1 /* Dynamic architecture support for GDB, the GNU debugger.
2 Copyright 1998, 1999, 2000, 2001 Free Software Foundation, Inc.
4 This file is part of GDB.
6 This program is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 2 of the License, or
9 (at your option) any later version.
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with this program; if not, write to the Free Software
18 Foundation, Inc., 59 Temple Place - Suite 330,
19 Boston, MA 02111-1307, USA. */
25 #include "inferior.h" /* enum CALL_DUMMY_LOCATION et.al. */
27 /* Just include everything in sight so that the every old definition
28 of macro is visible. */
29 #include "gdb_string.h"
33 #include "breakpoint.h"
41 #include "gdb_assert.h"
45 #include "floatformat.h"
47 /* Use the program counter to determine the contents and size
48 of a breakpoint instruction. If no target-dependent macro
49 BREAKPOINT_FROM_PC has been defined to implement this function,
50 assume that the breakpoint doesn't depend on the PC, and
51 use the values of the BIG_BREAKPOINT and LITTLE_BREAKPOINT macros.
52 Return a pointer to a string of bytes that encode a breakpoint
53 instruction, stores the length of the string to *lenptr,
54 and optionally adjust the pc to point to the correct memory location
55 for inserting the breakpoint. */
58 legacy_breakpoint_from_pc (CORE_ADDR
* pcptr
, int *lenptr
)
60 /* {BIG_,LITTLE_}BREAKPOINT is the sequence of bytes we insert for a
61 breakpoint. On some machines, breakpoints are handled by the
62 target environment and we don't have to worry about them here. */
64 if (TARGET_BYTE_ORDER
== BIG_ENDIAN
)
66 static unsigned char big_break_insn
[] = BIG_BREAKPOINT
;
67 *lenptr
= sizeof (big_break_insn
);
68 return big_break_insn
;
71 #ifdef LITTLE_BREAKPOINT
72 if (TARGET_BYTE_ORDER
!= BIG_ENDIAN
)
74 static unsigned char little_break_insn
[] = LITTLE_BREAKPOINT
;
75 *lenptr
= sizeof (little_break_insn
);
76 return little_break_insn
;
81 static unsigned char break_insn
[] = BREAKPOINT
;
82 *lenptr
= sizeof (break_insn
);
91 generic_frameless_function_invocation_not (struct frame_info
*fi
)
97 generic_return_value_on_stack_not (struct type
*type
)
103 generic_skip_trampoline_code (CORE_ADDR pc
)
109 legacy_register_name (int i
)
111 #ifdef REGISTER_NAMES
112 static char *names
[] = REGISTER_NAMES
;
113 if (i
< 0 || i
>= (sizeof (names
) / sizeof (*names
)))
118 internal_error (__FILE__
, __LINE__
,
119 "legacy_register_name: called.");
124 #if defined (CALL_DUMMY)
125 LONGEST legacy_call_dummy_words
[] = CALL_DUMMY
;
127 LONGEST legacy_call_dummy_words
[1];
129 int legacy_sizeof_call_dummy_words
= sizeof (legacy_call_dummy_words
);
132 generic_remote_translate_xfer_address (CORE_ADDR gdb_addr
, int gdb_len
,
133 CORE_ADDR
* rem_addr
, int *rem_len
)
135 *rem_addr
= gdb_addr
;
140 generic_prologue_frameless_p (CORE_ADDR ip
)
142 #ifdef SKIP_PROLOGUE_FRAMELESS_P
143 return ip
== SKIP_PROLOGUE_FRAMELESS_P (ip
);
145 return ip
== SKIP_PROLOGUE (ip
);
150 /* Helper functions for INNER_THAN */
153 core_addr_lessthan (CORE_ADDR lhs
, CORE_ADDR rhs
)
159 core_addr_greaterthan (CORE_ADDR lhs
, CORE_ADDR rhs
)
165 /* Helper functions for TARGET_{FLOAT,DOUBLE}_FORMAT */
167 const struct floatformat
*
168 default_float_format (struct gdbarch
*gdbarch
)
171 int byte_order
= gdbarch_byte_order (gdbarch
);
173 int byte_order
= TARGET_BYTE_ORDER
;
178 return &floatformat_ieee_single_big
;
180 return &floatformat_ieee_single_little
;
182 internal_error (__FILE__
, __LINE__
,
183 "default_float_format: bad byte order");
188 const struct floatformat
