1 /* Dynamic architecture support for GDB, the GNU debugger.
3 Copyright (C) 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007
4 Free Software Foundation, Inc.
6 This file is part of GDB.
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 3 of the License, or
11 (at your option) any later version.
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.
18 You should have received a copy of the GNU General Public License
19 along with this program. If not, see <http://www.gnu.org/licenses/>. */
23 #include "arch-utils.h"
26 #include "inferior.h" /* enum CALL_DUMMY_LOCATION et.al. */
27 #include "gdb_string.h"
29 #include "gdb_assert.h"
30 #include "sim-regno.h"
33 #include "target-descriptions.h"
37 #include "floatformat.h"
41 legacy_register_sim_regno (int regnum
)
43 /* Only makes sense to supply raw registers. */
44 gdb_assert (regnum
>= 0 && regnum
< gdbarch_num_regs (current_gdbarch
));
45 /* NOTE: cagney/2002-05-13: The old code did it this way and it is
46 suspected that some GDB/SIM combinations may rely on this
47 behavour. The default should be one2one_register_sim_regno
49 if (gdbarch_register_name (current_gdbarch
, regnum
) != NULL
50 && gdbarch_register_name (current_gdbarch
, regnum
)[0] != '\0')
53 return LEGACY_SIM_REGNO_IGNORE
;
57 generic_skip_trampoline_code (struct frame_info
*frame
, CORE_ADDR pc
)
63 generic_skip_solib_resolver (struct gdbarch
*gdbarch
, CORE_ADDR pc
)
69 generic_in_solib_return_trampoline (CORE_ADDR pc
, char *name
)
75 generic_in_function_epilogue_p (struct gdbarch
*gdbarch
, CORE_ADDR pc
)
80 /* Helper functions for gdbarch_inner_than */
83 core_addr_lessthan (CORE_ADDR lhs
, CORE_ADDR rhs
)
89 core_addr_greaterthan (CORE_ADDR lhs
, CORE_ADDR rhs
)
94 /* Misc helper functions for targets. */
97 core_addr_identity (CORE_ADDR addr
)
103 convert_from_func_ptr_addr_identity (struct gdbarch
*gdbarch
, CORE_ADDR addr
,
104 struct target_ops
*targ
)
110 no_op_reg_to_regnum (int reg
)
116 default_elf_make_msymbol_special (asymbol
*sym
, struct minimal_symbol
*msym
)
122 default_coff_make_msymbol_special (int val
, struct minimal_symbol
*msym
)
128 cannot_register_not (int regnum
)
133 /* Legacy version of target_virtual_frame_pointer(). Assumes that
134 there is an gdbarch_deprecated_fp_regnum and that it is the same, cooked or
138 legacy_virtual_frame_pointer (CORE_ADDR pc
,
140 LONGEST
*frame_offset
)
142 /* FIXME: cagney/2002-09-13: This code is used when identifying the
143 frame pointer of the current PC. It is assuming that a single
144 register and an offset can determine this. I think it should
145 instead generate a byte code expression as that would work better
146 with things like Dwarf2's CFI. */
147 if (gdbarch_deprecated_fp_regnum (current_gdbarch
) >= 0
148 && gdbarch_deprecated_fp_regnum (current_gdbarch
)
149 < gdbarch_num_regs (current_gdbarch
))
150 *frame_regnum
= gdbarch_deprecated_fp_regnum (current_gdbarch
);
151 else if (gdbarch_sp_regnum (current_gdbarch
) >= 0
152 && gdbarch_sp_regnum (current_gdbarch
)
153 < gdbarch_num_regs (current_gdbarch
))
154 *frame_regnum
= gdbarch_sp_regnum (current_gdbarch
);
156 /* Should this be an internal error? I guess so, it is reflecting
157 an architectural limitation in the current design. */
158 internal_error (__FILE__
, __LINE__
, _("No virtual frame pointer available"));
164 generic_convert_register_p (int regnum
, struct type
*type
)
170 default_stabs_argument_has_addr (struct gdbarch
*gdbarch
, struct type
*type
)
176 generic_instruction_nullified (struct gdbarch
*gdbarch
,
