1 /* Builtin frame register, for GDB, the GNU debugger.
3 Copyright (C) 2002, 2005, 2007, 2008, 2009, 2010
4 Free Software Foundation, Inc.
6 Contributed by Red Hat.
8 This file is part of GDB.
10 This program is free software; you can redistribute it and/or modify
11 it under the terms of the GNU General Public License as published by
12 the Free Software Foundation; either version 3 of the License, or
13 (at your option) any later version.
15 This program is distributed in the hope that it will be useful,
16 but WITHOUT ANY WARRANTY; without even the implied warranty of
17 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 GNU General Public License for more details.
20 You should have received a copy of the GNU General Public License
21 along with this program. If not, see <http://www.gnu.org/licenses/>. */
24 #include "user-regs.h"
28 #include "gdb_string.h"
32 value_of_builtin_frame_fp_reg (struct frame_info
*frame
, const void *baton
)
34 struct gdbarch
*gdbarch
= get_frame_arch (frame
);
35 if (gdbarch_deprecated_fp_regnum (gdbarch
) >= 0)
36 /* NOTE: cagney/2003-04-24: Since the mere presence of "fp" in the
37 register name table overrides this built-in $fp register, there
38 is no real reason for this gdbarch_deprecated_fp_regnum trickery here.
39 An architecture wanting to implement "$fp" as alias for a raw
40 register can do so by adding "fp" to register name table (mind
41 you, doing this is probably a dangerous thing). */
42 return value_of_register (gdbarch_deprecated_fp_regnum (gdbarch
),
46 struct type
*data_ptr_type
= builtin_type (gdbarch
)->builtin_data_ptr
;
47 struct value
*val
= allocate_value (data_ptr_type
);
48 gdb_byte
*buf
= value_contents_raw (val
);
50 memset (buf
, 0, TYPE_LENGTH (value_type (val
)));
52 gdbarch_address_to_pointer (gdbarch
, data_ptr_type
,
53 buf
, get_frame_base_address (frame
));
59 value_of_builtin_frame_pc_reg (struct frame_info
*frame
, const void *baton
)
61 struct gdbarch
*gdbarch
= get_frame_arch (frame
);
62 if (gdbarch_pc_regnum (gdbarch
) >= 0)
63 return value_of_register (gdbarch_pc_regnum (gdbarch
), frame
);
66 struct type
*func_ptr_type
= builtin_type (gdbarch
)->builtin_func_ptr
;
67 struct value
*val
= allocate_value (func_ptr_type
);
68 gdb_byte
*buf
= value_contents_raw (val
);
70 memset (buf
, 0, TYPE_LENGTH (value_type (val
)));
72 gdbarch_address_to_pointer (gdbarch
, func_ptr_type
,
73 buf
, get_frame_pc (frame
));
79 value_of_builtin_frame_sp_reg (struct frame_info
*frame
, const void *baton
)
81 struct gdbarch
*gdbarch
= get_frame_arch (frame
);
82 if (gdbarch_sp_regnum (gdbarch
) >= 0)
83 return value_of_register (gdbarch_sp_regnum (gdbarch
), frame
);
84 error (_("Standard register ``$sp'' is not available for this target"));
88 value_of_builtin_frame_ps_reg (struct frame_info
*frame
, const void *baton
)
90 struct gdbarch
*gdbarch
= get_frame_arch (frame
);
91 if (gdbarch_ps_regnum (gdbarch
) >= 0)
92 return value_of_register (gdbarch_ps_regnum (gdbarch
), frame
);
93 error (_("Standard register ``$ps'' is not available for this target"));
96 extern initialize_file_ftype _initialize_frame_reg
; /* -Wmissing-prototypes */
99 _initialize_frame_reg (void)
101 /* Frame based $fp, $pc, $sp and $ps. These only come into play
102 when the target does not define its own version of these
104 user_reg_add_builtin ("fp", value_of_builtin_frame_fp_reg
, NULL
);
105 user_reg_add_builtin ("pc", value_of_builtin_frame_pc_reg
, NULL
);
106 user_reg_add_builtin ("sp", value_of_builtin_frame_sp_reg
, NULL
);
107 user_reg_add_builtin ("ps", value_of_builtin_frame_ps_reg
, NULL
);