1 /* Dynamic architecture support for GDB, the GNU debugger.
2 Copyright 1998-1999, Free Software Foundation, Inc.
4 This file is part of GDB.
6 This program is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 2 of the License, or
9 (at your option) any later version.
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with this program; if not, write to the Free Software
18 Foundation, Inc., 59 Temple Place - Suite 330,
19 Boston, MA 02111-1307, USA. */
25 #include "inferior.h" /* enum CALL_DUMMY_LOCATION et.al. */
27 /* Just include everything in sight so that the every old definition
28 of macro is visible. */
29 #include "gdb_string.h"
34 #include "breakpoint.h"
39 #include "gdbthread.h"
41 #include "symfile.h" /* for overlay functions */
46 #include "floatformat.h"
48 /* Convenience macro for allocting typesafe memory. */
51 #define XMALLOC(TYPE) (TYPE*) xmalloc (sizeof (TYPE))
55 /* Use the program counter to determine the contents and size
56 of a breakpoint instruction. If no target-dependent macro
57 BREAKPOINT_FROM_PC has been defined to implement this function,
58 assume that the breakpoint doesn't depend on the PC, and
59 use the values of the BIG_BREAKPOINT and LITTLE_BREAKPOINT macros.
60 Return a pointer to a string of bytes that encode a breakpoint
61 instruction, stores the length of the string to *lenptr,
62 and optionally adjust the pc to point to the correct memory location
63 for inserting the breakpoint. */
66 legacy_breakpoint_from_pc (CORE_ADDR * pcptr, int *lenptr)
68 /* {BIG_,LITTLE_}BREAKPOINT is the sequence of bytes we insert for a
69 breakpoint. On some machines, breakpoints are handled by the
70 target environment and we don't have to worry about them here. */
72 if (TARGET_BYTE_ORDER == BIG_ENDIAN)
74 static unsigned char big_break_insn[] = BIG_BREAKPOINT;
75 *lenptr = sizeof (big_break_insn);
76 return big_break_insn;
79 #ifdef LITTLE_BREAKPOINT
80 if (TARGET_BYTE_ORDER != BIG_ENDIAN)
82 static unsigned char little_break_insn[] = LITTLE_BREAKPOINT;
83 *lenptr = sizeof (little_break_insn);
84 return little_break_insn;
89 static unsigned char break_insn[] = BREAKPOINT;
90 *lenptr = sizeof (break_insn);
99 generic_frameless_function_invocation_not (struct frame_info *fi)
105 generic_return_value_on_stack_not (struct type *type)
111 legacy_register_name (int i)
113 #ifdef REGISTER_NAMES
114 static char *names[] = REGISTER_NAMES;
115 if (i < 0 || i >= (sizeof (names) / sizeof (*names)))
120 internal_error ("legacy_register_name: called.");
125 #if defined (CALL_DUMMY)
126 LONGEST legacy_call_dummy_words[] = CALL_DUMMY;
128 LONGEST legacy_call_dummy_words[1];
130 int legacy_sizeof_call_dummy_words = sizeof (legacy_call_dummy_words);
133 generic_remote_translate_xfer_address (CORE_ADDR gdb_addr, int gdb_len,
134 CORE_ADDR * rem_addr, int *rem_len)
136 *rem_addr = gdb_addr;
141 generic_prologue_frameless_p (CORE_ADDR ip)
143 #ifdef SKIP_PROLOGUE_FRAMELESS_P
144 return ip == SKIP_PROLOGUE_FRAMELESS_P (ip);
146 return ip == SKIP_PROLOGUE (ip);
151 /* Helper functions for INNER_THAN */
154 core_addr_lessthan (CORE_ADDR lhs, CORE_ADDR rhs)
160 core_addr_greaterthan (CORE_ADDR lhs, CORE_ADDR rhs)
166 /* Helper functions for TARGET_{FLOAT,DOUBLE}_FORMAT */
168 const struct floatformat *
169 default_float_format (struct gdbarch *gdbarch)
172 int byte_order = gdbarch_byte_order (gdbarch);
174 int byte_order = TARGET_BYTE_ORDER;
179 return &floatformat_ieee_single_big;
181 return &floatformat_ieee_single_little;
183 internal_error ("default_float_format: bad byte order");
188 const struct floatformat *
189 default_double_format (struct gdbarch *gdbarch)
192 int byte_order = gdbarch_byte_order (gdbarch);
194 int byte_order = TARGET_BYTE_ORDER;
199 return &floatformat_ieee_double_big;
201 return &floatformat_ieee_double_little;
203 internal_error ("default_double_format: bad byte order");
207 /* Misc helper functions for targets. */
