1 /* Dynamic architecture support for GDB, the GNU debugger.
3 Copyright 1998, 1999, 2000, 2001, 2002 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 /* Use the program counter to determine the contents and size
52 of a breakpoint instruction. If no target-dependent macro
53 BREAKPOINT_FROM_PC has been defined to implement this function,
54 assume that the breakpoint doesn't depend on the PC, and
55 use the values of the BIG_BREAKPOINT and LITTLE_BREAKPOINT macros.
56 Return a pointer to a string of bytes that encode a breakpoint
57 instruction, stores the length of the string to *lenptr,
58 and optionally adjust the pc to point to the correct memory location
59 for inserting the breakpoint. */
62 legacy_breakpoint_from_pc (CORE_ADDR * pcptr, int *lenptr)
64 /* {BIG_,LITTLE_}BREAKPOINT is the sequence of bytes we insert for a
65 breakpoint. On some machines, breakpoints are handled by the
66 target environment and we don't have to worry about them here. */
68 if (TARGET_BYTE_ORDER == BFD_ENDIAN_BIG)
70 static unsigned char big_break_insn[] = BIG_BREAKPOINT;
71 *lenptr = sizeof (big_break_insn);
72 return big_break_insn;
75 #ifdef LITTLE_BREAKPOINT
76 if (TARGET_BYTE_ORDER != BFD_ENDIAN_BIG)
78 static unsigned char little_break_insn[] = LITTLE_BREAKPOINT;
79 *lenptr = sizeof (little_break_insn);
80 return little_break_insn;
85 static unsigned char break_insn[] = BREAKPOINT;
86 *lenptr = sizeof (break_insn);
94 /* Implementation of extract return value that grubs around in the
97 legacy_extract_return_value (struct type *type, struct regcache *regcache,
100 char *registers = deprecated_grub_regcache_for_registers (regcache);
101 bfd_byte *buf = valbuf;
102 DEPRECATED_EXTRACT_RETURN_VALUE (type, registers, buf);
105 /* Implementation of store return value that grubs the register cache.
106 Takes a local copy of the buffer to avoid const problems. */
108 legacy_store_return_value (struct type *type, struct regcache *regcache,
111 bfd_byte *b = alloca (TYPE_LENGTH (type));
112 gdb_assert (regcache == current_regcache);
113 memcpy (b, buf, TYPE_LENGTH (type));
114 DEPRECATED_STORE_RETURN_VALUE (type, b);
119 legacy_register_sim_regno (int regnum)
121 /* Only makes sense to supply raw registers. */
122 gdb_assert (regnum >= 0 && regnum < NUM_REGS);
123 /* NOTE: cagney/2002-05-13: The old code did it this way and it is
124 suspected that some GDB/SIM combinations may rely on this
125 behavour. The default should be one2one_register_sim_regno
127 if (REGISTER_NAME (regnum) != NULL
128 && REGISTER_NAME (regnum)[0] != '\0')
131 return LEGACY_SIM_REGNO_IGNORE;
135 generic_frameless_function_invocation_not (struct frame_info *fi)
141 generic_return_value_on_stack_not (struct type *type)
147 generic_skip_trampoline_code (CORE_ADDR pc)
153 generic_in_solib_call_trampoline (CORE_ADDR pc, char *name)
159 generic_in_solib_return_trampoline (CORE_ADDR pc, char *name)
165 generic_in_function_epilogue_p (struct gdbarch *gdbarch, CORE_ADDR pc)
171 legacy_register_name (int i)
173 #ifdef REGISTER_NAMES
174 static char *names[] = REGISTER_NAMES;
175 if (i < 0 || i >= (sizeof (names) / sizeof (*names)))
180 internal_error (__FILE__, __LINE__,
181 "legacy_register_name: called.");
186 #if defined (CALL_DUMMY)
187 LONGEST legacy_call_dummy_words[] = CALL_DUMMY;
189 LONGEST legacy_call_dummy_words[1];
191 int legacy_sizeof_call_dummy_words = sizeof (legacy_call_dummy_words);
194 generic_remote_translate_xfer_address (CORE_ADDR gdb_addr, int gdb_len,
195 CORE_ADDR * rem_addr, int *rem_len)
197 *rem_addr = gdb_addr;
202 generic_prologue_frameless_p (CORE_ADDR ip)
204 return ip == SKIP_PROLOGUE (ip);
207 /* New/multi-arched targets should use the correct gdbarch field
208 instead of using this global pointer. */
210 legacy_print_insn (bfd_vma vma, disassemble_info *info)
212 return (*tm_print_insn) (vma, info);
215 /* Helper functions for INNER_THAN */
218 core_addr_lessthan (CORE_ADDR lhs, CORE_ADDR rhs)
