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_return_trampoline (CORE_ADDR pc
, char *name
)
139 generic_in_function_epilogue_p (struct gdbarch
*gdbarch
, CORE_ADDR pc
)
145 generic_remote_translate_xfer_address (struct gdbarch
*gdbarch
,
146 struct regcache
*regcache
,
147 CORE_ADDR gdb_addr
, int gdb_len
,
148 CORE_ADDR
* rem_addr
, int *rem_len
)
150 *rem_addr
= gdb_addr
;
154 /* Helper functions for INNER_THAN */
157 core_addr_lessthan (CORE_ADDR lhs
, CORE_ADDR rhs
)
163 core_addr_greaterthan (CORE_ADDR lhs
, CORE_ADDR rhs
)
169 /* Helper functions for TARGET_{FLOAT,DOUBLE}_FORMAT */
171 const struct floatformat
*
172 default_float_format (struct gdbarch
*gdbarch
)
174 int byte_order
= gdbarch_byte_order (gdbarch
);
178 return &floatformat_ieee_single_big
;
179 case BFD_ENDIAN_LITTLE
:
180 return &floatformat_ieee_single_little
;
182 internal_error (__FILE__
, __LINE__
,
183 "default_float_format: bad byte order");
188 const struct floatformat
*
189 default_double_format (struct gdbarch
*gdbarch
)
191 int byte_order
= gdbarch_byte_order (gdbarch
);
195 return &floatformat_ieee_double_big
;
196 case BFD_ENDIAN_LITTLE
:
197 return &floatformat_ieee_double_little
;
199 internal_error (__FILE__
, __LINE__
,
200 "default_double_format: bad byte order");
204 /* Misc helper functions for targets. */
207 core_addr_identity (CORE_ADDR addr
)
213 convert_from_func_ptr_addr_identity (struct gdbarch
*gdbarch
, CORE_ADDR addr
,
214 struct target_ops
*targ
)
220 no_op_reg_to_regnum (int reg
)
226 default_elf_make_msymbol_special (asymbol
*sym
, struct minimal_symbol
*msym
)
232 default_coff_make_msymbol_special (int val
, struct minimal_symbol
*msym
)
238 cannot_register_not (int regnum
)
243 /* Legacy version of target_virtual_frame_pointer(). Assumes that
244 there is an DEPRECATED_FP_REGNUM and that it is the same, cooked or
248 legacy_virtual_frame_pointer (CORE_ADDR pc
,
250 LONGEST
*frame_offset
)
252 /* FIXME: cagney/2002-09-13: This code is used when identifying the
253 frame pointer of the current PC. It is assuming that a single
254 register and an offset can determine this. I think it should
255 instead generate a byte code expression as that would work better
256 with things like Dwarf2's CFI. */
257 if (DEPRECATED_FP_REGNUM
>= 0 && DEPRECATED_FP_REGNUM
< NUM_REGS
)
258 *frame_regnum
= DEPRECATED_FP_REGNUM
;
259 else if (SP_REGNUM
>= 0 && SP_REGNUM
< NUM_REGS
)
260 *frame_regnum
= SP_REGNUM
;
262 /* Should this be an internal error? I guess so, it is reflecting
263 an architectural limitation in the current design. */
264 internal_error (__FILE__
, __LINE__
, "No virtual frame pointer available");
268 /* Assume the world is sane, every register's virtual and real size
272 generic_register_size (int regnum
)
274 gdb_assert (regnum
>= 0 && regnum
< NUM_REGS
+ NUM_PSEUDO_REGS
);
275 return TYPE_LENGTH (gdbarch_register_type (current_gdbarch
, regnum
));
278 /* Assume all registers are adjacent. */
281 generic_register_byte (int regnum
)
285 gdb_assert (regnum
>= 0 && regnum
< NUM_REGS
+ NUM_PSEUDO_REGS
);
287 for (i
= 0; i
< regnum
; i
++)
289 byte
+= generic_register_size (i
);
296 legacy_pc_in_sigtramp (CORE_ADDR pc
, char *name
)
298 #if defined (DEPRECATED_IN_SIGTRAMP)
299 return DEPRECATED_IN_SIGTRAMP (pc
, name
);
301 return name
&& strcmp ("_sigtramp", name
) == 0;
306 generic_convert_register_p (int regnum
, struct type
*type
)
312 default_stabs_argument_has_addr (struct gdbarch
*gdbarch
, struct type
*type
)
314 if (DEPRECATED_REG_STRUCT_HAS_ADDR_P ()
315 && DEPRECATED_REG_STRUCT_HAS_ADDR (processing_gcc_compilation
, type
))
317 CHECK_TYPEDEF (type
);
319 return (TYPE_CODE (type
) == TYPE_CODE_STRUCT
320 || TYPE_CODE (type
) == TYPE_CODE_UNION
321 || TYPE_CODE (type
) == TYPE_CODE_SET
322 || TYPE_CODE (type
) == TYPE_CODE_BITSTRING
);
329 /* Functions to manipulate the endianness of the target. */
331 /* ``target_byte_order'' is only used when non- multi-arch.
