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"
44 #include "floatformat.h"
46 /* Use the program counter to determine the contents and size
47 of a breakpoint instruction. If no target-dependent macro
48 BREAKPOINT_FROM_PC has been defined to implement this function,
49 assume that the breakpoint doesn't depend on the PC, and
50 use the values of the BIG_BREAKPOINT and LITTLE_BREAKPOINT macros.
51 Return a pointer to a string of bytes that encode a breakpoint
52 instruction, stores the length of the string to *lenptr,
53 and optionally adjust the pc to point to the correct memory location
54 for inserting the breakpoint. */
57 legacy_breakpoint_from_pc (CORE_ADDR
* pcptr
, int *lenptr
)
59 /* {BIG_,LITTLE_}BREAKPOINT is the sequence of bytes we insert for a
60 breakpoint. On some machines, breakpoints are handled by the
61 target environment and we don't have to worry about them here. */
63 if (TARGET_BYTE_ORDER
== BIG_ENDIAN
)
65 static unsigned char big_break_insn
[] = BIG_BREAKPOINT
;
66 *lenptr
= sizeof (big_break_insn
);
67 return big_break_insn
;
70 #ifdef LITTLE_BREAKPOINT
71 if (TARGET_BYTE_ORDER
!= BIG_ENDIAN
)
73 static unsigned char little_break_insn
[] = LITTLE_BREAKPOINT
;
74 *lenptr
= sizeof (little_break_insn
);
75 return little_break_insn
;
80 static unsigned char break_insn
[] = BREAKPOINT
;
81 *lenptr
= sizeof (break_insn
);
90 generic_frameless_function_invocation_not (struct frame_info
*fi
)
96 generic_return_value_on_stack_not (struct type
*type
)
102 legacy_register_name (int i
)
104 #ifdef REGISTER_NAMES
105 static char *names
[] = REGISTER_NAMES
;
106 if (i
< 0 || i
>= (sizeof (names
) / sizeof (*names
)))
111 internal_error (__FILE__
, __LINE__
,
112 "legacy_register_name: called.");
117 #if defined (CALL_DUMMY)
118 LONGEST legacy_call_dummy_words
[] = CALL_DUMMY
;
120 LONGEST legacy_call_dummy_words
[1];
122 int legacy_sizeof_call_dummy_words
= sizeof (legacy_call_dummy_words
);
125 generic_remote_translate_xfer_address (CORE_ADDR gdb_addr
, int gdb_len
,
126 CORE_ADDR
* rem_addr
, int *rem_len
)
128 *rem_addr
= gdb_addr
;
133 generic_prologue_frameless_p (CORE_ADDR ip
)
135 #ifdef SKIP_PROLOGUE_FRAMELESS_P
136 return ip
== SKIP_PROLOGUE_FRAMELESS_P (ip
);
138 return ip
== SKIP_PROLOGUE (ip
);
143 /* Helper functions for INNER_THAN */
146 core_addr_lessthan (CORE_ADDR lhs
, CORE_ADDR rhs
)
152 core_addr_greaterthan (CORE_ADDR lhs
, CORE_ADDR rhs
)
158 /* Helper functions for TARGET_{FLOAT,DOUBLE}_FORMAT */
160 const struct floatformat
*
161 default_float_format (struct gdbarch
*gdbarch
)
164 int byte_order
= gdbarch_byte_order (gdbarch
);
166 int byte_order
= TARGET_BYTE_ORDER
;
171 return &floatformat_ieee_single_big
;
173 return &floatformat_ieee_single_little
;
175 internal_error (__FILE__
, __LINE__
,
176 "default_float_format: bad byte order");
181 const struct floatformat
*
