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. */
35 #include "breakpoint.h"
42 #include "gdb_string.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
);
94 /* Implementation of extract return value that grubs around in the
97 legacy_extract_return_value (struct type
*type
, struct regcache
*regcache
,
100 char *registers
= deprecated_grub_regcache_for_registers (regcache
);
101 DEPRECATED_EXTRACT_RETURN_VALUE (type
, registers
, valbuf
);
105 legacy_register_sim_regno (int regnum
)
107 /* Only makes sense to supply raw registers. */
108 gdb_assert (regnum
>= 0 && regnum
< NUM_REGS
);
109 /* NOTE: cagney/2002-05-13: The old code did it this way and it is
110 suspected that some GDB/SIM combinations may rely on this
111 behavour. The default should be one2one_register_sim_regno
113 if (REGISTER_NAME (regnum
) != NULL
114 && REGISTER_NAME (regnum
)[0] != '\0')
117 return LEGACY_SIM_REGNO_IGNORE
;
121 generic_frameless_function_invocation_not (struct frame_info
*fi
)
127 generic_return_value_on_stack_not (struct type
*type
)
133 generic_skip_trampoline_code (CORE_ADDR pc
)
139 generic_in_solib_call_trampoline (CORE_ADDR pc
, char *name
)
145 generic_in_solib_return_trampoline (CORE_ADDR pc
, char *name
)
151 generic_in_function_epilogue_p (struct gdbarch
*gdbarch
, CORE_ADDR pc
)
157 legacy_register_name (int i
)
159 #ifdef REGISTER_NAMES
160 static char *names
[] = REGISTER_NAMES
;
161 if (i
< 0 || i
>= (sizeof (names
) / sizeof (*names
)))
166 internal_error (__FILE__
, __LINE__
,
167 "legacy_register_name: called.");
172 #if defined (CALL_DUMMY)
173 LONGEST legacy_call_dummy_words
[] = CALL_DUMMY
;
175 LONGEST legacy_call_dummy_words
[1];
177 int legacy_sizeof_call_dummy_words
= sizeof (legacy_call_dummy_words
);
180 generic_remote_translate_xfer_address (CORE_ADDR gdb_addr
, int gdb_len
,
181 CORE_ADDR
* rem_addr
, int *rem_len
)
183 *rem_addr
= gdb_addr
;
188 generic_prologue_frameless_p (CORE_ADDR ip
)
190 return ip
== SKIP_PROLOGUE (ip
);
193 /* New/multi-arched targets should use the correct gdbarch field
194 instead of using this global pointer. */
196 legacy_print_insn (bfd_vma vma
, disassemble_info
*info
)
198 return (*tm_print_insn
) (vma
, info
);
201 /* Helper functions for INNER_THAN */
204 core_addr_lessthan (CORE_ADDR lhs
, CORE_ADDR rhs
)
210 core_addr_greaterthan (CORE_ADDR lhs
, CORE_ADDR rhs
)
216 /* Helper functions for TARGET_{FLOAT,DOUBLE}_FORMAT */
218 const struct floatformat
*
219 default_float_format (struct gdbarch
*gdbarch
)
222 int byte_order
= gdbarch_byte_order (gdbarch
);
224 int byte_order
= TARGET_BYTE_ORDER
;
229 return &floatformat_ieee_single_big
;
230 case BFD_ENDIAN_LITTLE
:
231 return &floatformat_ieee_single_little
;
233 internal_error (__FILE__
, __LINE__
,
234 "default_float_format: bad byte order");
239 const struct floatformat
*
240 default_double_format (struct gdbarch
*gdbarch
)
243 int byte_order
= gdbarch_byte_order (gdbarch
);
245 int byte_order
= TARGET_BYTE_ORDER
;
250 return &floatformat_ieee_double_big
;
251 case BFD_ENDIAN_LITTLE
:
252 return &floatformat_ieee_double_little
;
254 internal_error (__FILE__
, __LINE__
,
255 "default_double_format: bad byte order");
259 /* Misc helper functions for targets. */
262 frame_num_args_unknown (struct frame_info
*fi
)
269 generic_register_convertible_not (int num
)
275 /* Under some ABI's that specify the `struct convention' for returning
276 structures by value, by the time we've returned from the function,
277 the return value is sitting there in the caller's buffer, but GDB
278 has no way to find the address of that buffer.
