1 /* Dynamic architecture support for GDB, the GNU debugger.
3 Copyright 1998, 1999, 2000, 2001, 2002, 2003 Free Software Foundation,
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., 59 Temple Place - Suite 330,
21 Boston, MA 02111-1307, 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"
38 #include "floatformat.h"
40 /* Implementation of extract return value that grubs around in the
43 legacy_extract_return_value (struct type
*type
, struct regcache
*regcache
,
46 char *registers
= deprecated_grub_regcache_for_registers (regcache
);
47 bfd_byte
*buf
= valbuf
;
48 DEPRECATED_EXTRACT_RETURN_VALUE (type
, registers
, buf
); /* OK */
51 /* Implementation of store return value that grubs the register cache.
52 Takes a local copy of the buffer to avoid const problems. */
54 legacy_store_return_value (struct type
*type
, struct regcache
*regcache
,
57 bfd_byte
*b
= alloca (TYPE_LENGTH (type
));
58 gdb_assert (regcache
== current_regcache
);
59 memcpy (b
, buf
, TYPE_LENGTH (type
));
60 DEPRECATED_STORE_RETURN_VALUE (type
, b
);
65 always_use_struct_convention (int gcc_p
, struct type
*value_type
)
72 legacy_register_sim_regno (int regnum
)
74 /* Only makes sense to supply raw registers. */
75 gdb_assert (regnum
>= 0 && regnum
< NUM_REGS
);
76 /* NOTE: cagney/2002-05-13: The old code did it this way and it is
77 suspected that some GDB/SIM combinations may rely on this
78 behavour. The default should be one2one_register_sim_regno
80 if (REGISTER_NAME (regnum
) != NULL
81 && REGISTER_NAME (regnum
)[0] != '\0')
84 return LEGACY_SIM_REGNO_IGNORE
;
88 generic_frameless_function_invocation_not (struct frame_info
*fi
)
94 generic_return_value_on_stack_not (struct type
*type
)
100 generic_skip_trampoline_code (CORE_ADDR pc
)
106 generic_skip_solib_resolver (CORE_ADDR pc
)
112 generic_in_solib_call_trampoline (CORE_ADDR pc
, char *name
)
118 generic_in_solib_return_trampoline (CORE_ADDR pc
, char *name
)
124 generic_in_function_epilogue_p (struct gdbarch
*gdbarch
, CORE_ADDR pc
)
129 #if defined (CALL_DUMMY)
130 LONGEST legacy_call_dummy_words
[] = CALL_DUMMY
;
132 LONGEST legacy_call_dummy_words
[1];
134 int legacy_sizeof_call_dummy_words
= sizeof (legacy_call_dummy_words
);
137 generic_remote_translate_xfer_address (struct gdbarch
*gdbarch
,
138 struct regcache
*regcache
,
139 CORE_ADDR gdb_addr
, int gdb_len
,
140 CORE_ADDR
* rem_addr
, int *rem_len
)
142 *rem_addr
= gdb_addr
;
147 generic_prologue_frameless_p (CORE_ADDR ip
)
149 return ip
== SKIP_PROLOGUE (ip
);
152 /* Helper functions for INNER_THAN */
155 core_addr_lessthan (CORE_ADDR lhs
, CORE_ADDR rhs
)
161 core_addr_greaterthan (CORE_ADDR lhs
, CORE_ADDR rhs
)
167 /* Helper functions for TARGET_{FLOAT,DOUBLE}_FORMAT */
169 const struct floatformat
*
170 default_float_format (struct gdbarch
*gdbarch
)
172 int byte_order
= gdbarch_byte_order (gdbarch
);
176 return &floatformat_ieee_single_big
;
177 case BFD_ENDIAN_LITTLE
:
178 return &floatformat_ieee_single_little
;
180 internal_error (__FILE__
, __LINE__
,
181 "default_float_format: bad byte order");
186 const struct floatformat
*
187 default_double_format (struct gdbarch
*gdbarch
)
189 int byte_order
= gdbarch_byte_order (gdbarch
);
193 return &floatformat_ieee_double_big
;
194 case BFD_ENDIAN_LITTLE
:
195 return &floatformat_ieee_double_little
;
197 internal_error (__FILE__
, __LINE__
,
198 "default_double_format: bad byte order");
202 /* Misc helper functions for targets. */
205 deprecated_register_convertible_not (int num
)
212 core_addr_identity (CORE_ADDR addr
)
218 convert_from_func_ptr_addr_identity (struct gdbarch
*gdbarch
, CORE_ADDR addr
,
219 struct target_ops
*targ
)
225 no_op_reg_to_regnum (int reg
)
231 deprecated_init_frame_pc_default (int fromleaf