182 default_double_format (struct gdbarch
*gdbarch
)
185 int byte_order
= gdbarch_byte_order (gdbarch
);
187 int byte_order
= TARGET_BYTE_ORDER
;
192 return &floatformat_ieee_double_big
;
194 return &floatformat_ieee_double_little
;
196 internal_error (__FILE__
, __LINE__
,
197 "default_double_format: bad byte order");
201 /* Misc helper functions for targets. */
204 frame_num_args_unknown (struct frame_info
*fi
)
211 generic_register_convertible_not (int num
)
218 default_register_sim_regno (int num
)
225 default_convert_from_func_ptr_addr (CORE_ADDR addr
)
231 no_op_reg_to_regnum (int reg
)
236 /* For use by frame_args_address and frame_locals_address. */
238 default_frame_address (struct frame_info
*fi
)
243 /* Default prepare_to_procced(). */
245 default_prepare_to_proceed (int select_it
)
250 /* Generic prepare_to_proceed(). This one should be suitable for most
251 targets that support threads. */
253 generic_prepare_to_proceed (int select_it
)
256 struct target_waitstatus wait_status
;
258 /* Get the last target status returned by target_wait(). */
259 get_last_target_status (&wait_ptid
, &wait_status
);
261 /* Make sure we were stopped at a breakpoint. */
262 if (wait_status
.kind
!= TARGET_WAITKIND_STOPPED
263 || wait_status
.value
.sig
!= TARGET_SIGNAL_TRAP
)
268 if (!ptid_equal (wait_ptid
, minus_one_ptid
)
269 && !ptid_equal (inferior_ptid
, wait_ptid
))
271 /* Switched over from WAIT_PID. */
272 CORE_ADDR wait_pc
= read_pc_pid (wait_ptid
);
274 /* Avoid switching where it wouldn't do any good, i.e. if both
275 threads are at the same breakpoint. */
276 if (wait_pc
!= read_pc () && breakpoint_here_p (wait_pc
))
280 /* User hasn't deleted the breakpoint. Switch back to
281 WAIT_PID and return non-zero. */
282 inferior_ptid
= wait_ptid
;
284 /* FIXME: This stuff came from switch_to_thread() in
285 thread.c (which should probably be a public function). */
286 flush_cached_frames ();
287 registers_changed ();
289 select_frame (get_current_frame (), 0);
299 /* Functions to manipulate the endianness of the target. */
301 #ifdef TARGET_BYTE_ORDER_SELECTABLE
302 /* compat - Catch old targets that expect a selectable byte-order to
303 default to BIG_ENDIAN */
304 #ifndef TARGET_BYTE_ORDER_DEFAULT
305 #define TARGET_BYTE_ORDER_DEFAULT BIG_ENDIAN
308 #if !TARGET_BYTE_ORDER_SELECTABLE_P
309 #ifndef TARGET_BYTE_ORDER_DEFAULT
310 /* compat - Catch old non byte-order selectable targets that do not
311 define TARGET_BYTE_ORDER_DEFAULT and instead expect
312 TARGET_BYTE_ORDER to be used as the default. For targets that
313 defined neither TARGET_BYTE_ORDER nor TARGET_BYTE_ORDER_DEFAULT the
314 below will get a strange compiler warning. */
315 #define TARGET_BYTE_ORDER_DEFAULT TARGET_BYTE_ORDER
318 #ifndef TARGET_BYTE_ORDER_DEFAULT
319 #define TARGET_BYTE_ORDER_DEFAULT BIG_ENDIAN /* arbitrary */
321 /* ``target_byte_order'' is only used when non- multi-arch.
