULL) | |
393 | return selected; | |
394 | ||
395 | /* struct bfd_arch_info objects are singletons: that is, there's | |
396 | supposed to be exactly one instance for a given machine. So you | |
397 | can tell whether two are equivalent by comparing pointers. */ | |
398 | if (from_target == selected) | |
399 | return selected; | |
400 | ||
401 | /* BFD's 'A->compatible (A, B)' functions return zero if A and B are | |
402 | incompatible. But if they are compatible, it returns the 'more | |
403 | featureful' of the two arches. That is, if A can run code | |
404 | written for B, but B can't run code written for A, then it'll | |
405 | return A. | |
406 | ||
407 | Some targets (e.g. MIPS as of 2006-12-04) don't fully | |
408 | implement this, instead always returning NULL or the first | |
409 | argument. We detect that case by checking both directions. */ | |
410 | ||
411 | compat1 = selected->compatible (selected, from_target); | |
412 | compat2 = from_target->compatible (from_target, selected); | |
413 | ||
414 | if (compat1 == NULL && compat2 == NULL) | |
415 | { | |
0e2de366 MS |
416 | /* BFD considers the architectures incompatible. Check our |
417 | target description whether it accepts SELECTED as compatible | |
418 | anyway. */ | |
e35359c5 UW |
419 | if (tdesc_compatible_p (target_desc, selected)) |
420 | return from_target; | |
421 | ||
23181151 DJ |
422 | warning (_("Selected architecture %s is not compatible " |
423 | "with reported target architecture %s"), | |
424 | selected->printable_name, from_target->printable_name); | |
425 | return selected; | |
426 | } | |
427 | ||
428 | if (compat1 == NULL) | |
429 | return compat2; | |
430 | if (compat2 == NULL) | |
431 | return compat1; | |
432 | if (compat1 == compat2) | |
433 | return compat1; | |
434 | ||
0e2de366 MS |
435 | /* If the two didn't match, but one of them was a default |
436 | architecture, assume the more specific one is correct. This | |
437 | handles the case where an executable or target description just | |
438 | says "mips", but the other knows which MIPS variant. */ | |
23181151 DJ |
439 | if (compat1->the_default) |
440 | return compat2; | |
441 | if (compat2->the_default) | |
442 | return compat1; | |
443 | ||
444 | /* We have no idea which one is better. This is a bug, but not | |
445 | a critical problem; warn the user. */ | |
446 | warning (_("Selected architecture %s is ambiguous with " | |
447 | "reported target architecture %s"), | |
448 | selected->printable_name, from_target->printable_name); | |
449 | return selected; | |
450 | } | |
451 | ||
0e2de366 | 452 | /* Functions to manipulate the architecture of the target. */ |
b4a20239 AC |
453 | |
454 | enum set_arch { set_arch_auto, set_arch_manual }; | |
455 | ||
7a107747 | 456 | static const struct bfd_arch_info *target_architecture_user; |
b4a20239 | 457 | |
a8cf2722 AC |
458 | static const char *set_architecture_string; |
459 | ||
460 | const char * | |
461 | selected_architecture_name (void) | |
462 | { | |
7a107747 | 463 | if (target_architecture_user == NULL) |
a8cf2722 AC |
464 | return NULL; |
