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 generic_in_solib_call_trampoline (CORE_ADDR pc
, char *name
)
115 legacy_register_name (int i
)
117 #ifdef REGISTER_NAMES
118 static char *names
[] = REGISTER_NAMES
;
119 if (i
< 0 || i
>= (sizeof (names
) / sizeof (*names
)))
124 internal_error (__FILE__
, __LINE__
,
125 "legacy_register_name: called.");
130 #if defined (CALL_DUMMY)
131 LONGEST legacy_call_dummy_words
[] = CALL_DUMMY
;
133 LONGEST legacy_call_dummy_words
[1];
135 int legacy_sizeof_call_dummy_words
= sizeof (legacy_call_dummy_words
);
138 generic_remote_translate_xfer_address (CORE_ADDR gdb_addr
, int gdb_len
,
139 CORE_ADDR
* rem_addr
, int *rem_len
)
141 *rem_addr
= gdb_addr
;
146 generic_prologue_frameless_p (CORE_ADDR ip
)
148 #ifdef SKIP_PROLOGUE_FRAMELESS_P
149 return ip
== SKIP_PROLOGUE_FRAMELESS_P (ip
);
151 return ip
== SKIP_PROLOGUE (ip
);
155 /* New/multi-arched targets should use the correct gdbarch field
156 instead of using this global pointer. */
158 legacy_print_insn (bfd_vma vma
, disassemble_info
*info
)
160 return (*tm_print_insn
) (vma
, info
);
163 /* Helper functions for INNER_THAN */
166 core_addr_lessthan (CORE_ADDR lhs
, CORE_ADDR rhs
)
172 core_addr_greaterthan (CORE_ADDR lhs
, CORE_ADDR rhs
)
178 /* Helper functions for TARGET_{FLOAT,DOUBLE}_FORMAT */
180 const struct floatformat
*
181 default_float_format (struct gdbarch
*gdbarch
)
184 int byte_order
= gdbarch_byte_order (gdbarch
);
186 int byte_order
= TARGET_BYTE_ORDER
;
191 return &floatformat_ieee_single_big
;
193 return &floatformat_ieee_single_little
;
195 internal_error (__FILE__
, __LINE__
,
196 "default_float_format: bad byte order");
201 const struct floatformat
*
202 default_double_format (struct gdbarch
*gdbarch
)
205 int byte_order
= gdbarch_byte_order (gdbarch
);
207 int byte_order
= TARGET_BYTE_ORDER
;
212 return &floatformat_ieee_double_big
;
214 return &floatformat_ieee_double_little
;
216 internal_error (__FILE__
, __LINE__
,
217 "default_double_format: bad byte order");
221 /* Misc helper functions for targets. */
224 frame_num_args_unknown (struct frame_info
*fi
)
231 generic_register_convertible_not (int num
)
238 default_register_sim_regno (int num
)
245 core_addr_identity (CORE_ADDR addr
)
251 no_op_reg_to_regnum (int reg
)
256 /* For use by frame_args_address and frame_locals_address. */
258 default_frame_address (struct frame_info
*fi
)
263 /* Default prepare_to_procced(). */
265 default_prepare_to_proceed (int select_it
)
270 /* Generic prepare_to_proceed(). This one should be suitable for most
271 targets that support threads. */
273 generic_prepare_to_proceed (int select_it
