Commit | Line | Data |
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c0e8c252 | 1 | /* Dynamic architecture support for GDB, the GNU debugger. |
f4f9705a | 2 | |
e2882c85 | 3 | Copyright (C) 1998-2018 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 | ||
fb6ecb0f | 22 | #include "arch-utils.h" |
192cb3d4 | 23 | #include "buildsym.h" |
c0e8c252 | 24 | #include "gdbcmd.h" |
0e2de366 | 25 | #include "inferior.h" /* enum CALL_DUMMY_LOCATION et al. */ |
45741a9c | 26 | #include "infrun.h" |
fbec36e2 | 27 | #include "regcache.h" |
4182591f | 28 | #include "sim-regno.h" |
750eb019 | 29 | #include "gdbcore.h" |
bf922ad9 | 30 | #include "osabi.h" |
424163ea | 31 | #include "target-descriptions.h" |
237fc4c9 | 32 | #include "objfiles.h" |
18648a37 | 33 | #include "language.h" |
3e29f34a | 34 | #include "symtab.h" |
bf922ad9 | 35 | |
1ba607ad AC |
36 | #include "version.h" |
37 | ||
f0d4cc9e AC |
38 | #include "floatformat.h" |
39 | ||
39503f82 | 40 | #include "dis-asm.h" |
1fd35568 | 41 | |
99e40580 UW |
42 | int |
43 | default_displaced_step_hw_singlestep (struct gdbarch *gdbarch, | |
44 | struct displaced_step_closure *closure) | |
45 | { | |
46 | return !gdbarch_software_single_step_p (gdbarch); | |
47 | } | |
237fc4c9 PA |
48 | |
49 | CORE_ADDR | |
50 | displaced_step_at_entry_point (struct gdbarch *gdbarch) | |
51 | { | |
52 | CORE_ADDR addr; | |
53 | int bp_len; | |
54 | ||
55 | addr = entry_point_address (); | |
56 | ||
237fc4c9 PA |
57 | /* Inferior calls also use the entry point as a breakpoint location. |
58 | We don't want displaced stepping to interfere with those | |
59 | breakpoints, so leave space. */ | |
60 | gdbarch_breakpoint_from_pc (gdbarch, &addr, &bp_len); | |
5931a2fa | 61 | addr += bp_len * 2; |
237fc4c9 PA |
62 | |
63 | return addr; | |
64 | } | |
65 | ||
4182591f | 66 | int |
e7faf938 | 67 | legacy_register_sim_regno (struct gdbarch *gdbarch, int regnum) |
4182591f AC |
68 | { |
69 | /* Only makes sense to supply raw registers. */ | |
e7faf938 | 70 | gdb_assert (regnum >= 0 && regnum < gdbarch_num_regs (gdbarch)); |
4182591f AC |
71 | /* NOTE: cagney/2002-05-13: The old code did it this way and it is |
72 | suspected that some GDB/SIM combinations may rely on this | |
73 | behavour. The default should be one2one_register_sim_regno | |
74 | (below). */ | |
e7faf938 MD |
75 | if (gdbarch_register_name (gdbarch, regnum) != NULL |
76 | && gdbarch_register_name (gdbarch, regnum)[0] != '\0') | |
4182591f AC |
77 | return regnum; |
78 | else | |
79 | return LEGACY_SIM_REGNO_IGNORE; | |
80 | } | |
81 | ||
bdcd319a | 82 | CORE_ADDR |
52f729a7 | 83 | generic_skip_trampoline_code (struct frame_info *frame, CORE_ADDR pc) |
bdcd319a CV |
84 | { |
85 | return 0; | |
86 | } | |
87 | ||
dea0c52f | 88 | CORE_ADDR |
4c8c40e6 | 89 | generic_skip_solib_resolver (struct gdbarch *gdbarch, CORE_ADDR pc) |
dea0c52f MK |
90 | { |
91 | return 0; | |
92 | } | |
93 | ||
d50355b6 | 94 | int |
e17a4113 | 95 | generic_in_solib_return_trampoline (struct gdbarch *gdbarch, |
2c02bd72 | 96 | CORE_ADDR pc, const char *name) |
d50355b6 MS |
97 | { |
98 | return 0; | |
99 | } | |
100 | ||
c12260ac | 101 | int |
c9cf6e20 | 102 | generic_stack_frame_destroyed_p (struct gdbarch *gdbarch, CORE_ADDR pc) |
c12260ac CV |
103 | { |
104 | return 0; | |
105 | } | |
106 | ||
7eb89530 YQ |
107 | int |
108 | default_code_of_frame_writable (struct gdbarch *gdbarch, | |
109 | struct frame_info *frame) | |
110 | { | |
111 | return 1; | |
112 | } | |
113 | ||
4d1e7dd1 | 114 | /* Helper functions for gdbarch_inner_than */ |
3339cf8b AC |
115 | |
116 | int | |
fba45db2 | 117 | core_addr_lessthan (CORE_ADDR lhs, CORE_ADDR rhs) |
3339cf8b AC |
118 | { |
119 | return (lhs < rhs); | |
120 | } | |
121 | ||
122 | int | |
fba45db2 | 123 | core_addr_greaterthan (CORE_ADDR lhs, CORE_ADDR rhs) |
3339cf8b AC |
124 | { |
125 | return (lhs > rhs); | |
126 | } | |
127 | ||
0e2de366 | 128 | /* Misc helper functions for targets. */ |
193e3b1a | 129 | |
f517ea4e | 130 | CORE_ADDR |
24568a2c | 131 | core_addr_identity (struct gdbarch *gdbarch, CORE_ADDR addr) |
f517ea4e PS |
132 | { |
133 | return addr; | |
134 | } | |
135 | ||
e2d0e7eb AC |
136 | CORE_ADDR |
137 | convert_from_func_ptr_addr_identity (struct gdbarch *gdbarch, CORE_ADDR addr, | |
138 | struct target_ops *targ) | |
139 | { | |
140 | return addr; | |
141 | } | |
142 | ||
88c72b7d | 143 | int |
d3f73121 | 144 | no_op_reg_to_regnum (struct gdbarch *gdbarch, int reg) |
88c72b7d AC |
145 | { |
146 | return reg; | |
147 | } | |
148 | ||
a2cf933a | 149 | void |
3e29f34a | 150 | default_coff_make_msymbol_special (int val, struct minimal_symbol *msym) |
a2cf933a EZ |
151 | { |
152 | return; | |
153 | } | |
154 | ||
3e29f34a MR |
155 | /* See arch-utils.h. */ |
