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
)
147 /* Helper functions for TARGET_{FLOAT,DOUBLE}_FORMAT */
149 const struct floatformat
*
150 default_float_format (struct gdbarch
*gdbarch
)
152 int byte_order
= gdbarch_byte_order (gdbarch
);
156 return &floatformat_ieee_single_big
;
157 case BFD_ENDIAN_LITTLE
:
158 return &floatformat_ieee_single_little
;
160 internal_error (__FILE__
, __LINE__
,
161 _("default_float_format: bad byte order"));
166 const struct floatformat
*
167 default_double_format (struct gdbarch
*gdbarch
)
169 int byte_order
= gdbarch_byte_order (gdbarch
);
173 return &floatformat_ieee_double_big
;
174 case BFD_ENDIAN_LITTLE
:
175 return &floatformat_ieee_double_little
;
177 internal_error (__FILE__
, __LINE__
,
178 _("default_double_format: bad byte order"));
182 /* Misc helper functions for targets. */
185 core_addr_identity (CORE_ADDR addr
)
191 convert_from_func_ptr_addr_identity (struct gdbarch
*gdbarch
, CORE_ADDR addr
,
192 struct target_ops
*targ
)
198 no_op_reg_to_regnum (int reg
)
204 default_elf_make_msymbol_special (asymbol
*sym
, struct minimal_symbol
*msym
)
210 default_coff_make_msymbol_special (int val
, struct minimal_symbol
*msym
)
216 cannot_register_not (int regnum
)
221 /* Legacy version of target_virtual_frame_pointer(). Assumes that
222 there is an DEPRECATED_FP_REGNUM and that it is the same, cooked or
226 legacy_virtual_frame_pointer (CORE_ADDR pc
,
228 LONGEST
*frame_offset
)
230 /* FIXME: cagney/2002-09-13: This code is used when identifying the
231 frame pointer of the current PC. It is assuming that a single
232 register and an offset can determine this. I think it should
233 instead generate a byte code expression as that would work better
234 with things like Dwarf2's CFI. */
235 if (DEPRECATED_FP_REGNUM
>= 0 && DEPRECATED_FP_REGNUM
< NUM_REGS
)
236 *frame_regnum
= DEPRECATED_FP_REGNUM
;
237 else if (SP_REGNUM
>= 0 && SP_REGNUM
< NUM_REGS
)
238 *frame_regnum
= SP_REGNUM
;
240 /* Should this be an internal error? I guess so, it is reflecting
241 an architectural limitation in the current design. */
242 internal_error (__FILE__
, __LINE__
, _("No virtual frame pointer available"));
246 /* Assume the world is sane, every register's virtual and real size
250 generic_register_size (int regnum
)
252 gdb_assert (regnum
>= 0 && regnum
< NUM_REGS
+ NUM_PSEUDO_REGS
);
253 return TYPE_LENGTH (gdbarch_register_type (current_gdbarch
, regnum
));
256 /* Assume all registers are adjacent. */
259 generic_register_byte (int regnum
)
263 gdb_assert (regnum
>= 0 && regnum
< NUM_REGS
+ NUM_PSEUDO_REGS
);
265 for (i
= 0; i
< regnum
; i
++)
267 byte
+= generic_register_size (i
);
274 legacy_pc_in_sigtramp (CORE_ADDR pc
, char *name
)
276 #if defined (DEPRECATED_IN_SIGTRAMP)
277 return DEPRECATED_IN_SIGTRAMP (pc
, name
);
279 return name
&& strcmp ("_sigtramp", name
) == 0;
284 generic_convert_register_p (int regnum
, struct type
*type
)
290 default_stabs_argument_has_addr (struct gdbarch
*gdbarch
, struct type
*type
)
296 generic_instruction_nullified (struct gdbarch
*gdbarch
,
297 struct regcache
*regcache
)
303 /* Functions to manipulate the endianness of the target. */
305 static int target_byte_order_user
= BFD_ENDIAN_UNKNOWN
;
307 static const char endian_big
[] = "big";
308 static const char endian_little
[] = "little";
309 static const char endian_auto
[] = "auto";
310 static const char *endian_enum