*
189 default_double_format (struct gdbarch
*gdbarch
)
192 int byte_order
= gdbarch_byte_order (gdbarch
);
194 int byte_order
= TARGET_BYTE_ORDER
;
199 return &floatformat_ieee_double_big
;
201 return &floatformat_ieee_double_little
;
203 internal_error (__FILE__
, __LINE__
,
204 "default_double_format: bad byte order");
208 /* Misc helper functions for targets. */
211 frame_num_args_unknown (struct frame_info
*fi
)
218 generic_register_convertible_not (int num
)
225 default_register_sim_regno (int num
)
232 core_addr_identity (CORE_ADDR addr
)
238 no_op_reg_to_regnum (int reg
)
243 /* For use by frame_args_address and frame_locals_address. */
245 default_frame_address (struct frame_info
*fi
)
250 /* Default prepare_to_procced(). */
252 default_prepare_to_proceed (int select_it
)
257 /* Generic prepare_to_proceed(). This one should be suitable for most
258 targets that support threads. */
260 generic_prepare_to_proceed (int select_it
)
263 struct target_waitstatus wait_status
;
265 /* Get the last target status returned by target_wait(). */
266 get_last_target_status (&wait_ptid
, &wait_status
);
268 /* Make sure we were stopped either at a breakpoint, or because
270 if (wait_status
.kind
!= TARGET_WAITKIND_STOPPED
271 || (wait_status
.value
.sig
!= TARGET_SIGNAL_TRAP
&&
272 wait_status
.value
.sig
!= TARGET_SIGNAL_INT
))
277 if (!ptid_equal (wait_ptid
, minus_one_ptid
)
278 && !ptid_equal (inferior_ptid
, wait_ptid
))
280 /* Switched over from WAIT_PID. */
281 CORE_ADDR wait_pc
= read_pc_pid (wait_ptid
);
283 if (wait_pc
!= read_pc ())
287 /* Switch back to WAIT_PID thread. */
288 inferior_ptid
= wait_ptid
;
290 /* FIXME: This stuff came from switch_to_thread() in
291 thread.c (which should probably be a public function). */
292 flush_cached_frames ();
293 registers_changed ();
295 select_frame (get_current_frame (), 0);
297 /* We return 1 to indicate that there is a breakpoint here,
298 so we need to step over it before continuing to avoid
299 hitting it straight away. */
300 if (breakpoint_here_p (wait_pc
))
311 init_frame_pc_noop (int fromleaf
, struct frame_info
*prev
)
317 init_frame_pc_default (int fromleaf
, struct frame_info
*prev
)
320 prev
->pc
= SAVED_PC_AFTER_CALL (prev
->next
);
321 else if (prev
->next
!= NULL
)
322 prev
->pc
= FRAME_SAVED_PC (prev
->next
);
324 prev
->pc
= read_pc ();
328 cannot_register_not (int regnum
)
333 /* Legacy version of target_virtual_frame_pointer(). Assumes that
334 there is an FP_REGNUM and that it is the same, cooked or raw. */
337 legacy_virtual_frame_pointer (CORE_ADDR pc
,
339 LONGEST
*frame_offset
)
341 gdb_assert (FP_REGNUM
>= 0);
342 *frame_regnum
= FP_REGNUM
;
346 /* Functions to manipulate the endianness of the target. */
348 #ifdef TARGET_BYTE_ORDER_SELECTABLE
349 /* compat - Catch old targets that expect a selectable byte-order to
350 default to BIG_ENDIAN */
351 #ifndef TARGET_BYTE_ORDER_DEFAULT
352 #define TARGET_BYTE_ORDER_DEFAULT BIG_ENDIAN
355 #if !TARGET_BYTE_ORDER_SELECTABLE_P
356 #ifndef TARGET_BYTE_ORDER_DEFAULT
357 /* compat - Catch old non byte-order selectable targets that do not
358 define TARGET_BYTE_ORDER_DEFAULT and instead expect
359 TARGET_BYTE_ORDER to be used as the default. For targets that
360 defined neither TARGET_BYTE_ORDER nor TARGET_BYTE_ORDER_DEFAULT the
361 below will get a strange compiler warning. */
362 #define TARGET_BYTE_ORDER_DEFAULT TARGET_BYTE_ORDER
365 #ifndef TARGET_BYTE_ORDER_DEFAULT
366 #define TARGET_BYTE_ORDER_DEFAULT BIG_ENDIAN /* arbitrary */
368 /* ``target_byte_order'' is only used when non- multi-arch.