210 frame_num_args_unknown (struct frame_info *fi)
217 generic_register_convertible_not (int num)
224 default_register_sim_regno (int num)
231 default_convert_from_func_ptr_addr (CORE_ADDR addr)
237 no_op_reg_to_regnum (int reg)
242 /* For use by frame_args_address and frame_locals_address. */
244 default_frame_address (struct frame_info *fi)
249 /* Functions to manipulate the endianness of the target. */
251 #ifdef TARGET_BYTE_ORDER_SELECTABLE
252 /* compat - Catch old targets that expect a selectable byte-order to
253 default to BIG_ENDIAN */
254 #ifndef TARGET_BYTE_ORDER_DEFAULT
255 #define TARGET_BYTE_ORDER_DEFAULT BIG_ENDIAN
258 #if !TARGET_BYTE_ORDER_SELECTABLE_P
259 #ifndef TARGET_BYTE_ORDER_DEFAULT
260 /* compat - Catch old non byte-order selectable targets that do not
261 define TARGET_BYTE_ORDER_DEFAULT and instead expect
262 TARGET_BYTE_ORDER to be used as the default. For targets that
263 defined neither TARGET_BYTE_ORDER nor TARGET_BYTE_ORDER_DEFAULT the
264 below will get a strange compiler warning. */
265 #define TARGET_BYTE_ORDER_DEFAULT TARGET_BYTE_ORDER
268 #ifndef TARGET_BYTE_ORDER_DEFAULT
269 #define TARGET_BYTE_ORDER_DEFAULT BIG_ENDIAN /* arbitrary */
271 /* ``target_byte_order'' is only used when non- multi-arch.
272 Multi-arch targets obtain the current byte order using
273 TARGET_BYTE_ORDER which is controlled by gdbarch.*. */
274 int target_byte_order = TARGET_BYTE_ORDER_DEFAULT;
275 int target_byte_order_auto = 1;
277 static const char endian_big[] = "big";
278 static const char endian_little[] = "little";
279 static const char endian_auto[] = "auto";
280 static const char *endian_enum[] =
287 static const char *set_endian_string;
289 /* Called by ``show endian''. */
292 show_endian (char *args, int from_tty)
294 if (TARGET_BYTE_ORDER_AUTO)
295 printf_unfiltered ("The target endianness is set automatically (currently %s endian)\n",
296 (TARGET_BYTE_ORDER == BIG_ENDIAN ? "big" : "little"));
298 printf_unfiltered ("The target is assumed to be %s endian\n",
299 (TARGET_BYTE_ORDER == BIG_ENDIAN ? "big" : "little"));
303 set_endian (char *ignore_args, int from_tty, struct cmd_list_element *c)
305 if (!TARGET_BYTE_ORDER_SELECTABLE_P)
307 printf_unfiltered ("Byte order is not selectable.");
309 else if (set_endian_string == endian_auto)
311 target_byte_order_auto = 1;
313 else if (set_endian_string == endian_little)
315 target_byte_order_auto = 0;
318 struct gdbarch_info info;
319 memset (&info, 0, sizeof info);
320 info.byte_order = LITTLE_ENDIAN;
321 if (! gdbarch_update_p (info))
323 printf_unfiltered ("Little endian target not supported by GDB\n");
328 target_byte_order = LITTLE_ENDIAN;
331 else if (set_endian_string == endian_big)
333 target_byte_order_auto = 0;
336 struct gdbarch_info info;
337 memset (&info, 0, sizeof info);
338 info.byte_order = BIG_ENDIAN;
339 if (! gdbarch_update_p (info))
341 printf_unfiltered ("Big endian target not supported by GDB\n");
346 target_byte_order = BIG_ENDIAN;
350 internal_error ("set_endian: bad value");
351 show_endian (NULL, from_tty);
354 /* Set the endianness from a BFD. */
357 set_endian_from_file (bfd *abfd)
360 internal_error ("set_endian_from_file: not for multi-arch");
361 if (TARGET_BYTE_ORDER_SELECTABLE_P)
365 if (bfd_big_endian (abfd))
368 want = LITTLE_ENDIAN;
369 if (TARGET_BYTE_ORDER_AUTO)
370 target_byte_order = want;
371 else if (TARGET_BYTE_ORDER != want)
372 warning ("%s endian file does not match %s endian target.",
373 want == BIG_ENDIAN ? "big" : "little",
374 TARGET_BYTE_ORDER == BIG_ENDIAN ? "big" : "little");
378 if (bfd_big_endian (abfd)
379 ? TARGET_BYTE_ORDER != BIG_ENDIAN
380 : TARGET_BYTE_ORDER == BIG_ENDIAN)
381 warning ("%s endian file does not match %s endian target.",
382 bfd_big_endian (abfd) ? "big" : "little",
383 TARGET_BYTE_ORDER == BIG_ENDIAN ? "big" : "little");
388 /* Functions to manipulate the architecture of the target */
390 enum set_arch { set_arch_auto, set_arch_manual };