322 Multi-arch targets obtain the current byte order using
323 TARGET_BYTE_ORDER which is controlled by gdbarch.*. */
324 int target_byte_order
= TARGET_BYTE_ORDER_DEFAULT
;
325 int target_byte_order_auto
= 1;
327 static const char endian_big
[] = "big";
328 static const char endian_little
[] = "little";
329 static const char endian_auto
[] = "auto";
330 static const char *endian_enum
[] =
337 static const char *set_endian_string
;
339 /* Called by ``show endian''. */
342 show_endian (char *args
, int from_tty
)
344 if (TARGET_BYTE_ORDER_AUTO
)
345 printf_unfiltered ("The target endianness is set automatically (currently %s endian)\n",
346 (TARGET_BYTE_ORDER
== BIG_ENDIAN
? "big" : "little"));
348 printf_unfiltered ("The target is assumed to be %s endian\n",
349 (TARGET_BYTE_ORDER
== BIG_ENDIAN
? "big" : "little"));
353 set_endian (char *ignore_args
, int from_tty
, struct cmd_list_element
*c
)
355 if (!TARGET_BYTE_ORDER_SELECTABLE_P
)
357 printf_unfiltered ("Byte order is not selectable.");
359 else if (set_endian_string
== endian_auto
)
361 target_byte_order_auto
= 1;
363 else if (set_endian_string
== endian_little
)
365 target_byte_order_auto
= 0;
368 struct gdbarch_info info
;
369 memset (&info
, 0, sizeof info
);
370 info
.byte_order
= LITTLE_ENDIAN
;
371 if (! gdbarch_update_p (info
))
373 printf_unfiltered ("Little endian target not supported by GDB\n");
378 target_byte_order
= LITTLE_ENDIAN
;
381 else if (set_endian_string
== endian_big
)
383 target_byte_order_auto
= 0;
386 struct gdbarch_info info
;
387 memset (&info
, 0, sizeof info
);
388 info
.byte_order
= BIG_ENDIAN
;
389 if (! gdbarch_update_p (info
))
391 printf_unfiltered ("Big endian target not supported by GDB\n");
396 target_byte_order
= BIG_ENDIAN
;
400 internal_error (__FILE__
, __LINE__
,
401 "set_endian: bad value");
402 show_endian (NULL
, from_tty
);
405 /* Set the endianness from a BFD. */
408 set_endian_from_file (bfd
*abfd
)
411 internal_error (__FILE__
, __LINE__
,
412 "set_endian_from_file: not for multi-arch");
413 if (TARGET_BYTE_ORDER_SELECTABLE_P
)
417 if (bfd_big_endian (abfd
))
420 want
= LITTLE_ENDIAN
;
421 if (TARGET_BYTE_ORDER_AUTO
)
422 target_byte_order
= want
;
423 else if (TARGET_BYTE_ORDER
!= want
)
424 warning ("%s endian file does not match %s endian target.",
425 want
== BIG_ENDIAN
? "big" : "little",
426 TARGET_BYTE_ORDER
== BIG_ENDIAN
? "big" : "little");
430 if (bfd_big_endian (abfd
)
431 ? TARGET_BYTE_ORDER
!= BIG_ENDIAN
432 : TARGET_BYTE_ORDER
== BIG_ENDIAN
)
433 warning ("%s endian file does not match %s endian target.",
434 bfd_big_endian (abfd
) ? "big" : "little",
435 TARGET_BYTE_ORDER
== BIG_ENDIAN
? "big" : "little");
440 /* Functions to manipulate the architecture of the target */
442 enum set_arch
{ set_arch_auto
, set_arch_manual
};
444 int target_architecture_auto
= 1;
446 const char *set_architecture_string
;
448 /* Old way of changing the current architecture. */
450 extern const struct bfd_arch_info bfd_default_arch_struct
;
451 const struct bfd_arch_info
*target_architecture
= &bfd_default_arch_struct
;
452 int (*target_architecture_hook
) (const struct bfd_arch_info
*ap
);
455 arch_ok (const struct bfd_arch_info
*arch
)
458 internal_error (__FILE__
, __LINE__
,
459 "arch_ok: not multi-arched");
460 /* Should be performing the more basic check that the binary is
461 compatible with GDB. */
462 /* Check with the target that the architecture is valid. */
463 return (target_architecture_hook