177 struct regcache
*regcache
)
183 default_remote_register_number (struct gdbarch
*gdbarch
,
190 /* Functions to manipulate the endianness of the target. */
192 static int target_byte_order_user
= BFD_ENDIAN_UNKNOWN
;
194 static const char endian_big
[] = "big";
195 static const char endian_little
[] = "little";
196 static const char endian_auto
[] = "auto";
197 static const char *endian_enum
[] =
204 static const char *set_endian_string
;
207 selected_byte_order (void)
209 if (target_byte_order_user
!= BFD_ENDIAN_UNKNOWN
)
210 return gdbarch_byte_order (current_gdbarch
);
212 return BFD_ENDIAN_UNKNOWN
;
215 /* Called by ``show endian''. */
218 show_endian (struct ui_file
*file
, int from_tty
, struct cmd_list_element
*c
,
221 if (target_byte_order_user
== BFD_ENDIAN_UNKNOWN
)
222 if (gdbarch_byte_order (current_gdbarch
) == BFD_ENDIAN_BIG
)
223 fprintf_unfiltered (file
, _("The target endianness is set automatically "
224 "(currently big endian)\n"));
226 fprintf_unfiltered (file
, _("The target endianness is set automatically "
227 "(currently little endian)\n"));
229 if (gdbarch_byte_order (current_gdbarch
) == BFD_ENDIAN_BIG
)
230 fprintf_unfiltered (file
,
231 _("The target is assumed to be big endian\n"));
233 fprintf_unfiltered (file
,
234 _("The target is assumed to be little endian\n"));
238 set_endian (char *ignore_args
, int from_tty
, struct cmd_list_element
*c
)
240 struct gdbarch_info info
;
242 gdbarch_info_init (&info
);
244 if (set_endian_string
== endian_auto
)
246 target_byte_order_user
= BFD_ENDIAN_UNKNOWN
;
247 if (! gdbarch_update_p (info
))
248 internal_error (__FILE__
, __LINE__
,
249 _("set_endian: architecture update failed"));
251 else if (set_endian_string
== endian_little
)
253 info
.byte_order
= BFD_ENDIAN_LITTLE
;
254 if (! gdbarch_update_p (info
))
255 printf_unfiltered (_("Little endian target not supported by GDB\n"));
257 target_byte_order_user
= BFD_ENDIAN_LITTLE
;
259 else if (set_endian_string
== endian_big
)
261 info
.byte_order
= BFD_ENDIAN_BIG
;
262 if (! gdbarch_update_p (info
))
263 printf_unfiltered (_("Big endian target not supported by GDB\n"));
265 target_byte_order_user
= BFD_ENDIAN_BIG
;
268 internal_error (__FILE__
, __LINE__
,
269 _("set_endian: bad value"));
271 show_endian (gdb_stdout
, from_tty
, NULL
, NULL
);
274 /* Given SELECTED, a currently selected BFD architecture, and
275 FROM_TARGET, a BFD architecture reported by the target description,
276 return what architecture to use. Either may be NULL; if both are
277 specified, we use the more specific. If the two are obviously
278 incompatible, warn the user. */
280 static const struct bfd_arch_info
*
281 choose_architecture_for_target (const struct bfd_arch_info
*selected
,
282 const struct bfd_arch_info
*from_target
)
284 const struct bfd_arch_info
*compat1
, *compat2
;
286 if (selected
== NULL
)
289 if (from_target
== NULL
)
292 /* struct bfd_arch_info objects are singletons: that is, there's
293 supposed to be exactly one instance for a given machine. So you
294 can tell whether two are equivalent by comparing pointers. */
295 if (from_target
== selected
)
298 /* BFD's 'A->compatible (A, B)' functions return zero if A and B are
299 incompatible. But if they are compatible, it returns the 'more
300 featureful' of the two arches. That is, if A can run code
301 written for B, but B can't run code written for A, then it'll
304 Some targets (e.g. MIPS as of 2006-12-04) don't fully
305 implement this, instead always returning NULL or the first
306 argument. We detect that case by checking both directions. */