392 int target_architecture_auto = 1;
394 const char *set_architecture_string;
396 /* Old way of changing the current architecture. */
398 extern const struct bfd_arch_info bfd_default_arch_struct;
399 const struct bfd_arch_info *target_architecture = &bfd_default_arch_struct;
400 int (*target_architecture_hook) (const struct bfd_arch_info *ap);
403 arch_ok (const struct bfd_arch_info *arch)
406 internal_error ("arch_ok: not multi-arched");
407 /* Should be performing the more basic check that the binary is
408 compatible with GDB. */
409 /* Check with the target that the architecture is valid. */
410 return (target_architecture_hook == NULL
411 || target_architecture_hook (arch));
415 set_arch (const struct bfd_arch_info *arch,
419 internal_error ("set_arch: not multi-arched");
424 warning ("Target may not support %s architecture",
425 arch->printable_name);
426 target_architecture = arch;
428 case set_arch_manual:
431 printf_unfiltered ("Target does not support `%s' architecture.\n",
432 arch->printable_name);
436 target_architecture_auto = 0;
437 target_architecture = arch;
442 gdbarch_dump (current_gdbarch, gdb_stdlog);
445 /* Set the architecture from arch/machine (deprecated) */
448 set_architecture_from_arch_mach (enum bfd_architecture arch,
451 const struct bfd_arch_info *wanted = bfd_lookup_arch (arch, mach);
453 internal_error ("set_architecture_from_arch_mach: not multi-arched");
455 set_arch (wanted, set_arch_manual);
457 internal_error ("gdbarch: hardwired architecture/machine not recognized");
460 /* Set the architecture from a BFD (deprecated) */
463 set_architecture_from_file (bfd *abfd)
465 const struct bfd_arch_info *wanted = bfd_get_arch_info (abfd);
467 internal_error ("set_architecture_from_file: not multi-arched");
468 if (target_architecture_auto)
470 set_arch (wanted, set_arch_auto);
472 else if (wanted != target_architecture)
474 warning ("%s architecture file may be incompatible with %s target.",
475 wanted->printable_name,
476 target_architecture->printable_name);
481 /* Called if the user enters ``show architecture'' without an
485 show_architecture (char *args, int from_tty)
488 arch = TARGET_ARCHITECTURE->printable_name;
489 if (target_architecture_auto)
490 printf_filtered ("The target architecture is set automatically (currently %s)\n", arch);
492 printf_filtered ("The target architecture is assumed to be %s\n", arch);
496 /* Called if the user enters ``set architecture'' with or without an
500 set_architecture (char *ignore_args, int from_tty, struct cmd_list_element *c)
502 if (strcmp (set_architecture_string, "auto") == 0)
504 target_architecture_auto = 1;
506 else if (GDB_MULTI_ARCH)
508 struct gdbarch_info info;
509 memset (&info, 0, sizeof info);
510 info.bfd_arch_info = bfd_scan_arch (set_architecture_string);
511 if (info.bfd_arch_info == NULL)
512 internal_error ("set_architecture: bfd_scan_arch failed");
513 if (gdbarch_update_p (info))
514 target_architecture_auto = 0;
516 printf_unfiltered ("Architecture `%s' not recognized.\n",
517 set_architecture_string);
521 const struct bfd_arch_info *arch
522 = bfd_scan_arch (set_architecture_string);
524 internal_error ("set_architecture: bfd_scan_arch failed");
525 set_arch (arch, set_arch_manual);
527 show_architecture (NULL, from_tty);
530 /* Called if the user enters ``info architecture'' without an argument. */
533 info_architecture (char *args, int from_tty)
535 printf_filtered ("Available architectures are:\n");
538 const char **arches = gdbarch_printable_names ();
540 for (arch = arches; *arch != NULL; arch++)
542 printf_filtered (" %s", *arch);
548 enum bfd_architecture a;
549 for (a = bfd_arch_obscure + 1; a < bfd_arch_last; a++)
551 const struct bfd_arch_info *ap;
552 for (ap = bfd_lookup_arch (a, 0);
556 printf_filtered (" %s", ap->printable_name);
561 printf_filtered ("\n");
564 /* Set the dynamic target-system-dependent parameters (architecture,
565 byte-order) using information found in the BFD */
