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
)
445 return DEPRECATED_REGISTER_CONVERTIBLE (regnum
);
449 legacy_register_to_value (int regnum
, struct type
*type
,
450 char *from
, char *to
)
452 DEPRECATED_REGISTER_CONVERT_TO_VIRTUAL (regnum
, type
, from
, to
);
456 legacy_value_to_register (struct type
*type
, int regnum
,
457 char *from
, char *to
)
459 DEPRECATED_REGISTER_CONVERT_TO_RAW (type
, regnum
, from
, to
);
463 /* Functions to manipulate the endianness of the target. */
465 /* ``target_byte_order'' is only used when non- multi-arch.
466 Multi-arch targets obtain the current byte order using the
467 TARGET_BYTE_ORDER gdbarch method.
469 The choice of initial value is entirely arbitrary. During startup,
470 the function initialize_current_architecture() updates this value
471 based on default byte-order information extracted from BFD. */
472 int target_byte_order
= BFD_ENDIAN_BIG
;
473 int target_byte_order_auto
= 1;
475 static const char endian_big
[] = "big";
476 static const char endian_little
[] = "little";
477 static const char endian_auto
[] = "auto";
478 static const char *endian_enum
[] =
485 static const char *set_endian_string
;
487 /* Called by ``show endian''. */
490 show_endian (char *args
, int from_tty
)
492 if (TARGET_BYTE_ORDER_AUTO
)
493 printf_unfiltered ("The target endianness is set automatically (currently %s endian)\n",
494 (TARGET_BYTE_ORDER
== BFD_ENDIAN_BIG
? "big" : "little"));
496 printf_unfiltered ("The target is assumed to be %s endian\n",
497 (TARGET_BYTE_ORDER
== BFD_ENDIAN_BIG
? "big" : "little"));
501 set_endian (char *ignore_args
, int from_tty
, struct cmd_list_element
*c
)
503 if (set_endian_string
== endian_auto
)
505 target_byte_order_auto
= 1;
507 else if (set_endian_string
== endian_little
)
509 target_byte_order_auto
= 0;
512 struct gdbarch_info info
;
513 gdbarch_info_init (&info
);
514 info
.byte_order
= BFD_ENDIAN_LITTLE
;
515 if (! gdbarch_update_p (info
))
517 printf_unfiltered ("Little endian target not supported by GDB\n");
522 target_byte_order
= BFD_ENDIAN_LITTLE
;
525 else if (set_endian_string
== endian_big
)
527 target_byte_order_auto
= 0;
530 struct gdbarch_info info
;
531 gdbarch_info_init (&info
);
532 info
.byte_order
= BFD_ENDIAN_BIG
;
533 if (! gdbarch_update_p (info
))
535 printf_unfiltered ("Big endian target not supported by GDB\n");
540 target_byte_order
= BFD_ENDIAN_BIG
;
544 internal_error (__FILE__
, __LINE__
,
545 "set_endian: bad value");
546 show_endian (NULL
, from_tty
);
549 /* Set the endianness from a BFD. */
552 set_endian_from_file (bfd
*abfd
)
556 internal_error (__FILE__
, __LINE__
,
557 "set_endian_from_file: not for multi-arch");
558 if (bfd_big_endian (abfd
))
559 want
= BFD_ENDIAN_BIG
;
561 want
= BFD_ENDIAN_LITTLE
;
562 if (TARGET_BYTE_ORDER_AUTO
)
563 target_byte_order
= want
;
564 else if (TARGET_BYTE_ORDER
!= want
)
565 warning ("%s endian file does not match %s endian target.",
566 want
== BFD_ENDIAN_BIG
? "big" : "little",
567 TARGET_BYTE_ORDER
== BFD_ENDIAN_BIG
? "big" : "little");
571 /* Functions to manipulate the architecture of the target */
573 enum set_arch
{ set_arch_auto
, set_arch_manual
};
575 int target_architecture_auto
= 1;
577 const char *set_architecture_string
;
579 /* Old way of changing the current architecture. */
581 extern const struct bfd_arch_info bfd_default_arch_struct
;
582 const struct bfd_arch_info
*target_architecture
= &bfd_default_arch_struct
;
583 int (*target_architecture_hook
) (const struct bfd_arch_info
*ap
);
586 arch_ok (const struct bfd_arch_info
*arch
)
589 internal_error (__FILE__
, __LINE__
,
590 "arch_ok: not multi-arched");
591 /* Should be performing the more basic check that the binary is
592 compatible with GDB. */
593 /* Check with the target that the architecture is valid. */
594 return (target_architecture_hook
