1 /* Dynamic architecture support for GDB, the GNU debugger.
3 Copyright 1998, 1999, 2000, 2001, 2002, 2003, 2004 Free Software
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. */
25 #include "arch-utils.h"
28 #include "inferior.h" /* enum CALL_DUMMY_LOCATION et.al. */
29 #include "gdb_string.h"
31 #include "gdb_assert.h"
32 #include "sim-regno.h"
38 #include "floatformat.h"
40 /* Implementation of extract return value that grubs around in the
43 legacy_extract_return_value (struct type *type, struct regcache *regcache,
46 char *registers = deprecated_grub_regcache_for_registers (regcache);
47 bfd_byte *buf = valbuf;
48 DEPRECATED_EXTRACT_RETURN_VALUE (type, registers, buf); /* OK */
51 /* Implementation of store return value that grubs the register cache.
52 Takes a local copy of the buffer to avoid const problems. */
54 legacy_store_return_value (struct type *type, struct regcache *regcache,
57 bfd_byte *b = alloca (TYPE_LENGTH (type));
58 gdb_assert (regcache == current_regcache);
59 memcpy (b, buf, TYPE_LENGTH (type));
60 DEPRECATED_STORE_RETURN_VALUE (type, b);
64 always_use_struct_convention (int gcc_p, struct type *value_type)
69 enum return_value_convention
70 legacy_return_value (struct gdbarch *gdbarch, struct type *valtype,
71 struct regcache *regcache, void *readbuf,
74 /* NOTE: cagney/2004-06-13: The gcc_p parameter to
75 USE_STRUCT_CONVENTION isn't used. */
76 int struct_return = ((TYPE_CODE (valtype) == TYPE_CODE_STRUCT
77 || TYPE_CODE (valtype) == TYPE_CODE_UNION
78 || TYPE_CODE (valtype) == TYPE_CODE_ARRAY)
79 && DEPRECATED_USE_STRUCT_CONVENTION (0, valtype));
83 gdb_assert (!struct_return);
84 /* NOTE: cagney/2004-06-13: See stack.c:return_command. Old
85 architectures don't expect STORE_RETURN_VALUE to handle small
86 structures. Should not be called with such types. */
87 gdb_assert (TYPE_CODE (valtype) != TYPE_CODE_STRUCT
88 && TYPE_CODE (valtype) != TYPE_CODE_UNION);
89 STORE_RETURN_VALUE (valtype, regcache, writebuf);
94 gdb_assert (!struct_return);
95 EXTRACT_RETURN_VALUE (valtype, regcache, readbuf);
99 return RETURN_VALUE_STRUCT_CONVENTION;
101 return RETURN_VALUE_REGISTER_CONVENTION;
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_skip_trampoline_code (CORE_ADDR pc)
127 generic_skip_solib_resolver (struct gdbarch *gdbarch, CORE_ADDR pc)
133 generic_in_solib_return_trampoline (CORE_ADDR pc, char *name)
139 generic_in_function_epilogue_p (struct gdbarch *gdbarch, CORE_ADDR pc)
145 generic_remote_translate_xfer_address (struct gdbarch *gdbarch,
146 struct regcache *regcache,
147 CORE_ADDR gdb_addr, int gdb_len,
148 CORE_ADDR * rem_addr, int *rem_len)
150 *rem_addr = gdb_addr;
154 /* Helper functions for INNER_THAN */
157 core_addr_lessthan (CORE_ADDR lhs, CORE_ADDR rhs)
163 core_addr_greaterthan (CORE_ADDR lhs, CORE_ADDR rhs)
169 /* Helper functions for TARGET_{FLOAT,DOUBLE}_FORMAT */
171 const struct floatformat *
172 default_float_format (struct gdbarch *gdbarch)
174 int byte_order = gdbarch_byte_order (gdbarch);
178 return &floatformat_ieee_single_big;
179 case BFD_ENDIAN_LITTLE:
180 return &floatformat_ieee_single_little;
182 internal_error (__FILE__, __LINE__,
183 "default_float_format: bad byte order");
188 const struct floatformat *
189 default_double_format (struct gdbarch *gdbarch)
191 int byte_order = gdbarch_byte_order (gdbarch);
195 return &floatformat_ieee_double_big;
196 case BFD_ENDIAN_LITTLE:
197 return &floatformat_ieee_double_little;
199 internal_error (__FILE__, __LINE__,
200 "default_double_format: bad byte order");
204 /* Misc helper functions for targets. */
207 core_addr_identity (CORE_ADDR addr)
213 convert_from_func_ptr_addr_identity (struct gdbarch *gdbarch, CORE_ADDR addr,
214 struct target_ops *targ)
220 no_op_reg_to_regnum (int reg)
226 default_elf_make_msymbol_special (asymbol *sym, struct minimal_symbol *msym)
232 default_coff_make_msymbol_special (int val, struct minimal_symbol *msym)
238 cannot_register_not (int regnum)
243 /* Legacy version of target_virtual_frame_pointer(). Assumes that
244 there is an DEPRECATED_FP_REGNUM and that it is the same, cooked or
248 legacy_virtual_frame_pointer (CORE_ADDR pc,
250 LONGEST *frame_offset)
252 /* FIXME: cagney/2002-09-13: This code is used when identifying the
253 frame pointer of the current PC. It is assuming that a single
254 register and an offset can determine this. I think it should
255 instead generate a byte code expression as that would work better
256 with things like Dwarf2's CFI. */
257 if (DEPRECATED_FP_REGNUM >= 0 && DEPRECATED_FP_REGNUM < NUM_REGS)
258 *frame_regnum = DEPRECATED_FP_REGNUM;
259 else if (SP_REGNUM >= 0 && SP_REGNUM < NUM_REGS)
260 *frame_regnum = SP_REGNUM;
262 /* Should this be an internal error? I guess so, it is reflecting
263 an architectural limitation in the current design. */
264 internal_error (__FILE__, __LINE__, "No virtual frame pointer available");
268 /* Assume the world is sane, every register's virtual and real size
272 generic_register_size (int regnum)
274 gdb_assert (regnum >= 0 && regnum < NUM_REGS + NUM_PSEUDO_REGS);
275 return TYPE_LENGTH (gdbarch_register_type (current_gdbarch, regnum));
278 /* Assume all registers are adjacent. */
281 generic_register_byte (int regnum)
285 gdb_assert (regnum >= 0 && regnum < NUM_REGS + NUM_PSEUDO_REGS);
287 for (i = 0; i < regnum; i++)
289 byte += generic_register_size (i);
296 legacy_pc_in_sigtramp (CORE_ADDR pc, char *name)
298 #if defined (DEPRECATED_IN_SIGTRAMP)
299 return DEPRECATED_IN_SIGTRAMP (pc, name);
301 return name && strcmp ("_sigtramp", name) == 0;
306 generic_convert_register_p (int regnum, struct type *type)
312 default_stabs_argument_has_addr (struct gdbarch *gdbarch, struct type *type)
314 if (DEPRECATED_REG_STRUCT_HAS_ADDR_P ()
315 && DEPRECATED_REG_STRUCT_HAS_ADDR (processing_gcc_compilation, type))
317 CHECK_TYPEDEF (type);
319 return (TYPE_CODE (type) == TYPE_CODE_STRUCT
320 || TYPE_CODE (type) == TYPE_CODE_UNION
321 || TYPE_CODE (type) == TYPE_CODE_SET
322 || TYPE_CODE (type) == TYPE_CODE_BITSTRING);
329 /* Functions to manipulate the endianness of the target. */
331 /* ``target_byte_order'' is only used when non- multi-arch.