156 | ||
a2cf933a | 157 | void |
3e29f34a | 158 | default_make_symbol_special (struct symbol *sym, struct objfile *objfile) |
a2cf933a EZ |
159 | { |
160 | return; | |
161 | } | |
162 | ||
3e29f34a MR |
163 | /* See arch-utils.h. */ |
164 | ||
165 | CORE_ADDR | |
166 | default_adjust_dwarf2_addr (CORE_ADDR pc) | |
167 | { | |
168 | return pc; | |
169 | } | |
170 | ||
171 | /* See arch-utils.h. */ | |
172 | ||
173 | CORE_ADDR | |
174 | default_adjust_dwarf2_line (CORE_ADDR addr, int rel) | |
175 | { | |
176 | return addr; | |
177 | } | |
178 | ||
b41c5a85 JW |
179 | /* See arch-utils.h. */ |
180 | ||
181 | bool | |
182 | default_execute_dwarf_cfa_vendor_op (struct gdbarch *gdbarch, gdb_byte op, | |
183 | struct dwarf2_frame_state *fs) | |
184 | { | |
185 | return false; | |
186 | } | |
187 | ||
01fb7433 | 188 | int |
64a3914f | 189 | cannot_register_not (struct gdbarch *gdbarch, int regnum) |
01fb7433 AC |
190 | { |
191 | return 0; | |
192 | } | |
39d4ef09 AC |
193 | |
194 | /* Legacy version of target_virtual_frame_pointer(). Assumes that | |
0e2de366 MS |
195 | there is an gdbarch_deprecated_fp_regnum and that it is the same, |
196 | cooked or raw. */ | |
39d4ef09 AC |
197 | |
198 | void | |
a54fba4c MD |
199 | legacy_virtual_frame_pointer (struct gdbarch *gdbarch, |
200 | CORE_ADDR pc, | |
39d4ef09 AC |
201 | int *frame_regnum, |
202 | LONGEST *frame_offset) | |
203 | { | |
20bcf01c AC |
204 | /* FIXME: cagney/2002-09-13: This code is used when identifying the |
205 | frame pointer of the current PC. It is assuming that a single | |
206 | register and an offset can determine this. I think it should | |
207 | instead generate a byte code expression as that would work better | |
208 | with things like Dwarf2's CFI. */ | |
a54fba4c MD |
209 | if (gdbarch_deprecated_fp_regnum (gdbarch) >= 0 |
210 | && gdbarch_deprecated_fp_regnum (gdbarch) | |
211 | < gdbarch_num_regs (gdbarch)) | |
212 | *frame_regnum = gdbarch_deprecated_fp_regnum (gdbarch); | |
213 | else if (gdbarch_sp_regnum (gdbarch) >= 0 | |
214 | && gdbarch_sp_regnum (gdbarch) | |
215 | < gdbarch_num_regs (gdbarch)) | |
216 | *frame_regnum = gdbarch_sp_regnum (gdbarch); | |
20bcf01c AC |
217 | else |
218 | /* Should this be an internal error? I guess so, it is reflecting | |
219 | an architectural limitation in the current design. */ | |
0e2de366 MS |
220 | internal_error (__FILE__, __LINE__, |
221 | _("No virtual frame pointer available")); | |
39d4ef09 AC |
222 | *frame_offset = 0; |
223 | } | |
46cd78fb | 224 | |
9b790ce7 UW |
225 | /* Return a floating-point format for a floating-point variable of |
226 | length LEN in bits. If non-NULL, NAME is the name of its type. | |
227 | If no suitable type is found, return NULL. */ | |
228 | ||
229 | const struct floatformat ** | |
230 | default_floatformat_for_type (struct gdbarch *gdbarch, | |
231 | const char *name, int len) | |
232 | { | |
233 | const struct floatformat **format = NULL; | |
234 | ||
235 | if (len == gdbarch_half_bit (gdbarch)) | |
236 | format = gdbarch_half_format (gdbarch); | |
237 | else if (len == gdbarch_float_bit (gdbarch)) | |
238 | format = gdbarch_float_format (gdbarch); | |
239 | else if (len == gdbarch_double_bit (gdbarch)) | |
240 | format = gdbarch_double_format (gdbarch); | |
241 | else if (len == gdbarch_long_double_bit (gdbarch)) | |
242 | format = gdbarch_long_double_format (gdbarch); | |
243 | /* On i386 the 'long double' type takes 96 bits, | |
244 | while the real number of used bits is only 80, | |
245 | both in processor and in memory. | |
246 | The code below accepts the real bit size. */ | |
247 | else if (gdbarch_long_double_format (gdbarch) != NULL | |
248 | && len == gdbarch_long_double_format (gdbarch)[0]->totalsize) | |
249 | format = gdbarch_long_double_format (gdbarch); | |
250 | ||
251 | return format; | |
252 | } | |
d7bd68ca | 253 | \f |
13d01224 | 254 | int |
76a8ddb9 UW |
255 | generic_convert_register_p (struct gdbarch *gdbarch, int regnum, |
256 | struct type *type) | |
13d01224 | 257 | { |
9730f241 | 258 | return 0; |
13d01224 AC |
259 | } |
260 | ||
192cb3d4 MK |
261 | int |
262 | default_stabs_argument_has_addr (struct gdbarch *gdbarch, struct type *type) | |
263 | { | |
192cb3d4 MK |
264 | return 0; |
265 | } | |
266 | ||
3ca64954 RC |
267 | int |
268 | generic_instruction_nullified (struct gdbarch *gdbarch, | |
269 | struct regcache *regcache) | |
270 | { | |
271 | return 0; | |
272 | } | |
273 | ||
123dc839 DJ |
274 | int |
275 | default_remote_register_number (struct gdbarch *gdbarch, | |
276 | int regno) | |
277 | { | |
278 | return regno; | |
279 | } | |
280 | ||
3437254d PA |
281 | /* See arch-utils.h. */ |
282 | ||
283 | int | |
284 | default_vsyscall_range (struct gdbarch *gdbarch, struct mem_range *range) | |