[] =
317 static const char *set_endian_string
;
319 /* Called by ``show endian''. */
322 show_endian (struct ui_file
*file
, int from_tty
, struct cmd_list_element
*c
,
325 if (target_byte_order_user
== BFD_ENDIAN_UNKNOWN
)
326 if (TARGET_BYTE_ORDER
== BFD_ENDIAN_BIG
)
327 fprintf_unfiltered (file
, _("The target endianness is set automatically "
328 "(currently big endian)\n"));
330 fprintf_unfiltered (file
, _("The target endianness is set automatically "
331 "(currently little endian)\n"));
333 if (TARGET_BYTE_ORDER
== BFD_ENDIAN_BIG
)
334 fprintf_unfiltered (file
,
335 _("The target is assumed to be big endian\n"));
337 fprintf_unfiltered (file
,
338 _("The target is assumed to be little endian\n"));
342 set_endian (char *ignore_args
, int from_tty
, struct cmd_list_element
*c
)
344 struct gdbarch_info info
;
346 gdbarch_info_init (&info
);
348 if (set_endian_string
== endian_auto
)
350 target_byte_order_user
= BFD_ENDIAN_UNKNOWN
;
351 if (! gdbarch_update_p (info
))
352 internal_error (__FILE__
, __LINE__
,
353 _("set_endian: architecture update failed"));
355 else if (set_endian_string
== endian_little
)
357 info
.byte_order
= BFD_ENDIAN_LITTLE
;
358 if (! gdbarch_update_p (info
))
359 printf_unfiltered (_("Little endian target not supported by GDB\n"));
361 target_byte_order_user
= BFD_ENDIAN_LITTLE
;
363 else if (set_endian_string
== endian_big
)
365 info
.byte_order
= BFD_ENDIAN_BIG
;
366 if (! gdbarch_update_p (info
))
367 printf_unfiltered (_("Big endian target not supported by GDB\n"));
369 target_byte_order_user
= BFD_ENDIAN_BIG
;
372 internal_error (__FILE__
, __LINE__
,
373 _("set_endian: bad value"));
375 show_endian (gdb_stdout
, from_tty
, NULL
, NULL
);
378 /* Given SELECTED, a currently selected BFD architecture, and
379 FROM_TARGET, a BFD architecture reported by the target description,
380 return what architecture to use. Either may be NULL; if both are
381 specified, we use the more specific. If the two are obviously
382 incompatible, warn the user. */
384 static const struct bfd_arch_info
*
385 choose_architecture_for_target (const struct bfd_arch_info
*selected
,
386 const struct bfd_arch_info
*from_target
)
388 const struct bfd_arch_info
*compat1
, *compat2
;
390 if (selected
== NULL
)
393 if (from_target
== NULL
)
396 /* struct bfd_arch_info objects are singletons: that is, there's
397 supposed to be exactly one instance for a given machine. So you
398 can tell whether two are equivalent by comparing pointers. */
399 if (from_target
== selected
)
402 /* BFD's 'A->compatible (A, B)' functions return zero if A and B are
403 incompatible. But if they are compatible, it returns the 'more
404 featureful' of the two arches. That is, if A can run code
405 written for B, but B can't run code written for A, then it'll
408 Some targets (e.g. MIPS as of 2006-12-04) don't fully
409 implement this, instead always returning NULL or the first
410 argument. We detect that case by checking both directions. */
412 compat1
= selected
->compatible (selected
, from_target
);
413 compat2
= from_target
->compatible (from_target
, selected
);
415 if (compat1
== NULL
&& compat2
== NULL
)
417 warning (_("Selected architecture %s is not compatible "
418 "with reported target architecture %s"),
419 selected
->printable_name
, from_target
->printable_name
);
427 if (compat1
== compat2
)