465 | else | |
466 | return set_architecture_string; | |
467 | } | |
b4a20239 | 468 | |
b4a20239 | 469 | /* Called if the user enters ``show architecture'' without an |
0e2de366 | 470 | argument. */ |
b4a20239 AC |
471 | |
472 | static void | |
7ab04401 AC |
473 | show_architecture (struct ui_file *file, int from_tty, |
474 | struct cmd_list_element *c, const char *value) | |
b4a20239 | 475 | { |
7a107747 | 476 | if (target_architecture_user == NULL) |
3e43a32a MS |
477 | fprintf_filtered (file, _("The target architecture is set " |
478 | "automatically (currently %s)\n"), | |
479 | gdbarch_bfd_arch_info (get_current_arch ())->printable_name); | |
b4a20239 | 480 | else |
3e43a32a MS |
481 | fprintf_filtered (file, _("The target architecture is assumed to be %s\n"), |
482 | set_architecture_string); | |
b4a20239 AC |
483 | } |
484 | ||
485 | ||
486 | /* Called if the user enters ``set architecture'' with or without an | |
0e2de366 | 487 | argument. */ |
b4a20239 AC |
488 | |
489 | static void | |
eb4c3f4a TT |
490 | set_architecture (const char *ignore_args, |
491 | int from_tty, struct cmd_list_element *c) | |
b4a20239 | 492 | { |
7a107747 DJ |
493 | struct gdbarch_info info; |
494 | ||
495 | gdbarch_info_init (&info); | |
496 | ||
b4a20239 AC |
497 | if (strcmp (set_architecture_string, "auto") == 0) |
498 | { | |
7a107747 DJ |
499 | target_architecture_user = NULL; |
500 | if (!gdbarch_update_p (info)) | |
501 | internal_error (__FILE__, __LINE__, | |
502 | _("could not select an architecture automatically")); | |
b4a20239 | 503 | } |
d90cf509 | 504 | else |
b4a20239 | 505 | { |
b4a20239 AC |
506 | info.bfd_arch_info = bfd_scan_arch (set_architecture_string); |
507 | if (info.bfd_arch_info == NULL) | |
8e65ff28 | 508 | internal_error (__FILE__, __LINE__, |
edefbb7c | 509 | _("set_architecture: bfd_scan_arch failed")); |
16f33e29 | 510 | if (gdbarch_update_p (info)) |
7a107747 | 511 | target_architecture_user = info.bfd_arch_info; |
b4a20239 | 512 | else |
edefbb7c | 513 | printf_unfiltered (_("Architecture `%s' not recognized.\n"), |
b4a20239 AC |
514 | set_architecture_string); |
515 | } | |
7ab04401 | 516 | show_architecture (gdb_stdout, from_tty, NULL, NULL); |
b4a20239 AC |
517 | } |
518 | ||
ebdba546 | 519 | /* Try to select a global architecture that matches "info". Return |
0f9741f2 | 520 | non-zero if the attempt succeeds. */ |
ebdba546 AC |
521 | int |
522 | gdbarch_update_p (struct gdbarch_info info) | |
523 | { | |
a7f1256d UW |
524 | struct gdbarch *new_gdbarch; |
525 | ||
526 | /* Check for the current file. */ | |
527 | if (info.abfd == NULL) | |
528 | info.abfd = exec_bfd; | |
529 | if (info.abfd == NULL) | |
530 | info.abfd = core_bfd; | |
531 | ||
532 | /* Check for the current target description. */ | |
533 | if (info.target_desc == NULL) | |
534 | info.target_desc = target_current_description (); | |
535 | ||
536 | new_gdbarch = gdbarch_find_by_info (info); | |
ebdba546 AC |
537 | |
538 | /* If there no architecture by that name, reject the request. */ | |
539 | if (new_gdbarch == NULL) | |
540 | { | |