285 | { | |
286 | return 0; | |
287 | } | |
288 | ||
01fb7433 | 289 | \f |
b4a20239 AC |
290 | /* Functions to manipulate the endianness of the target. */ |
291 | ||
f486487f | 292 | static enum bfd_endian target_byte_order_user = BFD_ENDIAN_UNKNOWN; |
b4a20239 | 293 | |
53904c9e AC |
294 | static const char endian_big[] = "big"; |
295 | static const char endian_little[] = "little"; | |
296 | static const char endian_auto[] = "auto"; | |
40478521 | 297 | static const char *const endian_enum[] = |
b4a20239 AC |
298 | { |
299 | endian_big, | |
300 | endian_little, | |
301 | endian_auto, | |
302 | NULL, | |
303 | }; | |
53904c9e | 304 | static const char *set_endian_string; |
b4a20239 | 305 | |
b6d373df DJ |
306 | enum bfd_endian |
307 | selected_byte_order (void) | |
308 | { | |
e17c207e | 309 | return target_byte_order_user; |
b6d373df DJ |
310 | } |
311 | ||
b4a20239 AC |
312 | /* Called by ``show endian''. */ |
313 | ||
314 | static void | |
7ab04401 AC |
315 | show_endian (struct ui_file *file, int from_tty, struct cmd_list_element *c, |
316 | const char *value) | |
b4a20239 | 317 | { |
7b6b9e83 | 318 | if (target_byte_order_user == BFD_ENDIAN_UNKNOWN) |
e17c207e | 319 | if (gdbarch_byte_order (get_current_arch ()) == BFD_ENDIAN_BIG) |
7ab04401 AC |
320 | fprintf_unfiltered (file, _("The target endianness is set automatically " |
321 | "(currently big endian)\n")); | |
edefbb7c | 322 | else |
7ab04401 | 323 | fprintf_unfiltered (file, _("The target endianness is set automatically " |
3e43a32a | 324 | "(currently little endian)\n")); |
b4a20239 | 325 | else |
e17c207e | 326 | if (target_byte_order_user == BFD_ENDIAN_BIG) |
7ab04401 AC |
327 | fprintf_unfiltered (file, |
328 | _("The target is assumed to be big endian\n")); | |
329 | else | |
330 | fprintf_unfiltered (file, | |
331 | _("The target is assumed to be little endian\n")); | |
b4a20239 AC |
332 | } |
333 | ||
334 | static void | |
eb4c3f4a | 335 | set_endian (const char *ignore_args, int from_tty, struct cmd_list_element *c) |
b4a20239 | 336 | { |
7a107747 DJ |
337 | struct gdbarch_info info; |
338 | ||
339 | gdbarch_info_init (&info); | |
340 | ||
3fd3d7d2 | 341 | if (set_endian_string == endian_auto) |
b4a20239 | 342 | { |
7a107747 DJ |
343 | target_byte_order_user = BFD_ENDIAN_UNKNOWN; |
344 | if (! gdbarch_update_p (info)) | |
345 | internal_error (__FILE__, __LINE__, | |
346 | _("set_endian: architecture update failed")); | |
b4a20239 AC |
347 | } |
348 | else if (set_endian_string == endian_little) | |
349 | { | |
d90cf509 AC |
350 | info.byte_order = BFD_ENDIAN_LITTLE; |
351 | if (! gdbarch_update_p (info)) | |
edefbb7c | 352 | printf_unfiltered (_("Little endian target not supported by GDB\n")); |
7a107747 DJ |
353 | else |
354 | target_byte_order_user = BFD_ENDIAN_LITTLE; | |
b4a20239 AC |
355 | } |
356 | else if (set_endian_string == endian_big) | |
357 | { | |
d90cf509 AC |
358 | info.byte_order = BFD_ENDIAN_BIG; |
359 | if (! gdbarch_update_p (info)) | |
edefbb7c | 360 | printf_unfiltered (_("Big endian target not supported by GDB\n")); |
7a107747 DJ |
361 | else |
362 | target_byte_order_user = BFD_ENDIAN_BIG; | |
b4a20239 AC |
363 | } |
364 | else | |
8e65ff28 | 365 | internal_error (__FILE__, __LINE__, |
edefbb7c | 366 | _("set_endian: bad value")); |
7a107747 | 367 | |
7ab04401 | 368 | show_endian (gdb_stdout, from_tty, NULL, NULL); |
b4a20239 AC |
369 | } |
370 | ||
23181151 | 371 | /* Given SELECTED, a currently selected BFD architecture, and |
e35359c5 UW |
372 | TARGET_DESC, the current target description, return what |
373 | architecture to use. | |
374 | ||
375 | SELECTED may be NULL, in which case we return the architecture | |
376 | associated with TARGET_DESC. If SELECTED specifies a variant | |
377 | of the architecture associtated with TARGET_DESC, return the | |
378 | more specific of the two. | |
379 | ||
380 | If SELECTED is a different architecture, but it is accepted as | |
381 | compatible by the target, we can use the target architecture. | |
382 | ||
383 | If SELECTED is obviously incompatible, warn the user. */ | |
23181151 DJ |
384 | |
385 | static const struct bfd_arch_info * | |
e35359c5 UW |
386 | choose_architecture_for_target (const struct target_desc *target_desc, |
387 | const struct bfd_arch_info *selected) | |
23181151 | 388 | { |
e35359c5 | 389 | const struct bfd_arch_info *from_target = tdesc_architecture (target_desc); |
23181151 DJ |
390 | const struct bfd_arch_info *compat1, *compat2; |
391 | ||
392 | if (selected == NULL) | |
393 | return from_target; | |
394 | ||
395 | if (from_target == NULL) | |
396 | return selected; | |
397 | ||
398 | /* struct bfd_arch_info objects are singletons: that is, there's | |
399 | supposed to be exactly one instance for a given machine. So you | |