224 core_addr_greaterthan (CORE_ADDR lhs, CORE_ADDR rhs)
230 /* Helper functions for TARGET_{FLOAT,DOUBLE}_FORMAT */
232 const struct floatformat *
233 default_float_format (struct gdbarch *gdbarch)
236 int byte_order = gdbarch_byte_order (gdbarch);
238 int byte_order = TARGET_BYTE_ORDER;
243 return &floatformat_ieee_single_big;
244 case BFD_ENDIAN_LITTLE:
245 return &floatformat_ieee_single_little;
247 internal_error (__FILE__, __LINE__,
248 "default_float_format: bad byte order");
253 const struct floatformat *
254 default_double_format (struct gdbarch *gdbarch)
257 int byte_order = gdbarch_byte_order (gdbarch);
259 int byte_order = TARGET_BYTE_ORDER;
264 return &floatformat_ieee_double_big;
265 case BFD_ENDIAN_LITTLE:
266 return &floatformat_ieee_double_little;
268 internal_error (__FILE__, __LINE__,
269 "default_double_format: bad byte order");
273 /* Misc helper functions for targets. */
276 frame_num_args_unknown (struct frame_info *fi)
283 generic_register_convertible_not (int num)
289 /* Under some ABI's that specify the `struct convention' for returning
290 structures by value, by the time we've returned from the function,
291 the return value is sitting there in the caller's buffer, but GDB
292 has no way to find the address of that buffer.
294 On such architectures, use this function as your
295 extract_struct_value_address method. When asked to a struct
296 returned by value in this fashion, GDB will print a nice error
297 message, instead of garbage. */
299 generic_cannot_extract_struct_value_address (char *dummy)
305 core_addr_identity (CORE_ADDR addr)
311 no_op_reg_to_regnum (int reg)
316 /* For use by frame_args_address and frame_locals_address. */
318 default_frame_address (struct frame_info *fi)
323 /* Default prepare_to_procced(). */
325 default_prepare_to_proceed (int select_it)
330 /* Generic prepare_to_proceed(). This one should be suitable for most
331 targets that support threads. */
333 generic_prepare_to_proceed (int select_it)
336 struct target_waitstatus wait_status;
338 /* Get the last target status returned by target_wait(). */
339 get_last_target_status (&wait_ptid, &wait_status);
341 /* Make sure we were stopped either at a breakpoint, or because
343 if (wait_status.kind != TARGET_WAITKIND_STOPPED
344 || (wait_status.value.sig != TARGET_SIGNAL_TRAP &&
345 wait_status.value.sig != TARGET_SIGNAL_INT))
350 if (!ptid_equal (wait_ptid, minus_one_ptid)
351 && !ptid_equal (inferior_ptid, wait_ptid))
353 /* Switched over from WAIT_PID. */
354 CORE_ADDR wait_pc = read_pc_pid (wait_ptid);
356 if (wait_pc != read_pc ())
360 /* Switch back to WAIT_PID thread. */
361 inferior_ptid = wait_ptid;
363 /* FIXME: This stuff came from switch_to_thread() in
364 thread.c (which should probably be a public function). */
365 flush_cached_frames ();
366 registers_changed ();
368 select_frame (get_current_frame ());
370 /* We return 1 to indicate that there is a breakpoint here,
371 so we need to step over it before continuing to avoid
372 hitting it straight away. */
373 if (breakpoint_here_p (wait_pc))
384 init_frame_pc_noop (int fromleaf, struct frame_info *prev)
390 init_frame_pc_default (int fromleaf, struct frame_info *prev)
393 prev->pc = SAVED_PC_AFTER_CALL (prev->next);
394 else if (prev->next != NULL)
395 prev->pc = FRAME_SAVED_PC (prev->next);
397 prev->pc = read_pc ();
401 default_elf_make_msymbol_special (asymbol *sym, struct minimal_symbol *msym)
407 default_coff_make_msymbol_special (int val, struct minimal_symbol *msym)
413 cannot_register_not (int regnum)
418 /* Legacy version of target_virtual_frame_pointer(). Assumes that
419 there is an FP_REGNUM and that it is the same, cooked or raw. */
422 legacy_virtual_frame_pointer (CORE_ADDR pc,
424 LONGEST *frame_offset)
426 gdb_assert (FP_REGNUM >= 0);
427 *frame_regnum = FP_REGNUM;
431 /* Assume the world is sane, every register's virtual and real size
435 generic_register_size (int regnum)