308 compat1
= selected
->compatible (selected
, from_target
);
309 compat2
= from_target
->compatible (from_target
, selected
);
311 if (compat1
== NULL
&& compat2
== NULL
)
313 warning (_("Selected architecture %s is not compatible "
314 "with reported target architecture %s"),
315 selected
->printable_name
, from_target
->printable_name
);
323 if (compat1
== compat2
)
326 /* If the two didn't match, but one of them was a default architecture,
327 assume the more specific one is correct. This handles the case
328 where an executable or target description just says "mips", but
329 the other knows which MIPS variant. */
330 if (compat1
->the_default
)
332 if (compat2
->the_default
)
335 /* We have no idea which one is better. This is a bug, but not
336 a critical problem; warn the user. */
337 warning (_("Selected architecture %s is ambiguous with "
338 "reported target architecture %s"),
339 selected
->printable_name
, from_target
->printable_name
);
343 /* Functions to manipulate the architecture of the target */
345 enum set_arch
{ set_arch_auto
, set_arch_manual
};
347 static const struct bfd_arch_info
*target_architecture_user
;
349 static const char *set_architecture_string
;
352 selected_architecture_name (void)
354 if (target_architecture_user
== NULL
)
357 return set_architecture_string
;
360 /* Called if the user enters ``show architecture'' without an
364 show_architecture (struct ui_file
*file
, int from_tty
,
365 struct cmd_list_element
*c
, const char *value
)
368 arch
= gdbarch_bfd_arch_info (current_gdbarch
)->printable_name
;
369 if (target_architecture_user
== NULL
)
370 fprintf_filtered (file
, _("\
371 The target architecture is set automatically (currently %s)\n"), arch
);
373 fprintf_filtered (file
, _("\
374 The target architecture is assumed to be %s\n"), arch
);
378 /* Called if the user enters ``set architecture'' with or without an
382 set_architecture (char *ignore_args
, int from_tty
, struct cmd_list_element
*c
)
384 struct gdbarch_info info
;
386 gdbarch_info_init (&info
);
388 if (strcmp (set_architecture_string
, "auto") == 0)
390 target_architecture_user
= NULL
;
391 if (!gdbarch_update_p (info
))
392 internal_error (__FILE__
, __LINE__
,
393 _("could not select an architecture automatically"));
397 info
.bfd_arch_info
= bfd_scan_arch (set_architecture_string
);
398 if (info
.bfd_arch_info
== NULL
)
399 internal_error (__FILE__
, __LINE__
,
400 _("set_architecture: bfd_scan_arch failed"));
401 if (gdbarch_update_p (info
))
402 target_architecture_user
= info
.bfd_arch_info
;
404 printf_unfiltered (_("Architecture `%s' not recognized.\n"),
405 set_architecture_string
);
407 show_architecture (gdb_stdout
, from_tty
, NULL
, NULL
);
410 /* Try to select a global architecture that matches "info". Return
411 non-zero if the attempt succeds. */
413 gdbarch_update_p (struct gdbarch_info info
)
415 struct gdbarch
*new_gdbarch
= gdbarch_find_by_info (info
);
417 /* If there no architecture by that name, reject the request. */
418 if (new_gdbarch
== NULL
)
421 fprintf_unfiltered (gdb_stdlog
, "gdbarch_update_p: "
422 "Architecture not found\n");
426 /* If it is the same old architecture, accept the request (but don't
428 if (new_gdbarch
== current_gdbarch
)
431 fprintf_unfiltered (gdb_stdlog
, "gdbarch_update_p: "
432 "Architecture 0x%08lx (%s) unchanged\n",
434 gdbarch_bfd_arch_info (new_gdbarch
)->printable_name
);
438 /* It's a new architecture, swap it in. */
440 fprintf_unfiltered (gdb_stdlog
, "gdbarch_update_p: "
441 "New architecture 0x%08lx (%s) selected\n",
