1 /* Dynamic architecture support for GDB, the GNU debugger.
3 Copyright 1998, 1999, 2000, 2001, 2002, 2003, 2004 Free Software
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. */
25 #include "arch-utils.h"
28 #include "inferior.h" /* enum CALL_DUMMY_LOCATION et.al. */
29 #include "gdb_string.h"
31 #include "gdb_assert.h"
32 #include "sim-regno.h"
38 #include "floatformat.h"
40 /* Implementation of extract return value that grubs around in the
43 legacy_extract_return_value (struct type
*type
, struct regcache
*regcache
,
46 char *registers
= deprecated_grub_regcache_for_registers (regcache
);
47 bfd_byte
*buf
= valbuf
;
48 DEPRECATED_EXTRACT_RETURN_VALUE (type
, registers
, buf
); /* OK */
51 /* Implementation of store return value that grubs the register cache.
52 Takes a local copy of the buffer to avoid const problems. */
54 legacy_store_return_value (struct type
*type
, struct regcache
*regcache
,
57 bfd_byte
*b
= alloca (TYPE_LENGTH (type
));
58 gdb_assert (regcache
== current_regcache
);
59 memcpy (b
, buf
, TYPE_LENGTH (type
));
60 DEPRECATED_STORE_RETURN_VALUE (type
, b
);
64 always_use_struct_convention (int gcc_p
, struct type
*value_type
)
69 enum return_value_convention
70 legacy_return_value (struct gdbarch
*gdbarch
, struct type
*valtype
,
71 struct regcache
*regcache
, void *readbuf
,
74 /* NOTE: cagney/2004-06-13: The gcc_p parameter to
75 USE_STRUCT_CONVENTION isn't used. */
76 int struct_return
= ((TYPE_CODE (valtype
) == TYPE_CODE_STRUCT
77 || TYPE_CODE (valtype
) == TYPE_CODE_UNION
78 || TYPE_CODE (valtype
) == TYPE_CODE_ARRAY
)
79 && DEPRECATED_USE_STRUCT_CONVENTION (0, valtype
));
83 gdb_assert (!struct_return
);
84 /* NOTE: cagney/2004-06-13: See stack.c:return_command. Old
85 architectures don't expect STORE_RETURN_VALUE to handle small
86 structures. Should not be called with such types. */
87 gdb_assert (TYPE_CODE (valtype
) != TYPE_CODE_STRUCT
88 && TYPE_CODE (valtype
) != TYPE_CODE_UNION
);
89 STORE_RETURN_VALUE (valtype
, regcache
, writebuf
);
94 gdb_assert (!struct_return
);
95 EXTRACT_RETURN_VALUE (valtype
, regcache
, readbuf
);
99 return RETURN_VALUE_STRUCT_CONVENTION
;
101 return RETURN_VALUE_REGISTER_CONVENTION
;
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_skip_trampoline_code (CORE_ADDR pc
)
127 generic_skip_solib_resolver (struct gdbarch
*gdbarch
, CORE_ADDR pc
)
133 generic_in_solib_call_trampoline (CORE_ADDR pc
, char *name
)
139 generic_in_solib_return_trampoline (CORE_ADDR pc
, char *name
)
145 generic_in_function_epilogue_p (struct gdbarch
*gdbarch
, CORE_ADDR pc
)
151 generic_remote_translate_xfer_address (struct gdbarch
*gdbarch
,
152 struct regcache
*regcache
,
153 CORE_ADDR gdb_addr
, int gdb_len
,
154 CORE_ADDR
* rem_addr
, int *rem_len
)
156 *rem_addr
= gdb_addr
;
160 /* Helper functions for INNER_THAN */
163 core_addr_lessthan (CORE_ADDR lhs
, CORE_ADDR rhs
)
169 core_addr_greaterthan (CORE_ADDR lhs
, CORE_ADDR rhs
)
175 /* Helper functions for TARGET_{FLOAT,DOUBLE}_FORMAT */
177 const struct floatformat
*
178 default_float_format (struct gdbarch
*gdbarch
)
180 int byte_order
= gdbarch_byte_order (gdbarch
);
184 return &floatformat_ieee_single_big