437 gdb_assert (regnum >= 0 && regnum < NUM_REGS + NUM_PSEUDO_REGS);
438 return TYPE_LENGTH (REGISTER_VIRTUAL_TYPE (regnum));
441 /* Assume all registers are adjacent. */
444 generic_register_byte (int regnum)
448 gdb_assert (regnum >= 0 && regnum < NUM_REGS + NUM_PSEUDO_REGS);
450 for (i = 0; i < regnum; i++)
452 byte += TYPE_LENGTH (REGISTER_VIRTUAL_TYPE (i));
459 legacy_pc_in_sigtramp (CORE_ADDR pc, char *name)
461 #if !defined (IN_SIGTRAMP)
462 if (SIGTRAMP_START_P ())
463 return (pc) >= SIGTRAMP_START (pc) && (pc) < SIGTRAMP_END (pc);
465 return name && strcmp ("_sigtramp", name) == 0;
467 return IN_SIGTRAMP (pc, name);
472 legacy_convert_register_p (int regnum)
474 return REGISTER_CONVERTIBLE (regnum);
478 legacy_register_to_value (int regnum, struct type *type,
479 char *from, char *to)
481 REGISTER_CONVERT_TO_VIRTUAL (regnum, type, from, to);
485 legacy_value_to_register (struct type *type, int regnum,
486 char *from, char *to)
488 REGISTER_CONVERT_TO_RAW (type, regnum, from, to);
492 /* Functions to manipulate the endianness of the target. */
494 /* ``target_byte_order'' is only used when non- multi-arch.
495 Multi-arch targets obtain the current byte order using the
496 TARGET_BYTE_ORDER gdbarch method.
498 The choice of initial value is entirely arbitrary. During startup,
499 the function initialize_current_architecture() updates this value
500 based on default byte-order information extracted from BFD. */
501 int target_byte_order = BFD_ENDIAN_BIG;
502 int target_byte_order_auto = 1;
504 static const char endian_big[] = "big";
505 static const char endian_little[] = "little";
506 static const char endian_auto[] = "auto";
507 static const char *endian_enum[] =
514 static const char *set_endian_string;
516 /* Called by ``show endian''. */
519 show_endian (char *args, int from_tty)
521 if (TARGET_BYTE_ORDER_AUTO)
522 printf_unfiltered ("The target endianness is set automatically (currently %s endian)\n",
523 (TARGET_BYTE_ORDER == BFD_ENDIAN_BIG ? "big" : "little"));
525 printf_unfiltered ("The target is assumed to be %s endian\n",
526 (TARGET_BYTE_ORDER == BFD_ENDIAN_BIG ? "big" : "little"));
530 set_endian (char *ignore_args, int from_tty, struct cmd_list_element *c)
532 if (set_endian_string == endian_auto)
534 target_byte_order_auto = 1;
536 else if (set_endian_string == endian_little)
538 target_byte_order_auto = 0;
541 struct gdbarch_info info;
542 gdbarch_info_init (&info);
543 info.byte_order = BFD_ENDIAN_LITTLE;
544 if (! gdbarch_update_p (info))
546 printf_unfiltered ("Little endian target not supported by GDB\n");
551 target_byte_order = BFD_ENDIAN_LITTLE;
554 else if (set_endian_string == endian_big)
556 target_byte_order_auto = 0;
559 struct gdbarch_info info;
560 gdbarch_info_init (&info);
561 info.byte_order = BFD_ENDIAN_BIG;
562 if (! gdbarch_update_p (info))
564 printf_unfiltered ("Big endian target not supported by GDB\n");
569 target_byte_order = BFD_ENDIAN_BIG;
573 internal_error (__FILE__, __LINE__,
574 "set_endian: bad value");
575 show_endian (NULL, from_tty);
578 /* Set the endianness from a BFD. */
581 set_endian_from_file (bfd *abfd)
585 internal_error (__FILE__, __LINE__,
586 "set_endian_from_file: not for multi-arch");
587 if (bfd_big_endian (abfd))
588 want = BFD_ENDIAN_BIG;
590 want = BFD_ENDIAN_LITTLE;
591 if (TARGET_BYTE_ORDER_AUTO)
592 target_byte_order = want;
593 else if (TARGET_BYTE_ORDER != want)
594 warning ("%s endian file does not match %s endian target.",
595 want == BFD_ENDIAN_BIG ? "big" : "little",
596 TARGET_BYTE_ORDER == BFD_ENDIAN_BIG ? "big" : "little");
600 /* Functions to manipulate the architecture of the target */
602 enum set_arch { set_arch_auto, set_arch_manual };
604 int target_architecture_auto = 1;
606 const char *set_architecture_string;
608 /* Old way of changing the current architecture. */
610 extern const struct bfd_arch_info bfd_default_arch_struct;
