1 /* Dynamic architecture support for GDB, the GNU debugger.
3 Copyright (C) 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007,
4 2008, 2009 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"
38 #include "floatformat.h"
41 struct displaced_step_closure
*
42 simple_displaced_step_copy_insn (struct gdbarch
*gdbarch
,
43 CORE_ADDR from
, CORE_ADDR to
,
44 struct regcache
*regs
)
46 size_t len
= gdbarch_max_insn_length (gdbarch
);
47 gdb_byte
*buf
= xmalloc (len
);
49 read_memory (from
, buf
, len
);
50 write_memory (to
, buf
, len
);
54 fprintf_unfiltered (gdb_stdlog
, "displaced: copy %s->%s: ",
55 paddress (gdbarch
, from
), paddress (gdbarch
, to
));
56 displaced_step_dump_bytes (gdb_stdlog
, buf
, len
);
59 return (struct displaced_step_closure
*) buf
;
64 simple_displaced_step_free_closure (struct gdbarch
*gdbarch
,
65 struct displaced_step_closure
*closure
)
72 displaced_step_at_entry_point (struct gdbarch
*gdbarch
)
77 addr
= entry_point_address ();
79 /* Inferior calls also use the entry point as a breakpoint location.
80 We don't want displaced stepping to interfere with those
81 breakpoints, so leave space. */
82 gdbarch_breakpoint_from_pc (gdbarch
, &addr
, &bp_len
);
89 legacy_register_sim_regno (struct gdbarch
*gdbarch
, int regnum
)
91 /* Only makes sense to supply raw registers. */
92 gdb_assert (regnum
>= 0 && regnum
< gdbarch_num_regs (gdbarch
));
93 /* NOTE: cagney/2002-05-13: The old code did it this way and it is
94 suspected that some GDB/SIM combinations may rely on this
95 behavour. The default should be one2one_register_sim_regno
97 if (gdbarch_register_name (gdbarch
, regnum
) != NULL
98 && gdbarch_register_name (gdbarch
, regnum
)[0] != '\0')
101 return LEGACY_SIM_REGNO_IGNORE
;
105 generic_skip_trampoline_code (struct frame_info
*frame
, CORE_ADDR pc
)
111 generic_skip_solib_resolver (struct gdbarch
*gdbarch
, CORE_ADDR pc
)
117 generic_in_solib_return_trampoline (struct gdbarch
*gdbarch
,
118 CORE_ADDR pc
, char *name
)
124 generic_in_function_epilogue_p (struct gdbarch
*gdbarch
, CORE_ADDR pc
)
129 /* Helper functions for gdbarch_inner_than */
132 core_addr_lessthan (CORE_ADDR lhs
, CORE_ADDR rhs
)
138 core_addr_greaterthan (CORE_ADDR lhs
, CORE_ADDR rhs
)
143 /* Misc helper functions for targets. */
146 core_addr_identity (struct gdbarch
*gdbarch
, CORE_ADDR addr
)
152 convert_from_func_ptr_addr_identity (struct gdbarch
*gdbarch
, CORE_ADDR addr
,
153 struct target_ops
*targ
)
159 no_op_reg_to_regnum (struct gdbarch
*gdbarch
, int reg
)
165 default_elf_make_msymbol_special (asymbol
*sym
, struct minimal_symbol
*msym
)
171 default_coff_make_msymbol_special (int val
, struct minimal_symbol
*msym
)
177 cannot_register_not (struct gdbarch
*gdbarch
, int regnum
)
182 /* Legacy version of target_virtual_frame_pointer(). Assumes that
183 there is an gdbarch_deprecated_fp_regnum and that it is the same, cooked or
187 legacy_virtual_frame_pointer (struct gdbarch
*gdbarch
,
190 LONGEST
*frame_offset
)
192 /* FIXME: cagney/2002-09-13: This code is used when identifying the
193 frame pointer of the current PC. It is assuming that a single
194 register and an offset can determine this. I think it should
195 instead generate a byte code expression as that would work better
196 with things like Dwarf2's CFI. */
197 if (gdbarch_deprecated_fp_regnum (gdbarch
) >= 0
198 && gdbarch_deprecated_fp_regnum (gdbarch
