gdb/std-regs.c - gdb

Functions defined

Source code

  1. /* Builtin frame register, for GDB, the GNU debugger.

  3.    Copyright (C) 2002-2015 Free Software Foundation, Inc.

  5.    Contributed by Red Hat.

  7.    This file is part of GDB.

  9.    This program is free software; you can redistribute it and/or modify
  10.    it under the terms of the GNU General Public License as published by
  11.    the Free Software Foundation; either version 3 of the License, or
  12.    (at your option) any later version.

  14.    This program is distributed in the hope that it will be useful,
  15.    but WITHOUT ANY WARRANTY; without even the implied warranty of
  16.    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17.    GNU General Public License for more details.

  19.    You should have received a copy of the GNU General Public License
  20.    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */

  22. #include "defs.h"
  23. #include "user-regs.h"
  24. #include "frame.h"
  25. #include "gdbtypes.h"
  26. #include "value.h"
  27. static struct value *
  28. ‌value_of_builtin_frame_fp_reg (struct frame_info *frame, const void *baton)
  29. {
  30.   struct gdbarch *gdbarch = get_frame_arch (frame);

  32.   if (gdbarch_deprecated_fp_regnum (gdbarch) >= 0)
  33.     /* NOTE: cagney/2003-04-24: Since the mere presence of "fp" in the
  34.        register name table overrides this built-in $fp register, there
  35.        is no real reason for this gdbarch_deprecated_fp_regnum trickery here.
  36.        An architecture wanting to implement "$fp" as alias for a raw
  37.        register can do so by adding "fp" to register name table (mind
  38.        you, doing this is probably a dangerous thing).  */
  39.     return value_of_register (gdbarch_deprecated_fp_regnum (gdbarch),
  40.                               frame);
  41.   else
  42.     {
  43.       struct type *data_ptr_type = builtin_type (gdbarch)->builtin_data_ptr;
  44.       struct value *val = allocate_value (data_ptr_type);
  45.       gdb_byte *buf = value_contents_raw (val);

  47.       gdbarch_address_to_pointer (gdbarch, data_ptr_type,
  48.                                   buf, get_frame_base_address (frame));
  49.       return val;
  50.     }
  51. }

  53. static struct value *
  54. ‌value_of_builtin_frame_pc_reg (struct frame_info *frame, const void *baton)
  55. {
  56.   struct gdbarch *gdbarch = get_frame_arch (frame);

  58.   if (gdbarch_pc_regnum (gdbarch) >= 0)
  59.     return value_of_register (gdbarch_pc_regnum (gdbarch), frame);
  60.   else
  61.     {
  62.       struct type *func_ptr_type = builtin_type (gdbarch)->builtin_func_ptr;
  63.       struct value *val = allocate_value (func_ptr_type);
  64.       gdb_byte *buf = value_contents_raw (val);

  66.       gdbarch_address_to_pointer (gdbarch, func_ptr_type,
  67.                                   buf, get_frame_pc (frame));
  68.       return val;
  69.     }
  70. }

  72. static struct value *
  73. ‌value_of_builtin_frame_sp_reg (struct frame_info *frame, const void *baton)
  74. {
  75.   struct gdbarch *gdbarch = get_frame_arch (frame);

  77.   if (gdbarch_sp_regnum (gdbarch) >= 0)
  78.     return value_of_register (gdbarch_sp_regnum (gdbarch), frame);
  79.   error (_("Standard register ``$sp'' is not available for this target"));
  80. }

  82. static struct value *
  83. ‌value_of_builtin_frame_ps_reg (struct frame_info *frame, const void *baton)
  84. {
  85.   struct gdbarch *gdbarch = get_frame_arch (frame);

  87.   if (gdbarch_ps_regnum (gdbarch) >= 0)
  88.     return value_of_register (gdbarch_ps_regnum (gdbarch), frame);
  89.   error (_("Standard register ``$ps'' is not available for this target"));
  90. }

  92. extern initialize_file_ftype _initialize_frame_reg; /* -Wmissing-prototypes */

  94. void
  95. ‌_initialize_frame_reg (void)
  96. {
  97.   /* Frame based $fp, $pc, $sp and $ps.  These only come into play
  98.      when the target does not define its own version of these
  99.      registers.  */
  100.   user_reg_add_builtin ("fp", value_of_builtin_frame_fp_reg, NULL);
  101.   user_reg_add_builtin ("pc", value_of_builtin_frame_pc_reg, NULL);
  102.   user_reg_add_builtin ("sp", value_of_builtin_frame_sp_reg, NULL);
  103.   user_reg_add_builtin ("ps", value_of_builtin_frame_ps_reg, NULL);
  104. }