)
276 struct target_waitstatus wait_status
;
278 /* Get the last target status returned by target_wait(). */
279 get_last_target_status (&wait_ptid
, &wait_status
);
281 /* Make sure we were stopped either at a breakpoint, or because
283 if (wait_status
.kind
!= TARGET_WAITKIND_STOPPED
284 || (wait_status
.value
.sig
!= TARGET_SIGNAL_TRAP
&&
285 wait_status
.value
.sig
!= TARGET_SIGNAL_INT
))
290 if (!ptid_equal (wait_ptid
, minus_one_ptid
)
291 && !ptid_equal (inferior_ptid
, wait_ptid
))
293 /* Switched over from WAIT_PID. */
294 CORE_ADDR wait_pc
= read_pc_pid (wait_ptid
);
296 if (wait_pc
!= read_pc ())
300 /* Switch back to WAIT_PID thread. */
301 inferior_ptid
= wait_ptid
;
303 /* FIXME: This stuff came from switch_to_thread() in
304 thread.c (which should probably be a public function). */
305 flush_cached_frames ();
306 registers_changed ();
308 select_frame (get_current_frame (), 0);
310 /* We return 1 to indicate that there is a breakpoint here,
311 so we need to step over it before continuing to avoid
312 hitting it straight away. */
313 if (breakpoint_here_p (wait_pc
))
324 init_frame_pc_noop (int fromleaf
, struct frame_info
*prev
)
330 init_frame_pc_default (int fromleaf
, struct frame_info
*prev
)
333 prev
->pc
= SAVED_PC_AFTER_CALL (prev
->next
);
334 else if (prev
->next
!= NULL
)
335 prev
->pc
= FRAME_SAVED_PC (prev
->next
);
337 prev
->pc
= read_pc ();
341 cannot_register_not (int regnum
)
346 /* Legacy version of target_virtual_frame_pointer(). Assumes that
347 there is an FP_REGNUM and that it is the same, cooked or raw. */
350 legacy_virtual_frame_pointer (CORE_ADDR pc
,
352 LONGEST
*frame_offset
)
354 gdb_assert (FP_REGNUM
>= 0);
355 *frame_regnum
= FP_REGNUM
;
359 /* Functions to manipulate the endianness of the target. */
361 #ifdef TARGET_BYTE_ORDER_SELECTABLE
362 /* compat - Catch old targets that expect a selectable byte-order to
363 default to BIG_ENDIAN */
364 #ifndef TARGET_BYTE_ORDER_DEFAULT
365 #define TARGET_BYTE_ORDER_DEFAULT BIG_ENDIAN
368 #if !TARGET_BYTE_ORDER_SELECTABLE_P
369 #ifndef TARGET_BYTE_ORDER_DEFAULT
370 /* compat - Catch old non byte-order selectable targets that do not
371 define TARGET_BYTE_ORDER_DEFAULT and instead expect
372 TARGET_BYTE_ORDER to be used as the default. For targets that
373 defined neither TARGET_BYTE_ORDER nor TARGET_BYTE_ORDER_DEFAULT the
374 below will get a strange compiler warning. */
375 #define TARGET_BYTE_ORDER_DEFAULT TARGET_BYTE_ORDER
378 #ifndef TARGET_BYTE_ORDER_DEFAULT
379 #define TARGET_BYTE_ORDER_DEFAULT BIG_ENDIAN /* arbitrary */
381 /* ``target_byte_order'' is only used when non- multi-arch.
