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. */
26 #include "arch-utils.h"
28 #include "inferior.h" /* enum CALL_DUMMY_LOCATION et.al. */
30 /* Just include everything in sight so that the every old definition
31 of macro is visible. */
35 #include "breakpoint.h"
42 #include "gdb_string.h"
44 #include "gdb_assert.h"
45 #include "sim-regno.h"
49 #include "floatformat.h"
51 /* Implementation of extract return value that grubs around in the
54 legacy_extract_return_value (struct type
*type
, struct regcache
*regcache
,
57 char *registers
= deprecated_grub_regcache_for_registers (regcache
);
58 bfd_byte
*buf
= valbuf
;
59 DEPRECATED_EXTRACT_RETURN_VALUE (type
, registers
, buf
); /* OK */
62 /* Implementation of store return value that grubs the register cache.
63 Takes a local copy of the buffer to avoid const problems. */
65 legacy_store_return_value (struct type
*type
, struct regcache
*regcache
,
68 bfd_byte
*b
= alloca (TYPE_LENGTH (type
));
69 gdb_assert (regcache
== current_regcache
);
70 memcpy (b
, buf
, TYPE_LENGTH (type
));
71 DEPRECATED_STORE_RETURN_VALUE (type
, b
);
76 always_use_struct_convention (int gcc_p
, struct type
*value_type
)
83 legacy_register_sim_regno (int regnum
)
85 /* Only makes sense to supply raw registers. */
86 gdb_assert (regnum
>= 0 && regnum
< NUM_REGS
);
87 /* NOTE: cagney/2002-05-13: The old code did it this way and it is
88 suspected that some GDB/SIM combinations may rely on this
89 behavour. The default should be one2one_register_sim_regno
91 if (REGISTER_NAME (regnum
) != NULL
92 && REGISTER_NAME (regnum
)[0] != '\0')
95 return LEGACY_SIM_REGNO_IGNORE
;
99 generic_frameless_function_invocation_not (struct frame_info
*fi
)
105 generic_return_value_on_stack_not (struct type
*type
)
111 generic_skip_trampoline_code (CORE_ADDR pc
)
117 generic_in_solib_call_trampoline (CORE_ADDR pc
, char *name
)
123 generic_in_solib_return_trampoline (CORE_ADDR pc
, char *name
)
129 generic_in_function_epilogue_p (struct gdbarch
*gdbarch
, CORE_ADDR pc
)
135 legacy_register_name (int i
)
137 #ifdef REGISTER_NAMES
138 static char *names
[] = REGISTER_NAMES
;
139 if (i
< 0 || i
>= (sizeof (names
) / sizeof (*names
)))
144 internal_error (__FILE__
, __LINE__
,
145 "legacy_register_name: called.");
150 #if defined (CALL_DUMMY)
151 LONGEST legacy_call_dummy_words
[] = CALL_DUMMY
;
153 LONGEST legacy_call_dummy_words
[1];
155 int legacy_sizeof_call_dummy_words
= sizeof (legacy_call_dummy_words
);
158 generic_remote_translate_xfer_address (struct gdbarch
*gdbarch
,
159 struct regcache
*regcache
,
160 CORE_ADDR gdb_addr
, int gdb_len
,
161 CORE_ADDR
* rem_addr
, int *rem_len
)
163 *rem_addr
= gdb_addr
;
168 generic_prologue_frameless_p (CORE_ADDR ip
)
170 return ip
== SKIP_PROLOGUE (ip
);
173 /* New/multi-arched targets should use the correct gdbarch field
174 instead of using this global pointer. */
176 legacy_print_insn (bfd_vma vma
, disassemble_info
*info
)
178 return (*deprecated_tm_print_insn
) (vma
, info
);
181 /* Helper functions for INNER_THAN */
184 core_addr_lessthan (CORE_ADDR lhs
, CORE_ADDR rhs
)
190 core_addr_greaterthan (CORE_ADDR lhs
, CORE_ADDR rhs
)
196 /* Helper functions for TARGET_{FLOAT,DOUBLE}_FORMAT */
198 const struct floatformat
*
199 default_float_format (struct gdbarch
*gdbarch
)
202 int byte_order
= gdbarch_byte_order (gdbarch
);
204 int byte_order
= TARGET_BYTE_ORDER
;
209 return &floatformat_ieee_single_big
;
210 case BFD_ENDIAN_LITTLE
:
211 return &floatformat_ieee_single_little
;
213 internal_error (__FILE__
, __LINE__
,
214 "default_float_format: bad byte order");
219 const struct floatformat
*
220 default_double_format (struct gdbarch
*gdbarch
)
223 int byte_order
= gdbarch_byte_order (gdbarch
);
225 int byte_order
= TARGET_BYTE_ORDER
;
230 return &floatformat_ieee_double_big
;
231 case BFD_ENDIAN_LITTLE
:
232 return &floatformat_ieee_double_little
;
234 internal_error (__FILE__
, __LINE__
,
235 "default_double_format: bad byte order");
239 /* Misc helper functions for targets. */
242 deprecated_register_convertible_not (int num
)
248 /* Under some ABI's that specify the `struct convention' for returning
249 structures by value, by the time we've returned from the function,
250 the return value is sitting there in the caller's buffer, but GDB
251 has no way to find the address of that buffer.
