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 2 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, write to the Free Software
20 Foundation, Inc., 51 Franklin Street, Fifth Floor,
21 Boston, MA 02110-1301, USA. */
25 #include "arch-utils.h"
28 #include "inferior.h" /* enum CALL_DUMMY_LOCATION et.al. */
29 #include "gdb_string.h"
31 #include "gdb_assert.h"
32 #include "sim-regno.h"
35 #include "target-descriptions.h"
39 #include "floatformat.h"
42 always_use_struct_convention (int gcc_p
, struct type
*value_type
)
47 enum return_value_convention
48 legacy_return_value (struct gdbarch
*gdbarch
, struct type
*valtype
,
49 struct regcache
*regcache
, gdb_byte
*readbuf
,
50 const gdb_byte
*writebuf
)
52 /* NOTE: cagney/2004-06-13: The gcc_p parameter to
53 USE_STRUCT_CONVENTION isn't used. */
54 int struct_return
= ((TYPE_CODE (valtype
) == TYPE_CODE_STRUCT
55 || TYPE_CODE (valtype
) == TYPE_CODE_UNION
56 || TYPE_CODE (valtype
) == TYPE_CODE_ARRAY
)
57 && gdbarch_deprecated_use_struct_convention
58 (current_gdbarch
, 0, valtype
));
62 gdb_assert (!struct_return
);
63 /* NOTE: cagney/2004-06-13: See stack.c:return_command. Old
64 architectures don't expect store_return_value to handle small
65 structures. Should not be called with such types. */
66 gdb_assert (TYPE_CODE (valtype
) != TYPE_CODE_STRUCT
67 && TYPE_CODE (valtype
) != TYPE_CODE_UNION
);
68 gdbarch_store_return_value (current_gdbarch
, valtype
, regcache
, writebuf
);
73 gdb_assert (!struct_return
);
74 gdbarch_extract_return_value (current_gdbarch
,
75 valtype
, regcache
, readbuf
);
79 return RETURN_VALUE_STRUCT_CONVENTION
;
81 return RETURN_VALUE_REGISTER_CONVENTION
;
85 legacy_register_sim_regno (int regnum
)
87 /* Only makes sense to supply raw registers. */
88 gdb_assert (regnum
>= 0 && regnum
< gdbarch_num_regs (current_gdbarch
));
89 /* NOTE: cagney/2002-05-13: The old code did it this way and it is
90 suspected that some GDB/SIM combinations may rely on this
91 behavour. The default should be one2one_register_sim_regno
93 if (gdbarch_register_name (current_gdbarch
, regnum
) != NULL
94 && gdbarch_register_name (current_gdbarch
, regnum
)[0] != '\0')
97 return LEGACY_SIM_REGNO_IGNORE
;
101 generic_skip_trampoline_code (struct frame_info
*frame
, CORE_ADDR pc
)
107 generic_skip_solib_resolver (struct gdbarch
*gdbarch
, CORE_ADDR pc
)
113 generic_in_solib_return_trampoline (CORE_ADDR pc
, char *name
)
119 generic_in_function_epilogue_p (struct gdbarch
*gdbarch
, CORE_ADDR pc
)
124 /* Helper functions for gdbarch_inner_than */
127 core_addr_lessthan (CORE_ADDR lhs
, CORE_ADDR rhs
)
133 core_addr_greaterthan (CORE_ADDR lhs
, CORE_ADDR rhs
)
138 /* Misc helper functions for targets. */
141 core_addr_identity (CORE_ADDR addr
)
147 convert_from_func_ptr_addr_identity (struct gdbarch
*gdbarch
, CORE_ADDR addr
,
148 struct target_ops
*targ
)
154 no_op_reg_to_regnum (int reg
)
160 default_elf_make_msymbol_special (asymbol
*sym
, struct minimal_symbol
*msym
)
166 default_coff_make_msymbol_special (int val
, struct minimal_symbol
*msym
)
172 cannot_register_not (int regnum
)
177 /* Legacy version of target_virtual_frame_pointer(). Assumes that
178 there is an gdbarch_deprecated_fp_regnum and that it is the same, cooked or
182 legacy_virtual_frame_pointer (CORE_ADDR pc
,
184 LONGEST
*frame_offset
)
186 /* FIXME: cagney/2002-09-13: This code is used when identifying the
187 frame pointer of the current PC. It is assuming that a single
188 register and an offset can determine this. I think it should
189 instead generate a byte code expression as that would work better
190 with things like Dwarf2's CFI. */
191 if (gdbarch_deprecated_fp_regnum (current_gdbarch
) >= 0
192 && gdbarch_deprecated_fp_regnum (current_gdbarch