;
185 case BFD_ENDIAN_LITTLE
:
186 return &floatformat_ieee_single_little
;
188 internal_error (__FILE__
, __LINE__
,
189 "default_float_format: bad byte order");
194 const struct floatformat
*
195 default_double_format (struct gdbarch
*gdbarch
)
197 int byte_order
= gdbarch_byte_order (gdbarch
);
201 return &floatformat_ieee_double_big
;
202 case BFD_ENDIAN_LITTLE
:
203 return &floatformat_ieee_double_little
;
205 internal_error (__FILE__
, __LINE__
,
206 "default_double_format: bad byte order");
210 /* Misc helper functions for targets. */
213 core_addr_identity (CORE_ADDR addr
)
219 convert_from_func_ptr_addr_identity (struct gdbarch
*gdbarch
, CORE_ADDR addr
,
220 struct target_ops
*targ
)
226 no_op_reg_to_regnum (int reg
)
232 default_elf_make_msymbol_special (asymbol
*sym
, struct minimal_symbol
*msym
)
238 default_coff_make_msymbol_special (int val
, struct minimal_symbol
*msym
)
244 cannot_register_not (int regnum
)
249 /* Legacy version of target_virtual_frame_pointer(). Assumes that
250 there is an DEPRECATED_FP_REGNUM and that it is the same, cooked or
254 legacy_virtual_frame_pointer (CORE_ADDR pc
,
256 LONGEST
*frame_offset
)
258 /* FIXME: cagney/2002-09-13: This code is used when identifying the
259 frame pointer of the current PC. It is assuming that a single
260 register and an offset can determine this. I think it should
261 instead generate a byte code expression as that would work better
262 with things like Dwarf2's CFI. */
263 if (DEPRECATED_FP_REGNUM
>= 0 && DEPRECATED_FP_REGNUM
< NUM_REGS
)
264 *frame_regnum
= DEPRECATED_FP_REGNUM
;
265 else if (SP_REGNUM
>= 0 && SP_REGNUM
< NUM_REGS
)
266 *frame_regnum
= SP_REGNUM
;
268 /* Should this be an internal error? I guess so, it is reflecting
269 an architectural limitation in the current design. */
270 internal_error (__FILE__
, __LINE__
, "No virtual frame pointer available");
274 /* Assume the world is sane, every register's virtual and real size
278 generic_register_size (int regnum
)
280 gdb_assert (regnum
>= 0 && regnum
< NUM_REGS
+ NUM_PSEUDO_REGS
);
281 return TYPE_LENGTH (gdbarch_register_type (current_gdbarch
, regnum
));
284 /* Assume all registers are adjacent. */
287 generic_register_byte (int regnum
)
291 gdb_assert (regnum
>= 0 && regnum
< NUM_REGS
+ NUM_PSEUDO_REGS
);
293 for (i
= 0; i
< regnum
; i
++)
295 byte
+= generic_register_size (i
);
302 legacy_pc_in_sigtramp (CORE_ADDR pc
, char *name
)
304 #if defined (DEPRECATED_IN_SIGTRAMP)
305 return DEPRECATED_IN_SIGTRAMP (pc
, name
);
307 return name
&& strcmp ("_sigtramp", name
) == 0;
312 generic_convert_register_p (int regnum
, struct type
*type
)
318 default_stabs_argument_has_addr (struct gdbarch
*gdbarch
, struct type
*type
)
320 if (DEPRECATED_REG_STRUCT_HAS_ADDR_P ()
321 && DEPRECATED_REG_STRUCT_HAS_ADDR (processing_gcc_compilation
, type
))
323 CHECK_TYPEDEF (type
);
325 return (TYPE_CODE (type
) == TYPE_CODE_STRUCT
326 || TYPE_CODE (type
) == TYPE_CODE_UNION
327 || TYPE_CODE (type
) == TYPE_CODE_SET
328 || TYPE_CODE (type
) == TYPE_CODE_BITSTRING
);
335 /* Functions to manipulate the endianness of the target. */
337 /* ``target_byte_order'' is only used when non- multi-arch.
