1 /* Dynamic architecture support for GDB, the GNU debugger.
3 Copyright 1998, 1999, 2000, 2001, 2002 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. */
32 #include "gdb_string.h"
36 #include "breakpoint.h"
44 #include "gdb_assert.h"
45 #include "sim-regno.h"
49 #include "floatformat.h"
51 /* Use the program counter to determine the contents and size
52 of a breakpoint instruction. If no target-dependent macro
53 BREAKPOINT_FROM_PC has been defined to implement this function,
54 assume that the breakpoint doesn't depend on the PC, and
55 use the values of the BIG_BREAKPOINT and LITTLE_BREAKPOINT macros.
56 Return a pointer to a string of bytes that encode a breakpoint
57 instruction, stores the length of the string to *lenptr,
58 and optionally adjust the pc to point to the correct memory location
59 for inserting the breakpoint. */
62 legacy_breakpoint_from_pc (CORE_ADDR
* pcptr
, int *lenptr
)
64 /* {BIG_,LITTLE_}BREAKPOINT is the sequence of bytes we insert for a
65 breakpoint. On some machines, breakpoints are handled by the
66 target environment and we don't have to worry about them here. */
68 if (TARGET_BYTE_ORDER
== BFD_ENDIAN_BIG
)
70 static unsigned char big_break_insn
[] = BIG_BREAKPOINT
;
71 *lenptr
= sizeof (big_break_insn
);
72 return big_break_insn
;
75 #ifdef LITTLE_BREAKPOINT
76 if (TARGET_BYTE_ORDER
!= BFD_ENDIAN_BIG
)
78 static unsigned char little_break_insn
[] = LITTLE_BREAKPOINT
;
79 *lenptr
= sizeof (little_break_insn
);
80 return little_break_insn
;
85 static unsigned char break_insn
[] = BREAKPOINT
;
86 *lenptr
= sizeof (break_insn
);
95 legacy_register_sim_regno (int regnum
)
97 /* Only makes sense to supply raw registers. */
98 gdb_assert (regnum
>= 0 && regnum
< NUM_REGS
);
99 /* NOTE: cagney/2002-05-13: The old code did it this way and it is
100 suspected that some GDB/SIM combinations may rely on this
101 behavour. The default should be one2one_register_sim_regno
103 if (REGISTER_NAME (regnum
) != NULL
104 && REGISTER_NAME (regnum
)[0] != '\0')
107 return LEGACY_SIM_REGNO_IGNORE
;
111 generic_frameless_function_invocation_not (struct frame_info
*fi
)
117 generic_return_value_on_stack_not (struct type
*type
)
123 generic_skip_trampoline_code (CORE_ADDR pc
)
129 generic_in_solib_call_trampoline (CORE_ADDR pc
, char *name
)
135 generic_in_function_epilogue_p (struct gdbarch
*gdbarch
, CORE_ADDR pc
)
141 legacy_register_name (int i
)
143 #ifdef REGISTER_NAMES
144 static char *names
[] = REGISTER_NAMES
;
145 if (i
< 0 || i
>= (sizeof (names
) / sizeof (*names
)))
150 internal_error (__FILE__
, __LINE__
,
151 "legacy_register_name: called.");
156 #if defined (CALL_DUMMY)
157 LONGEST legacy_call_dummy_words
[] = CALL_DUMMY
;
159 LONGEST legacy_call_dummy_words
[1];
161 int legacy_sizeof_call_dummy_words
= sizeof (legacy_call_dummy_words
);
164 generic_remote_translate_xfer_address (CORE_ADDR gdb_addr