== NULL
595 || target_architecture_hook (arch
));
599 set_arch (const struct bfd_arch_info
*arch
,
603 internal_error (__FILE__
, __LINE__
,
604 "set_arch: not multi-arched");
609 warning ("Target may not support %s architecture",
610 arch
->printable_name
);
611 target_architecture
= arch
;
613 case set_arch_manual
:
616 printf_unfiltered ("Target does not support `%s' architecture.\n",
617 arch
->printable_name
);
621 target_architecture_auto
= 0;
622 target_architecture
= arch
;
627 gdbarch_dump (current_gdbarch
, gdb_stdlog
);
630 /* Set the architecture from arch/machine (deprecated) */
633 set_architecture_from_arch_mach (enum bfd_architecture arch
,
636 const struct bfd_arch_info
*wanted
= bfd_lookup_arch (arch
, mach
);
638 internal_error (__FILE__
, __LINE__
,
639 "set_architecture_from_arch_mach: not multi-arched");
641 set_arch (wanted
, set_arch_manual
);
643 internal_error (__FILE__
, __LINE__
,
644 "gdbarch: hardwired architecture/machine not recognized");
647 /* Set the architecture from a BFD (deprecated) */
650 set_architecture_from_file (bfd
*abfd
)
652 const struct bfd_arch_info
*wanted
= bfd_get_arch_info (abfd
);
654 internal_error (__FILE__
, __LINE__
,
655 "set_architecture_from_file: not multi-arched");
656 if (target_architecture_auto
)
658 set_arch (wanted
, set_arch_auto
);
660 else if (wanted
!= target_architecture
)
662 warning ("%s architecture file may be incompatible with %s target.",
663 wanted
->printable_name
,
664 target_architecture
->printable_name
);
669 /* Called if the user enters ``show architecture'' without an
673 show_architecture (char *args
, int from_tty
)
676 arch
= TARGET_ARCHITECTURE
->printable_name
;
677 if (target_architecture_auto
)
678 printf_filtered ("The target architecture is set automatically (currently %s)\n", arch
);
680 printf_filtered ("The target architecture is assumed to be %s\n", arch
);
684 /* Called if the user enters ``set architecture'' with or without an
688 set_architecture (char *ignore_args
, int from_tty
, struct cmd_list_element
*c
)
690 if (strcmp (set_architecture_string
, "auto") == 0)
692 target_architecture_auto
= 1;
694 else if (GDB_MULTI_ARCH
)
696 struct gdbarch_info info
;
697 gdbarch_info_init (&info
);
698 info
.bfd_arch_info
= bfd_scan_arch (set_architecture_string
);
699 if (info
.bfd_arch_info
== NULL
)
700 internal_error (__FILE__
, __LINE__
,
701 "set_architecture: bfd_scan_arch failed");
702 if (gdbarch_update_p (info
))
703 target_architecture_auto
= 0;
705 printf_unfiltered ("Architecture `%s' not recognized.\n",
706 set_architecture_string
);
710 const struct bfd_arch_info
*arch
711 = bfd_scan_arch (set_architecture_string
);
713 internal_error (__FILE__
, __LINE__
,
714 "set_architecture: bfd_scan_arch failed");
715 set_arch (arch
, set_arch_manual
);
717 show_architecture (NULL
, from_tty
);
720 /* Set the dynamic target-system-dependent parameters (architecture,
721 byte-order) using information found in the BFD */
724 set_gdbarch_from_file (bfd
*abfd
)
728 struct gdbarch_info info
;
729 gdbarch_info_init (&info
);
731 if (! gdbarch_update_p (info
))
732 error ("Architecture of file not recognized.\n");
736 set_architecture_from_file (abfd
);
737 set_endian_from_file (abfd
);
741 /* Initialize the current architecture. Update the ``set
742 architecture'' command so that it specifies a list of valid
745 #ifdef DEFAULT_BFD_ARCH
746 extern const bfd_arch_info_type DEFAULT_BFD_ARCH
;
747 static const bfd_arch_info_type
*default_bfd_arch
= &DEFAULT_BFD_ARCH
;
749 static const bfd_arch_info_type
*default_bfd_arch
;
752 #ifdef DEFAULT_BFD_VEC
753 extern const bfd_target DEFAULT_BFD_VEC
;
754 static const bfd_target
*default_bfd_vec
= &DEFAULT_BFD_VEC
;
756 static const bfd_target
*default_bfd_vec
;
760 initialize_current_architecture (void)
762 const char **arches