, struct frame_info
*prev
)
233 if (fromleaf
&& DEPRECATED_SAVED_PC_AFTER_CALL_P ())
234 return DEPRECATED_SAVED_PC_AFTER_CALL (get_next_frame (prev
));
235 else if (get_next_frame (prev
) != NULL
)
236 return DEPRECATED_FRAME_SAVED_PC (get_next_frame (prev
));
242 default_elf_make_msymbol_special (asymbol
*sym
, struct minimal_symbol
*msym
)
248 default_coff_make_msymbol_special (int val
, struct minimal_symbol
*msym
)
254 cannot_register_not (int regnum
)
259 /* Legacy version of target_virtual_frame_pointer(). Assumes that
260 there is an DEPRECATED_FP_REGNUM and that it is the same, cooked or
264 legacy_virtual_frame_pointer (CORE_ADDR pc
,
266 LONGEST
*frame_offset
)
268 /* FIXME: cagney/2002-09-13: This code is used when identifying the
269 frame pointer of the current PC. It is assuming that a single
270 register and an offset can determine this. I think it should
271 instead generate a byte code expression as that would work better
272 with things like Dwarf2's CFI. */
273 if (DEPRECATED_FP_REGNUM
>= 0 && DEPRECATED_FP_REGNUM
< NUM_REGS
)
274 *frame_regnum
= DEPRECATED_FP_REGNUM
;
275 else if (SP_REGNUM
>= 0 && SP_REGNUM
< NUM_REGS
)
276 *frame_regnum
= SP_REGNUM
;
278 /* Should this be an internal error? I guess so, it is reflecting
279 an architectural limitation in the current design. */
280 internal_error (__FILE__
, __LINE__
, "No virtual frame pointer available");
284 /* Assume the world is sane, every register's virtual and real size
288 generic_register_size (int regnum
)
290 gdb_assert (regnum
>= 0 && regnum
< NUM_REGS
+ NUM_PSEUDO_REGS
);
291 if (gdbarch_register_type_p (current_gdbarch
))
292 return TYPE_LENGTH (gdbarch_register_type (current_gdbarch
, regnum
));
294 /* FIXME: cagney/2003-03-01: Once all architectures implement
295 gdbarch_register_type(), this entire function can go away. It
296 is made obsolete by register_size(). */
297 return TYPE_LENGTH (DEPRECATED_REGISTER_VIRTUAL_TYPE (regnum
)); /* OK */
300 /* Assume all registers are adjacent. */
303 generic_register_byte (int regnum
)
307 gdb_assert (regnum
>= 0 && regnum
< NUM_REGS
+ NUM_PSEUDO_REGS
);
309 for (i
= 0; i
< regnum
; i
++)
311 byte
+= generic_register_size (i
);
318 legacy_pc_in_sigtramp (CORE_ADDR pc
, char *name
)
320 #if !defined (IN_SIGTRAMP)
321 if (SIGTRAMP_START_P ())
322 return (pc
) >= SIGTRAMP_START (pc
) && (pc
) < SIGTRAMP_END (pc
);
324 return name
&& strcmp ("_sigtramp", name
) == 0;
326 return IN_SIGTRAMP (pc
, name
);
331 legacy_convert_register_p (int regnum
, struct type
*type
)
333 return DEPRECATED_REGISTER_CONVERTIBLE (regnum
);
337 legacy_register_to_value (struct frame_info
*frame
, int regnum
,
338 struct type
*type
, void *to
)
340 char from
[MAX_REGISTER_SIZE
];
341 get_frame_register (frame
, regnum
, from
);
342 DEPRECATED_REGISTER_CONVERT_TO_VIRTUAL (regnum
, type
, from
, to
);
346 legacy_value_to_register (struct frame_info
*frame
, int regnum
,
347 struct type
*type
, const void *tmp
)
349 char to
[MAX_REGISTER_SIZE
];
350 char *from
= alloca (TYPE_LENGTH (type
));
351 memcpy (from
, from
, TYPE_LENGTH (type
));
352 DEPRECATED_REGISTER_CONVERT_TO_RAW (type
, regnum
, from
, to
);
353 put_frame_register (frame
, regnum
, to
);
357 default_stabs_argument_has_addr (struct gdbarch
*gdbarch
, struct type
*type
)
359 if (DEPRECATED_REG_STRUCT_HAS_ADDR_P ()
360 && DEPRECATED_REG_STRUCT_HAS_ADDR (processing_gcc_compilation
, type
))
362 CHECK_TYPEDEF (type
);
364 return (TYPE_CODE (type
) == TYPE_CODE_STRUCT
365 || TYPE_CODE (type
) == TYPE_CODE_UNION
366 || TYPE_CODE (type
) == TYPE_CODE_SET
367 || TYPE_CODE (type
) == TYPE_CODE_BITSTRING
);
374 /* Functions to manipulate the endianness of the target. */
376 /* ``target_byte_order'' is only used when non- multi-arch.
