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 DEPRECATED_EXTRACT_RETURN_VALUE (type, registers, valbuf);
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_frameless_function_invocation_not (struct frame_info *fi)
127 generic_return_value_on_stack_not (struct type *type)
133 generic_skip_trampoline_code (CORE_ADDR pc)
139 generic_in_solib_call_trampoline (CORE_ADDR pc, char *name)
145 generic_in_function_epilogue_p (struct gdbarch *gdbarch, CORE_ADDR pc)
151 legacy_register_name (int i)
153 #ifdef REGISTER_NAMES
154 static char *names[] = REGISTER_NAMES;
155 if (i < 0 || i >= (sizeof (names) / sizeof (*names)))
160 internal_error (__FILE__, __LINE__,
161 "legacy_register_name: called.");
166 #if defined (CALL_DUMMY)
167 LONGEST legacy_call_dummy_words[] = CALL_DUMMY;
169 LONGEST legacy_call_dummy_words[1];
171 int legacy_sizeof_call_dummy_words = sizeof (legacy_call_dummy_words);
174 generic_remote_translate_xfer_address (CORE_ADDR gdb_addr, int gdb_len,
175 CORE_ADDR * rem_addr, int *rem_len)
177 *rem_addr = gdb_addr;
182 generic_prologue_frameless_p (CORE_ADDR ip)
184 return ip == SKIP_PROLOGUE (ip);
187 /* New/multi-arched targets should use the correct gdbarch field
188 instead of using this global pointer. */
190 legacy_print_insn (bfd_vma vma, disassemble_info *info)
192 return (*tm_print_insn) (vma, info);
195 /* Helper functions for INNER_THAN */
198 core_addr_lessthan (CORE_ADDR lhs, CORE_ADDR rhs)
204 core_addr_greaterthan (CORE_ADDR lhs, CORE_ADDR rhs)
210 /* Helper functions for TARGET_{FLOAT,DOUBLE}_FORMAT */
212 const struct floatformat *
213 default_float_format (struct gdbarch *gdbarch)
216 int byte_order = gdbarch_byte_order (gdbarch);
218 int byte_order = TARGET_BYTE_ORDER;
223 return &floatformat_ieee_single_big;
224 case BFD_ENDIAN_LITTLE:
225 return &floatformat_ieee_single_little;
227 internal_error (__FILE__, __LINE__,
228 "default_float_format: bad byte order");
233 const struct floatformat *
234 default_double_format (struct gdbarch *gdbarch)
237 int byte_order = gdbarch_byte_order (gdbarch);
239 int byte_order = TARGET_BYTE_ORDER;
244 return &floatformat_ieee_double_big;
245 case BFD_ENDIAN_LITTLE:
246 return &floatformat_ieee_double_little;
248 internal_error (__FILE__, __LINE__,
249 "default_double_format: bad byte order");
254 default_print_float_info (struct gdbarch *gdbarch, struct ui_file *file,
255 struct frame_info *frame)
258 #if GDB_MULTI_ARCH > GDB_MULTI_ARCH_PARTIAL
259 #error "FLOAT_INFO defined in multi-arch"
263 fprintf_filtered (file, "\
264 No floating point info available for this processor.\n");
268 /* Misc helper functions for targets. */
271 frame_num_args_unknown (struct frame_info *fi)
278 generic_register_convertible_not (int num)
284 /* Under some ABI's that specify the `struct convention' for returning
285 structures by value, by the time we've returned from the function,
286 the return value is sitting there in the caller's buffer, but GDB
287 has no way to find the address of that buffer.