400 | can tell whether two are equivalent by comparing pointers. */ | |
401 | if (from_target == selected) | |
402 | return selected; | |
403 | ||
404 | /* BFD's 'A->compatible (A, B)' functions return zero if A and B are | |
405 | incompatible. But if they are compatible, it returns the 'more | |
406 | featureful' of the two arches. That is, if A can run code | |
407 | written for B, but B can't run code written for A, then it'll | |
408 | return A. | |
409 | ||
410 | Some targets (e.g. MIPS as of 2006-12-04) don't fully | |
411 | implement this, instead always returning NULL or the first | |
412 | argument. We detect that case by checking both directions. */ | |
413 | ||
414 | compat1 = selected->compatible (selected, from_target); | |
415 | compat2 = from_target->compatible (from_target, selected); | |
416 | ||
417 | if (compat1 == NULL && compat2 == NULL) | |
418 | { | |
0e2de366 MS |
419 | /* BFD considers the architectures incompatible. Check our |
420 | target description whether it accepts SELECTED as compatible | |
421 | anyway. */ | |
e35359c5 UW |
422 | if (tdesc_compatible_p (target_desc, selected)) |
423 | return from_target; | |
424 | ||
23181151 DJ |
425 | warning (_("Selected architecture %s is not compatible " |
426 | "with reported target architecture %s"), | |
427 | selected->printable_name, from_target->printable_name); | |
428 | return selected; | |
429 | } | |
430 | ||
431 | if (compat1 == NULL) | |
432 | return compat2; | |
433 | if (compat2 == NULL) | |
434 | return compat1; | |
435 | if (compat1 == compat2) | |
436 | return compat1; | |
437 | ||
0e2de366 MS |
438 | /* If the two didn't match, but one of them was a default |
439 | architecture, assume the more specific one is correct. This | |
440 | handles the case where an executable or target description just | |
441 | says "mips", but the other knows which MIPS variant. */ | |
23181151 DJ |
442 | if (compat1->the_default) |
443 | return compat2; | |
444 | if (compat2->the_default) | |
445 | return compat1; | |
446 | ||
447 | /* We have no idea which one is better. This is a bug, but not | |
448 | a critical problem; warn the user. */ | |
449 | warning (_("Selected architecture %s is ambiguous with " | |
450 | "reported target architecture %s"), | |
451 | selected->printable_name, from_target->printable_name); | |
452 | return selected; | |
453 | } | |
454 | ||
0e2de366 | 455 | /* Functions to manipulate the architecture of the target. */ |
b4a20239 AC |
456 | |
457 | enum set_arch { set_arch_auto, set_arch_manual }; | |
458 | ||
7a107747 | 459 | static const struct bfd_arch_info *target_architecture_user; |
b4a20239 | 460 | |
a8cf2722 AC |
461 | static const char *set_architecture_string; |
462 | ||
463 | const char * | |
464 | selected_architecture_name (void) | |
465 | { | |
7a107747 | 466 | if (target_architecture_user == NULL) |
a8cf2722 AC |
467 | return NULL; |
468 | else | |
469 | return set_architecture_string; | |
470 | } | |
b4a20239 | 471 | |
b4a20239 | 472 | /* Called if the user enters ``show architecture'' without an |
0e2de366 | 473 | argument. */ |
b4a20239 AC |
474 | |
475 | static void | |
7ab04401 AC |
476 | show_architecture (struct ui_file *file, int from_tty, |
477 | struct cmd_list_element *c, const char *value) | |
b4a20239 | 478 | { |
7a107747 | 479 | if (target_architecture_user == NULL) |
3e43a32a MS |
480 | fprintf_filtered (file, _("The target architecture is set " |
481 | "automatically (currently %s)\n"), | |
482 | gdbarch_bfd_arch_info (get_current_arch ())->printable_name); | |
b4a20239 | 483 | else |
3e43a32a MS |
484 | fprintf_filtered (file, _("The target architecture is assumed to be %s\n"), |
485 | set_architecture_string); | |
b4a20239 AC |
486 | } |
487 | ||
488 | ||
489 | /* Called if the user enters ``set architecture'' with or without an | |
0e2de366 | 490 | argument. */ |
b4a20239 AC |
491 | |
492 | static void | |
eb4c3f4a TT |
493 | set_architecture (const char *ignore_args, |
494 | int from_tty, struct cmd_list_element *c) | |
b4a20239 | 495 | { |
7a107747 DJ |
496 | struct gdbarch_info info; |
497 | ||
498 | gdbarch_info_init (&info); | |
499 | ||
b4a20239 AC |
500 | if (strcmp (set_architecture_string, "auto") == 0) |
501 | { | |
7a107747 DJ |
502 | target_architecture_user = NULL; |
503 | if (!gdbarch_update_p (info)) | |
504 | internal_error (__FILE__, __LINE__, | |
505 | _("could not select an architecture automatically")); | |
b4a20239 | 506 | } |
d90cf509 | 507 | else |
b4a20239 | 508 | { |
b4a20239 AC |
509 | info.bfd_arch_info = bfd_scan_arch (set_architecture_string); |
510 | if (info.bfd_arch_info == NULL) | |
8e65ff28 | 511 | internal_error (__FILE__, __LINE__, |
edefbb7c | 512 | _("set_architecture: bfd_scan_arch failed")); |