369 Multi-arch targets obtain the current byte order using
370 TARGET_BYTE_ORDER which is controlled by gdbarch.*. */
371 int target_byte_order
= TARGET_BYTE_ORDER_DEFAULT
;
372 int target_byte_order_auto
= 1;
374 static const char endian_big
[] = "big";
375 static const char endian_little
[] = "little";
376 static const char endian_auto
[] = "auto";
377 static const char *endian_enum
[] =
384 static const char *set_endian_string
;
386 /* Called by ``show endian''. */
389 show_endian (char *args
, int from_tty
)
391 if (TARGET_BYTE_ORDER_AUTO
)
392 printf_unfiltered ("The target endianness is set automatically (currently %s endian)\n",
393 (TARGET_BYTE_ORDER
== BIG_ENDIAN
? "big" : "little"));
395 printf_unfiltered ("The target is assumed to be %s endian\n",
396 (TARGET_BYTE_ORDER
== BIG_ENDIAN
? "big" : "little"));
400 set_endian (char *ignore_args
, int from_tty
, struct cmd_list_element
*c
)
402 if (!TARGET_BYTE_ORDER_SELECTABLE_P
)
404 printf_unfiltered ("Byte order is not selectable.");
406 else if (set_endian_string
== endian_auto
)
408 target_byte_order_auto
= 1;
410 else if (set_endian_string
== endian_little
)
412 target_byte_order_auto
= 0;
415 struct gdbarch_info info
;
416 memset (&info
, 0, sizeof info
);
417 info
.byte_order
= LITTLE_ENDIAN
;
418 if (! gdbarch_update_p (info
))
420 printf_unfiltered ("Little endian target not supported by GDB\n");
425 target_byte_order
= LITTLE_ENDIAN
;
428 else if (set_endian_string
== endian_big
)
430 target_byte_order_auto
= 0;
433 struct gdbarch_info info
;
434 memset (&info
, 0, sizeof info
);
435 info
.byte_order
= BIG_ENDIAN
;
436 if (! gdbarch_update_p (info
))
438 printf_unfiltered ("Big endian target not supported by GDB\n");
443 target_byte_order
= BIG_ENDIAN
;
447 internal_error (__FILE__
, __LINE__
,
448 "set_endian: bad value");
449 show_endian (NULL
, from_tty
);
452 /* Set the endianness from a BFD. */
455 set_endian_from_file (bfd
*abfd
)
458 internal_error (__FILE__
, __LINE__
,
459 "set_endian_from_file: not for multi-arch");
460 if (TARGET_BYTE_ORDER_SELECTABLE_P
)
464 if (bfd_big_endian (abfd
))
467 want
= LITTLE_ENDIAN
;
468 if (TARGET_BYTE_ORDER_AUTO
)
469 target_byte_order
= want
;
470 else if (TARGET_BYTE_ORDER
!= want
)
471 warning ("%s endian file does not match %s endian target.",
472 want
== BIG_ENDIAN
? "big" : "little",
473 TARGET_BYTE_ORDER
== BIG_ENDIAN
? "big" : "little");
477 if (bfd_big_endian (abfd
)
478 ? TARGET_BYTE_ORDER
!= BIG_ENDIAN
479 : TARGET_BYTE_ORDER
== BIG_ENDIAN
)
480 warning ("%s endian file does not match %s endian target.",
481 bfd_big_endian (abfd
) ? "big" : "little",
482 TARGET_BYTE_ORDER
== BIG_ENDIAN
? "big" : "little");
487 /* Functions to manipulate the architecture of the target */
489 enum set_arch
{ set_arch_auto
, set_arch_manual
};
491 int target_architecture_auto
= 1;
493 const char *set_architecture_string
;
495 /* Old way of changing the current architecture. */
497 extern const struct bfd_arch_info bfd_default_arch_struct
;
498 const struct bfd_arch_info
*target_architecture
= &bfd_default_arch_struct
;
499 int (*target_architecture_hook
) (const struct bfd_arch_info
*ap
);
502 arch_ok (const struct bfd_arch_info
*arch
)
505 internal_error (__FILE__
, __LINE__
,
506 "arch_ok: not multi-arched");
507 /* Should be performing the more basic check that the binary is
508 compatible with GDB. */
509 /* Check with the target that the architecture is valid. */
510 return (target_architecture_hook
