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. */
26 #include "arch-utils.h"
28 #include "inferior.h" /* enum CALL_DUMMY_LOCATION et.al. */
30 /* Just include everything in sight so that the every old definition
31 of macro is visible. */
35 #include "breakpoint.h"
42 #include "gdb_string.h"
44 #include "gdb_assert.h"
45 #include "sim-regno.h"
49 #include "floatformat.h"
51 /* Implementation of extract return value that grubs around in the
54 legacy_extract_return_value (struct type *type, struct regcache *regcache,
57 char *registers = deprecated_grub_regcache_for_registers (regcache);
58 bfd_byte *buf = valbuf;
59 DEPRECATED_EXTRACT_RETURN_VALUE (type, registers, buf); /* OK */
62 /* Implementation of store return value that grubs the register cache.
63 Takes a local copy of the buffer to avoid const problems. */
65 legacy_store_return_value (struct type *type, struct regcache *regcache,
68 bfd_byte *b = alloca (TYPE_LENGTH (type));
69 gdb_assert (regcache == current_regcache);
70 memcpy (b, buf, TYPE_LENGTH (type));
71 DEPRECATED_STORE_RETURN_VALUE (type, b);
76 always_use_struct_convention (int gcc_p, struct type *value_type)
83 legacy_register_sim_regno (int regnum)
85 /* Only makes sense to supply raw registers. */
86 gdb_assert (regnum >= 0 && regnum < NUM_REGS);
87 /* NOTE: cagney/2002-05-13: The old code did it this way and it is
88 suspected that some GDB/SIM combinations may rely on this
89 behavour. The default should be one2one_register_sim_regno
91 if (REGISTER_NAME (regnum) != NULL
92 && REGISTER_NAME (regnum)[0] != '\0')
95 return LEGACY_SIM_REGNO_IGNORE;
99 generic_frameless_function_invocation_not (struct frame_info *fi)
105 generic_return_value_on_stack_not (struct type *type)
111 generic_skip_trampoline_code (CORE_ADDR pc)
117 generic_in_solib_call_trampoline (CORE_ADDR pc, char *name)
123 generic_in_solib_return_trampoline (CORE_ADDR pc, char *name)
129 generic_in_function_epilogue_p (struct gdbarch *gdbarch, CORE_ADDR pc)
135 legacy_register_name (int i)
137 #ifdef REGISTER_NAMES
138 static char *names[] = REGISTER_NAMES;
139 if (i < 0 || i >= (sizeof (names) / sizeof (*names)))
144 internal_error (__FILE__, __LINE__,
145 "legacy_register_name: called.");
150 #if defined (CALL_DUMMY)
151 LONGEST legacy_call_dummy_words[] = CALL_DUMMY;
153 LONGEST legacy_call_dummy_words[1];
155 int legacy_sizeof_call_dummy_words = sizeof (legacy_call_dummy_words);
158 generic_remote_translate_xfer_address (struct gdbarch *gdbarch,
159 struct regcache *regcache,
160 CORE_ADDR gdb_addr, int gdb_len,
161 CORE_ADDR * rem_addr, int *rem_len)
163 *rem_addr = gdb_addr;
168 generic_prologue_frameless_p (CORE_ADDR ip)
170 return ip == SKIP_PROLOGUE (ip);
173 /* New/multi-arched targets should use the correct gdbarch field
174 instead of using this global pointer. */
176 legacy_print_insn (bfd_vma vma, disassemble_info *info)
178 return (*deprecated_tm_print_insn) (vma, info);
181 /* Helper functions for INNER_THAN */
184 core_addr_lessthan (CORE_ADDR lhs, CORE_ADDR rhs)
190 core_addr_greaterthan (CORE_ADDR lhs, CORE_ADDR rhs)
196 /* Helper functions for TARGET_{FLOAT,DOUBLE}_FORMAT */
198 const struct floatformat *
199 default_float_format (struct gdbarch *gdbarch)
202 int byte_order = gdbarch_byte_order (gdbarch);
204 int byte_order = TARGET_BYTE_ORDER;
209 return &floatformat_ieee_single_big;
210 case BFD_ENDIAN_LITTLE:
211 return &floatformat_ieee_single_little;
213 internal_error (__FILE__, __LINE__,
214 "default_float_format: bad byte order");
219 const struct floatformat *
220 default_double_format (struct gdbarch *gdbarch)
223 int byte_order = gdbarch_byte_order (gdbarch);
225 int byte_order = TARGET_BYTE_ORDER;
230 return &floatformat_ieee_double_big;
231 case BFD_ENDIAN_LITTLE:
232 return &floatformat_ieee_double_little;
234 internal_error (__FILE__, __LINE__,
235 "default_double_format: bad byte order");
239 /* Misc helper functions for targets. */
242 deprecated_register_convertible_not (int num)
248 /* Under some ABI's that specify the `struct convention' for returning
249 structures by value, by the time we've returned from the function,
250 the return value is sitting there in the caller's buffer, but GDB
251 has no way to find the address of that buffer.