289 On such architectures, use this function as your
290 extract_struct_value_address method. When asked to a struct
291 returned by value in this fashion, GDB will print a nice error
292 message, instead of garbage. */
294 generic_cannot_extract_struct_value_address (char *dummy)
300 core_addr_identity (CORE_ADDR addr)
306 no_op_reg_to_regnum (int reg)
311 /* For use by frame_args_address and frame_locals_address. */
313 default_frame_address (struct frame_info *fi)
318 /* Default prepare_to_procced(). */
320 default_prepare_to_proceed (int select_it)
325 /* Generic prepare_to_proceed(). This one should be suitable for most
326 targets that support threads. */
328 generic_prepare_to_proceed (int select_it)
331 struct target_waitstatus wait_status;
333 /* Get the last target status returned by target_wait(). */
334 get_last_target_status (&wait_ptid, &wait_status);
336 /* Make sure we were stopped either at a breakpoint, or because
338 if (wait_status.kind != TARGET_WAITKIND_STOPPED
339 || (wait_status.value.sig != TARGET_SIGNAL_TRAP &&
340 wait_status.value.sig != TARGET_SIGNAL_INT))
345 if (!ptid_equal (wait_ptid, minus_one_ptid)
346 && !ptid_equal (inferior_ptid, wait_ptid))
348 /* Switched over from WAIT_PID. */
349 CORE_ADDR wait_pc = read_pc_pid (wait_ptid);
351 if (wait_pc != read_pc ())
355 /* Switch back to WAIT_PID thread. */
356 inferior_ptid = wait_ptid;
358 /* FIXME: This stuff came from switch_to_thread() in
359 thread.c (which should probably be a public function). */
360 flush_cached_frames ();
361 registers_changed ();
363 select_frame (get_current_frame ());
365 /* We return 1 to indicate that there is a breakpoint here,
366 so we need to step over it before continuing to avoid
367 hitting it straight away. */
368 if (breakpoint_here_p (wait_pc))
379 init_frame_pc_noop (int fromleaf, struct frame_info *prev)
385 init_frame_pc_default (int fromleaf, struct frame_info *prev)
388 prev->pc = SAVED_PC_AFTER_CALL (prev->next);
389 else if (prev->next != NULL)
390 prev->pc = FRAME_SAVED_PC (prev->next);
392 prev->pc = read_pc ();
396 default_elf_make_msymbol_special (asymbol *sym, struct minimal_symbol *msym)
402 default_coff_make_msymbol_special (int val, struct minimal_symbol *msym)
408 cannot_register_not (int regnum)
413 /* Legacy version of target_virtual_frame_pointer(). Assumes that
414 there is an FP_REGNUM and that it is the same, cooked or raw. */
417 legacy_virtual_frame_pointer (CORE_ADDR pc,
419 LONGEST *frame_offset)
421 gdb_assert (FP_REGNUM >= 0);
422 *frame_regnum = FP_REGNUM;
426 /* Assume the world is sane, every register's virtual and real size
430 generic_register_size (int regnum)
432 gdb_assert (regnum >= 0 && regnum < NUM_REGS + NUM_PSEUDO_REGS);
433 return TYPE_LENGTH (REGISTER_VIRTUAL_TYPE (regnum));
436 #if !defined (IN_SIGTRAMP)
437 #if defined (SIGTRAMP_START)
438 #define IN_SIGTRAMP(pc, name) \
439 ((pc) >= SIGTRAMP_START(pc) \
440 && (pc) < SIGTRAMP_END(pc) \
443 #define IN_SIGTRAMP(pc, name) \
444 (name && STREQ ("_sigtramp", name))
449 legacy_pc_in_sigtramp (CORE_ADDR pc, char *name)
451 return IN_SIGTRAMP(pc, name);
455 legacy_convert_register_p (int regnum)
457 return REGISTER_CONVERTIBLE (regnum);
461 legacy_register_to_value (int regnum, struct type *type,
462 char *from, char *to)
464 REGISTER_CONVERT_TO_VIRTUAL (regnum, type, from, to);
468 legacy_value_to_register (struct type *type, int regnum,
469 char *from, char *to)
471 REGISTER_CONVERT_TO_RAW (type, regnum, from, to);
475 /* Functions to manipulate the endianness of the target. */
477 /* ``target_byte_order'' is only used when non- multi-arch.