)
199 < gdbarch_num_regs (gdbarch
))
200 *frame_regnum
= gdbarch_deprecated_fp_regnum (gdbarch
);
201 else if (gdbarch_sp_regnum (gdbarch
) >= 0
202 && gdbarch_sp_regnum (gdbarch
)
203 < gdbarch_num_regs (gdbarch
))
204 *frame_regnum
= gdbarch_sp_regnum (gdbarch
);
206 /* Should this be an internal error? I guess so, it is reflecting
207 an architectural limitation in the current design. */
208 internal_error (__FILE__
, __LINE__
, _("No virtual frame pointer available"));
214 generic_convert_register_p (struct gdbarch
*gdbarch
, int regnum
,
221 default_stabs_argument_has_addr (struct gdbarch
*gdbarch
, struct type
*type
)
227 generic_instruction_nullified (struct gdbarch
*gdbarch
,
228 struct regcache
*regcache
)
234 default_remote_register_number (struct gdbarch
*gdbarch
,
241 /* Functions to manipulate the endianness of the target. */
243 static int target_byte_order_user
= BFD_ENDIAN_UNKNOWN
;
245 static const char endian_big
[] = "big";
246 static const char endian_little
[] = "little";
247 static const char endian_auto
[] = "auto";
248 static const char *endian_enum
[] =
255 static const char *set_endian_string
;
258 selected_byte_order (void)
260 return target_byte_order_user
;
263 /* Called by ``show endian''. */
266 show_endian (struct ui_file
*file
, int from_tty
, struct cmd_list_element
*c
,
269 if (target_byte_order_user
== BFD_ENDIAN_UNKNOWN
)
270 if (gdbarch_byte_order (get_current_arch ()) == BFD_ENDIAN_BIG
)
271 fprintf_unfiltered (file
, _("The target endianness is set automatically "
272 "(currently big endian)\n"));
274 fprintf_unfiltered (file
, _("The target endianness is set automatically "
275 "(currently little endian)\n"));
277 if (target_byte_order_user
== BFD_ENDIAN_BIG
)
278 fprintf_unfiltered (file
,
279 _("The target is assumed to be big endian\n"));
281 fprintf_unfiltered (file
,
282 _("The target is assumed to be little endian\n"));
286 set_endian (char *ignore_args
, int from_tty
, struct cmd_list_element
*c
)
288 struct gdbarch_info info
;
290 gdbarch_info_init (&info
);
292 if (set_endian_string
== endian_auto
)
294 target_byte_order_user
= BFD_ENDIAN_UNKNOWN
;
295 if (! gdbarch_update_p (info
))
296 internal_error (__FILE__
, __LINE__
,
297 _("set_endian: architecture update failed"));
299 else if (set_endian_string
== endian_little
)
301 info
.byte_order
= BFD_ENDIAN_LITTLE
;
302 if (! gdbarch_update_p (info
))
303 printf_unfiltered (_("Little endian target not supported by GDB\n"));
305 target_byte_order_user
= BFD_ENDIAN_LITTLE
;
307 else if (set_endian_string
== endian_big
)
309 info
.byte_order
= BFD_ENDIAN_BIG
;
310 if (! gdbarch_update_p (info
))
311 printf_unfiltered (_("Big endian target not supported by GDB\n"));
313 target_byte_order_user
= BFD_ENDIAN_BIG
;
316 internal_error (__FILE__
, __LINE__
,
317 _("set_endian: bad value"));
319 show_endian (gdb_stdout
, from_tty
, NULL
, NULL
);
322 /* Given SELECTED, a currently selected BFD architecture, and
323 TARGET_DESC, the current target description, return what
326 SELECTED may be NULL, in which case we return the architecture
327 associated with TARGET_DESC. If SELECTED specifies a variant
328 of the architecture associtated with TARGET_DESC, return the
329 more specific of the two.
331 If SELECTED is a different architecture, but it is accepted as
332 compatible by the target, we can use the target architecture.