253 On such architectures, use this function as your
254 extract_struct_value_address method. When asked to a struct
255 returned by value in this fashion, GDB will print a nice error
256 message, instead of garbage. */
258 generic_cannot_extract_struct_value_address (char *dummy)
264 core_addr_identity (CORE_ADDR addr)
270 no_op_reg_to_regnum (int reg)
276 init_frame_pc_noop (int fromleaf, struct frame_info *prev)
278 /* Do nothing, implies return the same PC value. */
279 return get_frame_pc (prev);
283 init_frame_pc_default (int fromleaf, struct frame_info *prev)
285 if (fromleaf && DEPRECATED_SAVED_PC_AFTER_CALL_P ())
286 return DEPRECATED_SAVED_PC_AFTER_CALL (get_next_frame (prev));
287 else if (get_next_frame (prev) != NULL)
288 return DEPRECATED_FRAME_SAVED_PC (get_next_frame (prev));
294 default_elf_make_msymbol_special (asymbol *sym, struct minimal_symbol *msym)
300 default_coff_make_msymbol_special (int val, struct minimal_symbol *msym)
306 cannot_register_not (int regnum)
311 /* Legacy version of target_virtual_frame_pointer(). Assumes that
312 there is an DEPRECATED_FP_REGNUM and that it is the same, cooked or
316 legacy_virtual_frame_pointer (CORE_ADDR pc,
318 LONGEST *frame_offset)
320 /* FIXME: cagney/2002-09-13: This code is used when identifying the
321 frame pointer of the current PC. It is assuming that a single
322 register and an offset can determine this. I think it should
323 instead generate a byte code expression as that would work better
324 with things like Dwarf2's CFI. */
325 if (DEPRECATED_FP_REGNUM >= 0 && DEPRECATED_FP_REGNUM < NUM_REGS)
326 *frame_regnum = DEPRECATED_FP_REGNUM;
327 else if (SP_REGNUM >= 0 && SP_REGNUM < NUM_REGS)
328 *frame_regnum = SP_REGNUM;
330 /* Should this be an internal error? I guess so, it is reflecting
331 an architectural limitation in the current design. */
332 internal_error (__FILE__, __LINE__, "No virtual frame pointer available");
336 /* Assume the world is sane, every register's virtual and real size
340 generic_register_size (int regnum)
342 gdb_assert (regnum >= 0 && regnum < NUM_REGS + NUM_PSEUDO_REGS);
343 if (gdbarch_register_type_p (current_gdbarch))
344 return TYPE_LENGTH (gdbarch_register_type (current_gdbarch, regnum));
346 /* FIXME: cagney/2003-03-01: Once all architectures implement
347 gdbarch_register_type(), this entire function can go away. It
348 is made obsolete by register_size(). */
349 return TYPE_LENGTH (REGISTER_VIRTUAL_TYPE (regnum)); /* OK */
352 /* Assume all registers are adjacent. */
355 generic_register_byte (int regnum)
359 gdb_assert (regnum >= 0 && regnum < NUM_REGS + NUM_PSEUDO_REGS);
361 for (i = 0; i < regnum; i++)
363 byte += generic_register_size (i);
370 legacy_pc_in_sigtramp (CORE_ADDR pc, char *name)
372 #if !defined (IN_SIGTRAMP)
373 if (SIGTRAMP_START_P ())
374 return (pc) >= SIGTRAMP_START (pc) && (pc) < SIGTRAMP_END (pc);
376 return name && strcmp ("_sigtramp", name) == 0;
378 return IN_SIGTRAMP (pc, name);
383 legacy_convert_register_p (int regnum, struct type *type)
385 return DEPRECATED_REGISTER_CONVERTIBLE (regnum);
389 legacy_register_to_value (struct frame_info *frame, int regnum,
390 struct type *type, void *to)
392 char from[MAX_REGISTER_SIZE];
393 frame_read_register (frame, regnum, from);
394 DEPRECATED_REGISTER_CONVERT_TO_VIRTUAL (regnum, type, from, to);
398 legacy_value_to_register (struct frame_info *frame, int regnum,
399 struct type *type, const void *tmp)
401 char to[MAX_REGISTER_SIZE];
402 char *from = alloca (TYPE_LENGTH (type));
403 memcpy (from, from, TYPE_LENGTH (type));
404 DEPRECATED_REGISTER_CONVERT_TO_RAW (type, regnum, from, to);
405 put_frame_register (frame, regnum, to);
409 /* Functions to manipulate the endianness of the target. */
411 /* ``target_byte_order'' is only used when non- multi-arch.