430 /* If the two didn't match, but one of them was a default architecture,
431 assume the more specific one is correct. This handles the case
432 where an executable or target description just says "mips", but
433 the other knows which MIPS variant. */
434 if (compat1
->the_default
)
436 if (compat2
->the_default
)
439 /* We have no idea which one is better. This is a bug, but not
440 a critical problem; warn the user. */
441 warning (_("Selected architecture %s is ambiguous with "
442 "reported target architecture %s"),
443 selected
->printable_name
, from_target
->printable_name
);
447 /* Functions to manipulate the architecture of the target */
449 enum set_arch
{ set_arch_auto
, set_arch_manual
};
451 static const struct bfd_arch_info
*target_architecture_user
;
453 static const char *set_architecture_string
;
456 selected_architecture_name (void)
458 if (target_architecture_user
== NULL
)
461 return set_architecture_string
;
464 /* Called if the user enters ``show architecture'' without an
468 show_architecture (struct ui_file
*file
, int from_tty
,
469 struct cmd_list_element
*c
, const char *value
)
472 arch
= TARGET_ARCHITECTURE
->printable_name
;
473 if (target_architecture_user
== NULL
)
474 fprintf_filtered (file
, _("\
475 The target architecture is set automatically (currently %s)\n"), arch
);
477 fprintf_filtered (file
, _("\
478 The target architecture is assumed to be %s\n"), arch
);
482 /* Called if the user enters ``set architecture'' with or without an
486 set_architecture (char *ignore_args
, int from_tty
, struct cmd_list_element
*c
)
488 struct gdbarch_info info
;
490 gdbarch_info_init (&info
);
492 if (strcmp (set_architecture_string
, "auto") == 0)
494 target_architecture_user
= NULL
;
495 if (!gdbarch_update_p (info
))
496 internal_error (__FILE__
, __LINE__
,
497 _("could not select an architecture automatically"));
501 info
.bfd_arch_info
= bfd_scan_arch (set_architecture_string
);
502 if (info
.bfd_arch_info
== NULL
)
503 internal_error (__FILE__
, __LINE__
,
504 _("set_architecture: bfd_scan_arch failed"));
505 if (gdbarch_update_p (info
))
506 target_architecture_user
= info
.bfd_arch_info
;
508 printf_unfiltered (_("Architecture `%s' not recognized.\n"),
509 set_architecture_string
);
511 show_architecture (gdb_stdout
, from_tty
, NULL
, NULL
);
514 /* Try to select a global architecture that matches "info". Return
515 non-zero if the attempt succeds. */
517 gdbarch_update_p (struct gdbarch_info info
)
519 struct gdbarch
*new_gdbarch
= gdbarch_find_by_info (info
);
521 /* If there no architecture by that name, reject the request. */
522 if (new_gdbarch
== NULL
)
525 fprintf_unfiltered (gdb_stdlog
, "gdbarch_update_p: "
526 "Architecture not found\n");
530 /* If it is the same old architecture, accept the request (but don't
532 if (new_gdbarch
== current_gdbarch
)
535 fprintf_unfiltered (gdb_stdlog
, "gdbarch_update_p: "
536 "Architecture 0x%08lx (%s) unchanged\n",
538 gdbarch_bfd_arch_info (new_gdbarch
)->printable_name
);
542 /* It's a new architecture, swap it in. */
544 fprintf_unfiltered (gdb_stdlog
, "gdbarch_update_p: "
545 "New architecture 0x%08lx (%s) selected\n",
547 gdbarch_bfd_arch_info (new_gdbarch
)->printable_name
);
548 deprecated_current_gdbarch_select_hack (new_gdbarch
);
553 /* Return the architecture for ABFD. If no suitable architecture
554 could be find, return NULL. */
557 gdbarch_from_bfd (bfd
*abfd
)