16f33e29 | 513 | if (gdbarch_update_p (info)) |
7a107747 | 514 | target_architecture_user = info.bfd_arch_info; |
b4a20239 | 515 | else |
edefbb7c | 516 | printf_unfiltered (_("Architecture `%s' not recognized.\n"), |
b4a20239 AC |
517 | set_architecture_string); |
518 | } | |
7ab04401 | 519 | show_architecture (gdb_stdout, from_tty, NULL, NULL); |
b4a20239 AC |
520 | } |
521 | ||
ebdba546 | 522 | /* Try to select a global architecture that matches "info". Return |
0f9741f2 | 523 | non-zero if the attempt succeeds. */ |
ebdba546 AC |
524 | int |
525 | gdbarch_update_p (struct gdbarch_info info) | |
526 | { | |
a7f1256d UW |
527 | struct gdbarch *new_gdbarch; |
528 | ||
529 | /* Check for the current file. */ | |
530 | if (info.abfd == NULL) | |
531 | info.abfd = exec_bfd; | |
532 | if (info.abfd == NULL) | |
533 | info.abfd = core_bfd; | |
534 | ||
535 | /* Check for the current target description. */ | |
536 | if (info.target_desc == NULL) | |
537 | info.target_desc = target_current_description (); | |
538 | ||
539 | new_gdbarch = gdbarch_find_by_info (info); | |
ebdba546 AC |
540 | |
541 | /* If there no architecture by that name, reject the request. */ | |
542 | if (new_gdbarch == NULL) | |
543 | { | |
544 | if (gdbarch_debug) | |
545 | fprintf_unfiltered (gdb_stdlog, "gdbarch_update_p: " | |
546 | "Architecture not found\n"); | |
547 | return 0; | |
548 | } | |
549 | ||
550 | /* If it is the same old architecture, accept the request (but don't | |
551 | swap anything). */ | |
f5656ead | 552 | if (new_gdbarch == target_gdbarch ()) |
ebdba546 AC |
553 | { |
554 | if (gdbarch_debug) | |
555 | fprintf_unfiltered (gdb_stdlog, "gdbarch_update_p: " | |
e3cb3832 JB |
556 | "Architecture %s (%s) unchanged\n", |
557 | host_address_to_string (new_gdbarch), | |
ebdba546 AC |
558 | gdbarch_bfd_arch_info (new_gdbarch)->printable_name); |
559 | return 1; | |
560 | } | |
561 | ||
562 | /* It's a new architecture, swap it in. */ | |
563 | if (gdbarch_debug) | |
564 | fprintf_unfiltered (gdb_stdlog, "gdbarch_update_p: " | |
e3cb3832 JB |
565 | "New architecture %s (%s) selected\n", |
566 | host_address_to_string (new_gdbarch), | |
ebdba546 | 567 | gdbarch_bfd_arch_info (new_gdbarch)->printable_name); |
aff68abb | 568 | set_target_gdbarch (new_gdbarch); |
ebdba546 AC |
569 | |
570 | return 1; | |
571 | } | |
572 | ||
2b026650 MK |
573 | /* Return the architecture for ABFD. If no suitable architecture |
574 | could be find, return NULL. */ | |
575 | ||
576 | struct gdbarch * | |
577 | gdbarch_from_bfd (bfd *abfd) | |
b4a20239 | 578 | { |
d90cf509 AC |
579 | struct gdbarch_info info; |
580 | gdbarch_info_init (&info); | |
05c547f6 | 581 | |
d90cf509 | 582 | info.abfd = abfd; |
b60eb90d | 583 | return gdbarch_find_by_info (info); |
2b026650 MK |
584 | } |
585 | ||
586 | /* Set the dynamic target-system-dependent parameters (architecture, | |
587 | byte-order) using information found in the BFD */ | |
588 | ||
589 | void | |
590 | set_gdbarch_from_file (bfd *abfd) | |
591 | { | |
a7f1256d | 592 | struct gdbarch_info info; |
2b026650 MK |
593 | struct gdbarch *gdbarch; |
594 | ||
a7f1256d UW |
595 | gdbarch_info_init (&info); |
596 | info.abfd = abfd; | |
597 | info.target_desc = target_current_description (); | |
598 | gdbarch = gdbarch_find_by_info (info); | |
599 | ||
2b026650 | 600 | if (gdbarch == NULL) |
8a3fe4f8 | 601 | error (_("Architecture of file not recognized.")); |
aff68abb | 602 | set_target_gdbarch (gdbarch); |
b4a20239 AC |
603 | } |
604 | ||
605 | /* Initialize the current architecture. Update the ``set | |
606 | architecture'' command so that it specifies a list of valid | |
607 | architectures. */ | |
608 | ||
1ba607ad AC |
609 | #ifdef DEFAULT_BFD_ARCH |
610 | extern const bfd_arch_info_type DEFAULT_BFD_ARCH; | |
611 | static const bfd_arch_info_type *default_bfd_arch = &DEFAULT_BFD_ARCH; | |
612 | #else | |
4b9b3959 | 613 | static const bfd_arch_info_type *default_bfd_arch; |
1ba607ad AC |
614 | #endif |
615 | ||
616 | #ifdef DEFAULT_BFD_VEC | |
617 | extern const bfd_target DEFAULT_BFD_VEC; | |
618 | static const bfd_target *default_bfd_vec = &DEFAULT_BFD_VEC; | |
619 | #else | |
620 | static const bfd_target *default_bfd_vec; | |
621 | #endif | |
622 | ||
f486487f | 623 | static enum bfd_endian default_byte_order = BFD_ENDIAN_UNKNOWN; |
7a107747 | 624 | |
b4a20239 AC |
625 | void |
626 | initialize_current_architecture (void) | |
627 | { | |
628 | const char **arches = gdbarch_printable_names (); | |
05c547f6 | 629 | struct gdbarch_info info; |
b4a20239 | 630 | |
0e2de366 | 631 | /* determine a default architecture and byte order. */ |
fb6ecb0f | 632 | gdbarch_info_init (&info); |
1ba607ad | 633 | |
0e2de366 | 634 | /* Find a default architecture. */ |