== NULL
464 || target_architecture_hook (arch
));
468 set_arch (const struct bfd_arch_info
*arch
,
472 internal_error (__FILE__
, __LINE__
,
473 "set_arch: not multi-arched");
478 warning ("Target may not support %s architecture",
479 arch
->printable_name
);
480 target_architecture
= arch
;
482 case set_arch_manual
:
485 printf_unfiltered ("Target does not support `%s' architecture.\n",
486 arch
->printable_name
);
490 target_architecture_auto
= 0;
491 target_architecture
= arch
;
496 gdbarch_dump (current_gdbarch
, gdb_stdlog
);
499 /* Set the architecture from arch/machine (deprecated) */
502 set_architecture_from_arch_mach (enum bfd_architecture arch
,
505 const struct bfd_arch_info
*wanted
= bfd_lookup_arch (arch
, mach
);
507 internal_error (__FILE__
, __LINE__
,
508 "set_architecture_from_arch_mach: not multi-arched");
510 set_arch (wanted
, set_arch_manual
);
512 internal_error (__FILE__
, __LINE__
,
513 "gdbarch: hardwired architecture/machine not recognized");
516 /* Set the architecture from a BFD (deprecated) */
519 set_architecture_from_file (bfd
*abfd
)
521 const struct bfd_arch_info
*wanted
= bfd_get_arch_info (abfd
);
523 internal_error (__FILE__
, __LINE__
,
524 "set_architecture_from_file: not multi-arched");
525 if (target_architecture_auto
)
527 set_arch (wanted
, set_arch_auto
);
529 else if (wanted
!= target_architecture
)
531 warning ("%s architecture file may be incompatible with %s target.",
532 wanted
->printable_name
,
533 target_architecture
->printable_name
);
538 /* Called if the user enters ``show architecture'' without an
542 show_architecture (char *args
, int from_tty
)
545 arch
= TARGET_ARCHITECTURE
->printable_name
;
546 if (target_architecture_auto
)
547 printf_filtered ("The target architecture is set automatically (currently %s)\n", arch
);
549 printf_filtered ("The target architecture is assumed to be %s\n", arch
);
553 /* Called if the user enters ``set architecture'' with or without an
557 set_architecture (char *ignore_args
, int from_tty
, struct cmd_list_element
*c
)
559 if (strcmp (set_architecture_string
, "auto") == 0)
561 target_architecture_auto
= 1;
563 else if (GDB_MULTI_ARCH
)
565 struct gdbarch_info info
;
566 memset (&info
, 0, sizeof info
);
567 info
.bfd_arch_info
= bfd_scan_arch (set_architecture_string
);
568 if (info
.bfd_arch_info
== NULL
)
569 internal_error (__FILE__
, __LINE__
,
570 "set_architecture: bfd_scan_arch failed");
571 if (gdbarch_update_p (info
))
572 target_architecture_auto
= 0;
574 printf_unfiltered ("Architecture `%s' not recognized.\n",
575 set_architecture_string
);
579 const struct bfd_arch_info
*arch
580 = bfd_scan_arch (set_architecture_string
);
582 internal_error (__FILE__
, __LINE__
,
583 "set_architecture: bfd_scan_arch failed");
584 set_arch (arch
, set_arch_manual
);
586 show_architecture (NULL
, from_tty
);
589 /* Set the dynamic target-system-dependent parameters (architecture,
590 byte-order) using information found in the BFD */
593 set_gdbarch_from_file (bfd
*abfd
)
597 struct gdbarch_info info
;
598 memset (&info
, 0, sizeof info
);
600 if (! gdbarch_update_p (info
))
601 error ("Architecture of file not recognized.\n");
605 set_architecture_from_file (abfd
);
606 set_endian_from_file (abfd
);
610 /* Initialize the current architecture. Update the ``set
611 architecture'' command so that it specifies a list of valid
614 #ifdef DEFAULT_BFD_ARCH
615 extern const bfd_arch_info_type DEFAULT_BFD_ARCH