== NULL
511 || target_architecture_hook (arch
));
515 set_arch (const struct bfd_arch_info
*arch
,
519 internal_error (__FILE__
, __LINE__
,
520 "set_arch: not multi-arched");
525 warning ("Target may not support %s architecture",
526 arch
->printable_name
);
527 target_architecture
= arch
;
529 case set_arch_manual
:
532 printf_unfiltered ("Target does not support `%s' architecture.\n",
533 arch
->printable_name
);
537 target_architecture_auto
= 0;
538 target_architecture
= arch
;
543 gdbarch_dump (current_gdbarch
, gdb_stdlog
);
546 /* Set the architecture from arch/machine (deprecated) */
549 set_architecture_from_arch_mach (enum bfd_architecture arch
,
552 const struct bfd_arch_info
*wanted
= bfd_lookup_arch (arch
, mach
);
554 internal_error (__FILE__
, __LINE__
,
555 "set_architecture_from_arch_mach: not multi-arched");
557 set_arch (wanted
, set_arch_manual
);
559 internal_error (__FILE__
, __LINE__
,
560 "gdbarch: hardwired architecture/machine not recognized");
563 /* Set the architecture from a BFD (deprecated) */
566 set_architecture_from_file (bfd
*abfd
)
568 const struct bfd_arch_info
*wanted
= bfd_get_arch_info (abfd
);
570 internal_error (__FILE__
, __LINE__
,
571 "set_architecture_from_file: not multi-arched");
572 if (target_architecture_auto
)
574 set_arch (wanted
, set_arch_auto
);
576 else if (wanted
!= target_architecture
)
578 warning ("%s architecture file may be incompatible with %s target.",
579 wanted
->printable_name
,
580 target_architecture
->printable_name
);
585 /* Called if the user enters ``show architecture'' without an
589 show_architecture (char *args
, int from_tty
)
592 arch
= TARGET_ARCHITECTURE
->printable_name
;
593 if (target_architecture_auto
)
594 printf_filtered ("The target architecture is set automatically (currently %s)\n", arch
);
596 printf_filtered ("The target architecture is assumed to be %s\n", arch
);
600 /* Called if the user enters ``set architecture'' with or without an
604 set_architecture (char *ignore_args
, int from_tty
, struct cmd_list_element
*c
)
606 if (strcmp (set_architecture_string
, "auto") == 0)
608 target_architecture_auto
= 1;
610 else if (GDB_MULTI_ARCH
)
612 struct gdbarch_info info
;
613 memset (&info
, 0, sizeof info
);
614 info
.bfd_arch_info
= bfd_scan_arch (set_architecture_string
);
615 if (info
.bfd_arch_info
== NULL
)
616 internal_error (__FILE__
, __LINE__
,
617 "set_architecture: bfd_scan_arch failed");
618 if (gdbarch_update_p (info
))
619 target_architecture_auto
= 0;
621 printf_unfiltered ("Architecture `%s' not recognized.\n",
622 set_architecture_string
);
626 const struct bfd_arch_info
*arch
627 = bfd_scan_arch (set_architecture_string
);
629 internal_error (__FILE__
, __LINE__
,
630 "set_architecture: bfd_scan_arch failed");
631 set_arch (arch
, set_arch_manual
);
633 show_architecture (NULL
, from_tty
);
636 /* Set the dynamic target-system-dependent parameters (architecture,
637 byte-order) using information found in the BFD */
640 set_gdbarch_from_file (bfd
*abfd
)
644 struct gdbarch_info info
;
645 memset (&info
, 0, sizeof info
);
647 if (! gdbarch_update_p (info
))
648 error ("Architecture of file not recognized.\n");
652 set_architecture_from_file (abfd
);
653 set_endian_from_file (abfd
);
657 /* Initialize the current architecture. Update the ``set
658 architecture'' command so that it specifies a list of valid
661 #ifdef DEFAULT_BFD_ARCH
662 extern const bfd_arch_info_type DEFAULT_BFD_ARCH
;