332 Multi-arch targets obtain the current byte order using the
333 TARGET_BYTE_ORDER gdbarch method.
335 The choice of initial value is entirely arbitrary. During startup,
336 the function initialize_current_architecture() updates this value
337 based on default byte-order information extracted from BFD. */
338 static int target_byte_order
= BFD_ENDIAN_BIG
;
339 static int target_byte_order_auto
= 1;
342 selected_byte_order (void)
344 if (target_byte_order_auto
)
345 return BFD_ENDIAN_UNKNOWN
;
347 return target_byte_order
;
350 static const char endian_big
[] = "big";
351 static const char endian_little
[] = "little";
352 static const char endian_auto
[] = "auto";
353 static const char *endian_enum
[] =
360 static const char *set_endian_string
;
362 /* Called by ``show endian''. */
365 show_endian (char *args
, int from_tty
)
367 if (target_byte_order_auto
)
368 printf_unfiltered ("The target endianness is set automatically (currently %s endian)\n",
369 (TARGET_BYTE_ORDER
== BFD_ENDIAN_BIG
? "big" : "little"));
371 printf_unfiltered ("The target is assumed to be %s endian\n",
372 (TARGET_BYTE_ORDER
== BFD_ENDIAN_BIG
? "big" : "little"));
376 set_endian (char *ignore_args
, int from_tty
, struct cmd_list_element
*c
)
378 if (set_endian_string
== endian_auto
)
380 target_byte_order_auto
= 1;
382 else if (set_endian_string
== endian_little
)
384 struct gdbarch_info info
;
385 target_byte_order_auto
= 0;
386 gdbarch_info_init (&info
);
387 info
.byte_order
= BFD_ENDIAN_LITTLE
;
388 if (! gdbarch_update_p (info
))
389 printf_unfiltered ("Little endian target not supported by GDB\n");
391 else if (set_endian_string
== endian_big
)
393 struct gdbarch_info info
;
394 target_byte_order_auto
= 0;
395 gdbarch_info_init (&info
);
396 info
.byte_order
= BFD_ENDIAN_BIG
;
397 if (! gdbarch_update_p (info
))
398 printf_unfiltered ("Big endian target not supported by GDB\n");
401 internal_error (__FILE__
, __LINE__
,
402 "set_endian: bad value");
403 show_endian (NULL
, from_tty
);
406 /* Functions to manipulate the architecture of the target */
408 enum set_arch
{ set_arch_auto
, set_arch_manual
};
410 static int target_architecture_auto
= 1;
412 static const char *set_architecture_string
;
415 selected_architecture_name (void)
417 if (target_architecture_auto
)
420 return set_architecture_string
;
423 /* Called if the user enters ``show architecture'' without an
427 show_architecture (char *args
, int from_tty
)
430 arch
= TARGET_ARCHITECTURE
->printable_name
;
431 if (target_architecture_auto
)
432 printf_filtered ("The target architecture is set automatically (currently %s)\n", arch
);
434 printf_filtered ("The target architecture is assumed to be %s\n", arch
);
438 /* Called if the user enters ``set architecture'' with or without an
442 set_architecture (char *ignore_args
, int from_tty
, struct cmd_list_element
*c
)
444 if (strcmp (set_architecture_string
, "auto") == 0)
446 target_architecture_auto
= 1;
450 struct gdbarch_info info
;
451 gdbarch_info_init (&info
);
452 info
.bfd_arch_info
= bfd_scan_arch (set_architecture_string
);
453 if (info
.bfd_arch_info
== NULL
)
454 internal_error (__FILE__
, __LINE__
,
455 "set_architecture: bfd_scan_arch failed");
456 if (gdbarch_update_p (info
))
457 target_architecture_auto
= 0;
459 printf_unfiltered ("Architecture `%s' not recognized.\n",
460 set_architecture_string
);
462 show_architecture (NULL
, from_tty
);
465 /* Try to select a global architecture that matches "info". Return
466 non-zero if the attempt succeds. */
468 gdbarch_update_p (struct gdbarch_info info
)
470 struct gdbarch
*new_gdbarch
= gdbarch_find_by_info (info
);