377 Multi-arch targets obtain the current byte order using the
378 TARGET_BYTE_ORDER gdbarch method.
380 The choice of initial value is entirely arbitrary. During startup,
381 the function initialize_current_architecture() updates this value
382 based on default byte-order information extracted from BFD. */
383 int target_byte_order
= BFD_ENDIAN_BIG
;
384 int target_byte_order_auto
= 1;
386 static const char endian_big
[] = "big";
387 static const char endian_little
[] = "little";
388 static const char endian_auto
[] = "auto";
389 static const char *endian_enum
[] =
396 static const char *set_endian_string
;
398 /* Called by ``show endian''. */
401 show_endian (char *args
, int from_tty
)
403 if (TARGET_BYTE_ORDER_AUTO
)
404 printf_unfiltered ("The target endianness is set automatically (currently %s endian)\n",
405 (TARGET_BYTE_ORDER
== BFD_ENDIAN_BIG
? "big" : "little"));
407 printf_unfiltered ("The target is assumed to be %s endian\n",
408 (TARGET_BYTE_ORDER
== BFD_ENDIAN_BIG
? "big" : "little"));
412 set_endian (char *ignore_args
, int from_tty
, struct cmd_list_element
*c
)
414 if (set_endian_string
== endian_auto
)
416 target_byte_order_auto
= 1;
418 else if (set_endian_string
== endian_little
)
420 struct gdbarch_info info
;
421 target_byte_order_auto
= 0;
422 gdbarch_info_init (&info
);
423 info
.byte_order
= BFD_ENDIAN_LITTLE
;
424 if (! gdbarch_update_p (info
))
425 printf_unfiltered ("Little endian target not supported by GDB\n");
427 else if (set_endian_string
== endian_big
)
429 struct gdbarch_info info
;
430 target_byte_order_auto
= 0;
431 gdbarch_info_init (&info
);
432 info
.byte_order
= BFD_ENDIAN_BIG
;
433 if (! gdbarch_update_p (info
))
434 printf_unfiltered ("Big endian target not supported by GDB\n");
437 internal_error (__FILE__
, __LINE__
,
438 "set_endian: bad value");
439 show_endian (NULL
, from_tty
);
442 /* Functions to manipulate the architecture of the target */
444 enum set_arch
{ set_arch_auto
, set_arch_manual
};
446 int target_architecture_auto
= 1;
448 const char *set_architecture_string
;
450 /* Called if the user enters ``show architecture'' without an
454 show_architecture (char *args
, int from_tty
)
457 arch
= TARGET_ARCHITECTURE
->printable_name
;
458 if (target_architecture_auto
)
459 printf_filtered ("The target architecture is set automatically (currently %s)\n", arch
);
461 printf_filtered ("The target architecture is assumed to be %s\n", arch
);
465 /* Called if the user enters ``set architecture'' with or without an
469 set_architecture (char *ignore_args
, int from_tty
, struct cmd_list_element
*c
)
471 if (strcmp (set_architecture_string
, "auto") == 0)
473 target_architecture_auto
= 1;
477 struct gdbarch_info info
;
478 gdbarch_info_init (&info
);
479 info
.bfd_arch_info
= bfd_scan_arch (set_architecture_string
);
480 if (info
.bfd_arch_info
== NULL
)
481 internal_error (__FILE__
, __LINE__
,
482 "set_architecture: bfd_scan_arch failed");
483 if (gdbarch_update_p (info
))
484 target_architecture_auto
= 0;
486 printf_unfiltered ("Architecture `%s' not recognized.\n",
487 set_architecture_string
);
489 show_architecture (NULL
, from_tty
);
492 /* Try to select a global architecture that matches "info". Return
493 non-zero if the attempt succeds. */
495 gdbarch_update_p (struct gdbarch_info info
)
497 struct gdbarch
*new_gdbarch
= gdbarch_find_by_info (info
);
499 /* If there no architecture by that name, reject the request. */
500 if (new_gdbarch
== NULL
)
503 fprintf_unfiltered (gdb_stdlog
, "gdbarch_update_p: "
504 "Architecture not found\n");
