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 && DEPRECATED_USE_STRUCT_CONVENTION (0, valtype
));
61 gdb_assert (!struct_return
);
62 /* NOTE: cagney/2004-06-13: See stack.c:return_command. Old
63 architectures don't expect STORE_RETURN_VALUE to handle small
64 structures. Should not be called with such types. */
65 gdb_assert (TYPE_CODE (valtype
) != TYPE_CODE_STRUCT
66 && TYPE_CODE (valtype
) != TYPE_CODE_UNION
);
67 STORE_RETURN_VALUE (valtype
, regcache
, writebuf
);
72 gdb_assert (!struct_return
);
73 EXTRACT_RETURN_VALUE (valtype
, regcache
, readbuf
);
77 return RETURN_VALUE_STRUCT_CONVENTION
;
79 return RETURN_VALUE_REGISTER_CONVENTION
;
83 legacy_register_sim_regno (int regnum
)
85 /* Only makes sense to supply raw registers. */
86 gdb_assert (regnum
>= 0 && regnum
< gdbarch_num_regs (current_gdbarch
));
87 /* NOTE: cagney/2002-05-13: The old code did it this way and it is
88 suspected that some GDB/SIM combinations may rely on this
89 behavour. The default should be one2one_register_sim_regno
91 if (REGISTER_NAME (regnum
) != NULL
92 && REGISTER_NAME (regnum
)[0] != '\0')
95 return LEGACY_SIM_REGNO_IGNORE
;
99 generic_skip_trampoline_code (CORE_ADDR pc
)
105 generic_skip_solib_resolver (struct gdbarch
*gdbarch
, CORE_ADDR pc
)
111 generic_in_solib_return_trampoline (CORE_ADDR pc
, char *name
)
117 generic_in_function_epilogue_p (struct gdbarch
*gdbarch
, CORE_ADDR pc
)
122 /* Helper functions for gdbarch_inner_than */
125 core_addr_lessthan (CORE_ADDR lhs
, CORE_ADDR rhs
)
131 core_addr_greaterthan (CORE_ADDR lhs
, CORE_ADDR rhs
)
136 /* Misc helper functions for targets. */
139 core_addr_identity (CORE_ADDR addr
)
145 convert_from_func_ptr_addr_identity (struct gdbarch
*gdbarch
, CORE_ADDR addr
,
146 struct target_ops
*targ
)
152 no_op_reg_to_regnum (int reg
)
158 default_elf_make_msymbol_special (asymbol
*sym
, struct minimal_symbol
*msym
)
164 default_coff_make_msymbol_special (int val
, struct minimal_symbol
*msym
)
170 cannot_register_not (int regnum
)
175 /* Legacy version of target_virtual_frame_pointer(). Assumes that
176 there is an DEPRECATED_FP_REGNUM and that it is the same, cooked or
180 legacy_virtual_frame_pointer (CORE_ADDR pc
,
182 LONGEST
*frame_offset
)
184 /* FIXME: cagney/2002-09-13: This code is used when identifying the
185 frame pointer of the current PC. It is assuming that a single
186 register and an offset can determine this. I think it should
187 instead generate a byte code expression as that would work better
188 with things like Dwarf2's CFI. */
189 if (DEPRECATED_FP_REGNUM
>= 0
190 && DEPRECATED_FP_REGNUM
< gdbarch_num_regs (current_gdbarch
))
191 *frame_regnum
= DEPRECATED_FP_REGNUM
;
192 else if (SP_REGNUM
>= 0 && SP_REGNUM
< gdbarch_num_regs (current_gdbarch
))
193 *frame_regnum
= SP_REGNUM
;
195 /* Should this be an internal error? I guess so, it is reflecting
196 an architectural limitation in the current design. */
197 internal_error (__FILE__
, __LINE__
, _("No virtual frame pointer available"));
203 generic_convert_register_p (int regnum
, struct type
*type
)
209 default_stabs_argument_has_addr (struct gdbarch
*gdbarch
, struct type
*type
)
215 generic_instruction_nullified (struct gdbarch
*gdbarch
,
216 struct regcache
*regcache
)
222 default_remote_register_number (struct gdbarch
*gdbarch
,
229 /* Functions to manipulate the endianness of the target. */
231 static int target_byte_order_user
= BFD_ENDIAN_UNKNOWN
;
233 static const char endian_big
[] = "big";