382 Multi-arch targets obtain the current byte order using
383 TARGET_BYTE_ORDER which is controlled by gdbarch.*. */
384 int target_byte_order
= TARGET_BYTE_ORDER_DEFAULT
;
385 int target_byte_order_auto
= 1;
387 static const char endian_big
[] = "big";
388 static const char endian_little
[] = "little";
389 static const char endian_auto
[] = "auto";
390 static const char *endian_enum
[] =
397 static const char *set_endian_string
;
399 /* Called by ``show endian''. */
402 show_endian (char *args
, int from_tty
)
404 if (TARGET_BYTE_ORDER_AUTO
)
405 printf_unfiltered ("The target endianness is set automatically (currently %s endian)\n",
406 (TARGET_BYTE_ORDER
== BIG_ENDIAN
? "big" : "little"));
408 printf_unfiltered ("The target is assumed to be %s endian\n",
409 (TARGET_BYTE_ORDER
== BIG_ENDIAN
? "big" : "little"));
413 set_endian (char *ignore_args
, int from_tty
, struct cmd_list_element
*c
)
415 if (!TARGET_BYTE_ORDER_SELECTABLE_P
)
417 printf_unfiltered ("Byte order is not selectable.");
419 else if (set_endian_string
== endian_auto
)
421 target_byte_order_auto
= 1;
423 else if (set_endian_string
== endian_little
)
425 target_byte_order_auto
= 0;
428 struct gdbarch_info info
;
429 memset (&info
, 0, sizeof info
);
430 info
.byte_order
= LITTLE_ENDIAN
;
431 if (! gdbarch_update_p (info
))
433 printf_unfiltered ("Little endian target not supported by GDB\n");
438 target_byte_order
= LITTLE_ENDIAN
;
441 else if (set_endian_string
== endian_big
)
443 target_byte_order_auto
= 0;
446 struct gdbarch_info info
;
447 memset (&info
, 0, sizeof info
);
448 info
.byte_order
= BIG_ENDIAN
;
449 if (! gdbarch_update_p (info
))
451 printf_unfiltered ("Big endian target not supported by GDB\n");
456 target_byte_order
= BIG_ENDIAN
;
460 internal_error (__FILE__
, __LINE__
,
461 "set_endian: bad value");
462 show_endian (NULL
, from_tty
);
465 /* Set the endianness from a BFD. */
468 set_endian_from_file (bfd
*abfd
)
471 internal_error (__FILE__
, __LINE__
,
472 "set_endian_from_file: not for multi-arch");
473 if (TARGET_BYTE_ORDER_SELECTABLE_P
)
477 if (bfd_big_endian (abfd
))
480 want
= LITTLE_ENDIAN
;
481 if (TARGET_BYTE_ORDER_AUTO
)
482 target_byte_order
= want
;
483 else if (TARGET_BYTE_ORDER
!= want
)
484 warning ("%s endian file does not match %s endian target.",
485 want
== BIG_ENDIAN
? "big" : "little",
486 TARGET_BYTE_ORDER
== BIG_ENDIAN
? "big" : "little");
490 if (bfd_big_endian (abfd
)
491 ? TARGET_BYTE_ORDER
!= BIG_ENDIAN
492 : TARGET_BYTE_ORDER
== BIG_ENDIAN
)
493 warning ("%s endian file does not match %s endian target.",
494 bfd_big_endian (abfd
) ? "big" : "little",
495 TARGET_BYTE_ORDER
== BIG_ENDIAN
? "big" : "little");
500 /* Functions to manipulate the architecture of the target */
502 enum set_arch
{ set_arch_auto
, set_arch_manual
};
504 int target_architecture_auto
= 1;
506 const char *set_architecture_string
;
508 /* Old way of changing the current architecture. */
510 extern const struct bfd_arch_info bfd_default_arch_struct
;
511 const struct bfd_arch_info
*target_architecture
= &bfd_default_arch_struct
;
512 int (*target_architecture_hook
) (const struct bfd_arch_info
*ap
);
515 arch_ok (const struct bfd_arch_info
*arch
)
518 internal_error (__FILE__
, __LINE__
,
519 "arch_ok: not multi-arched");
520 /* Should be performing the more basic check that the binary is
521 compatible with GDB. */
522 /* Check with the target that the architecture is valid. */
523 return (target_architecture_hook