541 | if (gdbarch_debug) | |
542 | fprintf_unfiltered (gdb_stdlog, "gdbarch_update_p: " | |
543 | "Architecture not found\n"); | |
544 | return 0; | |
545 | } | |
546 | ||
547 | /* If it is the same old architecture, accept the request (but don't | |
548 | swap anything). */ | |
f5656ead | 549 | if (new_gdbarch == target_gdbarch ()) |
ebdba546 AC |
550 | { |
551 | if (gdbarch_debug) | |
552 | fprintf_unfiltered (gdb_stdlog, "gdbarch_update_p: " | |
e3cb3832 JB |
553 | "Architecture %s (%s) unchanged\n", |
554 | host_address_to_string (new_gdbarch), | |
ebdba546 AC |
555 | gdbarch_bfd_arch_info (new_gdbarch)->printable_name); |
556 | return 1; | |
557 | } | |
558 | ||
559 | /* It's a new architecture, swap it in. */ | |
560 | if (gdbarch_debug) | |
561 | fprintf_unfiltered (gdb_stdlog, "gdbarch_update_p: " | |
e3cb3832 JB |
562 | "New architecture %s (%s) selected\n", |
563 | host_address_to_string (new_gdbarch), | |
ebdba546 | 564 | gdbarch_bfd_arch_info (new_gdbarch)->printable_name); |
aff68abb | 565 | set_target_gdbarch (new_gdbarch); |
ebdba546 AC |
566 | |
567 | return 1; | |
568 | } | |
569 | ||
2b026650 MK |
570 | /* Return the architecture for ABFD. If no suitable architecture |
571 | could be find, return NULL. */ | |
572 | ||
573 | struct gdbarch * | |
574 | gdbarch_from_bfd (bfd *abfd) | |
b4a20239 | 575 | { |
d90cf509 AC |
576 | struct gdbarch_info info; |
577 | gdbarch_info_init (&info); | |
05c547f6 | 578 | |
d90cf509 | 579 | info.abfd = abfd; |
b60eb90d | 580 | return gdbarch_find_by_info (info); |
2b026650 MK |
581 | } |
582 | ||
583 | /* Set the dynamic target-system-dependent parameters (architecture, | |
584 | byte-order) using information found in the BFD */ | |
585 | ||
586 | void | |
587 | set_gdbarch_from_file (bfd *abfd) | |
588 | { | |
a7f1256d | 589 | struct gdbarch_info info; |
2b026650 MK |
590 | struct gdbarch *gdbarch; |
591 | ||
a7f1256d UW |
592 | gdbarch_info_init (&info); |
593 | info.abfd = abfd; | |
594 | info.target_desc = target_current_description (); | |
595 | gdbarch = gdbarch_find_by_info (info); | |
596 | ||
2b026650 | 597 | if (gdbarch == NULL) |
8a3fe4f8 | 598 | error (_("Architecture of file not recognized.")); |
aff68abb | 599 | set_target_gdbarch (gdbarch); |
b4a20239 AC |
600 | } |
601 | ||
602 | /* Initialize the current architecture. Update the ``set | |
603 | architecture'' command so that it specifies a list of valid | |
604 | architectures. */ | |
605 | ||
1ba607ad AC |
606 | #ifdef DEFAULT_BFD_ARCH |
607 | extern const bfd_arch_info_type DEFAULT_BFD_ARCH; | |
608 | static const bfd_arch_info_type *default_bfd_arch = &DEFAULT_BFD_ARCH; | |
609 | #else | |
4b9b3959 | 610 | static const bfd_arch_info_type *default_bfd_arch; |
1ba607ad AC |
611 | #endif |
612 | ||
613 | #ifdef DEFAULT_BFD_VEC | |
614 | extern const bfd_target DEFAULT_BFD_VEC; | |
615 | static const bfd_target *default_bfd_vec = &DEFAULT_BFD_VEC; | |
616 | #else | |
617 | static const bfd_target *default_bfd_vec; | |
618 | #endif | |
619 | ||
f486487f | 620 | static enum bfd_endian default_byte_order = BFD_ENDIAN_UNKNOWN; |
