1 /* Dynamic architecture support for GDB, the GNU debugger.
3 Copyright (C) 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007
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"
35 #include "target-descriptions.h"
39 #include "floatformat.h"
41 /* Implementation of extract return value that grubs around in the
44 legacy_extract_return_value (struct type *type, struct regcache *regcache,
47 gdb_byte *registers = deprecated_grub_regcache_for_registers (regcache);
48 gdb_byte *buf = valbuf;
49 DEPRECATED_EXTRACT_RETURN_VALUE (type, registers, buf); /* OK */
52 /* Implementation of store return value that grubs the register cache.
53 Takes a local copy of the buffer to avoid const problems. */
55 legacy_store_return_value (struct type *type, struct regcache *regcache,
58 gdb_byte *b = alloca (TYPE_LENGTH (type));
59 gdb_assert (regcache == current_regcache);
60 memcpy (b, buf, TYPE_LENGTH (type));
61 DEPRECATED_STORE_RETURN_VALUE (type, b);
65 always_use_struct_convention (int gcc_p, struct type *value_type)
70 enum return_value_convention
71 legacy_return_value (struct gdbarch *gdbarch, struct type *valtype,
72 struct regcache *regcache, gdb_byte *readbuf,
73 const gdb_byte *writebuf)
75 /* NOTE: cagney/2004-06-13: The gcc_p parameter to
76 USE_STRUCT_CONVENTION isn't used. */
77 int struct_return = ((TYPE_CODE (valtype) == TYPE_CODE_STRUCT
78 || TYPE_CODE (valtype) == TYPE_CODE_UNION
79 || TYPE_CODE (valtype) == TYPE_CODE_ARRAY)
80 && DEPRECATED_USE_STRUCT_CONVENTION (0, valtype));
84 gdb_assert (!struct_return);
85 /* NOTE: cagney/2004-06-13: See stack.c:return_command. Old
86 architectures don't expect STORE_RETURN_VALUE to handle small
87 structures. Should not be called with such types. */
88 gdb_assert (TYPE_CODE (valtype) != TYPE_CODE_STRUCT
89 && TYPE_CODE (valtype) != TYPE_CODE_UNION);
90 STORE_RETURN_VALUE (valtype, regcache, writebuf);
95 gdb_assert (!struct_return);
96 EXTRACT_RETURN_VALUE (valtype, regcache, readbuf);
100 return RETURN_VALUE_STRUCT_CONVENTION;
102 return RETURN_VALUE_REGISTER_CONVENTION;
106 legacy_register_sim_regno (int regnum)
108 /* Only makes sense to supply raw registers. */
109 gdb_assert (regnum >= 0 && regnum < NUM_REGS);
110 /* NOTE: cagney/2002-05-13: The old code did it this way and it is
111 suspected that some GDB/SIM combinations may rely on this
112 behavour. The default should be one2one_register_sim_regno
114 if (REGISTER_NAME (regnum) != NULL
115 && REGISTER_NAME (regnum)[0] != '\0')
118 return LEGACY_SIM_REGNO_IGNORE;
122 generic_skip_trampoline_code (CORE_ADDR pc)
128 generic_skip_solib_resolver (struct gdbarch *gdbarch, CORE_ADDR pc)
134 generic_in_solib_return_trampoline (CORE_ADDR pc, char *name)
140 generic_in_function_epilogue_p (struct gdbarch *gdbarch, CORE_ADDR pc)
146 generic_remote_translate_xfer_address (struct gdbarch *gdbarch,
147 struct regcache *regcache,
148 CORE_ADDR gdb_addr, int gdb_len,
149 CORE_ADDR * rem_addr, int *rem_len)
151 *rem_addr = gdb_addr;
155 /* Helper functions for INNER_THAN */
158 core_addr_lessthan (CORE_ADDR lhs, CORE_ADDR rhs)
164 core_addr_greaterthan (CORE_ADDR lhs, CORE_ADDR rhs)
170 /* Helper functions for TARGET_{FLOAT,DOUBLE}_FORMAT */
172 const struct floatformat *
173 default_float_format (struct gdbarch *gdbarch)
175 int byte_order = gdbarch_byte_order (gdbarch);
179 return &floatformat_ieee_single_big;
180 case BFD_ENDIAN_LITTLE:
181 return &floatformat_ieee_single_little;
183 internal_error (__FILE__, __LINE__,
184 _("default_float_format: bad byte order"));