)
193 < gdbarch_num_regs (current_gdbarch
))
194 *frame_regnum
= gdbarch_deprecated_fp_regnum (current_gdbarch
);
195 else if (gdbarch_sp_regnum (current_gdbarch
) >= 0
196 && gdbarch_sp_regnum (current_gdbarch
)
197 < gdbarch_num_regs (current_gdbarch
))
198 *frame_regnum
= gdbarch_sp_regnum (current_gdbarch
);
200 /* Should this be an internal error? I guess so, it is reflecting
201 an architectural limitation in the current design. */
202 internal_error (__FILE__
, __LINE__
, _("No virtual frame pointer available"));
208 generic_convert_register_p (int regnum
, struct type
*type
)
214 default_stabs_argument_has_addr (struct gdbarch
*gdbarch
, struct type
*type
)
220 generic_instruction_nullified (struct gdbarch
*gdbarch
,
221 struct regcache
*regcache
)
227 default_remote_register_number (struct gdbarch
*gdbarch
,
234 /* Functions to manipulate the endianness of the target. */
236 static int target_byte_order_user
= BFD_ENDIAN_UNKNOWN
;
238 static const char endian_big
[] = "big";
239 static const char endian_little
[] = "little";
240 static const char endian_auto
[] = "auto";
241 static const char *endian_enum
[] =
248 static const char *set_endian_string
;
251 selected_byte_order (void)
253 if (target_byte_order_user
!= BFD_ENDIAN_UNKNOWN
)
254 return gdbarch_byte_order (current_gdbarch
);
256 return BFD_ENDIAN_UNKNOWN
;
259 /* Called by ``show endian''. */
262 show_endian (struct ui_file
*file
, int from_tty
, struct cmd_list_element
*c
,
265 if (target_byte_order_user
== BFD_ENDIAN_UNKNOWN
)
266 if (gdbarch_byte_order (current_gdbarch
) == BFD_ENDIAN_BIG
)
267 fprintf_unfiltered (file
, _("The target endianness is set automatically "
268 "(currently big endian)\n"));
270 fprintf_unfiltered (file
, _("The target endianness is set automatically "
271 "(currently little endian)\n"));
273 if (gdbarch_byte_order (current_gdbarch
) == BFD_ENDIAN_BIG
)
274 fprintf_unfiltered (file
,
275 _("The target is assumed to be big endian\n"));
277 fprintf_unfiltered (file
,
278 _("The target is assumed to be little endian\n"));
282 set_endian (char *ignore_args
, int from_tty
, struct cmd_list_element
*c
)
284 struct gdbarch_info info
;
286 gdbarch_info_init (&info
);
288 if (set_endian_string
== endian_auto
)
290 target_byte_order_user
= BFD_ENDIAN_UNKNOWN
;
291 if (! gdbarch_update_p (info
))
292 internal_error (__FILE__
, __LINE__
,
293 _("set_endian: architecture update failed"));
295 else if (set_endian_string
== endian_little
)
297 info
.byte_order
= BFD_ENDIAN_LITTLE
;
298 if (! gdbarch_update_p (info
))
299 printf_unfiltered (_("Little endian target not supported by GDB\n"));
301 target_byte_order_user
= BFD_ENDIAN_LITTLE
;
303 else if (set_endian_string
== endian_big
)
305 info
.byte_order
= BFD_ENDIAN_BIG
;
306 if (! gdbarch_update_p (info
))
307 printf_unfiltered (_("Big endian target not supported by GDB\n"));
309 target_byte_order_user
= BFD_ENDIAN_BIG
;
312 internal_error (__FILE__
, __LINE__
,
313 _("set_endian: bad value"));
315 show_endian (gdb_stdout
, from_tty
, NULL
, NULL
);
318 /* Given SELECTED, a currently selected BFD architecture, and
319 FROM_TARGET, a BFD architecture reported by the target description,
320 return what architecture to use. Either may be NULL; if both are
321 specified, we use the more specific. If the two are obviously
322 incompatible, warn the user. */
324 static const struct bfd_arch_info
*
325 choose_architecture_for_target (const struct bfd_arch_info
*selected
,
326 const struct bfd_arch_info
*from_target
)
328 const struct bfd_arch_info
*compat1
, *compat2
;
330 if (selected
== NULL
)
333 if (from_target
== NULL
)
336 /* struct bfd_arch_info objects are singletons: that is, there's
