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
);
149 /* New/multi-arched targets should use the correct gdbarch field
150 instead of using this global pointer. */
152 legacy_print_insn (bfd_vma vma
, disassemble_info
*info
)
154 return (*tm_print_insn
) (vma
, info
);
157 /* Helper functions for INNER_THAN */
160 core_addr_lessthan (CORE_ADDR lhs
, CORE_ADDR rhs
)
166 core_addr_greaterthan (CORE_ADDR lhs
, CORE_ADDR rhs
)
172 /* Helper functions for TARGET_{FLOAT,DOUBLE}_FORMAT */
174 const struct floatformat
*
175 default_float_format (struct gdbarch
*gdbarch
)
178 int byte_order
= gdbarch_byte_order (gdbarch
);
180 int byte_order
= TARGET_BYTE_ORDER
;
185 return &floatformat_ieee_single_big
;
187 return &floatformat_ieee_single_little
;
189 internal_error (__FILE__
, __LINE__
,
190 "default_float_format: bad byte order");
195 const struct floatformat
*
196 default_double_format (struct gdbarch
*gdbarch
)
199 int byte_order
= gdbarch_byte_order (gdbarch
);
201 int byte_order
= TARGET_BYTE_ORDER
;
206 return &floatformat_ieee_double_big
;
208 return &floatformat_ieee_double_little
;
210 internal_error (__FILE__
, __LINE__
,
211 "default_double_format: bad byte order");
215 /* Misc helper functions for targets. */
218 frame_num_args_unknown (struct frame_info
*fi
)
225 generic_register_convertible_not (int num
)
232 default_register_sim_regno (int num
)
239 core_addr_identity (CORE_ADDR addr
)
245 no_op_reg_to_regnum (int reg
)
250 /* For use by frame_args_address and frame_locals_address. */
252 default_frame_address (struct frame_info
*fi
)
257 /* Default prepare_to_procced(). */
259 default_prepare_to_proceed (int select_it
)
264 /* Generic prepare_to_proceed(). This one should be suitable for most
265 targets that support threads. */
267 generic_prepare_to_proceed (int select_it
)
270 struct target_waitstatus wait_status
;
272 /* Get the last target status returned by target_wait(). */
273 get_last_target_status (&wait_ptid
, &wait_status
);
275 /* Make sure we were stopped either at a breakpoint, or because
277 if (wait_status
.kind
!= TARGET_WAITKIND_STOPPED
278 || (wait_status
.value
.sig
!= TARGET_SIGNAL_TRAP
&&
279 wait_status
.value
.sig
!= TARGET_SIGNAL_INT
))
284 if (!ptid_equal (wait_ptid
, minus_one_ptid
)
285 && !ptid_equal (inferior_ptid
, wait_ptid
))
287 /* Switched over from WAIT_PID. */
288 CORE_ADDR wait_pc
= read_pc_pid (wait_ptid
);
290 if (wait_pc
!= read_pc ())
294 /* Switch back to WAIT_PID thread. */
295 inferior_ptid
= wait_ptid
;
297 /* FIXME: This stuff came from switch_to_thread() in
298 thread.c (which should probably be a public function). */
299 flush_cached_frames ();
300 registers_changed ();
302 select_frame (get_current_frame (), 0);
304 /* We return 1 to indicate that there is a breakpoint here,
305 so we need to step over it before continuing to avoid
306 hitting it straight away. */
307 if (breakpoint_here_p (wait_pc
))
318 init_frame_pc_noop (int fromleaf
, struct frame_info
*prev
)
324 init_frame_pc_default (int fromleaf
, struct frame_info
*prev
)
327 prev
->pc
= SAVED_PC_AFTER_CALL (prev
->next
);
328 else if (prev
->next
!= NULL
)
329 prev
->pc
= FRAME_SAVED_PC (prev
->next
);
331 prev
->pc
= read_pc ();
335 cannot_register_not (int regnum
)
340 /* Legacy version of target_virtual_frame_pointer(). Assumes that
341 there is an FP_REGNUM and that it is the same, cooked or raw. */
344 legacy_virtual_frame_pointer (CORE_ADDR pc
,
346 LONGEST
*frame_offset
)
348 gdb_assert (FP_REGNUM
>= 0);
349 *frame_regnum
= FP_REGNUM
;
353 /* Functions to manipulate the endianness of the target. */
355 #ifdef TARGET_BYTE_ORDER_SELECTABLE
356 /* compat - Catch old targets that expect a selectable byte-order to
357 default to BIG_ENDIAN */
358 #ifndef TARGET_BYTE_ORDER_DEFAULT
359 #define TARGET_BYTE_ORDER_DEFAULT BIG_ENDIAN
362 #if !TARGET_BYTE_ORDER_SELECTABLE_P
363 #ifndef TARGET_BYTE_ORDER_DEFAULT
364 /* compat - Catch old non byte-order selectable targets that do not
365 define TARGET_BYTE_ORDER_DEFAULT and instead expect
366 TARGET_BYTE_ORDER to be used as the default. For targets that
367 defined neither TARGET_BYTE_ORDER nor TARGET_BYTE_ORDER_DEFAULT the
368 below will get a strange compiler warning. */
369 #define TARGET_BYTE_ORDER_DEFAULT TARGET_BYTE_ORDER
372 #ifndef TARGET_BYTE_ORDER_DEFAULT
373 #define TARGET_BYTE_ORDER_DEFAULT BIG_ENDIAN /* arbitrary */
375 /* ``target_byte_order'' is only used when non- multi-arch.