412 Multi-arch targets obtain the current byte order using the
413 TARGET_BYTE_ORDER gdbarch method.
415 The choice of initial value is entirely arbitrary. During startup,
416 the function initialize_current_architecture() updates this value
417 based on default byte-order information extracted from BFD. */
418 int target_byte_order = BFD_ENDIAN_BIG;
419 int target_byte_order_auto = 1;
421 static const char endian_big[] = "big";
422 static const char endian_little[] = "little";
423 static const char endian_auto[] = "auto";
424 static const char *endian_enum[] =
431 static const char *set_endian_string;
433 /* Called by ``show endian''. */
436 show_endian (char *args, int from_tty)
438 if (TARGET_BYTE_ORDER_AUTO)
439 printf_unfiltered ("The target endianness is set automatically (currently %s endian)\n",
440 (TARGET_BYTE_ORDER == BFD_ENDIAN_BIG ? "big" : "little"));
442 printf_unfiltered ("The target is assumed to be %s endian\n",
443 (TARGET_BYTE_ORDER == BFD_ENDIAN_BIG ? "big" : "little"));
447 set_endian (char *ignore_args, int from_tty, struct cmd_list_element *c)
449 if (set_endian_string == endian_auto)
451 target_byte_order_auto = 1;
453 else if (set_endian_string == endian_little)
455 target_byte_order_auto = 0;
458 struct gdbarch_info info;
459 gdbarch_info_init (&info);
460 info.byte_order = BFD_ENDIAN_LITTLE;
461 if (! gdbarch_update_p (info))
463 printf_unfiltered ("Little endian target not supported by GDB\n");
468 target_byte_order = BFD_ENDIAN_LITTLE;
471 else if (set_endian_string == endian_big)
473 target_byte_order_auto = 0;
476 struct gdbarch_info info;
477 gdbarch_info_init (&info);
478 info.byte_order = BFD_ENDIAN_BIG;
479 if (! gdbarch_update_p (info))
481 printf_unfiltered ("Big endian target not supported by GDB\n");
486 target_byte_order = BFD_ENDIAN_BIG;
490 internal_error (__FILE__, __LINE__,
491 "set_endian: bad value");
492 show_endian (NULL, from_tty);
495 /* Set the endianness from a BFD. */
498 set_endian_from_file (bfd *abfd)
502 internal_error (__FILE__, __LINE__,
503 "set_endian_from_file: not for multi-arch");
504 if (bfd_big_endian (abfd))
505 want = BFD_ENDIAN_BIG;
507 want = BFD_ENDIAN_LITTLE;
508 if (TARGET_BYTE_ORDER_AUTO)
509 target_byte_order = want;
510 else if (TARGET_BYTE_ORDER != want)
511 warning ("%s endian file does not match %s endian target.",
512 want == BFD_ENDIAN_BIG ? "big" : "little",
513 TARGET_BYTE_ORDER == BFD_ENDIAN_BIG ? "big" : "little");
517 /* Functions to manipulate the architecture of the target */
519 enum set_arch { set_arch_auto, set_arch_manual };
521 int target_architecture_auto = 1;
523 const char *set_architecture_string;
525 /* Old way of changing the current architecture. */
527 extern const struct bfd_arch_info bfd_default_arch_struct;
528 const struct bfd_arch_info *target_architecture = &bfd_default_arch_struct;
529 int (*target_architecture_hook) (const struct bfd_arch_info *ap);
532 arch_ok (const struct bfd_arch_info *arch)
535 internal_error (__FILE__, __LINE__,
536 "arch_ok: not multi-arched");
537 /* Should be performing the more basic check that the binary is
538 compatible with GDB. */
539 /* Check with the target that the architecture is valid. */
540 return (target_architecture_hook == NULL
541 || target_architecture_hook (arch));
545 set_arch (const struct bfd_arch_info *arch,
549 internal_error (__FILE__, __LINE__,
550 "set_arch: not multi-arched");
555 warning ("Target may not support %s architecture",
556 arch->printable_name);
557 target_architecture = arch;
559 case set_arch_manual:
562 printf_unfiltered ("Target does not support `%s' architecture.\n",
