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
< NUM_REGS
);
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
)
123 generic_remote_translate_xfer_address (struct gdbarch
*gdbarch
,
124 struct regcache
*regcache
,
125 CORE_ADDR gdb_addr
, int gdb_len
,
126 CORE_ADDR
* rem_addr
, int *rem_len
)
128 *rem_addr
= gdb_addr
;
132 /* Helper functions for INNER_THAN */
135 core_addr_lessthan (CORE_ADDR lhs
, CORE_ADDR rhs
)
141 core_addr_greaterthan (CORE_ADDR lhs
, CORE_ADDR rhs
)
146 /* Misc helper functions for targets. */
149 core_addr_identity (CORE_ADDR addr
)
155 convert_from_func_ptr_addr_identity (struct gdbarch
*gdbarch
, CORE_ADDR addr
,
156 struct target_ops
*targ
)
162 no_op_reg_to_regnum (int reg
)
168 default_elf_make_msymbol_special (asymbol
*sym
, struct minimal_symbol
*msym
)
174 default_coff_make_msymbol_special (int val
, struct minimal_symbol
*msym
)
180 cannot_register_not (int regnum
)
185 /* Legacy version of target_virtual_frame_pointer(). Assumes that
186 there is an DEPRECATED_FP_REGNUM and that it is the same, cooked or
190 legacy_virtual_frame_pointer (CORE_ADDR pc
,
192 LONGEST
*frame_offset
)
194 /* FIXME: cagney/2002-09-13: This code is used when identifying the
195 frame pointer of the current PC. It is assuming that a single
196 register and an offset can determine this. I think it should
197 instead generate a byte code expression as that would work better
198 with things like Dwarf2's CFI. */
199 if (DEPRECATED_FP_REGNUM
>= 0 && DEPRECATED_FP_REGNUM
< NUM_REGS
)
200 *frame_regnum
= DEPRECATED_FP_REGNUM
;
201 else if (SP_REGNUM
>= 0 && SP_REGNUM
< NUM_REGS
)
202 *frame_regnum
= SP_REGNUM
;
204 /* Should this be an internal error? I guess so, it is reflecting
205 an architectural limitation in the current design. */
206 internal_error (__FILE__
, __LINE__
, _("No virtual frame pointer available"));
210 /* Assume the world is sane, every register's virtual and real size
214 generic_register_size (int regnum
)
216 gdb_assert (regnum
>= 0 && regnum
< NUM_REGS
+ NUM_PSEUDO_REGS
);
217 return TYPE_LENGTH (register_type (current_gdbarch
, regnum
));
220 /* Assume all registers are adjacent. */
223 generic_register_byte (int regnum
)
227 gdb_assert (regnum
>= 0 && regnum
< NUM_REGS
+ NUM_PSEUDO_REGS
);
229 for (i
= 0; i
< regnum
; i
++)
231 byte
+= generic_register_size (i
);
238 legacy_pc_in_sigtramp (CORE_ADDR pc
, char *name
)
240 #if defined (DEPRECATED_IN_SIGTRAMP)
241 return DEPRECATED_IN_SIGTRAMP (pc
, name
);
243 return name
&& strcmp ("_sigtramp", name
) == 0;
248 generic_convert_register_p (int regnum
, struct type
*type
)
254 default_stabs_argument_has_addr (struct gdbarch
*gdbarch
, struct type
*type
)
260 generic_instruction_nullified (struct gdbarch
*gdbarch
,
261 struct regcache
*regcache
)
267 /* Functions to manipulate the endianness of the target. */
269 static int target_byte_order_user
= BFD_ENDIAN_UNKNOWN
;
271 static const char endian_big
[] = "big";
272 static const char endian_little
[] = "little";
273 static const char endian_auto
[] = "auto";
274 static const char *endian_enum
[] =
281 static const char *set_endian_string
;
283 /* Called by ``show endian''. */
286 show_endian (struct ui_file
*file
, int from_tty
, struct cmd_list_element
*c
,
289 if (target_byte_order_user
== BFD_ENDIAN_UNKNOWN
)
290 if (TARGET_BYTE_ORDER
== BFD_ENDIAN_BIG
)
291 fprintf_unfiltered (file
, _("The target endianness is set automatically "
292 "(currently big endian)\n"));
294 fprintf_unfiltered (file
, _("The target endianness is set automatically "
295 "(currently little endian)\n"));
297 if (TARGET_BYTE_ORDER
== BFD_ENDIAN_BIG