559 struct gdbarch
*old_gdbarch
= current_gdbarch
;
560 struct gdbarch
*new_gdbarch
;
561 struct gdbarch_info info
;
563 /* If we call gdbarch_find_by_info without filling in info.abfd,
564 then it will use the global exec_bfd. That's fine if we don't
565 have one of those either. And that's the only time we should
566 reach here with a NULL ABFD argument - when we are discarding
568 gdb_assert (abfd
!= NULL
|| exec_bfd
== NULL
);
570 gdbarch_info_init (&info
);
572 return gdbarch_find_by_info (info
);
575 /* Set the dynamic target-system-dependent parameters (architecture,
576 byte-order) using information found in the BFD */
579 set_gdbarch_from_file (bfd
*abfd
)
581 struct gdbarch
*gdbarch
;
583 gdbarch
= gdbarch_from_bfd (abfd
);
585 error (_("Architecture of file not recognized."));
586 deprecated_current_gdbarch_select_hack (gdbarch
);
589 /* Initialize the current architecture. Update the ``set
590 architecture'' command so that it specifies a list of valid
593 #ifdef DEFAULT_BFD_ARCH
594 extern const bfd_arch_info_type DEFAULT_BFD_ARCH
;
595 static const bfd_arch_info_type
*default_bfd_arch
= &DEFAULT_BFD_ARCH
;
597 static const bfd_arch_info_type
*default_bfd_arch
;
600 #ifdef DEFAULT_BFD_VEC
601 extern const bfd_target DEFAULT_BFD_VEC
;
602 static const bfd_target
*default_bfd_vec
= &DEFAULT_BFD_VEC
;
604 static const bfd_target
*default_bfd_vec
;
607 static int default_byte_order
= BFD_ENDIAN_UNKNOWN
;
610 initialize_current_architecture (void)
612 const char **arches
= gdbarch_printable_names ();
614 /* determine a default architecture and byte order. */
615 struct gdbarch_info info
;
616 gdbarch_info_init (&info
);
618 /* Find a default architecture. */
619 if (default_bfd_arch
== NULL
)
621 /* Choose the architecture by taking the first one
623 const char *chosen
= arches
[0];
625 for (arch
= arches
; *arch
!= NULL
; arch
++)
627 if (strcmp (*arch
, chosen
) < 0)
631 internal_error (__FILE__
, __LINE__
,
632 _("initialize_current_architecture: No arch"));
633 default_bfd_arch
= bfd_scan_arch (chosen
);
634 if (default_bfd_arch
== NULL
)
635 internal_error (__FILE__
, __LINE__
,
636 _("initialize_current_architecture: Arch not found"));
639 info
.bfd_arch_info
= default_bfd_arch
;
641 /* Take several guesses at a byte order. */
642 if (default_byte_order
== BFD_ENDIAN_UNKNOWN
643 && default_bfd_vec
!= NULL
)
645 /* Extract BFD's default vector's byte order. */
646 switch (default_bfd_vec
->byteorder
)
649 default_byte_order
= BFD_ENDIAN_BIG
;
651 case BFD_ENDIAN_LITTLE
:
652 default_byte_order
= BFD_ENDIAN_LITTLE
;
658 if (default_byte_order
== BFD_ENDIAN_UNKNOWN
)
660 /* look for ``*el-*'' in the target name. */
662 chp
= strchr (target_name
, '-');
664 && chp
- 2 >= target_name
665 && strncmp (chp
- 2, "el", 2) == 0)
666 default_byte_order
= BFD_ENDIAN_LITTLE
;
668 if (default_byte_order
== BFD_ENDIAN_UNKNOWN
)
670 /* Wire it to big-endian!!! */
671 default_byte_order
= BFD_ENDIAN_BIG
;
674 info
.byte_order
= default_byte_order
;
676 if (! gdbarch_update_p (info
))
677 internal_error (__FILE__
, __LINE__
,
678 _("initialize_current_architecture: Selection of "
679 "initial architecture failed"));
681 /* Create the ``set architecture'' command appending ``auto'' to the
682 list of architectures. */
684 struct cmd_list_element
*c
;
685 /* Append ``auto''. */
687 for (nr
= 0; arches
[nr
] != NULL
; nr
++);
688 arches