7a107747 | 621 | |
b4a20239 AC |
622 | void |
623 | initialize_current_architecture (void) | |
624 | { | |
625 | const char **arches = gdbarch_printable_names (); | |
05c547f6 | 626 | struct gdbarch_info info; |
b4a20239 | 627 | |
0e2de366 | 628 | /* determine a default architecture and byte order. */ |
fb6ecb0f | 629 | gdbarch_info_init (&info); |
1ba607ad | 630 | |
0e2de366 | 631 | /* Find a default architecture. */ |
7a107747 | 632 | if (default_bfd_arch == NULL) |
b4a20239 | 633 | { |
1ba607ad | 634 | /* Choose the architecture by taking the first one |
0e2de366 | 635 | alphabetically. */ |
1ba607ad | 636 | const char *chosen = arches[0]; |
b4a20239 | 637 | const char **arch; |
b4a20239 AC |
638 | for (arch = arches; *arch != NULL; arch++) |
639 | { | |
b4a20239 AC |
640 | if (strcmp (*arch, chosen) < 0) |
641 | chosen = *arch; | |
642 | } | |
643 | if (chosen == NULL) | |
8e65ff28 | 644 | internal_error (__FILE__, __LINE__, |
edefbb7c | 645 | _("initialize_current_architecture: No arch")); |
7a107747 DJ |
646 | default_bfd_arch = bfd_scan_arch (chosen); |
647 | if (default_bfd_arch == NULL) | |
8e65ff28 | 648 | internal_error (__FILE__, __LINE__, |
edefbb7c | 649 | _("initialize_current_architecture: Arch not found")); |
1ba607ad AC |
650 | } |
651 | ||
7a107747 DJ |
652 | info.bfd_arch_info = default_bfd_arch; |
653 | ||
afe64c1a | 654 | /* Take several guesses at a byte order. */ |
7a107747 | 655 | if (default_byte_order == BFD_ENDIAN_UNKNOWN |
1ba607ad AC |
656 | && default_bfd_vec != NULL) |
657 | { | |
0e2de366 | 658 | /* Extract BFD's default vector's byte order. */ |
1ba607ad AC |
659 | switch (default_bfd_vec->byteorder) |
660 | { | |
661 | case BFD_ENDIAN_BIG: | |
7a107747 | 662 | default_byte_order = BFD_ENDIAN_BIG; |
1ba607ad AC |
663 | break; |
664 | case BFD_ENDIAN_LITTLE: | |
7a107747 | 665 | default_byte_order = BFD_ENDIAN_LITTLE; |
1ba607ad AC |
666 | break; |
667 | default: | |
668 | break; | |
669 | } | |
670 | } | |
7a107747 | 671 | if (default_byte_order == BFD_ENDIAN_UNKNOWN) |
1ba607ad | 672 | { |
0e2de366 | 673 | /* look for ``*el-*'' in the target name. */ |
1ba607ad AC |
674 | const char *chp; |
675 | chp = strchr (target_name, '-'); | |
676 | if (chp != NULL | |
677 | && chp - 2 >= target_name | |
61012eef | 678 | && startswith (chp - 2, "el")) |
7a107747 | 679 | default_byte_order = BFD_ENDIAN_LITTLE; |
1ba607ad | 680 | } |
7a107747 | 681 | if (default_byte_order == BFD_ENDIAN_UNKNOWN) |
1ba607ad AC |
682 | { |
683 | /* Wire it to big-endian!!! */ | |
7a107747 | 684 | default_byte_order = BFD_ENDIAN_BIG; |
1ba607ad AC |
685 | } |
686 | ||
7a107747 | 687 | info.byte_order = default_byte_order; |
9d4fde75 | 688 | info.byte_order_for_code = info.byte_order; |
7a107747 | 689 | |
d90cf509 AC |
690 | if (! gdbarch_update_p (info)) |
691 | internal_error (__FILE__, __LINE__, | |
edefbb7c AC |
692 | _("initialize_current_architecture: Selection of " |
693 | "initial architecture failed")); | |
b4a20239 | 694 | |
1ba607ad | 695 | /* Create the ``set architecture'' command appending ``auto'' to the |