663 static const bfd_arch_info_type
*default_bfd_arch
= &DEFAULT_BFD_ARCH
;
665 static const bfd_arch_info_type
*default_bfd_arch
;
668 #ifdef DEFAULT_BFD_VEC
669 extern const bfd_target DEFAULT_BFD_VEC
;
670 static const bfd_target
*default_bfd_vec
= &DEFAULT_BFD_VEC
;
672 static const bfd_target
*default_bfd_vec
;
676 initialize_current_architecture (void)
678 const char **arches
= gdbarch_printable_names ();
680 /* determine a default architecture and byte order. */
681 struct gdbarch_info info
;
682 memset (&info
, 0, sizeof (info
));
684 /* Find a default architecture. */
685 if (info
.bfd_arch_info
== NULL
686 && default_bfd_arch
!= NULL
)
687 info
.bfd_arch_info
= default_bfd_arch
;
688 if (info
.bfd_arch_info
== NULL
)
690 /* Choose the architecture by taking the first one
692 const char *chosen
= arches
[0];
694 for (arch
= arches
; *arch
!= NULL
; arch
++)
696 if (strcmp (*arch
, chosen
) < 0)
700 internal_error (__FILE__
, __LINE__
,
701 "initialize_current_architecture: No arch");
702 info
.bfd_arch_info
= bfd_scan_arch (chosen
);
703 if (info
.bfd_arch_info
== NULL
)
704 internal_error (__FILE__
, __LINE__
,
705 "initialize_current_architecture: Arch not found");
708 /* take several guesses at a byte order. */
709 /* NB: can't use TARGET_BYTE_ORDER_DEFAULT as its definition is
711 if (info
.byte_order
== 0
712 && default_bfd_vec
!= NULL
)
714 /* Extract BFD's default vector's byte order. */
715 switch (default_bfd_vec
->byteorder
)
718 info
.byte_order
= BIG_ENDIAN
;
720 case BFD_ENDIAN_LITTLE
:
721 info
.byte_order
= LITTLE_ENDIAN
;
727 if (info
.byte_order
== 0)
729 /* look for ``*el-*'' in the target name. */
731 chp
= strchr (target_name
, '-');
733 && chp
- 2 >= target_name
734 && strncmp (chp
- 2, "el", 2) == 0)
735 info
.byte_order
= LITTLE_ENDIAN
;
737 if (info
.byte_order
== 0)
739 /* Wire it to big-endian!!! */
740 info
.byte_order
= BIG_ENDIAN
;
745 if (! gdbarch_update_p (info
))
747 internal_error (__FILE__
, __LINE__
,
748 "initialize_current_architecture: Selection of initial architecture failed");
752 initialize_non_multiarch ();
754 /* Create the ``set architecture'' command appending ``auto'' to the
755 list of architectures. */
757 struct cmd_list_element
*c
;
758 /* Append ``auto''. */
760 for (nr
= 0; arches
[nr
] != NULL
; nr
++);
761 arches
= xrealloc (arches
, sizeof (char*) * (nr
+ 2));
762 arches
[nr
+ 0] = "auto";
763 arches
[nr
+ 1] = NULL
;
764 /* FIXME: add_set_enum_cmd() uses an array of ``char *'' instead
765 of ``const char *''. We just happen to know that the casts are
767 c
= add_set_enum_cmd ("architecture", class_support
,
768 arches
, &set_architecture_string
,
769 "Set architecture of target.",
771 c
->function
.sfunc
= set_architecture
;
772 add_alias_cmd ("processor", "architecture", class_support
, 1, &setlist
);
773 /* Don't use set_from_show - need to print both auto/manual and
775 add_cmd ("architecture", class_support
, show_architecture
,
776 "Show the current target architecture", &showlist
);
783 extern initialize_file_ftype _initialize_gdbarch_utils
;
786 _initialize_gdbarch_utils (void)
788 struct cmd_list_element
*c
;
789 c
= add_set_enum_cmd ("endian", class_support
,
790 endian_enum
, &set_endian_string
,
791 "Set endianness of target.",
793 c
->function
.sfunc
= set_endian
;
794 /* Don't use set_from_show - need to print both auto/manual and
796 add_cmd ("endian", class_support
, show_endian
,
797 "Show the current byte-order", &showlist
);