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"
41 #include "gdb_assert.h"
45 #include "floatformat.h"
47 /* Use the program counter to determine the contents and size
48 of a breakpoint instruction. If no target-dependent macro
49 BREAKPOINT_FROM_PC has been defined to implement this function,
50 assume that the breakpoint doesn't depend on the PC, and
51 use the values of the BIG_BREAKPOINT and LITTLE_BREAKPOINT macros.
52 Return a pointer to a string of bytes that encode a breakpoint
53 instruction, stores the length of the string to *lenptr,
54 and optionally adjust the pc to point to the correct memory location
55 for inserting the breakpoint. */
58 legacy_breakpoint_from_pc (CORE_ADDR
* pcptr
, int *lenptr
)
60 /* {BIG_,LITTLE_}BREAKPOINT is the sequence of bytes we insert for a
61 breakpoint. On some machines, breakpoints are handled by the
62 target environment and we don't have to worry about them here. */
64 if (TARGET_BYTE_ORDER
== BIG_ENDIAN
)
66 static unsigned char big_break_insn
[] = BIG_BREAKPOINT
;
67 *lenptr
= sizeof (big_break_insn
);
68 return big_break_insn
;
71 #ifdef LITTLE_BREAKPOINT
72 if (TARGET_BYTE_ORDER
!= BIG_ENDIAN
)
74 static unsigned char little_break_insn
[] = LITTLE_BREAKPOINT
;
75 *lenptr
= sizeof (little_break_insn
);
76 return little_break_insn
;
81 static unsigned char break_insn
[] = BREAKPOINT
;
82 *lenptr
= sizeof (break_insn
);
91 generic_frameless_function_invocation_not (struct frame_info
*fi
)
97 generic_return_value_on_stack_not (struct type
*type
)
103 generic_skip_trampoline_code (CORE_ADDR pc
)
109 generic_in_solib_call_trampoline (CORE_ADDR pc
, char *name
)
115 generic_in_function_epilogue_p (struct gdbarch
*gdbarch
, CORE_ADDR pc
)
121 legacy_register_name (int i
)
123 #ifdef REGISTER_NAMES
124 static char *names
[] = REGISTER_NAMES
;
125 if (i
< 0 || i
>= (sizeof (names
) / sizeof (*names
)))
130 internal_error (__FILE__
, __LINE__
,
131 "legacy_register_name: called.");
136 #if defined (CALL_DUMMY)
137 LONGEST legacy_call_dummy_words
[] = CALL_DUMMY
;
139 LONGEST legacy_call_dummy_words
[1];
141 int legacy_sizeof_call_dummy_words
= sizeof (legacy_call_dummy_words
);
144 generic_remote_translate_xfer_address (CORE_ADDR gdb_addr
, int gdb_len
,
145 CORE_ADDR
* rem_addr
, int *rem_len
)
147 *rem_addr
= gdb_addr
;
152 generic_prologue_frameless_p (CORE_ADDR ip
)
154 #ifdef SKIP_PROLOGUE_FRAMELESS_P
155 return ip
== SKIP_PROLOGUE_FRAMELESS_P (ip
);
157 return ip
== SKIP_PROLOGUE (ip
);
161 /* New/multi-arched targets should use the correct gdbarch field
162 instead of using this global pointer. */
164 legacy_print_insn (bfd_vma vma
, disassemble_info
*info
)
166 return (*tm_print_insn
) (vma
, info
);
169 /* Helper functions for INNER_THAN */
172 core_addr_lessthan (CORE_ADDR lhs
, CORE_ADDR rhs
)
178 core_addr_greaterthan (CORE_ADDR lhs
, CORE_ADDR rhs
)
184 /* Helper functions for TARGET_{FLOAT,DOUBLE}_FORMAT */
186 const struct floatformat
*
187 default_float_format (struct gdbarch
*gdbarch
)
190 int byte_order
= gdbarch_byte_order (gdbarch
);
192 int byte_order
= TARGET_BYTE_ORDER
;
197 return &floatformat_ieee_single_big
;
198 case BFD_ENDIAN_LITTLE
:
199 return &floatformat_ieee_single_little
;
201 internal_error (__FILE__
, __LINE__
,
202 "default_float_format: bad byte order");
207 const struct floatformat
*
208 default_double_format (struct gdbarch
*gdbarch
)
211 int byte_order
= gdbarch_byte_order (gdbarch
);
213 int byte_order
= TARGET_BYTE_ORDER
;
218 return &floatformat_ieee_double_big
;
219 case BFD_ENDIAN_LITTLE
:
220 return &floatformat_ieee_double_little
;
222 internal_error (__FILE__
, __LINE__
,
223 "default_double_format: bad byte order");
227 /* Misc helper functions for targets. */
230 frame_num_args_unknown (struct frame_info
*fi
)
237 generic_register_convertible_not (int num
)
243 /* Under some ABI's that specify the `struct convention' for returning
244 structures by value, by the time we've returned from the function,
245 the return value is sitting there in the caller's buffer, but GDB
246 has no way to find the address of that buffer.
