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)
236 /* Functions to manipulate the endianness of the target. */
238 #ifdef TARGET_BYTE_ORDER_SELECTABLE
239 /* compat - Catch old targets that expect a selectable byte-order to
240 default to BIG_ENDIAN */
241 #ifndef TARGET_BYTE_ORDER_DEFAULT
242 #define TARGET_BYTE_ORDER_DEFAULT BIG_ENDIAN
245 #if !TARGET_BYTE_ORDER_SELECTABLE_P
246 #ifndef TARGET_BYTE_ORDER_DEFAULT
247 /* compat - Catch old non byte-order selectable targets that do not
248 define TARGET_BYTE_ORDER_DEFAULT and instead expect
249 TARGET_BYTE_ORDER to be used as the default. For targets that
250 defined neither TARGET_BYTE_ORDER nor TARGET_BYTE_ORDER_DEFAULT the
251 below will get a strange compiler warning. */
252 #define TARGET_BYTE_ORDER_DEFAULT TARGET_BYTE_ORDER
255 #ifndef TARGET_BYTE_ORDER_DEFAULT
256 #define TARGET_BYTE_ORDER_DEFAULT BIG_ENDIAN /* arbitrary */
258 /* ``target_byte_order'' is only used when non- multi-arch.
259 Multi-arch targets obtain the current byte order using
260 TARGET_BYTE_ORDER which is controlled by gdbarch.*. */
261 int target_byte_order = TARGET_BYTE_ORDER_DEFAULT;
262 int target_byte_order_auto = 1;
264 static const char endian_big[] = "big";
265 static const char endian_little[] = "little";
266 static const char endian_auto[] = "auto";
267 static const char *endian_enum[] =
274 static const char *set_endian_string;
276 /* Called by ``show endian''. */
279 show_endian (char *args, int from_tty)
281 if (TARGET_BYTE_ORDER_AUTO)
282 printf_unfiltered ("The target endianness is set automatically (currently %s endian)\n",
283 (TARGET_BYTE_ORDER == BIG_ENDIAN ? "big" : "little"));
285 printf_unfiltered ("The target is assumed to be %s endian\n",
286 (TARGET_BYTE_ORDER == BIG_ENDIAN ? "big" : "little"));
290 set_endian (char *ignore_args, int from_tty, struct cmd_list_element *c)
292 if (!TARGET_BYTE_ORDER_SELECTABLE_P)
294 printf_unfiltered ("Byte order is not selectable.");
296 else if (set_endian_string == endian_auto)
298 target_byte_order_auto = 1;
300 else if (set_endian_string == endian_little)
302 target_byte_order_auto = 0;
305 struct gdbarch_info info;
306 memset (&info, 0, sizeof info);
307 info.byte_order = LITTLE_ENDIAN;
308 if (! gdbarch_update_p (info))
310 printf_unfiltered ("Little endian target not supported by GDB\n");
315 target_byte_order = LITTLE_ENDIAN;
318 else if (set_endian_string == endian_big)
320 target_byte_order_auto = 0;
323 struct gdbarch_info info;
324 memset (&info, 0, sizeof info);
325 info.byte_order = BIG_ENDIAN;
326 if (! gdbarch_update_p (info))
328 printf_unfiltered ("Big endian target not supported by GDB\n");
333 target_byte_order = BIG_ENDIAN;
337 internal_error ("set_endian: bad value");
338 show_endian (NULL, from_tty);
341 /* Set the endianness from a BFD. */
344 set_endian_from_file (bfd *abfd)
347 internal_error ("set_endian_from_file: not for multi-arch");
348 if (TARGET_BYTE_ORDER_SELECTABLE_P)
352 if (bfd_big_endian (abfd))
355 want = LITTLE_ENDIAN;
356 if (TARGET_BYTE_ORDER_AUTO)
357 target_byte_order = want;
358 else if (TARGET_BYTE_ORDER != want)
359 warning ("%s endian file does not match %s endian target.",
360 want == BIG_ENDIAN ? "big" : "little",
361 TARGET_BYTE_ORDER == BIG_ENDIAN ? "big" : "little");
365 if (bfd_big_endian (abfd)
366 ? TARGET_BYTE_ORDER != BIG_ENDIAN
367 : TARGET_BYTE_ORDER == BIG_ENDIAN)
368 warning ("%s endian file does not match %s endian target.",
369 bfd_big_endian (abfd) ? "big" : "little",
370 TARGET_BYTE_ORDER == BIG_ENDIAN ? "big" : "little");
375 /* Functions to manipulate the architecture of the target */
377 enum set_arch { set_arch_auto, set_arch_manual };
379 int target_architecture_auto = 1;
381 const char *set_architecture_string;
383 /* Old way of changing the current architecture. */
385 extern const struct bfd_arch_info bfd_default_arch_struct;