, int gdb_len
,
165 CORE_ADDR
* rem_addr
, int *rem_len
)
167 *rem_addr
= gdb_addr
;
172 generic_prologue_frameless_p (CORE_ADDR ip
)
174 return ip
== SKIP_PROLOGUE (ip
);
177 /* New/multi-arched targets should use the correct gdbarch field
178 instead of using this global pointer. */
180 legacy_print_insn (bfd_vma vma
, disassemble_info
*info
)
182 return (*tm_print_insn
) (vma
, info
);
185 /* Helper functions for INNER_THAN */
188 core_addr_lessthan (CORE_ADDR lhs
, CORE_ADDR rhs
)
194 core_addr_greaterthan (CORE_ADDR lhs
, CORE_ADDR rhs
)
200 /* Helper functions for TARGET_{FLOAT,DOUBLE}_FORMAT */
202 const struct floatformat
*
203 default_float_format (struct gdbarch
*gdbarch
)
206 int byte_order
= gdbarch_byte_order (gdbarch
);
208 int byte_order
= TARGET_BYTE_ORDER
;
213 return &floatformat_ieee_single_big
;
214 case BFD_ENDIAN_LITTLE
:
215 return &floatformat_ieee_single_little
;
217 internal_error (__FILE__
, __LINE__
,
218 "default_float_format: bad byte order");
223 const struct floatformat
*
224 default_double_format (struct gdbarch
*gdbarch
)
227 int byte_order
= gdbarch_byte_order (gdbarch
);
229 int byte_order
= TARGET_BYTE_ORDER
;
234 return &floatformat_ieee_double_big
;
235 case BFD_ENDIAN_LITTLE
:
236 return &floatformat_ieee_double_little
;
238 internal_error (__FILE__
, __LINE__
,
239 "default_double_format: bad byte order");
244 default_print_float_info (struct gdbarch
*gdbarch
, struct ui_file
*file
,
245 struct frame_info
*frame
)
248 #if GDB_MULTI_ARCH > GDB_MULTI_ARCH_PARTIAL
249 #error "FLOAT_INFO defined in multi-arch"
253 fprintf_filtered (file
, "\
254 No floating point info available for this processor.\n");
258 /* Misc helper functions for targets. */
261 frame_num_args_unknown (struct frame_info
*fi
)
268 generic_register_convertible_not (int num
)
274 /* Under some ABI's that specify the `struct convention' for returning
275 structures by value, by the time we've returned from the function,
276 the return value is sitting there in the caller's buffer, but GDB
277 has no way to find the address of that buffer.
279 On such architectures, use this function as your
280 extract_struct_value_address method. When asked to a struct
281 returned by value in this fashion, GDB will print a nice error
282 message, instead of garbage. */
284 generic_cannot_extract_struct_value_address (char *dummy
)
290 core_addr_identity (CORE_ADDR addr
)
296 no_op_reg_to_regnum (int reg
)
301 /* For use by frame_args_address and frame_locals_address. */
303 default_frame_address (struct frame_info
*fi
)
308 /* Default prepare_to_procced(). */
310 default_prepare_to_proceed (int select_it
)
315 /* Generic prepare_to_proceed(). This one should be suitable for most
316 targets that support threads. */
318 generic_prepare_to_proceed (int select_it
)
321 struct target_waitstatus wait_status
;
323 /* Get the last target status returned by target_wait(). */