472 /* If there no architecture by that name, reject the request. */
473 if (new_gdbarch
== NULL
)
476 fprintf_unfiltered (gdb_stdlog
, "gdbarch_update_p: "
477 "Architecture not found\n");
481 /* If it is the same old architecture, accept the request (but don't
483 if (new_gdbarch
== current_gdbarch
)
486 fprintf_unfiltered (gdb_stdlog
, "gdbarch_update_p: "
487 "Architecture 0x%08lx (%s) unchanged\n",
489 gdbarch_bfd_arch_info (new_gdbarch
)->printable_name
);
493 /* It's a new architecture, swap it in. */
495 fprintf_unfiltered (gdb_stdlog
, "gdbarch_update_p: "
496 "New architecture 0x%08lx (%s) selected\n",
498 gdbarch_bfd_arch_info (new_gdbarch
)->printable_name
);
499 deprecated_current_gdbarch_select_hack (new_gdbarch
);
504 /* Return the architecture for ABFD. If no suitable architecture
505 could be find, return NULL. */
508 gdbarch_from_bfd (bfd
*abfd
)
510 struct gdbarch
*old_gdbarch
= current_gdbarch
;
511 struct gdbarch
*new_gdbarch
;
512 struct gdbarch_info info
;
514 gdbarch_info_init (&info
);
516 return gdbarch_find_by_info (info
);
519 /* Set the dynamic target-system-dependent parameters (architecture,
520 byte-order) using information found in the BFD */
523 set_gdbarch_from_file (bfd
*abfd
)
525 struct gdbarch
*gdbarch
;
527 gdbarch
= gdbarch_from_bfd (abfd
);
529 error ("Architecture of file not recognized.\n");
530 deprecated_current_gdbarch_select_hack (gdbarch
);
533 /* Initialize the current architecture. Update the ``set
534 architecture'' command so that it specifies a list of valid
537 #ifdef DEFAULT_BFD_ARCH
538 extern const bfd_arch_info_type DEFAULT_BFD_ARCH
;
539 static const bfd_arch_info_type
*default_bfd_arch
= &DEFAULT_BFD_ARCH
;
541 static const bfd_arch_info_type
*default_bfd_arch
;
544 #ifdef DEFAULT_BFD_VEC
545 extern const bfd_target DEFAULT_BFD_VEC
;
546 static const bfd_target
*default_bfd_vec
= &DEFAULT_BFD_VEC
;
548 static const bfd_target
*default_bfd_vec
;
552 initialize_current_architecture (void)
554 const char **arches
= gdbarch_printable_names ();
556 /* determine a default architecture and byte order. */
557 struct gdbarch_info info
;
558 gdbarch_info_init (&info
);
560 /* Find a default architecture. */
561 if (info
.bfd_arch_info
== NULL
562 && default_bfd_arch
!= NULL
)
563 info
.bfd_arch_info
= default_bfd_arch
;
564 if (info
.bfd_arch_info
== NULL
)
566 /* Choose the architecture by taking the first one
568 const char *chosen
= arches
[0];
570 for (arch
= arches
; *arch
!= NULL
; arch
++)
572 if (strcmp (*arch
, chosen
) < 0)
576 internal_error (__FILE__
, __LINE__
,
577 "initialize_current_architecture: No arch");
578 info
.bfd_arch_info
= bfd_scan_arch (chosen
);
579 if (info
.bfd_arch_info
== NULL
)
580 internal_error (__FILE__
, __LINE__
,
581 "initialize_current_architecture: Arch not found");
584 /* Take several guesses at a byte order. */
585 if (info
.byte_order
== BFD_ENDIAN_UNKNOWN
586 && default_bfd_vec
!= NULL
)
588 /* Extract BFD's default vector's byte order. */
589 switch (default_bfd_vec
->byteorder
)
592 info
.byte_order
= BFD_ENDIAN_BIG
;
594 case BFD_ENDIAN_LITTLE
:
595 info
.byte_order
= BFD_ENDIAN_LITTLE
;
601 if (info
.byte_order
== BFD_ENDIAN_UNKNOWN
)
603 /* look for ``*el-*'' in the target name. */
605 chp
= strchr (target_name
, '-');
607 && chp
- 2 >= target_name
608 && strncmp (chp
- 2, "el", 2) == 0)
609 info
.byte_order
= BFD_ENDIAN_LITTLE
;
611 if (info
.byte_order
== BFD_ENDIAN_UNKNOWN
)
613 /* Wire it to big-endian!!! */
614 info
.byte_order
= BFD_ENDIAN_BIG
;
617 if (! gdbarch_update_p (info
))
618 internal_error (__FILE__
, __LINE__
,
619 "initialize_current_architecture: Selection of initial architecture failed");
