1 /* Dynamic architecture support for GDB, the GNU debugger.
3 Copyright 1998, 1999, 2000, 2001, 2002, 2003 Free Software Foundation,
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);
65 always_use_struct_convention (int gcc_p, struct type *value_type)
72 legacy_register_sim_regno (int regnum)
74 /* Only makes sense to supply raw registers. */
75 gdb_assert (regnum >= 0 && regnum < NUM_REGS);
76 /* NOTE: cagney/2002-05-13: The old code did it this way and it is
77 suspected that some GDB/SIM combinations may rely on this
78 behavour. The default should be one2one_register_sim_regno
80 if (REGISTER_NAME (regnum) != NULL
81 && REGISTER_NAME (regnum)[0] != '\0')
84 return LEGACY_SIM_REGNO_IGNORE;
88 generic_return_value_on_stack_not (struct type *type)
94 generic_skip_trampoline_code (CORE_ADDR pc)
100 generic_skip_solib_resolver (struct gdbarch *gdbarch, CORE_ADDR pc)
106 generic_in_solib_call_trampoline (CORE_ADDR pc, char *name)
112 generic_in_solib_return_trampoline (CORE_ADDR pc, char *name)
118 generic_in_function_epilogue_p (struct gdbarch *gdbarch, CORE_ADDR pc)
124 generic_remote_translate_xfer_address (struct gdbarch *gdbarch,
125 struct regcache *regcache,
126 CORE_ADDR gdb_addr, int gdb_len,
127 CORE_ADDR * rem_addr, int *rem_len)
129 *rem_addr = gdb_addr;
133 /* Helper functions for INNER_THAN */
136 core_addr_lessthan (CORE_ADDR lhs, CORE_ADDR rhs)
142 core_addr_greaterthan (CORE_ADDR lhs, CORE_ADDR rhs)
148 /* Helper functions for TARGET_{FLOAT,DOUBLE}_FORMAT */
150 const struct floatformat *
151 default_float_format (struct gdbarch *gdbarch)
153 int byte_order = gdbarch_byte_order (gdbarch);
157 return &floatformat_ieee_single_big;
158 case BFD_ENDIAN_LITTLE:
159 return &floatformat_ieee_single_little;
161 internal_error (__FILE__, __LINE__,
162 "default_float_format: bad byte order");
167 const struct floatformat *
168 default_double_format (struct gdbarch *gdbarch)
170 int byte_order = gdbarch_byte_order (gdbarch);
174 return &floatformat_ieee_double_big;
175 case BFD_ENDIAN_LITTLE:
176 return &floatformat_ieee_double_little;
178 internal_error (__FILE__, __LINE__,
179 "default_double_format: bad byte order");
183 /* Misc helper functions for targets. */
186 core_addr_identity (CORE_ADDR addr)
192 convert_from_func_ptr_addr_identity (struct gdbarch *gdbarch, CORE_ADDR addr,
193 struct target_ops *targ)
199 no_op_reg_to_regnum (int reg)
205 deprecated_init_frame_pc_default (int fromleaf, struct frame_info *prev)
207 if (fromleaf && DEPRECATED_SAVED_PC_AFTER_CALL_P ())
208 return DEPRECATED_SAVED_PC_AFTER_CALL (get_next_frame (prev));
209 else if (get_next_frame (prev) != NULL)
210 return DEPRECATED_FRAME_SAVED_PC (get_next_frame (prev));