234 static const char endian_little
[] = "little";
235 static const char endian_auto
[] = "auto";
236 static const char *endian_enum
[] =
243 static const char *set_endian_string
;
246 selected_byte_order (void)
248 if (target_byte_order_user
!= BFD_ENDIAN_UNKNOWN
)
249 return gdbarch_byte_order (current_gdbarch
);
251 return BFD_ENDIAN_UNKNOWN
;
254 /* Called by ``show endian''. */
257 show_endian (struct ui_file
*file
, int from_tty
, struct cmd_list_element
*c
,
260 if (target_byte_order_user
== BFD_ENDIAN_UNKNOWN
)
261 if (gdbarch_byte_order (current_gdbarch
) == BFD_ENDIAN_BIG
)
262 fprintf_unfiltered (file
, _("The target endianness is set automatically "
263 "(currently big endian)\n"));
265 fprintf_unfiltered (file
, _("The target endianness is set automatically "
266 "(currently little endian)\n"));
268 if (gdbarch_byte_order (current_gdbarch
) == BFD_ENDIAN_BIG
)
269 fprintf_unfiltered (file
,
270 _("The target is assumed to be big endian\n"));
272 fprintf_unfiltered (file
,
273 _("The target is assumed to be little endian\n"));
277 set_endian (char *ignore_args
, int from_tty
, struct cmd_list_element
*c
)
279 struct gdbarch_info info
;
281 gdbarch_info_init (&info
);
283 if (set_endian_string
== endian_auto
)
285 target_byte_order_user
= BFD_ENDIAN_UNKNOWN
;
286 if (! gdbarch_update_p (info
))
287 internal_error (__FILE__
, __LINE__
,
288 _("set_endian: architecture update failed"));
290 else if (set_endian_string
== endian_little
)
292 info
.byte_order
= BFD_ENDIAN_LITTLE
;
293 if (! gdbarch_update_p (info
))
294 printf_unfiltered (_("Little endian target not supported by GDB\n"));
296 target_byte_order_user
= BFD_ENDIAN_LITTLE
;
298 else if (set_endian_string
== endian_big
)
300 info
.byte_order
= BFD_ENDIAN_BIG
;
301 if (! gdbarch_update_p (info
))
302 printf_unfiltered (_("Big endian target not supported by GDB\n"));
304 target_byte_order_user
= BFD_ENDIAN_BIG
;
307 internal_error (__FILE__
, __LINE__
,
308 _("set_endian: bad value"));
310 show_endian (gdb_stdout
, from_tty
, NULL
, NULL
);
313 /* Given SELECTED, a currently selected BFD architecture, and
314 FROM_TARGET, a BFD architecture reported by the target description,
315 return what architecture to use. Either may be NULL; if both are
316 specified, we use the more specific. If the two are obviously
317 incompatible, warn the user. */
319 static const struct bfd_arch_info
*
320 choose_architecture_for_target (const struct bfd_arch_info
*selected
,
321 const struct bfd_arch_info
*from_target
)
323 const struct bfd_arch_info
*compat1
, *compat2
;
325 if (selected
== NULL
)
328 if (from_target
== NULL
)
331 /* struct bfd_arch_info objects are singletons: that is, there's
332 supposed to be exactly one instance for a given machine. So you
333 can tell whether two are equivalent by comparing pointers. */
334 if (from_target
== selected
)
337 /* BFD's 'A->compatible (A, B)' functions return zero if A and B are
338 incompatible. But if they are compatible, it returns the 'more
339 featureful' of the two arches. That is, if A can run code
340 written for B, but B can't run code written for A, then it'll
343 Some targets (e.g. MIPS as of 2006-12-04) don't fully
344 implement this, instead always returning NULL or the first
345 argument. We detect that case by checking both directions. */
347 compat1
= selected
->compatible (selected
, from_target
);
348 compat2
= from_target
->compatible (from_target
, selected
);
350 if (compat1
== NULL