253 On such architectures, use this function as your
254 extract_struct_value_address method. When asked to a struct
255 returned by value in this fashion, GDB will print a nice error
256 message, instead of garbage. */
258 generic_cannot_extract_struct_value_address (char *dummy
)
264 core_addr_identity (CORE_ADDR addr
)
270 no_op_reg_to_regnum (int reg
)
275 /* Default prepare_to_procced(). */
277 default_prepare_to_proceed (int select_it
)
282 /* Generic prepare_to_proceed(). This one should be suitable for most
283 targets that support threads. */
285 generic_prepare_to_proceed (int select_it
)
288 struct target_waitstatus wait_status
;
290 /* Get the last target status returned by target_wait(). */
291 get_last_target_status (&wait_ptid
, &wait_status
);
293 /* Make sure we were stopped either at a breakpoint, or because
295 if (wait_status
.kind
!= TARGET_WAITKIND_STOPPED
296 || (wait_status
.value
.sig
!= TARGET_SIGNAL_TRAP
&&
297 wait_status
.value
.sig
!= TARGET_SIGNAL_INT
))
302 if (!ptid_equal (wait_ptid
, minus_one_ptid
)
303 && !ptid_equal (inferior_ptid
, wait_ptid
))
305 /* Switched over from WAIT_PID. */
306 CORE_ADDR wait_pc
= read_pc_pid (wait_ptid
);
308 if (wait_pc
!= read_pc ())
312 /* Switch back to WAIT_PID thread. */
313 inferior_ptid
= wait_ptid
;
315 /* FIXME: This stuff came from switch_to_thread() in
316 thread.c (which should probably be a public function). */
317 flush_cached_frames ();
318 registers_changed ();
320 select_frame (get_current_frame ());
322 /* We return 1 to indicate that there is a breakpoint here,
323 so we need to step over it before continuing to avoid
324 hitting it straight away. */
325 if (breakpoint_here_p (wait_pc
))
336 init_frame_pc_noop (int fromleaf
, struct frame_info
*prev
)
338 /* Do nothing, implies return the same PC value. */
339 return get_frame_pc (prev
);
343 init_frame_pc_default (int fromleaf
, struct frame_info
*prev
)
345 if (fromleaf
&& DEPRECATED_SAVED_PC_AFTER_CALL_P ())
346 return DEPRECATED_SAVED_PC_AFTER_CALL (get_next_frame (prev
));
347 else if (get_next_frame (prev
) != NULL
)
348 return DEPRECATED_FRAME_SAVED_PC (get_next_frame (prev
));
354 default_elf_make_msymbol_special (asymbol
*sym
, struct minimal_symbol
*msym
)
360 default_coff_make_msymbol_special (int val
, struct minimal_symbol
*msym
)
366 cannot_register_not (int regnum
)
371 /* Legacy version of target_virtual_frame_pointer(). Assumes that
372 there is an DEPRECATED_FP_REGNUM and that it is the same, cooked or
376 legacy_virtual_frame_pointer (CORE_ADDR pc
,
378 LONGEST
*frame_offset
)
