1 /* Builtin frame register, for GDB, the GNU debugger.
3 Copyright 2002, 2005 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 2 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, write to the Free Software
21 Foundation, Inc., 59 Temple Place - Suite 330,
22 Boston, MA 02111-1307, USA. */
25 #include "user-regs.h"
29 #include "gdb_string.h"
31 /* Types that describe the various builtin registers. */
33 static struct type *builtin_type_frame_reg;
35 /* Constructors for those types. */
38 build_builtin_type_frame_reg (void)
41 if (builtin_type_frame_reg == NULL)
49 builtin_type_frame_reg = init_composite_type ("frame", TYPE_CODE_STRUCT);
50 append_composite_type_field (builtin_type_frame_reg, "base",
51 builtin_type_void_data_ptr);
56 value_of_builtin_frame_reg (struct frame_info *frame)
60 build_builtin_type_frame_reg ();
61 val = allocate_value (builtin_type_frame_reg);
62 VALUE_LVAL (val) = not_lval;
63 buf = value_contents_raw (val);
64 memset (buf, TYPE_LENGTH (value_type (val)), 0);
67 ADDRESS_TO_POINTER (builtin_type_void_data_ptr, buf,
68 get_frame_base (frame));
69 buf += TYPE_LENGTH (builtin_type_void_data_ptr);
75 value_of_builtin_frame_fp_reg (struct frame_info *frame)
77 if (DEPRECATED_FP_REGNUM >= 0)
78 /* NOTE: cagney/2003-04-24: Since the mere presence of "fp" in the
79 register name table overrides this built-in $fp register, there
80 is no real reason for this DEPRECATED_FP_REGNUM trickery here.
81 An architecture wanting to implement "$fp" as alias for a raw
82 register can do so by adding "fp" to register name table (mind
83 you, doing this is probably a dangerous thing). */
84 return value_of_register (DEPRECATED_FP_REGNUM, frame);
87 struct value *val = allocate_value (builtin_type_void_data_ptr);
88 char *buf = value_contents_raw (val);
90 memset (buf, TYPE_LENGTH (value_type (val)), 0);
92 ADDRESS_TO_POINTER (builtin_type_void_data_ptr, buf,
93 get_frame_base_address (frame));
99 value_of_builtin_frame_pc_reg (struct frame_info *frame)
102 return value_of_register (PC_REGNUM, frame);
105 struct value *val = allocate_value (builtin_type_void_data_ptr);
106 char *buf = value_contents_raw (val);
108 memset (buf, TYPE_LENGTH (value_type (val)), 0);
110 ADDRESS_TO_POINTER (builtin_type_void_data_ptr, buf,
111 get_frame_pc (frame));
116 static struct value *
117 value_of_builtin_frame_sp_reg (struct frame_info *frame)
121 return value_of_register (SP_REGNUM, frame);
123 error (_("Standard register ``$sp'' is not available for this target"));
126 static struct value *
127 value_of_builtin_frame_ps_reg (struct frame_info *frame)
131 return value_of_register (PS_REGNUM, frame);
133 error (_("Standard register ``$ps'' is not available for this target"));
136 extern initialize_file_ftype _initialize_frame_reg; /* -Wmissing-prototypes */
139 _initialize_frame_reg (void)
141 /* FIXME: cagney/2002-02-08: At present the local builtin types
142 can't be initialized using _initialize*() or gdbarch. Due mainly
143 to non-multi-arch targets, GDB initializes things piece meal and,
144 as a consequence can leave these types NULL. */
145 DEPRECATED_REGISTER_GDBARCH_SWAP (builtin_type_frame_reg);
147 /* Frame based $fp, $pc, $sp and $ps. These only come into play
148 when the target does not define its own version of these
150 user_reg_add_builtin ("fp", value_of_builtin_frame_fp_reg);
151 user_reg_add_builtin ("pc", value_of_builtin_frame_pc_reg);
152 user_reg_add_builtin ("sp", value_of_builtin_frame_sp_reg);
153 user_reg_add_builtin ("ps", value_of_builtin_frame_ps_reg);
155 /* NOTE: cagney/2002-04-05: For moment leave the $frame / $gdbframe
156 / $gdb.frame disabled. It isn't yet clear which of the many
157 options is the best. */
159 user_reg_add_builtin ("frame", value_of_builtin_frame_reg);