0e2de366 | 696 | list of architectures. */ |
b4a20239 | 697 | { |
0e2de366 | 698 | /* Append ``auto''. */ |
b4a20239 AC |
699 | int nr; |
700 | for (nr = 0; arches[nr] != NULL; nr++); | |
224c3ddb | 701 | arches = XRESIZEVEC (const char *, arches, nr + 2); |
b4a20239 AC |
702 | arches[nr + 0] = "auto"; |
703 | arches[nr + 1] = NULL; | |
7ab04401 | 704 | add_setshow_enum_cmd ("architecture", class_support, |
3e43a32a MS |
705 | arches, &set_architecture_string, |
706 | _("Set architecture of target."), | |
707 | _("Show architecture of target."), NULL, | |
7ab04401 AC |
708 | set_architecture, show_architecture, |
709 | &setlist, &showlist); | |
b4a20239 | 710 | add_alias_cmd ("processor", "architecture", class_support, 1, &setlist); |
b4a20239 AC |
711 | } |
712 | } | |
713 | ||
714 | ||
fb6ecb0f AC |
715 | /* Initialize a gdbarch info to values that will be automatically |
716 | overridden. Note: Originally, this ``struct info'' was initialized | |
ce2826aa | 717 | using memset(0). Unfortunately, that ran into problems, namely |
fb6ecb0f AC |
718 | BFD_ENDIAN_BIG is zero. An explicit initialization function that |
719 | can explicitly set each field to a well defined value is used. */ | |
720 | ||
721 | void | |
722 | gdbarch_info_init (struct gdbarch_info *info) | |
723 | { | |
724 | memset (info, 0, sizeof (struct gdbarch_info)); | |
428721aa | 725 | info->byte_order = BFD_ENDIAN_UNKNOWN; |
9d4fde75 | 726 | info->byte_order_for_code = info->byte_order; |
fb6ecb0f AC |
727 | } |
728 | ||
100bcc3f | 729 | /* Similar to init, but this time fill in the blanks. Information is |
7a107747 DJ |
730 | obtained from the global "set ..." options and explicitly |
731 | initialized INFO fields. */ | |
bf922ad9 AC |
732 | |
733 | void | |
7a107747 | 734 | gdbarch_info_fill (struct gdbarch_info *info) |
bf922ad9 AC |
735 | { |
736 | /* "(gdb) set architecture ...". */ | |
737 | if (info->bfd_arch_info == NULL | |
7a107747 DJ |
738 | && target_architecture_user) |
739 | info->bfd_arch_info = target_architecture_user; | |
424163ea | 740 | /* From the file. */ |
bf922ad9 AC |
741 | if (info->bfd_arch_info == NULL |
742 | && info->abfd != NULL | |
743 | && bfd_get_arch (info->abfd) != bfd_arch_unknown | |
744 | && bfd_get_arch (info->abfd) != bfd_arch_obscure) | |
745 | info->bfd_arch_info = bfd_get_arch_info (info->abfd); | |
23181151 DJ |
746 | /* From the target. */ |
747 | if (info->target_desc != NULL) | |
748 | info->bfd_arch_info = choose_architecture_for_target | |
e35359c5 | 749 | (info->target_desc, info->bfd_arch_info); |
7a107747 DJ |
750 | /* From the default. */ |
751 | if (info->bfd_arch_info == NULL) | |
752 | info->bfd_arch_info = default_bfd_arch; | |
bf922ad9 AC |
753 | |
754 | /* "(gdb) set byte-order ...". */ | |
755 | if (info->byte_order == BFD_ENDIAN_UNKNOWN | |
7a107747 DJ |
756 | && target_byte_order_user != BFD_ENDIAN_UNKNOWN) |
757 | info->byte_order = target_byte_order_user; | |
bf922ad9 AC |
758 | /* From the INFO struct. */ |
759 | if (info->byte_order == BFD_ENDIAN_UNKNOWN | |
760 | && info->abfd != NULL) | |