280 On such architectures, use this function as your
281 extract_struct_value_address method. When asked to a struct
282 returned by value in this fashion, GDB will print a nice error
283 message, instead of garbage. */
285 generic_cannot_extract_struct_value_address (char *dummy
)
291 core_addr_identity (CORE_ADDR addr
)
297 no_op_reg_to_regnum (int reg
)
302 /* For use by frame_args_address and frame_locals_address. */
304 default_frame_address (struct frame_info
*fi
)
309 /* Default prepare_to_procced(). */
311 default_prepare_to_proceed (int select_it
)
316 /* Generic prepare_to_proceed(). This one should be suitable for most
317 targets that support threads. */
319 generic_prepare_to_proceed (int select_it
)
322 struct target_waitstatus wait_status
;
324 /* Get the last target status returned by target_wait(). */
325 get_last_target_status (&wait_ptid
, &wait_status
);
327 /* Make sure we were stopped either at a breakpoint, or because
329 if (wait_status
.kind
!= TARGET_WAITKIND_STOPPED
330 || (wait_status
.value
.sig
!= TARGET_SIGNAL_TRAP
&&
331 wait_status
.value
.sig
!= TARGET_SIGNAL_INT
))
336 if (!ptid_equal (wait_ptid
, minus_one_ptid
)
337 && !ptid_equal (inferior_ptid
, wait_ptid
))
339 /* Switched over from WAIT_PID. */
340 CORE_ADDR wait_pc
= read_pc_pid (wait_ptid
);
342 if (wait_pc
!= read_pc ())
346 /* Switch back to WAIT_PID thread. */
347 inferior_ptid
= wait_ptid
;
349 /* FIXME: This stuff came from switch_to_thread() in
350 thread.c (which should probably be a public function). */
351 flush_cached_frames ();
352 registers_changed ();
354 select_frame (get_current_frame ());
356 /* We return 1 to indicate that there is a breakpoint here,
357 so we need to step over it before continuing to avoid
358 hitting it straight away. */
359 if (breakpoint_here_p (wait_pc
))
370 init_frame_pc_noop (int fromleaf
, struct frame_info
*prev
)
376 init_frame_pc_default (int fromleaf
, struct frame_info
*prev
)
379 prev
->pc
= SAVED_PC_AFTER_CALL (prev
->next
);
380 else if (prev
->next
!= NULL
)
381 prev
->pc
= FRAME_SAVED_PC (prev
->next
);
383 prev
->pc
= read_pc ();
387 default_elf_make_msymbol_special (asymbol
*sym
, struct minimal_symbol
*msym
)
393 default_coff_make_msymbol_special (int val
, struct minimal_symbol
*msym
)
399 cannot_register_not (int regnum
)
404 /* Legacy version of target_virtual_frame_pointer(). Assumes that
405 there is an FP_REGNUM and that it is the same, cooked or raw. */
408 legacy_virtual_frame_pointer (CORE_ADDR pc
,
410 LONGEST
*frame_offset
)
412 gdb_assert (FP_REGNUM
>= 0);
413 *frame_regnum
= FP_REGNUM
;
417 /* Assume the world is sane, every register's virtual and real size
421 generic_register_size (int regnum
)
423 gdb_assert (regnum
>= 0 && regnum
< NUM_REGS
+ NUM_PSEUDO_REGS
);
424 return TYPE_LENGTH (REGISTER_VIRTUAL_TYPE (regnum
));
427 #if !defined (IN_SIGTRAMP)
428 #if defined (SIGTRAMP_START)
429 #define IN_SIGTRAMP(pc, name) \
430 ((pc) >= SIGTRAMP_START(pc) \
431 && (pc) < SIGTRAMP_END(pc) \
434 #define IN_SIGTRAMP(pc, name) \
435 (name && STREQ ("_sigtramp", name))
439 /* Assume all registers are adjacent. */
442 generic_register_byte (int regnum
)
446 gdb_assert (regnum
>= 0 && regnum
< NUM_REGS
+ NUM_PSEUDO_REGS
);
448 for (i
= 0; i
< regnum
; i
++)
450 byte
+= TYPE_LENGTH (REGISTER_VIRTUAL_TYPE (i
));
457 legacy_pc_in_sigtramp (CORE_ADDR pc
, char *name
)
459 return IN_SIGTRAMP(pc
, name
);
463 legacy_convert_register_p (int regnum
)
465 return REGISTER_CONVERTIBLE (regnum
);
469 legacy_register_to_value (int regnum
, struct type
*type
,
470 char *from
, char *to
)
472 REGISTER_CONVERT_TO_VIRTUAL (regnum
, type
, from
, to
);
476 legacy_value_to_register (struct type
*type
, int regnum
,
477 char *from
, char *to
)
479 REGISTER_CONVERT_TO_RAW (type
, regnum
, from
, to
);
483 /* Functions to manipulate the endianness of the target. */
485 /* ``target_byte_order'' is only used when non- multi-arch.