&& compat2
== NULL
)
352 warning (_("Selected architecture %s is not compatible "
353 "with reported target architecture %s"),
354 selected
->printable_name
, from_target
->printable_name
);
362 if (compat1
== compat2
)
365 /* If the two didn't match, but one of them was a default architecture,
366 assume the more specific one is correct. This handles the case
367 where an executable or target description just says "mips", but
368 the other knows which MIPS variant. */
369 if (compat1
->the_default
)
371 if (compat2
->the_default
)
374 /* We have no idea which one is better. This is a bug, but not
375 a critical problem; warn the user. */
376 warning (_("Selected architecture %s is ambiguous with "
377 "reported target architecture %s"),
378 selected
->printable_name
, from_target
->printable_name
);
382 /* Functions to manipulate the architecture of the target */
384 enum set_arch
{ set_arch_auto
, set_arch_manual
};
386 static const struct bfd_arch_info
*target_architecture_user
;
388 static const char *set_architecture_string
;
391 selected_architecture_name (void)
393 if (target_architecture_user
== NULL
)
396 return set_architecture_string
;
399 /* Called if the user enters ``show architecture'' without an
403 show_architecture (struct ui_file
*file
, int from_tty
,
404 struct cmd_list_element
*c
, const char *value
)
407 arch
= TARGET_ARCHITECTURE
->printable_name
;
408 if (target_architecture_user
== NULL
)
409 fprintf_filtered (file
, _("\
410 The target architecture is set automatically (currently %s)\n"), arch
);
412 fprintf_filtered (file
, _("\
413 The target architecture is assumed to be %s\n"), arch
);
417 /* Called if the user enters ``set architecture'' with or without an
421 set_architecture (char *ignore_args
, int from_tty
, struct cmd_list_element
*c
)
423 struct gdbarch_info info
;
425 gdbarch_info_init (&info
);
427 if (strcmp (set_architecture_string
, "auto") == 0)
429 target_architecture_user
= NULL
;
430 if (!gdbarch_update_p (info
))
431 internal_error (__FILE__
, __LINE__
,
432 _("could not select an architecture automatically"));
436 info
.bfd_arch_info
= bfd_scan_arch (set_architecture_string
);
437 if (info
.bfd_arch_info
== NULL
)
438 internal_error (__FILE__
, __LINE__
,
439 _("set_architecture: bfd_scan_arch failed"));
440 if (gdbarch_update_p (info
))
441 target_architecture_user
= info
.bfd_arch_info
;
443 printf_unfiltered (_("Architecture `%s' not recognized.\n"),
444 set_architecture_string
);
446 show_architecture (gdb_stdout
, from_tty
, NULL
, NULL
);
449 /* Try to select a global architecture that matches "info". Return
450 non-zero if the attempt succeds. */
452 gdbarch_update_p (struct gdbarch_info info
)
454 struct gdbarch
*new_gdbarch
= gdbarch_find_by_info (info
);
456 /* If there no architecture by that name, reject the request. */
457 if (new_gdbarch
== NULL
)
460 fprintf_unfiltered (gdb_stdlog
, "gdbarch_update_p: "
461 "Architecture not found\n");
465 /* If it is the same old architecture, accept the request (but don't
467 if (new_gdbarch
== current_gdbarch
)
470 fprintf_unfiltered (gdb_stdlog
, "gdbarch_update_p: "
471 "Architecture 0x%08lx (%s) unchanged\n",
473 gdbarch_bfd_arch_info (new_gdbarch
)->printable_name
);
477 /* It's a new architecture, swap it in. */
479 fprintf_unfiltered (gdb_stdlog
, "gdbarch_update_p: "
480 "New architecture 0x%08lx (%s) selected\n",
482 gdbarch_bfd_arch_info (new_gdbarch
)->printable_name
);
483 deprecated_current_gdbarch_select_hack (new_gdbarch