248 On such architectures, use this function as your
249 extract_struct_value_address method. When asked to a struct
250 returned by value in this fashion, GDB will print a nice error
251 message, instead of garbage. */
253 generic_cannot_extract_struct_value_address (char *dummy
)
259 default_register_sim_regno (int num
)
266 core_addr_identity (CORE_ADDR addr
)
272 no_op_reg_to_regnum (int reg
)
277 /* For use by frame_args_address and frame_locals_address. */
279 default_frame_address (struct frame_info
*fi
)
284 /* Default prepare_to_procced(). */
286 default_prepare_to_proceed (int select_it
)
291 /* Generic prepare_to_proceed(). This one should be suitable for most
292 targets that support threads. */
294 generic_prepare_to_proceed (int select_it
)
297 struct target_waitstatus wait_status
;
299 /* Get the last target status returned by target_wait(). */
300 get_last_target_status (&wait_ptid
, &wait_status
);
302 /* Make sure we were stopped either at a breakpoint, or because
304 if (wait_status
.kind
!= TARGET_WAITKIND_STOPPED
305 || (wait_status
.value
.sig
!= TARGET_SIGNAL_TRAP
&&
306 wait_status
.value
.sig
!= TARGET_SIGNAL_INT
))
311 if (!ptid_equal (wait_ptid
, minus_one_ptid
)
312 && !ptid_equal (inferior_ptid
, wait_ptid
))
314 /* Switched over from WAIT_PID. */
315 CORE_ADDR wait_pc
= read_pc_pid (wait_ptid
);
317 if (wait_pc
!= read_pc ())
321 /* Switch back to WAIT_PID thread. */
322 inferior_ptid
= wait_ptid
;
324 /* FIXME: This stuff came from switch_to_thread() in
325 thread.c (which should probably be a public function). */
326 flush_cached_frames ();
327 registers_changed ();
329 select_frame (get_current_frame (), 0);
331 /* We return 1 to indicate that there is a breakpoint here,
332 so we need to step over it before continuing to avoid
333 hitting it straight away. */
334 if (breakpoint_here_p (wait_pc
))
345 init_frame_pc_noop (int fromleaf
, struct frame_info
*prev
)
351 init_frame_pc_default (int fromleaf
, struct frame_info
*prev
)
354 prev
->pc
= SAVED_PC_AFTER_CALL (prev
->next
);
355 else if (prev
->next
!= NULL
)
356 prev
->pc
= FRAME_SAVED_PC (prev
->next
);
358 prev
->pc
= read_pc ();
362 cannot_register_not (int regnum
)
367 /* Legacy version of target_virtual_frame_pointer(). Assumes that
368 there is an FP_REGNUM and that it is the same, cooked or raw. */
371 legacy_virtual_frame_pointer (CORE_ADDR pc
,
373 LONGEST
*frame_offset
)
375 gdb_assert (FP_REGNUM
>= 0);
376 *frame_regnum
= FP_REGNUM
;
380 /* Assume the world is flat. Every register is large enough to fit a
384 generic_register_raw_size (int regnum
)
386 gdb_assert (regnum
>= 0 && regnum
< NUM_REGS
+ NUM_PSEUDO_REGS
);
387 return TARGET_INT_BIT
/ HOST_CHAR_BIT
;
390 /* Assume the virtual size corresponds to the virtual type. */
393 generic_register_virtual_size (int regnum
)
395 return TYPE_LENGTH (REGISTER_VIRTUAL_TYPE (regnum
));
399 /* Functions to manipulate the endianness of the target. */
401 #ifdef TARGET_BYTE_ORDER_SELECTABLE
402 /* compat - Catch old targets that expect a selectable byte-order to
403 default to BIG_ENDIAN */
404 #ifndef TARGET_BYTE_ORDER_DEFAULT
405 #define TARGET_BYTE_ORDER_DEFAULT BIG_ENDIAN
408 #if !TARGET_BYTE_ORDER_SELECTABLE_P
409 #ifndef TARGET_BYTE_ORDER_DEFAULT
410 /* compat - Catch old non byte-order selectable targets that do not
411 define TARGET_BYTE_ORDER_DEFAULT and instead expect
412 TARGET_BYTE_ORDER to be used as the default. For targets that
413 defined neither TARGET_BYTE_ORDER nor TARGET_BYTE_ORDER_DEFAULT the
414 below will get a strange compiler warning. */
415 #define TARGET_BYTE_ORDER_DEFAULT TARGET_BYTE_ORDER
418 #ifndef TARGET_BYTE_ORDER_DEFAULT
419 #define TARGET_BYTE_ORDER_DEFAULT BIG_ENDIAN /* arbitrary */
421 /* ``target_byte_order'' is only used when non- multi-arch.