478 Multi-arch targets obtain the current byte order using the
479 TARGET_BYTE_ORDER gdbarch method.
481 The choice of initial value is entirely arbitrary. During startup,
482 the function initialize_current_architecture() updates this value
483 based on default byte-order information extracted from BFD. */
484 int target_byte_order = BFD_ENDIAN_BIG;
485 int target_byte_order_auto = 1;
487 static const char endian_big[] = "big";
488 static const char endian_little[] = "little";
489 static const char endian_auto[] = "auto";
490 static const char *endian_enum[] =
497 static const char *set_endian_string;
499 /* Called by ``show endian''. */
502 show_endian (char *args, int from_tty)
504 if (TARGET_BYTE_ORDER_AUTO)
505 printf_unfiltered ("The target endianness is set automatically (currently %s endian)\n",
506 (TARGET_BYTE_ORDER == BFD_ENDIAN_BIG ? "big" : "little"));
508 printf_unfiltered ("The target is assumed to be %s endian\n",
509 (TARGET_BYTE_ORDER == BFD_ENDIAN_BIG ? "big" : "little"));
513 set_endian (char *ignore_args, int from_tty, struct cmd_list_element *c)
515 if (set_endian_string == endian_auto)
517 target_byte_order_auto = 1;
519 else if (set_endian_string == endian_little)
521 target_byte_order_auto = 0;
524 struct gdbarch_info info;
525 gdbarch_info_init (&info);
526 info.byte_order = BFD_ENDIAN_LITTLE;
527 if (! gdbarch_update_p (info))
529 printf_unfiltered ("Little endian target not supported by GDB\n");
534 target_byte_order = BFD_ENDIAN_LITTLE;
537 else if (set_endian_string == endian_big)
539 target_byte_order_auto = 0;
542 struct gdbarch_info info;
543 gdbarch_info_init (&info);
544 info.byte_order = BFD_ENDIAN_BIG;
545 if (! gdbarch_update_p (info))
547 printf_unfiltered ("Big endian target not supported by GDB\n");
552 target_byte_order = BFD_ENDIAN_BIG;
556 internal_error (__FILE__, __LINE__,
557 "set_endian: bad value");
558 show_endian (NULL, from_tty);
561 /* Set the endianness from a BFD. */
564 set_endian_from_file (bfd *abfd)
568 internal_error (__FILE__, __LINE__,
569 "set_endian_from_file: not for multi-arch");
570 if (bfd_big_endian (abfd))
571 want = BFD_ENDIAN_BIG;
573 want = BFD_ENDIAN_LITTLE;
574 if (TARGET_BYTE_ORDER_AUTO)
575 target_byte_order = want;
576 else if (TARGET_BYTE_ORDER != want)
577 warning ("%s endian file does not match %s endian target.",
578 want == BFD_ENDIAN_BIG ? "big" : "little",
579 TARGET_BYTE_ORDER == BFD_ENDIAN_BIG ? "big" : "little");
583 /* Functions to manipulate the architecture of the target */
585 enum set_arch { set_arch_auto, set_arch_manual };
587 int target_architecture_auto = 1;
589 const char *set_architecture_string;
591 /* Old way of changing the current architecture. */
593 extern const struct bfd_arch_info bfd_default_arch_struct;
594 const struct bfd_arch_info *target_architecture = &bfd_default_arch_struct;
595 int (*target_architecture_hook) (const struct bfd_arch_info *ap);
598 arch_ok (const struct bfd_arch_info *arch)
601 internal_error (__FILE__, __LINE__,
602 "arch_ok: not multi-arched");
603 /* Should be performing the more basic check that the binary is
604 compatible with GDB. */
605 /* Check with the target that the architecture is valid. */
606 return (target_architecture_hook == NULL
607 || target_architecture_hook (arch));
611 set_arch (const struct bfd_arch_info *arch,
615 internal_error (__FILE__, __LINE__,
616 "set_arch: not multi-arched");
621 warning ("Target may not support %s architecture",
622 arch->printable_name);
623 target_architecture = arch;
625 case set_arch_manual:
628 printf_unfiltered ("Target does not support `%s' architecture.\n",
629 arch->printable_name);
633 target_architecture_auto = 0;
634 target_architecture = arch;
639 gdbarch_dump (current_gdbarch, gdb_stdlog);
642 /* Set the architecture from arch/machine (deprecated) */
645 set_architecture_from_arch_mach (enum bfd_architecture arch,
648 const struct bfd_arch_info *wanted = bfd_lookup_arch (arch, mach);
650 internal_error (__FILE__, __LINE__,
651 "set_architecture_from_arch_mach: not multi-arched");
653 set_arch (wanted, set_arch_manual);
655 internal_error (__FILE__, __LINE__,
656 "gdbarch: hardwired architecture/machine not recognized");
659 /* Set the architecture from a BFD (deprecated) */
662 set_architecture_from_file (bfd *abfd)
664 const struct bfd_arch_info *wanted = bfd_get_arch_info (abfd);
666 internal_error (__FILE__, __LINE__,
667 "set_architecture_from_file: not multi-arched");
668 if (target_architecture_auto)
670 set_arch (wanted, set_arch_auto);
672 else if (wanted != target_architecture)
674 warning ("%s architecture file may be incompatible with %s target.",
675 wanted->printable_name,
676 target_architecture->printable_name);
681 /* Called if the user enters ``show architecture'' without an
685 show_architecture (char *args, int from_tty)
688 arch = TARGET_ARCHITECTURE->printable_name;
689 if (target_architecture_auto)
690 printf_filtered ("The target architecture is set automatically (currently %s)\n", arch);
692 printf_filtered ("The target architecture is assumed to be %s\n", arch);
696 /* Called if the user enters ``set architecture'' with or without an
700 set_architecture (char *ignore_args, int from_tty, struct cmd_list_element *c)
702 if (strcmp (set_architecture_string, "auto") == 0)
704 target_architecture_auto = 1;
706 else if (GDB_MULTI_ARCH)
708 struct gdbarch_info info;
709 gdbarch_info_init (&info);
710 info.bfd_arch_info = bfd_scan_arch (set_architecture_string);
711 if (info.bfd_arch_info == NULL)
712 internal_error (__FILE__, __LINE__,
713 "set_architecture: bfd_scan_arch failed");
714 if (gdbarch_update_p (info))
715 target_architecture_auto = 0;
717 printf_unfiltered ("Architecture `%s' not recognized.\n",
718 set_architecture_string);
722 const struct bfd_arch_info *arch
723 = bfd_scan_arch (set_architecture_string);
725 internal_error (__FILE__, __LINE__,
726 "set_architecture: bfd_scan_arch failed");
727 set_arch (arch, set_arch_manual);
729 show_architecture (NULL, from_tty);
732 /* Set the dynamic target-system-dependent parameters (architecture,
733 byte-order) using information found in the BFD */
736 set_gdbarch_from_file (bfd *abfd)
740 struct gdbarch_info info;
741 gdbarch_info_init (&info);
743 if (! gdbarch_update_p (info))
744 error ("Architecture of file not recognized.\n");
748 set_architecture_from_file (abfd);
749 set_endian_from_file (abfd);
753 /* Initialize the current architecture. Update the ``set
754 architecture'' command so that it specifies a list of valid
757 #ifdef DEFAULT_BFD_ARCH
758 extern const bfd_arch_info_type DEFAULT_BFD_ARCH;
759 static const bfd_arch_info_type *default_bfd_arch = &DEFAULT_BFD_ARCH;
761 static const bfd_arch_info_type *default_bfd_arch;
764 #ifdef DEFAULT_BFD_VEC
765 extern const bfd_target DEFAULT_BFD_VEC;
766 static const bfd_target *default_bfd_vec = &DEFAULT_BFD_VEC;
768 static const bfd_target *default_bfd_vec;
772 initialize_current_architecture (void)
774 const char **arches = gdbarch_printable_names ();
776 /* determine a default architecture and byte order. */
777 struct gdbarch_info info;
778 gdbarch_info_init (&info);
