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 /* Functions to manipulate the endianness of the target. */
244 #ifdef TARGET_BYTE_ORDER_SELECTABLE
245 /* compat - Catch old targets that expect a selectable byte-order to
246 default to BIG_ENDIAN */
247 #ifndef TARGET_BYTE_ORDER_DEFAULT
248 #define TARGET_BYTE_ORDER_DEFAULT BIG_ENDIAN
251 #if !TARGET_BYTE_ORDER_SELECTABLE_P
252 #ifndef TARGET_BYTE_ORDER_DEFAULT
253 /* compat - Catch old non byte-order selectable targets that do not
254 define TARGET_BYTE_ORDER_DEFAULT and instead expect
255 TARGET_BYTE_ORDER to be used as the default. For targets that
256 defined neither TARGET_BYTE_ORDER nor TARGET_BYTE_ORDER_DEFAULT the
257 below will get a strange compiler warning. */
258 #define TARGET_BYTE_ORDER_DEFAULT TARGET_BYTE_ORDER
261 #ifndef TARGET_BYTE_ORDER_DEFAULT
262 #define TARGET_BYTE_ORDER_DEFAULT BIG_ENDIAN /* arbitrary */
264 /* ``target_byte_order'' is only used when non- multi-arch.
265 Multi-arch targets obtain the current byte order using
266 TARGET_BYTE_ORDER which is controlled by gdbarch.*. */
267 int target_byte_order = TARGET_BYTE_ORDER_DEFAULT;
268 int target_byte_order_auto = 1;
270 static const char endian_big[] = "big";
271 static const char endian_little[] = "little";
272 static const char endian_auto[] = "auto";
273 static const char *endian_enum[] =
280 static const char *set_endian_string;
282 /* Called by ``show endian''. */
285 show_endian (char *args, int from_tty)
287 if (TARGET_BYTE_ORDER_AUTO)
288 printf_unfiltered ("The target endianness is set automatically (currently %s endian)\n",
289 (TARGET_BYTE_ORDER == BIG_ENDIAN ? "big" : "little"));
291 printf_unfiltered ("The target is assumed to be %s endian\n",
292 (TARGET_BYTE_ORDER == BIG_ENDIAN ? "big" : "little"));
296 set_endian (char *ignore_args, int from_tty, struct cmd_list_element *c)
298 if (!TARGET_BYTE_ORDER_SELECTABLE_P)
300 printf_unfiltered ("Byte order is not selectable.");
302 else if (set_endian_string == endian_auto)
304 target_byte_order_auto = 1;
306 else if (set_endian_string == endian_little)
308 target_byte_order_auto = 0;
311 struct gdbarch_info info;
312 memset (&info, 0, sizeof info);
313 info.byte_order = LITTLE_ENDIAN;
314 if (! gdbarch_update_p (info))
316 printf_unfiltered ("Little endian target not supported by GDB\n");
321 target_byte_order = LITTLE_ENDIAN;
324 else if (set_endian_string == endian_big)
326 target_byte_order_auto = 0;
329 struct gdbarch_info info;
330 memset (&info, 0, sizeof info);
331 info.byte_order = BIG_ENDIAN;
332 if (! gdbarch_update_p (info))
334 printf_unfiltered ("Big endian target not supported by GDB\n");
339 target_byte_order = BIG_ENDIAN;
343 internal_error ("set_endian: bad value");
344 show_endian (NULL, from_tty);
347 /* Set the endianness from a BFD. */
350 set_endian_from_file (bfd *abfd)
353 internal_error ("set_endian_from_file: not for multi-arch");
354 if (TARGET_BYTE_ORDER_SELECTABLE_P)
358 if (bfd_big_endian (abfd))
361 want = LITTLE_ENDIAN;
362 if (TARGET_BYTE_ORDER_AUTO)
363 target_byte_order = want;
364 else if (TARGET_BYTE_ORDER != want)
365 warning ("%s endian file does not match %s endian target.",
366 want == BIG_ENDIAN ? "big" : "little",
367 TARGET_BYTE_ORDER == BIG_ENDIAN ? "big" : "little");
371 if (bfd_big_endian (abfd)
372 ? TARGET_BYTE_ORDER != BIG_ENDIAN
373 : TARGET_BYTE_ORDER == BIG_ENDIAN)
374 warning ("%s endian file does not match %s endian target.",
375 bfd_big_endian (abfd) ? "big" : "little",
376 TARGET_BYTE_ORDER == BIG_ENDIAN ? "big" : "little");
381 /* Functions to manipulate the architecture of the target */
383 enum set_arch { set_arch_auto, set_arch_manual };
385 int target_architecture_auto = 1;
387 const char *set_architecture_string;
389 /* Old way of changing the current architecture. */
391 extern const struct bfd_arch_info bfd_default_arch_struct;