324 get_last_target_status (&wait_ptid
, &wait_status
);
326 /* Make sure we were stopped either at a breakpoint, or because
328 if (wait_status
.kind
!= TARGET_WAITKIND_STOPPED
329 || (wait_status
.value
.sig
!= TARGET_SIGNAL_TRAP
&&
330 wait_status
.value
.sig
!= TARGET_SIGNAL_INT
))
335 if (!ptid_equal (wait_ptid
, minus_one_ptid
)
336 && !ptid_equal (inferior_ptid
, wait_ptid
))
338 /* Switched over from WAIT_PID. */
339 CORE_ADDR wait_pc
= read_pc_pid (wait_ptid
);
341 if (wait_pc
!= read_pc ())
345 /* Switch back to WAIT_PID thread. */
346 inferior_ptid
= wait_ptid
;
348 /* FIXME: This stuff came from switch_to_thread() in
349 thread.c (which should probably be a public function). */
350 flush_cached_frames ();
351 registers_changed ();
353 select_frame (get_current_frame ());
355 /* We return 1 to indicate that there is a breakpoint here,
356 so we need to step over it before continuing to avoid
357 hitting it straight away. */
358 if (breakpoint_here_p (wait_pc
))
369 init_frame_pc_noop (int fromleaf
, struct frame_info
*prev
)
375 init_frame_pc_default (int fromleaf
, struct frame_info
*prev
)
378 prev
->pc
= SAVED_PC_AFTER_CALL (prev
->next
);
379 else if (prev
->next
!= NULL
)
380 prev
->pc
= FRAME_SAVED_PC (prev
->next
);
382 prev
->pc
= read_pc ();
386 default_elf_make_msymbol_special (asymbol
*sym
, struct minimal_symbol
*msym
)
392 default_coff_make_msymbol_special (int val
, struct minimal_symbol
*msym
)
398 cannot_register_not (int regnum
)
403 /* Legacy version of target_virtual_frame_pointer(). Assumes that
404 there is an FP_REGNUM and that it is the same, cooked or raw. */
407 legacy_virtual_frame_pointer (CORE_ADDR pc
,
409 LONGEST
*frame_offset
)
411 gdb_assert (FP_REGNUM
>= 0);
412 *frame_regnum
= FP_REGNUM
;
416 /* Assume the world is sane, every register's virtual and real size
420 generic_register_size (int regnum
)
422 gdb_assert (regnum
>= 0 && regnum
< NUM_REGS
+ NUM_PSEUDO_REGS
);
423 return TYPE_LENGTH (REGISTER_VIRTUAL_TYPE (regnum
));
426 #if !defined (IN_SIGTRAMP)
427 #if defined (SIGTRAMP_START)
428 #define IN_SIGTRAMP(pc, name) \
429 ((pc) >= SIGTRAMP_START(pc) \
430 && (pc) < SIGTRAMP_END(pc) \
433 #define IN_SIGTRAMP(pc, name) \
434 (name && STREQ ("_sigtramp", name))
439 legacy_pc_in_sigtramp (CORE_ADDR pc
, char *name
)
441 return IN_SIGTRAMP(pc
, name
);
445 legacy_convert_register_p (int regnum
)
447 return REGISTER_CONVERTIBLE (regnum
);
451 legacy_register_to_value (int regnum
, struct type
*type
,
452 char *from
, char *to
)
454 REGISTER_CONVERT_TO_VIRTUAL (regnum
, type
, from
, to
);
458 legacy_value_to_register (struct type
*type
, int regnum
,
459 char *from
, char *to
)
461 REGISTER_CONVERT_TO_RAW (type
, regnum
, from
, to
);
465 /* Functions to manipulate the endianness of the target. */
467 /* ``target_byte_order'' is only used when non- multi-arch.