486 Multi-arch targets obtain the current byte order using the
487 TARGET_BYTE_ORDER gdbarch method.
489 The choice of initial value is entirely arbitrary. During startup,
490 the function initialize_current_architecture() updates this value
491 based on default byte-order information extracted from BFD. */
492 int target_byte_order
= BFD_ENDIAN_BIG
;
493 int target_byte_order_auto
= 1;
495 static const char endian_big
[] = "big";
496 static const char endian_little
[] = "little";
497 static const char endian_auto
[] = "auto";
498 static const char *endian_enum
[] =
505 static const char *set_endian_string
;
507 /* Called by ``show endian''. */
510 show_endian (char *args
, int from_tty
)
512 if (TARGET_BYTE_ORDER_AUTO
)
513 printf_unfiltered ("The target endianness is set automatically (currently %s endian)\n",
514 (TARGET_BYTE_ORDER
== BFD_ENDIAN_BIG
? "big" : "little"));
516 printf_unfiltered ("The target is assumed to be %s endian\n",
517 (TARGET_BYTE_ORDER
== BFD_ENDIAN_BIG
? "big" : "little"));
521 set_endian (char *ignore_args
, int from_tty
, struct cmd_list_element
*c
)
523 if (set_endian_string
== endian_auto
)
525 target_byte_order_auto
= 1;
527 else if (set_endian_string
== endian_little
)
529 target_byte_order_auto
= 0;
532 struct gdbarch_info info
;
533 gdbarch_info_init (&info
);
534 info
.byte_order
= BFD_ENDIAN_LITTLE
;
535 if (! gdbarch_update_p (info
))
537 printf_unfiltered ("Little endian target not supported by GDB\n");
542 target_byte_order
= BFD_ENDIAN_LITTLE
;
545 else if (set_endian_string
== endian_big
)
547 target_byte_order_auto
= 0;
550 struct gdbarch_info info
;
551 gdbarch_info_init (&info
);
552 info
.byte_order
= BFD_ENDIAN_BIG
;
553 if (! gdbarch_update_p (info
))
555 printf_unfiltered ("Big endian target not supported by GDB\n");
560 target_byte_order
= BFD_ENDIAN_BIG
;
564 internal_error (__FILE__
, __LINE__
,
565 "set_endian: bad value");
566 show_endian (NULL
, from_tty
);
569 /* Set the endianness from a BFD. */
572 set_endian_from_file (bfd
*abfd
)
576 internal_error (__FILE__
, __LINE__
,
577 "set_endian_from_file: not for multi-arch");
578 if (bfd_big_endian (abfd
))
579 want
= BFD_ENDIAN_BIG
;
581 want
= BFD_ENDIAN_LITTLE
;
582 if (TARGET_BYTE_ORDER_AUTO
)
583 target_byte_order
= want
;
584 else if (TARGET_BYTE_ORDER
!= want
)
585 warning ("%s endian file does not match %s endian target.",
586 want
== BFD_ENDIAN_BIG
? "big" : "little",
587 TARGET_BYTE_ORDER
== BFD_ENDIAN_BIG
? "big" : "little");
591 /* Functions to manipulate the architecture of the target */
593 enum set_arch
{ set_arch_auto
, set_arch_manual
};
595 int target_architecture_auto
= 1;
597 const char *set_architecture_string
;
599 /* Old way of changing the current architecture. */
601 extern const struct bfd_arch_info bfd_default_arch_struct
;
602 const struct bfd_arch_info
*target_architecture
= &bfd_default_arch_struct
;
603 int (*target_architecture_hook
) (const struct bfd_arch_info
*ap
);
606 arch_ok (const struct bfd_arch_info
*arch
)
609 internal_error (__FILE__
, __LINE__
,
610 "arch_ok: not multi-arched");
611 /* Should be performing the more basic check that the binary is
612 compatible with GDB. */
613 /* Check with the target that the architecture is valid. */
614 return (target_architecture_hook
== NULL
615 || target_architecture_hook (arch
));
619 set_arch (const struct bfd_arch_info
*arch
,
623 internal_error (__FILE__
, __LINE__
,
624 "set_arch: not multi-arched");
629 warning ("Target may not support %s architecture",
630 arch
->printable_name
);
631 target_architecture
= arch
;
633 case set_arch_manual
:
636 printf_unfiltered ("Target does not support `%s' architecture.\n",
637 arch
->printable_name
);
641 target_architecture_auto
= 0;
642 target_architecture
= arch
;
647 gdbarch_dump (current_gdbarch
, gdb_stdlog
);
650 /* Set the architecture from arch/machine (deprecated) */
653 set_architecture_from_arch_mach (enum bfd_architecture arch
,
656 const struct bfd_arch_info
*wanted
= bfd_lookup_arch (arch
, mach
);
658 internal_error (__FILE__
, __LINE__
,
659 "set_architecture_from_arch_mach: not multi-arched");
661 set_arch (wanted
, set_arch_manual
);
663 internal_error (__FILE__
, __LINE__
,
664 "gdbarch: hardwired architecture/machine not recognized");
667 /* Set the architecture from a BFD (deprecated) */
670 set_architecture_from_file (bfd
*abfd
)
672 const struct bfd_arch_info
*wanted
= bfd_get_arch_info (abfd
);
674 internal_error (__FILE__
, __LINE__
,
675 "set_architecture_from_file: not multi-arched");
676 if (target_architecture_auto
)
678 set_arch (wanted
, set_arch_auto
);
680 else if (wanted
!= target_architecture
)
682 warning ("%s architecture file may be incompatible with %s target.",
683 wanted
->printable_name
,
684 target_architecture
->printable_name
);
689 /* Called if the user enters ``show architecture'' without an
693 show_architecture (char *args
, int from_tty
)
696 arch
= TARGET_ARCHITECTURE
->printable_name
;
697 if (target_architecture_auto
)
698 printf_filtered ("The target architecture is set automatically (currently %s)\n", arch
);
700 printf_filtered ("The target architecture is assumed to be %s\n", arch
);
704 /* Called if the user enters ``set architecture'' with or without an
708 set_architecture (char *ignore_args
, int from_tty
, struct cmd_list_element
*c
)
710 if (strcmp (set_architecture_string
, "auto") == 0)
712 target_architecture_auto
= 1;
714 else if (GDB_MULTI_ARCH
)
716 struct gdbarch_info info
;
717 gdbarch_info_init (&info
);
718 info
.bfd_arch_info
= bfd_scan_arch (set_architecture_string
);
719 if (info
.bfd_arch_info
== NULL
)
720 internal_error (__FILE__
, __LINE__
,
721 "set_architecture: bfd_scan_arch failed");
722 if (gdbarch_update_p (info
))
723 target_architecture_auto
= 0;
725 printf_unfiltered ("Architecture `%s' not recognized.\n",
726 set_architecture_string
);
730 const struct bfd_arch_info
*arch
731 = bfd_scan_arch (set_architecture_string
);
733 internal_error (__FILE__
, __LINE__
,
734 "set_architecture: bfd_scan_arch failed");
735 set_arch (arch
, set_arch_manual
);
737 show_architecture (NULL
, from_tty
);
740 /* Set the dynamic target-system-dependent parameters (architecture,
741 byte-order) using information found in the BFD */
744 set_gdbarch_from_file (bfd
*abfd
)
748 struct gdbarch_info info
;
749 gdbarch_info_init (&info
);
751 if (! gdbarch_update_p (info
))
752 error ("Architecture of file not recognized.\n");
756 set_architecture_from_file (abfd
);
757 set_endian_from_file (abfd
);
761 /* Initialize the current architecture. Update the ``set
762 architecture'' command so that it specifies a list of valid
765 #ifdef DEFAULT_BFD_ARCH
766 extern const bfd_arch_info_type DEFAULT_BFD_ARCH
;
767 static const bfd_arch_info_type
*default_bfd_arch
= &DEFAULT_BFD_ARCH
;
769 static const bfd_arch_info_type
*default_bfd_arch
;
772 #ifdef DEFAULT_BFD_VEC
773 extern const bfd_target DEFAULT_BFD_VEC
;
774 static const bfd_target
*default_bfd_vec
= &DEFAULT_BFD_VEC
;
776 static const bfd_target
*default_bfd_vec
;
780 initialize_current_architecture (void)
782 const char **arches
= gdbarch_printable_names ();
784 /* determine a default architecture and byte order. */
785 struct gdbarch_info info
;
786 gdbarch_info_init (&info