780 /* Find a default architecture. */
781 if (info.bfd_arch_info == NULL
782 && default_bfd_arch != NULL)
783 info.bfd_arch_info = default_bfd_arch;
784 if (info.bfd_arch_info == NULL)
786 /* Choose the architecture by taking the first one
788 const char *chosen = arches[0];
790 for (arch = arches; *arch != NULL; arch++)
792 if (strcmp (*arch, chosen) < 0)
796 internal_error (__FILE__, __LINE__,
797 "initialize_current_architecture: No arch");
798 info.bfd_arch_info = bfd_scan_arch (chosen);
799 if (info.bfd_arch_info == NULL)
800 internal_error (__FILE__, __LINE__,
801 "initialize_current_architecture: Arch not found");
804 /* Take several guesses at a byte order. */
805 if (info.byte_order == BFD_ENDIAN_UNKNOWN
806 && default_bfd_vec != NULL)
808 /* Extract BFD's default vector's byte order. */
809 switch (default_bfd_vec->byteorder)
812 info.byte_order = BFD_ENDIAN_BIG;
814 case BFD_ENDIAN_LITTLE:
815 info.byte_order = BFD_ENDIAN_LITTLE;
821 if (info.byte_order == BFD_ENDIAN_UNKNOWN)
823 /* look for ``*el-*'' in the target name. */
825 chp = strchr (target_name, '-');
827 && chp - 2 >= target_name
828 && strncmp (chp - 2, "el", 2) == 0)
829 info.byte_order = BFD_ENDIAN_LITTLE;
831 if (info.byte_order == BFD_ENDIAN_UNKNOWN)
833 /* Wire it to big-endian!!! */
834 info.byte_order = BFD_ENDIAN_BIG;
839 if (! gdbarch_update_p (info))
841 internal_error (__FILE__, __LINE__,
842 "initialize_current_architecture: Selection of initial architecture failed");
847 /* If the multi-arch logic comes up with a byte-order (from BFD)
848 use it for the non-multi-arch case. */
849 if (info.byte_order != BFD_ENDIAN_UNKNOWN)
850 target_byte_order = info.byte_order;
851 initialize_non_multiarch ();
854 /* Create the ``set architecture'' command appending ``auto'' to the
855 list of architectures. */
857 struct cmd_list_element *c;
858 /* Append ``auto''. */
860 for (nr = 0; arches[nr] != NULL; nr++);
861 arches = xrealloc (arches, sizeof (char*) * (nr + 2));
862 arches[nr + 0] = "auto";
863 arches[nr + 1] = NULL;
864 /* FIXME: add_set_enum_cmd() uses an array of ``char *'' instead
865 of ``const char *''. We just happen to know that the casts are
867 c = add_set_enum_cmd ("architecture", class_support,
868 arches, &set_architecture_string,
869 "Set architecture of target.",
871 set_cmd_sfunc (c, set_architecture);
872 add_alias_cmd ("processor", "architecture", class_support, 1, &setlist);
873 /* Don't use set_from_show - need to print both auto/manual and
875 add_cmd ("architecture", class_support, show_architecture,
876 "Show the current target architecture", &showlist);
881 /* Initialize a gdbarch info to values that will be automatically
882 overridden. Note: Originally, this ``struct info'' was initialized
883 using memset(0). Unfortunatly, that ran into problems, namely
884 BFD_ENDIAN_BIG is zero. An explicit initialization function that
885 can explicitly set each field to a well defined value is used. */
888 gdbarch_info_init (struct gdbarch_info *info)
890 memset (info, 0, sizeof (struct gdbarch_info));
891 info->byte_order = BFD_ENDIAN_UNKNOWN;
896 extern initialize_file_ftype _initialize_gdbarch_utils;
899 _initialize_gdbarch_utils (void)
901 struct cmd_list_element *c;
902 c = add_set_enum_cmd ("endian", class_support,
903 endian_enum, &set_endian_string,
904 "Set endianness of target.",
906 set_cmd_sfunc (c, set_endian);
907 /* Don't use set_from_show - need to print both auto/manual and
909 add_cmd ("endian", class_support, show_endian,
910 "Show the current byte-order", &showlist);