189 const struct floatformat *
190 default_double_format (struct gdbarch *gdbarch)
192 int byte_order = gdbarch_byte_order (gdbarch);
196 return &floatformat_ieee_double_big;
197 case BFD_ENDIAN_LITTLE:
198 return &floatformat_ieee_double_little;
200 internal_error (__FILE__, __LINE__,
201 _("default_double_format: bad byte order"));
205 /* Misc helper functions for targets. */
208 core_addr_identity (CORE_ADDR addr)
214 convert_from_func_ptr_addr_identity (struct gdbarch *gdbarch, CORE_ADDR addr,
215 struct target_ops *targ)
221 no_op_reg_to_regnum (int reg)
227 default_elf_make_msymbol_special (asymbol *sym, struct minimal_symbol *msym)
233 default_coff_make_msymbol_special (int val, struct minimal_symbol *msym)
239 cannot_register_not (int regnum)
244 /* Legacy version of target_virtual_frame_pointer(). Assumes that
245 there is an DEPRECATED_FP_REGNUM and that it is the same, cooked or
249 legacy_virtual_frame_pointer (CORE_ADDR pc,
251 LONGEST *frame_offset)
253 /* FIXME: cagney/2002-09-13: This code is used when identifying the
254 frame pointer of the current PC. It is assuming that a single
255 register and an offset can determine this. I think it should
256 instead generate a byte code expression as that would work better
257 with things like Dwarf2's CFI. */
258 if (DEPRECATED_FP_REGNUM >= 0 && DEPRECATED_FP_REGNUM < NUM_REGS)
259 *frame_regnum = DEPRECATED_FP_REGNUM;
260 else if (SP_REGNUM >= 0 && SP_REGNUM < NUM_REGS)
261 *frame_regnum = SP_REGNUM;
263 /* Should this be an internal error? I guess so, it is reflecting
264 an architectural limitation in the current design. */
265 internal_error (__FILE__, __LINE__, _("No virtual frame pointer available"));
269 /* Assume the world is sane, every register's virtual and real size
273 generic_register_size (int regnum)
275 gdb_assert (regnum >= 0 && regnum < NUM_REGS + NUM_PSEUDO_REGS);
276 return TYPE_LENGTH (gdbarch_register_type (current_gdbarch, regnum));
279 /* Assume all registers are adjacent. */
282 generic_register_byte (int regnum)
286 gdb_assert (regnum >= 0 && regnum < NUM_REGS + NUM_PSEUDO_REGS);
288 for (i = 0; i < regnum; i++)
290 byte += generic_register_size (i);
297 legacy_pc_in_sigtramp (CORE_ADDR pc, char *name)
299 #if defined (DEPRECATED_IN_SIGTRAMP)
300 return DEPRECATED_IN_SIGTRAMP (pc, name);
302 return name && strcmp ("_sigtramp", name) == 0;
307 generic_convert_register_p (int regnum, struct type *type)
313 default_stabs_argument_has_addr (struct gdbarch *gdbarch, struct type *type)
315 if (DEPRECATED_REG_STRUCT_HAS_ADDR_P ()
316 && DEPRECATED_REG_STRUCT_HAS_ADDR (processing_gcc_compilation, type))
318 CHECK_TYPEDEF (type);
320 return (TYPE_CODE (type) == TYPE_CODE_STRUCT
321 || TYPE_CODE (type) == TYPE_CODE_UNION
322 || TYPE_CODE (type) == TYPE_CODE_SET
323 || TYPE_CODE (type) == TYPE_CODE_BITSTRING);
330 generic_instruction_nullified (struct gdbarch *gdbarch,
331 struct regcache *regcache)
337 /* Functions to manipulate the endianness of the target. */
339 static int target_byte_order_user = BFD_ENDIAN_UNKNOWN;
341 static const char endian_big[] = "big";
342 static const char endian_little[] = "little";
343 static const char endian_auto[] = "auto";
344 static const char *endian_enum[] =
351 static const char *set_endian_string;
353 /* Called by ``show endian''. */
356 show_endian (struct ui_file *file, int from_tty, struct cmd_list_element *c,
359 if (target_byte_order_user != BFD_ENDIAN_UNKNOWN)
360 if (TARGET_BYTE_ORDER == BFD_ENDIAN_BIG)
361 fprintf_unfiltered (file, _("The target endianness is set automatically "
