1 /* Dynamic architecture support for GDB, the GNU debugger.
3 Copyright (C) 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005
4 Free Software Foundation, Inc.
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., 51 Franklin Street, Fifth Floor,
21 Boston, MA 02110-1301, 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 gdb_byte
*registers
= deprecated_grub_regcache_for_registers (regcache
);
47 gdb_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 gdb_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
, gdb_byte
*readbuf
,
72 const gdb_byte
*writebuf
)
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 generic_instruction_nullified (struct gdbarch
*gdbarch
,
330 struct regcache
*regcache
)
336 /* Functions to manipulate the endianness of the target. */
338 static int target_byte_order_user
= BFD_ENDIAN_UNKNOWN
;
340 static const char endian_big
[] = "big";
341 static const char endian_little
[] = "little";
342 static const char endian_auto
[] = "auto";
343 static const char *endian_enum
[] =
350 static const char *set_endian_string
;
352 /* Called by ``show endian''. */
355 show_endian (struct ui_file
*file
, int from_tty
, struct cmd_list_element
*c
,
358 if (target_byte_order_user
!= BFD_ENDIAN_UNKNOWN
)
359 if (TARGET_BYTE_ORDER
== BFD_ENDIAN_BIG
)
360 fprintf_unfiltered (file
, _("The target endianness is set automatically "
361 "(currently big endian)\n"));
363 fprintf_unfiltered (file
, _("The target endianness is set automatically "
364 "(currently little endian)\n"));
366 if (TARGET_BYTE_ORDER
== BFD_ENDIAN_BIG
)
367 fprintf_unfiltered (file
,
368 _("The target is assumed to be big endian\n"));
370 fprintf_unfiltered (file
,
371 _("The target is assumed to be little endian\n"));
375 set_endian (char *ignore_args
, int from_tty
, struct cmd_list_element
*c
)
377 struct gdbarch_info info
;
379 gdbarch_info_init (&info
);
381 if (set_endian_string
== endian_auto
)
383 target_byte_order_user
= BFD_ENDIAN_UNKNOWN
;
384 if (! gdbarch_update_p (info
))
385 internal_error (__FILE__
, __LINE__
,
386 _("set_endian: architecture update failed"));
388 else if (set_endian_string
== endian_little
)
390 info
.byte_order
= BFD_ENDIAN_LITTLE
;
391 if (! gdbarch_update_p (info
))
392 printf_unfiltered (_("Little endian target not supported by GDB\n"));
394 target_byte_order_user
= BFD_ENDIAN_LITTLE
;
396 else if (set_endian_string
== endian_big
)
398 info
.byte_order
= BFD_ENDIAN_BIG
;
399 if (! gdbarch_update_p (info
))
400 printf_unfiltered (_("Big endian target not supported by GDB\n"));
402 target_byte_order_user
= BFD_ENDIAN_BIG
;
405 internal_error (__FILE__
, __LINE__
,
406 _("set_endian: bad value"));
408 show_endian (gdb_stdout
, from_tty
, NULL
, NULL
);
411 /* Functions to manipulate the architecture of the target */
413 enum set_arch
{ set_arch_auto
, set_arch_manual
};
415 static const struct bfd_arch_info
*target_architecture_user
;
417 static const char *set_architecture_string
;
420 selected_architecture_name (void)
422 if (target_architecture_user
== NULL
)
425 return set_architecture_string
;
428 /* Called if the user enters ``show architecture'' without an
432 show_architecture (struct ui_file
*file
, int from_tty
,
433 struct cmd_list_element
*c
, const char *value
)
436 arch
= TARGET_ARCHITECTURE
->printable_name
;
437 if (target_architecture_user
== NULL
)
438 fprintf_filtered (file
, _("\
439 The target architecture is set automatically (currently %s)\n"), arch
);
441 fprintf_filtered (file
, _("\
442 The target architecture is assumed to be %s\n"), arch
);
446 /* Called if the user enters ``set architecture'' with or without an
450 set_architecture (char *ignore_args
, int from_tty
, struct cmd_list_element
*c
)
452 struct gdbarch_info info
;
454 gdbarch_info_init (&info
);
456 if (strcmp (set_architecture_string
, "auto") == 0)
458 target_architecture_user
= NULL
;
459 if (!gdbarch_update_p (info
))
460 internal_error (__FILE__
, __LINE__
,
461 _("could not select an architecture automatically"));