443 gdbarch_bfd_arch_info (new_gdbarch
)->printable_name
);
444 deprecated_current_gdbarch_select_hack (new_gdbarch
);
449 /* Return the architecture for ABFD. If no suitable architecture
450 could be find, return NULL. */
453 gdbarch_from_bfd (bfd
*abfd
)
455 struct gdbarch
*old_gdbarch
= current_gdbarch
;
456 struct gdbarch
*new_gdbarch
;
457 struct gdbarch_info info
;
459 /* If we call gdbarch_find_by_info without filling in info.abfd,
460 then it will use the global exec_bfd. That's fine if we don't
461 have one of those either. And that's the only time we should
462 reach here with a NULL ABFD argument - when we are discarding
464 gdb_assert (abfd
!= NULL
|| exec_bfd
== NULL
);
466 gdbarch_info_init (&info
);
468 return gdbarch_find_by_info (info
);
471 /* Set the dynamic target-system-dependent parameters (architecture,
472 byte-order) using information found in the BFD */
475 set_gdbarch_from_file (bfd
*abfd
)
477 struct gdbarch
*gdbarch
;
479 gdbarch
= gdbarch_from_bfd (abfd
);
481 error (_("Architecture of file not recognized."));
482 deprecated_current_gdbarch_select_hack (gdbarch
);
485 /* Initialize the current architecture. Update the ``set
486 architecture'' command so that it specifies a list of valid
489 #ifdef DEFAULT_BFD_ARCH
490 extern const bfd_arch_info_type DEFAULT_BFD_ARCH
;
491 static const bfd_arch_info_type
*default_bfd_arch
= &DEFAULT_BFD_ARCH
;
493 static const bfd_arch_info_type
*default_bfd_arch
;
496 #ifdef DEFAULT_BFD_VEC
497 extern const bfd_target DEFAULT_BFD_VEC
;
498 static const bfd_target
*default_bfd_vec
= &DEFAULT_BFD_VEC
;
500 static const bfd_target
*default_bfd_vec
;
503 static int default_byte_order
= BFD_ENDIAN_UNKNOWN
;
506 initialize_current_architecture (void)
508 const char **arches
= gdbarch_printable_names ();
510 /* determine a default architecture and byte order. */
511 struct gdbarch_info info
;
512 gdbarch_info_init (&info
);
514 /* Find a default architecture. */
515 if (default_bfd_arch
== NULL
)
517 /* Choose the architecture by taking the first one
519 const char *chosen
= arches
[0];
521 for (arch
= arches
; *arch
!= NULL
; arch
++)
523 if (strcmp (*arch
, chosen
) < 0)
527 internal_error (__FILE__
, __LINE__
,
528 _("initialize_current_architecture: No arch"));
529 default_bfd_arch
= bfd_scan_arch (chosen
);
530 if (default_bfd_arch
== NULL
)
531 internal_error (__FILE__
, __LINE__
,
532 _("initialize_current_architecture: Arch not found"));
535 info
.bfd_arch_info
= default_bfd_arch
;
537 /* Take several guesses at a byte order. */
538 if (default_byte_order
== BFD_ENDIAN_UNKNOWN
539 && default_bfd_vec
!= NULL
)
541 /* Extract BFD's default vector's byte order. */
542 switch (default_bfd_vec
->byteorder
)
545 default_byte_order
= BFD_ENDIAN_BIG
;
547 case BFD_ENDIAN_LITTLE
:
548 default_byte_order
= BFD_ENDIAN_LITTLE
;
554 if (default_byte_order
== BFD_ENDIAN_UNKNOWN
)
556 /* look for ``*el-*'' in the target name. */
558 chp
= strchr (target_name
, '-');
560 && chp
- 2 >= target_name
561 && strncmp (chp
- 2, "el", 2) == 0)
562 default_byte_order
= BFD_ENDIAN_LITTLE
;
564 if (default_byte_order
== BFD_ENDIAN_UNKNOWN
)
566 /* Wire it to big-endian!!! */
567 default_byte_order
= BFD_ENDIAN_BIG
;
570 info
.byte_order
= default_byte_order
;
572 if (! gdbarch_update_p (info
))
573 internal_error (__FILE__
, __LINE__
,
574 _("initialize_current_architecture: Selection of "
575 "initial architecture failed"));
577 /* Create the ``set architecture'' command appending ``auto'' to the
578 list of architectures. */
580 struct cmd_list_element