362 "(currently big endian)\n"));
364 fprintf_unfiltered (file, _("The target endianness is set automatically "
365 "(currently little endian)\n"));
367 if (TARGET_BYTE_ORDER == BFD_ENDIAN_BIG)
368 fprintf_unfiltered (file,
369 _("The target is assumed to be big endian\n"));
371 fprintf_unfiltered (file,
372 _("The target is assumed to be little endian\n"));
376 set_endian (char *ignore_args, int from_tty, struct cmd_list_element *c)
378 struct gdbarch_info info;
380 gdbarch_info_init (&info);
382 if (set_endian_string == endian_auto)
384 target_byte_order_user = BFD_ENDIAN_UNKNOWN;
385 if (! gdbarch_update_p (info))
386 internal_error (__FILE__, __LINE__,
387 _("set_endian: architecture update failed"));
389 else if (set_endian_string == endian_little)
391 info.byte_order = BFD_ENDIAN_LITTLE;
392 if (! gdbarch_update_p (info))
393 printf_unfiltered (_("Little endian target not supported by GDB\n"));
395 target_byte_order_user = BFD_ENDIAN_LITTLE;
397 else if (set_endian_string == endian_big)
399 info.byte_order = BFD_ENDIAN_BIG;
400 if (! gdbarch_update_p (info))
401 printf_unfiltered (_("Big endian target not supported by GDB\n"));
403 target_byte_order_user = BFD_ENDIAN_BIG;
406 internal_error (__FILE__, __LINE__,
407 _("set_endian: bad value"));
409 show_endian (gdb_stdout, from_tty, NULL, NULL);
412 /* Functions to manipulate the architecture of the target */
414 enum set_arch { set_arch_auto, set_arch_manual };
416 static const struct bfd_arch_info *target_architecture_user;
418 static const char *set_architecture_string;
421 selected_architecture_name (void)
423 if (target_architecture_user == NULL)
426 return set_architecture_string;
429 /* Called if the user enters ``show architecture'' without an
433 show_architecture (struct ui_file *file, int from_tty,
434 struct cmd_list_element *c, const char *value)
437 arch = TARGET_ARCHITECTURE->printable_name;
438 if (target_architecture_user == NULL)
439 fprintf_filtered (file, _("\
440 The target architecture is set automatically (currently %s)\n"), arch);
442 fprintf_filtered (file, _("\
443 The target architecture is assumed to be %s\n"), arch);
447 /* Called if the user enters ``set architecture'' with or without an
451 set_architecture (char *ignore_args, int from_tty, struct cmd_list_element *c)
453 struct gdbarch_info info;
455 gdbarch_info_init (&info);
457 if (strcmp (set_architecture_string, "auto") == 0)
459 target_architecture_user = NULL;
460 if (!gdbarch_update_p (info))
461 internal_error (__FILE__, __LINE__,
462 _("could not select an architecture automatically"));
466 info.bfd_arch_info = bfd_scan_arch (set_architecture_string);
467 if (info.bfd_arch_info == NULL)
468 internal_error (__FILE__, __LINE__,
469 _("set_architecture: bfd_scan_arch failed"));
470 if (gdbarch_update_p (info))
471 target_architecture_user = info.bfd_arch_info;
473 printf_unfiltered (_("Architecture `%s' not recognized.\n"),
474 set_architecture_string);
476 show_architecture (gdb_stdout, from_tty, NULL, NULL);
479 /* Try to select a global architecture that matches "info". Return
480 non-zero if the attempt succeds. */
482 gdbarch_update_p (struct gdbarch_info info)
484 struct gdbarch *new_gdbarch = gdbarch_find_by_info (info);
486 /* If there no architecture by that name, reject the request. */
487 if (new_gdbarch == NULL)
490 fprintf_unfiltered (gdb_stdlog, "gdbarch_update_p: "
491 "Architecture not found\n");
495 /* If it is the same old architecture, accept the request (but don't