380 /* FIXME: cagney/2002-09-13: This code is used when identifying the
381 frame pointer of the current PC. It is assuming that a single
382 register and an offset can determine this. I think it should
383 instead generate a byte code expression as that would work better
384 with things like Dwarf2's CFI. */
385 if (DEPRECATED_FP_REGNUM
>= 0 && DEPRECATED_FP_REGNUM
< NUM_REGS
)
386 *frame_regnum
= DEPRECATED_FP_REGNUM
;
387 else if (SP_REGNUM
>= 0 && SP_REGNUM
< NUM_REGS
)
388 *frame_regnum
= SP_REGNUM
;
390 /* Should this be an internal error? I guess so, it is reflecting
391 an architectural limitation in the current design. */
392 internal_error (__FILE__
, __LINE__
, "No virtual frame pointer available");
396 /* Assume the world is sane, every register's virtual and real size
400 generic_register_size (int regnum
)
402 gdb_assert (regnum
>= 0 && regnum
< NUM_REGS
+ NUM_PSEUDO_REGS
);
403 if (gdbarch_register_type_p (current_gdbarch
))
404 return TYPE_LENGTH (gdbarch_register_type (current_gdbarch
, regnum
));
406 /* FIXME: cagney/2003-03-01: Once all architectures implement
407 gdbarch_register_type(), this entire function can go away. It
408 is made obsolete by register_size(). */
409 return TYPE_LENGTH (REGISTER_VIRTUAL_TYPE (regnum
)); /* OK */
412 /* Assume all registers are adjacent. */
415 generic_register_byte (int regnum
)
419 gdb_assert (regnum
>= 0 && regnum
< NUM_REGS
+ NUM_PSEUDO_REGS
);
421 for (i
= 0; i
< regnum
; i
++)
423 byte
+= generic_register_size (i
);
430 legacy_pc_in_sigtramp (CORE_ADDR pc
, char *name
)
432 #if !defined (IN_SIGTRAMP)
433 if (SIGTRAMP_START_P ())
434 return (pc
) >= SIGTRAMP_START (pc
) && (pc
) < SIGTRAMP_END (pc
);
436 return name
&& strcmp ("_sigtramp", name
) == 0;
438 return IN_SIGTRAMP (pc
, name
);
443 legacy_convert_register_p (int regnum
, struct type
*type
)
445 return DEPRECATED_REGISTER_CONVERTIBLE (regnum
);
449 legacy_register_to_value (struct frame_info
*frame
, int regnum
,
450 struct type
*type
, void *to
)
452 char from
[MAX_REGISTER_SIZE
];
453 frame_read_register (frame
, regnum
, from
);
454 DEPRECATED_REGISTER_CONVERT_TO_VIRTUAL (regnum
, type
, from
, to
);
458 legacy_value_to_register (struct frame_info
*frame
, int regnum
,
459 struct type
*type
, const void *tmp
)
461 char to
[MAX_REGISTER_SIZE
];
462 char *from
= alloca (TYPE_LENGTH (type
));
463 memcpy (from
, from
, TYPE_LENGTH (type
));
464 DEPRECATED_REGISTER_CONVERT_TO_RAW (type
, regnum
, from
, to
);
465 put_frame_register (frame
, regnum
, to
);
469 /* Functions to manipulate the endianness of the target. */
471 /* ``target_byte_order'' is only used when non- multi-arch.