761 | info->byte_order = (bfd_big_endian (info->abfd) ? BFD_ENDIAN_BIG | |
7a107747 DJ |
762 | : bfd_little_endian (info->abfd) ? BFD_ENDIAN_LITTLE |
763 | : BFD_ENDIAN_UNKNOWN); | |
764 | /* From the default. */ | |
765 | if (info->byte_order == BFD_ENDIAN_UNKNOWN) | |
766 | info->byte_order = default_byte_order; | |
9d4fde75 | 767 | info->byte_order_for_code = info->byte_order; |
4b2dfa9d MR |
768 | /* Wire the default to the last selected byte order. */ |
769 | default_byte_order = info->byte_order; | |
bf922ad9 AC |
770 | |
771 | /* "(gdb) set osabi ...". Handled by gdbarch_lookup_osabi. */ | |
08d16641 | 772 | /* From the manual override, or from file. */ |
26540402 | 773 | if (info->osabi == GDB_OSABI_UNKNOWN) |
bf922ad9 | 774 | info->osabi = gdbarch_lookup_osabi (info->abfd); |
08d16641 | 775 | /* From the target. */ |
26540402 | 776 | |
08d16641 PA |
777 | if (info->osabi == GDB_OSABI_UNKNOWN && info->target_desc != NULL) |
778 | info->osabi = tdesc_osabi (info->target_desc); | |
779 | /* From the configured default. */ | |
f4290e2a | 780 | #ifdef GDB_OSABI_DEFAULT |
08d16641 PA |
781 | if (info->osabi == GDB_OSABI_UNKNOWN) |
782 | info->osabi = GDB_OSABI_DEFAULT; | |
f4290e2a | 783 | #endif |
26540402 SM |
784 | /* If we still don't know which osabi to pick, pick none. */ |
785 | if (info->osabi == GDB_OSABI_UNKNOWN) | |
786 | info->osabi = GDB_OSABI_NONE; | |
bf922ad9 AC |
787 | |
788 | /* Must have at least filled in the architecture. */ | |
789 | gdb_assert (info->bfd_arch_info != NULL); | |
790 | } | |
791 | ||
0e2de366 MS |
792 | /* Return "current" architecture. If the target is running, this is |
793 | the architecture of the selected frame. Otherwise, the "current" | |
794 | architecture defaults to the target architecture. | |
e17c207e | 795 | |
0e2de366 MS |
796 | This function should normally be called solely by the command |
797 | interpreter routines to determine the architecture to execute a | |
798 | command in. */ | |
e17c207e UW |
799 | struct gdbarch * |
800 | get_current_arch (void) | |
801 | { | |
802 | if (has_stack_frames ()) | |
803 | return get_frame_arch (get_selected_frame (NULL)); | |
804 | else | |
f5656ead | 805 | return target_gdbarch (); |
e17c207e UW |
806 | } |
807 | ||
6c95b8df PA |
808 | int |
809 | default_has_shared_address_space (struct gdbarch *gdbarch) | |
810 | { | |
811 | /* Simply say no. In most unix-like targets each inferior/process | |
812 | has its own address space. */ | |
813 | return 0; | |
814 | } | |
815 | ||
7a697b8d | 816 | int |
6b940e6a | 817 | default_fast_tracepoint_valid_at (struct gdbarch *gdbarch, CORE_ADDR addr, |
281d762b | 818 | std::string *msg) |
7a697b8d SS |
819 | { |
820 | /* We don't know if maybe the target has some way to do fast | |
821 | tracepoints that doesn't need gdbarch, so always say yes. */ | |
822 | if (msg) | |
281d762b | 823 | msg->clear (); |
7a697b8d SS |
824 | return 1; |
825 | } | |
826 | ||
22f13eb8 YQ |
827 | const gdb_byte * |
828 | default_breakpoint_from_pc (struct gdbarch *gdbarch, CORE_ADDR *pcptr, | |
829 | int *lenptr) | |
830 | { | |