)
298 fprintf_unfiltered (file
,
299 _("The target is assumed to be big endian\n"));
301 fprintf_unfiltered (file
,
302 _("The target is assumed to be little endian\n"));
306 set_endian (char *ignore_args
, int from_tty
, struct cmd_list_element
*c
)
308 struct gdbarch_info info
;
310 gdbarch_info_init (&info
);
312 if (set_endian_string
== endian_auto
)
314 target_byte_order_user
= BFD_ENDIAN_UNKNOWN
;
315 if (! gdbarch_update_p (info
))
316 internal_error (__FILE__
, __LINE__
,
317 _("set_endian: architecture update failed"));
319 else if (set_endian_string
== endian_little
)
321 info
.byte_order
= BFD_ENDIAN_LITTLE
;
322 if (! gdbarch_update_p (info
))
323 printf_unfiltered (_("Little endian target not supported by GDB\n"));
325 target_byte_order_user
= BFD_ENDIAN_LITTLE
;
327 else if (set_endian_string
== endian_big
)
329 info
.byte_order
= BFD_ENDIAN_BIG
;
330 if (! gdbarch_update_p (info
))
331 printf_unfiltered (_("Big endian target not supported by GDB\n"));
333 target_byte_order_user
= BFD_ENDIAN_BIG
;
336 internal_error (__FILE__
, __LINE__
,
337 _("set_endian: bad value"));
339 show_endian (gdb_stdout
, from_tty
, NULL
, NULL
);
342 /* Given SELECTED, a currently selected BFD architecture, and
343 FROM_TARGET, a BFD architecture reported by the target description,
344 return what architecture to use. Either may be NULL; if both are
345 specified, we use the more specific. If the two are obviously
346 incompatible, warn the user. */
348 static const struct bfd_arch_info
*
349 choose_architecture_for_target (const struct bfd_arch_info
*selected
,
350 const struct bfd_arch_info
*from_target
)
352 const struct bfd_arch_info
*compat1
, *compat2
;
354 if (selected
== NULL
)
357 if (from_target
== NULL
)
360 /* struct bfd_arch_info objects are singletons: that is, there's
361 supposed to be exactly one instance for a given machine. So you
362 can tell whether two are equivalent by comparing pointers. */
363 if (from_target
== selected
)
366 /* BFD's 'A->compatible (A, B)' functions return zero if A and B are
367 incompatible. But if they are compatible, it returns the 'more
368 featureful' of the two arches. That is, if A can run code
369 written for B, but B can't run code written for A, then it'll
372 Some targets (e.g. MIPS as of 2006-12-04) don't fully
373 implement this, instead always returning NULL or the first
374 argument. We detect that case by checking both directions. */
376 compat1
= selected
->compatible (selected
, from_target
);
377 compat2
= from_target
->compatible (from_target
, selected
);
379 if (compat1
== NULL
&& compat2
== NULL
)
381 warning (_("Selected architecture %s is not compatible "
382 "with reported target architecture %s"),
383 selected
->printable_name
, from_target
->printable_name
);
391 if (compat1
== compat2
)
394 /* If the two didn't match, but one of them was a default architecture,
395 assume the more specific one is correct. This handles the case
396 where an executable or target description just says "mips", but
397 the other knows which MIPS variant. */
398 if (compat1
->the_default
)
400 if (compat2
->the_default
)
403 /* We have no idea which one is better. This is a bug, but not
404 a critical problem; warn the user. */
405 warning (_("Selected architecture %s is ambiguous with "
406 "reported target architecture %s"),
407 selected
->printable_name
, from_target
->printable_name
);
411 /* Functions to manipulate the architecture of the target */
413 enum set_arch
{ set_arch_auto
, set_arch_manual
};
415 static const struct bfd_arch_info
*target_architecture_user
;
417 static const char *set_architecture_string
;