472 Multi-arch targets obtain the current byte order using the
473 TARGET_BYTE_ORDER gdbarch method.
475 The choice of initial value is entirely arbitrary. During startup,
476 the function initialize_current_architecture() updates this value
477 based on default byte-order information extracted from BFD. */
478 int target_byte_order
= BFD_ENDIAN_BIG
;
479 int target_byte_order_auto
= 1;
481 static const char endian_big
[] = "big";
482 static const char endian_little
[] = "little";
483 static const char endian_auto
[] = "auto";
484 static const char *endian_enum
[] =
491 static const char *set_endian_string
;
493 /* Called by ``show endian''. */
496 show_endian (char *args
, int from_tty
)
498 if (TARGET_BYTE_ORDER_AUTO
)
499 printf_unfiltered ("The target endianness is set automatically (currently %s endian)\n",
500 (TARGET_BYTE_ORDER
== BFD_ENDIAN_BIG
? "big" : "little"));
502 printf_unfiltered ("The target is assumed to be %s endian\n",
503 (TARGET_BYTE_ORDER
== BFD_ENDIAN_BIG
? "big" : "little"));
507 set_endian (char *ignore_args
, int from_tty
, struct cmd_list_element
*c
)
509 if (set_endian_string
== endian_auto
)
511 target_byte_order_auto
= 1;
513 else if (set_endian_string
== endian_little
)
515 target_byte_order_auto
= 0;
518 struct gdbarch_info info
;
519 gdbarch_info_init (&info
);
520 info
.byte_order
= BFD_ENDIAN_LITTLE
;
521 if (! gdbarch_update_p (info
))
523 printf_unfiltered ("Little endian target not supported by GDB\n");
528 target_byte_order
= BFD_ENDIAN_LITTLE
;
531 else if (set_endian_string
== endian_big
)
533 target_byte_order_auto
= 0;
536 struct gdbarch_info info
;
537 gdbarch_info_init (&info
);
538 info
.byte_order
= BFD_ENDIAN_BIG
;
539 if (! gdbarch_update_p (info
))
541 printf_unfiltered ("Big endian target not supported by GDB\n");
546 target_byte_order
= BFD_ENDIAN_BIG
;
550 internal_error (__FILE__
, __LINE__
,
551 "set_endian: bad value");
552 show_endian (NULL
, from_tty
);
555 /* Set the endianness from a BFD. */
558 set_endian_from_file (bfd
*abfd
)
562 internal_error (__FILE__
, __LINE__
,
563 "set_endian_from_file: not for multi-arch");
564 if (bfd_big_endian (abfd
))
565 want
= BFD_ENDIAN_BIG
;
567 want
= BFD_ENDIAN_LITTLE
;
568 if (TARGET_BYTE_ORDER_AUTO
)
569 target_byte_order
= want
;
570 else if (TARGET_BYTE_ORDER
!= want
)
571 warning ("%s endian file does not match %s endian target.",
572 want
== BFD_ENDIAN_BIG
? "big" : "little",
573 TARGET_BYTE_ORDER
== BFD_ENDIAN_BIG
? "big" : "little");
577 /* Functions to manipulate the architecture of the target */
579 enum set_arch
{ set_arch_auto
, set_arch_manual
};
581 int target_architecture_auto
= 1;
583 const char *set_architecture_string
;
585 /* Old way of changing the current architecture. */
587 extern const struct bfd_arch_info bfd_default_arch_struct
;
588 const struct bfd_arch_info
*target_architecture
= &bfd_default_arch_struct
;
589 int (*target_architecture_hook
) (const struct bfd_arch_info
*ap
);
592 arch_ok (const struct bfd_arch_info
*arch
)
595 internal_error (__FILE__
, __LINE__
,
596 "arch_ok: not multi-arched");
597 /* Should be performing the more basic check that the binary is
598 compatible with GDB. */
599 /* Check with the target that the architecture is valid. */
600 return (target_architecture_hook
== NULL
601 || target_architecture_hook (arch
));
605 set_arch (const struct bfd_arch_info
*arch
,
609 internal_error (__FILE__
, __LINE__
,
610 "set_arch: not multi-arched");
615 warning ("Target may not support %s architecture",
616 arch
->printable_name
);
617 target_architecture
= arch
;
619 case set_arch_manual
:
622 printf_unfiltered ("Target does not support `%s' architecture.\n",