422 Multi-arch targets obtain the current byte order using
423 TARGET_BYTE_ORDER which is controlled by gdbarch.*. */
424 int target_byte_order
= TARGET_BYTE_ORDER_DEFAULT
;
425 int target_byte_order_auto
= 1;
427 static const char endian_big
[] = "big";
428 static const char endian_little
[] = "little";
429 static const char endian_auto
[] = "auto";
430 static const char *endian_enum
[] =
437 static const char *set_endian_string
;
439 /* Called by ``show endian''. */
442 show_endian (char *args
, int from_tty
)
444 if (TARGET_BYTE_ORDER_AUTO
)
445 printf_unfiltered ("The target endianness is set automatically (currently %s endian)\n",
446 (TARGET_BYTE_ORDER
== BIG_ENDIAN
? "big" : "little"));
448 printf_unfiltered ("The target is assumed to be %s endian\n",
449 (TARGET_BYTE_ORDER
== BIG_ENDIAN
? "big" : "little"));
453 set_endian (char *ignore_args
, int from_tty
, struct cmd_list_element
*c
)
455 if (!TARGET_BYTE_ORDER_SELECTABLE_P
)
457 printf_unfiltered ("Byte order is not selectable.");
459 else if (set_endian_string
== endian_auto
)
461 target_byte_order_auto
= 1;
463 else if (set_endian_string
== endian_little
)
465 target_byte_order_auto
= 0;
468 struct gdbarch_info info
;
469 memset (&info
, 0, sizeof info
);
470 info
.byte_order
= BFD_ENDIAN_LITTLE
;
471 if (! gdbarch_update_p (info
))
473 printf_unfiltered ("Little endian target not supported by GDB\n");
478 target_byte_order
= BFD_ENDIAN_LITTLE
;
481 else if (set_endian_string
== endian_big
)
483 target_byte_order_auto
= 0;
486 struct gdbarch_info info
;
487 memset (&info
, 0, sizeof info
);
488 info
.byte_order
= BIG_ENDIAN
;
489 if (! gdbarch_update_p (info
))
491 printf_unfiltered ("Big endian target not supported by GDB\n");
496 target_byte_order
= BIG_ENDIAN
;
500 internal_error (__FILE__
, __LINE__
,
501 "set_endian: bad value");
502 show_endian (NULL
, from_tty
);
505 /* Set the endianness from a BFD. */
508 set_endian_from_file (bfd
*abfd
)
511 internal_error (__FILE__
, __LINE__
,
512 "set_endian_from_file: not for multi-arch");
513 if (TARGET_BYTE_ORDER_SELECTABLE_P
)
517 if (bfd_big_endian (abfd
))
520 want
= BFD_ENDIAN_LITTLE
;
521 if (TARGET_BYTE_ORDER_AUTO
)
522 target_byte_order
= want
;
523 else if (TARGET_BYTE_ORDER
!= want
)
524 warning ("%s endian file does not match %s endian target.",
525 want
== BIG_ENDIAN
? "big" : "little",
526 TARGET_BYTE_ORDER
== BIG_ENDIAN
? "big" : "little");
530 if (bfd_big_endian (abfd
)
531 ? TARGET_BYTE_ORDER
!= BIG_ENDIAN
532 : TARGET_BYTE_ORDER
== BIG_ENDIAN
)
533 warning ("%s endian file does not match %s endian target.",
534 bfd_big_endian (abfd
) ? "big" : "little",
535 TARGET_BYTE_ORDER
== BIG_ENDIAN
? "big" : "little");
540 /* Functions to manipulate the architecture of the target */
542 enum set_arch
{ set_arch_auto
, set_arch_manual
};
544 int target_architecture_auto
= 1;
546 const char *set_architecture_string
;
548 /* Old way of changing the current architecture. */
550 extern const struct bfd_arch_info bfd_default_arch_struct
;
551 const struct bfd_arch_info
*target_architecture
= &bfd_default_arch_struct
;
552 int (*target_architecture_hook
) (const struct bfd_arch_info
*ap
);
555 arch_ok (const struct bfd_arch_info
*arch
)
558 internal_error (__FILE__
, __LINE__
,
559 "arch_ok: not multi-arched");
560 /* Should be performing the more basic check that the binary is
561 compatible with GDB. */
562 /* Check with the target that the architecture is valid. */
563 return (target_architecture_hook