337 supposed to be exactly one instance for a given machine. So you
338 can tell whether two are equivalent by comparing pointers. */
339 if (from_target
== selected
)
342 /* BFD's 'A->compatible (A, B)' functions return zero if A and B are
343 incompatible. But if they are compatible, it returns the 'more
344 featureful' of the two arches. That is, if A can run code
345 written for B, but B can't run code written for A, then it'll
348 Some targets (e.g. MIPS as of 2006-12-04) don't fully
349 implement this, instead always returning NULL or the first
350 argument. We detect that case by checking both directions. */
352 compat1
= selected
->compatible (selected
, from_target
);
353 compat2
= from_target
->compatible (from_target
, selected
);
355 if (compat1
== NULL
&& compat2
== NULL
)
357 warning (_("Selected architecture %s is not compatible "
358 "with reported target architecture %s"),
359 selected
->printable_name
, from_target
->printable_name
);
367 if (compat1
== compat2
)
370 /* If the two didn't match, but one of them was a default architecture,
371 assume the more specific one is correct. This handles the case
372 where an executable or target description just says "mips", but
373 the other knows which MIPS variant. */
374 if (compat1
->the_default
)
376 if (compat2
->the_default
)
379 /* We have no idea which one is better. This is a bug, but not
380 a critical problem; warn the user. */
381 warning (_("Selected architecture %s is ambiguous with "
382 "reported target architecture %s"),
383 selected
->printable_name
, from_target
->printable_name
);
387 /* Functions to manipulate the architecture of the target */
389 enum set_arch
{ set_arch_auto
, set_arch_manual
};
391 static const struct bfd_arch_info
*target_architecture_user
;
393 static const char *set_architecture_string
;
396 selected_architecture_name (void)
398 if (target_architecture_user
== NULL
)
401 return set_architecture_string
;
404 /* Called if the user enters ``show architecture'' without an
408 show_architecture (struct ui_file
*file
, int from_tty
,
409 struct cmd_list_element
*c
, const char *value
)
412 arch
= gdbarch_bfd_arch_info (current_gdbarch
)->printable_name
;
413 if (target_architecture_user
== NULL
)
414 fprintf_filtered (file
, _("\
415 The target architecture is set automatically (currently %s)\n"), arch
);
417 fprintf_filtered (file
, _("\
418 The target architecture is assumed to be %s\n"), arch
);
422 /* Called if the user enters ``set architecture'' with or without an
426 set_architecture (char *ignore_args
, int from_tty
, struct cmd_list_element
*c
)
428 struct gdbarch_info info
;
430 gdbarch_info_init (&info
);
432 if (strcmp (set_architecture_string
, "auto") == 0)
434 target_architecture_user
= NULL
;
435 if (!gdbarch_update_p (info
))
436 internal_error (__FILE__
, __LINE__
,
437 _("could not select an architecture automatically"));
441 info
.bfd_arch_info
= bfd_scan_arch (set_architecture_string
);
442 if (info
.bfd_arch_info
== NULL
)
443 internal_error (__FILE__
, __LINE__
,
444 _("set_architecture: bfd_scan_arch failed"));
445 if (gdbarch_update_p (info
))
446 target_architecture_user
= info
.bfd_arch_info
;
448 printf_unfiltered (_("Architecture `%s' not recognized.\n"),
449 set_architecture_string
);
451 show_architecture (gdb_stdout
, from_tty
, NULL
, NULL
);
454 /* Try to select a global architecture that matches "info". Return
455 non-zero if the attempt succeds. */
457 gdbarch_update_p (struct gdbarch_info info
)
459 struct gdbarch
*new_gdbarch
= gdbarch_find_by_info (info
);
461 /* If there no architecture by that name, reject the request. */
462 if (new_gdbarch
== NULL
)
465 fprintf_unfiltered (gdb_stdlog
, "gdbarch_update_p: "
466 "Architecture not found\n");