621 /* Create the ``set architecture'' command appending ``auto'' to the
622 list of architectures. */
624 struct cmd_list_element
*c
;
625 /* Append ``auto''. */
627 for (nr
= 0; arches
[nr
] != NULL
; nr
++);
628 arches
= xrealloc (arches
, sizeof (char*) * (nr
+ 2));
629 arches
[nr
+ 0] = "auto";
630 arches
[nr
+ 1] = NULL
;
631 /* FIXME: add_set_enum_cmd() uses an array of ``char *'' instead
632 of ``const char *''. We just happen to know that the casts are
634 c
= add_set_enum_cmd ("architecture", class_support
,
635 arches
, &set_architecture_string
,
636 "Set architecture of target.",
638 set_cmd_sfunc (c
, set_architecture
);
639 add_alias_cmd ("processor", "architecture", class_support
, 1, &setlist
);
640 /* Don't use set_from_show - need to print both auto/manual and
642 add_cmd ("architecture", class_support
, show_architecture
,
643 "Show the current target architecture", &showlist
);
648 /* Initialize a gdbarch info to values that will be automatically
649 overridden. Note: Originally, this ``struct info'' was initialized
650 using memset(0). Unfortunately, that ran into problems, namely
651 BFD_ENDIAN_BIG is zero. An explicit initialization function that
652 can explicitly set each field to a well defined value is used. */
655 gdbarch_info_init (struct gdbarch_info
*info
)
657 memset (info
, 0, sizeof (struct gdbarch_info
));
658 info
->byte_order
= BFD_ENDIAN_UNKNOWN
;
659 info
->osabi
= GDB_OSABI_UNINITIALIZED
;
662 /* Similar to init, but this time fill in the blanks. Information is
663 obtained from the specified architecture, global "set ..." options,
664 and explicitly initialized INFO fields. */
667 gdbarch_info_fill (struct gdbarch
*gdbarch
, struct gdbarch_info
*info
)
669 /* "(gdb) set architecture ...". */
670 if (info
->bfd_arch_info
== NULL
671 && !target_architecture_auto
673 info
->bfd_arch_info
= gdbarch_bfd_arch_info (gdbarch
);
674 if (info
->bfd_arch_info
== NULL
675 && info
->abfd
!= NULL
676 && bfd_get_arch (info
->abfd
) != bfd_arch_unknown
677 && bfd_get_arch (info
->abfd
) != bfd_arch_obscure
)
678 info
->bfd_arch_info
= bfd_get_arch_info (info
->abfd
);
679 if (info
->bfd_arch_info
== NULL
681 info
->bfd_arch_info
= gdbarch_bfd_arch_info (gdbarch
);
683 /* "(gdb) set byte-order ...". */
684 if (info
->byte_order
== BFD_ENDIAN_UNKNOWN
685 && !target_byte_order_auto
687 info
->byte_order
= gdbarch_byte_order (gdbarch
);
688 /* From the INFO struct. */
689 if (info
->byte_order
== BFD_ENDIAN_UNKNOWN
690 && info
->abfd
!= NULL
)
691 info
->byte_order
= (bfd_big_endian (info
->abfd
) ? BFD_ENDIAN_BIG
692 : bfd_little_endian (info
->abfd
) ? BFD_ENDIAN_LITTLE
693 : BFD_ENDIAN_UNKNOWN
);
694 /* From the current target. */
695 if (info
->byte_order
== BFD_ENDIAN_UNKNOWN
697 info
->byte_order
= gdbarch_byte_order (gdbarch
);
699 /* "(gdb) set osabi ...". Handled by gdbarch_lookup_osabi. */
700 if (info
->osabi
== GDB_OSABI_UNINITIALIZED
)
701 info
->osabi
= gdbarch_lookup_osabi (info
->abfd
);
702 if (info
->osabi
== GDB_OSABI_UNINITIALIZED
704 info
->osabi
= gdbarch_osabi (gdbarch
);
706 /* Must have at least filled in the architecture. */
707 gdb_assert (info
->bfd_arch_info
!= NULL
);
712 extern initialize_file_ftype _initialize_gdbarch_utils
; /* -Wmissing-prototypes */
715 _initialize_gdbarch_utils (void)
717 struct cmd_list_element
*c
;
718 c
= add_set_enum_cmd ("endian", class_support
,
719 endian_enum
, &set_endian_string
,
720 "Set endianness of target.",
722 set_cmd_sfunc (c
, set_endian
);
723 /* Don't use set_from_show - need to print both auto/manual and
725 add_cmd ("endian", class_support
, show_endian
,
726 "Show the current byte-order", &showlist
);