338 Multi-arch targets obtain the current byte order using the
339 TARGET_BYTE_ORDER gdbarch method.
341 The choice of initial value is entirely arbitrary. During startup,
342 the function initialize_current_architecture() updates this value
343 based on default byte-order information extracted from BFD. */
344 static int target_byte_order
= BFD_ENDIAN_BIG
;
345 static int target_byte_order_auto
= 1;
348 selected_byte_order (void)
350 if (target_byte_order_auto
)
351 return BFD_ENDIAN_UNKNOWN
;
353 return target_byte_order
;
356 static const char endian_big
[] = "big";
357 static const char endian_little
[] = "little";
358 static const char endian_auto
[] = "auto";
359 static const char *endian_enum
[] =
366 static const char *set_endian_string
;
368 /* Called by ``show endian''. */
371 show_endian (char *args
, int from_tty
)
373 if (target_byte_order_auto
)
374 printf_unfiltered ("The target endianness is set automatically (currently %s endian)\n",
375 (TARGET_BYTE_ORDER
== BFD_ENDIAN_BIG
? "big" : "little"));
377 printf_unfiltered ("The target is assumed to be %s endian\n",
378 (TARGET_BYTE_ORDER
== BFD_ENDIAN_BIG
? "big" : "little"));
382 set_endian (char *ignore_args
, int from_tty
, struct cmd_list_element
*c
)
384 if (set_endian_string
== endian_auto
)
386 target_byte_order_auto
= 1;
388 else if (set_endian_string
== endian_little
)
390 struct gdbarch_info info
;
391 target_byte_order_auto
= 0;
392 gdbarch_info_init (&info
);
393 info
.byte_order
= BFD_ENDIAN_LITTLE
;
394 if (! gdbarch_update_p (info
))
395 printf_unfiltered ("Little endian target not supported by GDB\n");
397 else if (set_endian_string
== endian_big
)
399 struct gdbarch_info info
;
400 target_byte_order_auto
= 0;
401 gdbarch_info_init (&info
);
402 info
.byte_order
= BFD_ENDIAN_BIG
;
403 if (! gdbarch_update_p (info
))
404 printf_unfiltered ("Big endian target not supported by GDB\n");
407 internal_error (__FILE__
, __LINE__
,
408 "set_endian: bad value");
409 show_endian (NULL
, from_tty
);
412 /* Functions to manipulate the architecture of the target */
414 enum set_arch
{ set_arch_auto
, set_arch_manual
};
416 static int target_architecture_auto
= 1;
418 static const char *set_architecture_string
;
421 selected_architecture_name (void)
423 if (target_architecture_auto
)
426 return set_architecture_string
;
429 /* Called if the user enters ``show architecture'' without an
433 show_architecture (char *args
, int from_tty
)
436 arch
= TARGET_ARCHITECTURE
->printable_name
;
437 if (target_architecture_auto
)
438 printf_filtered ("The target architecture is set automatically (currently %s)\n", arch
);
440 printf_filtered ("The target architecture is assumed to be %s\n", arch
);
444 /* Called if the user enters ``set architecture'' with or without an
448 set_architecture (char *ignore_args
, int from_tty
, struct cmd_list_element
*c
)
450 if (strcmp (set_architecture_string
, "auto") == 0)
452 target_architecture_auto
= 1;
456 struct gdbarch_info info
;
457 gdbarch_info_init (&info
);
458 info
.bfd_arch_info
= bfd_scan_arch (set_architecture_string
);
459 if (info
.bfd_arch_info
== NULL
)
460 internal_error (__FILE__
, __LINE__
,
461 "set_architecture: bfd_scan_arch failed");
462 if (gdbarch_update_p (info
))
463 target_architecture_auto
= 0;
465 printf_unfiltered ("Architecture `%s' not recognized.\n",
466 set_architecture_string
);
468 show_architecture (NULL
, from_tty
);
471 /* Try to select a global architecture that matches "info". Return
472 non-zero if the attempt succeds. */
474 gdbarch_update_p (struct gdbarch_info info
)
476 struct gdbarch
*new_gdbarch
= gdbarch_find_by_info (info
);