== NULL
564 || target_architecture_hook (arch
));
568 set_arch (const struct bfd_arch_info
*arch
,
572 internal_error (__FILE__
, __LINE__
,
573 "set_arch: not multi-arched");
578 warning ("Target may not support %s architecture",
579 arch
->printable_name
);
580 target_architecture
= arch
;
582 case set_arch_manual
:
585 printf_unfiltered ("Target does not support `%s' architecture.\n",
586 arch
->printable_name
);
590 target_architecture_auto
= 0;
591 target_architecture
= arch
;
596 gdbarch_dump (current_gdbarch
, gdb_stdlog
);
599 /* Set the architecture from arch/machine (deprecated) */
602 set_architecture_from_arch_mach (enum bfd_architecture arch
,
605 const struct bfd_arch_info
*wanted
= bfd_lookup_arch (arch
, mach
);
607 internal_error (__FILE__
, __LINE__
,
608 "set_architecture_from_arch_mach: not multi-arched");
610 set_arch (wanted
, set_arch_manual
);
612 internal_error (__FILE__
, __LINE__
,
613 "gdbarch: hardwired architecture/machine not recognized");
616 /* Set the architecture from a BFD (deprecated) */
619 set_architecture_from_file (bfd
*abfd
)
621 const struct bfd_arch_info
*wanted
= bfd_get_arch_info (abfd
);
623 internal_error (__FILE__
, __LINE__
,
624 "set_architecture_from_file: not multi-arched");
625 if (target_architecture_auto
)
627 set_arch (wanted
, set_arch_auto
);
629 else if (wanted
!= target_architecture
)
631 warning ("%s architecture file may be incompatible with %s target.",
632 wanted
->printable_name
,
633 target_architecture
->printable_name
);
638 /* Called if the user enters ``show architecture'' without an
642 show_architecture (char *args
, int from_tty
)
645 arch
= TARGET_ARCHITECTURE
->printable_name
;
646 if (target_architecture_auto
)
647 printf_filtered ("The target architecture is set automatically (currently %s)\n", arch
);
649 printf_filtered ("The target architecture is assumed to be %s\n", arch
);
653 /* Called if the user enters ``set architecture'' with or without an
657 set_architecture (char *ignore_args
, int from_tty
, struct cmd_list_element
*c
)
659 if (strcmp (set_architecture_string
, "auto") == 0)
661 target_architecture_auto
= 1;
663 else if (GDB_MULTI_ARCH
)
665 struct gdbarch_info info
;
666 memset (&info
, 0, sizeof info
);
667 info
.bfd_arch_info
= bfd_scan_arch (set_architecture_string
);
668 if (info
.bfd_arch_info
== NULL
)
669 internal_error (__FILE__
, __LINE__
,
670 "set_architecture: bfd_scan_arch failed");
671 if (gdbarch_update_p (info
))
672 target_architecture_auto
= 0;
674 printf_unfiltered ("Architecture `%s' not recognized.\n",
675 set_architecture_string
);
679 const struct bfd_arch_info
*arch
680 = bfd_scan_arch (set_architecture_string
);
682 internal_error (__FILE__
, __LINE__
,
683 "set_architecture: bfd_scan_arch failed");
684 set_arch (arch
, set_arch_manual
);
686 show_architecture (NULL
, from_tty
);
689 /* Set the dynamic target-system-dependent parameters (architecture,
690 byte-order) using information found in the BFD */
693 set_gdbarch_from_file (bfd
*abfd
)
697 struct gdbarch_info info
;
698 memset (&info
, 0, sizeof info
);
700 if (! gdbarch_update_p (info
))
701 error ("Architecture of file not recognized.\n");
705 set_architecture_from_file (abfd
);
706 set_endian_from_file (abfd
);
710 /* Initialize the current architecture. Update the ``set
711 architecture'' command so that it specifies a list of valid
714 #ifdef DEFAULT_BFD_ARCH
715 extern const bfd_arch_info_type DEFAULT_BFD_ARCH
;