563 arch->printable_name);
567 target_architecture_auto = 0;
568 target_architecture = arch;
573 gdbarch_dump (current_gdbarch, gdb_stdlog);
576 /* Set the architecture from arch/machine (deprecated) */
579 set_architecture_from_arch_mach (enum bfd_architecture arch,
582 const struct bfd_arch_info *wanted = bfd_lookup_arch (arch, mach);
584 internal_error (__FILE__, __LINE__,
585 "set_architecture_from_arch_mach: not multi-arched");
587 set_arch (wanted, set_arch_manual);
589 internal_error (__FILE__, __LINE__,
590 "gdbarch: hardwired architecture/machine not recognized");
593 /* Set the architecture from a BFD (deprecated) */
596 set_architecture_from_file (bfd *abfd)
598 const struct bfd_arch_info *wanted = bfd_get_arch_info (abfd);
600 internal_error (__FILE__, __LINE__,
601 "set_architecture_from_file: not multi-arched");
602 if (target_architecture_auto)
604 set_arch (wanted, set_arch_auto);
606 else if (wanted != target_architecture)
608 warning ("%s architecture file may be incompatible with %s target.",
609 wanted->printable_name,
610 target_architecture->printable_name);
615 /* Called if the user enters ``show architecture'' without an
619 show_architecture (char *args, int from_tty)
622 arch = TARGET_ARCHITECTURE->printable_name;
623 if (target_architecture_auto)
624 printf_filtered ("The target architecture is set automatically (currently %s)\n", arch);
626 printf_filtered ("The target architecture is assumed to be %s\n", arch);
630 /* Called if the user enters ``set architecture'' with or without an
634 set_architecture (char *ignore_args, int from_tty, struct cmd_list_element *c)
636 if (strcmp (set_architecture_string, "auto") == 0)
638 target_architecture_auto = 1;
640 else if (GDB_MULTI_ARCH)
642 struct gdbarch_info info;
643 gdbarch_info_init (&info);
644 info.bfd_arch_info = bfd_scan_arch (set_architecture_string);
645 if (info.bfd_arch_info == NULL)
646 internal_error (__FILE__, __LINE__,
647 "set_architecture: bfd_scan_arch failed");
648 if (gdbarch_update_p (info))
649 target_architecture_auto = 0;
651 printf_unfiltered ("Architecture `%s' not recognized.\n",
652 set_architecture_string);
656 const struct bfd_arch_info *arch
657 = bfd_scan_arch (set_architecture_string);
659 internal_error (__FILE__, __LINE__,
660 "set_architecture: bfd_scan_arch failed");
661 set_arch (arch, set_arch_manual);
663 show_architecture (NULL, from_tty);
666 /* Set the dynamic target-system-dependent parameters (architecture,
667 byte-order) using information found in the BFD */
670 set_gdbarch_from_file (bfd *abfd)
674 struct gdbarch_info info;
675 gdbarch_info_init (&info);
677 if (! gdbarch_update_p (info))
678 error ("Architecture of file not recognized.\n");
682 set_architecture_from_file (abfd);
683 set_endian_from_file (abfd);
687 /* Initialize the current architecture. Update the ``set
688 architecture'' command so that it specifies a list of valid
691 #ifdef DEFAULT_BFD_ARCH
692 extern const bfd_arch_info_type DEFAULT_BFD_ARCH;
693 static const bfd_arch_info_type *default_bfd_arch = &DEFAULT_BFD_ARCH;
695 static const bfd_arch_info_type *default_bfd_arch;
698 #ifdef DEFAULT_BFD_VEC
699 extern const bfd_target DEFAULT_BFD_VEC;
700 static const bfd_target *default_bfd_vec = &DEFAULT_BFD_VEC;
702 static const bfd_target *default_bfd_vec;
706 initialize_current_architecture (void)
708 const char **arches = gdbarch_printable_names ();
710 /* determine a default architecture and byte order. */
711 struct gdbarch_info info;
712 gdbarch_info_init (&info);
714 /* Find a default architecture. */