611 const struct bfd_arch_info *target_architecture = &bfd_default_arch_struct;
612 int (*target_architecture_hook) (const struct bfd_arch_info *ap);
615 arch_ok (const struct bfd_arch_info *arch)
618 internal_error (__FILE__, __LINE__,
619 "arch_ok: not multi-arched");
620 /* Should be performing the more basic check that the binary is
621 compatible with GDB. */
622 /* Check with the target that the architecture is valid. */
623 return (target_architecture_hook == NULL
624 || target_architecture_hook (arch));
628 set_arch (const struct bfd_arch_info *arch,
632 internal_error (__FILE__, __LINE__,
633 "set_arch: not multi-arched");
638 warning ("Target may not support %s architecture",
639 arch->printable_name);
640 target_architecture = arch;
642 case set_arch_manual:
645 printf_unfiltered ("Target does not support `%s' architecture.\n",
646 arch->printable_name);
650 target_architecture_auto = 0;
651 target_architecture = arch;
656 gdbarch_dump (current_gdbarch, gdb_stdlog);
659 /* Set the architecture from arch/machine (deprecated) */
662 set_architecture_from_arch_mach (enum bfd_architecture arch,
665 const struct bfd_arch_info *wanted = bfd_lookup_arch (arch, mach);
667 internal_error (__FILE__, __LINE__,
668 "set_architecture_from_arch_mach: not multi-arched");
670 set_arch (wanted, set_arch_manual);
672 internal_error (__FILE__, __LINE__,
673 "gdbarch: hardwired architecture/machine not recognized");
676 /* Set the architecture from a BFD (deprecated) */
679 set_architecture_from_file (bfd *abfd)
681 const struct bfd_arch_info *wanted = bfd_get_arch_info (abfd);
683 internal_error (__FILE__, __LINE__,
684 "set_architecture_from_file: not multi-arched");
685 if (target_architecture_auto)
687 set_arch (wanted, set_arch_auto);
689 else if (wanted != target_architecture)
691 warning ("%s architecture file may be incompatible with %s target.",
692 wanted->printable_name,
693 target_architecture->printable_name);
698 /* Called if the user enters ``show architecture'' without an
702 show_architecture (char *args, int from_tty)
705 arch = TARGET_ARCHITECTURE->printable_name;
706 if (target_architecture_auto)
707 printf_filtered ("The target architecture is set automatically (currently %s)\n", arch);
709 printf_filtered ("The target architecture is assumed to be %s\n", arch);
713 /* Called if the user enters ``set architecture'' with or without an
717 set_architecture (char *ignore_args, int from_tty, struct cmd_list_element *c)
719 if (strcmp (set_architecture_string, "auto") == 0)
721 target_architecture_auto = 1;
723 else if (GDB_MULTI_ARCH)
725 struct gdbarch_info info;
726 gdbarch_info_init (&info);
727 info.bfd_arch_info = bfd_scan_arch (set_architecture_string);
728 if (info.bfd_arch_info == NULL)
729 internal_error (__FILE__, __LINE__,
730 "set_architecture: bfd_scan_arch failed");
731 if (gdbarch_update_p (info))
732 target_architecture_auto = 0;
734 printf_unfiltered ("Architecture `%s' not recognized.\n",
735 set_architecture_string);
739 const struct bfd_arch_info *arch
740 = bfd_scan_arch (set_architecture_string);
742 internal_error (__FILE__, __LINE__,
743 "set_architecture: bfd_scan_arch failed");
744 set_arch (arch, set_arch_manual);
746 show_architecture (NULL, from_tty);
749 /* Set the dynamic target-system-dependent parameters (architecture,
750 byte-order) using information found in the BFD */
753 set_gdbarch_from_file (bfd *abfd)
757 struct gdbarch_info info;
758 gdbarch_info_init (&info);
760 if (! gdbarch_update_p (info))
761 error ("Architecture of file not recognized.\n");
765 set_architecture_from_file (abfd);
766 set_endian_from_file (abfd);
770 /* Initialize the current architecture. Update the ``set
771 architecture'' command so that it specifies a list of valid
774 #ifdef DEFAULT_BFD_ARCH
775 extern const bfd_arch_info_type DEFAULT_BFD_ARCH;
776 static const bfd_arch_info_type *default_bfd_arch = &DEFAULT_BFD_ARCH;
778 static const bfd_arch_info_type *default_bfd_arch;