478 /* If there no architecture by that name, reject the request. */
479 if (new_gdbarch
== NULL
)
482 fprintf_unfiltered (gdb_stdlog
, "gdbarch_update_p: "
483 "Architecture not found\n");
487 /* If it is the same old architecture, accept the request (but don't
489 if (new_gdbarch
== current_gdbarch
)
492 fprintf_unfiltered (gdb_stdlog
, "gdbarch_update_p: "
493 "Architecture 0x%08lx (%s) unchanged\n",
495 gdbarch_bfd_arch_info (new_gdbarch
)->printable_name
);
499 /* It's a new architecture, swap it in. */
501 fprintf_unfiltered (gdb_stdlog
, "gdbarch_update_p: "
502 "New architecture 0x%08lx (%s) selected\n",
504 gdbarch_bfd_arch_info (new_gdbarch
)->printable_name
);
505 deprecated_current_gdbarch_select_hack (new_gdbarch
);
510 /* Return the architecture for ABFD. If no suitable architecture
511 could be find, return NULL. */
514 gdbarch_from_bfd (bfd
*abfd
)
516 struct gdbarch
*old_gdbarch
= current_gdbarch
;
517 struct gdbarch
*new_gdbarch
;
518 struct gdbarch_info info
;
520 gdbarch_info_init (&info
);
522 return gdbarch_find_by_info (info
);
525 /* Set the dynamic target-system-dependent parameters (architecture,
526 byte-order) using information found in the BFD */
529 set_gdbarch_from_file (bfd
*abfd
)
531 struct gdbarch
*gdbarch
;
533 gdbarch
= gdbarch_from_bfd (abfd
);
535 error ("Architecture of file not recognized.\n");
536 deprecated_current_gdbarch_select_hack (gdbarch
);
539 /* Initialize the current architecture. Update the ``set
540 architecture'' command so that it specifies a list of valid
543 #ifdef DEFAULT_BFD_ARCH
544 extern const bfd_arch_info_type DEFAULT_BFD_ARCH
;
545 static const bfd_arch_info_type
*default_bfd_arch
= &DEFAULT_BFD_ARCH
;
547 static const bfd_arch_info_type
*default_bfd_arch
;
550 #ifdef DEFAULT_BFD_VEC
551 extern const bfd_target DEFAULT_BFD_VEC
;
552 static const bfd_target
*default_bfd_vec
= &DEFAULT_BFD_VEC
;
554 static const bfd_target
*default_bfd_vec
;
558 initialize_current_architecture (void)
560 const char **arches
= gdbarch_printable_names ();
562 /* determine a default architecture and byte order. */
563 struct gdbarch_info info
;
564 gdbarch_info_init (&info
);
566 /* Find a default architecture. */
567 if (info
.bfd_arch_info
== NULL
568 && default_bfd_arch
!= NULL
)
569 info
.bfd_arch_info
= default_bfd_arch
;
570 if (info
.bfd_arch_info
== NULL
)
572 /* Choose the architecture by taking the first one
574 const char *chosen
= arches
[0];
576 for (arch
= arches
; *arch
!= NULL
; arch
++)
578 if (strcmp (*arch
, chosen
) < 0)
582 internal_error (__FILE__
, __LINE__
,
583 "initialize_current_architecture: No arch");
584 info
.bfd_arch_info
= bfd_scan_arch (chosen
);
585 if (info
.bfd_arch_info
== NULL
)
586 internal_error (__FILE__
, __LINE__
,
587 "initialize_current_architecture: Arch not found");
590 /* Take several guesses at a byte order. */
591 if (info
.byte_order
== BFD_ENDIAN_UNKNOWN
592 && default_bfd_vec
!= NULL
)
594 /* Extract BFD's default vector's byte order. */
595 switch (default_bfd_vec
->byteorder
)
598 info
.byte_order
= BFD_ENDIAN_BIG
;
600 case BFD_ENDIAN_LITTLE
:
601 info
.byte_order
= BFD_ENDIAN_LITTLE
;
607 if (info
.byte_order
== BFD_ENDIAN_UNKNOWN
)
609 /* look for ``*el-*'' in the target name. */
611 chp
= strchr (target_name
, '-');
613 && chp
- 2 >= target_name
614 && strncmp (chp
- 2, "el", 2) == 0)
615 info
.byte_order
= BFD_ENDIAN_LITTLE
;
617 if (info
.byte_order
== BFD_ENDIAN_UNKNOWN
)
619 /* Wire it to big-endian!!! */
620 info
.byte_order
= BFD_ENDIAN_BIG
;
623 if (! gdbarch_update_p (info
))
624 internal_error (__FILE__
, __LINE__
,
625 "initialize_current_architecture: Selection of initial architecture failed");