= xrealloc (arches
, sizeof (char*) * (nr
+ 2));
689 arches
[nr
+ 0] = "auto";
690 arches
[nr
+ 1] = NULL
;
691 add_setshow_enum_cmd ("architecture", class_support
,
692 arches
, &set_architecture_string
, _("\
693 Set architecture of target."), _("\
694 Show architecture of target."), NULL
,
695 set_architecture
, show_architecture
,
696 &setlist
, &showlist
);
697 add_alias_cmd ("processor", "architecture", class_support
, 1, &setlist
);
702 /* Initialize a gdbarch info to values that will be automatically
703 overridden. Note: Originally, this ``struct info'' was initialized
704 using memset(0). Unfortunately, that ran into problems, namely
705 BFD_ENDIAN_BIG is zero. An explicit initialization function that
706 can explicitly set each field to a well defined value is used. */
709 gdbarch_info_init (struct gdbarch_info
*info
)
711 memset (info
, 0, sizeof (struct gdbarch_info
));
712 info
->byte_order
= BFD_ENDIAN_UNKNOWN
;
713 info
->osabi
= GDB_OSABI_UNINITIALIZED
;
716 /* Similar to init, but this time fill in the blanks. Information is
717 obtained from the global "set ..." options and explicitly
718 initialized INFO fields. */
721 gdbarch_info_fill (struct gdbarch_info
*info
)
723 /* Check for the current file. */
724 if (info
->abfd
== NULL
)
725 info
->abfd
= exec_bfd
;
727 /* Check for the current target description. */
728 if (info
->target_desc
== NULL
)
729 info
->target_desc
= target_current_description ();
731 /* "(gdb) set architecture ...". */
732 if (info
->bfd_arch_info
== NULL
733 && target_architecture_user
)
734 info
->bfd_arch_info
= target_architecture_user
;
736 if (info
->bfd_arch_info
== NULL
737 && info
->abfd
!= NULL
738 && bfd_get_arch (info
->abfd
) != bfd_arch_unknown
739 && bfd_get_arch (info
->abfd
) != bfd_arch_obscure
)
740 info
->bfd_arch_info
= bfd_get_arch_info (info
->abfd
);
741 /* From the target. */
742 if (info
->target_desc
!= NULL
)
743 info
->bfd_arch_info
= choose_architecture_for_target
744 (info
->bfd_arch_info
, tdesc_architecture (info
->target_desc
));
745 /* From the default. */
746 if (info
->bfd_arch_info
== NULL
)
747 info
->bfd_arch_info
= default_bfd_arch
;
749 /* "(gdb) set byte-order ...". */
750 if (info
->byte_order
== BFD_ENDIAN_UNKNOWN
751 && target_byte_order_user
!= BFD_ENDIAN_UNKNOWN
)
752 info
->byte_order
= target_byte_order_user
;
753 /* From the INFO struct. */
754 if (info
->byte_order
== BFD_ENDIAN_UNKNOWN
755 && info
->abfd
!= NULL
)
756 info
->byte_order
= (bfd_big_endian (info
->abfd
) ? BFD_ENDIAN_BIG
757 : bfd_little_endian (info
->abfd
) ? BFD_ENDIAN_LITTLE
758 : BFD_ENDIAN_UNKNOWN
);
759 /* From the default. */
760 if (info
->byte_order
== BFD_ENDIAN_UNKNOWN
)
761 info
->byte_order
= default_byte_order
;
763 /* "(gdb) set osabi ...". Handled by gdbarch_lookup_osabi. */
764 if (info
->osabi
== GDB_OSABI_UNINITIALIZED
)
765 info
->osabi
= gdbarch_lookup_osabi (info
->abfd
);
767 /* Must have at least filled in the architecture. */
768 gdb_assert (info
->bfd_arch_info
!= NULL
);
773 extern initialize_file_ftype _initialize_gdbarch_utils
; /* -Wmissing-prototypes */
776 _initialize_gdbarch_utils (void)
778 struct cmd_list_element
*c
;
779 add_setshow_enum_cmd ("endian", class_support
,
780 endian_enum
, &set_endian_string
, _("\
781 Set endianness of target."), _("\
782 Show endianness of target."), NULL
,
783 set_endian
, show_endian
,
784 &setlist
, &showlist
);