334 If SELECTED is obviously incompatible, warn the user. */
336 static const struct bfd_arch_info
*
337 choose_architecture_for_target (const struct target_desc
*target_desc
,
338 const struct bfd_arch_info
*selected
)
340 const struct bfd_arch_info
*from_target
= tdesc_architecture (target_desc
);
341 const struct bfd_arch_info
*compat1
, *compat2
;
343 if (selected
== NULL
)
346 if (from_target
== NULL
)
349 /* struct bfd_arch_info objects are singletons: that is, there's
350 supposed to be exactly one instance for a given machine. So you
351 can tell whether two are equivalent by comparing pointers. */
352 if (from_target
== selected
)
355 /* BFD's 'A->compatible (A, B)' functions return zero if A and B are
356 incompatible. But if they are compatible, it returns the 'more
357 featureful' of the two arches. That is, if A can run code
358 written for B, but B can't run code written for A, then it'll
361 Some targets (e.g. MIPS as of 2006-12-04) don't fully
362 implement this, instead always returning NULL or the first
363 argument. We detect that case by checking both directions. */
365 compat1
= selected
->compatible (selected
, from_target
);
366 compat2
= from_target
->compatible (from_target
, selected
);
368 if (compat1
== NULL
&& compat2
== NULL
)
370 /* BFD considers the architectures incompatible. Check our target
371 description whether it accepts SELECTED as compatible anyway. */
372 if (tdesc_compatible_p (target_desc
, selected
))
375 warning (_("Selected architecture %s is not compatible "
376 "with reported target architecture %s"),
377 selected
->printable_name
, from_target
->printable_name
);
385 if (compat1
== compat2
)
388 /* If the two didn't match, but one of them was a default architecture,
389 assume the more specific one is correct. This handles the case
390 where an executable or target description just says "mips", but
391 the other knows which MIPS variant. */
392 if (compat1
->the_default
)
394 if (compat2
->the_default
)
397 /* We have no idea which one is better. This is a bug, but not
398 a critical problem; warn the user. */
399 warning (_("Selected architecture %s is ambiguous with "
400 "reported target architecture %s"),
401 selected
->printable_name
, from_target
->printable_name
);
405 /* Functions to manipulate the architecture of the target */
407 enum set_arch
{ set_arch_auto
, set_arch_manual
};
409 static const struct bfd_arch_info
*target_architecture_user
;
411 static const char *set_architecture_string
;
414 selected_architecture_name (void)
416 if (target_architecture_user
== NULL
)
419 return set_architecture_string
;
422 /* Called if the user enters ``show architecture'' without an
426 show_architecture (struct ui_file
*file
, int from_tty
,
427 struct cmd_list_element
*c
, const char *value
)
429 if (target_architecture_user
== NULL
)
430 fprintf_filtered (file
, _("\
431 The target architecture is set automatically (currently %s)\n"),
432 gdbarch_bfd_arch_info (get_current_arch ())->printable_name
);
434 fprintf_filtered (file
, _("\
435 The target architecture is assumed to be %s\n"), set_architecture_string
);
439 /* Called if the user enters ``set architecture'' with or without an
443 set_architecture (char *ignore_args
, int from_tty
, struct cmd_list_element
*c
)
445 struct gdbarch_info info
;
447 gdbarch_info_init (&info
);
449 if (strcmp (set_architecture_string
, "auto") == 0)
451 target_architecture_user
= NULL
;
452 if (!gdbarch_update_p (info
))
453 internal_error (__FILE__
, __LINE__
,
454 _("could not select an architecture automatically"));
458 info
.bfd_arch_info
= bfd_scan_arch (set_architecture_string
);
459 if (info
.bfd_arch_info
== NULL
)
460 internal_error (__FILE__
, __LINE__
,
461 _("set_architecture: bfd_scan_arch failed"));
462 if (gdbarch_update_p (info
))
463 target_architecture_user
= info
.bfd_arch_info
;
465 printf_unfiltered (_("Architecture `%s' not recognized.\n"),
466 set_architecture_string
);
468 show_architecture (gdb_stdout
, from_tty
, NULL
, NULL
);
471 /* Try to select a global architecture that matches "info". Return
472 non-zero if the attempt succeds. */
474 gdbarch_update_p (struct gdbarch_info info
)
476 struct gdbarch
*new_gdbarch
;
478 /* Check for the current file. */