468 Multi-arch targets obtain the current byte order using the
469 TARGET_BYTE_ORDER gdbarch method.
471 The choice of initial value is entirely arbitrary. During startup,
472 the function initialize_current_architecture() updates this value
473 based on default byte-order information extracted from BFD. */
474 int target_byte_order
= BFD_ENDIAN_BIG
;
475 int target_byte_order_auto
= 1;
477 static const char endian_big
[] = "big";
478 static const char endian_little
[] = "little";
479 static const char endian_auto
[] = "auto";
480 static const char *endian_enum
[] =
487 static const char *set_endian_string
;
489 /* Called by ``show endian''. */
492 show_endian (char *args
, int from_tty
)
494 if (TARGET_BYTE_ORDER_AUTO
)
495 printf_unfiltered ("The target endianness is set automatically (currently %s endian)\n",
496 (TARGET_BYTE_ORDER
== BFD_ENDIAN_BIG
? "big" : "little"));
498 printf_unfiltered ("The target is assumed to be %s endian\n",
499 (TARGET_BYTE_ORDER
== BFD_ENDIAN_BIG
? "big" : "little"));
503 set_endian (char *ignore_args
, int from_tty
, struct cmd_list_element
*c
)
505 if (set_endian_string
== endian_auto
)
507 target_byte_order_auto
= 1;
509 else if (set_endian_string
== endian_little
)
511 target_byte_order_auto
= 0;
514 struct gdbarch_info info
;
515 gdbarch_info_init (&info
);
516 info
.byte_order
= BFD_ENDIAN_LITTLE
;
517 if (! gdbarch_update_p (info
))
519 printf_unfiltered ("Little endian target not supported by GDB\n");
524 target_byte_order
= BFD_ENDIAN_LITTLE
;
527 else if (set_endian_string
== endian_big
)
529 target_byte_order_auto
= 0;
532 struct gdbarch_info info
;
533 gdbarch_info_init (&info
);
534 info
.byte_order
= BFD_ENDIAN_BIG
;
535 if (! gdbarch_update_p (info
))
537 printf_unfiltered ("Big endian target not supported by GDB\n");
542 target_byte_order
= BFD_ENDIAN_BIG
;
546 internal_error (__FILE__
, __LINE__
,
547 "set_endian: bad value");
548 show_endian (NULL
, from_tty
);
551 /* Set the endianness from a BFD. */
554 set_endian_from_file (bfd
*abfd
)
558 internal_error (__FILE__
, __LINE__
,
559 "set_endian_from_file: not for multi-arch");
560 if (bfd_big_endian (abfd
))
561 want
= BFD_ENDIAN_BIG
;
563 want
= BFD_ENDIAN_LITTLE
;
564 if (TARGET_BYTE_ORDER_AUTO
)
565 target_byte_order
= want
;
566 else if (TARGET_BYTE_ORDER
!= want
)
567 warning ("%s endian file does not match %s endian target.",
568 want
== BFD_ENDIAN_BIG
? "big" : "little",
569 TARGET_BYTE_ORDER
== BFD_ENDIAN_BIG
? "big" : "little");
573 /* Functions to manipulate the architecture of the target */
575 enum set_arch
{ set_arch_auto
, set_arch_manual
};
577 int target_architecture_auto
= 1;
579 const char *set_architecture_string
;
581 /* Old way of changing the current architecture. */
583 extern const struct bfd_arch_info bfd_default_arch_struct
;
584 const struct bfd_arch_info
*target_architecture
= &bfd_default_arch_struct
;
585 int (*target_architecture_hook
) (const struct bfd_arch_info
*ap
);
588 arch_ok (const struct bfd_arch_info
*arch
)
591 internal_error (__FILE__
, __LINE__
,
592 "arch_ok: not multi-arched");
593 /* Should be performing the more basic check that the binary is
594 compatible with GDB. */
595 /* Check with the target that the architecture is valid. */
596 return (target_architecture_hook
== NULL
597 || target_architecture_hook (arch
));
601 set_arch (const struct bfd_arch_info
*arch
,
605 internal_error (__FILE__
, __LINE__
,
606 "set_arch: not multi-arched");
611 warning ("Target may not support %s architecture",
612 arch
->printable_name
);
613 target_architecture
= arch
;
615 case set_arch_manual
:
618 printf_unfiltered ("Target does not support `%s' architecture.\n",
619 arch
->printable_name
);
623 target_architecture_auto
= 0;
624 target_architecture
= arch
;
629 gdbarch_dump (current_gdbarch
, gdb_stdlog
);
632 /* Set the architecture from arch/machine (deprecated) */
635 set_architecture_from_arch_mach (enum bfd_architecture arch
,
638 const struct bfd_arch_info
*wanted
= bfd_lookup_arch (arch
, mach
);
640 internal_error (__FILE__
, __LINE__
,
641 "set_architecture_from_arch_mach: not multi-arched");
643 set_arch (wanted
, set_arch_manual
);
645 internal_error (__FILE__
, __LINE__
,
646 "gdbarch: hardwired architecture/machine not recognized");
649 /* Set the architecture from a BFD (deprecated) */
652 set_architecture_from_file (bfd
*abfd
)
654 const struct bfd_arch_info
*wanted
= bfd_get_arch_info (abfd
);
656 internal_error (__FILE__
, __LINE__
,
657 "set_architecture_from_file: not multi-arched");
658 if (target_architecture_auto
)
660 set_arch (wanted
, set_arch_auto
);
662 else if (wanted
!= target_architecture
)
664 warning ("%s architecture file may be incompatible with %s target.",
665 wanted
->printable_name
,
666 target_architecture
->printable_name
);
671 /* Called if the user enters ``show architecture'' without an
675 show_architecture (char *args
, int from_tty
)
678 arch
= TARGET_ARCHITECTURE
->printable_name
;
679 if (target_architecture_auto
)
680 printf_filtered ("The target architecture is set automatically (currently %s)\n", arch
);
682 printf_filtered ("The target architecture is assumed to be %s\n", arch
);
686 /* Called if the user enters ``set architecture'' with or without an
690 set_architecture (char *ignore_args
, int from_tty
, struct cmd_list_element
*c
)
692 if (strcmp (set_architecture_string
, "auto") == 0)
694 target_architecture_auto
= 1;
696 else if (GDB_MULTI_ARCH
)
698 struct gdbarch_info info
;
699 gdbarch_info_init (&info
);
700 info
.bfd_arch_info
= bfd_scan_arch (set_architecture_string
);
701 if (info
.bfd_arch_info
== NULL
)
702 internal_error (__FILE__
, __LINE__
,
703 "set_architecture: bfd_scan_arch failed");
704 if (gdbarch_update_p (info
))
705 target_architecture_auto
= 0;
707 printf_unfiltered ("Architecture `%s' not recognized.\n",
708 set_architecture_string
);
712 const struct bfd_arch_info
*arch
713 = bfd_scan_arch (set_architecture_string
);
715 internal_error (__FILE__
, __LINE__
,
716 "set_architecture: bfd_scan_arch failed");
717 set_arch (arch
, set_arch_manual
);
719 show_architecture (NULL
, from_tty
);
722 /* Set the dynamic target-system-dependent parameters (architecture,
723 byte-order) using information found in the BFD */
726 set_gdbarch_from_file (bfd
*abfd
)
730 struct gdbarch_info info
;
731 gdbarch_info_init (&info
);
733 if (! gdbarch_update_p (info
))
734 error ("Architecture of file not recognized.\n");
738 set_architecture_from_file (abfd
);
739 set_endian_from_file (abfd
);
743 /* Initialize the current architecture. Update the ``set
744 architecture'' command so that it specifies a list of valid
747 #ifdef DEFAULT_BFD_ARCH
748 extern const bfd_arch_info_type DEFAULT_BFD_ARCH
;
749 static const bfd_arch_info_type
*default_bfd_arch
= &DEFAULT_BFD_ARCH
;
751 static const bfd_arch_info_type
*default_bfd_arch
;
754 #ifdef DEFAULT_BFD_VEC
755 extern const bfd_target DEFAULT_BFD_VEC
;
756 static const bfd_target
*default_bfd_vec
= &DEFAULT_BFD_VEC
;
758 static const bfd_target
*default_bfd_vec
;
762 initialize_current_architecture (void)
764 const char **arches
= gdbarch_printable_names ();
766 /* determine a default architecture and byte order. */
767 struct gdbarch_info info
;
768 gdbarch_info_init (&info