470 /* If it is the same old architecture, accept the request (but don't
472 if (new_gdbarch
== current_gdbarch
)
475 fprintf_unfiltered (gdb_stdlog
, "gdbarch_update_p: "
476 "Architecture 0x%08lx (%s) unchanged\n",
478 gdbarch_bfd_arch_info (new_gdbarch
)->printable_name
);
482 /* It's a new architecture, swap it in. */
484 fprintf_unfiltered (gdb_stdlog
, "gdbarch_update_p: "
485 "New architecture 0x%08lx (%s) selected\n",
487 gdbarch_bfd_arch_info (new_gdbarch
)->printable_name
);
488 deprecated_current_gdbarch_select_hack (new_gdbarch
);
493 /* Return the architecture for ABFD. If no suitable architecture
494 could be find, return NULL. */
497 gdbarch_from_bfd (bfd
*abfd
)
499 struct gdbarch
*old_gdbarch
= current_gdbarch
;
500 struct gdbarch
*new_gdbarch
;
501 struct gdbarch_info info
;
503 /* If we call gdbarch_find_by_info without filling in info.abfd,
504 then it will use the global exec_bfd. That's fine if we don't
505 have one of those either. And that's the only time we should
506 reach here with a NULL ABFD argument - when we are discarding
508 gdb_assert (abfd
!= NULL
|| exec_bfd
== NULL
);
510 gdbarch_info_init (&info
);
512 return gdbarch_find_by_info (info
);
515 /* Set the dynamic target-system-dependent parameters (architecture,
516 byte-order) using information found in the BFD */
519 set_gdbarch_from_file (bfd
*abfd
)
521 struct gdbarch
*gdbarch
;
523 gdbarch
= gdbarch_from_bfd (abfd
);
525 error (_("Architecture of file not recognized."));
526 deprecated_current_gdbarch_select_hack (gdbarch
);
529 /* Initialize the current architecture. Update the ``set
530 architecture'' command so that it specifies a list of valid
533 #ifdef DEFAULT_BFD_ARCH
534 extern const bfd_arch_info_type DEFAULT_BFD_ARCH
;
535 static const bfd_arch_info_type
*default_bfd_arch
= &DEFAULT_BFD_ARCH
;
537 static const bfd_arch_info_type
*default_bfd_arch
;
540 #ifdef DEFAULT_BFD_VEC
541 extern const bfd_target DEFAULT_BFD_VEC
;
542 static const bfd_target
*default_bfd_vec
= &DEFAULT_BFD_VEC
;
544 static const bfd_target
*default_bfd_vec
;
547 static int default_byte_order
= BFD_ENDIAN_UNKNOWN
;
550 initialize_current_architecture (void)
552 const char **arches
= gdbarch_printable_names ();
554 /* determine a default architecture and byte order. */
555 struct gdbarch_info info
;
556 gdbarch_info_init (&info
);
558 /* Find a default architecture. */
559 if (default_bfd_arch
== NULL
)
561 /* Choose the architecture by taking the first one
563 const char *chosen
= arches
[0];
565 for (arch
= arches
; *arch
!= NULL
; arch
++)
567 if (strcmp (*arch
, chosen
) < 0)
571 internal_error (__FILE__
, __LINE__
,
572 _("initialize_current_architecture: No arch"));
573 default_bfd_arch
= bfd_scan_arch (chosen
);
574 if (default_bfd_arch
== NULL
)
575 internal_error (__FILE__
, __LINE__
,
576 _("initialize_current_architecture: Arch not found"));
579 info
.bfd_arch_info
= default_bfd_arch
;
581 /* Take several guesses at a byte order. */
582 if (default_byte_order
== BFD_ENDIAN_UNKNOWN
583 && default_bfd_vec
!= NULL
)
585 /* Extract BFD's default vector's byte order. */
586 switch (default_bfd_vec
->byteorder
)
589 default_byte_order
= BFD_ENDIAN_BIG
;
591 case BFD_ENDIAN_LITTLE
:
592 default_byte_order
= BFD_ENDIAN_LITTLE
;
598 if (default_byte_order
== BFD_ENDIAN_UNKNOWN
)
600 /* look for ``*el-*'' in the target name. */
602 chp
= strchr (target_name
, '-');
604 && chp
- 2 >= target_name
605 && strncmp (chp
- 2, "el", 2) == 0)
606 default_byte_order
= BFD_ENDIAN_LITTLE
;
608 if (default_byte_order
== BFD_ENDIAN_UNKNOWN
)
610 /* Wire it to big-endian!!! */
611 default_byte_order
= BFD_ENDIAN_BIG
;
614 info
.byte_order
= default_byte_order
;
616 if (! gdbarch_update_p (info
))
617 internal_error (__FILE__