479 if (info
.abfd
== NULL
)
480 info
.abfd
= exec_bfd
;
481 if (info
.abfd
== NULL
)
482 info
.abfd
= core_bfd
;
484 /* Check for the current target description. */
485 if (info
.target_desc
== NULL
)
486 info
.target_desc
= target_current_description ();
488 new_gdbarch
= gdbarch_find_by_info (info
);
490 /* If there no architecture by that name, reject the request. */
491 if (new_gdbarch
== NULL
)
494 fprintf_unfiltered (gdb_stdlog
, "gdbarch_update_p: "
495 "Architecture not found\n");
499 /* If it is the same old architecture, accept the request (but don't
501 if (new_gdbarch
== target_gdbarch
)
504 fprintf_unfiltered (gdb_stdlog
, "gdbarch_update_p: "
505 "Architecture %s (%s) unchanged\n",
506 host_address_to_string (new_gdbarch
),
507 gdbarch_bfd_arch_info (new_gdbarch
)->printable_name
);
511 /* It's a new architecture, swap it in. */
513 fprintf_unfiltered (gdb_stdlog
, "gdbarch_update_p: "
514 "New architecture %s (%s) selected\n",
515 host_address_to_string (new_gdbarch
),
516 gdbarch_bfd_arch_info (new_gdbarch
)->printable_name
);
517 deprecated_target_gdbarch_select_hack (new_gdbarch
);
522 /* Return the architecture for ABFD. If no suitable architecture
523 could be find, return NULL. */
526 gdbarch_from_bfd (bfd
*abfd
)
528 struct gdbarch_info info
;
529 gdbarch_info_init (&info
);
531 return gdbarch_find_by_info (info
);
534 /* Set the dynamic target-system-dependent parameters (architecture,
535 byte-order) using information found in the BFD */
538 set_gdbarch_from_file (bfd
*abfd
)
540 struct gdbarch_info info
;
541 struct gdbarch
*gdbarch
;
543 gdbarch_info_init (&info
);
545 info
.target_desc
= target_current_description ();
546 gdbarch
= gdbarch_find_by_info (info
);
549 error (_("Architecture of file not recognized."));
550 deprecated_target_gdbarch_select_hack (gdbarch
);
553 /* Initialize the current architecture. Update the ``set
554 architecture'' command so that it specifies a list of valid
557 #ifdef DEFAULT_BFD_ARCH
558 extern const bfd_arch_info_type DEFAULT_BFD_ARCH
;
559 static const bfd_arch_info_type
*default_bfd_arch
= &DEFAULT_BFD_ARCH
;
561 static const bfd_arch_info_type
*default_bfd_arch
;
564 #ifdef DEFAULT_BFD_VEC
565 extern const bfd_target DEFAULT_BFD_VEC
;
566 static const bfd_target
*default_bfd_vec
= &DEFAULT_BFD_VEC
;
568 static const bfd_target
*default_bfd_vec
;
571 static int default_byte_order
= BFD_ENDIAN_UNKNOWN
;
574 initialize_current_architecture (void)
576 const char **arches
= gdbarch_printable_names ();
578 /* determine a default architecture and byte order. */
579 struct gdbarch_info info
;
580 gdbarch_info_init (&info
);
582 /* Find a default architecture. */
583 if (default_bfd_arch
== NULL
)
585 /* Choose the architecture by taking the first one
587 const char *chosen
= arches
[0];
589 for (arch
= arches
; *arch
!= NULL
; arch
++)
591 if (strcmp (*arch
, chosen
) < 0)
595 internal_error (__FILE__
, __LINE__
,
596 _("initialize_current_architecture: No arch"));
597 default_bfd_arch
= bfd_scan_arch (chosen
);
598 if (default_bfd_arch
== NULL
)
599 internal_error (__FILE__
, __LINE__
,
600 _("initialize_current_architecture: Arch not found"));
603 info
.bfd_arch_info
= default_bfd_arch
;
605 /* Take several guesses at a byte order. */
606 if (default_byte_order
== BFD_ENDIAN_UNKNOWN
607 && default_bfd_vec
!= NULL
)
609 /* Extract BFD's default vector's byte order. */
610 switch (default_bfd_vec
->byteorder
)
613 default_byte_order
= BFD_ENDIAN_BIG
;
615 case BFD_ENDIAN_LITTLE
:
616 default_byte_order
= BFD_ENDIAN_LITTLE
;
622 if (default_byte_order
== BFD_ENDIAN_UNKNOWN
)
624 /* look for ``*el-*'' in the target name. */
626 chp
= strchr (target_name
, '-');
628 && chp
- 2 >= target_name
629 && strncmp (chp
- 2, "el", 2) == 0)
630 default_byte_order
= BFD_ENDIAN_LITTLE
;
632 if (default_byte_order
== BFD_ENDIAN_UNKNOWN
)
634 /* Wire it to big-endian!!! */
635 default_byte_order
= BFD_ENDIAN_BIG
;
638 info
.byte_order
= default_byte_order
;
639 info
.byte_order_for_code
= info
.byte_order
;
641 if (! gdbarch_update_p (info
))
642 internal_error (__FILE__
, __LINE__
,
643 _("initialize_current_architecture: Selection of "
644 "initial architecture failed"));
646 /* Create the ``set architecture'' command appending ``auto'' to the