;
616 static const bfd_arch_info_type
*default_bfd_arch
= &DEFAULT_BFD_ARCH
;
618 static const bfd_arch_info_type
*default_bfd_arch
;
621 #ifdef DEFAULT_BFD_VEC
622 extern const bfd_target DEFAULT_BFD_VEC
;
623 static const bfd_target
*default_bfd_vec
= &DEFAULT_BFD_VEC
;
625 static const bfd_target
*default_bfd_vec
;
629 initialize_current_architecture (void)
631 const char **arches
= gdbarch_printable_names ();
633 /* determine a default architecture and byte order. */
634 struct gdbarch_info info
;
635 memset (&info
, 0, sizeof (info
));
637 /* Find a default architecture. */
638 if (info
.bfd_arch_info
== NULL
639 && default_bfd_arch
!= NULL
)
640 info
.bfd_arch_info
= default_bfd_arch
;
641 if (info
.bfd_arch_info
== NULL
)
643 /* Choose the architecture by taking the first one
645 const char *chosen
= arches
[0];
647 for (arch
= arches
; *arch
!= NULL
; arch
++)
649 if (strcmp (*arch
, chosen
) < 0)
653 internal_error (__FILE__
, __LINE__
,
654 "initialize_current_architecture: No arch");
655 info
.bfd_arch_info
= bfd_scan_arch (chosen
);
656 if (info
.bfd_arch_info
== NULL
)
657 internal_error (__FILE__
, __LINE__
,
658 "initialize_current_architecture: Arch not found");
661 /* take several guesses at a byte order. */
662 /* NB: can't use TARGET_BYTE_ORDER_DEFAULT as its definition is
664 if (info
.byte_order
== 0
665 && default_bfd_vec
!= NULL
)
667 /* Extract BFD's default vector's byte order. */
668 switch (default_bfd_vec
->byteorder
)
671 info
.byte_order
= BIG_ENDIAN
;
673 case BFD_ENDIAN_LITTLE
:
674 info
.byte_order
= LITTLE_ENDIAN
;
680 if (info
.byte_order
== 0)
682 /* look for ``*el-*'' in the target name. */
684 chp
= strchr (target_name
, '-');
686 && chp
- 2 >= target_name
687 && strncmp (chp
- 2, "el", 2) == 0)
688 info
.byte_order
= LITTLE_ENDIAN
;
690 if (info
.byte_order
== 0)
692 /* Wire it to big-endian!!! */
693 info
.byte_order
= BIG_ENDIAN
;
698 if (! gdbarch_update_p (info
))
700 internal_error (__FILE__
, __LINE__
,
701 "initialize_current_architecture: Selection of initial architecture failed");
705 /* Create the ``set architecture'' command appending ``auto'' to the
706 list of architectures. */
708 struct cmd_list_element
*c
;
709 /* Append ``auto''. */
711 for (nr
= 0; arches
[nr
] != NULL
; nr
++);
712 arches
= xrealloc (arches
, sizeof (char*) * (nr
+ 2));
713 arches
[nr
+ 0] = "auto";
714 arches
[nr
+ 1] = NULL
;
715 /* FIXME: add_set_enum_cmd() uses an array of ``char *'' instead
716 of ``const char *''. We just happen to know that the casts are
718 c
= add_set_enum_cmd ("architecture", class_support
,
719 arches
, &set_architecture_string
,
720 "Set architecture of target.",
722 c
->function
.sfunc
= set_architecture
;
723 add_alias_cmd ("processor", "architecture", class_support
, 1, &setlist
);
724 /* Don't use set_from_show - need to print both auto/manual and
726 add_cmd ("architecture", class_support
, show_architecture
,
727 "Show the current target architecture", &showlist
);
734 extern initialize_file_ftype _initialize_gdbarch_utils
;
737 _initialize_gdbarch_utils (void)
739 struct cmd_list_element
*c
;
740 c
= add_set_enum_cmd ("endian", class_support
,
741 endian_enum
, &set_endian_string
,
742 "Set endianness of target.",
744 c
->function
.sfunc
= set_endian
;
745 /* Don't use set_from_show - need to print both auto/manual and
747 add_cmd ("endian", class_support
, show_endian
,
748 "Show the current byte-order", &showlist
);