392 const struct bfd_arch_info *target_architecture = &bfd_default_arch_struct;
393 int (*target_architecture_hook) (const struct bfd_arch_info *ap);
396 arch_ok (const struct bfd_arch_info *arch)
399 internal_error ("arch_ok: not multi-arched");
400 /* Should be performing the more basic check that the binary is
401 compatible with GDB. */
402 /* Check with the target that the architecture is valid. */
403 return (target_architecture_hook == NULL
404 || target_architecture_hook (arch));
408 set_arch (const struct bfd_arch_info *arch,
412 internal_error ("set_arch: not multi-arched");
417 warning ("Target may not support %s architecture",
418 arch->printable_name);
419 target_architecture = arch;
421 case set_arch_manual:
424 printf_unfiltered ("Target does not support `%s' architecture.\n",
425 arch->printable_name);
429 target_architecture_auto = 0;
430 target_architecture = arch;
435 gdbarch_dump (current_gdbarch, gdb_stdlog);
438 /* Set the architecture from arch/machine (deprecated) */
441 set_architecture_from_arch_mach (enum bfd_architecture arch,
444 const struct bfd_arch_info *wanted = bfd_lookup_arch (arch, mach);
446 internal_error ("set_architecture_from_arch_mach: not multi-arched");
448 set_arch (wanted, set_arch_manual);
450 internal_error ("gdbarch: hardwired architecture/machine not recognized");
453 /* Set the architecture from a BFD (deprecated) */
456 set_architecture_from_file (bfd *abfd)
458 const struct bfd_arch_info *wanted = bfd_get_arch_info (abfd);
460 internal_error ("set_architecture_from_file: not multi-arched");
461 if (target_architecture_auto)
463 set_arch (wanted, set_arch_auto);
465 else if (wanted != target_architecture)
467 warning ("%s architecture file may be incompatible with %s target.",
468 wanted->printable_name,
469 target_architecture->printable_name);
474 /* Called if the user enters ``show architecture'' without an
478 show_architecture (char *args, int from_tty)
481 arch = TARGET_ARCHITECTURE->printable_name;
482 if (target_architecture_auto)
483 printf_filtered ("The target architecture is set automatically (currently %s)\n", arch);
485 printf_filtered ("The target architecture is assumed to be %s\n", arch);
489 /* Called if the user enters ``set architecture'' with or without an
493 set_architecture (char *ignore_args, int from_tty, struct cmd_list_element *c)
495 if (strcmp (set_architecture_string, "auto") == 0)
497 target_architecture_auto = 1;
499 else if (GDB_MULTI_ARCH)
501 struct gdbarch_info info;
502 memset (&info, 0, sizeof info);
503 info.bfd_arch_info = bfd_scan_arch (set_architecture_string);
504 if (info.bfd_arch_info == NULL)
505 internal_error ("set_architecture: bfd_scan_arch failed");
506 if (gdbarch_update_p (info))
507 target_architecture_auto = 0;
509 printf_unfiltered ("Architecture `%s' not recognized.\n",
510 set_architecture_string);
514 const struct bfd_arch_info *arch
515 = bfd_scan_arch (set_architecture_string);
517 internal_error ("set_architecture: bfd_scan_arch failed");
518 set_arch (arch, set_arch_manual);
520 show_architecture (NULL, from_tty);
523 /* Called if the user enters ``info architecture'' without an argument. */
526 info_architecture (char *args, int from_tty)
528 printf_filtered ("Available architectures are:\n");
531 const char **arches = gdbarch_printable_names ();
533 for (arch = arches; *arch != NULL; arch++)
535 printf_filtered (" %s", *arch);
541 enum bfd_architecture a;
542 for (a = bfd_arch_obscure + 1; a < bfd_arch_last; a++)
544 const struct bfd_arch_info *ap;
545 for (ap = bfd_lookup_arch (a, 0);
549 printf_filtered (" %s", ap->printable_name);
554 printf_filtered ("\n");
557 /* Set the dynamic target-system-dependent parameters (architecture,
558 byte-order) using information found in the BFD */
561 set_gdbarch_from_file (bfd *abfd)
565 struct gdbarch_info info;