623 arch
->printable_name
);
627 target_architecture_auto
= 0;
628 target_architecture
= arch
;
633 gdbarch_dump (current_gdbarch
, gdb_stdlog
);
636 /* Set the architecture from arch/machine (deprecated) */
639 set_architecture_from_arch_mach (enum bfd_architecture arch
,
642 const struct bfd_arch_info
*wanted
= bfd_lookup_arch (arch
, mach
);
644 internal_error (__FILE__
, __LINE__
,
645 "set_architecture_from_arch_mach: not multi-arched");
647 set_arch (wanted
, set_arch_manual
);
649 internal_error (__FILE__
, __LINE__
,
650 "gdbarch: hardwired architecture/machine not recognized");
653 /* Set the architecture from a BFD (deprecated) */
656 set_architecture_from_file (bfd
*abfd
)
658 const struct bfd_arch_info
*wanted
= bfd_get_arch_info (abfd
);
660 internal_error (__FILE__
, __LINE__
,
661 "set_architecture_from_file: not multi-arched");
662 if (target_architecture_auto
)
664 set_arch (wanted
, set_arch_auto
);
666 else if (wanted
!= target_architecture
)
668 warning ("%s architecture file may be incompatible with %s target.",
669 wanted
->printable_name
,
670 target_architecture
->printable_name
);
675 /* Called if the user enters ``show architecture'' without an
679 show_architecture (char *args
, int from_tty
)
682 arch
= TARGET_ARCHITECTURE
->printable_name
;
683 if (target_architecture_auto
)
684 printf_filtered ("The target architecture is set automatically (currently %s)\n", arch
);
686 printf_filtered ("The target architecture is assumed to be %s\n", arch
);
690 /* Called if the user enters ``set architecture'' with or without an
694 set_architecture (char *ignore_args
, int from_tty
, struct cmd_list_element
*c
)
696 if (strcmp (set_architecture_string
, "auto") == 0)
698 target_architecture_auto
= 1;
700 else if (GDB_MULTI_ARCH
)
702 struct gdbarch_info info
;
703 gdbarch_info_init (&info
);
704 info
.bfd_arch_info
= bfd_scan_arch (set_architecture_string
);
705 if (info
.bfd_arch_info
== NULL
)
706 internal_error (__FILE__
, __LINE__
,
707 "set_architecture: bfd_scan_arch failed");
708 if (gdbarch_update_p (info
))
709 target_architecture_auto
= 0;
711 printf_unfiltered ("Architecture `%s' not recognized.\n",
712 set_architecture_string
);
716 const struct bfd_arch_info
*arch
717 = bfd_scan_arch (set_architecture_string
);
719 internal_error (__FILE__
, __LINE__
,
720 "set_architecture: bfd_scan_arch failed");
721 set_arch (arch
, set_arch_manual
);
723 show_architecture (NULL
, from_tty
);
726 /* Set the dynamic target-system-dependent parameters (architecture,
727 byte-order) using information found in the BFD */
730 set_gdbarch_from_file (bfd
*abfd
)
734 struct gdbarch_info info
;
735 gdbarch_info_init (&info
);
737 if (! gdbarch_update_p (info
))
738 error ("Architecture of file not recognized.\n");
742 set_architecture_from_file (abfd
);
743 set_endian_from_file (abfd
);
747 /* Initialize the current architecture. Update the ``set
748 architecture'' command so that it specifies a list of valid
751 #ifdef DEFAULT_BFD_ARCH
752 extern const bfd_arch_info_type DEFAULT_BFD_ARCH
;
753 static const bfd_arch_info_type
*default_bfd_arch
= &DEFAULT_BFD_ARCH
;
755 static const bfd_arch_info_type
*default_bfd_arch
;
758 #ifdef DEFAULT_BFD_VEC
759 extern const bfd_target DEFAULT_BFD_VEC
;
760 static const bfd_target
*default_bfd_vec
= &DEFAULT_BFD_VEC
;
762 static const bfd_target
*default_bfd_vec
;
766 initialize_current_architecture (void)
768 const char **arches
= gdbarch_printable_names ();
770 /* determine a default architecture and byte order. */
771 struct gdbarch_info info
;
772 gdbarch_info_init (&info
);
774 /* Find a default architecture. */