716 static const bfd_arch_info_type
*default_bfd_arch
= &DEFAULT_BFD_ARCH
;
718 static const bfd_arch_info_type
*default_bfd_arch
;
721 #ifdef DEFAULT_BFD_VEC
722 extern const bfd_target DEFAULT_BFD_VEC
;
723 static const bfd_target
*default_bfd_vec
= &DEFAULT_BFD_VEC
;
725 static const bfd_target
*default_bfd_vec
;
729 initialize_current_architecture (void)
731 const char **arches
= gdbarch_printable_names ();
733 /* determine a default architecture and byte order. */
734 struct gdbarch_info info
;
735 memset (&info
, 0, sizeof (info
));
737 /* Find a default architecture. */
738 if (info
.bfd_arch_info
== NULL
739 && default_bfd_arch
!= NULL
)
740 info
.bfd_arch_info
= default_bfd_arch
;
741 if (info
.bfd_arch_info
== NULL
)
743 /* Choose the architecture by taking the first one
745 const char *chosen
= arches
[0];
747 for (arch
= arches
; *arch
!= NULL
; arch
++)
749 if (strcmp (*arch
, chosen
) < 0)
753 internal_error (__FILE__
, __LINE__
,
754 "initialize_current_architecture: No arch");
755 info
.bfd_arch_info
= bfd_scan_arch (chosen
);
756 if (info
.bfd_arch_info
== NULL
)
757 internal_error (__FILE__
, __LINE__
,
758 "initialize_current_architecture: Arch not found");
761 /* take several guesses at a byte order. */
762 /* NB: can't use TARGET_BYTE_ORDER_DEFAULT as its definition is
764 if (info
.byte_order
== 0
765 && default_bfd_vec
!= NULL
)
767 /* Extract BFD's default vector's byte order. */
768 switch (default_bfd_vec
->byteorder
)
771 info
.byte_order
= BIG_ENDIAN
;
773 case BFD_ENDIAN_LITTLE
:
774 info
.byte_order
= BFD_ENDIAN_LITTLE
;
780 if (info
.byte_order
== 0)
782 /* look for ``*el-*'' in the target name. */
784 chp
= strchr (target_name
, '-');
786 && chp
- 2 >= target_name
787 && strncmp (chp
- 2, "el", 2) == 0)
788 info
.byte_order
= BFD_ENDIAN_LITTLE
;
790 if (info
.byte_order
== 0)
792 /* Wire it to big-endian!!! */
793 info
.byte_order
= BIG_ENDIAN
;
798 if (! gdbarch_update_p (info
))
800 internal_error (__FILE__
, __LINE__
,
801 "initialize_current_architecture: Selection of initial architecture failed");
805 initialize_non_multiarch ();
807 /* Create the ``set architecture'' command appending ``auto'' to the
808 list of architectures. */
810 struct cmd_list_element
*c
;
811 /* Append ``auto''. */
813 for (nr
= 0; arches
[nr
] != NULL
; nr
++);
814 arches
= xrealloc (arches
, sizeof (char*) * (nr
+ 2));
815 arches
[nr
+ 0] = "auto";
816 arches
[nr
+ 1] = NULL
;
817 /* FIXME: add_set_enum_cmd() uses an array of ``char *'' instead
818 of ``const char *''. We just happen to know that the casts are
820 c
= add_set_enum_cmd ("architecture", class_support
,
821 arches
, &set_architecture_string
,
822 "Set architecture of target.",
824 c
->function
.sfunc
= set_architecture
;
825 add_alias_cmd ("processor", "architecture", class_support
, 1, &setlist
);
826 /* Don't use set_from_show - need to print both auto/manual and
828 add_cmd ("architecture", class_support
, show_architecture
,
829 "Show the current target architecture", &showlist
);
836 extern initialize_file_ftype _initialize_gdbarch_utils
;
839 _initialize_gdbarch_utils (void)
841 struct cmd_list_element
*c
;
842 c
= add_set_enum_cmd ("endian", class_support
,
843 endian_enum
, &set_endian_string
,
844 "Set endianness of target.",
846 c
->function
.sfunc
= set_endian
;
847 /* Don't use set_from_show - need to print both auto/manual and
849 add_cmd ("endian", class_support
, show_endian
,
850 "Show the current byte-order", &showlist
);