465 info
.bfd_arch_info
= bfd_scan_arch (set_architecture_string
);
466 if (info
.bfd_arch_info
== NULL
)
467 internal_error (__FILE__
, __LINE__
,
468 _("set_architecture: bfd_scan_arch failed"));
469 if (gdbarch_update_p (info
))
470 target_architecture_user
= info
.bfd_arch_info
;
472 printf_unfiltered (_("Architecture `%s' not recognized.\n"),
473 set_architecture_string
);
475 show_architecture (gdb_stdout
, from_tty
, NULL
, NULL
);
478 /* Try to select a global architecture that matches "info". Return
479 non-zero if the attempt succeds. */
481 gdbarch_update_p (struct gdbarch_info info
)
483 struct gdbarch
*new_gdbarch
= gdbarch_find_by_info (info
);
485 /* If there no architecture by that name, reject the request. */
486 if (new_gdbarch
== NULL
)
489 fprintf_unfiltered (gdb_stdlog
, "gdbarch_update_p: "
490 "Architecture not found\n");
494 /* If it is the same old architecture, accept the request (but don't
496 if (new_gdbarch
== current_gdbarch
)
499 fprintf_unfiltered (gdb_stdlog
, "gdbarch_update_p: "
500 "Architecture 0x%08lx (%s) unchanged\n",
502 gdbarch_bfd_arch_info (new_gdbarch
)->printable_name
);
506 /* It's a new architecture, swap it in. */
508 fprintf_unfiltered (gdb_stdlog
, "gdbarch_update_p: "
509 "New architecture 0x%08lx (%s) selected\n",
511 gdbarch_bfd_arch_info (new_gdbarch
)->printable_name
);
512 deprecated_current_gdbarch_select_hack (new_gdbarch
);
517 /* Return the architecture for ABFD. If no suitable architecture
518 could be find, return NULL. */
521 gdbarch_from_bfd (bfd
*abfd
)
523 struct gdbarch
*old_gdbarch
= current_gdbarch
;
524 struct gdbarch
*new_gdbarch
;
525 struct gdbarch_info info
;
527 /* If we call gdbarch_find_by_info without filling in info.abfd,
528 then it will use the global exec_bfd. That's fine if we don't
529 have one of those either. And that's the only time we should
530 reach here with a NULL ABFD argument - when we are discarding
532 gdb_assert (abfd
!= NULL
|| exec_bfd
== NULL
);
534 gdbarch_info_init (&info
);
536 return gdbarch_find_by_info (info
);
539 /* Set the dynamic target-system-dependent parameters (architecture,
540 byte-order) using information found in the BFD */
543 set_gdbarch_from_file (bfd
*abfd
)
545 struct gdbarch
*gdbarch
;
547 gdbarch
= gdbarch_from_bfd (abfd
);
549 error (_("Architecture of file not recognized."));
550 deprecated_current_gdbarch_select_hack (gdbarch
);
553 /* Initialize the current architecture. Update the ``set
554 architecture'' command so that it specifies a list of valid
557 #ifdef DEFAULT_BFD_ARCH
558 extern const bfd_arch_info_type DEFAULT_BFD_ARCH
;
559 static const bfd_arch_info_type
*default_bfd_arch
= &DEFAULT_BFD_ARCH
;
561 static const bfd_arch_info_type
*default_bfd_arch
;
564 #ifdef DEFAULT_BFD_VEC
565 extern const bfd_target DEFAULT_BFD_VEC
;
566 static const bfd_target
*default_bfd_vec
= &DEFAULT_BFD_VEC
;
568 static const bfd_target
*default_bfd_vec
;
571 static int default_byte_order
= BFD_ENDIAN_UNKNOWN
;
574 initialize_current_architecture (void)
576 const char **arches
= gdbarch_printable_names ();
578 /* determine a default architecture and byte order. */
579 struct gdbarch_info info
;
580 gdbarch_info_init (&info
);
582 /* Find a default architecture. */
583 if (default_bfd_arch
== NULL
)
585 /* Choose the architecture by taking the first one
587 const char *chosen
= arches
[0];
589 for (arch
= arches
; *arch
!= NULL
; arch
++)
591 if (strcmp (*arch
, chosen
) < 0)
595 internal_error (__FILE__
, __LINE__
,
596 _("initialize_current_architecture: No arch"));
597 default_bfd_arch
= bfd_scan_arch (chosen
);
598 if (default_bfd_arch
== NULL
)
599 internal_error (__FILE__
, __LINE__
,
600 _("initialize_current_architecture: Arch not found"));
603 info
.bfd_arch_info
= default_bfd_arch
;
605 /* Take several guesses at a byte order. */
606 if (default_byte_order
== BFD_ENDIAN_UNKNOWN
607 && default_bfd_vec
!= NULL
)
609 /* Extract BFD's default vector's byte order. */
610 switch (default_bfd_vec
->byteorder