7a107747 | 635 | if (default_bfd_arch == NULL) |
b4a20239 | 636 | { |
1ba607ad | 637 | /* Choose the architecture by taking the first one |
0e2de366 | 638 | alphabetically. */ |
1ba607ad | 639 | const char *chosen = arches[0]; |
b4a20239 | 640 | const char **arch; |
b4a20239 AC |
641 | for (arch = arches; *arch != NULL; arch++) |
642 | { | |
b4a20239 AC |
643 | if (strcmp (*arch, chosen) < 0) |
644 | chosen = *arch; | |
645 | } | |
646 | if (chosen == NULL) | |
8e65ff28 | 647 | internal_error (__FILE__, __LINE__, |
edefbb7c | 648 | _("initialize_current_architecture: No arch")); |
7a107747 DJ |
649 | default_bfd_arch = bfd_scan_arch (chosen); |
650 | if (default_bfd_arch == NULL) | |
8e65ff28 | 651 | internal_error (__FILE__, __LINE__, |
edefbb7c | 652 | _("initialize_current_architecture: Arch not found")); |
1ba607ad AC |
653 | } |
654 | ||
7a107747 DJ |
655 | info.bfd_arch_info = default_bfd_arch; |
656 | ||
afe64c1a | 657 | /* Take several guesses at a byte order. */ |
7a107747 | 658 | if (default_byte_order == BFD_ENDIAN_UNKNOWN |
1ba607ad AC |
659 | && default_bfd_vec != NULL) |
660 | { | |
0e2de366 | 661 | /* Extract BFD's default vector's byte order. */ |
1ba607ad AC |
662 | switch (default_bfd_vec->byteorder) |
663 | { | |
664 | case BFD_ENDIAN_BIG: | |
7a107747 | 665 | default_byte_order = BFD_ENDIAN_BIG; |
1ba607ad AC |
666 | break; |
667 | case BFD_ENDIAN_LITTLE: | |
7a107747 | 668 | default_byte_order = BFD_ENDIAN_LITTLE; |
1ba607ad AC |
669 | break; |
670 | default: | |
671 | break; | |
672 | } | |
673 | } | |
7a107747 | 674 | if (default_byte_order == BFD_ENDIAN_UNKNOWN) |
1ba607ad | 675 | { |
0e2de366 | 676 | /* look for ``*el-*'' in the target name. */ |
1ba607ad AC |
677 | const char *chp; |
678 | chp = strchr (target_name, '-'); | |
679 | if (chp != NULL | |
680 | && chp - 2 >= target_name | |
61012eef | 681 | && startswith (chp - 2, "el")) |
7a107747 | 682 | default_byte_order = BFD_ENDIAN_LITTLE; |
1ba607ad | 683 | } |
7a107747 | 684 | if (default_byte_order == BFD_ENDIAN_UNKNOWN) |
1ba607ad AC |
685 | { |
686 | /* Wire it to big-endian!!! */ | |
7a107747 | 687 | default_byte_order = BFD_ENDIAN_BIG; |
1ba607ad AC |
688 | } |
689 | ||
7a107747 | 690 | info.byte_order = default_byte_order; |
9d4fde75 | 691 | info.byte_order_for_code = info.byte_order; |
7a107747 | 692 | |
d90cf509 AC |
693 | if (! gdbarch_update_p (info)) |
694 | internal_error (__FILE__, __LINE__, | |
edefbb7c AC |
695 | _("initialize_current_architecture: Selection of " |
696 | "initial architecture failed")); | |
b4a20239 | 697 | |
1ba607ad | 698 | /* Create the ``set architecture'' command appending ``auto'' to the |
0e2de366 | 699 | list of architectures. */ |
b4a20239 | 700 | { |
0e2de366 | 701 | /* Append ``auto''. */ |
b4a20239 AC |
702 | int nr; |
703 | for (nr = 0; arches[nr] != NULL; nr++); | |
224c3ddb | 704 | arches = XRESIZEVEC (const char *, arches, nr + 2); |
b4a20239 AC |
705 | arches[nr + 0] = "auto"; |
706 | arches[nr + 1] = NULL; | |
7ab04401 | 707 | add_setshow_enum_cmd ("architecture", class_support, |
3e43a32a MS |
708 | arches, &set_architecture_string, |
709 | _("Set architecture of target."), | |
710 | _("Show architecture of target."), NULL, | |
7ab04401 AC |
711 | set_architecture, show_architecture, |
712 | &setlist, &showlist); | |
b4a20239 | 713 | add_alias_cmd ("processor", "architecture", class_support, 1, &setlist); |
b4a20239 AC |
714 | } |
715 | } | |
716 | ||
717 | ||
fb6ecb0f AC |
718 | /* Initialize a gdbarch info to values that will be automatically |
719 | overridden. Note: Originally, this ``struct info'' was initialized | |
ce2826aa | 720 | using memset(0). Unfortunately, that ran into problems, namely |
fb6ecb0f AC |
721 | BFD_ENDIAN_BIG is zero. An explicit initialization function that |
722 | can explicitly set each field to a well defined value is used. */ | |
723 | ||
724 | void | |
725 | gdbarch_info_init (struct gdbarch_info *info) | |
726 | { | |
727 | memset (info, 0, sizeof (struct gdbarch_info)); | |
428721aa | 728 | info->byte_order = BFD_ENDIAN_UNKNOWN; |
9d4fde75 | 729 | info->byte_order_for_code = info->byte_order; |
4be87837 | 730 | info->osabi = GDB_OSABI_UNINITIALIZED; |
fb6ecb0f AC |
731 | } |
732 | ||
100bcc3f | 733 | /* Similar to init, but this time fill in the blanks. Information is |
7a107747 DJ |
734 | obtained from the global "set ..." options and explicitly |
735 | initialized INFO fields. */ | |
bf922ad9 AC |
736 | |
737 | void | |
7a107747 | 738 | gdbarch_info_fill (struct gdbarch_info *info) |
bf922ad9 AC |
739 | { |
740 | /* "(gdb) set architecture ...". */ | |
741 | if (info->bfd_arch_info == NULL | |
7a107747 DJ |
742 | && target_architecture_user) |
743 | info->bfd_arch_info = target_architecture_user; | |