216 default_elf_make_msymbol_special (asymbol *sym, struct minimal_symbol *msym)
222 default_coff_make_msymbol_special (int val, struct minimal_symbol *msym)
228 cannot_register_not (int regnum)
233 /* Legacy version of target_virtual_frame_pointer(). Assumes that
234 there is an DEPRECATED_FP_REGNUM and that it is the same, cooked or
238 legacy_virtual_frame_pointer (CORE_ADDR pc,
240 LONGEST *frame_offset)
242 /* FIXME: cagney/2002-09-13: This code is used when identifying the
243 frame pointer of the current PC. It is assuming that a single
244 register and an offset can determine this. I think it should
245 instead generate a byte code expression as that would work better
246 with things like Dwarf2's CFI. */
247 if (DEPRECATED_FP_REGNUM >= 0 && DEPRECATED_FP_REGNUM < NUM_REGS)
248 *frame_regnum = DEPRECATED_FP_REGNUM;
249 else if (SP_REGNUM >= 0 && SP_REGNUM < NUM_REGS)
250 *frame_regnum = SP_REGNUM;
252 /* Should this be an internal error? I guess so, it is reflecting
253 an architectural limitation in the current design. */
254 internal_error (__FILE__, __LINE__, "No virtual frame pointer available");
258 /* Assume the world is sane, every register's virtual and real size
262 generic_register_size (int regnum)
264 gdb_assert (regnum >= 0 && regnum < NUM_REGS + NUM_PSEUDO_REGS);
265 if (gdbarch_register_type_p (current_gdbarch))
266 return TYPE_LENGTH (gdbarch_register_type (current_gdbarch, regnum));
268 /* FIXME: cagney/2003-03-01: Once all architectures implement
269 gdbarch_register_type(), this entire function can go away. It
270 is made obsolete by register_size(). */
271 return TYPE_LENGTH (DEPRECATED_REGISTER_VIRTUAL_TYPE (regnum)); /* OK */
274 /* Assume all registers are adjacent. */
277 generic_register_byte (int regnum)
281 gdb_assert (regnum >= 0 && regnum < NUM_REGS + NUM_PSEUDO_REGS);
283 for (i = 0; i < regnum; i++)
285 byte += generic_register_size (i);
292 legacy_pc_in_sigtramp (CORE_ADDR pc, char *name)
294 #if defined (DEPRECATED_IN_SIGTRAMP)
295 return DEPRECATED_IN_SIGTRAMP (pc, name);
297 return name && strcmp ("_sigtramp", name) == 0;
302 generic_convert_register_p (int regnum, struct type *type)
308 default_stabs_argument_has_addr (struct gdbarch *gdbarch, struct type *type)
310 if (DEPRECATED_REG_STRUCT_HAS_ADDR_P ()
311 && DEPRECATED_REG_STRUCT_HAS_ADDR (processing_gcc_compilation, type))
313 CHECK_TYPEDEF (type);
315 return (TYPE_CODE (type) == TYPE_CODE_STRUCT
316 || TYPE_CODE (type) == TYPE_CODE_UNION
317 || TYPE_CODE (type) == TYPE_CODE_SET
318 || TYPE_CODE (type) == TYPE_CODE_BITSTRING);
325 /* Functions to manipulate the endianness of the target. */
327 /* ``target_byte_order'' is only used when non- multi-arch.