566 memset (&info, 0, sizeof info);
568 if (! gdbarch_update_p (info))
569 error ("Architecture of file not recognized.\n");
573 set_architecture_from_file (abfd);
574 set_endian_from_file (abfd);
578 /* Initialize the current architecture. Update the ``set
579 architecture'' command so that it specifies a list of valid
582 #ifdef DEFAULT_BFD_ARCH
583 extern const bfd_arch_info_type DEFAULT_BFD_ARCH;
584 static const bfd_arch_info_type *default_bfd_arch = &DEFAULT_BFD_ARCH;
586 static const bfd_arch_info_type *default_bfd_arch;
589 #ifdef DEFAULT_BFD_VEC
590 extern const bfd_target DEFAULT_BFD_VEC;
591 static const bfd_target *default_bfd_vec = &DEFAULT_BFD_VEC;
593 static const bfd_target *default_bfd_vec;
597 initialize_current_architecture (void)
599 const char **arches = gdbarch_printable_names ();
601 /* determine a default architecture and byte order. */
602 struct gdbarch_info info;
603 memset (&info, 0, sizeof (info));
605 /* Find a default architecture. */
606 if (info.bfd_arch_info == NULL
607 && default_bfd_arch != NULL)
608 info.bfd_arch_info = default_bfd_arch;
609 if (info.bfd_arch_info == NULL)
611 /* Choose the architecture by taking the first one
613 const char *chosen = arches[0];
615 for (arch = arches; *arch != NULL; arch++)
617 if (strcmp (*arch, chosen) < 0)
621 internal_error ("initialize_current_architecture: No arch");
622 info.bfd_arch_info = bfd_scan_arch (chosen);
623 if (info.bfd_arch_info == NULL)
624 internal_error ("initialize_current_architecture: Arch not found");
627 /* take several guesses at a byte order. */
628 /* NB: can't use TARGET_BYTE_ORDER_DEFAULT as its definition is
630 if (info.byte_order == 0
631 && default_bfd_vec != NULL)
633 /* Extract BFD's default vector's byte order. */
634 switch (default_bfd_vec->byteorder)
637 info.byte_order = BIG_ENDIAN;
639 case BFD_ENDIAN_LITTLE:
640 info.byte_order = LITTLE_ENDIAN;
646 if (info.byte_order == 0)
648 /* look for ``*el-*'' in the target name. */
650 chp = strchr (target_name, '-');
652 && chp - 2 >= target_name
653 && strncmp (chp - 2, "el", 2) == 0)
654 info.byte_order = LITTLE_ENDIAN;
656 if (info.byte_order == 0)
658 /* Wire it to big-endian!!! */
659 info.byte_order = BIG_ENDIAN;
664 if (! gdbarch_update_p (info))
666 internal_error ("initialize_current_architecture: Selection of initial architecture failed");
670 /* Create the ``set architecture'' command appending ``auto'' to the
671 list of architectures. */
673 struct cmd_list_element *c;
674 /* Append ``auto''. */
676 for (nr = 0; arches[nr] != NULL; nr++);
677 arches = xrealloc (arches, sizeof (char*) * (nr + 2));
678 arches[nr + 0] = "auto";
679 arches[nr + 1] = NULL;
680 /* FIXME: add_set_enum_cmd() uses an array of ``char *'' instead
681 of ``const char *''. We just happen to know that the casts are
683 c = add_set_enum_cmd ("architecture", class_support,
684 arches, &set_architecture_string,
685 "Set architecture of target.",
687 c->function.sfunc = set_architecture;
688 add_alias_cmd ("processor", "architecture", class_support, 1, &setlist);
689 /* Don't use set_from_show - need to print both auto/manual and
691 add_cmd ("architecture", class_support, show_architecture,
692 "Show the current target architecture", &showlist);
693 c = add_cmd ("architecture", class_support, info_architecture,
694 "List supported target architectures", &infolist);
695 deprecate_cmd (c, "set architecture");
702 extern initialize_file_ftype _initialize_gdbarch_utils;
705 _initialize_gdbarch_utils (void)
707 struct cmd_list_element *c;
708 c = add_set_enum_cmd ("endian", class_support,
709 endian_enum, &set_endian_string,
710 "Set endianness of target.",
712 c->function.sfunc = set_endian;
713 /* Don't use set_from_show - need to print both auto/manual and
715 add_cmd ("endian", class_support, show_endian,
716 "Show the current byte-order", &showlist);