420 selected_architecture_name (void)
422 if (target_architecture_user
== NULL
)
425 return set_architecture_string
;
428 /* Called if the user enters ``show architecture'' without an
432 show_architecture (struct ui_file
*file
, int from_tty
,
433 struct cmd_list_element
*c
, const char *value
)
436 arch
= TARGET_ARCHITECTURE
->printable_name
;
437 if (target_architecture_user
== NULL
)
438 fprintf_filtered (file
, _("\
439 The target architecture is set automatically (currently %s)\n"), arch
);
441 fprintf_filtered (file
, _("\
442 The target architecture is assumed to be %s\n"), arch
);
446 /* Called if the user enters ``set architecture'' with or without an
450 set_architecture (char *ignore_args
, int from_tty
, struct cmd_list_element
*c
)
452 struct gdbarch_info info
;
454 gdbarch_info_init (&info
);
456 if (strcmp (set_architecture_string
, "auto") == 0)
458 target_architecture_user
= NULL
;
459 if (!gdbarch_update_p (info
))
460 internal_error (__FILE__
, __LINE__
,
461 _("could not select an architecture automatically"));
465 info
.bfd_arch_info
= bfd_scan_arch (set_architecture_string
);
466 if (info
.bfd_arch_info
== NULL
)
467 internal_error (__FILE__
, __LINE__
,
468 _("set_architecture: bfd_scan_arch failed"));
469 if (gdbarch_update_p (info
))
470 target_architecture_user
= info
.bfd_arch_info
;
472 printf_unfiltered (_("Architecture `%s' not recognized.\n"),
473 set_architecture_string
);
475 show_architecture (gdb_stdout
, from_tty
, NULL
, NULL
);
478 /* Try to select a global architecture that matches "info". Return
479 non-zero if the attempt succeds. */
481 gdbarch_update_p (struct gdbarch_info info
)
483 struct gdbarch
*new_gdbarch
= gdbarch_find_by_info (info
);
485 /* If there no architecture by that name, reject the request. */
486 if (new_gdbarch
== NULL
)
489 fprintf_unfiltered (gdb_stdlog
, "gdbarch_update_p: "
490 "Architecture not found\n");
494 /* If it is the same old architecture, accept the request (but don't
496 if (new_gdbarch
== current_gdbarch
)
499 fprintf_unfiltered (gdb_stdlog
, "gdbarch_update_p: "
500 "Architecture 0x%08lx (%s) unchanged\n",
502 gdbarch_bfd_arch_info (new_gdbarch
)->printable_name
);
506 /* It's a new architecture, swap it in. */
508 fprintf_unfiltered (gdb_stdlog
, "gdbarch_update_p: "
509 "New architecture 0x%08lx (%s) selected\n",
511 gdbarch_bfd_arch_info (new_gdbarch
)->printable_name
);
512 deprecated_current_gdbarch_select_hack (new_gdbarch
);
517 /* Return the architecture for ABFD. If no suitable architecture
518 could be find, return NULL. */
521 gdbarch_from_bfd (bfd
*abfd
)
523 struct gdbarch
*old_gdbarch
= current_gdbarch
;
524 struct gdbarch
*new_gdbarch
;
525 struct gdbarch_info info
;
527 /* If we call gdbarch_find_by_info without filling in info.abfd,
528 then it will use the global exec_bfd. That's fine if we don't
529 have one of those either. And that's the only time we should
530 reach here with a NULL ABFD argument - when we are discarding
532 gdb_assert (abfd
!= NULL
|| exec_bfd
== NULL
);
534 gdbarch_info_init (&info
);
536 return gdbarch_find_by_info (info
);
539 /* Set the dynamic target-system-dependent parameters (architecture,
540 byte-order) using information found in the BFD */
543 set_gdbarch_from_file (bfd
*abfd
)
545 struct gdbarch
*gdbarch
;
547 gdbarch
= gdbarch_from_bfd (abfd
);
549 error (_("Architecture of file not recognized."));
550 deprecated_current_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
;
640 if (! gdbarch_update_p (info
))
641 internal_error (__FILE__
, __LINE__
,
642 _("initialize_current_architecture: Selection of "
643 "initial architecture failed"));