= gdbarch_printable_names ();
764 /* determine a default architecture and byte order. */
765 struct gdbarch_info info
;
766 gdbarch_info_init (&info
);
768 /* Find a default architecture. */
769 if (info
.bfd_arch_info
== NULL
770 && default_bfd_arch
!= NULL
)
771 info
.bfd_arch_info
= default_bfd_arch
;
772 if (info
.bfd_arch_info
== NULL
)
774 /* Choose the architecture by taking the first one
776 const char *chosen
= arches
[0];
778 for (arch
= arches
; *arch
!= NULL
; arch
++)
780 if (strcmp (*arch
, chosen
) < 0)
784 internal_error (__FILE__
, __LINE__
,
785 "initialize_current_architecture: No arch");
786 info
.bfd_arch_info
= bfd_scan_arch (chosen
);
787 if (info
.bfd_arch_info
== NULL
)
788 internal_error (__FILE__
, __LINE__
,
789 "initialize_current_architecture: Arch not found");
792 /* Take several guesses at a byte order. */
793 if (info
.byte_order
== BFD_ENDIAN_UNKNOWN
794 && default_bfd_vec
!= NULL
)
796 /* Extract BFD's default vector's byte order. */
797 switch (default_bfd_vec
->byteorder
)
800 info
.byte_order
= BFD_ENDIAN_BIG
;
802 case BFD_ENDIAN_LITTLE
:
803 info
.byte_order
= BFD_ENDIAN_LITTLE
;
809 if (info
.byte_order
== BFD_ENDIAN_UNKNOWN
)
811 /* look for ``*el-*'' in the target name. */
813 chp
= strchr (target_name
, '-');
815 && chp
- 2 >= target_name
816 && strncmp (chp
- 2, "el", 2) == 0)
817 info
.byte_order
= BFD_ENDIAN_LITTLE
;
819 if (info
.byte_order
== BFD_ENDIAN_UNKNOWN
)
821 /* Wire it to big-endian!!! */
822 info
.byte_order
= BFD_ENDIAN_BIG
;
827 if (! gdbarch_update_p (info
))
829 internal_error (__FILE__
, __LINE__
,
830 "initialize_current_architecture: Selection of initial architecture failed");
835 /* If the multi-arch logic comes up with a byte-order (from BFD)
836 use it for the non-multi-arch case. */
837 if (info
.byte_order
!= BFD_ENDIAN_UNKNOWN
)
838 target_byte_order
= info
.byte_order
;
839 initialize_non_multiarch ();
842 /* Create the ``set architecture'' command appending ``auto'' to the
843 list of architectures. */
845 struct cmd_list_element
*c
;
846 /* Append ``auto''. */
848 for (nr
= 0; arches
[nr
] != NULL
; nr
++);
849 arches
= xrealloc (arches
, sizeof (char*) * (nr
+ 2));
850 arches
[nr
+ 0] = "auto";
851 arches
[nr
+ 1] = NULL
;
852 /* FIXME: add_set_enum_cmd() uses an array of ``char *'' instead
853 of ``const char *''. We just happen to know that the casts are
855 c
= add_set_enum_cmd ("architecture", class_support
,
856 arches
, &set_architecture_string
,
857 "Set architecture of target.",
859 set_cmd_sfunc (c
, set_architecture
);
860 add_alias_cmd ("processor", "architecture", class_support
, 1, &setlist
);
861 /* Don't use set_from_show - need to print both auto/manual and
863 add_cmd ("architecture", class_support
, show_architecture
,
864 "Show the current target architecture", &showlist
);
869 /* Initialize a gdbarch info to values that will be automatically
870 overridden. Note: Originally, this ``struct info'' was initialized
871 using memset(0). Unfortunatly, that ran into problems, namely
872 BFD_ENDIAN_BIG is zero. An explicit initialization function that
873 can explicitly set each field to a well defined value is used. */
876 gdbarch_info_init (struct gdbarch_info
*info
)
878 memset (info
, 0, sizeof (struct gdbarch_info
));
879 info
->byte_order
= BFD_ENDIAN_UNKNOWN
;
880 info
->osabi
= GDB_OSABI_UNINITIALIZED
;
885 extern initialize_file_ftype _initialize_gdbarch_utils
; /* -Wmissing-prototypes */
888 _initialize_gdbarch_utils (void)
890 struct cmd_list_element
*c
;
891 c
= add_set_enum_cmd ("endian", class_support
,
892 endian_enum
, &set_endian_string
,
893 "Set endianness of target.",
895 set_cmd_sfunc (c
, set_endian
);
896 /* Don't use set_from_show - need to print both auto/manual and
898 add_cmd ("endian", class_support
, show_endian
,
899 "Show the current byte-order", &showlist
);