568 set_gdbarch_from_file (bfd *abfd)
572 struct gdbarch_info info;
573 memset (&info, 0, sizeof info);
575 if (! gdbarch_update_p (info))
576 error ("Architecture of file not recognized.\n");
580 set_architecture_from_file (abfd);
581 set_endian_from_file (abfd);
585 /* Initialize the current architecture. Update the ``set
586 architecture'' command so that it specifies a list of valid
589 #ifdef DEFAULT_BFD_ARCH
590 extern const bfd_arch_info_type DEFAULT_BFD_ARCH;
591 static const bfd_arch_info_type *default_bfd_arch = &DEFAULT_BFD_ARCH;
593 static const bfd_arch_info_type *default_bfd_arch;
596 #ifdef DEFAULT_BFD_VEC
597 extern const bfd_target DEFAULT_BFD_VEC;
598 static const bfd_target *default_bfd_vec = &DEFAULT_BFD_VEC;
600 static const bfd_target *default_bfd_vec;
604 initialize_current_architecture (void)
606 const char **arches = gdbarch_printable_names ();
608 /* determine a default architecture and byte order. */
609 struct gdbarch_info info;
610 memset (&info, 0, sizeof (info));
612 /* Find a default architecture. */
613 if (info.bfd_arch_info == NULL
614 && default_bfd_arch != NULL)
615 info.bfd_arch_info = default_bfd_arch;
616 if (info.bfd_arch_info == NULL)
618 /* Choose the architecture by taking the first one
620 const char *chosen = arches[0];
622 for (arch = arches; *arch != NULL; arch++)
624 if (strcmp (*arch, chosen) < 0)
628 internal_error ("initialize_current_architecture: No arch");
629 info.bfd_arch_info = bfd_scan_arch (chosen);
630 if (info.bfd_arch_info == NULL)
631 internal_error ("initialize_current_architecture: Arch not found");
634 /* take several guesses at a byte order. */
635 /* NB: can't use TARGET_BYTE_ORDER_DEFAULT as its definition is
637 if (info.byte_order == 0
638 && default_bfd_vec != NULL)
640 /* Extract BFD's default vector's byte order. */
641 switch (default_bfd_vec->byteorder)
644 info.byte_order = BIG_ENDIAN;
646 case BFD_ENDIAN_LITTLE:
647 info.byte_order = LITTLE_ENDIAN;
653 if (info.byte_order == 0)
655 /* look for ``*el-*'' in the target name. */
657 chp = strchr (target_name, '-');
659 && chp - 2 >= target_name
660 && strncmp (chp - 2, "el", 2) == 0)
661 info.byte_order = LITTLE_ENDIAN;
663 if (info.byte_order == 0)
665 /* Wire it to big-endian!!! */
666 info.byte_order = BIG_ENDIAN;
671 if (! gdbarch_update_p (info))
673 internal_error ("initialize_current_architecture: Selection of initial architecture failed");
677 /* Create the ``set architecture'' command appending ``auto'' to the
678 list of architectures. */
680 struct cmd_list_element *c;
681 /* Append ``auto''. */
683 for (nr = 0; arches[nr] != NULL; nr++);
684 arches = xrealloc (arches, sizeof (char*) * (nr + 2));
685 arches[nr + 0] = "auto";
686 arches[nr + 1] = NULL;
687 /* FIXME: add_set_enum_cmd() uses an array of ``char *'' instead
688 of ``const char *''. We just happen to know that the casts are
690 c = add_set_enum_cmd ("architecture", class_support,
691 arches, &set_architecture_string,
692 "Set architecture of target.",
694 c->function.sfunc = set_architecture;
695 add_alias_cmd ("processor", "architecture", class_support, 1, &setlist);
696 /* Don't use set_from_show - need to print both auto/manual and
698 add_cmd ("architecture", class_support, show_architecture,
699 "Show the current target architecture", &showlist);
700 c = add_cmd ("architecture", class_support, info_architecture,
701 "List supported target architectures", &infolist);
702 deprecate_cmd (c, "set architecture");
709 extern initialize_file_ftype _initialize_gdbarch_utils;
712 _initialize_gdbarch_utils (void)
714 struct cmd_list_element *c;
715 c = add_set_enum_cmd ("endian", class_support,
716 endian_enum, &set_endian_string,
717 "Set endianness of target.",
719 c->function.sfunc = set_endian;
720 /* Don't use set_from_show - need to print both auto/manual and
722 add_cmd ("endian", class_support, show_endian,
723 "Show the current byte-order", &showlist);