328 Multi-arch targets obtain the current byte order using the
329 TARGET_BYTE_ORDER gdbarch method.
331 The choice of initial value is entirely arbitrary. During startup,
332 the function initialize_current_architecture() updates this value
333 based on default byte-order information extracted from BFD. */
334 static int target_byte_order = BFD_ENDIAN_BIG;
335 static int target_byte_order_auto = 1;
338 selected_byte_order (void)
340 if (target_byte_order_auto)
341 return BFD_ENDIAN_UNKNOWN;
343 return target_byte_order;
346 static const char endian_big[] = "big";
347 static const char endian_little[] = "little";
348 static const char endian_auto[] = "auto";
349 static const char *endian_enum[] =
356 static const char *set_endian_string;
358 /* Called by ``show endian''. */
361 show_endian (char *args, int from_tty)
363 if (target_byte_order_auto)
364 printf_unfiltered ("The target endianness is set automatically (currently %s endian)\n",
365 (TARGET_BYTE_ORDER == BFD_ENDIAN_BIG ? "big" : "little"));
367 printf_unfiltered ("The target is assumed to be %s endian\n",
368 (TARGET_BYTE_ORDER == BFD_ENDIAN_BIG ? "big" : "little"));
372 set_endian (char *ignore_args, int from_tty, struct cmd_list_element *c)
374 if (set_endian_string == endian_auto)
376 target_byte_order_auto = 1;
378 else if (set_endian_string == endian_little)
380 struct gdbarch_info info;
381 target_byte_order_auto = 0;
382 gdbarch_info_init (&info);
383 info.byte_order = BFD_ENDIAN_LITTLE;
384 if (! gdbarch_update_p (info))
385 printf_unfiltered ("Little endian target not supported by GDB\n");
387 else if (set_endian_string == endian_big)
389 struct gdbarch_info info;
390 target_byte_order_auto = 0;
391 gdbarch_info_init (&info);
392 info.byte_order = BFD_ENDIAN_BIG;
393 if (! gdbarch_update_p (info))
394 printf_unfiltered ("Big endian target not supported by GDB\n");
397 internal_error (__FILE__, __LINE__,
398 "set_endian: bad value");
399 show_endian (NULL, from_tty);
402 /* Functions to manipulate the architecture of the target */
404 enum set_arch { set_arch_auto, set_arch_manual };
406 static int target_architecture_auto = 1;
408 static const char *set_architecture_string;
411 selected_architecture_name (void)
413 if (target_architecture_auto)
416 return set_architecture_string;
419 /* Called if the user enters ``show architecture'' without an
423 show_architecture (char *args, int from_tty)
426 arch = TARGET_ARCHITECTURE->printable_name;
427 if (target_architecture_auto)
428 printf_filtered ("The target architecture is set automatically (currently %s)\n", arch);
430 printf_filtered ("The target architecture is assumed to be %s\n", arch);
434 /* Called if the user enters ``set architecture'' with or without an
438 set_architecture (char *ignore_args, int from_tty, struct cmd_list_element *c)
440 if (strcmp (set_architecture_string, "auto") == 0)
442 target_architecture_auto = 1;
446 struct gdbarch_info info;
447 gdbarch_info_init (&info);
448 info.bfd_arch_info = bfd_scan_arch (set_architecture_string);
449 if (info.bfd_arch_info == NULL)
450 internal_error (__FILE__, __LINE__,
451 "set_architecture: bfd_scan_arch failed");
452 if (gdbarch_update_p (info))
453 target_architecture_auto = 0;
455 printf_unfiltered ("Architecture `%s' not recognized.\n",
456 set_architecture_string);
458 show_architecture (NULL, from_tty);
461 /* Try to select a global architecture that matches "info". Return
462 non-zero if the attempt succeds. */
464 gdbarch_update_p (struct gdbarch_info info)
466 struct gdbarch *new_gdbarch = gdbarch_find_by_info (info);