627 /* Create the ``set architecture'' command appending ``auto'' to the
628 list of architectures. */
630 struct cmd_list_element
*c
;
631 /* Append ``auto''. */
633 for (nr
= 0; arches
[nr
] != NULL
; nr
++);
634 arches
= xrealloc (arches
, sizeof (char*) * (nr
+ 2));
635 arches
[nr
+ 0] = "auto";
636 arches
[nr
+ 1] = NULL
;
637 /* FIXME: add_set_enum_cmd() uses an array of ``char *'' instead
638 of ``const char *''. We just happen to know that the casts are
640 c
= add_set_enum_cmd ("architecture", class_support
,
641 arches
, &set_architecture_string
,
642 "Set architecture of target.",
644 set_cmd_sfunc (c
, set_architecture
);
645 add_alias_cmd ("processor", "architecture", class_support
, 1, &setlist
);
646 /* Don't use set_from_show - need to print both auto/manual and
648 add_cmd ("architecture", class_support
, show_architecture
,
649 "Show the current target architecture", &showlist
);
654 /* Initialize a gdbarch info to values that will be automatically
655 overridden. Note: Originally, this ``struct info'' was initialized
656 using memset(0). Unfortunately, that ran into problems, namely
657 BFD_ENDIAN_BIG is zero. An explicit initialization function that
658 can explicitly set each field to a well defined value is used. */
661 gdbarch_info_init (struct gdbarch_info
*info
)
663 memset (info
, 0, sizeof (struct gdbarch_info
));
664 info
->byte_order
= BFD_ENDIAN_UNKNOWN
;
665 info
->osabi
= GDB_OSABI_UNINITIALIZED
;
668 /* Similar to init, but this time fill in the blanks. Information is
669 obtained from the specified architecture, global "set ..." options,
670 and explicitly initialized INFO fields. */
673 gdbarch_info_fill (struct gdbarch
*gdbarch
, struct gdbarch_info
*info
)
675 /* "(gdb) set architecture ...". */
676 if (info
->bfd_arch_info
== NULL
677 && !target_architecture_auto
679 info
->bfd_arch_info
= gdbarch_bfd_arch_info (gdbarch
);
680 if (info
->bfd_arch_info
== NULL
681 && info
->abfd
!= NULL
682 && bfd_get_arch (info
->abfd
) != bfd_arch_unknown
683 && bfd_get_arch (info
->abfd
) != bfd_arch_obscure
)
684 info
->bfd_arch_info
= bfd_get_arch_info (info
->abfd
);
685 if (info
->bfd_arch_info
== NULL
687 info
->bfd_arch_info
= gdbarch_bfd_arch_info (gdbarch
);
689 /* "(gdb) set byte-order ...". */
690 if (info
->byte_order
== BFD_ENDIAN_UNKNOWN
691 && !target_byte_order_auto
693 info
->byte_order
= gdbarch_byte_order (gdbarch
);
694 /* From the INFO struct. */
695 if (info
->byte_order
== BFD_ENDIAN_UNKNOWN
696 && info
->abfd
!= NULL
)
697 info
->byte_order
= (bfd_big_endian (info
->abfd
) ? BFD_ENDIAN_BIG
698 : bfd_little_endian (info
->abfd
) ? BFD_ENDIAN_LITTLE
699 : BFD_ENDIAN_UNKNOWN
);
700 /* From the current target. */
701 if (info
->byte_order
== BFD_ENDIAN_UNKNOWN
703 info
->byte_order
= gdbarch_byte_order (gdbarch
);
705 /* "(gdb) set osabi ...". Handled by gdbarch_lookup_osabi. */
706 if (info
->osabi
== GDB_OSABI_UNINITIALIZED
)
707 info
->osabi
= gdbarch_lookup_osabi (info
->abfd
);
708 if (info
->osabi
== GDB_OSABI_UNINITIALIZED
710 info
->osabi
= gdbarch_osabi (gdbarch
);
712 /* Must have at least filled in the architecture. */
713 gdb_assert (info
->bfd_arch_info
!= NULL
);
718 extern initialize_file_ftype _initialize_gdbarch_utils
; /* -Wmissing-prototypes */
721 _initialize_gdbarch_utils (void)
723 struct cmd_list_element
*c
;
724 c
= add_set_enum_cmd ("endian", class_support
,
725 endian_enum
, &set_endian_string
,
726 "Set endianness of target.",
728 set_cmd_sfunc (c
, set_endian
);
729 /* Don't use set_from_show - need to print both auto/manual and
731 add_cmd ("endian", class_support
, show_endian
,
732 "Show the current byte-order", &showlist
);