== NULL
524 || target_architecture_hook (arch
));
528 set_arch (const struct bfd_arch_info
*arch
,
532 internal_error (__FILE__
, __LINE__
,
533 "set_arch: not multi-arched");
538 warning ("Target may not support %s architecture",
539 arch
->printable_name
);
540 target_architecture
= arch
;
542 case set_arch_manual
:
545 printf_unfiltered ("Target does not support `%s' architecture.\n",
546 arch
->printable_name
);
550 target_architecture_auto
= 0;
551 target_architecture
= arch
;
556 gdbarch_dump (current_gdbarch
, gdb_stdlog
);
559 /* Set the architecture from arch/machine (deprecated) */
562 set_architecture_from_arch_mach (enum bfd_architecture arch
,
565 const struct bfd_arch_info
*wanted
= bfd_lookup_arch (arch
, mach
);
567 internal_error (__FILE__
, __LINE__
,
568 "set_architecture_from_arch_mach: not multi-arched");
570 set_arch (wanted
, set_arch_manual
);
572 internal_error (__FILE__
, __LINE__
,
573 "gdbarch: hardwired architecture/machine not recognized");
576 /* Set the architecture from a BFD (deprecated) */
579 set_architecture_from_file (bfd
*abfd
)
581 const struct bfd_arch_info
*wanted
= bfd_get_arch_info (abfd
);
583 internal_error (__FILE__
, __LINE__
,
584 "set_architecture_from_file: not multi-arched");
585 if (target_architecture_auto
)
587 set_arch (wanted
, set_arch_auto
);
589 else if (wanted
!= target_architecture
)
591 warning ("%s architecture file may be incompatible with %s target.",
592 wanted
->printable_name
,
593 target_architecture
->printable_name
);
598 /* Called if the user enters ``show architecture'' without an
602 show_architecture (char *args
, int from_tty
)
605 arch
= TARGET_ARCHITECTURE
->printable_name
;
606 if (target_architecture_auto
)
607 printf_filtered ("The target architecture is set automatically (currently %s)\n", arch
);
609 printf_filtered ("The target architecture is assumed to be %s\n", arch
);
613 /* Called if the user enters ``set architecture'' with or without an
617 set_architecture (char *ignore_args
, int from_tty
, struct cmd_list_element
*c
)
619 if (strcmp (set_architecture_string
, "auto") == 0)
621 target_architecture_auto
= 1;
623 else if (GDB_MULTI_ARCH
)
625 struct gdbarch_info info
;
626 memset (&info
, 0, sizeof info
);
627 info
.bfd_arch_info
= bfd_scan_arch (set_architecture_string
);
628 if (info
.bfd_arch_info
== NULL
)
629 internal_error (__FILE__
, __LINE__
,
630 "set_architecture: bfd_scan_arch failed");
631 if (gdbarch_update_p (info
))
632 target_architecture_auto
= 0;
634 printf_unfiltered ("Architecture `%s' not recognized.\n",
635 set_architecture_string
);
639 const struct bfd_arch_info
*arch
640 = bfd_scan_arch (set_architecture_string
);
642 internal_error (__FILE__
, __LINE__
,
643 "set_architecture: bfd_scan_arch failed");
644 set_arch (arch
, set_arch_manual
);
646 show_architecture (NULL
, from_tty
);
649 /* Set the dynamic target-system-dependent parameters (architecture,
650 byte-order) using information found in the BFD */
653 set_gdbarch_from_file (bfd
*abfd
)
657 struct gdbarch_info info
;
658 memset (&info
, 0, sizeof info
);
660 if (! gdbarch_update_p (info
))
661 error ("Architecture of file not recognized.\n");
665 set_architecture_from_file (abfd
);
666 set_endian_from_file (abfd
);
670 /* Initialize the current architecture. Update the ``set
671 architecture'' command so that it specifies a list of valid
674 #ifdef DEFAULT_BFD_ARCH
675 extern const bfd_arch_info_type DEFAULT_BFD_ARCH
;