497 if (new_gdbarch == current_gdbarch)
500 fprintf_unfiltered (gdb_stdlog, "gdbarch_update_p: "
501 "Architecture 0x%08lx (%s) unchanged\n",
503 gdbarch_bfd_arch_info (new_gdbarch)->printable_name);
507 /* It's a new architecture, swap it in. */
509 fprintf_unfiltered (gdb_stdlog, "gdbarch_update_p: "
510 "New architecture 0x%08lx (%s) selected\n",
512 gdbarch_bfd_arch_info (new_gdbarch)->printable_name);
513 deprecated_current_gdbarch_select_hack (new_gdbarch);
518 /* Return the architecture for ABFD. If no suitable architecture
519 could be find, return NULL. */
522 gdbarch_from_bfd (bfd *abfd)
524 struct gdbarch *old_gdbarch = current_gdbarch;
525 struct gdbarch *new_gdbarch;
526 struct gdbarch_info info;
528 /* If we call gdbarch_find_by_info without filling in info.abfd,
529 then it will use the global exec_bfd. That's fine if we don't
530 have one of those either. And that's the only time we should
531 reach here with a NULL ABFD argument - when we are discarding
533 gdb_assert (abfd != NULL || exec_bfd == NULL);
535 gdbarch_info_init (&info);
537 return gdbarch_find_by_info (info);
540 /* Set the dynamic target-system-dependent parameters (architecture,
541 byte-order) using information found in the BFD */
544 set_gdbarch_from_file (bfd *abfd)
546 struct gdbarch *gdbarch;
548 gdbarch = gdbarch_from_bfd (abfd);
550 error (_("Architecture of file not recognized."));
551 deprecated_current_gdbarch_select_hack (gdbarch);
554 /* Initialize the current architecture. Update the ``set
555 architecture'' command so that it specifies a list of valid
558 #ifdef DEFAULT_BFD_ARCH
559 extern const bfd_arch_info_type DEFAULT_BFD_ARCH;
560 static const bfd_arch_info_type *default_bfd_arch = &DEFAULT_BFD_ARCH;
562 static const bfd_arch_info_type *default_bfd_arch;
565 #ifdef DEFAULT_BFD_VEC
566 extern const bfd_target DEFAULT_BFD_VEC;
567 static const bfd_target *default_bfd_vec = &DEFAULT_BFD_VEC;
569 static const bfd_target *default_bfd_vec;
572 static int default_byte_order = BFD_ENDIAN_UNKNOWN;
575 initialize_current_architecture (void)
577 const char **arches = gdbarch_printable_names ();
579 /* determine a default architecture and byte order. */
580 struct gdbarch_info info;
581 gdbarch_info_init (&info);
583 /* Find a default architecture. */
584 if (default_bfd_arch == NULL)
586 /* Choose the architecture by taking the first one
588 const char *chosen = arches[0];
590 for (arch = arches; *arch != NULL; arch++)
592 if (strcmp (*arch, chosen) < 0)
596 internal_error (__FILE__, __LINE__,
597 _("initialize_current_architecture: No arch"));
598 default_bfd_arch = bfd_scan_arch (chosen);
599 if (default_bfd_arch == NULL)
600 internal_error (__FILE__, __LINE__,
601 _("initialize_current_architecture: Arch not found"));
604 info.bfd_arch_info = default_bfd_arch;
606 /* Take several guesses at a byte order. */
607 if (default_byte_order == BFD_ENDIAN_UNKNOWN
608 && default_bfd_vec != NULL)
610 /* Extract BFD's default vector's byte order. */
611 switch (default_bfd_vec->byteorder)
614 default_byte_order = BFD_ENDIAN_BIG;
616 case BFD_ENDIAN_LITTLE:
617 default_byte_order = BFD_ENDIAN_LITTLE;
623 if (default_byte_order == BFD_ENDIAN_UNKNOWN)
625 /* look for ``*el-*'' in the target name. */
627 chp = strchr (target_name, '-');
629 && chp - 2 >= target_name
630 && strncmp (chp - 2, "el", 2) == 0)
631 default_byte_order = BFD_ENDIAN_LITTLE;
633 if (default_byte_order == BFD_ENDIAN_UNKNOWN)
635 /* Wire it to big-endian!!! */
636 default_byte_order = BFD_ENDIAN_BIG;
639 info.byte_order = default_byte_order;