424163ea | 744 | /* From the file. */ |
bf922ad9 AC |
745 | if (info->bfd_arch_info == NULL |
746 | && info->abfd != NULL | |
747 | && bfd_get_arch (info->abfd) != bfd_arch_unknown | |
748 | && bfd_get_arch (info->abfd) != bfd_arch_obscure) | |
749 | info->bfd_arch_info = bfd_get_arch_info (info->abfd); | |
23181151 DJ |
750 | /* From the target. */ |
751 | if (info->target_desc != NULL) | |
752 | info->bfd_arch_info = choose_architecture_for_target | |
e35359c5 | 753 | (info->target_desc, info->bfd_arch_info); |
7a107747 DJ |
754 | /* From the default. */ |
755 | if (info->bfd_arch_info == NULL) | |
756 | info->bfd_arch_info = default_bfd_arch; | |
bf922ad9 AC |
757 | |
758 | /* "(gdb) set byte-order ...". */ | |
759 | if (info->byte_order == BFD_ENDIAN_UNKNOWN | |
7a107747 DJ |
760 | && target_byte_order_user != BFD_ENDIAN_UNKNOWN) |
761 | info->byte_order = target_byte_order_user; | |
bf922ad9 AC |
762 | /* From the INFO struct. */ |
763 | if (info->byte_order == BFD_ENDIAN_UNKNOWN | |
764 | && info->abfd != NULL) | |
765 | info->byte_order = (bfd_big_endian (info->abfd) ? BFD_ENDIAN_BIG | |
7a107747 DJ |
766 | : bfd_little_endian (info->abfd) ? BFD_ENDIAN_LITTLE |
767 | : BFD_ENDIAN_UNKNOWN); | |
768 | /* From the default. */ | |
769 | if (info->byte_order == BFD_ENDIAN_UNKNOWN) | |
770 | info->byte_order = default_byte_order; | |
9d4fde75 | 771 | info->byte_order_for_code = info->byte_order; |
bf922ad9 AC |
772 | |
773 | /* "(gdb) set osabi ...". Handled by gdbarch_lookup_osabi. */ | |
08d16641 | 774 | /* From the manual override, or from file. */ |
bf922ad9 AC |
775 | if (info->osabi == GDB_OSABI_UNINITIALIZED) |
776 | info->osabi = gdbarch_lookup_osabi (info->abfd); | |
08d16641 PA |
777 | /* From the target. */ |
778 | if (info->osabi == GDB_OSABI_UNKNOWN && info->target_desc != NULL) | |
779 | info->osabi = tdesc_osabi (info->target_desc); | |
780 | /* From the configured default. */ | |
f4290e2a | 781 | #ifdef GDB_OSABI_DEFAULT |
08d16641 PA |
782 | if (info->osabi == GDB_OSABI_UNKNOWN) |
783 | info->osabi = GDB_OSABI_DEFAULT; | |
f4290e2a | 784 | #endif |
bf922ad9 AC |
785 | |
786 | /* Must have at least filled in the architecture. */ | |
787 | gdb_assert (info->bfd_arch_info != NULL); | |
788 | } | |
789 | ||
0e2de366 MS |
790 | /* Return "current" architecture. If the target is running, this is |
791 | the architecture of the selected frame. Otherwise, the "current" | |
792 | architecture defaults to the target architecture. | |
e17c207e | 793 | |
0e2de366 MS |
794 | This function should normally be called solely by the command |
795 | interpreter routines to determine the architecture to execute a | |
796 | command in. */ | |
e17c207e UW |
797 | struct gdbarch * |
798 | get_current_arch (void) | |
799 | { | |
800 | if (has_stack_frames ()) | |
801 | return get_frame_arch (get_selected_frame (NULL)); | |
802 | else | |
f5656ead | 803 | return target_gdbarch (); |
e17c207e UW |
804 | } |
805 | ||
6c95b8df PA |
806 | int |
807 | default_has_shared_address_space (struct gdbarch *gdbarch) | |
808 | { | |
809 | /* Simply say no. In most unix-like targets each inferior/process | |
810 | has its own address space. */ | |
811 | return 0; | |
812 | } | |
813 | ||
7a697b8d | 814 | int |
6b940e6a | 815 | default_fast_tracepoint_valid_at (struct gdbarch *gdbarch, CORE_ADDR addr, |
281d762b | 816 | std::string *msg) |
7a697b8d SS |
817 | { |
818 | /* We don't know if maybe the target has some way to do fast | |
819 | tracepoints that doesn't need gdbarch, so always say yes. */ | |
820 | if (msg) | |
281d762b | 821 | msg->clear (); |
7a697b8d SS |
822 | return 1; |
823 | } | |
824 | ||
22f13eb8 YQ |
825 | const gdb_byte * |
826 | default_breakpoint_from_pc (struct gdbarch *gdbarch, CORE_ADDR *pcptr, | |
827 | int *lenptr) | |
828 | { | |
829 | int kind = gdbarch_breakpoint_kind_from_pc (gdbarch, pcptr); | |
830 | ||
831 | return gdbarch_sw_breakpoint_from_kind (gdbarch, kind, lenptr); | |
832 | } | |
833b7ab5 YQ |
833 | int |
834 | default_breakpoint_kind_from_current_state (struct gdbarch *gdbarch, | |
835 | struct regcache *regcache, | |
836 | CORE_ADDR *pcptr) | |
837 | { | |
838 | return gdbarch_breakpoint_kind_from_pc (gdbarch, pcptr); | |
839 | } | |
840 | ||
22f13eb8 | 841 | |
6710bf39 SS |
842 | void |
843 | default_gen_return_address (struct gdbarch *gdbarch, | |
844 | struct agent_expr *ax, struct axs_value *value, | |
845 | CORE_ADDR scope) | |
846 | { | |
847 | error (_("This architecture has no method to collect a return address.")); | |
848 | } | |
849 | ||
18648a37 YQ |
850 | int |
851 | default_return_in_first_hidden_param_p (struct gdbarch *gdbarch, | |
852 | struct type *type) | |
853 | { | |
854 | /* Usually, the return value's address is stored the in the "first hidden" | |