);
788 /* Find a default architecture. */
789 if (info
.bfd_arch_info
== NULL
790 && default_bfd_arch
!= NULL
)
791 info
.bfd_arch_info
= default_bfd_arch
;
792 if (info
.bfd_arch_info
== NULL
)
794 /* Choose the architecture by taking the first one
796 const char *chosen
= arches
[0];
798 for (arch
= arches
; *arch
!= NULL
; arch
++)
800 if (strcmp (*arch
, chosen
) < 0)
804 internal_error (__FILE__
, __LINE__
,
805 "initialize_current_architecture: No arch");
806 info
.bfd_arch_info
= bfd_scan_arch (chosen
);
807 if (info
.bfd_arch_info
== NULL
)
808 internal_error (__FILE__
, __LINE__
,
809 "initialize_current_architecture: Arch not found");
812 /* Take several guesses at a byte order. */
813 if (info
.byte_order
== BFD_ENDIAN_UNKNOWN
814 && default_bfd_vec
!= NULL
)
816 /* Extract BFD's default vector's byte order. */
817 switch (default_bfd_vec
->byteorder
)
820 info
.byte_order
= BFD_ENDIAN_BIG
;
822 case BFD_ENDIAN_LITTLE
:
823 info
.byte_order
= BFD_ENDIAN_LITTLE
;
829 if (info
.byte_order
== BFD_ENDIAN_UNKNOWN
)
831 /* look for ``*el-*'' in the target name. */
833 chp
= strchr (target_name
, '-');
835 && chp
- 2 >= target_name
836 && strncmp (chp
- 2, "el", 2) == 0)
837 info
.byte_order
= BFD_ENDIAN_LITTLE
;
839 if (info
.byte_order
== BFD_ENDIAN_UNKNOWN
)
841 /* Wire it to big-endian!!! */
842 info
.byte_order
= BFD_ENDIAN_BIG
;
847 if (! gdbarch_update_p (info
))
849 internal_error (__FILE__
, __LINE__
,
850 "initialize_current_architecture: Selection of initial architecture failed");
855 /* If the multi-arch logic comes up with a byte-order (from BFD)
856 use it for the non-multi-arch case. */
857 if (info
.byte_order
!= BFD_ENDIAN_UNKNOWN
)
858 target_byte_order
= info
.byte_order
;
859 initialize_non_multiarch ();
862 /* Create the ``set architecture'' command appending ``auto'' to the
863 list of architectures. */
865 struct cmd_list_element
*c
;
866 /* Append ``auto''. */
868 for (nr
= 0; arches
[nr
] != NULL
; nr
++);
869 arches
= xrealloc (arches
, sizeof (char*) * (nr
+ 2));
870 arches
[nr
+ 0] = "auto";
871 arches
[nr
+ 1] = NULL
;
872 /* FIXME: add_set_enum_cmd() uses an array of ``char *'' instead
873 of ``const char *''. We just happen to know that the casts are
875 c
= add_set_enum_cmd ("architecture", class_support
,
876 arches
, &set_architecture_string
,
877 "Set architecture of target.",
879 set_cmd_sfunc (c
, set_architecture
);
880 add_alias_cmd ("processor", "architecture", class_support
, 1, &setlist
);
881 /* Don't use set_from_show - need to print both auto/manual and
883 add_cmd ("architecture", class_support
, show_architecture
,
884 "Show the current target architecture", &showlist
);
889 /* Initialize a gdbarch info to values that will be automatically
890 overridden. Note: Originally, this ``struct info'' was initialized
891 using memset(0). Unfortunatly, that ran into problems, namely
892 BFD_ENDIAN_BIG is zero. An explicit initialization function that
893 can explicitly set each field to a well defined value is used. */
896 gdbarch_info_init (struct gdbarch_info
*info
)
898 memset (info
, 0, sizeof (struct gdbarch_info
));
899 info
->byte_order
= BFD_ENDIAN_UNKNOWN
;
904 extern initialize_file_ftype _initialize_gdbarch_utils
;
907 _initialize_gdbarch_utils (void)
909 struct cmd_list_element
*c
;
910 c
= add_set_enum_cmd ("endian", class_support
,
911 endian_enum
, &set_endian_string
,
912 "Set endianness of target.",
914 set_cmd_sfunc (c
, set_endian
);
915 /* Don't use set_from_show - need to print both auto/manual and
917 add_cmd ("endian", class_support
, show_endian
,
918 "Show the current byte-order", &showlist
);