676 static const bfd_arch_info_type
*default_bfd_arch
= &DEFAULT_BFD_ARCH
;
678 static const bfd_arch_info_type
*default_bfd_arch
;
681 #ifdef DEFAULT_BFD_VEC
682 extern const bfd_target DEFAULT_BFD_VEC
;
683 static const bfd_target
*default_bfd_vec
= &DEFAULT_BFD_VEC
;
685 static const bfd_target
*default_bfd_vec
;
689 initialize_current_architecture (void)
691 const char **arches
= gdbarch_printable_names ();
693 /* determine a default architecture and byte order. */
694 struct gdbarch_info info
;
695 memset (&info
, 0, sizeof (info
));
697 /* Find a default architecture. */
698 if (info
.bfd_arch_info
== NULL
699 && default_bfd_arch
!= NULL
)
700 info
.bfd_arch_info
= default_bfd_arch
;
701 if (info
.bfd_arch_info
== NULL
)
703 /* Choose the architecture by taking the first one
705 const char *chosen
= arches
[0];
707 for (arch
= arches
; *arch
!= NULL
; arch
++)
709 if (strcmp (*arch
, chosen
) < 0)
713 internal_error (__FILE__
, __LINE__
,
714 "initialize_current_architecture: No arch");
715 info
.bfd_arch_info
= bfd_scan_arch (chosen
);
716 if (info
.bfd_arch_info
== NULL
)
717 internal_error (__FILE__
, __LINE__
,
718 "initialize_current_architecture: Arch not found");
721 /* take several guesses at a byte order. */
722 /* NB: can't use TARGET_BYTE_ORDER_DEFAULT as its definition is
724 if (info
.byte_order
== 0
725 && default_bfd_vec
!= NULL
)
727 /* Extract BFD's default vector's byte order. */
728 switch (default_bfd_vec
->byteorder
)
731 info
.byte_order
= BIG_ENDIAN
;
733 case BFD_ENDIAN_LITTLE
:
734 info
.byte_order
= LITTLE_ENDIAN
;
740 if (info
.byte_order
== 0)
742 /* look for ``*el-*'' in the target name. */
744 chp
= strchr (target_name
, '-');
746 && chp
- 2 >= target_name
747 && strncmp (chp
- 2, "el", 2) == 0)
748 info
.byte_order
= LITTLE_ENDIAN
;
750 if (info
.byte_order
== 0)
752 /* Wire it to big-endian!!! */
753 info
.byte_order
= BIG_ENDIAN
;
758 if (! gdbarch_update_p (info
))
760 internal_error (__FILE__
, __LINE__
,
761 "initialize_current_architecture: Selection of initial architecture failed");
765 initialize_non_multiarch ();
767 /* Create the ``set architecture'' command appending ``auto'' to the
768 list of architectures. */
770 struct cmd_list_element
*c
;
771 /* Append ``auto''. */
773 for (nr
= 0; arches
[nr
] != NULL
; nr
++);
774 arches
= xrealloc (arches
, sizeof (char*) * (nr
+ 2));
775 arches
[nr
+ 0] = "auto";
776 arches
[nr
+ 1] = NULL
;
777 /* FIXME: add_set_enum_cmd() uses an array of ``char *'' instead
778 of ``const char *''. We just happen to know that the casts are
780 c
= add_set_enum_cmd ("architecture", class_support
,
781 arches
, &set_architecture_string
,
782 "Set architecture of target.",
784 c
->function
.sfunc
= set_architecture
;
785 add_alias_cmd ("processor", "architecture", class_support
, 1, &setlist
);
786 /* Don't use set_from_show - need to print both auto/manual and
788 add_cmd ("architecture", class_support
, show_architecture
,
789 "Show the current target architecture", &showlist
);
796 extern initialize_file_ftype _initialize_gdbarch_utils
;
799 _initialize_gdbarch_utils (void)
801 struct cmd_list_element
*c
;
802 c
= add_set_enum_cmd ("endian", class_support
,
803 endian_enum
, &set_endian_string
,
804 "Set endianness of target.",
806 c
->function
.sfunc
= set_endian
;
807 /* Don't use set_from_show - need to print both auto/manual and
809 add_cmd ("endian", class_support
, show_endian
,
810 "Show the current byte-order", &showlist
);