647 list of architectures. */
649 struct cmd_list_element
*c
;
650 /* Append ``auto''. */
652 for (nr
= 0; arches
[nr
] != NULL
; nr
++);
653 arches
= xrealloc (arches
, sizeof (char*) * (nr
+ 2));
654 arches
[nr
+ 0] = "auto";
655 arches
[nr
+ 1] = NULL
;
656 add_setshow_enum_cmd ("architecture", class_support
,
657 arches
, &set_architecture_string
, _("\
658 Set architecture of target."), _("\
659 Show architecture of target."), NULL
,
660 set_architecture
, show_architecture
,
661 &setlist
, &showlist
);
662 add_alias_cmd ("processor", "architecture", class_support
, 1, &setlist
);
667 /* Initialize a gdbarch info to values that will be automatically
668 overridden. Note: Originally, this ``struct info'' was initialized
669 using memset(0). Unfortunately, that ran into problems, namely
670 BFD_ENDIAN_BIG is zero. An explicit initialization function that
671 can explicitly set each field to a well defined value is used. */
674 gdbarch_info_init (struct gdbarch_info
*info
)
676 memset (info
, 0, sizeof (struct gdbarch_info
));
677 info
->byte_order
= BFD_ENDIAN_UNKNOWN
;
678 info
->byte_order_for_code
= info
->byte_order
;
679 info
->osabi
= GDB_OSABI_UNINITIALIZED
;
682 /* Similar to init, but this time fill in the blanks. Information is
683 obtained from the global "set ..." options and explicitly
684 initialized INFO fields. */
687 gdbarch_info_fill (struct gdbarch_info
*info
)
689 /* "(gdb) set architecture ...". */
690 if (info
->bfd_arch_info
== NULL
691 && target_architecture_user
)
692 info
->bfd_arch_info
= target_architecture_user
;
694 if (info
->bfd_arch_info
== NULL
695 && info
->abfd
!= NULL
696 && bfd_get_arch (info
->abfd
) != bfd_arch_unknown
697 && bfd_get_arch (info
->abfd
) != bfd_arch_obscure
)
698 info
->bfd_arch_info
= bfd_get_arch_info (info
->abfd
);
699 /* From the target. */
700 if (info
->target_desc
!= NULL
)
701 info
->bfd_arch_info
= choose_architecture_for_target
702 (info
->target_desc
, info
->bfd_arch_info
);
703 /* From the default. */
704 if (info
->bfd_arch_info
== NULL
)
705 info
->bfd_arch_info
= default_bfd_arch
;
707 /* "(gdb) set byte-order ...". */
708 if (info
->byte_order
== BFD_ENDIAN_UNKNOWN
709 && target_byte_order_user
!= BFD_ENDIAN_UNKNOWN
)
710 info
->byte_order
= target_byte_order_user
;
711 /* From the INFO struct. */
712 if (info
->byte_order
== BFD_ENDIAN_UNKNOWN
713 && info
->abfd
!= NULL
)
714 info
->byte_order
= (bfd_big_endian (info
->abfd
) ? BFD_ENDIAN_BIG
715 : bfd_little_endian (info
->abfd
) ? BFD_ENDIAN_LITTLE
716 : BFD_ENDIAN_UNKNOWN
);
717 /* From the default. */
718 if (info
->byte_order
== BFD_ENDIAN_UNKNOWN
)
719 info
->byte_order
= default_byte_order
;
720 info
->byte_order_for_code
= info
->byte_order
;
722 /* "(gdb) set osabi ...". Handled by gdbarch_lookup_osabi. */
723 /* From the manual override, or from file. */
724 if (info
->osabi
== GDB_OSABI_UNINITIALIZED
)
725 info
->osabi
= gdbarch_lookup_osabi (info
->abfd
);
726 /* From the target. */
727 if (info
->osabi
== GDB_OSABI_UNKNOWN
&& info
->target_desc
!= NULL
)
728 info
->osabi
= tdesc_osabi (info
->target_desc
);
729 /* From the configured default. */
730 #ifdef GDB_OSABI_DEFAULT
731 if (info
->osabi
== GDB_OSABI_UNKNOWN
)
732 info
->osabi
= GDB_OSABI_DEFAULT
;
735 /* Must have at least filled in the architecture. */
736 gdb_assert (info
->bfd_arch_info
!= NULL
);
739 /* Return "current" architecture. If the target is running, this is the
740 architecture of the selected frame. Otherwise, the "current" architecture
741 defaults to the target architecture.
743 This function should normally be called solely by the command interpreter
744 routines to determine the architecture to execute a command in. */
746 get_current_arch (void)
748 if (has_stack_frames ())
749 return get_frame_arch (get_selected_frame (NULL
));
751 return target_gdbarch
;
756 extern initialize_file_ftype _initialize_gdbarch_utils
; /* -Wmissing-prototypes */
759 _initialize_gdbarch_utils (void)
761 struct cmd_list_element
*c
;
762 add_setshow_enum_cmd ("endian", class_support
,
763 endian_enum
, &set_endian_string
, _("\
764 Set endianness of target."), _("\
765 Show endianness of target."), NULL
,
766 set_endian
, show_endian
,
767 &setlist
, &showlist
);