376 Multi-arch targets obtain the current byte order using
377 TARGET_BYTE_ORDER which is controlled by gdbarch.*. */
378 int target_byte_order
= TARGET_BYTE_ORDER_DEFAULT
;
379 int target_byte_order_auto
= 1;
381 static const char endian_big
[] = "big";
382 static const char endian_little
[] = "little";
383 static const char endian_auto
[] = "auto";
384 static const char *endian_enum
[] =
391 static const char *set_endian_string
;
393 /* Called by ``show endian''. */
396 show_endian (char *args
, int from_tty
)
398 if (TARGET_BYTE_ORDER_AUTO
)
399 printf_unfiltered ("The target endianness is set automatically (currently %s endian)\n",
400 (TARGET_BYTE_ORDER
== BIG_ENDIAN
? "big" : "little"));
402 printf_unfiltered ("The target is assumed to be %s endian\n",
403 (TARGET_BYTE_ORDER
== BIG_ENDIAN
? "big" : "little"));
407 set_endian (char *ignore_args
, int from_tty
, struct cmd_list_element
*c
)
409 if (!TARGET_BYTE_ORDER_SELECTABLE_P
)
411 printf_unfiltered ("Byte order is not selectable.");
413 else if (set_endian_string
== endian_auto
)
415 target_byte_order_auto
= 1;
417 else if (set_endian_string
== endian_little
)
419 target_byte_order_auto
= 0;
422 struct gdbarch_info info
;
423 memset (&info
, 0, sizeof info
);
424 info
.byte_order
= LITTLE_ENDIAN
;
425 if (! gdbarch_update_p (info
))
427 printf_unfiltered ("Little endian target not supported by GDB\n");
432 target_byte_order
= LITTLE_ENDIAN
;
435 else if (set_endian_string
== endian_big
)
437 target_byte_order_auto
= 0;
440 struct gdbarch_info info
;
441 memset (&info
, 0, sizeof info
);
442 info
.byte_order
= BIG_ENDIAN
;
443 if (! gdbarch_update_p (info
))
445 printf_unfiltered ("Big endian target not supported by GDB\n");
450 target_byte_order
= BIG_ENDIAN
;
454 internal_error (__FILE__
, __LINE__
,
455 "set_endian: bad value");
456 show_endian (NULL
, from_tty
);
459 /* Set the endianness from a BFD. */
462 set_endian_from_file (bfd
*abfd
)
465 internal_error (__FILE__
, __LINE__
,
466 "set_endian_from_file: not for multi-arch");
467 if (TARGET_BYTE_ORDER_SELECTABLE_P
)
471 if (bfd_big_endian (abfd
))
474 want
= LITTLE_ENDIAN
;
475 if (TARGET_BYTE_ORDER_AUTO
)
476 target_byte_order
= want
;
477 else if (TARGET_BYTE_ORDER
!= want
)
478 warning ("%s endian file does not match %s endian target.",
479 want
== BIG_ENDIAN
? "big" : "little",
480 TARGET_BYTE_ORDER
== BIG_ENDIAN
? "big" : "little");
484 if (bfd_big_endian (abfd
)
485 ? TARGET_BYTE_ORDER
!= BIG_ENDIAN
486 : TARGET_BYTE_ORDER
== BIG_ENDIAN
)
487 warning ("%s endian file does not match %s endian target.",
488 bfd_big_endian (abfd
) ? "big" : "little",
489 TARGET_BYTE_ORDER
== BIG_ENDIAN
? "big" : "little");
494 /* Functions to manipulate the architecture of the target */
496 enum set_arch
{ set_arch_auto
, set_arch_manual
};
498 int target_architecture_auto
= 1;
500 const char *set_architecture_string
;
502 /* Old way of changing the current architecture. */
504 extern const struct bfd_arch_info bfd_default_arch_struct
;
505 const struct bfd_arch_info
*target_architecture
= &bfd_default_arch_struct
;
506 int (*target_architecture_hook
) (const struct bfd_arch_info
*ap
);
509 arch_ok (const struct bfd_arch_info
*arch
)
512 internal_error (__FILE__
, __LINE__
,
513 "arch_ok: not multi-arched");
514 /* Should be performing the more basic check that the binary is
515 compatible with GDB. */
516 /* Check with the target that the architecture is valid. */
517 return (target_architecture_hook