);
770 /* Find a default architecture. */
771 if (info
.bfd_arch_info
== NULL
772 && default_bfd_arch
!= NULL
)
773 info
.bfd_arch_info
= default_bfd_arch
;
774 if (info
.bfd_arch_info
== NULL
)
776 /* Choose the architecture by taking the first one
778 const char *chosen
= arches
[0];
780 for (arch
= arches
; *arch
!= NULL
; arch
++)
782 if (strcmp (*arch
, chosen
) < 0)
786 internal_error (__FILE__
, __LINE__
,
787 "initialize_current_architecture: No arch");
788 info
.bfd_arch_info
= bfd_scan_arch (chosen
);
789 if (info
.bfd_arch_info
== NULL
)
790 internal_error (__FILE__
, __LINE__
,
791 "initialize_current_architecture: Arch not found");
794 /* Take several guesses at a byte order. */
795 if (info
.byte_order
== BFD_ENDIAN_UNKNOWN
796 && default_bfd_vec
!= NULL
)
798 /* Extract BFD's default vector's byte order. */
799 switch (default_bfd_vec
->byteorder
)
802 info
.byte_order
= BFD_ENDIAN_BIG
;
804 case BFD_ENDIAN_LITTLE
:
805 info
.byte_order
= BFD_ENDIAN_LITTLE
;
811 if (info
.byte_order
== BFD_ENDIAN_UNKNOWN
)
813 /* look for ``*el-*'' in the target name. */
815 chp
= strchr (target_name
, '-');
817 && chp
- 2 >= target_name
818 && strncmp (chp
- 2, "el", 2) == 0)
819 info
.byte_order
= BFD_ENDIAN_LITTLE
;
821 if (info
.byte_order
== BFD_ENDIAN_UNKNOWN
)
823 /* Wire it to big-endian!!! */
824 info
.byte_order
= BFD_ENDIAN_BIG
;
829 if (! gdbarch_update_p (info
))
831 internal_error (__FILE__
, __LINE__
,
832 "initialize_current_architecture: Selection of initial architecture failed");
837 /* If the multi-arch logic comes up with a byte-order (from BFD)
838 use it for the non-multi-arch case. */
839 if (info
.byte_order
!= BFD_ENDIAN_UNKNOWN
)
840 target_byte_order
= info
.byte_order
;
841 initialize_non_multiarch ();
844 /* Create the ``set architecture'' command appending ``auto'' to the
845 list of architectures. */
847 struct cmd_list_element
*c
;
848 /* Append ``auto''. */
850 for (nr
= 0; arches
[nr
] != NULL
; nr
++);
851 arches
= xrealloc (arches
, sizeof (char*) * (nr
+ 2));
852 arches
[nr
+ 0] = "auto";
853 arches
[nr
+ 1] = NULL
;
854 /* FIXME: add_set_enum_cmd() uses an array of ``char *'' instead
855 of ``const char *''. We just happen to know that the casts are
857 c
= add_set_enum_cmd ("architecture", class_support
,
858 arches
, &set_architecture_string
,
859 "Set architecture of target.",
861 set_cmd_sfunc (c
, set_architecture
);
862 add_alias_cmd ("processor", "architecture", class_support
, 1, &setlist
);
863 /* Don't use set_from_show - need to print both auto/manual and
865 add_cmd ("architecture", class_support
, show_architecture
,
866 "Show the current target architecture", &showlist
);
871 /* Initialize a gdbarch info to values that will be automatically
872 overridden. Note: Originally, this ``struct info'' was initialized
873 using memset(0). Unfortunatly, that ran into problems, namely
874 BFD_ENDIAN_BIG is zero. An explicit initialization function that
875 can explicitly set each field to a well defined value is used. */
878 gdbarch_info_init (struct gdbarch_info
*info
)
880 memset (info
, 0, sizeof (struct gdbarch_info
));
881 info
->byte_order
= BFD_ENDIAN_UNKNOWN
;
886 extern initialize_file_ftype _initialize_gdbarch_utils
;
889 _initialize_gdbarch_utils (void)
891 struct cmd_list_element
*c
;
892 c
= add_set_enum_cmd ("endian", class_support
,
893 endian_enum
, &set_endian_string
,
894 "Set endianness of target.",
896 set_cmd_sfunc (c
, set_endian
);
897 /* Don't use set_from_show - need to print both auto/manual and
899 add_cmd ("endian", class_support
, show_endian
,
900 "Show the current byte-order", &showlist
);