775 if (info
.bfd_arch_info
== NULL
776 && default_bfd_arch
!= NULL
)
777 info
.bfd_arch_info
= default_bfd_arch
;
778 if (info
.bfd_arch_info
== NULL
)
780 /* Choose the architecture by taking the first one
782 const char *chosen
= arches
[0];
784 for (arch
= arches
; *arch
!= NULL
; arch
++)
786 if (strcmp (*arch
, chosen
) < 0)
790 internal_error (__FILE__
, __LINE__
,
791 "initialize_current_architecture: No arch");
792 info
.bfd_arch_info
= bfd_scan_arch (chosen
);
793 if (info
.bfd_arch_info
== NULL
)
794 internal_error (__FILE__
, __LINE__
,
795 "initialize_current_architecture: Arch not found");
798 /* Take several guesses at a byte order. */
799 if (info
.byte_order
== BFD_ENDIAN_UNKNOWN
800 && default_bfd_vec
!= NULL
)
802 /* Extract BFD's default vector's byte order. */
803 switch (default_bfd_vec
->byteorder
)
806 info
.byte_order
= BFD_ENDIAN_BIG
;
808 case BFD_ENDIAN_LITTLE
:
809 info
.byte_order
= BFD_ENDIAN_LITTLE
;
815 if (info
.byte_order
== BFD_ENDIAN_UNKNOWN
)
817 /* look for ``*el-*'' in the target name. */
819 chp
= strchr (target_name
, '-');
821 && chp
- 2 >= target_name
822 && strncmp (chp
- 2, "el", 2) == 0)
823 info
.byte_order
= BFD_ENDIAN_LITTLE
;
825 if (info
.byte_order
== BFD_ENDIAN_UNKNOWN
)
827 /* Wire it to big-endian!!! */
828 info
.byte_order
= BFD_ENDIAN_BIG
;
833 if (! gdbarch_update_p (info
))
835 internal_error (__FILE__
, __LINE__
,
836 "initialize_current_architecture: Selection of initial architecture failed");
841 /* If the multi-arch logic comes up with a byte-order (from BFD)
842 use it for the non-multi-arch case. */
843 if (info
.byte_order
!= BFD_ENDIAN_UNKNOWN
)
844 target_byte_order
= info
.byte_order
;
845 initialize_non_multiarch ();
848 /* Create the ``set architecture'' command appending ``auto'' to the
849 list of architectures. */
851 struct cmd_list_element
*c
;
852 /* Append ``auto''. */
854 for (nr
= 0; arches
[nr
] != NULL
; nr
++);
855 arches
= xrealloc (arches
, sizeof (char*) * (nr
+ 2));
856 arches
[nr
+ 0] = "auto";
857 arches
[nr
+ 1] = NULL
;
858 /* FIXME: add_set_enum_cmd() uses an array of ``char *'' instead
859 of ``const char *''. We just happen to know that the casts are
861 c
= add_set_enum_cmd ("architecture", class_support
,
862 arches
, &set_architecture_string
,
863 "Set architecture of target.",
865 set_cmd_sfunc (c
, set_architecture
);
866 add_alias_cmd ("processor", "architecture", class_support
, 1, &setlist
);
867 /* Don't use set_from_show - need to print both auto/manual and
869 add_cmd ("architecture", class_support
, show_architecture
,
870 "Show the current target architecture", &showlist
);
875 /* Initialize a gdbarch info to values that will be automatically
876 overridden. Note: Originally, this ``struct info'' was initialized
877 using memset(0). Unfortunatly, that ran into problems, namely
878 BFD_ENDIAN_BIG is zero. An explicit initialization function that
879 can explicitly set each field to a well defined value is used. */
882 gdbarch_info_init (struct gdbarch_info
*info
)
884 memset (info
, 0, sizeof (struct gdbarch_info
));
885 info
->byte_order
= BFD_ENDIAN_UNKNOWN
;
886 info
->osabi
= GDB_OSABI_UNINITIALIZED
;
891 extern initialize_file_ftype _initialize_gdbarch_utils
; /* -Wmissing-prototypes */
894 _initialize_gdbarch_utils (void)
896 struct cmd_list_element
*c
;
897 c
= add_set_enum_cmd ("endian", class_support
,
898 endian_enum
, &set_endian_string
,
899 "Set endianness of target.",
901 set_cmd_sfunc (c
, set_endian
);
902 /* Don't use set_from_show - need to print both auto/manual and
904 add_cmd ("endian", class_support
, show_endian
,
905 "Show the current byte-order", &showlist
);