508 /* If it is the same old architecture, accept the request (but don't
510 if (new_gdbarch
== current_gdbarch
)
513 fprintf_unfiltered (gdb_stdlog
, "gdbarch_update_p: "
514 "Architecture 0x%08lx (%s) unchanged\n",
516 gdbarch_bfd_arch_info (new_gdbarch
)->printable_name
);
520 /* It's a new architecture, swap it in. */
522 fprintf_unfiltered (gdb_stdlog
, "gdbarch_update_p: "
523 "New architecture 0x%08lx (%s) selected\n",
525 gdbarch_bfd_arch_info (new_gdbarch
)->printable_name
);
526 deprecated_current_gdbarch_select_hack (new_gdbarch
);
531 /* Return the architecture for ABFD. If no suitable architecture
532 could be find, return NULL. */
535 gdbarch_from_bfd (bfd
*abfd
)
537 struct gdbarch
*old_gdbarch
= current_gdbarch
;
538 struct gdbarch
*new_gdbarch
;
539 struct gdbarch_info info
;
541 gdbarch_info_init (&info
);
543 return gdbarch_find_by_info (info
);
546 /* Set the dynamic target-system-dependent parameters (architecture,
547 byte-order) using information found in the BFD */
550 set_gdbarch_from_file (bfd
*abfd
)
552 struct gdbarch
*gdbarch
;
554 gdbarch
= gdbarch_from_bfd (abfd
);
556 error ("Architecture of file not recognized.\n");
557 deprecated_current_gdbarch_select_hack (gdbarch
);
560 /* Initialize the current architecture. Update the ``set
561 architecture'' command so that it specifies a list of valid
564 #ifdef DEFAULT_BFD_ARCH
565 extern const bfd_arch_info_type DEFAULT_BFD_ARCH
;
566 static const bfd_arch_info_type
*default_bfd_arch
= &DEFAULT_BFD_ARCH
;
568 static const bfd_arch_info_type
*default_bfd_arch
;
571 #ifdef DEFAULT_BFD_VEC
572 extern const bfd_target DEFAULT_BFD_VEC
;
573 static const bfd_target
*default_bfd_vec
= &DEFAULT_BFD_VEC
;
575 static const bfd_target
*default_bfd_vec
;
579 initialize_current_architecture (void)
581 const char **arches
= gdbarch_printable_names ();
583 /* determine a default architecture and byte order. */
584 struct gdbarch_info info
;
585 gdbarch_info_init (&info
);
587 /* Find a default architecture. */
588 if (info
.bfd_arch_info
== NULL
589 && default_bfd_arch
!= NULL
)
590 info
.bfd_arch_info
= default_bfd_arch
;
591 if (info
.bfd_arch_info
== NULL
)
593 /* Choose the architecture by taking the first one
595 const char *chosen
= arches
[0];
597 for (arch
= arches
; *arch
!= NULL
; arch
++)
599 if (strcmp (*arch
, chosen
) < 0)
603 internal_error (__FILE__
, __LINE__
,
604 "initialize_current_architecture: No arch");
605 info
.bfd_arch_info
= bfd_scan_arch (chosen
);
606 if (info
.bfd_arch_info
== NULL
)
607 internal_error (__FILE__
, __LINE__
,
608 "initialize_current_architecture: Arch not found");
611 /* Take several guesses at a byte order. */
612 if (info
.byte_order
== BFD_ENDIAN_UNKNOWN
613 && default_bfd_vec
!= NULL
)
615 /* Extract BFD's default vector's byte order. */
616 switch (default_bfd_vec
->byteorder
)
619 info
.byte_order
= BFD_ENDIAN_BIG
;
621 case BFD_ENDIAN_LITTLE
:
622 info
.byte_order
= BFD_ENDIAN_LITTLE
;
628 if (info
.byte_order
== BFD_ENDIAN_UNKNOWN
)
630 /* look for ``*el-*'' in the target name. */
632 chp
= strchr (target_name
, '-');
634 && chp
- 2 >= target_name
635 && strncmp (chp
- 2, "el", 2) == 0)
636 info
.byte_order
= BFD_ENDIAN_LITTLE
;
638 if (info
.byte_order
== BFD_ENDIAN_UNKNOWN
)
640 /* Wire it to big-endian!!! */
641 info
.byte_order
= BFD_ENDIAN_BIG
;
644 if (! gdbarch_update_p (info
))
645 internal_error (__FILE__
, __LINE__
,
646 "initialize_current_architecture: Selection of initial architecture failed");
648 /* Create the ``set architecture'' command appending ``auto'' to the
649 list of architectures. */