)
613 default_byte_order
= BFD_ENDIAN_BIG
;
615 case BFD_ENDIAN_LITTLE
:
616 default_byte_order
= BFD_ENDIAN_LITTLE
;
622 if (default_byte_order
== BFD_ENDIAN_UNKNOWN
)
624 /* look for ``*el-*'' in the target name. */
626 chp
= strchr (target_name
, '-');
628 && chp
- 2 >= target_name
629 && strncmp (chp
- 2, "el", 2) == 0)
630 default_byte_order
= BFD_ENDIAN_LITTLE
;
632 if (default_byte_order
== BFD_ENDIAN_UNKNOWN
)
634 /* Wire it to big-endian!!! */
635 default_byte_order
= BFD_ENDIAN_BIG
;
638 info
.byte_order
= default_byte_order
;
640 if (! gdbarch_update_p (info
))
641 internal_error (__FILE__
, __LINE__
,
642 _("initialize_current_architecture: Selection of "
643 "initial architecture failed"));
645 /* Create the ``set architecture'' command appending ``auto'' to the
646 list of architectures. */
648 struct cmd_list_element
*c
;
649 /* Append ``auto''. */
651 for (nr
= 0; arches
[nr
] != NULL
; nr
++);
652 arches
= xrealloc (arches
, sizeof (char*) * (nr
+ 2));
653 arches
[nr
+ 0] = "auto";
654 arches
[nr
+ 1] = NULL
;
655 add_setshow_enum_cmd ("architecture", class_support
,
656 arches
, &set_architecture_string
, _("\
657 Set architecture of target."), _("\
658 Show architecture of target."), NULL
,
659 set_architecture
, show_architecture
,
660 &setlist
, &showlist
);
661 add_alias_cmd ("processor", "architecture", class_support
, 1, &setlist
);
666 /* Initialize a gdbarch info to values that will be automatically
667 overridden. Note: Originally, this ``struct info'' was initialized
668 using memset(0). Unfortunately, that ran into problems, namely
669 BFD_ENDIAN_BIG is zero. An explicit initialization function that
670 can explicitly set each field to a well defined value is used. */
673 gdbarch_info_init (struct gdbarch_info
*info
)
675 memset (info
, 0, sizeof (struct gdbarch_info
));
676 info
->byte_order
= BFD_ENDIAN_UNKNOWN
;
677 info
->osabi
= GDB_OSABI_UNINITIALIZED
;
680 /* Similar to init, but this time fill in the blanks. Information is
681 obtained from the global "set ..." options and explicitly
682 initialized INFO fields. */
685 gdbarch_info_fill (struct gdbarch_info
*info
)
687 /* Check for the current file. */
688 if (info
->abfd
== NULL
)
689 info
->abfd
= exec_bfd
;
691 /* "(gdb) set architecture ...". */
692 if (info
->bfd_arch_info
== NULL
693 && target_architecture_user
)
694 info
->bfd_arch_info
= target_architecture_user
;
695 if (info
->bfd_arch_info
== NULL
696 && info
->abfd
!= NULL
697 && bfd_get_arch (info
->abfd
) != bfd_arch_unknown
698 && bfd_get_arch (info
->abfd
) != bfd_arch_obscure
)
699 info
->bfd_arch_info
= bfd_get_arch_info (info
->abfd
);
700 /* From the default. */
701 if (info
->bfd_arch_info
== NULL
)
702 info
->bfd_arch_info
= default_bfd_arch
;
704 /* "(gdb) set byte-order ...". */
705 if (info
->byte_order
== BFD_ENDIAN_UNKNOWN
706 && target_byte_order_user
!= BFD_ENDIAN_UNKNOWN
)
707 info
->byte_order
= target_byte_order_user
;
708 /* From the INFO struct. */
709 if (info
->byte_order
== BFD_ENDIAN_UNKNOWN
710 && info
->abfd
!= NULL
)
711 info
->byte_order
= (bfd_big_endian (info
->abfd
) ? BFD_ENDIAN_BIG
712 : bfd_little_endian (info
->abfd
) ? BFD_ENDIAN_LITTLE
713 : BFD_ENDIAN_UNKNOWN
);
714 /* From the default. */
715 if (info
->byte_order
== BFD_ENDIAN_UNKNOWN
)
716 info
->byte_order
= default_byte_order
;
718 /* "(gdb) set osabi ...". Handled by gdbarch_lookup_osabi. */
719 if (info
->osabi
== GDB_OSABI_UNINITIALIZED
)
720 info
->osabi
= gdbarch_lookup_osabi (info
->abfd
);
722 /* Must have at least filled in the architecture. */
723 gdb_assert (info
->bfd_arch_info
!= NULL
);
728 extern initialize_file_ftype _initialize_gdbarch_utils
; /* -Wmissing-prototypes */
731 _initialize_gdbarch_utils (void)
733 struct cmd_list_element
*c
;
734 add_setshow_enum_cmd ("endian", class_support
,
735 endian_enum
, &set_endian_string
, _("\
736 Set endianness of target."), _("\
737 Show endianness of target."), NULL
,
738 set_endian
, show_endian
,
739 &setlist
, &showlist
);