641 if (! gdbarch_update_p (info))
642 internal_error (__FILE__, __LINE__,
643 _("initialize_current_architecture: Selection of "
644 "initial architecture failed"));
646 /* Create the ``set architecture'' command appending ``auto'' to the
647 list of architectures. */
649 struct cmd_list_element *c;
650 /* Append ``auto''. */
652 for (nr = 0; arches[nr] != NULL; nr++);
653 arches = xrealloc (arches, sizeof (char*) * (nr + 2));
654 arches[nr + 0] = "auto";
655 arches[nr + 1] = NULL;
656 add_setshow_enum_cmd ("architecture", class_support,
657 arches, &set_architecture_string, _("\
658 Set architecture of target."), _("\
659 Show architecture of target."), NULL,
660 set_architecture, show_architecture,
661 &setlist, &showlist);
662 add_alias_cmd ("processor", "architecture", class_support, 1, &setlist);
667 /* Initialize a gdbarch info to values that will be automatically
668 overridden. Note: Originally, this ``struct info'' was initialized
669 using memset(0). Unfortunately, that ran into problems, namely
670 BFD_ENDIAN_BIG is zero. An explicit initialization function that
671 can explicitly set each field to a well defined value is used. */
674 gdbarch_info_init (struct gdbarch_info *info)
676 memset (info, 0, sizeof (struct gdbarch_info));
677 info->byte_order = BFD_ENDIAN_UNKNOWN;
678 info->osabi = GDB_OSABI_UNINITIALIZED;
681 /* Similar to init, but this time fill in the blanks. Information is
682 obtained from the global "set ..." options and explicitly
683 initialized INFO fields. */
686 gdbarch_info_fill (struct gdbarch_info *info)
688 /* Check for the current file. */
689 if (info->abfd == NULL)
690 info->abfd = exec_bfd;
692 /* Check for the current target description. */
693 if (info->target_desc == NULL)
694 info->target_desc = target_current_description ();
696 /* "(gdb) set architecture ...". */
697 if (info->bfd_arch_info == NULL
698 && target_architecture_user)
699 info->bfd_arch_info = target_architecture_user;
701 if (info->bfd_arch_info == NULL
702 && info->abfd != NULL
703 && bfd_get_arch (info->abfd) != bfd_arch_unknown
704 && bfd_get_arch (info->abfd) != bfd_arch_obscure)
705 info->bfd_arch_info = bfd_get_arch_info (info->abfd);
706 /* From the default. */
707 if (info->bfd_arch_info == NULL)
708 info->bfd_arch_info = default_bfd_arch;
710 /* "(gdb) set byte-order ...". */
711 if (info->byte_order == BFD_ENDIAN_UNKNOWN
712 && target_byte_order_user != BFD_ENDIAN_UNKNOWN)
713 info->byte_order = target_byte_order_user;
714 /* From the INFO struct. */
715 if (info->byte_order == BFD_ENDIAN_UNKNOWN
716 && info->abfd != NULL)
717 info->byte_order = (bfd_big_endian (info->abfd) ? BFD_ENDIAN_BIG
718 : bfd_little_endian (info->abfd) ? BFD_ENDIAN_LITTLE
719 : BFD_ENDIAN_UNKNOWN);
720 /* From the default. */
721 if (info->byte_order == BFD_ENDIAN_UNKNOWN)
722 info->byte_order = default_byte_order;
724 /* "(gdb) set osabi ...". Handled by gdbarch_lookup_osabi. */
725 if (info->osabi == GDB_OSABI_UNINITIALIZED)
726 info->osabi = gdbarch_lookup_osabi (info->abfd);
728 /* Must have at least filled in the architecture. */
729 gdb_assert (info->bfd_arch_info != NULL);
734 extern initialize_file_ftype _initialize_gdbarch_utils; /* -Wmissing-prototypes */
737 _initialize_gdbarch_utils (void)
739 struct cmd_list_element *c;
740 add_setshow_enum_cmd ("endian", class_support,
741 endian_enum, &set_endian_string, _("\
742 Set endianness of target."), _("\
743 Show endianness of target."), NULL,
744 set_endian, show_endian,
745 &setlist, &showlist);