*c
;
581 /* Append ``auto''. */
583 for (nr
= 0; arches
[nr
] != NULL
; nr
++);
584 arches
= xrealloc (arches
, sizeof (char*) * (nr
+ 2));
585 arches
[nr
+ 0] = "auto";
586 arches
[nr
+ 1] = NULL
;
587 add_setshow_enum_cmd ("architecture", class_support
,
588 arches
, &set_architecture_string
, _("\
589 Set architecture of target."), _("\
590 Show architecture of target."), NULL
,
591 set_architecture
, show_architecture
,
592 &setlist
, &showlist
);
593 add_alias_cmd ("processor", "architecture", class_support
, 1, &setlist
);
598 /* Initialize a gdbarch info to values that will be automatically
599 overridden. Note: Originally, this ``struct info'' was initialized
600 using memset(0). Unfortunately, that ran into problems, namely
601 BFD_ENDIAN_BIG is zero. An explicit initialization function that
602 can explicitly set each field to a well defined value is used. */
605 gdbarch_info_init (struct gdbarch_info
*info
)
607 memset (info
, 0, sizeof (struct gdbarch_info
));
608 info
->byte_order
= BFD_ENDIAN_UNKNOWN
;
609 info
->osabi
= GDB_OSABI_UNINITIALIZED
;
612 /* Similar to init, but this time fill in the blanks. Information is
613 obtained from the global "set ..." options and explicitly
614 initialized INFO fields. */
617 gdbarch_info_fill (struct gdbarch_info
*info
)
619 /* Check for the current file. */
620 if (info
->abfd
== NULL
)
621 info
->abfd
= exec_bfd
;
622 if (info
->abfd
== NULL
)
623 info
->abfd
= core_bfd
;
625 /* Check for the current target description. */
626 if (info
->target_desc
== NULL
)
627 info
->target_desc
= target_current_description ();
629 /* "(gdb) set architecture ...". */
630 if (info
->bfd_arch_info
== NULL
631 && target_architecture_user
)
632 info
->bfd_arch_info
= target_architecture_user
;
634 if (info
->bfd_arch_info
== NULL
635 && info
->abfd
!= NULL
636 && bfd_get_arch (info
->abfd
) != bfd_arch_unknown
637 && bfd_get_arch (info
->abfd
) != bfd_arch_obscure
)
638 info
->bfd_arch_info
= bfd_get_arch_info (info
->abfd
);
639 /* From the target. */
640 if (info
->target_desc
!= NULL
)
641 info
->bfd_arch_info
= choose_architecture_for_target
642 (info
->bfd_arch_info
, tdesc_architecture (info
->target_desc
));
643 /* From the default. */
644 if (info
->bfd_arch_info
== NULL
)
645 info
->bfd_arch_info
= default_bfd_arch
;
647 /* "(gdb) set byte-order ...". */
648 if (info
->byte_order
== BFD_ENDIAN_UNKNOWN
649 && target_byte_order_user
!= BFD_ENDIAN_UNKNOWN
)
650 info
->byte_order
= target_byte_order_user
;
651 /* From the INFO struct. */
652 if (info
->byte_order
== BFD_ENDIAN_UNKNOWN
653 && info
->abfd
!= NULL
)
654 info
->byte_order
= (bfd_big_endian (info
->abfd
) ? BFD_ENDIAN_BIG
655 : bfd_little_endian (info
->abfd
) ? BFD_ENDIAN_LITTLE
656 : BFD_ENDIAN_UNKNOWN
);
657 /* From the default. */
658 if (info
->byte_order
== BFD_ENDIAN_UNKNOWN
)
659 info
->byte_order
= default_byte_order
;
661 /* "(gdb) set osabi ...". Handled by gdbarch_lookup_osabi. */
662 if (info
->osabi
== GDB_OSABI_UNINITIALIZED
)
663 info
->osabi
= gdbarch_lookup_osabi (info
->abfd
);
665 /* Must have at least filled in the architecture. */
666 gdb_assert (info
->bfd_arch_info
!= NULL
);
671 extern initialize_file_ftype _initialize_gdbarch_utils
; /* -Wmissing-prototypes */
674 _initialize_gdbarch_utils (void)
676 struct cmd_list_element
*c
;
677 add_setshow_enum_cmd ("endian", class_support
,
678 endian_enum
, &set_endian_string
, _("\
679 Set endianness of target."), _("\
680 Show endianness of target."), NULL
,
681 set_endian
, show_endian
,
682 &setlist
, &showlist
);