386 const struct bfd_arch_info *target_architecture = &bfd_default_arch_struct;
387 int (*target_architecture_hook) (const struct bfd_arch_info *ap);
390 arch_ok (const struct bfd_arch_info *arch)
393 internal_error ("arch_ok: not multi-arched");
394 /* Should be performing the more basic check that the binary is
395 compatible with GDB. */
396 /* Check with the target that the architecture is valid. */
397 return (target_architecture_hook == NULL
398 || target_architecture_hook (arch));
402 set_arch (const struct bfd_arch_info *arch,
406 internal_error ("set_arch: not multi-arched");
411 warning ("Target may not support %s architecture",
412 arch->printable_name);
413 target_architecture = arch;
415 case set_arch_manual:
418 printf_unfiltered ("Target does not support `%s' architecture.\n",
419 arch->printable_name);
423 target_architecture_auto = 0;
424 target_architecture = arch;
429 gdbarch_dump (current_gdbarch, gdb_stdlog);
432 /* Set the architecture from arch/machine (deprecated) */
435 set_architecture_from_arch_mach (enum bfd_architecture arch,
438 const struct bfd_arch_info *wanted = bfd_lookup_arch (arch, mach);
440 internal_error ("set_architecture_from_arch_mach: not multi-arched");
442 set_arch (wanted, set_arch_manual);
444 internal_error ("gdbarch: hardwired architecture/machine not recognized");
447 /* Set the architecture from a BFD (deprecated) */
450 set_architecture_from_file (bfd *abfd)
452 const struct bfd_arch_info *wanted = bfd_get_arch_info (abfd);
454 internal_error ("set_architecture_from_file: not multi-arched");
455 if (target_architecture_auto)
457 set_arch (wanted, set_arch_auto);
459 else if (wanted != target_architecture)
461 warning ("%s architecture file may be incompatible with %s target.",
462 wanted->printable_name,
463 target_architecture->printable_name);
468 /* Called if the user enters ``show architecture'' without an
472 show_architecture (char *args, int from_tty)
475 arch = TARGET_ARCHITECTURE->printable_name;
476 if (target_architecture_auto)
477 printf_filtered ("The target architecture is set automatically (currently %s)\n", arch);
479 printf_filtered ("The target architecture is assumed to be %s\n", arch);
483 /* Called if the user enters ``set architecture'' with or without an
487 set_architecture (char *ignore_args, int from_tty, struct cmd_list_element *c)
489 if (strcmp (set_architecture_string, "auto") == 0)
491 target_architecture_auto = 1;
493 else if (GDB_MULTI_ARCH)
495 struct gdbarch_info info;
496 memset (&info, 0, sizeof info);
497 info.bfd_arch_info = bfd_scan_arch (set_architecture_string);
498 if (info.bfd_arch_info == NULL)
499 internal_error ("set_architecture: bfd_scan_arch failed");
500 if (gdbarch_update_p (info))
501 target_architecture_auto = 0;
503 printf_unfiltered ("Architecture `%s' not recognized.\n",
504 set_architecture_string);
508 const struct bfd_arch_info *arch
509 = bfd_scan_arch (set_architecture_string);
511 internal_error ("set_architecture: bfd_scan_arch failed");
512 set_arch (arch, set_arch_manual);
514 show_architecture (NULL, from_tty);
517 /* Called if the user enters ``info architecture'' without an argument. */
520 info_architecture (char *args, int from_tty)
522 printf_filtered ("Available architectures are:\n");
525 const char **arches = gdbarch_printable_names ();
527 for (arch = arches; *arch != NULL; arch++)
529 printf_filtered (" %s", *arch);
535 enum bfd_architecture a;
536 for (a = bfd_arch_obscure + 1; a < bfd_arch_last; a++)
538 const struct bfd_arch_info *ap;
539 for (ap = bfd_lookup_arch (a, 0);
543 printf_filtered (" %s", ap->printable_name);
548 printf_filtered ("\n");
551 /* Set the dynamic target-system-dependent parameters (architecture,
552 byte-order) using information found in the BFD */
555 set_gdbarch_from_file (bfd *abfd)
559 struct gdbarch_info info;