== NULL
518 || target_architecture_hook (arch
));
522 set_arch (const struct bfd_arch_info
*arch
,
526 internal_error (__FILE__
, __LINE__
,
527 "set_arch: not multi-arched");
532 warning ("Target may not support %s architecture",
533 arch
->printable_name
);
534 target_architecture
= arch
;
536 case set_arch_manual
:
539 printf_unfiltered ("Target does not support `%s' architecture.\n",
540 arch
->printable_name
);
544 target_architecture_auto
= 0;
545 target_architecture
= arch
;
550 gdbarch_dump (current_gdbarch
, gdb_stdlog
);
553 /* Set the architecture from arch/machine (deprecated) */
556 set_architecture_from_arch_mach (enum bfd_architecture arch
,
559 const struct bfd_arch_info
*wanted
= bfd_lookup_arch (arch
, mach
);
561 internal_error (__FILE__
, __LINE__
,
562 "set_architecture_from_arch_mach: not multi-arched");
564 set_arch (wanted
, set_arch_manual
);
566 internal_error (__FILE__
, __LINE__
,
567 "gdbarch: hardwired architecture/machine not recognized");
570 /* Set the architecture from a BFD (deprecated) */
573 set_architecture_from_file (bfd
*abfd
)
575 const struct bfd_arch_info
*wanted
= bfd_get_arch_info (abfd
);
577 internal_error (__FILE__
, __LINE__
,
578 "set_architecture_from_file: not multi-arched");
579 if (target_architecture_auto
)
581 set_arch (wanted
, set_arch_auto
);
583 else if (wanted
!= target_architecture
)
585 warning ("%s architecture file may be incompatible with %s target.",
586 wanted
->printable_name
,
587 target_architecture
->printable_name
);
592 /* Called if the user enters ``show architecture'' without an
596 show_architecture (char *args
, int from_tty
)
599 arch
= TARGET_ARCHITECTURE
->printable_name
;
600 if (target_architecture_auto
)
601 printf_filtered ("The target architecture is set automatically (currently %s)\n", arch
);
603 printf_filtered ("The target architecture is assumed to be %s\n", arch
);
607 /* Called if the user enters ``set architecture'' with or without an
611 set_architecture (char *ignore_args
, int from_tty
, struct cmd_list_element
*c
)
613 if (strcmp (set_architecture_string
, "auto") == 0)
615 target_architecture_auto
= 1;
617 else if (GDB_MULTI_ARCH
)
619 struct gdbarch_info info
;
620 memset (&info
, 0, sizeof info
);
621 info
.bfd_arch_info
= bfd_scan_arch (set_architecture_string
);
622 if (info
.bfd_arch_info
== NULL
)
623 internal_error (__FILE__
, __LINE__
,
624 "set_architecture: bfd_scan_arch failed");
625 if (gdbarch_update_p (info
))
626 target_architecture_auto
= 0;
628 printf_unfiltered ("Architecture `%s' not recognized.\n",
629 set_architecture_string
);
633 const struct bfd_arch_info
*arch
634 = bfd_scan_arch (set_architecture_string
);
636 internal_error (__FILE__
, __LINE__
,
637 "set_architecture: bfd_scan_arch failed");
638 set_arch (arch
, set_arch_manual
);
640 show_architecture (NULL
, from_tty
);
643 /* Set the dynamic target-system-dependent parameters (architecture,
644 byte-order) using information found in the BFD */
647 set_gdbarch_from_file (bfd
*abfd
)
651 struct gdbarch_info info
;
652 memset (&info
, 0, sizeof info
);
654 if (! gdbarch_update_p (info
))
655 error ("Architecture of file not recognized.\n");
659 set_architecture_from_file (abfd
);
660 set_endian_from_file (abfd
);
664 /* Initialize the current architecture. Update the ``set
665 architecture'' command so that it specifies a list of valid
668 #ifdef DEFAULT_BFD_ARCH
669 extern const bfd_arch_info_type DEFAULT_BFD_ARCH
;