, __LINE__
,
618 _("initialize_current_architecture: Selection of "
619 "initial architecture failed"));
621 /* Create the ``set architecture'' command appending ``auto'' to the
622 list of architectures. */
624 struct cmd_list_element
*c
;
625 /* Append ``auto''. */
627 for (nr
= 0; arches
[nr
] != NULL
; nr
++);
628 arches
= xrealloc (arches
, sizeof (char*) * (nr
+ 2));
629 arches
[nr
+ 0] = "auto";
630 arches
[nr
+ 1] = NULL
;
631 add_setshow_enum_cmd ("architecture", class_support
,
632 arches
, &set_architecture_string
, _("\
633 Set architecture of target."), _("\
634 Show architecture of target."), NULL
,
635 set_architecture
, show_architecture
,
636 &setlist
, &showlist
);
637 add_alias_cmd ("processor", "architecture", class_support
, 1, &setlist
);
642 /* Initialize a gdbarch info to values that will be automatically
643 overridden. Note: Originally, this ``struct info'' was initialized
644 using memset(0). Unfortunately, that ran into problems, namely
645 BFD_ENDIAN_BIG is zero. An explicit initialization function that
646 can explicitly set each field to a well defined value is used. */
649 gdbarch_info_init (struct gdbarch_info
*info
)
651 memset (info
, 0, sizeof (struct gdbarch_info
));
652 info
->byte_order
= BFD_ENDIAN_UNKNOWN
;
653 info
->osabi
= GDB_OSABI_UNINITIALIZED
;
656 /* Similar to init, but this time fill in the blanks. Information is
657 obtained from the global "set ..." options and explicitly
658 initialized INFO fields. */
661 gdbarch_info_fill (struct gdbarch_info
*info
)
663 /* Check for the current file. */
664 if (info
->abfd
== NULL
)
665 info
->abfd
= exec_bfd
;
667 /* Check for the current target description. */
668 if (info
->target_desc
== NULL
)
669 info
->target_desc
= target_current_description ();
671 /* "(gdb) set architecture ...". */
672 if (info
->bfd_arch_info
== NULL
673 && target_architecture_user
)
674 info
->bfd_arch_info
= target_architecture_user
;
676 if (info
->bfd_arch_info
== NULL
677 && info
->abfd
!= NULL
678 && bfd_get_arch (info
->abfd
) != bfd_arch_unknown
679 && bfd_get_arch (info
->abfd
) != bfd_arch_obscure
)
680 info
->bfd_arch_info
= bfd_get_arch_info (info
->abfd
);
681 /* From the target. */
682 if (info
->target_desc
!= NULL
)
683 info
->bfd_arch_info
= choose_architecture_for_target
684 (info
->bfd_arch_info
, tdesc_architecture (info
->target_desc
));
685 /* From the default. */
686 if (info
->bfd_arch_info
== NULL
)
687 info
->bfd_arch_info
= default_bfd_arch
;
689 /* "(gdb) set byte-order ...". */
690 if (info
->byte_order
== BFD_ENDIAN_UNKNOWN
691 && target_byte_order_user
!= BFD_ENDIAN_UNKNOWN
)
692 info
->byte_order
= target_byte_order_user
;
693 /* From the INFO struct. */
694 if (info
->byte_order
== BFD_ENDIAN_UNKNOWN
695 && info
->abfd
!= NULL
)
696 info
->byte_order
= (bfd_big_endian (info
->abfd
) ? BFD_ENDIAN_BIG
697 : bfd_little_endian (info
->abfd
) ? BFD_ENDIAN_LITTLE
698 : BFD_ENDIAN_UNKNOWN
);
699 /* From the default. */
700 if (info
->byte_order
== BFD_ENDIAN_UNKNOWN
)
701 info
->byte_order
= default_byte_order
;
703 /* "(gdb) set osabi ...". Handled by gdbarch_lookup_osabi. */
704 if (info
->osabi
== GDB_OSABI_UNINITIALIZED
)
705 info
->osabi
= gdbarch_lookup_osabi (info
->abfd
);
707 /* Must have at least filled in the architecture. */
708 gdb_assert (info
->bfd_arch_info
!= NULL
);
713 extern initialize_file_ftype _initialize_gdbarch_utils
; /* -Wmissing-prototypes */
716 _initialize_gdbarch_utils (void)
718 struct cmd_list_element
*c
;
719 add_setshow_enum_cmd ("endian", class_support
,
720 endian_enum
, &set_endian_string
, _("\
721 Set endianness of target."), _("\
722 Show endianness of target."), NULL
,
723 set_endian
, show_endian
,
724 &setlist
, &showlist
);