831 | int kind = gdbarch_breakpoint_kind_from_pc (gdbarch, pcptr); | |
832 | ||
833 | return gdbarch_sw_breakpoint_from_kind (gdbarch, kind, lenptr); | |
834 | } | |
833b7ab5 YQ |
835 | int |
836 | default_breakpoint_kind_from_current_state (struct gdbarch *gdbarch, | |
837 | struct regcache *regcache, | |
838 | CORE_ADDR *pcptr) | |
839 | { | |
840 | return gdbarch_breakpoint_kind_from_pc (gdbarch, pcptr); | |
841 | } | |
842 | ||
22f13eb8 | 843 | |
6710bf39 SS |
844 | void |
845 | default_gen_return_address (struct gdbarch *gdbarch, | |
846 | struct agent_expr *ax, struct axs_value *value, | |
847 | CORE_ADDR scope) | |
848 | { | |
849 | error (_("This architecture has no method to collect a return address.")); | |
850 | } | |
851 | ||
18648a37 YQ |
852 | int |
853 | default_return_in_first_hidden_param_p (struct gdbarch *gdbarch, | |
854 | struct type *type) | |
855 | { | |
856 | /* Usually, the return value's address is stored the in the "first hidden" | |
857 | parameter if the return value should be passed by reference, as | |
858 | specified in ABI. */ | |
859 | return language_pass_by_reference (type); | |
860 | } | |
861 | ||
c2170eef MM |
862 | int default_insn_is_call (struct gdbarch *gdbarch, CORE_ADDR addr) |
863 | { | |
864 | return 0; | |
865 | } | |
866 | ||
867 | int default_insn_is_ret (struct gdbarch *gdbarch, CORE_ADDR addr) | |
868 | { | |
869 | return 0; | |
870 | } | |
871 | ||
872 | int default_insn_is_jump (struct gdbarch *gdbarch, CORE_ADDR addr) | |
873 | { | |
874 | return 0; | |
875 | } | |
876 | ||
ae9bb220 PA |
877 | void |
878 | default_skip_permanent_breakpoint (struct regcache *regcache) | |
879 | { | |
ac7936df | 880 | struct gdbarch *gdbarch = regcache->arch (); |
ae9bb220 | 881 | CORE_ADDR current_pc = regcache_read_pc (regcache); |
ae9bb220 PA |
882 | int bp_len; |
883 | ||
ac298888 | 884 | gdbarch_breakpoint_from_pc (gdbarch, ¤t_pc, &bp_len); |
ae9bb220 PA |
885 | current_pc += bp_len; |
886 | regcache_write_pc (regcache, current_pc); | |
887 | } | |
c0e8c252 | 888 | |
f208eee0 JK |
889 | CORE_ADDR |
890 | default_infcall_mmap (CORE_ADDR size, unsigned prot) | |
891 | { | |
892 | error (_("This target does not support inferior memory allocation by mmap.")); | |
893 | } | |
894 | ||
7f361056 JK |
895 | void |
896 | default_infcall_munmap (CORE_ADDR addr, CORE_ADDR size) | |
897 | { | |
898 | /* Memory reserved by inferior mmap is kept leaked. */ | |
899 | } | |
900 | ||
f208eee0 JK |
901 | /* -mcmodel=large is used so that no GOT (Global Offset Table) is needed to be |
902 | created in inferior memory by GDB (normally it is set by ld.so). */ | |
903 | ||
904 | char * | |
905 | default_gcc_target_options (struct gdbarch *gdbarch) | |
906 | { | |
907 | return xstrprintf ("-m%d%s", gdbarch_ptr_bit (gdbarch), | |
908 | gdbarch_ptr_bit (gdbarch) == 64 ? " -mcmodel=large" : ""); | |
909 | } | |
910 | ||
ac04f72b TT |
911 | /* gdbarch gnu_triplet_regexp method. */ |
912 | ||
913 | const char * | |
914 | default_gnu_triplet_regexp (struct gdbarch *gdbarch) | |
915 | { | |
916 | return gdbarch_bfd_arch_info (gdbarch)->arch_name; | |