645 /* Create the ``set architecture'' command appending ``auto'' to the
646 list of architectures. */
648 struct cmd_list_element
*c
;
649 /* Append ``auto''. */
651 for (nr
= 0; arches
[nr
] != NULL
; nr
++);
652 arches
= xrealloc (arches
, sizeof (char*) * (nr
+ 2));
653 arches
[nr
+ 0] = "auto";
654 arches
[nr
+ 1] = NULL
;
655 add_setshow_enum_cmd ("architecture", class_support
,
656 arches
, &set_architecture_string
, _("\
657 Set architecture of target."), _("\
658 Show architecture of target."), NULL
,
659 set_architecture
, show_architecture
,
660 &setlist
, &showlist
);
661 add_alias_cmd ("processor", "architecture", class_support
, 1, &setlist
);
666 /* Initialize a gdbarch info to values that will be automatically
667 overridden. Note: Originally, this ``struct info'' was initialized
668 using memset(0). Unfortunately, that ran into problems, namely
669 BFD_ENDIAN_BIG is zero. An explicit initialization function that
670 can explicitly set each field to a well defined value is used. */
673 gdbarch_info_init (struct gdbarch_info
*info
)
675 memset (info
, 0, sizeof (struct gdbarch_info
));
676 info
->byte_order
= BFD_ENDIAN_UNKNOWN
;
677 info
->osabi
= GDB_OSABI_UNINITIALIZED
;
680 /* Similar to init, but this time fill in the blanks. Information is
681 obtained from the global "set ..." options and explicitly
682 initialized INFO fields. */
685 gdbarch_info_fill (struct gdbarch_info
*info
)
687 /* Check for the current file. */
688 if (info
->abfd
== NULL
)
689 info
->abfd
= exec_bfd
;
691 /* Check for the current target description. */
692 if (info
->target_desc
== NULL
)
693 info
->target_desc
= target_current_description ();
695 /* "(gdb) set architecture ...". */
696 if (info
->bfd_arch_info
== NULL
697 && target_architecture_user
)
698 info
->bfd_arch_info
= target_architecture_user
;
700 if (info
->bfd_arch_info
== NULL
701 && info
->abfd
!= NULL
702 && bfd_get_arch (info
->abfd
) != bfd_arch_unknown
703 && bfd_get_arch (info
->abfd
) != bfd_arch_obscure
)
704 info
->bfd_arch_info
= bfd_get_arch_info (info
->abfd
);
705 /* From the target. */
706 if (info
->target_desc
!= NULL
)
707 info
->bfd_arch_info
= choose_architecture_for_target
708 (info
->bfd_arch_info
, tdesc_architecture (info
->target_desc
));
709 /* From the default. */
710 if (info
->bfd_arch_info
== NULL
)
711 info
->bfd_arch_info
= default_bfd_arch
;
713 /* "(gdb) set byte-order ...". */
714 if (info
->byte_order
== BFD_ENDIAN_UNKNOWN
715 && target_byte_order_user
!= BFD_ENDIAN_UNKNOWN
)
716 info
->byte_order
= target_byte_order_user
;
717 /* From the INFO struct. */
718 if (info
->byte_order
== BFD_ENDIAN_UNKNOWN
719 && info
->abfd
!= NULL
)
720 info
->byte_order
= (bfd_big_endian (info
->abfd
) ? BFD_ENDIAN_BIG
721 : bfd_little_endian (info
->abfd
) ? BFD_ENDIAN_LITTLE
722 : BFD_ENDIAN_UNKNOWN
);
723 /* From the default. */
724 if (info
->byte_order
== BFD_ENDIAN_UNKNOWN
)
725 info
->byte_order
= default_byte_order
;
727 /* "(gdb) set osabi ...". Handled by gdbarch_lookup_osabi. */
728 if (info
->osabi
== GDB_OSABI_UNINITIALIZED
)
729 info
->osabi
= gdbarch_lookup_osabi (info
->abfd
);
731 /* Must have at least filled in the architecture. */
732 gdb_assert (info
->bfd_arch_info
!= NULL
);
737 extern initialize_file_ftype _initialize_gdbarch_utils
; /* -Wmissing-prototypes */
740 _initialize_gdbarch_utils (void)
742 struct cmd_list_element
*c
;
743 add_setshow_enum_cmd ("endian", class_support
,
744 endian_enum
, &set_endian_string
, _("\
745 Set endianness of target."), _("\
746 Show endianness of target."), NULL
,
747 set_endian
, show_endian
,
748 &setlist
, &showlist
);