781 #ifdef DEFAULT_BFD_VEC
782 extern const bfd_target DEFAULT_BFD_VEC;
783 static const bfd_target *default_bfd_vec = &DEFAULT_BFD_VEC;
785 static const bfd_target *default_bfd_vec;
789 initialize_current_architecture (void)
791 const char **arches = gdbarch_printable_names ();
793 /* determine a default architecture and byte order. */
794 struct gdbarch_info info;
795 gdbarch_info_init (&info);
797 /* Find a default architecture. */
798 if (info.bfd_arch_info == NULL
799 && default_bfd_arch != NULL)
800 info.bfd_arch_info = default_bfd_arch;
801 if (info.bfd_arch_info == NULL)
803 /* Choose the architecture by taking the first one
805 const char *chosen = arches[0];
807 for (arch = arches; *arch != NULL; arch++)
809 if (strcmp (*arch, chosen) < 0)
813 internal_error (__FILE__, __LINE__,
814 "initialize_current_architecture: No arch");
815 info.bfd_arch_info = bfd_scan_arch (chosen);
816 if (info.bfd_arch_info == NULL)
817 internal_error (__FILE__, __LINE__,
818 "initialize_current_architecture: Arch not found");
821 /* Take several guesses at a byte order. */
822 if (info.byte_order == BFD_ENDIAN_UNKNOWN
823 && default_bfd_vec != NULL)
825 /* Extract BFD's default vector's byte order. */
826 switch (default_bfd_vec->byteorder)
829 info.byte_order = BFD_ENDIAN_BIG;
831 case BFD_ENDIAN_LITTLE:
832 info.byte_order = BFD_ENDIAN_LITTLE;
838 if (info.byte_order == BFD_ENDIAN_UNKNOWN)
840 /* look for ``*el-*'' in the target name. */
842 chp = strchr (target_name, '-');
844 && chp - 2 >= target_name
845 && strncmp (chp - 2, "el", 2) == 0)
846 info.byte_order = BFD_ENDIAN_LITTLE;
848 if (info.byte_order == BFD_ENDIAN_UNKNOWN)
850 /* Wire it to big-endian!!! */
851 info.byte_order = BFD_ENDIAN_BIG;
856 if (! gdbarch_update_p (info))
858 internal_error (__FILE__, __LINE__,
859 "initialize_current_architecture: Selection of initial architecture failed");
864 /* If the multi-arch logic comes up with a byte-order (from BFD)
865 use it for the non-multi-arch case. */
866 if (info.byte_order != BFD_ENDIAN_UNKNOWN)
867 target_byte_order = info.byte_order;
868 initialize_non_multiarch ();
871 /* Create the ``set architecture'' command appending ``auto'' to the
872 list of architectures. */
874 struct cmd_list_element *c;
875 /* Append ``auto''. */
877 for (nr = 0; arches[nr] != NULL; nr++);
878 arches = xrealloc (arches, sizeof (char*) * (nr + 2));
879 arches[nr + 0] = "auto";
880 arches[nr + 1] = NULL;
881 /* FIXME: add_set_enum_cmd() uses an array of ``char *'' instead
882 of ``const char *''. We just happen to know that the casts are
884 c = add_set_enum_cmd ("architecture", class_support,
885 arches, &set_architecture_string,
886 "Set architecture of target.",
888 set_cmd_sfunc (c, set_architecture);
889 add_alias_cmd ("processor", "architecture", class_support, 1, &setlist);
890 /* Don't use set_from_show - need to print both auto/manual and
892 add_cmd ("architecture", class_support, show_architecture,
893 "Show the current target architecture", &showlist);
898 /* Initialize a gdbarch info to values that will be automatically
899 overridden. Note: Originally, this ``struct info'' was initialized
900 using memset(0). Unfortunatly, that ran into problems, namely
901 BFD_ENDIAN_BIG is zero. An explicit initialization function that
902 can explicitly set each field to a well defined value is used. */
905 gdbarch_info_init (struct gdbarch_info *info)
907 memset (info, 0, sizeof (struct gdbarch_info));
908 info->byte_order = BFD_ENDIAN_UNKNOWN;
913 extern initialize_file_ftype _initialize_gdbarch_utils;
916 _initialize_gdbarch_utils (void)
918 struct cmd_list_element *c;
919 c = add_set_enum_cmd ("endian", class_support,
920 endian_enum, &set_endian_string,
921 "Set endianness of target.",
923 set_cmd_sfunc (c, set_endian);
924 /* Don't use set_from_show - need to print both auto/manual and
926 add_cmd ("endian", class_support, show_endian,
927 "Show the current byte-order", &showlist);