917 | } | |
918 | ||
3374165f SM |
919 | /* Default method for gdbarch_addressable_memory_unit_size. By default, a memory byte has |
920 | a size of 1 octet. */ | |
921 | ||
922 | int | |
923 | default_addressable_memory_unit_size (struct gdbarch *gdbarch) | |
924 | { | |
925 | return 1; | |
926 | } | |
927 | ||
5f034a78 MK |
928 | void |
929 | default_guess_tracepoint_registers (struct gdbarch *gdbarch, | |
930 | struct regcache *regcache, | |
931 | CORE_ADDR addr) | |
932 | { | |
933 | int pc_regno = gdbarch_pc_regnum (gdbarch); | |
934 | gdb_byte *regs; | |
935 | ||
936 | /* This guessing code below only works if the PC register isn't | |
937 | a pseudo-register. The value of a pseudo-register isn't stored | |
938 | in the (non-readonly) regcache -- instead it's recomputed | |
939 | (probably from some other cached raw register) whenever the | |
940 | register is read. In this case, a custom method implementation | |
941 | should be used by the architecture. */ | |
942 | if (pc_regno < 0 || pc_regno >= gdbarch_num_regs (gdbarch)) | |
943 | return; | |
944 | ||
945 | regs = (gdb_byte *) alloca (register_size (gdbarch, pc_regno)); | |
946 | store_unsigned_integer (regs, register_size (gdbarch, pc_regno), | |
947 | gdbarch_byte_order (gdbarch), addr); | |
73e1c03f | 948 | regcache->raw_supply (pc_regno, regs); |
5f034a78 MK |
949 | } |
950 | ||
39503f82 YQ |
951 | int |
952 | default_print_insn (bfd_vma memaddr, disassemble_info *info) | |
953 | { | |
954 | disassembler_ftype disassemble_fn; | |
955 | ||
39503f82 YQ |
956 | disassemble_fn = disassembler (info->arch, info->endian == BFD_ENDIAN_BIG, |
957 | info->mach, exec_bfd); | |
958 | ||
959 | gdb_assert (disassemble_fn != NULL); | |
960 | return (*disassemble_fn) (memaddr, info); | |
961 | } | |
962 | ||
46a62268 YQ |
963 | /* See arch-utils.h. */ |
964 | ||
965 | CORE_ADDR | |
966 | gdbarch_skip_prologue_noexcept (gdbarch *gdbarch, CORE_ADDR pc) noexcept | |
967 | { | |
968 | CORE_ADDR new_pc = pc; | |
969 | ||
970 | TRY | |
971 | { | |
972 | new_pc = gdbarch_skip_prologue (gdbarch, pc); | |
973 | } | |
974 | CATCH (ex, RETURN_MASK_ALL) | |
975 | {} | |
976 | END_CATCH | |
977 | ||
978 | return new_pc; | |
979 | } | |
980 | ||
1d509aa6 MM |
981 | /* See arch-utils.h. */ |
982 | ||
983 | bool | |
984 | default_in_indirect_branch_thunk (gdbarch *gdbarch, CORE_ADDR pc) | |
985 | { | |
986 | return false; | |
987 | } | |
988 | ||
2b4424c3 TT |
989 | /* See arch-utils.h. */ |
990 | ||
991 | ULONGEST | |
992 | default_type_align (struct gdbarch *gdbarch, struct type *type) | |
993 | { | |
5561fc30 | 994 | return 0; |
2b4424c3 TT |
995 | } |
996 | ||
c0e8c252 | 997 | void |
b4a20239 | 998 | _initialize_gdbarch_utils (void) |
c0e8c252 | 999 | { |
7ab04401 | 1000 | add_setshow_enum_cmd ("endian", class_support, |
3e43a32a MS |
1001 | endian_enum, &set_endian_string, |
1002 | _("Set endianness of target."), | |
1003 | _("Show endianness of target."), | |
1004 | NULL, set_endian, show_endian, | |
7ab04401 | 1005 | &setlist, &showlist); |
c0e8c252 | 1006 | } |