332 Multi-arch targets obtain the current byte order using the
333 TARGET_BYTE_ORDER gdbarch method.
335 The choice of initial value is entirely arbitrary. During startup,
336 the function initialize_current_architecture() updates this value
337 based on default byte-order information extracted from BFD. */
338 static int target_byte_order = BFD_ENDIAN_BIG;
339 static int target_byte_order_auto = 1;
342 selected_byte_order (void)
344 if (target_byte_order_auto)
345 return BFD_ENDIAN_UNKNOWN;
347 return target_byte_order;
350 static const char endian_big[] = "big";
351 static const char endian_little[] = "little";
352 static const char endian_auto[] = "auto";
353 static const char *endian_enum[] =
360 static const char *set_endian_string;
362 /* Called by ``show endian''. */
365 show_endian (char *args, int from_tty)
367 if (target_byte_order_auto)
368 printf_unfiltered ("The target endianness is set automatically (currently %s endian)\n",
369 (TARGET_BYTE_ORDER == BFD_ENDIAN_BIG ? "big" : "little"));
371 printf_unfiltered ("The target is assumed to be %s endian\n",
372 (TARGET_BYTE_ORDER == BFD_ENDIAN_BIG ? "big" : "little"));
376 set_endian (char *ignore_args, int from_tty, struct cmd_list_element *c)
378 if (set_endian_string == endian_auto)
380 target_byte_order_auto = 1;
382 else if (set_endian_string == endian_little)
384 struct gdbarch_info info;
385 target_byte_order_auto = 0;
386 gdbarch_info_init (&info);
387 info.byte_order = BFD_ENDIAN_LITTLE;
388 if (! gdbarch_update_p (info))
389 printf_unfiltered ("Little endian target not supported by GDB\n");
391 else if (set_endian_string == endian_big)
393 struct gdbarch_info info;
394 target_byte_order_auto = 0;
395 gdbarch_info_init (&info);
396 info.byte_order = BFD_ENDIAN_BIG;
397 if (! gdbarch_update_p (info))
398 printf_unfiltered ("Big endian target not supported by GDB\n");
401 internal_error (__FILE__, __LINE__,
402 "set_endian: bad value");
403 show_endian (NULL, from_tty);
406 /* Functions to manipulate the architecture of the target */
408 enum set_arch { set_arch_auto, set_arch_manual };
410 static int target_architecture_auto = 1;
412 static const char *set_architecture_string;
415 selected_architecture_name (void)
417 if (target_architecture_auto)
420 return set_architecture_string;
423 /* Called if the user enters ``show architecture'' without an
427 show_architecture (char *args, int from_tty)
430 arch = TARGET_ARCHITECTURE->printable_name;
431 if (target_architecture_auto)
432 printf_filtered ("The target architecture is set automatically (currently %s)\n", arch);
434 printf_filtered ("The target architecture is assumed to be %s\n", arch);
438 /* Called if the user enters ``set architecture'' with or without an
442 set_architecture (char *ignore_args, int from_tty, struct cmd_list_element *c)
444 if (strcmp (set_architecture_string, "auto") == 0)
446 target_architecture_auto = 1;
450 struct gdbarch_info info;
451 gdbarch_info_init (&info);
452 info.bfd_arch_info = bfd_scan_arch (set_architecture_string);
453 if (info.bfd_arch_info == NULL)
454 internal_error (__FILE__, __LINE__,
455 "set_architecture: bfd_scan_arch failed");
456 if (gdbarch_update_p (info))
457 target_architecture_auto = 0;
459 printf_unfiltered ("Architecture `%s' not recognized.\n",
460 set_architecture_string);
462 show_architecture (NULL, from_tty);
465 /* Try to select a global architecture that matches "info". Return
466 non-zero if the attempt succeds. */
468 gdbarch_update_p (struct gdbarch_info info)
470 struct gdbarch *new_gdbarch = gdbarch_find_by_info (info);