855 | parameter if the return value should be passed by reference, as | |
856 | specified in ABI. */ | |
857 | return language_pass_by_reference (type); | |
858 | } | |
859 | ||
c2170eef MM |
860 | int default_insn_is_call (struct gdbarch *gdbarch, CORE_ADDR addr) |
861 | { | |
862 | return 0; | |
863 | } | |
864 | ||
865 | int default_insn_is_ret (struct gdbarch *gdbarch, CORE_ADDR addr) | |
866 | { | |
867 | return 0; | |
868 | } | |
869 | ||
870 | int default_insn_is_jump (struct gdbarch *gdbarch, CORE_ADDR addr) | |
871 | { | |
872 | return 0; | |
873 | } | |
874 | ||
ae9bb220 PA |
875 | void |
876 | default_skip_permanent_breakpoint (struct regcache *regcache) | |
877 | { | |
ac7936df | 878 | struct gdbarch *gdbarch = regcache->arch (); |
ae9bb220 | 879 | CORE_ADDR current_pc = regcache_read_pc (regcache); |
ae9bb220 PA |
880 | int bp_len; |
881 | ||
ac298888 | 882 | gdbarch_breakpoint_from_pc (gdbarch, ¤t_pc, &bp_len); |
ae9bb220 PA |
883 | current_pc += bp_len; |
884 | regcache_write_pc (regcache, current_pc); | |
885 | } | |
c0e8c252 | 886 | |
f208eee0 JK |
887 | CORE_ADDR |
888 | default_infcall_mmap (CORE_ADDR size, unsigned prot) | |
889 | { | |
890 | error (_("This target does not support inferior memory allocation by mmap.")); | |
891 | } | |
892 | ||
7f361056 JK |
893 | void |
894 | default_infcall_munmap (CORE_ADDR addr, CORE_ADDR size) | |
895 | { | |
896 | /* Memory reserved by inferior mmap is kept leaked. */ | |
897 | } | |
898 | ||
f208eee0 JK |
899 | /* -mcmodel=large is used so that no GOT (Global Offset Table) is needed to be |
900 | created in inferior memory by GDB (normally it is set by ld.so). */ | |
901 | ||
902 | char * | |
903 | default_gcc_target_options (struct gdbarch *gdbarch) | |
904 | { | |
905 | return xstrprintf ("-m%d%s", gdbarch_ptr_bit (gdbarch), | |
906 | gdbarch_ptr_bit (gdbarch) == 64 ? " -mcmodel=large" : ""); | |
907 | } | |
908 | ||
ac04f72b TT |
909 | /* gdbarch gnu_triplet_regexp method. */ |
910 | ||
911 | const char * | |
912 | default_gnu_triplet_regexp (struct gdbarch *gdbarch) | |
913 | { | |
914 | return gdbarch_bfd_arch_info (gdbarch)->arch_name; | |
915 | } | |
916 | ||
3374165f SM |
917 | /* Default method for gdbarch_addressable_memory_unit_size. By default, a memory byte has |
918 | a size of 1 octet. */ | |
919 | ||
920 | int | |
921 | default_addressable_memory_unit_size (struct gdbarch *gdbarch) | |
922 | { | |
923 | return 1; | |
924 | } | |
925 | ||
5f034a78 MK |
926 | void |
927 | default_guess_tracepoint_registers (struct gdbarch *gdbarch, | |
928 | struct regcache *regcache, | |
929 | CORE_ADDR addr) | |
930 | { | |
931 | int pc_regno = gdbarch_pc_regnum (gdbarch); | |
932 | gdb_byte *regs; | |
933 | ||
934 | /* This guessing code below only works if the PC register isn't | |
935 | a pseudo-register. The value of a pseudo-register isn't stored | |
936 | in the (non-readonly) regcache -- instead it's recomputed | |
937 | (probably from some other cached raw register) whenever the | |
938 | register is read. In this case, a custom method implementation | |
939 | should be used by the architecture. */ | |
940 | if (pc_regno < 0 || pc_regno >= gdbarch_num_regs (gdbarch)) | |
941 | return; | |
942 | ||
943 | regs = (gdb_byte *) alloca (register_size (gdbarch, pc_regno)); | |
944 | store_unsigned_integer (regs, register_size (gdbarch, pc_regno), | |
945 | gdbarch_byte_order (gdbarch), addr); | |
946 | regcache_raw_supply (regcache, pc_regno, regs); | |
947 | } | |
948 | ||
39503f82 YQ |
949 | int |
950 | default_print_insn (bfd_vma memaddr, disassemble_info *info) | |
951 | { | |
952 | disassembler_ftype disassemble_fn; | |
953 | ||
39503f82 YQ |
954 | disassemble_fn = disassembler (info->arch, info->endian == BFD_ENDIAN_BIG, |
955 | info->mach, exec_bfd); | |
956 | ||
957 | gdb_assert (disassemble_fn != NULL); | |
958 | return (*disassemble_fn) (memaddr, info); | |
959 | } | |
960 | ||
46a62268 YQ |
961 | /* See arch-utils.h. */ |
962 | ||
963 | CORE_ADDR | |
964 | gdbarch_skip_prologue_noexcept (gdbarch *gdbarch, CORE_ADDR pc) noexcept | |
965 | { | |
966 | CORE_ADDR new_pc = pc; | |
967 | ||
968 | TRY | |
969 | { | |
970 | new_pc = gdbarch_skip_prologue (gdbarch, pc); | |
971 | } | |
972 | CATCH (ex, RETURN_MASK_ALL) | |
973 | {} | |
974 | END_CATCH | |
975 | ||
976 | return new_pc; | |
977 | } | |
978 | ||
c0e8c252 | 979 | void |
b4a20239 | 980 | _initialize_gdbarch_utils (void) |
c0e8c252 | 981 | { |
7ab04401 | 982 | add_setshow_enum_cmd ("endian", class_support, |
3e43a32a MS |
983 | endian_enum, &set_endian_string, |
984 | _("Set endianness of target."), | |
985 | _("Show endianness of target."), | |
986 | NULL, set_endian, show_endian, | |
7ab04401 | 987 | &setlist, &showlist); |
c0e8c252 | 988 | } |