468 /* If there no architecture by that name, reject the request. */
469 if (new_gdbarch == NULL)
472 fprintf_unfiltered (gdb_stdlog, "gdbarch_update_p: "
473 "Architecture not found\n");
477 /* If it is the same old architecture, accept the request (but don't
479 if (new_gdbarch == current_gdbarch)
482 fprintf_unfiltered (gdb_stdlog, "gdbarch_update_p: "
483 "Architecture 0x%08lx (%s) unchanged\n",
485 gdbarch_bfd_arch_info (new_gdbarch)->printable_name);
489 /* It's a new architecture, swap it in. */
491 fprintf_unfiltered (gdb_stdlog, "gdbarch_update_p: "
492 "New architecture 0x%08lx (%s) selected\n",
494 gdbarch_bfd_arch_info (new_gdbarch)->printable_name);
495 deprecated_current_gdbarch_select_hack (new_gdbarch);
500 /* Return the architecture for ABFD. If no suitable architecture
501 could be find, return NULL. */
504 gdbarch_from_bfd (bfd *abfd)
506 struct gdbarch *old_gdbarch = current_gdbarch;
507 struct gdbarch *new_gdbarch;
508 struct gdbarch_info info;
510 gdbarch_info_init (&info);
512 return gdbarch_find_by_info (info);
515 /* Set the dynamic target-system-dependent parameters (architecture,
516 byte-order) using information found in the BFD */
519 set_gdbarch_from_file (bfd *abfd)
521 struct gdbarch *gdbarch;
523 gdbarch = gdbarch_from_bfd (abfd);
525 error ("Architecture of file not recognized.\n");
526 deprecated_current_gdbarch_select_hack (gdbarch);
529 /* Initialize the current architecture. Update the ``set
530 architecture'' command so that it specifies a list of valid
533 #ifdef DEFAULT_BFD_ARCH
534 extern const bfd_arch_info_type DEFAULT_BFD_ARCH;
535 static const bfd_arch_info_type *default_bfd_arch = &DEFAULT_BFD_ARCH;
537 static const bfd_arch_info_type *default_bfd_arch;
540 #ifdef DEFAULT_BFD_VEC
541 extern const bfd_target DEFAULT_BFD_VEC;
542 static const bfd_target *default_bfd_vec = &DEFAULT_BFD_VEC;
544 static const bfd_target *default_bfd_vec;
548 initialize_current_architecture (void)
550 const char **arches = gdbarch_printable_names ();
552 /* determine a default architecture and byte order. */
553 struct gdbarch_info info;
554 gdbarch_info_init (&info);
556 /* Find a default architecture. */
557 if (info.bfd_arch_info == NULL
558 && default_bfd_arch != NULL)
559 info.bfd_arch_info = default_bfd_arch;
560 if (info.bfd_arch_info == NULL)
562 /* Choose the architecture by taking the first one
564 const char *chosen = arches[0];
566 for (arch = arches; *arch != NULL; arch++)
568 if (strcmp (*arch, chosen) < 0)
572 internal_error (__FILE__, __LINE__,
573 "initialize_current_architecture: No arch");
574 info.bfd_arch_info = bfd_scan_arch (chosen);
575 if (info.bfd_arch_info == NULL)
576 internal_error (__FILE__, __LINE__,
577 "initialize_current_architecture: Arch not found");
580 /* Take several guesses at a byte order. */
581 if (info.byte_order == BFD_ENDIAN_UNKNOWN
582 && default_bfd_vec != NULL)
584 /* Extract BFD's default vector's byte order. */
585 switch (default_bfd_vec->byteorder)
588 info.byte_order = BFD_ENDIAN_BIG;
590 case BFD_ENDIAN_LITTLE:
591 info.byte_order = BFD_ENDIAN_LITTLE;
597 if (info.byte_order == BFD_ENDIAN_UNKNOWN)
599 /* look for ``*el-*'' in the target name. */
601 chp = strchr (target_name, '-');
603 && chp - 2 >= target_name
604 && strncmp (chp - 2, "el", 2) == 0)
605 info.byte_order = BFD_ENDIAN_LITTLE;
607 if (info.byte_order == BFD_ENDIAN_UNKNOWN)
609 /* Wire it to big-endian!!! */
610 info.byte_order = BFD_ENDIAN_BIG;
613 if (! gdbarch_update_p (info))
614 internal_error (__FILE__, __LINE__,
615 "initialize_current_architecture: Selection of initial architecture failed");