560 memset (&info, 0, sizeof info);
562 if (! gdbarch_update_p (info))
563 error ("Architecture of file not recognized.\n");
567 set_architecture_from_file (abfd);
568 set_endian_from_file (abfd);
572 /* Initialize the current architecture. Update the ``set
573 architecture'' command so that it specifies a list of valid
576 #ifdef DEFAULT_BFD_ARCH
577 extern const bfd_arch_info_type DEFAULT_BFD_ARCH;
578 static const bfd_arch_info_type *default_bfd_arch = &DEFAULT_BFD_ARCH;
580 static const bfd_arch_info_type *default_bfd_arch;
583 #ifdef DEFAULT_BFD_VEC
584 extern const bfd_target DEFAULT_BFD_VEC;
585 static const bfd_target *default_bfd_vec = &DEFAULT_BFD_VEC;
587 static const bfd_target *default_bfd_vec;
591 initialize_current_architecture (void)
593 const char **arches = gdbarch_printable_names ();
595 /* determine a default architecture and byte order. */
596 struct gdbarch_info info;
597 memset (&info, 0, sizeof (info));
599 /* Find a default architecture. */
600 if (info.bfd_arch_info == NULL
601 && default_bfd_arch != NULL)
602 info.bfd_arch_info = default_bfd_arch;
603 if (info.bfd_arch_info == NULL)
605 /* Choose the architecture by taking the first one
607 const char *chosen = arches[0];
609 for (arch = arches; *arch != NULL; arch++)
611 if (strcmp (*arch, chosen) < 0)
615 internal_error ("initialize_current_architecture: No arch");
616 info.bfd_arch_info = bfd_scan_arch (chosen);
617 if (info.bfd_arch_info == NULL)
618 internal_error ("initialize_current_architecture: Arch not found");
621 /* take several guesses at a byte order. */
622 /* NB: can't use TARGET_BYTE_ORDER_DEFAULT as its definition is
624 if (info.byte_order == 0
625 && default_bfd_vec != NULL)
627 /* Extract BFD's default vector's byte order. */
628 switch (default_bfd_vec->byteorder)
631 info.byte_order = BIG_ENDIAN;
633 case BFD_ENDIAN_LITTLE:
634 info.byte_order = LITTLE_ENDIAN;
640 if (info.byte_order == 0)
642 /* look for ``*el-*'' in the target name. */
644 chp = strchr (target_name, '-');
646 && chp - 2 >= target_name
647 && strncmp (chp - 2, "el", 2) == 0)
648 info.byte_order = LITTLE_ENDIAN;
650 if (info.byte_order == 0)
652 /* Wire it to big-endian!!! */
653 info.byte_order = BIG_ENDIAN;
658 if (! gdbarch_update_p (info))
660 internal_error ("initialize_current_architecture: Selection of initial architecture failed");
664 /* Create the ``set architecture'' command appending ``auto'' to the
665 list of architectures. */
667 struct cmd_list_element *c;
668 /* Append ``auto''. */
670 for (nr = 0; arches[nr] != NULL; nr++);
671 arches = xrealloc (arches, sizeof (char*) * (nr + 2));
672 arches[nr + 0] = "auto";
673 arches[nr + 1] = NULL;
674 /* FIXME: add_set_enum_cmd() uses an array of ``char *'' instead
675 of ``const char *''. We just happen to know that the casts are
677 c = add_set_enum_cmd ("architecture", class_support,
678 arches, &set_architecture_string,
679 "Set architecture of target.",
681 c->function.sfunc = set_architecture;
682 add_alias_cmd ("processor", "architecture", class_support, 1, &setlist);
683 /* Don't use set_from_show - need to print both auto/manual and
685 add_cmd ("architecture", class_support, show_architecture,
686 "Show the current target architecture", &showlist);
687 c = add_cmd ("architecture", class_support, info_architecture,
688 "List supported target architectures", &infolist);
689 deprecate_cmd (c, "set architecture");
696 extern initialize_file_ftype _initialize_gdbarch_utils;
699 _initialize_gdbarch_utils (void)
701 struct cmd_list_element *c;
702 c = add_set_enum_cmd ("endian", class_support,
703 endian_enum, &set_endian_string,
704 "Set endianness of target.",
706 c->function.sfunc = set_endian;
707 /* Don't use set_from_show - need to print both auto/manual and
709 add_cmd ("endian", class_support, show_endian,
710 "Show the current byte-order", &showlist);