472 /* If there no architecture by that name, reject the request. */
473 if (new_gdbarch == NULL)
476 fprintf_unfiltered (gdb_stdlog, "gdbarch_update_p: "
477 "Architecture not found\n");
481 /* If it is the same old architecture, accept the request (but don't
483 if (new_gdbarch == current_gdbarch)
486 fprintf_unfiltered (gdb_stdlog, "gdbarch_update_p: "
487 "Architecture 0x%08lx (%s) unchanged\n",
489 gdbarch_bfd_arch_info (new_gdbarch)->printable_name);
493 /* It's a new architecture, swap it in. */
495 fprintf_unfiltered (gdb_stdlog, "gdbarch_update_p: "
496 "New architecture 0x%08lx (%s) selected\n",
498 gdbarch_bfd_arch_info (new_gdbarch)->printable_name);
499 deprecated_current_gdbarch_select_hack (new_gdbarch);
504 /* Return the architecture for ABFD. If no suitable architecture
505 could be find, return NULL. */
508 gdbarch_from_bfd (bfd *abfd)
510 struct gdbarch *old_gdbarch = current_gdbarch;
511 struct gdbarch *new_gdbarch;
512 struct gdbarch_info info;
514 gdbarch_info_init (&info);
516 return gdbarch_find_by_info (info);
519 /* Set the dynamic target-system-dependent parameters (architecture,
520 byte-order) using information found in the BFD */
523 set_gdbarch_from_file (bfd *abfd)
525 struct gdbarch *gdbarch;
527 gdbarch = gdbarch_from_bfd (abfd);
529 error ("Architecture of file not recognized.\n");
530 deprecated_current_gdbarch_select_hack (gdbarch);
533 /* Initialize the current architecture. Update the ``set
534 architecture'' command so that it specifies a list of valid
537 #ifdef DEFAULT_BFD_ARCH
538 extern const bfd_arch_info_type DEFAULT_BFD_ARCH;
539 static const bfd_arch_info_type *default_bfd_arch = &DEFAULT_BFD_ARCH;
541 static const bfd_arch_info_type *default_bfd_arch;
544 #ifdef DEFAULT_BFD_VEC
545 extern const bfd_target DEFAULT_BFD_VEC;
546 static const bfd_target *default_bfd_vec = &DEFAULT_BFD_VEC;
548 static const bfd_target *default_bfd_vec;
552 initialize_current_architecture (void)
554 const char **arches = gdbarch_printable_names ();
556 /* determine a default architecture and byte order. */
557 struct gdbarch_info info;
558 gdbarch_info_init (&info);
560 /* Find a default architecture. */
561 if (info.bfd_arch_info == NULL
562 && default_bfd_arch != NULL)
563 info.bfd_arch_info = default_bfd_arch;
564 if (info.bfd_arch_info == NULL)
566 /* Choose the architecture by taking the first one
568 const char *chosen = arches[0];
570 for (arch = arches; *arch != NULL; arch++)
572 if (strcmp (*arch, chosen) < 0)
576 internal_error (__FILE__, __LINE__,
577 "initialize_current_architecture: No arch");
578 info.bfd_arch_info = bfd_scan_arch (chosen);
579 if (info.bfd_arch_info == NULL)
580 internal_error (__FILE__, __LINE__,
581 "initialize_current_architecture: Arch not found");
584 /* Take several guesses at a byte order. */
585 if (info.byte_order == BFD_ENDIAN_UNKNOWN
586 && default_bfd_vec != NULL)
588 /* Extract BFD's default vector's byte order. */
589 switch (default_bfd_vec->byteorder)
592 info.byte_order = BFD_ENDIAN_BIG;
594 case BFD_ENDIAN_LITTLE:
595 info.byte_order = BFD_ENDIAN_LITTLE;
601 if (info.byte_order == BFD_ENDIAN_UNKNOWN)
603 /* look for ``*el-*'' in the target name. */
605 chp = strchr (target_name, '-');
607 && chp - 2 >= target_name
608 && strncmp (chp - 2, "el", 2) == 0)
609 info.byte_order = BFD_ENDIAN_LITTLE;
611 if (info.byte_order == BFD_ENDIAN_UNKNOWN)
613 /* Wire it to big-endian!!! */
614 info.byte_order = BFD_ENDIAN_BIG;
617 if (! gdbarch_update_p (info))
618 internal_error (__FILE__, __LINE__,
619 "initialize_current_architecture: Selection of initial architecture failed");