);
488 /* Return the architecture for ABFD. If no suitable architecture
489 could be find, return NULL. */
492 gdbarch_from_bfd (bfd
*abfd
)
494 struct gdbarch
*old_gdbarch
= current_gdbarch
;
495 struct gdbarch
*new_gdbarch
;
496 struct gdbarch_info info
;
498 /* If we call gdbarch_find_by_info without filling in info.abfd,
499 then it will use the global exec_bfd. That's fine if we don't
500 have one of those either. And that's the only time we should
501 reach here with a NULL ABFD argument - when we are discarding
503 gdb_assert (abfd
!= NULL
|| exec_bfd
== NULL
);
505 gdbarch_info_init (&info
);
507 return gdbarch_find_by_info (info
);
510 /* Set the dynamic target-system-dependent parameters (architecture,
511 byte-order) using information found in the BFD */
514 set_gdbarch_from_file (bfd
*abfd
)
516 struct gdbarch
*gdbarch
;
518 gdbarch
= gdbarch_from_bfd (abfd
);
520 error (_("Architecture of file not recognized."));
521 deprecated_current_gdbarch_select_hack (gdbarch
);
524 /* Initialize the current architecture. Update the ``set
525 architecture'' command so that it specifies a list of valid
528 #ifdef DEFAULT_BFD_ARCH
529 extern const bfd_arch_info_type DEFAULT_BFD_ARCH
;
530 static const bfd_arch_info_type
*default_bfd_arch
= &DEFAULT_BFD_ARCH
;
532 static const bfd_arch_info_type
*default_bfd_arch
;
535 #ifdef DEFAULT_BFD_VEC
536 extern const bfd_target DEFAULT_BFD_VEC
;
537 static const bfd_target
*default_bfd_vec
= &DEFAULT_BFD_VEC
;
539 static const bfd_target
*default_bfd_vec
;
542 static int default_byte_order
= BFD_ENDIAN_UNKNOWN
;
545 initialize_current_architecture (void)
547 const char **arches
= gdbarch_printable_names ();
549 /* determine a default architecture and byte order. */
550 struct gdbarch_info info
;
551 gdbarch_info_init (&info
);
553 /* Find a default architecture. */
554 if (default_bfd_arch
== NULL
)
556 /* Choose the architecture by taking the first one
558 const char *chosen
= arches
[0];
560 for (arch
= arches
; *arch
!= NULL
; arch
++)
562 if (strcmp (*arch
, chosen
) < 0)
566 internal_error (__FILE__
, __LINE__
,
567 _("initialize_current_architecture: No arch"));
568 default_bfd_arch
= bfd_scan_arch (chosen
);
569 if (default_bfd_arch
== NULL
)
570 internal_error (__FILE__
, __LINE__
,
571 _("initialize_current_architecture: Arch not found"));
574 info
.bfd_arch_info
= default_bfd_arch
;
576 /* Take several guesses at a byte order. */
577 if (default_byte_order
== BFD_ENDIAN_UNKNOWN
578 && default_bfd_vec
!= NULL
)
580 /* Extract BFD's default vector's byte order. */
581 switch (default_bfd_vec
->byteorder
)
584 default_byte_order
= BFD_ENDIAN_BIG
;
586 case BFD_ENDIAN_LITTLE
:
587 default_byte_order
= BFD_ENDIAN_LITTLE
;
593 if (default_byte_order
== BFD_ENDIAN_UNKNOWN
)
595 /* look for ``*el-*'' in the target name. */
597 chp
= strchr (target_name
, '-');
599 && chp
- 2 >= target_name
600 && strncmp (chp
- 2, "el", 2) == 0)
601 default_byte_order
= BFD_ENDIAN_LITTLE
;
603 if (default_byte_order
== BFD_ENDIAN_UNKNOWN
)
605 /* Wire it to big-endian!!! */
606 default_byte_order
= BFD_ENDIAN_BIG
;
609 info
.byte_order
= default_byte_order
;
611 if (! gdbarch_update_p (info
))
612 internal_error (__FILE__
, __LINE__
,
613 _("initialize_current_architecture: Selection of "
614 "initial architecture failed"));
616 /* Create the ``set architecture'' command appending ``auto'' to the
617 list of architectures. */
619 struct cmd_list_element
*c
;