715 if (info.bfd_arch_info == NULL
716 && default_bfd_arch != NULL)
717 info.bfd_arch_info = default_bfd_arch;
718 if (info.bfd_arch_info == NULL)
720 /* Choose the architecture by taking the first one
722 const char *chosen = arches[0];
724 for (arch = arches; *arch != NULL; arch++)
726 if (strcmp (*arch, chosen) < 0)
730 internal_error (__FILE__, __LINE__,
731 "initialize_current_architecture: No arch");
732 info.bfd_arch_info = bfd_scan_arch (chosen);
733 if (info.bfd_arch_info == NULL)
734 internal_error (__FILE__, __LINE__,
735 "initialize_current_architecture: Arch not found");
738 /* Take several guesses at a byte order. */
739 if (info.byte_order == BFD_ENDIAN_UNKNOWN
740 && default_bfd_vec != NULL)
742 /* Extract BFD's default vector's byte order. */
743 switch (default_bfd_vec->byteorder)
746 info.byte_order = BFD_ENDIAN_BIG;
748 case BFD_ENDIAN_LITTLE:
749 info.byte_order = BFD_ENDIAN_LITTLE;
755 if (info.byte_order == BFD_ENDIAN_UNKNOWN)
757 /* look for ``*el-*'' in the target name. */
759 chp = strchr (target_name, '-');
761 && chp - 2 >= target_name
762 && strncmp (chp - 2, "el", 2) == 0)
763 info.byte_order = BFD_ENDIAN_LITTLE;
765 if (info.byte_order == BFD_ENDIAN_UNKNOWN)
767 /* Wire it to big-endian!!! */
768 info.byte_order = BFD_ENDIAN_BIG;
773 if (! gdbarch_update_p (info))
775 internal_error (__FILE__, __LINE__,
776 "initialize_current_architecture: Selection of initial architecture failed");
781 /* If the multi-arch logic comes up with a byte-order (from BFD)
782 use it for the non-multi-arch case. */
783 if (info.byte_order != BFD_ENDIAN_UNKNOWN)
784 target_byte_order = info.byte_order;
785 initialize_non_multiarch ();
788 /* Create the ``set architecture'' command appending ``auto'' to the
789 list of architectures. */
791 struct cmd_list_element *c;
792 /* Append ``auto''. */
794 for (nr = 0; arches[nr] != NULL; nr++);
795 arches = xrealloc (arches, sizeof (char*) * (nr + 2));
796 arches[nr + 0] = "auto";
797 arches[nr + 1] = NULL;
798 /* FIXME: add_set_enum_cmd() uses an array of ``char *'' instead
799 of ``const char *''. We just happen to know that the casts are
801 c = add_set_enum_cmd ("architecture", class_support,
802 arches, &set_architecture_string,
803 "Set architecture of target.",
805 set_cmd_sfunc (c, set_architecture);
806 add_alias_cmd ("processor", "architecture", class_support, 1, &setlist);
807 /* Don't use set_from_show - need to print both auto/manual and
809 add_cmd ("architecture", class_support, show_architecture,
810 "Show the current target architecture", &showlist);
815 /* Initialize a gdbarch info to values that will be automatically
816 overridden. Note: Originally, this ``struct info'' was initialized
817 using memset(0). Unfortunatly, that ran into problems, namely
818 BFD_ENDIAN_BIG is zero. An explicit initialization function that
819 can explicitly set each field to a well defined value is used. */
822 gdbarch_info_init (struct gdbarch_info *info)
824 memset (info, 0, sizeof (struct gdbarch_info));
825 info->byte_order = BFD_ENDIAN_UNKNOWN;
826 info->osabi = GDB_OSABI_UNINITIALIZED;
831 extern initialize_file_ftype _initialize_gdbarch_utils; /* -Wmissing-prototypes */
834 _initialize_gdbarch_utils (void)
836 struct cmd_list_element *c;
837 c = add_set_enum_cmd ("endian", class_support,
838 endian_enum, &set_endian_string,
839 "Set endianness of target.",
841 set_cmd_sfunc (c, set_endian);
842 /* Don't use set_from_show - need to print both auto/manual and
844 add_cmd ("endian", class_support, show_endian,
845 "Show the current byte-order", &showlist);