621 /* Create the ``set architecture'' command appending ``auto'' to the
622 list of architectures. */
624 struct cmd_list_element *c;
625 /* Append ``auto''. */
627 for (nr = 0; arches[nr] != NULL; nr++);
628 arches = xrealloc (arches, sizeof (char*) * (nr + 2));
629 arches[nr + 0] = "auto";
630 arches[nr + 1] = NULL;
631 /* FIXME: add_set_enum_cmd() uses an array of ``char *'' instead
632 of ``const char *''. We just happen to know that the casts are
634 c = add_set_enum_cmd ("architecture", class_support,
635 arches, &set_architecture_string,
636 "Set architecture of target.",
638 set_cmd_sfunc (c, set_architecture);
639 add_alias_cmd ("processor", "architecture", class_support, 1, &setlist);
640 /* Don't use set_from_show - need to print both auto/manual and
642 add_cmd ("architecture", class_support, show_architecture,
643 "Show the current target architecture", &showlist);
648 /* Initialize a gdbarch info to values that will be automatically
649 overridden. Note: Originally, this ``struct info'' was initialized
650 using memset(0). Unfortunately, that ran into problems, namely
651 BFD_ENDIAN_BIG is zero. An explicit initialization function that
652 can explicitly set each field to a well defined value is used. */
655 gdbarch_info_init (struct gdbarch_info *info)
657 memset (info, 0, sizeof (struct gdbarch_info));
658 info->byte_order = BFD_ENDIAN_UNKNOWN;
659 info->osabi = GDB_OSABI_UNINITIALIZED;
662 /* Similar to init, but this time fill in the blanks. Information is
663 obtained from the specified architecture, global "set ..." options,
664 and explicitly initialized INFO fields. */
667 gdbarch_info_fill (struct gdbarch *gdbarch, struct gdbarch_info *info)
669 /* "(gdb) set architecture ...". */
670 if (info->bfd_arch_info == NULL
671 && !target_architecture_auto
673 info->bfd_arch_info = gdbarch_bfd_arch_info (gdbarch);
674 if (info->bfd_arch_info == NULL
675 && info->abfd != NULL
676 && bfd_get_arch (info->abfd) != bfd_arch_unknown
677 && bfd_get_arch (info->abfd) != bfd_arch_obscure)
678 info->bfd_arch_info = bfd_get_arch_info (info->abfd);
679 if (info->bfd_arch_info == NULL
681 info->bfd_arch_info = gdbarch_bfd_arch_info (gdbarch);
683 /* "(gdb) set byte-order ...". */
684 if (info->byte_order == BFD_ENDIAN_UNKNOWN
685 && !target_byte_order_auto
687 info->byte_order = gdbarch_byte_order (gdbarch);
688 /* From the INFO struct. */
689 if (info->byte_order == BFD_ENDIAN_UNKNOWN
690 && info->abfd != NULL)
691 info->byte_order = (bfd_big_endian (info->abfd) ? BFD_ENDIAN_BIG
692 : bfd_little_endian (info->abfd) ? BFD_ENDIAN_LITTLE
693 : BFD_ENDIAN_UNKNOWN);
694 /* From the current target. */
695 if (info->byte_order == BFD_ENDIAN_UNKNOWN
697 info->byte_order = gdbarch_byte_order (gdbarch);
699 /* "(gdb) set osabi ...". Handled by gdbarch_lookup_osabi. */
700 if (info->osabi == GDB_OSABI_UNINITIALIZED)
701 info->osabi = gdbarch_lookup_osabi (info->abfd);
702 if (info->osabi == GDB_OSABI_UNINITIALIZED
704 info->osabi = gdbarch_osabi (gdbarch);
706 /* Must have at least filled in the architecture. */
707 gdb_assert (info->bfd_arch_info != NULL);
712 extern initialize_file_ftype _initialize_gdbarch_utils; /* -Wmissing-prototypes */
715 _initialize_gdbarch_utils (void)
717 struct cmd_list_element *c;
718 c = add_set_enum_cmd ("endian", class_support,
719 endian_enum, &set_endian_string,
720 "Set endianness of target.",
722 set_cmd_sfunc (c, set_endian);
723 /* Don't use set_from_show - need to print both auto/manual and
725 add_cmd ("endian", class_support, show_endian,
726 "Show the current byte-order", &showlist);