670 static const bfd_arch_info_type
*default_bfd_arch
= &DEFAULT_BFD_ARCH
;
672 static const bfd_arch_info_type
*default_bfd_arch
;
675 #ifdef DEFAULT_BFD_VEC
676 extern const bfd_target DEFAULT_BFD_VEC
;
677 static const bfd_target
*default_bfd_vec
= &DEFAULT_BFD_VEC
;
679 static const bfd_target
*default_bfd_vec
;
683 initialize_current_architecture (void)
685 const char **arches
= gdbarch_printable_names ();
687 /* determine a default architecture and byte order. */
688 struct gdbarch_info info
;
689 memset (&info
, 0, sizeof (info
));
691 /* Find a default architecture. */
692 if (info
.bfd_arch_info
== NULL
693 && default_bfd_arch
!= NULL
)
694 info
.bfd_arch_info
= default_bfd_arch
;
695 if (info
.bfd_arch_info
== NULL
)
697 /* Choose the architecture by taking the first one
699 const char *chosen
= arches
[0];
701 for (arch
= arches
; *arch
!= NULL
; arch
++)
703 if (strcmp (*arch
, chosen
) < 0)
707 internal_error (__FILE__
, __LINE__
,
708 "initialize_current_architecture: No arch");
709 info
.bfd_arch_info
= bfd_scan_arch (chosen
);
710 if (info
.bfd_arch_info
== NULL
)
711 internal_error (__FILE__
, __LINE__
,
712 "initialize_current_architecture: Arch not found");
715 /* take several guesses at a byte order. */
716 /* NB: can't use TARGET_BYTE_ORDER_DEFAULT as its definition is
718 if (info
.byte_order
== 0
719 && default_bfd_vec
!= NULL
)
721 /* Extract BFD's default vector's byte order. */
722 switch (default_bfd_vec
->byteorder
)
725 info
.byte_order
= BIG_ENDIAN
;
727 case BFD_ENDIAN_LITTLE
:
728 info
.byte_order
= LITTLE_ENDIAN
;
734 if (info
.byte_order
== 0)
736 /* look for ``*el-*'' in the target name. */
738 chp
= strchr (target_name
, '-');
740 && chp
- 2 >= target_name
741 && strncmp (chp
- 2, "el", 2) == 0)
742 info
.byte_order
= LITTLE_ENDIAN
;
744 if (info
.byte_order
== 0)
746 /* Wire it to big-endian!!! */
747 info
.byte_order
= BIG_ENDIAN
;
752 if (! gdbarch_update_p (info
))
754 internal_error (__FILE__
, __LINE__
,
755 "initialize_current_architecture: Selection of initial architecture failed");
759 initialize_non_multiarch ();
761 /* Create the ``set architecture'' command appending ``auto'' to the
762 list of architectures. */
764 struct cmd_list_element
*c
;
765 /* Append ``auto''. */
767 for (nr
= 0; arches
[nr
] != NULL
; nr
++);
768 arches
= xrealloc (arches
, sizeof (char*) * (nr
+ 2));
769 arches
[nr
+ 0] = "auto";
770 arches
[nr
+ 1] = NULL
;
771 /* FIXME: add_set_enum_cmd() uses an array of ``char *'' instead
772 of ``const char *''. We just happen to know that the casts are
774 c
= add_set_enum_cmd ("architecture", class_support
,
775 arches
, &set_architecture_string
,
776 "Set architecture of target.",
778 c
->function
.sfunc
= set_architecture
;
779 add_alias_cmd ("processor", "architecture", class_support
, 1, &setlist
);
780 /* Don't use set_from_show - need to print both auto/manual and
782 add_cmd ("architecture", class_support
, show_architecture
,
783 "Show the current target architecture", &showlist
);
790 extern initialize_file_ftype _initialize_gdbarch_utils
;
793 _initialize_gdbarch_utils (void)
795 struct cmd_list_element
*c
;
796 c
= add_set_enum_cmd ("endian", class_support
,
797 endian_enum
, &set_endian_string
,
798 "Set endianness of target.",
800 c
->function
.sfunc
= set_endian
;
801 /* Don't use set_from_show - need to print both auto/manual and
803 add_cmd ("endian", class_support
, show_endian
,
804 "Show the current byte-order", &showlist
);