651 struct cmd_list_element
*c
;
652 /* Append ``auto''. */
654 for (nr
= 0; arches
[nr
] != NULL
; nr
++);
655 arches
= xrealloc (arches
, sizeof (char*) * (nr
+ 2));
656 arches
[nr
+ 0] = "auto";
657 arches
[nr
+ 1] = NULL
;
658 /* FIXME: add_set_enum_cmd() uses an array of ``char *'' instead
659 of ``const char *''. We just happen to know that the casts are
661 c
= add_set_enum_cmd ("architecture", class_support
,
662 arches
, &set_architecture_string
,
663 "Set architecture of target.",
665 set_cmd_sfunc (c
, set_architecture
);
666 add_alias_cmd ("processor", "architecture", class_support
, 1, &setlist
);
667 /* Don't use set_from_show - need to print both auto/manual and
669 add_cmd ("architecture", class_support
, show_architecture
,
670 "Show the current target architecture", &showlist
);
675 /* Initialize a gdbarch info to values that will be automatically
676 overridden. Note: Originally, this ``struct info'' was initialized
677 using memset(0). Unfortunately, that ran into problems, namely
678 BFD_ENDIAN_BIG is zero. An explicit initialization function that
679 can explicitly set each field to a well defined value is used. */
682 gdbarch_info_init (struct gdbarch_info
*info
)
684 memset (info
, 0, sizeof (struct gdbarch_info
));
685 info
->byte_order
= BFD_ENDIAN_UNKNOWN
;
686 info
->osabi
= GDB_OSABI_UNINITIALIZED
;
689 /* Similar to init, but this time fill in the blanks. Information is
690 obtained from the specified architecture, global "set ..." options,
691 and explicitly initialized INFO fields. */
694 gdbarch_info_fill (struct gdbarch
*gdbarch
, struct gdbarch_info
*info
)
696 /* "(gdb) set architecture ...". */
697 if (info
->bfd_arch_info
== NULL
698 && !target_architecture_auto
700 info
->bfd_arch_info
= gdbarch_bfd_arch_info (gdbarch
);
701 if (info
->bfd_arch_info
== NULL
702 && info
->abfd
!= NULL
703 && bfd_get_arch (info
->abfd
) != bfd_arch_unknown
704 && bfd_get_arch (info
->abfd
) != bfd_arch_obscure
)
705 info
->bfd_arch_info
= bfd_get_arch_info (info
->abfd
);
706 if (info
->bfd_arch_info
== NULL
708 info
->bfd_arch_info
= gdbarch_bfd_arch_info (gdbarch
);
710 /* "(gdb) set byte-order ...". */
711 if (info
->byte_order
== BFD_ENDIAN_UNKNOWN
712 && !target_byte_order_auto
714 info
->byte_order
= gdbarch_byte_order (gdbarch
);
715 /* From the INFO struct. */
716 if (info
->byte_order
== BFD_ENDIAN_UNKNOWN
717 && info
->abfd
!= NULL
)
718 info
->byte_order
= (bfd_big_endian (info
->abfd
) ? BFD_ENDIAN_BIG
719 : bfd_little_endian (info
->abfd
) ? BFD_ENDIAN_LITTLE
720 : BFD_ENDIAN_UNKNOWN
);
721 /* From the current target. */
722 if (info
->byte_order
== BFD_ENDIAN_UNKNOWN
724 info
->byte_order
= gdbarch_byte_order (gdbarch
);
726 /* "(gdb) set osabi ...". Handled by gdbarch_lookup_osabi. */
727 if (info
->osabi
== GDB_OSABI_UNINITIALIZED
)
728 info
->osabi
= gdbarch_lookup_osabi (info
->abfd
);
729 if (info
->osabi
== GDB_OSABI_UNINITIALIZED
731 info
->osabi
= gdbarch_osabi (gdbarch
);
733 /* Must have at least filled in the architecture. */
734 gdb_assert (info
->bfd_arch_info
!= NULL
);
739 extern initialize_file_ftype _initialize_gdbarch_utils
; /* -Wmissing-prototypes */
742 _initialize_gdbarch_utils (void)
744 struct cmd_list_element
*c
;
745 c
= add_set_enum_cmd ("endian", class_support
,
746 endian_enum
, &set_endian_string
,
747 "Set endianness of target.",
749 set_cmd_sfunc (c
, set_endian
);
750 /* Don't use set_from_show - need to print both auto/manual and
752 add_cmd ("endian", class_support
, show_endian
,
753 "Show the current byte-order", &showlist
);