620 /* Append ``auto''. */
622 for (nr
= 0; arches
[nr
] != NULL
; nr
++);
623 arches
= xrealloc (arches
, sizeof (char*) * (nr
+ 2));
624 arches
[nr
+ 0] = "auto";
625 arches
[nr
+ 1] = NULL
;
626 add_setshow_enum_cmd ("architecture", class_support
,
627 arches
, &set_architecture_string
, _("\
628 Set architecture of target."), _("\
629 Show architecture of target."), NULL
,
630 set_architecture
, show_architecture
,
631 &setlist
, &showlist
);
632 add_alias_cmd ("processor", "architecture", class_support
, 1, &setlist
);
637 /* Initialize a gdbarch info to values that will be automatically
638 overridden. Note: Originally, this ``struct info'' was initialized
639 using memset(0). Unfortunately, that ran into problems, namely
640 BFD_ENDIAN_BIG is zero. An explicit initialization function that
641 can explicitly set each field to a well defined value is used. */
644 gdbarch_info_init (struct gdbarch_info
*info
)
646 memset (info
, 0, sizeof (struct gdbarch_info
));
647 info
->byte_order
= BFD_ENDIAN_UNKNOWN
;
648 info
->osabi
= GDB_OSABI_UNINITIALIZED
;
651 /* Similar to init, but this time fill in the blanks. Information is
652 obtained from the global "set ..." options and explicitly
653 initialized INFO fields. */
656 gdbarch_info_fill (struct gdbarch_info
*info
)
658 /* Check for the current file. */
659 if (info
->abfd
== NULL
)
660 info
->abfd
= exec_bfd
;
662 /* Check for the current target description. */
663 if (info
->target_desc
== NULL
)
664 info
->target_desc
= target_current_description ();
666 /* "(gdb) set architecture ...". */
667 if (info
->bfd_arch_info
== NULL
668 && target_architecture_user
)
669 info
->bfd_arch_info
= target_architecture_user
;
671 if (info
->bfd_arch_info
== NULL
672 && info
->abfd
!= NULL
673 && bfd_get_arch (info
->abfd
) != bfd_arch_unknown
674 && bfd_get_arch (info
->abfd
) != bfd_arch_obscure
)
675 info
->bfd_arch_info
= bfd_get_arch_info (info
->abfd
);
676 /* From the target. */
677 if (info
->target_desc
!= NULL
)
678 info
->bfd_arch_info
= choose_architecture_for_target
679 (info
->bfd_arch_info
, tdesc_architecture (info
->target_desc
));
680 /* From the default. */
681 if (info
->bfd_arch_info
== NULL
)
682 info
->bfd_arch_info
= default_bfd_arch
;
684 /* "(gdb) set byte-order ...". */
685 if (info
->byte_order
== BFD_ENDIAN_UNKNOWN
686 && target_byte_order_user
!= BFD_ENDIAN_UNKNOWN
)
687 info
->byte_order
= target_byte_order_user
;
688 /* From the INFO struct. */
689 if (info
->byte_order
== BFD_ENDIAN_UNKNOWN
690 && info
->abfd
!= NULL
)
691 info
->byte_order
= (bfd_big_endian (info
->abfd
) ? BFD_ENDIAN_BIG
692 : bfd_little_endian (info
->abfd
) ? BFD_ENDIAN_LITTLE
693 : BFD_ENDIAN_UNKNOWN
);
694 /* From the default. */
695 if (info
->byte_order
== BFD_ENDIAN_UNKNOWN
)
696 info
->byte_order
= default_byte_order
;
698 /* "(gdb) set osabi ...". Handled by gdbarch_lookup_osabi. */
699 if (info
->osabi
== GDB_OSABI_UNINITIALIZED
)
700 info
->osabi
= gdbarch_lookup_osabi (info
->abfd
);
702 /* Must have at least filled in the architecture. */
703 gdb_assert (info
->bfd_arch_info
!= NULL
);
708 extern initialize_file_ftype _initialize_gdbarch_utils
; /* -Wmissing-prototypes */
711 _initialize_gdbarch_utils (void)
713 struct cmd_list_element
*c
;
714 add_setshow_enum_cmd ("endian", class_support
,
715 endian_enum
, &set_endian_string
, _("\
716 Set endianness of target."), _("\
717 Show endianness of target."), NULL
,
718 set_endian
, show_endian
,
719 &setlist
, &showlist
);