617 /* Create the ``set architecture'' command appending ``auto'' to the
618 list of architectures. */
620 struct cmd_list_element *c;
621 /* Append ``auto''. */
623 for (nr = 0; arches[nr] != NULL; nr++);
624 arches = xrealloc (arches, sizeof (char*) * (nr + 2));
625 arches[nr + 0] = "auto";
626 arches[nr + 1] = NULL;
627 /* FIXME: add_set_enum_cmd() uses an array of ``char *'' instead
628 of ``const char *''. We just happen to know that the casts are
630 c = add_set_enum_cmd ("architecture", class_support,
631 arches, &set_architecture_string,
632 "Set architecture of target.",
634 set_cmd_sfunc (c, set_architecture);
635 add_alias_cmd ("processor", "architecture", class_support, 1, &setlist);
636 /* Don't use set_from_show - need to print both auto/manual and
638 add_cmd ("architecture", class_support, show_architecture,
639 "Show the current target architecture", &showlist);
644 /* Initialize a gdbarch info to values that will be automatically
645 overridden. Note: Originally, this ``struct info'' was initialized
646 using memset(0). Unfortunately, that ran into problems, namely
647 BFD_ENDIAN_BIG is zero. An explicit initialization function that
648 can explicitly set each field to a well defined value is used. */
651 gdbarch_info_init (struct gdbarch_info *info)
653 memset (info, 0, sizeof (struct gdbarch_info));
654 info->byte_order = BFD_ENDIAN_UNKNOWN;
655 info->osabi = GDB_OSABI_UNINITIALIZED;
658 /* Similar to init, but this time fill in the blanks. Information is
659 obtained from the specified architecture, global "set ..." options,
660 and explicitly initialized INFO fields. */
663 gdbarch_info_fill (struct gdbarch *gdbarch, struct gdbarch_info *info)
665 /* "(gdb) set architecture ...". */
666 if (info->bfd_arch_info == NULL
667 && !target_architecture_auto
669 info->bfd_arch_info = gdbarch_bfd_arch_info (gdbarch);
670 if (info->bfd_arch_info == NULL
671 && info->abfd != NULL
672 && bfd_get_arch (info->abfd) != bfd_arch_unknown
673 && bfd_get_arch (info->abfd) != bfd_arch_obscure)
674 info->bfd_arch_info = bfd_get_arch_info (info->abfd);
675 if (info->bfd_arch_info == NULL
677 info->bfd_arch_info = gdbarch_bfd_arch_info (gdbarch);
679 /* "(gdb) set byte-order ...". */
680 if (info->byte_order == BFD_ENDIAN_UNKNOWN
681 && !target_byte_order_auto
683 info->byte_order = gdbarch_byte_order (gdbarch);
684 /* From the INFO struct. */
685 if (info->byte_order == BFD_ENDIAN_UNKNOWN
686 && info->abfd != NULL)
687 info->byte_order = (bfd_big_endian (info->abfd) ? BFD_ENDIAN_BIG
688 : bfd_little_endian (info->abfd) ? BFD_ENDIAN_LITTLE
689 : BFD_ENDIAN_UNKNOWN);
690 /* From the current target. */
691 if (info->byte_order == BFD_ENDIAN_UNKNOWN
693 info->byte_order = gdbarch_byte_order (gdbarch);
695 /* "(gdb) set osabi ...". Handled by gdbarch_lookup_osabi. */
696 if (info->osabi == GDB_OSABI_UNINITIALIZED)
697 info->osabi = gdbarch_lookup_osabi (info->abfd);
698 if (info->osabi == GDB_OSABI_UNINITIALIZED
700 info->osabi = gdbarch_osabi (gdbarch);
702 /* Must have at least filled in the architecture. */
703 gdb_assert (info->bfd_arch_info != NULL);
708 extern initialize_file_ftype _initialize_gdbarch_utils; /* -Wmissing-prototypes */
711 _initialize_gdbarch_utils (void)
713 struct cmd_list_element *c;
714 c = add_set_enum_cmd ("endian", class_support,
715 endian_enum, &set_endian_string,
716 "Set endianness of target.",
718 set_cmd_sfunc (c, set_endian);
719 /* Don't use set_from_show - need to print both auto/manual and
721 add_cmd ("endian", class_support, show_endian,
722 "Show the current byte-order", &showlist);